TEC Zoning Control System for Stand-Alone and

Transcription

BACnet® MS/TP Networked Applications
Technical Bulletin
Code No. LIT-12011682
Issued May 13, 2011
TEC2647Z-3, TEC2647Z-3+PIR,
TEC2664Z-3
Refer to the QuickLIT Web site for the most up-to-date version of this document.
Document Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Related Documentation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
System Overview and Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Initial Design Criteria Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Scalability and Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Local Zone Terminal Reheat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Exception Areas. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Bypass Damper Design Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Setup and Adjustments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
TEC2647Z-3 and TEC2647Z-3+PIR Zone Controller Operation Overview . . . . . . . . . . 11
Zone Controller User Interface Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Backlit LCD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Light-Emitting Diodes (LEDs). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Passive Infrared (PIR) Onboard Occupancy Sensor (TEC2647Z-3+PIR Model) . . . . . . . . 12
Status Display Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
PIR Onboard Occupancy Sensor Operation (TEC2647Z-3+PIR Model) . . . . . . . . . . . . . . . 13
PIR Diagnostic LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Standby Setpoints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
TEC2664Z-3 Rooftop Controller Operation Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Rooftop Controller User Interface Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Light-Emitting Diodes (LEDs). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Manual Scroll Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Main User Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Configuring the TEC2647Z-3 or TEC2647Z-3+PIR Zone Controller. . . . . . . . . . . . . . . . 16
TEC Zoning Control System for Stand-Alone and BACnet® MS/TP Networked
Applications Technical Bulletin
1
Monitoring Inputs BI2 and UI3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
TEC2647Z-3 and TEC2647Z-3+PIR Zone Controller Operation and Strategy. . . . . . . . 22
PIR Onboard Occupancy Sensor (TEC2647Z-3+PIR Model) . . . . . . . . . . . . . . . . . . . . . . . 23
Demand-Based Heating and Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Overrides and Zone Controller User Interface Lockouts . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Zone Setpoint Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Heating and Cooling Weight Zone Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Minimum, Maximum, and Heat Flow Adjustments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Minimum Position Adjustment (Min Pos Parameter) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Maximum Position Adjustment (Max Pos Parameter) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Maximum Heat Flow Adjustment (MaxHTPos Parameter) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Balancing the Minimum, Maximum, and Heat Flow Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Terminal Reheat Lockout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Configuring the TEC2664Z-3 Rooftop Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Configuring Input DI1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
TEC2664Z-3 Rooftop Controller Operation and Strategy. . . . . . . . . . . . . . . . . . . . . . . . 37
Data Exchange Between the Rooftop Controller and the Zones . . . . . . . . . . . . . . . . . . . . . 38
Occupancy and Overrides . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Rooftop Controller User Interface Lockouts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Rooftop Controller Heating and Cooling Supply Air Temperature Lockouts . . . . . . . . . . . . 39
Rooftop Controller Heating and Cooling Outside Air Temperature Lockouts . . . . . . . . . . . 40
Seasonal Changeover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Bypass Damper Control and Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
TEC2647Z-3 and TEC2647Z-3+PIR Zone Controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
PIR Occupancy Sensor Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
PIR Occupancy Sensor Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
TEC2664Z-3 Rooftop Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
TEC2664Z-3 Rooftop Controller Operation and Strategy . . . . . . . . . . . . . . . . . . . . 50
Main User Menu Access Modifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Sequence of Auto Status Display Scrolling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
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TEC Zoning Control System for Stand-Alone and BACnet® MS/TP Networked Applications
Technical Bulletin
Sequence of Manual Status Display Scrolling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Sequence of Operation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
System Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Proper Commissioning of the Zone Controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Proper Commissioning of the Rooftop Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
System Operation Checklists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
MS/TP Bus Objects When Networked with a Supervisory Controller. . . . . . . . . . . 61
TEC2647Z-3 and TEC2647Z-3+PIR Zone Controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
TEC2664Z-3 Rooftop Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
MS/TP Device Mapping into an NAE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Adding a Zone Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Adding a Rooftop Controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Adding Point Objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Notes, Tips, and Things to Know . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Multiple 24 VAC Zone Controller Transformers versus a Single 24 VAC Zone Controller
Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Critical Point Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Balancing and Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Occupancy Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Occupancy Schedule. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
NAE Engineering View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Troubleshooting a TEC Zoning Control System . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Technical Bulletin
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Technical Bulletin
BACnet® MS/TP Networked Applications
Technical Bulletin
Document Introduction
This document describes how to configure and commission a TEC Zoning Control
System for stand-alone and BACnet® Master-Slave/Token-Passing (MS/TP)
networked applications, including how to:
•
map devices into a Network Automation Engine (NAE)
•
add a zone controller and rooftop controller on a Metasys® network
•
map the required zone controller and rooftop controller point objects
•
operate the zone controller and rooftop controller user interface keys
•
configure the zone controller and rooftop controller parameters via the Installer
Configuration Menu
•
determine the sequence of operation of the zones
•
initiate the rooftop controller Main User Menu
•
determine the rooftop controller sequence of auto status display scrolling
•
initiate the rooftop controller manual scroll display
•
troubleshoot a TEC Zoning Control System
This document neither describes how to locate or install the TEC Zoning Control
System, nor how to wire the system. Refer to the appropriate zone controller and
rooftop controller installation instructions listed in Table 1 for more information on
these topics.
Related Documentation
See Table 1 for related documentation.
Table 1: TEC Zoning Control System Related Documentation (Part 1 of 2)
For Information On
See Document
LIT or Part Number
Applications, Features, and Benefits of
the TEC Zoning Control System
TEC Zoning Control System for
Stand-Alone and BACnet MS/TP
Networked Applications Product Bulletin
LIT-12011681
Locating, Mounting, and Wiring
TEC2647Z-3 and TEC2647Z-3+PIR Zone
Controllers
TEC2647Z-3 and TEC2647Z-3+PIR
BACnet MS/TP Zone Controllers for
Stand-Alone and Networked Zoning
Systems Installation Instructions
Part No. 24-9890-1370
Locating, Mounting, and Wiring
TEC2664Z-3 Rooftop Controllers
TEC2664Z-3 BACnet MS/TP Rooftop
Controller for Stand-Alone and Networked
Zoning Systems Installation Instructions
Part No. 24-9890-1362
Mounting and Wiring a TEC-7-PIR
Occupancy Sensor Zone Controller
Cover
Passive Infrared (PIR) Accessory Covers
Installation Instructions
Part No. 24-9890-870
Technical Bulletin
5
Table 1: TEC Zoning Control System Related Documentation (Part 2 of 2)
For Information On
See Document
LIT or Part Number
Particular Options Specified in the
BACnet Standard and Implemented in
the TEC2647Z-3 or TEC2647Z-3+PIR
Zone Controller
Zoning System TEC2647Z-3 and
TEC2647Z-3+PIR Zone Controllers
Protocol Implementation Conformance
Statement Technical Bulletin
LIT-12011683
Particular Options Specified in the
BACnet Standard and Implemented in
the TEC2664Z-3 Rooftop Controller
Zoning System TEC2664Z-3 Rooftop
Controller Protocol Implementation
Conformance Statement Technical Bulletin
LIT-12011684
Product Overview
IMPORTANT: The TEC Zoning Control System is intended to provide an
input to equipment under normal operating conditions. Where failure or
malfunction of the zoning control system could lead to personal injury or
property damage to the controlled equipment or other property, additional
precautions must be designed into the zoning control system. Incorporate and
maintain other devices, such as supervisory or alarm systems or safety or limit
controls, intended to warn of or protect against failure or malfunction of the
zoning control system.
The TEC Zoning Control System features a fully scalable network architecture
using BACnet MS/TP communication capability that operates with a supervisory
controller, or it can operate as a stand-alone system. This cost-effective zoning
control system provides efficient space temperature control for constant volume,
pressure-dependent systems in multi-zone heating and cooling applications.
The TEC Zoning Control System uses standard BACnet objects for automatic,
self-binding zone-controller-to-rooftop-controller configuration, communicating
in a peer-to-peer manner. Pre-configured sequences reduce the need for
programming and eliminate flash downloading. Plain text menus, backlit display,
and multiple interface keys make setup and operation quick and easy.
Figure 1 illustrates a typical TEC Zoning Control System installed on a
single MS/TP Bus. This installation consists of multiple TEC2647Z-3 or
TEC2647Z-3+PIR (onboard occupancy sensor) Zone Controllers, each controlling
a single zone damper; and a TEC2664Z-3 Rooftop Controller controlling a rooftop
unit. Optionally, the MS/TP Bus can be wired to a supervisory controller to
provide centralized monitoring and control of the system.
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Technical Bulletin
Figure 1: Typical TEC Zoning Control System Installed on a Single MS/TP Bus
System Overview and Architecture
The TEC Zoning Control System is comprised of two terminal equipment
controller types, including:
•
TEC2647Z-3 or TEC2647Z-3+PIR Zone Controller
•
TEC2664Z-3 Rooftop Controller
Combined, this system delivers a simple yet efficient way to operate and control
pressure-dependent Variable Air Volume (VAV) zones with rooftop units.
System control implementation is based on demand. The system is designed to
work with small- to medium-sized staged heating and cooling rooftop unit
equipment (2 to 20 tons typical).
A local BACnet MS/TP Bus between all devices provides effective
communication and smooth data exchange of all required information between the
zone controllers and the rooftop controllers for proper system operation.
Integration into any BACnet supervision system is seamless.
The zone controller and rooftop controller feature a backlit Liquid Crystal Display
(LCD) with dedicated function menu buttons for simple user operation. Accurate
temperature control is achieved through a unique, Proportional-Integral (PI)
time-proportioning algorithm that virtually eliminates temperature offset
associated with traditional, differential-based thermostats.
The zone controller is specifically designed for local pressure-dependent VAV
zone control within Johnson Controls® zoning system product family. The
primary damper output uses an off-the-shelf, standard 0 to 10 VDC VAV actuator
for control.
Technical Bulletin
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The zone controller is available with or without a factory-installed occupancy
sensor cover. The zone controller is also compatible with an accessory
Johnson Controls TEC-7-PIR Occupancy Sensor Cover. A zone controller
equipped with the occupancy sensor cover provides advanced active occupancy
logic that automatically switches occupancy levels from occupied to standby as
required, when motion is sensed. This feature results in incremental energy savings
during scheduled occupied periods when the space is unoccupied, without
sacrificing occupant comfort.
The rooftop controller is specifically designed for equipment control, based on the
demands of the zone. The rooftop controller provides single- or multi-stage control
of heating and cooling equipment, such as rooftop and self-contained units used in
zoning control systems. The rooftop controller includes an extra digital input that
monitors filter status or as a general-purpose service indicator. A Single-Pole,
Single-Throw (SPST) auxiliary contact controls lighting or disables the rooftop
controller economizer function during unoccupied periods. Also included is a
discharge air sensor input. Proportional input and output static pressure logic is
integrated into the rooftop controller design, to provide bypass damper control.
The TEC Zoning Control System requires a minimum of a single zone controller
and a single rooftop controller to operate properly. A typical application includes
multiple zone controllers addressed to a single rooftop controller.
The following is required for proper zone controller operation, and must be
provided separately:
•
24 VAC power supply, dedicated to the zone(s)
•
analog 0 to 10 VDC pressure-dependent electric actuator
•
terminal reheat (if required by the design)
•
proper wiring of all components, per the installation instructions
•
proper network wires fed for each device
The following is required for proper rooftop controller operation, and must be
provided separately:
8
•
24 VAC power supply, typically taken directly from the rooftop unit power
supply (C and RC)
•
outdoor air sensor
•
supply air duct sensor
•
return air duct sensor
•
0 to 5 VDC static pressure sensor/transducer
•
analog 0 to 10 VDC bypass damper actuator (spring return or non-spring
return)
•
proper wiring of all components, per the installation instructions
•
proper network wiring
Technical Bulletin
As an example of network configuration, a typical installation may include three
rooftop controllers, controlling 28 zones, for a total of 31 nodes (individual Comm
addresses). One rooftop controller would have 9 zones under its command, another
rooftop controller would also have 9 zones under its command, and a third rooftop
controller would have 10 zones under its command.
Initial Design Criteria Considerations
The designer and installer of the TEC Zoning Control System must:
•
size the installed equipment for the properly calculated heating and cooling
peak loads. Oversizing the installed capacity more than what is required is not
advantageous, as it simply leads to short cycling of the equipment during small
load periods.
•
properly size and lay out the duct work (including the bypass damper) in
accordance with local, national, and regional regulations.
IMPORTANT: The TEC Zoning Control System is a low static pressure
system. Design its application in your HVAC system so that potential failure of
the bypass damper subsystem does not cause failure of the ducts.
•
properly size the capacity of the zone versus its true requirements. Square
footage calculations can cause the installed total deliverable load to be
insufficient for the actual use of an area (for example, a conference room,
computer room, or a cafeteria).
Although the TEC Zoning Control System does not correct for a wrong initial
mechanical layout and associated load calculations, the control system does
dramatically help deliver the load required by voting zones. The control system
accomplishes the delivery by appropriately distributing the total available capacity
of the installed equipment to the required voting zones. If the equipment is
undersized for the peak load, the control system distributes the available capacity
according to the priorities requested, to improve the comfort level of the majority
of zones.
Proper planning and design plays a critical role in getting an installation up and
running faster, and with fewer service calls during the initial occupancy period.
Scalability and Limitations
The TEC Zoning Control System is fully scalable in terms of the number of zone
controllers and rooftop controllers used on the same MS/TP Communications Bus.
For more details on wiring to the MS/TP Bus, refer to the MS/TP Communications
Bus Technical Bulletin (LIT-12011034).
Technical Bulletin
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Local Zone Terminal Reheat
The need for terminal reheat depends on the specific application. As a general rule,
including terminal reheat in a VAV system always results in better occupancy
comfort; however, it may not be practical from a cost standpoint or for regional
load requirements. System designs vary widely from north to south and east to
west because of regional peak load requirements.
In colder climates, VAV system heating operation without terminal reheat typically
results in colder walls on the outer perimeter of the zone. Although the dry bulb
temperature of the zone is well maintained, occupants may be uncomfortable
simply because of the lower outer wall temperature. In addition, heating delivery
from the ceiling in outside zones is not as efficient as heating delivery directly
where the losses occur, such as when a perimeter electric baseboard or a perimeter
hydronic baseboard is used.
In regions where the heating load is low and only required for a short period of the
year, a properly sized VAV system can deliver the required heating comfort
without the use of terminal reheat. Ideally, the design of the ductwork and area
diffusers should be the most efficient arrangement possible, with the heating
delivery concentrated close to the outer walls of the zone.
In problematic situations where efficient heating delivery is an issue, fan powered
VAV systems can reduce occupancy discomfort by providing a constant flow to the
zones, to maximize heating delivery.
Exception Areas
An office installation typically requires that a single VAV system service multiple
areas or zones. These areas are likely a mix of internal and external zones. Verify
the requirements of each zone to determine a true total peak load before
committing to a final VAV system design and size.
It may be necessary to intentionally oversize or undersize the VAV system to meet
the daily load demands. The following are examples where oversizing may be
required:
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•
areas with large windows that are exposed to the sun for long periods of time
•
conference rooms
•
cafeterias
•
areas with vending machines
•
areas with extra lighting
•
areas with computers, photocopiers, and other electronic office equipment
Technical Bulletin
Areas such as computer rooms, kitchens, or large meeting rooms may require an
independent VAV system, and should not be included with other zones that are
networked to the rooftop controller. Certain critical areas may call for cooling all
year long and, based on the VAV system settings, could provide proper occupancy
comfort for only a portion of the year. Knowing in advance the critical areas of the
building, and designing for these zones appropriately, results in a more
comfortable environment for all building occupants.
Bypass Damper Design Rules
A bypass damper is an airflow regulating device installed between the supply and
return air ducts. The bypass damper automatically opens and bypasses the supply
air normally delivered to the zone, directly from the supply to the return, as a result
of a pressure rise when the VAV zone dampers close. The bypass damper is
normally sized to pass at least 70 to 80% of the nominal airflow of the rooftop
controller.
To determine if the bypass damper is sized properly, assume that all VAV zone
dampers are closed to the minimum position. The bypass damper should be large
enough to recirculate all of the airflow from the rooftop controller, minus the
airflow set by the minimum positions at the zones.
Setup and Adjustments
TEC2647Z-3 and TEC2647Z-3+PIR Zone Controller Operation
Overview
PIR motion detector
saves energy using
stand-by setpoints.
Room Temp
70.0ºF
LEDs indicate
system activity.
Three keys on the zone controller
make operation easy and intuitive.
FIG:tec2647z_2_frnt_vw
Backlit, plain text
LCD is easy to read
in any condition.
Figure 2: Front Cover of Zone Controller
(TEC2647Z-3+PIR Model Shown)
Technical Bulletin
11
Zone Controller User Interface Keys
The zone controller user interface is comprised of three keys on the front cover (as
illustrated in Figure 2). The function of each key is as follows:
•
OVERRIDE key overrides the unoccupied mode to occupied at the local user
interface for the specified TOccTime. (Define TOccTime by selecting the
appropriate time period in the Installer Configuration Menu.)
Note: If the Lockout parameter is set to (2): Level 3 or (3): Level 4, then this
OVERRIDE key is disabled.
The OVERRIDE key also allows access to the Installer Configuration Menu.
See Configuring the TEC2647Z-3 or TEC2647Z-3+PIR Zone Controller on
page 16.
•
UP/DOWN arrow keys change the configuration parameters and activate a
setpoint adjustment.
Backlit LCD
The zone controller includes a two-line, eight-character backlit display. Low-level
backlighting is present during normal operation and brightens when any user
interface key is pressed. The backlight returns to low level when the zone
controller is left unattended for 45 seconds.
Light-Emitting Diodes (LEDs)
Two LEDs are included to show a call for heating or a call for cooling:
•
The
LED is on when heating or reheat is on.
•
The
LED is on when cooling is on.
Passive Infrared (PIR) Onboard Occupancy Sensor (TEC2647Z-3+PIR Model)
The PIR onboard occupancy sensor allows for automatic switching between fully
adjustable occupied and standby temperature setpoints without user interaction.
This feature results in incremental energy savings during scheduled occupied
periods when the space is unoccupied.
Status Display Menu
The Status Display Menu appears during normal zone controller operation. This
menu continuously scrolls through the following parameters:
12
•
Room Temperature
•
Occupancy Status
(Occupied/Unoccupied/Standby/Override)
Technical Bulletin
•
Outside Temperature (Installation of an outside air temperature sensor allows
the H lock and C lock parameters of the rooftop controller to discontinue
heating or cooling operation in response to the outside air temperature. If an
outside air temperature sensor is not installed, an ambiguous outside air
temperature appears on the zone controller display unless its MenuScro
parameter is set to off.)
Note: An option is available within the Installer Configuration Menu to lock out
the scrolling display and show only the Room Temperature parameter.
PIR Onboard Occupancy Sensor Operation (TEC2647Z-3+PIR Model)
The zone controller provides advanced occupancy logic when equipped with a
PIR occupancy sensor cover or a remote PIR occupancy sensor attached to BI1.
Note: Set the PIR Func parameter to on as described in Table 2 to enable the
PIR occupancy sensing function.
The zone controller automatically switches occupancy levels from standby to
occupied as required, when local motion is sensed.
Occupancy sensing is enabled only if a PIR occupancy sensor cover is installed on
the zone controller, or if a remote input is configured as a remote PIR occupancy
sensor (MotionNO or MotionNC) and the PIR Func parameter is set to on as
described in Table 2.
PIR Diagnostic LEDs
The diagnostic LEDs within the zone controller brighten when motion is detected
within the first 30 minutes after the unit is powered up. The diagnostic LEDs do
not light up or brighten after the initial 30-minute powerup period.
Standby Setpoints
The standby setpoints have the same limitations and restrictions as the occupied
and unoccupied setpoints. The standby setpoints reside between the corresponding
occupied and unoccupied setpoint values.
Technical Bulletin
13
TEC2664Z-3 Rooftop Controller Operation Overview
Figure 3: Front Cover of Rooftop Controller
Rooftop Controller User Interface Keys
The TEC2664Z-3 Rooftop Controller user interface consists of five keys on the
front cover (as illustrated in Figure 3). The function of each key is as follows:
•
Use the YES/SCROLL key to:
-
confirm display selections and to advance to the next display item
-
stop the Auto Scroll Display from automatically scrolling and to manually
scroll to the next parameter on the display
Note: When the rooftop controller is left unattended for 45 seconds, the
rooftop controller display resumes scrolling.
•
Use the NO key to decline a parameter change and to advance to the next
display item.
•
Use the MENU key to:
•
14
-
access the Main User Menu or to exit the menu (See Main User Menu on
page 15.)
-
access the Installer Configuration Menu or to exit the menu (See
Configuring the TEC2664Z-3 Rooftop Controller on page 33.)
Use the UP/DOWN arrow keys to change the configuration parameters and to
activate a setpoint adjustment.
Technical Bulletin
Light-Emitting Diodes (LEDs)
Three LEDs are included to indicate the fan status, and to show a call for heating
or a call for cooling:
•
The
LED is on when the fan is on.
•
The
LED is on when heating is on.
•
The
LED is on when cooling is on.
Manual Scroll Display
To initiate the Manual Scroll Display, press the YES key repeatedly. The last item
viewed remains on the display for 30 seconds before Auto Scroll Display resumes.
The manual scroll sequence is as follows:
•
Clock Status (Day/Time)
•
System Mode (Off/Auto)
•
Schedule Status (Occupied/Unoccupied/Override)
•
Outside Temperature
•
Alarms (Service/DAS Alrm/SetClock/Filter/Comm Lost)
•
Current Zone Sequence (Off/Cool/Heat)
•
Return Air Temp
•
Discharge Air Temp
•
Current Static Pressure
•
Effective PI Heat
•
Effective PI Cool
•
Highest PI Heat Zone
•
Highest PI Cool Zone
Main User Menu
Use the Main User Menu to access and change the basic operating parameters of
the rooftop controller. During normal rooftop controller operation, press the
MENU key once to access the Main User Menu. This menu is most commonly
used by the zone occupant and includes the following parameters:
•
Schedule Override/Cancel Override
•
System Mode
•
Set Schedule
•
Set Clock
Technical Bulletin
15
The Main User Menu uses Auto Help. Auto Help appears automatically in the
Main User Menu when programming activity pauses.
Configuring the TEC2647Z-3 or TEC2647Z-3+PIR Zone Controller
The zone controller ships from the factory with default settings for all configurable
parameters. The default settings are shown in Table 2. Access the Installer
Configuration Menu on the zone controller to reconfigure the parameters.
1. Press and hold the OVERRIDE key for approximately 8 seconds to access the
Installer Configuration Menu.
2. Once the Installer Configuration Menu begins, release and press the
OVERRIDE key to scroll through the parameters listed in Table 2.
3. When the desired parameter appears, use the UP/DOWN arrow keys to choose
the desired selection option.
4. Press and release the OVERRIDE key to continue scrolling through the
parameters.
When the zone controller is in the Installer Configuration Menu and left
unattended for approximately 8 seconds, the zone controller reverts to the Status
Display Menu.
Monitoring Inputs BI2 and UI3
BI2 provides voltage-free contact status via the supervisory controller only.
Examples of monitoring include airflow proving and filter status.
The UI3 input provides temperature sensor monitoring via the supervisory
controller.
Table 2: TEC2647Z-3 and TEC2647Z-3+PIR Zone Controller Installer
Configuration Menu (Part 1 of 7)
Parameter
Appearing
on Display
Description and Default
Selection Options
Zone MAC1
Sets a unique device address for
the zone controller on the MS/TP
network.
Default: 255
Range: 004 to 127
Note: When setting the device address, press the UP/DOWN arrow
keys to change the device address in increments of 1; press
and hold the UP/DOWN arrow keys to change the device
address in increments of 10.
ZoneBaud
Sets the baud rate of the zone
controller on the MS/TP network.
Default: Auto
(9600): 9600 bps
(19200): 19,200 bps
(38400): 38,400 bps
(76800): 76,800 bps
(Auto): Auto Baud
16
Technical Bulletin
Parameter
Appearing
on Display
Selection Options
Get From
Gets all of the installer configuration
menu parameter values except
Zone MAC, ZoneBaud, RTC MAC,
and Cal RS of another zone
controller. Also copies the GUI
Occupied Heat Spt, GUI Occupied
Cool Spt, and Cfg Network Handle
MS/TP Bus objects.
Default: 255
Note: This parameter requires
that the device is
communicating on the
MS/TP Bus. If the device is
communicating on the
MS/TP Bus, the Installer
Configuration Menu does not
scroll past this parameter.
Range: 001 to 255
Note: Entering a zone controller address begins a routine to get the
parameter values of that zone controller, and imports those
values to the zone controller from which the Get From
parameter is being set. After getting the parameters, this
value reverts back to 255. When getting the parameter value,
press the UP/DOWN arrow keys to change the device
address in increments of 1; press and hold the UP/DOWN
arrow keys to change the device address in increments
of 10.
RTC MAC2
the rooftop controller to which the
zone controller communicates.
Default: 4
Note: All zone controllers
associated with the same
rooftop controller must have
the same RTC MAC
parameter setting as the
rooftop controller.
Range: 004 to 127
MenuScro
Gives the option of having the
display continuously scroll the
parameters.
Note: If an outside air temperature
sensor is not installed at the
rooftop controller, set the
MenuScro parameter of the
zone controller to off to
prevent an ambiguous
outside air temperature from
displaying.
Default: on
(off): The scroll is inactive.
(on): The scroll is active.
C or F
Provides temperature scale options
for display.
Default: °F
(°C): Celsius Scale
(°F): Fahrenheit Scale
Technical Bulletin
17
Parameter
Appearing
on Display
Selection Options
PIR Func3
Enables the PIR onboard
occupancy sensor.
Default: off
Note: PIR is an option for
occupancy detection. Set the
PIR Func parameter to off
unless the PIR onboard
occupancy sensor is
installed. The PIR Func
parameter is not
automatically set when the
PIR occupancy sensor cover
is plugged in. You must
change the PIR Func
parameter setting to on to
enable occupancy sensing.
(on): The PIR onboard occupancy sensor is installed. The BI1
parameter should be set to None.
(off): The PIR onboard occupancy sensor is disabled or not
installed. The BI1 parameter can be set to MotionNO or MotionNC.
Lockout
Selectable Lockout Levels for
limiting end-user keypad interaction.
Default: 0
Lockout
Level
Function
Occupied
Temperature
Setpoints
Local
Override
Rooftop
Controller
Demand
Override
(0): Level 1
Access
Access
Access
(1): Level 2
Access
Access
No Access
(2): Level 3
Access
No Access
No Access
(3): Level 4
No Access
No Access
No Access
BI13
Configuration of Binary Input 1.
Default: None
Note: BI1 can be used for remote
mounted occupancy
sensing.
(None): No function is associated with an input.
(MotionNO*): Used in the occupied mode only to toggle from the
occupied setpoint to the standby setpoint when no motion is
detected in the zone for 30 minutes. As soon as motion is detected
in the zone, the occupied setpoint resumes. Contact open = no
motion detected; contact closed = motion detected.
(MotionNC*): Used in the occupied mode only to toggle from the
occupied setpoint to the standby setpoint when no motion is
detected in the zone for 30 minutes. As soon as motion is detected
in the zone, the occupied setpoint resumes. Contact open = motion
detected; contact closed = no motion detected.
* This selection option setting disables any local override function.
For PIR models, see PIR Onboard Occupancy Sensor Operation
(TEC2647Z-3+PIR Model) on page 13.
Advanced PIR occupancy sensing can function with either a
Normally Open (N.O.) or Normally Closed (N.C.) remote
PIR occupancy sensor.
RehtConf
Sets the number and type of reheat
stages controlled by the zone
controller.
Default: 1
(0): None
(1): Analog Duct Reheat Only
(2): On/Off Duct Reheat Only
(3): On/Off Peripheral Reheat Only
(4): Analog Duct Reheat and On/Off Peripheral Reheat
AO2RA/DA4
Choice of reverse or direct acting
analog reheat output signal.
Default: DA
(RA): Reverse Acting, 0 to 100% = 10 to 0 VDC
(DA): Direct Acting, 0 to 100% = 0 to 10 VDC
18
Technical Bulletin
Parameter
Appearing
on Display
Selection Options
AO2 OALK5
Sets the maximum outside air
sensor temperature at which the
first stage of zone reheat (analog
reheat stage) can be used.
Default: 55.0°F/13.0°C
Range: -40.0°F/-40.0°C to 122.0°F/50.0°C
Note: When setting the maximum outside air sensor temperature,
press the UP/DOWN arrow keys to change the temperature
in 5.0F°/2.5C° increments; press and hold the UP/DOWN
arrow keys to change the temperature in 50.0F°/25C°
increments.
BO5 OALK5
Sets the maximum outside air
sensor temperature at which the
second stage of zone reheat (on/off
reheat stage) can be used.
Range: -40.0°F/-40.0°C to 122.0°F/50.0°C
Note: When setting the maximum outside air sensor temperature,
press the UP/DOWN arrow keys to change the temperature
in 5.0F°/2.5C° increments; press and hold the UP/DOWN
arrow keys to change the temperature in 50.0F°/25C°
increments.
BO5 Time4
Sets the time base for the reheat
output (if used).
Default: 0
(0): 15 minutes (four cycles per hour), for various equipment with
mechanical relays or contactors controlling mechanical reheat
systems.
(1): 10 seconds (six cycles per minute), for various equipment with
solid-state relays that withstand short duty cycles such as electric
heat.
BO5 cont
Sets the BO5 contact function.
Default: N.O.
(N.C.): Energized = Contact Opened; De-energized = Contact
Closed
(N.O): Energized = Contact Closed; De-energized = Contact
Opened
Technical Bulletin
19
Parameter
Appearing
on Display
Selection Options
Unocc HT
Sets the Unoccupied Heating
setpoint value.
Range: 40.0°F/4.5°C to
90.0°F/32.0°C
Unocc CL
Sets the Unoccupied Cooling
setpoint value.
Range: 54.0°F/12.0°C to
100.0°F/37.5°C
St-By HT3
Sets the Standby Heating setpoint
value.
The value of this parameter should
reside between the occupied and
unoccupied heating setpoints, and
ensure that the difference between
the standby and the occupied
values can be recovered in a timely
manner when motion is detected in
the zone.
Note: This setpoint is used when
an occupancy sensor is
connected and configured
on BI1, or when a PIR
occupancy sensor cover is
used.
90.0°F/32.0°C
St-By CL3
Sets the Standby Cooling setpoint
value.
The value of this parameter should
reside between the occupied and
unoccupied cooling setpoints.
Ensure that the difference between
the standby and the occupied
values can be recovered in a timely
manner when motion is detected in
the zone.
Note: This setpoint is used when
an occupancy sensor is
connected and configured
on BI1, or when a PIR
occupancy sensor cover is
used.
Range: 54.0°F/12.0°C to
100.0°F/37.5°C
Set Type
Provides the option of temporarily
changing the heating or cooling
setpoint by pressing the UP/DOWN
arrow keys.
Default: permnent
(temporar): Local changes to the heating or cooling setpoints are
temporary and remain effective for the specified TOccTime.
(permnent): Local changes to the heating or cooling setpoints are
permanently stored in the zone controller memory.
20
Note: When adjusting the
temperature, press the
UP/DOWN arrow keys to
change the temperature in
0.5F°/0.5C° increments;
press and hold the
5.0F°/5.0C° increments.
Technical Bulletin
Parameter
Appearing
on Display
Selection Options
TOccTime
Sets the duration of the Temporary
Occupancy Time when the heating
or cooling setpoints in the Occupied
mode are established by:
• an Override Function enabled in
the Main User Menu (when the
zone controller is in the
Unoccupied mode)
• a temporary heating or cooling
setpoint
Default: 2.0 hrs
Range: 0.0 to 12.0 hrs
Note: When adjusting the TOccTime, press the UP/DOWN arrow
keys to change the time in 1-hour increments; press and hold
the UP/DOWN arrow keys to change the time in 10-hour
increments.
Cal RS
Sets the desired room air
temperature sensor calibration
(offset). The offset can be added to
or subtracted from the actual
displayed room temperature.
Default: 0.0F°/0.0C°
Range: -5.0F°/-2.5C° to 5.0F°/2.5C° adjustable in 1.0F°/0.5C°
increments
Deadband
Sets the minimum deadband
between heating and cooling
setpoints.
Range: 2.0F°/1.0C° to 5.0F°/2.5C° adjustable in 1.0F°/0.5C°
increments
Heat max
Sets the Occupied, Standby, and
Unoccupied maximum Heating
setpoint values.
90.0°F/32.0°C
Cool min
Sets the Occupied, Standby, and
Unoccupied minimum Cooling
setpoint values.
Range: 54.0°F/12.0°C to
100.0°F/37.5°C
Min Pos
Sets the minimum position of the
zone damper.
Default: 10%
Range: 0 to 100%
Max Pos
Sets the maximum position of the
zone damper.
Default: 100%
Range: 0 to 100%
MaxHTPos6
Sets the minimum heating position
of the zone damper to maximize hot
airflow on a call for reheat with cold
supply air.
Default: 30%
Range: 0 to 100%
PIHT Wei7
Sets the weight of the PI heating
demand of a zone, used in the
PI heating calculation of the zone
controller.
Default: 100%
(0%): PI Heating Weight of 0%
Note: A zone that includes a special application (such as a server
room, mechanical room, or cafeteria) may affect the average
heating demand at the rooftop controller level, resulting in
discomfort in other zones. Setting the PI heating weight to
0% eliminates this problem.
Note: When adjusting the
temperature, press the
0.5F°/0.5C° increments;
press and hold the
5.0F°/5.0C° increments.
Note: When adjusting the damper
position, press the
change the position in 1%
increments; press and hold
the UP/DOWN arrow keys to
change the position in 10%
increments.
Technical Bulletin
21
Parameter
Appearing
on Display
Selection Options
PICL Wei7
Sets the weight of the PI cooling
demand of a zone, used in the
PI cooling calculation of the zone
controller.
Default: 100%
(0%): PI Cooling Weight of 0%
Note: A zone that includes a special application (such as a server
room, mechanical room, or cafeteria) may affect the average
cooling demand at the rooftop controller level, resulting in
discomfort in other zones. Setting the PI cooling weight to
0% eliminates this problem.
1.
2.
3.
4.
5.
6.
7.
Zone MAC is the unique device address of the zone controller (from 004 to 127) on the MS/TP network.
RTC MAC is the unique device address of the rooftop controller (from 004 to 127) on the MS/TP network.
The standby setpoints are used in the standby mode. The PIR Func parameter must be set to on, or the BI1 parameter
must be set to either MotionNO or MotionNC to enable the standby mode.
The settings for this parameter are valid only if the analog reheat sequences are enabled.
The settings for this parameter can only be enabled if an outside air temperature sensor is connected and ready for
operation.
The MaxHTPos value should never be lower than the Min Pos value; likewise, the MaxHTPos value should never be
higher than the Max Pos value.
The setting for this parameter does not change the PI demand used locally at the zone controller to maintain the setpoint;
instead, it only adjusts the PI demand transferred to the rooftop controller for its highest/average demand calculations.
TEC2647Z-3 and TEC2647Z-3+PIR Zone Controller Operation and
Strategy
The zone controller is designed to control a proportional 0 to 10 VDC modulating
damper actuator, unlike low-end commercial and residential zoning thermostats
that are designed to control two-position (open/closed) damper actuators.
Proportional modulating control enables performance and control sequences that
are much closer to what is normally found in Direct Digital Control (DDC),
application-specific control devices. Proper operation of the zone controllers
requires proper communication between the rooftop controller and its associated
zone controllers.
The data exchange from the zone controllers to the associated rooftop controller
includes:
•
current Proportional plus Integral (PI) heating demand, whereby the output
value is based on the PI heating weight configuration.
•
current PI cooling demand, whereby the output value is based on the PI cooling
weight configuration.
The data exchange from the rooftop controller to the associated zone controllers
includes:
22
•
current central system occupancy
•
current system mode active (hot or cold air being delivered)
•
outside air temperature
Technical Bulletin
PIR Onboard Occupancy Sensor (TEC2647Z-3+PIR Model)
The PIR onboard occupancy sensor allows for automatic switching between fully
adjustable occupied and standby temperature setpoints without user interaction.
This feature results in incremental energy savings during scheduled occupied
periods when the space is not being used.
Demand-Based Heating and Cooling System
The system operation determines which zone controllers have heating and cooling
weighted votes used by the associated rooftop controller. The rooftop controller
uses the weighted heating and cooling demand values from selected zones to
determine if heating or cooling action is required for the system.
Internal and external zones are typically serviced from the same rooftop controller.
As a result, the system may be exposed to conflicting mid-season heating and
cooling demands. The conflicting demands are addressed with the heating and
cooling lockouts, based on the outside air temperature at the rooftop controller.
The heating or cooling action at the zone depends on how the rooftop controller
treats and calculates what is delivered to the zones. Many factors influence the
delivery and availability of hot or cold air to satisfy the current zone demand.
Table 3 through Table 5 shows the rooftop controller system mode calculation
based on the highest demand of the zones, the average of the three highest
demands, or the average of the five highest demands.
Technical Bulletin
23
Table 3: System Mode Calculation with Three Voting Zones (Example 1)
Heat Action
Voting
Zone 1
Voting
Zone 2
Voting
Zone 3
Current Heat Demand
50%
0%
0%
Heat Weight Set
50%
100%
100%
Resulting Heat Weight to Rooftop Controller
25%
0%
0%
Highest Resulting Heat Weight of Three Zones
25%
Average of Three Highest Resulting Heat Weights
8.3%
Cool Action
Current Cool Demand
Cool Weight Set
Resulting Cool Weight to Rooftop Controller
Voting
Zone 1
Voting
Zone 2
Voting
Zone 3
0%
100%
100%
100%
100%
50%
0%
100%
50%
Highest Resulting Cool Weight of Three Zones
100%
Average Cool Weight of Three Highest Zones
50%
Table 3 shows that the resulting heat and cool weight used by the rooftop controller
for the three voting zones is different, meaning different heating and cooling action
based on the configuration of the rooftop controller.
Table 4: System Mode Calculation with Three Voting Zones (Example 2)
Heat Action
Voting
Zone 1
Voting
Zone 2
Voting
Zone 3
Current Heat Demand
100%
0%
0%
Heat Weight Set
100%
100%
100%
100%
0%
0%
100%
33.3%
Cool Action
Current Cool Demand
Cool Weight Set
Voting
Zone 1
Voting
Zone 2
Voting
Zone 3
0%
100%
100%
100%
75%
75%
0%
75%
75%
75%
50%
for the three voting zones is different, meaning different heating and cooling action
based on the configuration of the rooftop controller.
24
•
If the control type of the rooftop controller is set to the highest demand, the
action of the rooftop controller is heating.
•
If the control type of the rooftop controller is set to the average of the three
highest demands, the action of the rooftop controller is cooling.
Technical Bulletin
Table 5: System Mode Calculation with Five Voting Zones (Example 3)
Heat Action
Voting
Zone 1
Voting
Zone 2
Voting
Zone 3
Voting
Zone 4
Voting
Zone 5
Current Heat Demand
100%
0%
50%
50%
0%
Heat Weight Set
100%
100%
100%
50%
100%
100%
0%
50%
25%
0%
Voting
Zone 4
Voting
Zone 5
100%
58.3%
Average of Five Highest Resulting Heat Weights
Cool Action
35%
Voting
Zone 1
Voting
Zone 2
Current Cool Demand
Cool Weight Set
Voting
Zone 3
0%
100%
0%
0%
100%
100%
50%
50%
50%
75%
0%
50%
0%
0%
75%
75%
41.7%
Average Cool Weight of Five Highest Zones
25
for the five voting zones is different, meaning different heating and cooling action
based on the configuration of the rooftop controller. The heating or cooling action
delivered to the zones also depends on the heating and cooling lockout functions,
which are based on the outside air temperature and the supply air temperature.
Overrides and Zone Controller User Interface Lockouts
Specific functions on each zone controller can be locked out by the local user. This
interface lockout prevents unauthorized inputs to the system, typically in public
areas or other areas where certain interface functions need to be prevented. The
lockout level is accessed via the Lockout parameter in the Installer Configuration
Menu. Simply set the appropriate lockout level for each zone according to the
system requirements. See Table 6 for details regarding the various lockout levels.
Table 6: Lockout Level Function Details (Part 1 of 2)
Function
Lockout
Level 0
Lockout
Level 1
Lockout
Level 2
Lockout
Level 3
Access the local occupied setpoint using the
UP/DOWN arrow keys.
Yes
Yes
Yes
No
Press the local OVERRIDE key to command the
local override function only. The local heating
and cooling demands are not sent to the rooftop
controller, and the central system does not
restart. This function is required only when
perimeter reheat is used, and it is restarted
during an override period.
Pressing the OVERRIDE key allows an override
only for the zone where the subject zone
controller resides.
No
Yes
No
No
Technical Bulletin
25
Table 6: Lockout Level Function Details (Part 2 of 2)
Function
Press the local OVERRIDE key to command the
local override function. The local heating and
cooling demands are also sent to the rooftop
controller, which restarts the central system to
deliver hot or cold air based on the current load
demand.
Pressing the OVERRIDE key allows an override
only for the zone where the subject zone
controller resides. Although hot or cold air is
delivered to the other zones in the system,
those zone controllers remain in the unoccupied
mode and function using their unoccupied
setpoints.
Lockout
Level 0
Lockout
Level 1
Lockout
Level 2
Lockout
Level 3
Yes
No
No
No
Pressing local keys that have their function locked out causes a keypad lock
message to appear on the zone controller display. If a global override is required
for the entire system and all of the zones enter the occupied mode, the override
function must be enabled at the rooftop controller. To enable this override
function, use the local user menu at the rooftop controller or configure the extra
digital input for a remote override button (if it must be installed centrally).
Zone Setpoint Limits
A demand-based heating and cooling system is designed to respond to the actual
local demand of a number of selected zones; this rule persists even if the local
demand cannot be met by the central system.
Limit the setpoint adjustments of all zone controllers, especially if they have
demand voting capability at the rooftop controller. Limit the setpoint adjustments
prevents any local setpoint adjustments from creating heating or cooling lockout
conditions at the rooftop controller, when local setpoints are unattainable. This
scenario also prevents a voting zone controller from having unreasonable authority
over the system.
For example, if a local user sets the current occupied setpoint to 62°F (17°C), the
PI weighted demand sent by this zone to the rooftop controller is always at its
maximum value.
See Table 7 for recommended local heating and cooling setpoint limits.
Table 7: Recommended Local Heating and Cooling Setpoint Limits
26
Configuration Parameter
Factory Default Setting
Recommended Setpoint
Heat max
(Maximum Local Heating
Setpoint Limit)
90°F (32°C)
75°F (24°C)
Cool min
(Minimum Local Cooling
Setpoint Limit)
54°F (12°C)
68°F (20°C)
Technical Bulletin
Heating and Cooling Weight Zone Selection
For any system to operate properly, you must carefully determine which zones
drive the system and their weight for demand calculations. The recommendations
included in Table 8 are provided as a general rule, and should be re-evaluated on a
per-job basis depending on the specifics of the system design and layout.
Table 8: Recommended Initial Number of Voting Zones with Weight
Total Number of
Zones in the System
System Layout
Recommended Initial Number
of Voting Zones with Weight
1 to 5
All Internal or External Zones
1 to 3
3 to 5
Mix and Match of Internal and
External Zones
2 to 3
6 or More1
Mix and Match of Internal and
External Zones
3 to 8
1.
Choose a practical number of zones per rooftop controller to ensure comfort in all zones.
Consider the following points when selecting voting zones:
•
Not all zones in the system need to be voting zones. Generally, anywhere from
one third to one half of the total number of zones in the system should be
voting zones.
•
For larger installations where internal zones (zones not exposed to an outside
wall) are included in the system, there should be a ratio of approximately four
external voting zones for every one internal voting zone.
•
Zones selected as voting zones for demand calculations should represent:
•
-
areas that are exposed to the highest peak heating and cooling loads.
-
areas that include a significant portion of the equipment peak load capacity.
For example, if a system has five zones where one of the zones represents
half of the peak load capacity, that zone should be selected as a voting
zone.
-
areas that are subject to momentary spikes in occupancy (if those zones are
expected to respond during increased occupancy periods). Typical
examples include conference rooms, cafeterias, or other common areas.
Selecting a voting zone that is either undersized or commissioned with
operational flaws and errors may result in erratic system behavior due to
adding total demand that cannot be met.
Consider the following points regarding weight parameter values of the voting
zones:
•
Internal zones do not affect the heating demand calculation; instead, they only
affect the cooling demand calculation. Internal zones typically call for cooling
during occupied periods, even during the winter months. If the internal zones
ever call for heating, then it is certain that the surrounding external zones are
already in the heating mode.
Technical Bulletin
27
-
It is possible for an internal zone to be slightly overcooled during peak
summer cooling loads. This situation happens when the rooftop controller
supplies its maximum cooling capacity, and when the volume of cold air
determined by the minimum position of the zone damper during occupied
periods is already providing too much cooling capacity to the internal zone.
-
It is also possible for an internal zone to be slightly overheated during peak
winter heating loads. This situation happens when the rooftop controller
supplies its maximum heating capacity; and when the volume of hot air
determined by the minimum position of the zone damper during occupied
periods is already providing too much heat, for which the internal zones
rarely need.
•
External zones considered to be of primary importance should have both their
heating and cooling weight set to 100%.
•
Zones considered to be of secondary importance may have their weight set to a
lesser value than 100%, to reflect the importance they have in the total voting
demand calculations.
•
Some zones (for example, an office surrounded by panoramic windows) may
experience problematic behavior while in their peak heating or cooling mode,
due to location, design, or degree of exposure. These problematic zones can
have their peak load demand satisfied; however, this situation usually results in
higher energy costs since some of the other zones in the system are slightly
overheated or overcooled. The installer is responsible for properly identifying
these problematic areas and determining if they should be fully satisfied (at a
certain energy expense) or if they should be left unsatisfied during specific
peak load periods, to reduce energy consumption and for the greater good of
the rest of the zones in the system.
-
Adding many voting zones (including problematic areas) to a rooftop
controller provides greater occupancy comfort at higher energy costs.
-
Restricting the number of voting zones (including problematic areas) to a
rooftop controller provides energy savings at the expense of occupancy
comfort in some of the zones in the system.
Minimum, Maximum, and Heat Flow Adjustments
Although you can balance the system using configuration settings within the zone
controller, we recommend installing a balancing damper at the balancing side
takeoff of all zones. A balancing damper reduces excessive airflow and the noise
that goes with it, if the zones or associated ductwork are oversized.
Minimum Position Adjustment (Min Pos Parameter)
This parameter sets the minimum position of the zone damper to deliver the
minimum amount of air to the zone in all conditions. When powered up, the
damper never closes below the minimum position setting.
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Technical Bulletin
Maximum Position Adjustment (Max Pos Parameter)
This parameter sets the maximum position of the zone damper to deliver the
maximum amount of hot or cold air to the zone in all conditions. When powered
up, the damper never opens above the maximum position setting.
Note: Use the Max Pos parameter to set the maximum amount of hot air
delivered to the zone. Do not use the MaxHTPos parameter to set the
maximum amount of hot air delivered to the zone. See Maximum Heat
Flow Adjustment (MaxHTPos Parameter) on page 29 for a description of
the MaxHTPos parameter.
The Max Pos parameter is also used to set the maximum amount of cold air
delivered to the zone.
Maximum Heat Flow Adjustment (MaxHTPos Parameter)
The MaxHTPos parameter sets the minimum heating position of the zone damper,
to maximize hot airflow on a call for reheat with cold supply air. The MaxHTPos
function is only used if the local reheat configuration (RehtConf parameter) is set
to any value other than (0): None (no local reheat). Table 9 includes the maximum
heat flow adjustments for the various reheat stages and reheat output time bases.
Note: The Max Pos parameter sets both the maximum amount of hot air and the
maximum amount of cold air delivered to the zone. See Maximum Position
Adjustment (Max Pos Parameter) on page 29 for a description of the Max
Pos parameter.
Table 9: Maximum Heat Flow Adjustment (Part 1 of 2)
Reheat Stage
(RehtConf
Parameter)
Time Base for
Reheat Output
(BO5 Time
Parameter)
Maximum Heat Flow Adjustment
(MaxHTPos Parameter)
(0): None
N/A
Leave the maximum heat flow at its default setting of
30%, or adjust it to any other setting. The maximum
heat flow adjustment is not used in this scenario.
(1): Analog Duct
Reheat Only
N/A
Adjust the maximum heat flow to any value higher than
the current selected minimum position.
Example: The minimum airflow is set at 25% and the
maximum heat flow is set at 75%. If the primary air is
cold, when the PI heating loop (and analog output)
goes from 0 to 100%, the zone damper moves linearly
from 25 to 75% open.
Technical Bulletin
29
Table 9: Maximum Heat Flow Adjustment (Part 2 of 2)
Reheat Stage
(RehtConf
Parameter)
Time Base for
Reheat Output
(BO5 Time
Parameter)
Maximum Heat Flow Adjustment
(MaxHTPos Parameter)
(2): On/Off Duct
Reheat Only
(0): 15 Minutes
(Four Cycles per
Hour)
cold, when the BO5 output is energized on a call for
heat, the zone damper moves directly from 25% open
to 75% open. As soon as the BO5 output is
de-energized, the zone damper returns to 25% open.
(1): 10 Seconds
(Six Cycles per
Hour) for Solid
State Relays
cold, when the BO5 output is energized on a call for
heat, the zone damper moves directly from 25% open
to 75% open. As soon as the BO5 output is
de-energized, the zone damper returns to 25% open.
(0): 15 Minutes
(Four Cycles per
Hour)
(1): 10 Seconds
(Six Cycles per
Hour) for Solid
State Relays
N/A
cold, when the PI heating loop (and analog output)
goes from 0 to 100%, the zone damper moves linearly
from 25 to 75% open.
(3): On/Off
Peripheral Reheat
Only
(4): Analog Duct
Reheat and On/Off
Peripheral Reheat
The selected minimum position of the zone damper has a direct impact on the
temperature stability within certain zones. Having a minimum position selected
can produce an overcooling or overheating effect. This effect is created by the
minimum position, when the primary air temperature is in the opposite mode than
what the zone currently requires (for example, an internal zone that is calling for
cooling in the winter, while the rooftop controller is supplying hot air for the
external zones).
Depending on the application, setting a minimum position for a zone damper may
be mandatory. Eliminating this minimum position, or at least lowering it to a value
below the standard, may resolve certain system design issues. A good example of
this issue is an internal zone with a grossly oversized VAV unit.
30
Technical Bulletin
Balancing the Minimum, Maximum, and Heat Flow Values
To balance the minimum airflow:
1. Set the outside heating lockout value (H lock parameter) at the rooftop
controller to ensure that local system heating is allowed.
2. Check that the system is in the heating mode. To do so, press the SCROLL
button on the rooftop controller to show the local Zone Sequence = Heat
prompt.
3. Adjust the appropriate setpoints to ensure that the voting zones call for heating.
4. Adjust the local setpoint of the currently balanced zone controller to its
minimum value (for example, 60°F [16°C] or at least 7 to 8F° [3.5 to 4C°]
lower than the current room temperature), to drive the zone damper to its
minimum position.
5. Set the Min Pos parameter to the desired value, as required to balance the
minimum airflow.
To balance the maximum airflow:
1. Set the outside heating lockout value (H lock parameter) at the rooftop
controller to ensure that local system heating is allowed.
2. Check that the system is in the heating mode. To do so, press the SCROLL
button on the rooftop controller to show the local Zone Sequence = Heat
prompt.
3. Adjust the appropriate setpoints to ensure that the voting zones call for heating.
maximum value (for example, 80°F [27°C] or at least 7 to 8F° [3.5 to 4C°]
higher than the current room temperature), to drive the zone damper to its
maximum position.
5. Set the Max Pos parameter to the desired value, as required to balance the
maximum airflow.
To balance the maximum heat flow:
1. Set the outside cooling lockout value (C lock parameter) at the rooftop
controller to ensure that local system cooling is allowed.
2. Set the outside reheat lockout value (AO2 OALK or BO5 OALK parameter)
at the zone controller to ensure that local reheat is allowed.
3. Check that the system is in the cooling mode. To do so, press the SCROLL
button on the rooftop controller to show the local Zone Sequence = Cool
prompt.
4. Adjust the appropriate setpoints to ensure that the voting zones call for cooling.
maximum value (for example, 80°F [27°C] or at least 7 to 8F° [3.5 to 4C°]
higher than the current room temperature), to drive the zone damper to its
minimum position.
Technical Bulletin
31
6. Set the MaxHTPos parameter to the desired value, as required to balance the
maximum heat flow.
0 to 100% parameter value is directly converted to 0 to 10 VDC on the VAV
damper output. If the actuator has a input range of 2 to 10 VDC, then entering 50%
minimum position is not directly converted to 50% VAV damper position. See
Table 10 for the VAV damper position based on the actuator input range.
Table 10: VAV Damper Position
Actuator
Input Range
VAV Damper Position
0%
10%
20%
30%
40%
50%
60%
70%
80%
100%
0 to 10 VDC
0%
10%
20%
30%
40%
50%
60%
70%
80%
100%
2 to 10 VDC
0 to 20%
28%
36%
44%
52%
60%
68%
76%
84%
100%
The damper position is never linear and proportional to the airflow in a
pressure-dependent application. Depending on how the zone damper is sized, a
VAV box can be, at best, slightly oversized or slightly undersized. In all instances,
the PI loop of the zone controller compensates to determine the proper damper
position that satisfies the current zone demand. Figure 4 illustrates the relationship
between damper position and airflow for oversized and undersized VAV boxes.
Airflow
Airflow
Undersized VAV Box
Oversized VAV Box
% Open
% Open
FIG: efctv_cntrl_ar
Effective
Control
Area
Effective
Control
Area
Figure 4: Effective Control Area
Note: Be certain that the actuator is installed and set up properly so the blades of
the VAV damper can rotate from the fully open to the fully closed position
with no mechanical interference. Use the position settings on the zone
controller in ensuring proper installation and VAV damper rotation.
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Technical Bulletin
Terminal Reheat Lockout
We recommend locking out the local terminal reheat of the zones during the
summer months when reheat is not required. Locking out the local terminal reheat
prevents calls for local reheat simply based on a configured outside air temperature
value. Table 11 includes the terminal reheat lockout adjustments for the various
reheat stages.
Table 11: Terminal Reheat Lockout Adjustment
Reheat Stage (RehtConf
Parameter)
Analog Reheat Stage
(AO2 OALK Parameter)
On/Off Reheat Stage
(BO5 OALK Parameter)
(0): None
N/A
N/A
(1): Analog Duct Reheat Only
Set the analog reheat stage
to the desired temperature.
N/A
(2): On/Off Duct Reheat Only
N/A
Set the on/off reheat stage
(3): On/Off Peripheral Reheat
Only
N/A
(4): Analog Duct Reheat and
On/Off Peripheral Reheat
Set the analog reheat stage
This setting can be different
than the on/off reheat stage
temperature setting.
This setting can be different
than the analog reheat stage
temperature setting.
Configuring the TEC2664Z-3 Rooftop Controller
The TEC2664Z-3 Rooftop Controller ships from the factory with default settings
for all configurable parameters. The default settings are shown in Table 12. Access
the Installer Configuration Menu on the rooftop controller to reconfigure the
parameters.
1. To access the Installer Configuration Menu, press and hold the MENU key for
approximately 8 seconds.
2. Once the Installer Configuration Menu begins, press the NO key to scroll
through the parameters listed in Table 12.
3. When the desired parameter appears, use the YES key to choose the desired
selection option.
4. Press the YES key and then the NO key to continue scrolling through the
parameters.
When the rooftop controller is in the Installer Configuration Menu and left
unattended for approximately 8 seconds, the rooftop controller reverts to the Auto
Scroll Display.
Configuring Input DI1
When DI1 is configured for an alarm condition, an alarm condition appears locally
when the input is closed. An alarm message appears on the Auto Scroll Display;
and the backlight momentarily lights up when the message appears.
Technical Bulletin
33
The DI1 input can be configured to the selection options included in Table 12.
Table 12: TEC2664Z-3 Rooftop Controller Installer Configuration Menu (Part 1 of 4)
Parameter
Appearing
on Display
Selection Options
RTC MAC1
the rooftop controller on the MS/TP
network.
Default: 4
Note: This parameter setting must
be the same as the RTC
MAC parameter setting for
all zone controllers
associated with this rooftop
controller.
Range: 004 to 127
RTC Baud
Sets the baud rate of the rooftop
controller on the MS/TP network.
Default: Auto
(9600): 9600 bps
(19200): 19,200 bps
(38400): 38,400 bps
(76800): 76,800 bps
(Auto): Auto Baud
Lockout
Selectable Lockout Levels for
limiting end-user keypad interaction.
Default: 0
Lockout
Level
Function
Local
Unocc
Override2
System
Mode
Setting
Schedule
Setting
Clock
Setting
(0): Level 1
Access
Access
Access
Access
(1): Level 2
Access
No Access
No Access
Access
(2): Level 3
No Access
No Access
No Access
Access
Pwr del3
Sets the delay time period at rooftop
controller powerup, or at each time
power is removed and reapplied,
before any operation (fan, heating,
or cooling) is authorized. Also can
be used to sequence the startup of
multiple units in one location.
Default: 30.0 sec
Range: 10.0 to 120.0 sec
CntrlTyp
Sets how the rooftop controller is
controlled.
Default: AV_H3
(Highest): The highest PI Heating or Cooling demand controls the
rooftop controller.
(AV_H3): The average of the three highest PI Heating or Cooling
demands controls the rooftop controller.
(AV_H5): The average of the five highest PI Heating or Cooling
demands controls the rooftop controller.
Dis HL4
Sets the Discharge Air High Limit
temperature value at which the
heating stages are locked.
Default: 120.0°F/49.0°C
Range: 70.0°F/21.0°C to 150.0°F/65.5°C
Dis LL4
Sets the Discharge Air Low Limit
temperature value at which the
cooling stages are locked.
Range: 35.0°F/2.0°C to 65.0°F/18.0°C
Anticycl
Anti-Short Cycle timer sets the
minimum on/off times for heating
and cooling stages.
Default: 2.0 min
Range: 0.0 to 5.0 min adjustable in 1-minute increments
Note: Set the anti-short cycle timer to 0.0 min for equipment that
already has its own anti-short cycle timer.
Heat cph
Sets the maximum number of
Heating cycles per hour.
Default: 4.0
Range: 3.0 to 8.0 cycles per hour
34
Technical Bulletin
Parameter
Appearing
on Display
Selection Options
Cool cph
Sets the maximum number of
Cooling cycles per hour.
Default: 4.0
Range: 3.0 or 4.0 cycles per hour
Deadband
Sets the minimum deadband
between the heating and cooling
setpoints.
Range: 2.0F°/1.0C° to 4.0F°/2.0C° adjustable in 1.0F°/0.5C°
increments
Units
Sets the display scale of the rooftop
controller.
Default: Imp
(Si): Celsius/Pa
(Imp): Fahrenheit/in. W.C.
Fan del
Fan delay extends fan operation
after a heating or cooling cycle has
ended.
Default: off
(on): Extends fan operation by 60 seconds after a heating or cooling
cycle has ended.
(off): No extension of fan operation after a heating or cooling cycle
has ended.
Note: The fan delay is only active when the GUI System Mode is
set at Auto and the GUI Occupancy is set at Unoccupied.
DI1
Configuration of Digital Input 1.
Default: None
Note: DI1 can be used for remote
mounted occupancy
sensing.
(None): No function is associated with an input.
(RemNSB): Remote Night Setback (NSB) via a time clock input, an
occupancy sensor, or from a voltage-free contact.
Contact open = Occupied; contact closed = Unoccupied
(RemOVR): Temporary occupancy request via a remote input. This
override function is controlled by a manual remote occupancy
override. When enabled, this condition disables the override
capacity of the rooftop controller.
(Filter): A Filter alarm is displayed. This alarm can be connected to
a differential pressure switch that monitors a filter.
(Service): A Service alarm is displayed on the rooftop controller
when the input is energized. This input can be tied into the air
conditioning unit control card, which provides an alarm should there
be a malfunction.
TOccTime
Sets the duration of the Temporary
Occupancy Time when the heating
or cooling setpoints in the Occupied
mode are established by:
• an Override Function enabled in
the Main User Menu (when the
rooftop controller is in the
Unoccupied mode)
• a temporary heating or cooling
setpoint
Default: 3.0 hrs
Range: 0.0 to 12.0 hrs
Note: When adjusting the TOccTime, press the UP/DOWN arrow
keys to change the time in 1-hour increments; press and hold
the UP/DOWN arrow keys to change the time in 10-hour
increments.
Cal RS
Sets the desired Room Air
Temperature Sensor Calibration
displayed room temperature.
increments
Cal OS
Sets the desired Outside Air
Temperature Sensor calibration
displayed outside air temperature.
increments
Technical Bulletin
35
Parameter
Appearing
on Display
Selection Options
H stage
Sets the number of Heating stages.
Default: 2
(1): One stage of heating
(2): Two stages of heating
Note: Two-stage rooftop controller operation reverts to one-stage
operation only when the second heating step is not required.
C stage
Sets the number of Cooling stages.
Default: 2
(1): One stage of cooling
(2): Two stages of cooling
Note: Two-stage rooftop controller operation reverts to one-stage
operation only when the second cooling step is not required.
H lock5
Discontinues Heating operation in
response to the outside air
temperature. Requires that an
outside air temperature sensor be
installed and connected.
Default: 120.0°F/49.0°C
Range: -15.0°F/-26.0°C to 120.0°F/49.0°C
C lock5
Discontinues Cooling operation in
response to the outside air
temperature. Requires that an
outside air temperature sensor be
installed and connected.
Default: -40.0°F/-40.0°C
Range: -40.0°F/-40.0°C to 95.0°F/35.0°C
2/4event
Sets the number and configuration
of events.
Default: 2 events
(2 events): Sets up programming for the following:
Event 1 is for Occupied setpoints.
Event 2 is for Unoccupied setpoints.
(4 events): Sets up programming for the following:
Aux cont
Energizes peripheral devices
(lighting equipment, exhaust fans,
and economizers).
Default: n.o.
(n.c.): Contact open = Occupied; contact closed = Unoccupied
(n.o.): Contact closed = Occupied; contact open = Unoccupied
Note: The contact toggles with the internal Occupied/Unoccupied
schedule (or the remote NSB contact if DI1 is used).
Prog rec
Enables Progressive recovery.
Default: off
Note: Progressive recovery is
automatically disabled if
DI1 is configured for
remote NSB.
(on): Progressive recovery enabled
Note: The programmed Occupied schedule time is the time at
which the desired Occupied temperature is attained. The
rooftop controller automatically optimizes the equipment start
time.
(off): Progressive recovery disabled
Note: The programmed Occupied schedule time is the time at
which the system restarts.
Occ CL4
If network communication is lost
with the zone controller(s), the
return air sensor controls the rooftop
controller to maintain this Cooling
setpoint.
Range: 54.0°F/12.0°C to 100.0°F/37.5°C
Occ HT4
controller to maintain this Heating
setpoint.
Range: 40.0°F/4.5°C to 90.0°F/32.0°C
36
Technical Bulletin
Parameter
Appearing
on Display
Selection Options
Unocc CL4
controller to maintain this
Unoccupied Cooling setpoint.
Range: 54.0°F/12.0°C to 100.0°F/37.5°C
Unocc HT4
controller to maintain this
Unoccupied Heating setpoint.
Range: 40.0°F/4.5°C to 90.0°F/32.0°C
Sp range6
Sets the static pressure transducer
range.
Default: 0
(0): 0 in. W.C./0 Pa to 1.5 in. W.C./375 Pa
(1): 0 in. W.C./0 Pa to 2 in. W.C./500 Pa
(2): 0 in. W.C./0 Pa to 3 in. W.C./750 Pa
(3): 0 in. W.C./0 Pa to 4 in. W.C./1,000 Pa
(4): 0 in. W.C./0 Pa to 5 in. W.C./1,250 Pa
Pressure6
Sets the static pressure transducer
setpoint maintained by the bypass
damper.
Default: 0.8 in. W.C./200 Pa
Range: 0 in. W.C./0 Pa to 2 in. W.C./500 Pa
1.
2.
3.
4.
5.
6.
RTC MAC is the unique device address of the rooftop controller (from 004 to 127) on the MS/TP network.
Local Unocc Override appears only when in the Unoccupied mode.
When adjusting the numeric value, press the UP/DOWN arrow key to change the value by single increments; press and
hold the UP/DOWN arrow key to change the numeric value in increments of ten.
When adjusting the temperature, press the UP/DOWN arrow key to change the value in 0.5F°/0.5C° increments; press and
hold the UP/DOWN arrow key to change the value in 5.0F°/5.0C° increments.
When adjusting the temperature, press the UP/DOWN arrow key to change the value in 5.0F°/5.0C° increments; press and
hold the UP/DOWN arrow key to change the value in 50.0F°/50.0C° increments.
This value is adjustable in 0.1 in. W.C./25 Pa increments.
TEC2664Z-3 Rooftop Controller Operation and Strategy
The TEC2664Z-3 Rooftop Controller uses PI demand to operate heating and
cooling stages. In addition, accurate temperature control at the zones is achieved
via a unique, time-proportioning algorithm that virtually eliminates temperature
offset associated with traditional, differential-based zone controllers. This feature
enables performances and control sequences that are much closer to what is
normally found in DDC application-specific control devices.
The operation of the rooftop controller is directly related to the operation of the
dedicated zone controllers. Although the rooftop controller can operate in a
stand-alone manner if the rooftop controller loses network communication, normal
system operation requires that the controller be communicating on the network.
Technical Bulletin
37
Data Exchange Between the Rooftop Controller and the Zones
Heating and cooling demand is first exchanged from the zone controllers to the
rooftop controller. These output values are based on the PI heating weight
configuration and the PI cooling weight configuration. Each voting zone also
calculates its demand values based on the occupancy mode and setpoints currently
in use: Unoccupied, Standby, or Occupied.
The rooftop controller calculates the resulting PI heating and cooling demands
based on the control type configuration (CntrlTyp parameter setting). See
Demand-Based Heating and Cooling System on page 23 for more information.
•
If the resulting calculated PI heating demand is greater than the resulting
calculated PI cooling demand, then the zone controller sequence is heating.
•
If the resulting calculated PI cooling demand is greater than the resulting
calculated PI heating demand, then the zone controller sequence is cooling.
•
If the resulting calculated PI cooling demand is equal to the resulting
calculated PI heating demand, then the zone controller sequence remains in its
latest mode.
Many factors can limit action to the heating and cooling stages, including:
•
heating and cooling lockout based on the outside air temperature
•
heating or cooling lockout based on the supply air temperature
•
heating or cooling lockout based on anti-cycling
•
fixed 2-minute delay when the rooftop controller toggles between heating and
cooling
The rooftop controller forwards the following data to the zone controllers:
•
current central system occupancy
•
current zone sequence required (either hot or cold air delivered to the zone)
•
outside air temperature
Occupancy and Overrides
The occupancy mode of all the zones in a system is typically dictated by the
rooftop controller schedule. If the schedule output value is unoccupied (as
displayed on the rooftop controller), then the zones in the system are in the
unoccupied mode. If the schedule output value is occupied (as displayed on the
rooftop controller), then the zones in the system are either in the occupied mode or
the standby mode if the local PIR function is used.
Using a remote schedule by means of the DI1 parameter with a time clock input,
an occupancy sensor, or from a voltage-free contact disables the local schedule
occupancy function to the zones.
38
Technical Bulletin
Global override for the entire system including all zones is initiated at the rooftop
controller level only. Set the override function using the Main User Menu at the
rooftop controller, or by configuring the extra digital input (DI1 parameter) for a
remote override button if it is required to be installed centrally.
Any zone overrides trigger the necessary heating or cooling action for the required
zone only. All other zones in the system that do not require an override remain in
the unoccupied mode.
Rooftop Controller User Interface Lockouts
The rooftop controller can be set to lock out specific functions performed by the
local user. This interface lockout prevents unauthorized inputs to the system,
typically in public areas or other areas where certain interface functions need to be
prevented. The lockout level is accessed via the Lockout parameter in the Installer
Configuration Menu. Simply set the appropriate lockout level for each zone
according to the system requirements. See Table 13 for details regarding the
various lockout levels.
Table 13: Lockout Level Function Details
Function
Lockout
Level 0
Lockout
Level 1
Lockout
Level 2
Global Override Function via Main User Menu
Yes
Yes
No
System Mode Access via Main User Menu
Yes
No
No
Local Schedule Access via Main User Menu
Yes
No
No
Local Clock Setting via Main User Menu
Yes
Yes
Yes
Rooftop Controller Heating and Cooling Supply Air Temperature Lockouts
One problematic aspect of any VAV zoning control system is high heating or
cooling demand when most of the zone dampers are closed. As a result of this
situation, most of the supply air is recirculated through the pressure bypass,
leading to extremely hot or cold supply air conditions.
To prevent high supply air temperatures (specifically with gas heating systems), set
the discharge air high limit temperature (Dis HL parameter) to the required value.
•
Default: 120.0°F/49.0°C
•
Range: 70.0°F/21.0°C to 150.0°F/65.5°C
•
When adjusting the temperature, press the UP/DOWN arrow key to change the
value in 0.5F°/0.5C° increments; press and hold the UP/DOWN arrow key to
change the value in 5.0F°/5.0C° increments.
To prevent low supply air temperatures (specifically to guard against coil freeze-up
when a high bypass ratio is in effect), set the discharge air low limit temperature
(Dis LL parameter) to the required value.
•
•
Range: 35.0°F/2.0°C to 65.0°F/18.0°C
Technical Bulletin
39
•
When adjusting the temperature, press the UP/DOWN arrow key to change the
value in 0.5F°/0.5C° increments; press and hold the UP/DOWN arrow key to
change the value in 5.0F°/5.0C° increments.
Rooftop Controller Heating and Cooling Outside Air Temperature Lockouts
Use the C lock parameter to disable cooling operation in response to the outside air
temperature. Likewise, use the H lock parameter to disable heating operation in
response to the outside air temperature. Both the heating and cooling outside air
temperature lockouts require that an outside air temperature sensor be installed and
connected.
The installer is responsible for setting the rooftop controller mode lockouts
properly to minimize heating and cooling equipment cycling while considering
occupancy comfort. The lockout settings are also dependent on the load
requirements for the specific geographical region:
•
In cool climate regions, the installer may allow the rooftop controller to deliver
heating up to a 75°F (24°C) outside air temperature due to the amount of the
time it takes for building mass to heat up when transitioning from a cold night
into a hot, mid-season day.
•
In warm climate regions, the installer may allow the rooftop controller to
deliver cooling without a cooling mode lockout, while imposing strong
restrictions on the heating side of the system.
Heating and cooling equipment cycling occurs only in the overlapping deadband
between the C lock and H lock parameter settings as illustrated in Figure 5. The
smaller the deadband between these two parameter settings, the less heating and
cooling equipment cycling occurs.
Heating Lockout =
75°F (24°C)
Cooling Lockout =
65°F (18°C)
FIG:ovrlppng_ddbnd
Overlapping
Deadband =
10F°/6C°
Outside Air Temperature
Figure 5: Overlapping Deadband
40
Technical Bulletin
It is possible to adjust the system to completely eliminate heating and cooling
equipment cycling based on the outside air limitations, if this type of system
operation is desired. Figure 6 illustrates two ways to eliminate overlapping
deadband and the associated equipment cycling.
Note: Eliminating overlapping deadband may impact the control performance of
certain zones during other periods of system operation.
Heating Lockout =
72°F (22°C)
No Overlapping Deadband
Cooling Lockout =
72°F (22°C)
5F° (3C°)
Deadband;
No Heating
and
No Cooling
Cooling Lockout =
75°F (24°C)
FIG:no_ovrlppng_ddbnd
Heating Lockout =
70°F (21°C)
Figure 6: No Overlapping Deadband
Seasonal Changeover
Heating and cooling equipment cycling during seasonal changeover is almost
inevitable with a VAV zoning control system, if you want to maintain any degree
of occupancy comfort. A properly set up system delivers comfort to conflicting
zone demands during seasonal changeover by alternating between heating and
cooling at the rooftop controller.
Unwanted heating and cooling switchovers are eliminated by either using and
authorizing terminal reheat, or by limiting the rooftop controller heating and
cooling capacity throughput based on the outside air temperature (H lock and
C lock parameters).
Note: Limiting the rooftop controller heating and cooling capacity throughput
based on the outside air temperature may impact the control performance
of certain zones in the system, since the required heating or cooling
capacity is no longer available due to the lockout conditions.
Technical Bulletin
41
Typically, the number of rooftop controller heating and cooling switchover cycles
during conflicting demand periods is approximately the same as the number of
heating and cooling cycles per hour (Heat cph and Cool cph parameters). The
default for Heat cph and Cool cph is four cycles per hour, meaning two heating
cycles and two cooling cycles within a 1-hour period.
The recorded rooftop controller change in supply temperature and demand
variances is always higher when using the Highest demand control-type operation
versus the Average demand method calculations. Energy consumption is also
higher with the Highest demand control-type operation versus the Average demand
method calculations.
Bypass Damper Control and Operation
The rooftop controller has a built-in static pressure control loop with an analog
0 to 10 VDC bypass damper output. For proper operation, the static pressure
control loop must have a static pressure sensor connected to the static pressure
input (Terminal SP) on the rooftop controller. Typically, the static pressure sensor
probe is installed approximately two-thirds of the way down the main ventilation
trunk.
The required static pressure transducer needs to be a voltage type (0 to 5 VDC
output range). Set the static pressure transducer range (using the SP range
parameter) to one of the following:
•
(0): 0 in. W.C./0 Pa to 1.5 in. W.C./375 Pa
•
(1): 0 in. W.C./0 Pa to 2 in. W.C./500 Pa
•
(2): 0 in. W.C./0 Pa to 3 in. W.C./750 Pa
•
(3): 0 in. W.C./0 Pa to 4 in. W.C./1,000 Pa
•
(4): 0 in. W.C./0 Pa to 5 in. W.C./1,250 Pa
Set the static pressure transducer setpoint using the Pressure parameter. The
default setpoint is 0.8 in. W.C./200 Pa, and is adjustable from 0 in. W.C./0 Pa to
2 in. W.C./500 Pa in 0.1 in. W.C./25 Pa increments.
Note: The rooftop controller Sensor Common is not isolated from the 24 VAC
input power. If the static pressure transducer also requires 24 VAC for
power, ensure that the static pressure transducer is connected matching the
polarity of the rooftop controller. See Multiple 24 VAC Zone Controller
Transformers versus a Single 24 VAC Zone Controller Transformer.
The static pressure scale automatically changes from inches of water column
(in. W.C.) to Pascals (Pa) when the Units parameter is changed from
(Imp): Fahrenheit/in. W.C. to (Si): Celsius/Pa.
42
Technical Bulletin
Operation of the static pressure control loop depends on whether the fan is
running. For proper operation of the static pressure control loop, the static pressure
control actuator must be installed properly. When the control signal is 0 VDC, the
static pressure damper is fully closed with no air recirculating from the supply to
the return. Conversely, when the control signal is 10 VDC, the static pressure
damper is fully open with maximum air recirculating from the supply to the return.
When the fan output is off (Terminal G), the static pressure control loop is also off
and the bypass damper is fully open to the 10 VDC output. This condition
minimizes the air pressure related noise during initial fan startup. Be aware that the
fan is always on during occupied periods, and that it only cycles on demand with
the heating and cooling stages during unoccupied periods.
When the fan output is on (Terminal G), the static pressure control loop is enabled
and the bypass damper modulates to maintain the desired static pressure setpoint
based on the static pressure input reading at the rooftop controller. Use the Manual
Scroll Display feature at the rooftop controller to locate the Pressure parameter
and determine the current static pressure value.
TEC2647Z-3 and TEC2647Z-3+PIR Zone Controllers
The sequence of operation is determined by the Johnson Controls
TEC2664Z-3 Rooftop Controller mode and the configuration parameters
preselected for the zone controller; see TEC2664Z-3 Rooftop Controller on page
44 for more information. See Figure 7 through Figure 16 for sequence of operation
examples.
PIR Occupancy Sensor Operation
The zone controller is available with or without a factory-installed PIR occupancy
sensor cover. A zone controller equipped with the PIR occupancy sensor cover
provides advanced active occupancy logic that automatically switches occupancy
levels from occupied to standby as required, when motion is sensed. This feature
results in incremental energy savings during scheduled occupied periods when the
space is unoccupied. This feature allows zones, such as conference rooms and
storage rooms, that are infrequently occupied to use conservative setpoints during
most of their occupied period when the space is not being used.
Standby setpoints allow the system to recover fairly quickly between the standby
and occupied setpoints when motion is detected in the zone. The conservative
value of the standby setpoint must be far enough from the occupied setpoint to
warrant the energy savings of a PIR occupancy sensor, but close enough for the
system to recover quickly to ensure occupancy comfort.
To enable the advanced occupancy logic, the following parameters must be set at
the zone controller:
•
If a local PIR occupancy sensor cover is installed, the PIR Func parameter
must be set to on.
Technical Bulletin
43
•
If a remote PIR occupancy sensor is attached to BI1, the BI1 parameter must
be set to MotionNO or MotionNC.
PIR Occupancy Sensor Logic
The PIR occupancy sensing function is only used during occupied periods. If
occupancy is desired during an unoccupied period, simply press the local override
button (if allowed by the local lockout level configuration). The local occupancy
toggles to override (local occupied) per the TOccTime parameter setting for
overrides.
If the PIR occupancy sensor detects no motion, the zone controller remains in the
standby mode. If motion is detected, the zone controller switches to the occupied
mode for a period of 60 minutes after the last motion was detected. When the
60-minute period expires and no additional motion is detected, the zone controller
switches back to the standby mode.
The sequence of operation of the zones is commanded from the
TEC2664Z-3 Rooftop Controller on a Change of Value (COV) basis. The rooftop
controller transmits its current sequence mode to the zones, depending on the
highest or highest average PI demand. The available sequence values at the zones
are heating and cooling. There is a 2-minute delay when toggling between the
heating and cooling modes. This delay only applies when the system is switching
over from the network demand. The delay is not active when working with the
Comm Lost parameter using the return air temperature sensor or the room air
temperature sensor. If the system mode of the rooftop controller is set to off, the
sequence value at the zone is cooling by default.
Note: If no return air sensor is installed and communication is lost, control of the
rooftop unit is based on the onboard sensor readings of the rooftop
controller.
The user can choose between a single highest PI demand, an average of the three
highest PI demands, or an average of the five highest PI demands.
Using the five highest PI demands as an example, five buffers are required in the
BACnet module of the rooftop controller for the PI heating demand, and five
additional buffers are required for the PI cooling demand. Each time a new zone
sends its PI cooling demand, the rooftop controller compares it to the lowest of the
five values already stored and buffers it (if required). The rooftop controller
averages these five values, and the PI heating demand or PI cooling demand
controls the rooftop controller.
See Figure 7 through Figure 17 for sequence of operation examples.
44
Technical Bulletin
Heating
Setpoint
Cooling
Setpoint
FIG:cntrl_crv_1
AO1
Figure 7: Zone Controller Set for No Reheat, AO2 = 0 VDC and BO5 = Off
(Rooftop Controller in Cooling Mode)
Heating
Setpoint
Cooling
Setpoint
FIG:cntrl_crv_2
AO1
Figure 8: Zone Controller Set for No Reheat, AO2 = 0 VDC and BO5 = Off
(Rooftop Controller in Heating Mode)
Heating
Setpoint
Cooling
Setpoint
AO2
* If AO2 stage is locked, then AO1 = minimum position.
FIG:cntrl_crv_3
AO1
Figure 9: Zone Controller Set for Analog Duct Reheat Only, BO5 = Off
Technical Bulletin
45
Heating
Setpoint
Cooling
Setpoint
AO2
FIG:cntrl_crv_4
AO1
Figure 10: Zone Controller Set for Analog Duct Reheat Only, BO5 = Off
Heating
Setpoint
Cooling
Setpoint
B05
FIG:cntrl_crv_5
A01
Figure 11: Zone Controller Set for On/Off Duct Reheat Only,
AO2 = 0% and On/Off Reheat Time Base = 10 Seconds
46
Technical Bulletin
B05
Heating
Setpoint
Cooling
Setpoint
FIG:cntrl_crv_6
AO1
Figure 12: Zone Controller Set for On/Off Duct Reheat Only,
AO2 = 0% and On/Off Reheat Time Base = 15 Minutes
Heating
Setpoint
Cooling
Setpoint
B05
FIG:cntrl_crv_7
AO1
Figure 13: Zone Controller Set for On/Off Duct Reheat Only, AO2 = Off
Technical Bulletin
47
Heating
Setpoint
Cooling
Setpoint
B05
AO1
FIG:cntrl_crv_8
AO1
Figure 14: Zone Controller Set for On/Off Peripheral Reheat Only, AO2 = 0%
Heating
Setpoint
Cooling
Setpoint
B05
AO2
FIG:cntrl_crv_9
AO1
* If AO2 stage is locked, then AO1 = minimum position.
Figure 15: Zone Controller Set for Terminal Reheat on AO2 and
Peripheral Heating on BO5
48
Technical Bulletin
B05
Heating
Setpoint
AO2
Cooling
Setpoint
FIG:cntrl_crv_10
AO1
Figure 16: Zone Controller Set for Terminal Reheat on AO2 and Peripheral Heating on BO5
Stage
2
Stage
2
100%
PI Demand
Stage 2
Start/Stop
(Approx.)
Stage 1
Start/Stop
(Approx.)
PI Demand (Depends on Control Type Selected)
Increase Heating
Stage
1
Stage 1
Start/Stop
(Approx.)
0%
PI Demand
Stage 2
Start/Stop
(Approx.)
100%
PI Demand
PI Demand (Depends on Control Type Selected)
Increase Cooling
Figure 17: Rooftop Controller Sequence of Operation for
Two-Stage Heating and Two-Stage Cooling
Technical Bulletin
49
FIG:tw_stg_htng_tw_stg_clg
Stage
1
TEC2664Z-3 Rooftop Controller Operation and Strategy
Main User Menu Access Modifications
Each of the sections in the Main User Menu are accessed and programmed using
the five keys on the cover of the TEC2664Z-3 Rooftop Controller. See
TEC2664Z-3 Rooftop Controller Operation Overview on page 14 for a description
of the five user interface keys. Figure 18 charts the flow of the Main User Menu.
FIG:mn_usr_mnu
The system mode can be set to either Off or Auto. The Auto mode allows the
rooftop controller to determine, from the average PI demand (if a network is
detected) or from the return air sensor PI demands (if a network is not detected), if
the rooftop unit is in heating mode or cooling mode.
Figure 18: Main User Menu
50
Technical Bulletin
Sequence of Auto Status Display Scrolling
The TEC2664Z-3 Rooftop Controller features a two-line, eight-character status
display. A low-level, backlight is always active, and can only be seen in the dark.
When the rooftop controller is left unattended, an auto scroll status display
indicates the actual status of the system.
Each item is scrolled one-by-one with the backlight in the low-level mode.
Pressing any key causes the low-level backlight to brighten to high-level mode.
When left unattended for 30 seconds after changes are made, the display resumes
auto status display scrolling.
To brighten the low-level backlight to high-level mode, simply press any key on
the face of the rooftop controller. The high-level backlight returns to low-level
mode when the rooftop controller is left unattended for 45 seconds.
Any alarms detected are automatically displayed at the end of the status display
scroll. When an alarm message appears, the backlight lights up at the same time as
the alarm message and shuts off during the remainder of the status display scroll.
Two alarm messages can appear at any given time.
The priority of alarms is as follows:
•
Comm Lost: This alarm indicates that communication is lost between the
rooftop controller and the zone devices on the MS/TP Bus; however, the
rooftop controller can remain online with the supervisory controller.
•
SetClock: This alarm indicates that the clock needs to be reset due to a power
failure of more than 6 hours.
•
DAS Alrm: This alarm indicates a high or low alarm at the discharge air
sensor. If no discharge air sensor is connected (-40.0°F/-40.0°C reading), the
associated functions (such as lockouts and alarms) are disabled. If the
discharge air sensor is shorted (122.0°F/50.0°C reading), the associated
functions (such as lockouts and alarms) are enabled.
•
Service: This alarm indicates there is a service alarm, as per the configurable
Digital Input DI1.
•
Filter: This alarm indicates that the filters are dirty and need to be replaced, as
per the configurable Digital Input DI1.
See Table 14 for the sequence of auto status display scrolling.
Technical Bulletin
51
Table 14: Sequence of Auto Status Display Scrolling
Clock Status
System Mode
Schedule Status
Outdoor
Temperature1
Alarms
(If Detected)
Monday
12:00 A.M.
Sys Mode
Off
Occupied
Outdoor
xx.x °C or °F
Service2
Sys Mode
Auto
Unoccupied
DAS Alm3
Override
SetClock4
Filter5
Comm Lost6
1.
2.
3.
4.
5.
6.
52
The outdoor temperature displays only if an outside air temperature sensor is installed. If an outside air temperature sensor
is not installed, an ambiguous outdoor temperature displays on the zone controller indicating that no outside air
temperature sensor is installed. If no outside air temperature sensor is installed, the auto status display scrolling skips past
the outdoor temperature.
This alarm is valid only if the DI1 parameter is configured and used as a service alarm.
This alarm is valid only if the Dis HL or Dis LL parameter is enabled.
This alarm is valid only if the power off clock time retention has expired.
This alarm is valid only if the DI1 parameter is configured and used as a filter alarm.
This alarm is valid only if communication is lost to the zones (not necessarily a BACnet communication failure).
Technical Bulletin
Sequence of Manual Status Display Scrolling
Press the YES key repeatedly to manually scroll through each menu item. The last
menu item viewed remains on the display for 30 seconds before auto status display
scrolling resumes. The temperature reading is automatically updated when
scrolling is held.
See Table 15 for the sequence of manual status display scrolling.
Table 15: Sequence of Manual Status Display Scrolling
Clock Status
System Mode
Schedule Status
Outdoor
Temperature1
Alarms
(If Detected)
Monday
12:00 A.M.
Sys Mode
Off
Occupied
Outdoor
xx.x °C or °F
Service2
Sys Mode
Auto
Unoccupied
DAS Alm3
Override
SetClock4
Filter5
Comm Lost6
Current Zone Sequence
Return Air
Temperature
Discharge Air
Temperature
Current Static
Pressure
Zone Seq
Off
RA Temp
xx.x°F or °C
DA Temp
xx.x°F or °C
Pressure
x.x W.C. or Pa
Effective PI Heat Demand at the
Rooftop Unit
Effective PI
Cool Demand at the
Rooftop Unit
Highest PI
Heat Demand
Zone Address
Highest PI
Cool Demand
Zone Address
Heat Out
xxx%
Cool Out
xxx%
Heat MAC
xxx
Cool MAC
xxx
Zone Seq
Cool
Zone Seq
Heat
1.
2.
3.
4.
5.
6.
The outdoor temperature displays only if an outside air temperature sensor is installed. If an outside air temperature sensor
is not installed, an ambiguous outdoor temperature displays on the zone controller indicating that no outside air
temperature sensor is installed. If no outside air temperature sensor is installed, the auto status display scrolling skips past
the outdoor temperature.
This alarm is valid only if the DI1 parameter is configured and used as a service alarm.
This alarm is valid only if the Dis HL or Dis LL parameter is enabled.
This alarm is valid only if the power off clock time retention has expired.
This alarm is valid only if the DI1 parameter is configured and used as a filter alarm.
This alarm is valid only if communication is lost to the zones (not necessarily a BACnet communication failure).
Technical Bulletin
53
Figure 19: Heating/Cooling Stages Handling
Figure 20: Bypass Damper Sequence
Figure 21: System Mode and Fan Operation
54
Technical Bulletin
Figure 22: Zone Sequence Selection
System Commissioning
For the TEC Zoning Control System to operate properly, you must commission the
system properly at all levels of the control system. A properly operating control
system depends heavily on both the demand and the response functions being fully
functional at the rooftop controller level, as well as at the zone controller level.
Proper Commissioning of the Zone Controllers
At the zone controller level, be certain of the following:
•
Properly design and size the VAV zone damper and the air distribution system
to accommodate peak load demands when the rooftop controller delivers the
capacity.
•
Check that the full span of the damper blade rotation is available to the VAV
actuator and the zone controller. There should be no mechanical limits on the
damper blade rotation, since those limits are set by the zone controller
parameters.
•
Set the VAV actuator for either Direct Acting (DA) or Reverse Acting (RA). If
the actuator is reversed, the zone demand can never be satisfied. If the zone is a
voting zone, it continuously sends demand signals to the rooftop controller.
Technical Bulletin
55
•
Properly set the Min Pos, Max Pos, and MaxHTPos parameters during zone
damper balancing. If the local VAV trunk is equipped with a main trunk-side
takeoff directional adjustment blade, additional adjustments are also required.
•
Evaluate and set the parameters for the reheat lockouts, setpoint limits, user
interface lockouts, and demand weight adjustments to the rooftop controller,
according to the installation requirements.
•
Set all zone controllers associated with the same rooftop controller to the same
RTC MAC parameter setting as the rooftop controller.
Proper Commissioning of the Rooftop Controller
At the rooftop controller level, be certain of the following:
56
•
Size the heating and cooling capacity of the rooftop controller to respond to the
highest instantaneous peak loads from the associated zones.
•
Incorporate the proper strategy and system layout into the mechanical system
architecture.
•
Properly commission and verify the bypass damper system. A bypass damper
system that has been improperly set up may result in all of the zones being
properly commissioned and sized, but the rooftop controller still may not
deliver the capacity to the zones.
•
Evaluate and set the parameters for the heating and cooling lockouts, control
type strategy, discharge air high and low limits, static pressure transducer
range, and static pressure transducer setpoint, according to the installation
requirements.
•
Verify the input/output operation of the rooftop controller, as well as the
onboard economizer operation.
Technical Bulletin
System Operation Checklists
We recommend keeping a checklist of all control system milestones and
configuration settings at system startup. Keep these records as a reference with the
control system when it is fully commissioned. The checklists included in Table 16
through Table 22 are provided as a guideline and may be helpful when servicing
the control system.
Table 16: Rooftop Controller Unit
Manufacturer
Serial Number
Model Number
Year of Manufacture
Location
Date of Original Installation
Cooling Tonnage
Cooling Number of Stages
Heating Capacity
Heating Number of Stages
Maximum cfm
Total Number of Zones
Table 17: Rooftop Controller Configuration
RTC MAC1
Cal RS
RTC Baud1
Cal OS
Lockout
H stage
Pwr del
C stage
CntrlTyp1
H lock1
Dis HL1
C lock1
Dis LL1
2/4event
Anticycl
Aux cont
Heat cph
Prog rec
Cool cph
Occ CL
Deadband
Occ HT
Units
Unocc CL
Fan del
Unocc HT
DI1
Sp range1
TOccTime
Pressure1
1.
This parameter setting is critical for proper control system operation.
Table 18: Rooftop Controller Local Schedule Settings
Day of the
Week
Occupied
Day?
First
Occupied
Event
Second
Unoccupied
Event
Third
Occupied
Event
Fourth
Unoccupied
Event
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
Technical Bulletin
57
Table 19: Rooftop Controller Commissioning
Rooftop Controller Mechanical Cooling Functional Verification
Complete
Maximum Change in Temperature (Return Air Temperature to Supply
Air Temperature) for Cooling Stage 1
Air Temperature) for Cooling Stage 1 and 2
Economizer Cooling Functional Verification Complete
Minimum Position of Economizer Properly Set?
Rooftop Controller Auxiliary Output Used to Disable Minimum
Position of Economizer Check?
Rooftop Controller Heating Functional Verification Complete
Air Temperature) for Heating Stage 1
Air Temperature) for Heating Stage 1 and 2
Static Pressure Transducer Input Reading with Fan Off1
Maximum Static Pressure Transducer Input Reading with Fan On2
Static Pressure Damper Actuator Properly Rigged and Verified?
Critical Parameters Properly Set?
RTC MAC
RTC Baud
CntrlTyp
Dis HL
Dis LL
H lock
C lock
Sp range
Pressure
Communication with the Zones Active (Status LED and Manual Scroll
Display)?
Local Time Clock Set?
Local Schedule Set?
Local System Mode Set to Auto with System On?
Outside Air Temperature Sensor Properly Connected and Displaying
Temperature (Manual Scroll Display)?
Supply Air Temperature Sensor Properly Connected and Displaying
Return Air Temperature Sensor Properly Connected and Displaying
1.
2.
58
This static pressure transducer input reading should be either 0 in. W.C. or 0 Pa.
This static pressure transducer input reading should be taken with all VAV dampers in the fully
closed position.
Technical Bulletin
Table 20: Zone Controller Number ( _____ )1
Location
Date of Original
Installation
VAV Damper Inlet
Diameter (Inches)
Zone Vocation and
Use
Perimeter Zone?
VAV Actuator Brand
Internal Zone?
VAV Actuator Model
Type of Reheat
(If Installed)
Capacity of Reheat
(If Installed)
1.
Use the Zone MAC address for the zone controller number, and repeat this checklist for all
other zone controllers in the system.
Table 21: Zone Controller Configuration
Zone MAC1
Unocc HT
ZoneBaud1
Unocc CL
Get From
St-By HT
RTC MAC1
St-By CL
MenuScro
Set Type
C or F
TOccTime
PIR Func
Cal RS
Lockout1
Deadband
BI1
Heat max1
RehtConf1
Cool min1
AO2RA/DA
Min Pos1
AO2 OALK1
Max Pos1
BO5 OALK1
MaxHTPos1
BO5 Time
PIHT Wei1
BO5 cont
PICL Wei1
1.
This parameter setting is critical for proper control system operation.
Technical Bulletin
59
Table 22: Zone Controller Number ( _____ )1 Commissioning
VAV Damper Actuator Properly Rigged and Verified (Opens and Closes with
Demand)?
Proper Adjustments of Zone-Side Takeoff Balancing Damper?
Proper Balancing of Zone Minimum Position?
cfm =
Proper Balancing of Zone Maximum Position?
cfm =
Proper Balancing of Zone Maximum Heat Flow
Position (If Reheat is Used)?
cfm =
Verification of Reheat (If Reheat is Used)
Maximum Change in Temperature of Reheat (If Duct Reheat is Used)
Critical Parameters Properly Set?
Zone MAC
ZoneBaud
RTC MAC
Lockout
RehtConf (If Reheat is Used)
AO2 OALK (If Reheat is Used)
BO5 OALK (If Reheat is Used)
Heat max
Cool min
Min Pos
Max Pos
MaxHTPos
PIHT Wei
Voting
Zone for
Heating?
PICL Wei
Voting
Zone for
Cooling?
Communication with the Rooftop Controller Active (Status LED and
Outside Air Temperature Display)?
1.
60
Use the Zone MAC address for the zone controller number, and repeat this checklist for all
other zone controllers in the system.
Technical Bulletin
MS/TP Bus Objects When Networked with a Supervisory
Controller
TEC2647Z-3 and TEC2647Z-3+PIR Zone Controllers
Table 23: TEC2647Z-3 and TEC2647Z-3+PIR Zone Controller MS/TP Bus Objects
When Networked with a Supervisory Controller (Part 1 of 4)
Point Name
Zone Controller Point
(Type/Address)
Range
GUI Damper Position1
AI 1
0 to 100%
Cfg Zone MAC1, 2
AV 1
4 to 127
Cfg RTC MAC1, 3
AV 2
4 to 127
Cfg AO2 OA Lock Spt4
AV 3
-40.0°F/-40.0°C to
122.0°F/50.0°C
Cfg BO5 OA Lock Spt4
AV 4
-40.0°F/-40.0°C to
122.0°F/50.0°C
Cfg Damper Min Pos4
AV 5
0 to 100%
Cfg Damper Max Pos4
AV 6
0 to 100%
Cfg Damper Max Heat Pos4
AV 7
0 to 100%
Cfg Heating Spt Limit4
AV 8
40.0°F/4.5°C to
90.0°F/32.0°C
Cfg Cooling Spt Limit4
AV 9
54.0°F/12.0°C to
100.0°F/37.5°C
Cfg Deadband4
AV 10
2.0F°/1.0C° to
5.0F°/2.5C°
GUI Occupied Heat Spt4
AV 11
40.0°F/4.5°C to
90.0°F/32.0°C
GUI Occupied Cool Spt4
AV 12
54.0°F/12.0°C to
100.0°F/37.5°C
GUI Unoccupied Heat Spt4
AV 13
40.0°F/4.5°C to
90.0°F/32.0°C
GUI Unoccupied Cool Spt4
AV 14
54.0°F/12.0°C to
100.0°F/37.5°C
GUI Standby Heat Spt4
AV 15
40.0°F/4.5°C to
90.0°F/32.0°C
GUI Standby Cool Spt4
AV 16
54.0°F/12.0°C to
100.0°F/37.5°C
GUI AO2 Status1
AV 17
0 to 100%
GUI UI3 Status1
AV 18
-40.0°F/-40.0°C to
120.0°F/49.0°C
GUI PI Heat Weighted Demand1
AV 19
0 to 100%
GUI PI Cool Weighted Demand1
AV 20
0 to 100%
GUI Room Temperature5
AV 21
-40.0°F/-40.0°C to
120.0°F/49.0°C
GUI Outdoor Temperature4
AV 22
-40.0°F/-40.0°C to
150.0°F/65.5°C
Cfg Device Instance1
AV 23
0 to 4,194,302
GUI P1 Heat Demand1
AV 24
0 to 100%
Technical Bulletin
61
Point Name
(Type/Address)
Range
GUI P1 Cool Demand1
AV 25
0 to 100%
GUI BI1 Status1, 6
BI 1
Inactive Text = Inactive (Contact Open)
Active Text = Active (Contact Closed)
GUI BI2 Status1, 6
BI 2
Inactive Text: Inactive
Active Text: Active
Cfg Temperature Scale4
BV 1
Inactive Text = °C
Active Text = °F
Cfg Menu Scroll4
BV 2
Inactive Text = No Scroll
Active Text = Scroll Active
Cfg Motion Detector Function4
BV 3
Inactive Text = Disabled
Active Text = Enabled
Cfg AO2 RA/DA4
BV 4
Inactive Text = Direct Acting (DA)
Active Text = Reverse Acting (RA)
Cfg BO5 Time Base4
BV 5
Inactive Text = 15 Minutes
Active Text = 10 Seconds
Cfg BO5 Configuration4
BV 6
Inactive Text = Normally Open (N.O.)
Active Text = Normally Closed (N.C.)
GUI BO5 Status1
BV 7
Inactive Text = Off
Active Text = On
Sta AO2 Lock Status1
BV 8
Inactive Text = Inactive
Active Text = Active
Sta BO5 Lock Status1
BV 9
GUI Room Temp Override4
BV 10
Inactive Text = Normal
Active Text = Override
Sta RTC Smart Recovery7
BV 11
Inactive Text = Off
Active Text = On
Cfg Setpoint Type
BV 12
Inactive text = Permanent
Active text = Temporary
Cfg Zone Baud1
MV 1
1 = 9600
2 = 19200
3 = 38400
4 = 76800
5 = Auto
Cfg Reheat Configuration4
MV 2
1 = None
2 = Analog Duct Reheat Only
3 = On/Off Duct Reheat Only
4 = On/Off Peripheral Reheat Only
5 = Analog Duct Reheat and
On/Off Peripheral Reheat
Cfg BI1 Configuration4
MV 3
1 = None
2 = Motion N.O.
3 = Motion N.C.
Cfg PI Heat Weight4
MV 4
1 = 0%
2 = 25%
3 = 50%
4 = 75%
5 = 100%
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Technical Bulletin
Point Name
(Type/Address)
Range
Cfg PI Cool Weight4
MV 5
1 = 0%
2 = 25%
3 = 50%
4 = 75%
5 = 100%
Cfg Temporary Occupancy Time1
MV 6
1 = 0 Hours
2 = 1 Hour
3 = 2 Hours
4 = 3 Hours
5 = 4 Hours
6 = 5 Hours
7 = 6 Hours
8 = 7 Hours
9 = 8 Hours
10 = 9 Hours
11 = 10 Hours
12 = 11 Hours
13 = 12 Hours
Cfg Network Handle4
MV 7
1 = Default Zone Handle (Supervisory
Controller Monitors the Zoning System)
2 = Default Minus Occupancy (Allows Each
Zone to be Scheduled Independently)
3 = Full Release (Supervisory Controller
Assumes Complete Control of the Zoning
System)
GUI Zone Keypad Lockout4
MV 8
1 = No Lockout
2 = Level 1
3 = Level 2
4 = Level 3
GUI Occupancy8
MV 9
1 = Local Occupancy
2 = Occupied
3 = Unoccupied
Sta RTC Zone Sequencing7
MV 10
1 = Cool
2 = Heat
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63
Point Name
(Type/Address)
Range
GUI Effective Occupancy1
MV 11
1 = Occupied
2 = Unoccupied
3 = Temporary Occupied
4 = Standby
TEC2647Z-72aaa9, 10
Device 72aaa
N/A
1.
2.
3.
4.
5.
This MS/TP Bus object is readable only.
Cfg Zone MAC is the unique device address of the zone controller (from 004 to 127) on the MS/TP network.
Cfg RTC MAC is the unique device address of the rooftop controller (from 004 to 127) on the MS/TP network.
This MS/TP Bus object is readable and writable.
This MS/TP Bus object is readable only unless GUI Room Temp Override is set to Active Text = Override, then it is
readable and writable.
6. The polarity property of this MS/TP Bus object is readable and writable.
7. This MS/TP Bus object is readable only unless Cfg Network Handle is set to 3 = Full Release, then it is readable
and writable. This MS/TP Bus object enables the occupancy setpoint at the occupied time.
8. This MS/TP Bus object is readable only unless Cfg Network Handle is set to 2 = Default Minus Occupancy or
3 = Full Release, then it is readable and writable.
9. The designation aaa is the address of the device (from 004 to 127) on the MS/TP network.
10. In the Device Object, the following properties are writable: Device Object Instance, Max_Master, and Object_Name.
Table 24: TEC2664Z-3 Rooftop Controller MS/TP Bus Objects When Networked
with a Supervisory Controller (Part 1 of 4)
Point Name
Rooftop Controller
Point (Type/Address)
Range
GUI Discharge Air Temp1
AI 1
-40.0°F/-40.0°C to
150.0°F/65.5°C
GUI Return Air Temp1
AI 2
-40.0°F/-40.0°C to
150.0°F/65.5°C
GUI Static Pressure1
AI 3
Variable Depending on the Cfg Static
Pressure Transducer Range Point Setting
GUI Bypass Damper1
AI 4
0 to 100%
Cfg RTC MAC2, 3
AV 1
4 to 127
Cfg Heating Lockout Temp2
AV 2
-15.0°F/-26.0°C to
120.0°F/49.0°C
Cfg Cooling Lockout Temp2
AV 3
-40.0°F/-40.0°C to
95.0°F/35.0°C
Cfg Static Pressure Spt2
AV 4
0 in. W.C./0 Pa to
2 in. W.C./500 Pa
Cfg Discharge High Limit Spt2
AV 5
75.0°F/24.0°C to
150.0°F/65.5°C
Cfg Discharge Low Limit Spt2
AV 6
35.0°F/2.0°C to
60.0°F/15.5°C
Cfg Return Air Occ CL Spt2
AV 7
54.0°F/12.0°C to
100.0°F/37.5°C
Cfg Return Air Unocc CL Spt2
AV 8
54.0°F/12.0°C to
100.0°F/37.5°C
Cfg Return Air Occ HT Spt2
AV 9
40.0°F/4.5°C to
90.0°F/32.0°C
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Technical Bulletin
Point Name
Rooftop Controller
Range
Cfg Return Air Unocc HT Spt2
AV 10
40.0°F/4.5°C to
90.0°F/32.0°C
GUI Current Zone PI Heat Demand1
AV 11
0 to 100%
GUI Current Zone PI Cool Demand1
AV 12
0 to 100%
GUI Transferred PI Heat Demand1
AV 13
0 to 100%
GUI Transferred PI Cool Demand1
AV 14
0 to 100%
GUI Highest PI Heat Zone1
AV 15
4 to 127
GUI Highest PI Cool Zone1
AV 16
4 to 127
GUI Highest PI Heat Demand1
AV 17
0 to 100%
GUI Highest PI Cool Demand1
AV 18
0 to 100%
GUI Outdoor Temperature1
AV 19
-40.0°F/-40.0°C to
150.0°F/65.5°C
Cfg Power Delay2
AV 20
10 to 120 Seconds
Cfg Device Instance1
AV 21
0 to 4,194,302
Cfg Deadband2
AV 22
2.0 to 4.0ºF (1.0 to 2.2ºC)
GUI G Fan1
BI 1
Inactive Text = Off
Active Text = On
GUI Y1 Cool1
BI 2
Inactive Text = Off
Active Text = On
GUI Y2 Cool1
BI 3
Inactive Text = Off
Active Text = On
GUI W1 Heat1
BI 4
Inactive Text = Off
Active Text = On
GUI W2 Heat1
BI 5
Inactive Text = Off
Active Text = On
GUI DI1 Status1
BI 6
Inactive Text = Inactive (Contact Open)
Active Text = Active (Contact Closed)
GUI Aux Status1
BI 7
Inactive Text = Off
Active Text = On
Sta Heating Stages Lockout Status1
BI 8
Sta Cooling Stages Lockout Status1
BI 9
Sta Service Alarm1
BI 10
Inactive Text = Off
Active Text = On
Sta Filter Alarm1
BI 11
Inactive Text = Off
Active Text = On
Sta Clock Alarm1
BI 12
Inactive Text = Off
Active Text = On
Sta Discharge Temp Alarm1
BI 13
Inactive Text = Off
Active Text = On
Cfg Units2
BV 1
Inactive Text = Metric Units
Active Text = Imperial Units
Technical Bulletin
65
Point Name
Rooftop Controller
Range
Cfg Progressive Recovery2
BV 2
Inactive Text = Off
Active Text = On
Sta Comm Lost Status1
BV 3
Inactive Text = Down
Active Text = Up
Cfg Aux Contact2
BV 4
Inactive Text = Normally Open (N.O.)
Active Text = Normally Closed (N.C.)
Cfg Fan Purge Delay2
BV 5
Inactive Text = Off
Active Text = On
GUI Outdoor Temp Override2
BV 6
Inactive Text = Normal
Active Text = Override
Sta Smart Recovery1
BV 7
Inactive Text = Off
Active Text = On
Cfg RTC Baud1
MV 1
1 = 9600
2 =19200
3 = 38400
4 = 76800
5 = Auto
Cfg Control Type2
MV 2
1 = Highest
2 = AV_H3
3 = AV_H5
Cfg Local Keypad Lockout2
MV 3
1 = No Lockout
2 = Level 1
3 = Level 2
GUI Zone Sequence1
MV 4
1 = Off
2 = Cool
3 = Heat
Cfg Static Pressure Transducer
Range2
MV 5
1 = 0 in. W.C./0 Pa to 1.5 in. W.C./375 Pa
2 = 0 in. W.C./0 Pa to 2 in. W.C./500 Pa
3 = 0 in. W.C./0 Pa to 3 in. W.C./750 Pa
4 = 0 in. W.C./0 Pa to 4 in. W.C./1,000 Pa
5 = 0 in. W.C./0 Pa to 5 in. W.C./1,250 Pa
Cfg Heating Stages2
MV 6
1 = One Stage
2 = Two Stages
Cfg Cooling Stages2
MV 7
1 = One Stage
2 = Two Stages
Cfg Heating cph2
MV 8
1 = 3 cph
2 = 4 cph
3 = 5 cph
4 = 6 cph
5 = 7 cph
6 = 8 cph
Cfg Cooling cph2
MV 9
1 = 3 cph
2 = 4 cph
Cfg Minimum On/Off Time2
MV 10
1 = 0 Minutes
2 = 1 Minute
3 = 2 Minutes
4 = 3 Minutes
5 = 4 Minutes
6 = 5 Minutes
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Technical Bulletin
Point Name
Rooftop Controller
Range
Cfg BI 1 Configuration2
MV 11
1 = None
2 = RemNSB
3 = Override
4 = Filter
5 = Service
Cfg Temporary Occupancy Time2
MV 12
1 = 0 Hours
2 = 1 Hour
3 = 2 Hours
4 = 3 Hours
5 = 4 Hours
6 = 5 Hours
7 = 6 Hours
8 = 7 Hours
9 = 8 Hours
10 = 9 Hours
11 = 10 Hours
12 = 11 Hours
13 = 12 Hours
Cfg Event Display2
MV 13
1 = Two Events
2 = Four Events
GUI Occupancy2, 4
MV 14
1 = Released
2 = Occupied
3 = Unoccupied
4 = Temporary Occupied
GUI System Mode2
MV 15
1 = Off
2 = Auto
GUI Schedule1
SCH1
N/A
TEC2664Z-76aaa5, 6
Device 76aaa
N/A
1.
2.
3.
4.
5.
6.
This MS/TP Bus object is readable only.
This MS/TP Bus object is readable and writable.
Cfg RTC MAC is the unique device address of the rooftop controller (from 004 to 127) on the MS/TP network.
The Schedule Object is not writable from any controller.
The designation aaa is the address of the device (from 004 to 127) on the MS/TP network.
In the Device Object, the following properties are writable: Device Object Instance, Max_Master, and Object_Name.
Technical Bulletin
67
MS/TP Device Mapping into an NAE
Preparation
Before mapping a zone controller or a rooftop controller into an NAE:
1. Decide which point objects within the zone controller and rooftop controller
need to be mapped. Only map the point objects that need to be viewed on a
regular basis, since excessive mapping lowers system performance. Suggested
Graphical User Interface (GUI), Configuration (Cfg), and Status (Sta) point
objects for mapping are included in Table 23 and Table 24. In addition,
monitoring points may be mapped if they are used. Use the Engineering view
to examine infrequently used point objects.
Note: We recommend that all zone controller and rooftop controller configuration
parameters be set as desired prior to mapping the objects into the controller.
If any zone controller or rooftop controller configuration parameters are
altered after the objects are mapped into the controller, we recommend that
all objects be remapped. We also recommend caution when mapping
configuration parameters, as they should only be mapped if the operator is
fully familiar with their use.
2. Verify that a Field Bus is defined in the NAE. BACnet MS/TP devices attach to
a Field Bus. Refer to the BACnet® MS/TP Integration with NAE Technical
Bulletin (LIT-12011013) for instructions on how to define a Field Bus.
3. For Metasys system software prior to Release 4.0, verify that a BACnet
Integration is defined for the Field Bus. The zone controller and rooftop
controller are mapped as BACnet devices under a Field Bus BACnet
Integration. Refer to the BACnet Controller Integration with NAE/NCE
Technical Bulletin (LIT-1201531) for instructions on how to define a BACnet
Integration.
Note: For Metasys system Release 4.0 or later software, this step is not
required.
At this point, the zone controller and rooftop controller (and the required point
objects inside the zone controller and rooftop controller) can be mapped.
Adding a Zone Controller
You must add the zone controller before mapping its points. To add the zone
controller, select the Field Bus or a folder under it (refresh the tree view, if
required, to see a newly added BACnet Integration) and choose Field Device from
the Insert menu.
Note: For Metasys system software prior to Release 4.0, select the BACnet
Integration under the Field Bus (refresh the tree view, if required, to see a
newly added BACnet Integration) and choose Field Device from the Insert
menu.
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Technical Bulletin
Assisted Definition using Auto Discovery is the easiest way to add a new zone
controller online; however, this method requires that the zone controller to be
added is connected and ready to communicate.
Device object names used with BACnet communication must be unique to fully
satisfy the requirements of BACnet MS/TP network guidelines. The zone
controller automatically selects a device object name for itself using the format
TEC2647Z-72aaa, where aaa designates the device address selected (from 004 to
127) on the MS/TP network. If this name needs to be changed by writing a new
one into the zone controller device object, that should be done before any point
objects are mapped. Be sure that the name of the new zone controller being added
to the NAE matches that of the zone controller itself.
Device object instances used with BACnet communication must be unique to fully
satisfy the requirements of BACnet MS/TP network guidelines. The zone
controller automatically selects a device object instance for itself using the format
72aaa, where aaa designates the device address selected (from 004 to 127) on the
MS/TP network (for example, 72004, 72005). If you need to change this instance
by writing a new one into the zone controller device object, do so before any point
objects are mapped. This number goes into the Instance Number field, Network
section, Hardware tab, of the Configure step in the Insert Field Device Wizard.
Adding a Rooftop Controller
You must add the rooftop controller before mapping its points. To add a rooftop
controller, select the Field Bus or a folder under it (refresh the tree view if required
to see a newly added BACnet Integration) and choose Field Device from the Insert
menu.
Note: For Metasys system software prior to Release 4.0, select the BACnet
Integration under the Field Bus (refresh the tree view if required to see a
newly added BACnet Integration) and choose Field Device from the Insert
menu.
Assisted Definition using Auto Discovery is the easiest way to add a new rooftop
controller online; however, this method requires that the rooftop controller to be
added is connected and ready to communicate.
Device object names used with BACnet communication must be unique to fully
satisfy the requirements of BACnet MS/TP network guidelines. The rooftop
controller automatically selects a device object name for itself using the format
TEC2664Z-76aaa, where aaa designates the device address selected (from 004 to
127) on the MS/TP network. If you need to change this name by writing a new one
into the rooftop controller device object, do so before any point objects are
mapped. Be sure that the name of the new rooftop controller being added to the
NAE matches that of the rooftop controller itself.
Technical Bulletin
69
Device object IDs used with BACnet communication must be unique to fully
satisfy the requirements of BACnet MS/TP network guidelines. The rooftop
controller automatically selects a device object ID for itself using the format
76aaa, where aaa designates the device address selected (from 004 to 127) on the
MS/TP network (for example, 76004, 76005). If you need to change this ID by
writing a new one into the rooftop controller device object, do so before any point
objects are mapped. Be sure that the ID of the new rooftop controller being added
to the NAE matches that of the rooftop controller itself. This number goes into the
Instance Number field, Network section, Hardware tab, of the Configure step in
the Insert Field Device Wizard.
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Technical Bulletin
Adding Point Objects
You must map the required point objects under the zone controller or rooftop
controller device. To accomplish this mapping, select the zone controller or
rooftop controller device under the BACnet Integration (refresh the tree view, if
required, to see a newly added zone controller or rooftop controller device), and
choose Field Point from the Insert menu.
Note: For Metasys system Release 4.0 or later software, select a Field Bus or a
folder under it.
Assisted Definition using Auto Discovery is the easiest way to add new point
objects online; however, this method requires that the zone controller or rooftop
controller to be mapped is connected and ready to communicate.
When mapping point objects, the point type must match the BACnet object type
(for example, AV, MV, or BI), and the point instance number must match the point
BACnet instance number.
Notes, Tips, and Things to Know
Multiple 24 VAC Zone Controller Transformers versus a
Single 24 VAC Zone Controller Transformer
If you are using multiple 24 VAC zone controller transformers (one transformer
for each zone controller), be certain of the following:
•
Use a 20 VA or more Class 2 self-protected transformer to power all of the
components connected to each zone controller.
•
Maintain the polarity of all of the components in the circuit, including the
analog VAV actuator, analog reheat devices, or any other equipment.
•
Ground the circuit if required. The common side of the circuit is connected to
earth (0 V ~ Com). To prevent ground loops, grounding is required at only one
location.
If a single 24 VAC zone controller transformer is used for multiple zones, be
certain of the following:
•
Size a fuse or circuit protection according to the maximum installed load if a
Class 1 unprotected transformer is used to power all of the components
connected to the zone controller. The load is not necessarily the same as the
maximum current available from the transformer. For example, if a 100 VA
transformer is installed and the maximum installed load is 45 VA for all of the
components connected to the zone controller, then the fused value should be
2 A maximum at 24 VAC. In all instances, the power supplied to the zone
controller must be Class 2.
•
Maintain the polarity of all of the components in the circuit, including the
analog VAV actuator, analog reheat devices, or any other equipment.
Technical Bulletin
71
•
Ground the circuit if required. The common side of the circuit is connected to
earth (0 V ~ Com). To prevent ground loops, grounding is required at only one
location.
Critical Point Checks
For proper and reliable control system operation, the system designer or installer
must verify and check all critical milestones of the installation. These checks
should include all other contractual aspects for the system performed outside of the
control system scope of work, including:
•
design-phase tasks such as load calculations, ductwork layout and sizing, and
equipment selection
•
construction-phase tasks such as rooftop controller installation, ductwork
installation, and required electrical work
•
commissioning/delivery-phase tasks such as system operational checkout,
damper balancing, and rooftop controller commissioning
Proper planning and design plays a critical role in getting an installation up and
running in an efficient manner, with fewer service calls during the initial
occupancy period.
Balancing and Capacity
Although it is not the function of the TEC Zoning Control System to correct for a
wrong initial mechanical layout and associated load calculations, the control
system dramatically helps deliver the load required by the voting zones. The
system appropriately distributes the total available capacity of the installed
equipment to the required voting zones. If the equipment is undersized for the peak
load, the control system distributes the available capacity according to the
priorities requested to improve the comfort level of the majority of zones.
At the zone controller level, the Min Pos, Max Pos, and MaxHTPos parameters
must be properly set during zone damper balancing. If the local VAV trunk is
equipped with a main trunk-side takeoff directional adjustment blade, additional
adjustments are also required.
Occupancy Operation
Users are able to override the entire occupancy status of the TEC Zoning Control
System from the rooftop controller. When keypad lockout Level 0 or Level 1 is
enabled and the user presses the Override key, the occupancy object of the rooftop
controller changes to Temporary Occupied. All associated zone controllers with
their network handle set to Default Zone Handle also have their occupancy object
change to Temporary Occupied.
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Technical Bulletin
Occupancy Schedule
When viewing the rooftop controller schedule from the User Interface, the screen
may initially appear as scrambled. If this condition occurs, simply click the left
mouse button and the screen refreshes properly. It may be necessary to assign text
to the states of the schedule. If this is the case, assign Ordinal 2 to Occupied and
Ordinal 3 to Unoccupied via the Facets button of the Property Sheet.
For proper display when viewing the rooftop controller schedule from the
NAE User Interface, check that the schedule for each day does not have identical
Occupied and Unoccupied times. For example, a day that has both the Occupied
and Unoccupied times scheduled for 12:00 A.M. does not display correctly. If the
states of the displayed schedule do not show as Occupied and Unoccupied, it may
be necessary to edit the states text and default schedule command. It may take a
few minutes for the revised schedule to display at the NAE User Interface,
following schedule updates at the rooftop controller.
Scheduled commands that cross over midnight may show a gray background for
the next day. This gray background represents the continuation of the command
that existed prior to midnight.
NAE Engineering View
When viewing summary data for a rooftop controller or a zone controller via the
Engineering view, some or all of the following device properties may be omitted
from the display:
•
Max Master
•
Max Info Frames
•
Device Addr Binding
•
Database Revision
•
Protocol Revision
Troubleshooting a TEC Zoning Control System
Table 25: Troubleshooting Details1 (Part 1 of 5)
Symptom
Probable Cause
Solution
Loss of Control or
Poor Control at
Multiple Zones
Duplicate Media Access
Control (MAC) Addresses
Are Interrupting
Communications
Check all devices on the network for unique MAC addresses.
Wiring Errors Are
Interrupting
Communications
Check connections and continuity.
Technical Bulletin
73
Symptom
Probable Cause
Solution
Loss of Control or
Poor Control at
Multiple Zones
Zone Controllers Are
Disconnected or Offline
Cycle the power on the zone controllers (in case the MAC address
was changed without a reset).
Remove the cover of the zone controllers and observe that the
green LED on the communication module is flashing repeatedly
(short-short-long). If the communication module appears to be out of
service:
• check that it is properly attached to the main thermostat circuit
board
• check that the communication cable is properly installed
Rooftop Controllers Are
Cycle the power on the rooftop controllers (in case the MAC address
Check for the Comm Lost alarm at the rooftop controller.
All Units on the Network
Are Set to Auto Baud
Select one MS/TP master unit on the network (preferably the rooftop
controller or a supervisory controller) to operate at a specific baud
rate.
One or More Units on the
Network Are Set to
Specific but Conflicting
Baud Rates
Check that all of the units not set to Auto Baud have the same baud
rate selected.
Improper Rooftop
Controller Parameters
Review all parameters against the system design.
Insufficient Airflow from
the Rooftop Unit
Check the installation and configuration of the bypass damper.
Check the static pressure setpoint and transducer.
Check the fan control wiring.
Check for the proper fan delay configuration at the rooftop controller.
Check for a fan malfunction.
Rooftop Unit
Heating/Cooling Stage
Malfunction
Check for proper operation of all rooftop heating/cooling stages.
Check for proper number and sizing of the stages.
Check all wiring.
Check the discharge air lockout temperature.
Check the discharge air sensor.
Check for the proper anti-cycle configuration at the rooftop controller
and other equipment.
74
Inappropriate Modification
of the Rooftop Controller
or Zone Controller
Configuration by the
Supervisory Controller
Set the password access at the supervisory controller to restrict
access to authorized personnel.
Inappropriate Modification
of the Rooftop Controller
or Zone Controller by an
Unauthorized User
Review the configuration parameters against the system design.
Alternate Control Scheme
is Active with Faulty or
Missing Input (Active
when the Rooftop
Controller Loses All
Communications)
Replace or repair the missing, inaccurate, or wrong return air
sensor.
Alternate Control Scheme
is Active with
Inappropriate Setpoints
Check and reenter the setpoints if needed.
Do not map sensitive configuration parameters into the supervisory
controller.
Fix or relocate the inaccurate or poorly placed rooftop controller
integral temperature sensor.
Technical Bulletin
Symptom
Probable Cause
Solution
Loss of Control or
Poor Control at
Multiple Zones
Inappropriate Discharge
Air Sensor Configuration
If heating/cooling lockout based on the discharge air is desired,
properly install a rooftop controller discharge air sensor and properly
set the discharge air low-limit and discharge air high-limit
parameters.
Inappropriate Outside Air
Sensor Configuration
It heating/cooling lockout based on the outside air is desired,
properly install an outside air temperature discharge air sensor, and
properly set the cooling lockout and heating lockout parameters.
Zone Controller MAC
Address (Associated with
the Rooftop Controller) Is
not Changed from Its
Default
Confirm that each zone controller is associated with the desired
rooftop controller.
Zone Controller MAC
Set to No Device or
Non-Rooftop Controller
Device
rooftop controller.
Zone Controller MAC
Set to the Incorrect
Rooftop Controller
rooftop controller.
Zone Controller MAC
Address Is Set in the
Range of 128 through
254
Confirm that each zone controller has a unique MAC address in the
range of 4 through 127.
Zone Controllers Are
Cycle the power on the zone controllers (in case the MAC address
Loss of Control or
Poor Control at a
Single Zone
Remove the cover of the zone controllers and observe that the
green LED on the communication module is flashing repeatedly
(short-short-long). If the communication module appears to be out of
service:
• check that it is properly attached to the main thermostat circuit
board
• check that the communication cable is properly installed
Zone Controller Damper
Malfunction
Check the damper installation.
Incorrect Zone Sequence
for the Zone Demand
Check if the zone is paired with a drastically different zone (for
example, one zone mostly paired with another zone mostly in
shade).
Check the damper minimum position and the damper maximum
position parameters.
Check the PI weighting of the zone.
Check for a faulty zone sensor or poor placement of the sensor.
Check for proper placement of the zone controller (for example, no
holes in the wall or not placed in the air stream).
Insufficient (or Missing)
Reheat
Check that the specified reheat is sufficient for the zone.
Incorrectly Installed or
Configured Reheat
Check the configuration for installed reheat.
Check the AO2 OALK and BO5 OALK parameters on the zone
controller.
Check the wiring.
Check the MaxHTPos parameter on the zone controller.
Technical Bulletin
75
Symptom
Probable Cause
Solution
Loss of Control or
Poor Control at a
Single Zone
Improper Zone Controller
Configuration Parameters
Review the configuration parameters against the system design.
PI Weighting Is Incorrect
Evaluate the heating and cooling weighting parameters for the zone.
Cannot Modify the
Occupied
Setpoints at the
Zone Controller
Keypad
Lockout Is Set to 3
Change the lockout level to either 0, 1, or 2.
No Response (or
Inadequate
Response) to the
Zone Controller
Occupancy
Override
Wrong Override Strategy
Is Configured
Check that the zone controller lockout level is set to 1 if local
override is desired.
Note: Local override attempts to reach the occupied setpoints
without requesting any additional cooling or heating from the
rooftop controller.
Zone Standby
Setpoints Are Not
Used When
Expected
The PIR Func Parameter
Is Not Configured
Properly or the PIR
Device Is Not Installed
Properly
Configure the PIR Func parameter properly.
The BI1 Parameter Is Not
Configured Properly or
the Motion Detector Is
Not Installed Properly
Check that the PIR Func parameter is set to off.
Zone Continues to
Use Standby
Setpoints When
the Zone Is
Occupied
The PIR Device or the
Motion Detector Is Not
Installed or Functioning
Properly
Check the installation and function of the PIR device and the motion
detector.
Cannot Access the
Occupancy
Schedule at the
Rooftop Controller
Keypad
Lockout Is Set to 2
Change the lockout level to 0.
Cannot Change
the System Mode
at the Rooftop
Controller Keypad
Lockout Is Set to 1 or 2
Change the lockout level to 0.
Zones Are Not
Following the
Rooftop Controller
Occupancy
Schedule
Wrong Network Handle Is
Written to the Zone
Controller
Write the correct network handle to the zone controller.
Note: The network handle is only written via the supervisory
controller; not the zone controller installer configuration menu.
Cannot Start or
Cancel the System
Occupancy at the
Rooftop Controller
Keypad
Lockout Is Set to 2
76
If Get From service was used to configure the zone controller,
confirm that configuration parameters of the source zone controller
are correct.
Check that the zone controller lockout level is set to 0 if global
override is desired.
Note: Global override causes the rooftop controller to consider the
demand of the zone when determining the zone sequence.
Install the PIR device properly.
Check that the BI1 parameter is configured properly.
Install the motion detector properly.
Verify that the DI1 parameter is not set to remote night setback.
rooftop controller.
Change the lockout level to 0 or 1.
Technical Bulletin
Symptom
Probable Cause
Solution
Zones Are Not
Following the
Supervisory
Controller
Occupancy
Schedule
Wrong Network Handle Is
Written to the Zone
Controller
Write the correct network handle to the zone controller.
The network handle is only written via the supervisory controller, not
the zone controller installer configuration menu.
No Progressive
Recovery
Progressive Recovery Is
Not Functioning
Check that the Prog rec parameter is set to on.
Check if the gap between schedule events is less than 90 minutes.
Note: If progressive recovery is desired, the system must be in the
unoccupied mode for more than 90 minutes.
Check that the occupied heating setpoint is less than the
unoccupied heating setpoint, and that the occupied cooling setpoint
is greater than the unoccupied cooling setpoint.
Check if the rooftop controller is offline and is attempting progressive
recovery using return air control. If network communication is lost,
the return air sensor controls the rooftop controller to maintain the
heating and cooling setpoints. Check that the occupied heating
setpoint is less than the unoccupied heating setpoint, and that the
occupied cooling setpoint is greater than the unoccupied cooling
setpoint.
Supervisory
Controller Cannot
Control
---
Check the wiring.
Check for failure of auto discovery or manual definition of the rooftop
controllers and zone controllers.
Check for incorrect network handle.
Not All
Configuration
Parameters Are
Visible at the Zone
Controller
1.
The Get From Parameter
Is Set to a Value Other
Than 255
Change the Get From parameter to 255, until a baud rate is
established on the network.
For common MS/TP troubleshooting information, refer to the MS/TP Communications Bus Technical Bulletin
(LIT-12011034).
Building Efficiency
507 E. Michigan Street, Milwaukee, WI 53202
Metasys® and Johnson Controls® are registered trademarks of Johnson Controls, Inc.
All other marks herein are the marks of their respective owners. © 2011 Johnson Controls, Inc.
Technical Bulletin
Published in U.S.A.
77
www.johnsoncontrols.com

TEC Zoning Control System for Stand-Alone and

Transcription

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