Installation and Operation Tracer ZN517 Unitary Controller - Cul-tech

Transcription

Installation and
Operation
Tracer™ ZN517
Unitary Controller
CNT-SVX12C-EN
April 2005
Tracer ZN517 Unitary Controller Installation and Operation
This guide and the information in it are the property of American Standard Inc. and may not be used or reproduced in whole or in part,
without the written permission of American Standard Inc. Trane, a business of American Standard, Inc., has a policy of continuous
product and product data improvement and reserves the right to change design and specification without notice.
Although Trane has tested the hardware and software described in this guide, no guarantee is offered that the hardware and software
are error free.
Trane reserves the right to revise this publication at any time and to make changes to its content without obligation to notify any person of such revision or change.
Trane may have patents or patent applications covering items in this publication. By providing this document, Trane does not imply
giving license to these patents.
™®
The following are trademarks or registered trademarks of Trane: Trane, Tracer, Tracker, Rover.
™®
The following are trademarks or registered trademarks of their respective companies or organizations: LonTalk and Neuron
from Echelon Corporation.
Printed in the U.S.A.
© 2005 American Standard Inc. All rights reserved.
CNT-SVX12C-EN
NOTICE:
Warnings and Cautions appear at appropriate sections throughout this manual. Read these carefully:
WARNING
Indicates a potentially hazardous situation, which, if not avoided, could result in death or serious injury.
CAUTION
Indicates a potentially hazardous situation, which, if not avoided, may result in minor or moderate injury.
It may also be used to alert against unsafe practices.
CAUTION
Indicates a situation that may result in equipment damage or property damage.
The following format and symbol conventions appear at appropriate sections throughout this manual:
IMPORTANT
Alerts installer, servicer, or operator to potential actions that could cause the product or system to
operate improperly but will not likely result in potential for damage.
Note:
A note may be used to make the reader aware of useful information, to clarify a point, or to describe
options or alternatives.
◆
This symbol precedes a procedure that consists of only a single step.
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Table of contents
Chapter 1 Overview and specifications . . . . . . . . . . . . . . . . . . 1
Product description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Operating environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Storage environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Agency listing/compliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Factory default temperature setpoints . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Additional components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Power transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Zone temperature sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Discharge air temperature sensors. . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Damper actuators (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Chapter 2 Mounting the controller . . . . . . . . . . . . . . . . . . . . . 7
Location recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Mounting recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Chapter 3 Applications for the
2-heat/2-cool configuration. . . . . . . . . . . . . . . . . . 9
Wiring requirements and options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
DIP switch settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Binary outputs for 2-heat/2-cool applications . . . . . . . . . . . . . . . . . . . . 13
Binary output 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Overriding binary outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Binary inputs for 2-heat/2-cool applications. . . . . . . . . . . . . . . . . . . . . . 14
BI1: Occupancy or generic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
BI2: Fan status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
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Table of contents
Analog inputs for 2-heat/2-cool applications . . . . . . . . . . . . . . . . . . . . . 15
AI1: Universal 4–20 mA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
AI2: Outdoor air temperature or generic temperature . . . . . . . . . . 17
DAT: Discharge air temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
ZN: Zone temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
SET: Temperature setpoint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Chapter 4 Sequence of operations for the 2-heat/2-cool
configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Power-up sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Cascade zone control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Simplified zone control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Occupancy modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Occupied mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Unoccupied mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Occupied standby mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Occupied bypass mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Timed override control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Outdoor air damper operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Fan operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Peer-to-peer communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Economizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Discharge air tempering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Demand control ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Unit protection strategies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Filter-maintenance timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Fan off delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Fan status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Chapter 5 Applications for the 4-cool configuration . . . . . . 27
Binary outputs for 4-cool applications . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Binary output 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Binary inputs for 4-cool applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
BI1: Occupancy or generic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
BI2: Fan status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Analog inputs for 4-cool applications . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
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AI1: Universal 4–20 mA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
DAT: Discharge air temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
SET: Temperature setpoint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Chapter 6 Sequence of operations for the 4-cool
configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Power-up sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Cascade zone control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Occupancy modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Occupied mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Unoccupied mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Timed override control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Outdoor air damper operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Fan operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Economizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Discharge air tempering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Unit protection strategies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Fan off delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Fan status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Chapter 7 Applications for the heat pump configuration . . 45
Binary outputs for heat pump applications . . . . . . . . . . . . . . . . . . . . . . 49
Binary output 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Binary inputs for heat pump applications . . . . . . . . . . . . . . . . . . . . . . . 50
BI1: Occupancy or generic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
BI2: Fan status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Analog inputs for heat pump applications . . . . . . . . . . . . . . . . . . . . . . . 51
AI1: Universal 4–20 mA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
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Table of contents
DAT: Discharge air temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
SET: Temperature setpoint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Chapter 8 Sequence of operations for the heat pump
configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Power-up sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Cascade zone control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Occupancy modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Occupied mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Unoccupied mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Timed override control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Outdoor air damper operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Heating or cooling mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Fan operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Compressor operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Reversing valve operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Economizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Discharge air tempering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Unit protection strategies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Fan off delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Fan status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Chapter 9 PID control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
What PID loops do. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
PID calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Proportional calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Integral calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Derivative calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Sampling frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
PID loop action . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Direct action . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
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Table of contents
Reverse action . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Error deadband . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Adjusting error deadband for modulating outputs . . . . . . . . . . . . . 69
Adjusting error deadband for staged outputs . . . . . . . . . . . . . . . . . 69
Other PID settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Troubleshooting procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Tips for specific problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Changing the sampling frequency . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Changing the gains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Chapter 10 Status indicators for operation and
communication. . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Test button. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Manual output test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Service Pin button. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Interpreting LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Diagnostic types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Table of diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Chapter 11 General wiring information . . . . . . . . . . . . . . . . . . 81
Input/output terminal wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Wiring specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
HVAC unit electrical circuit wiring . . . . . . . . . . . . . . . . . . . . . . . . . . 82
AC power wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Communication-link wiring and addressing . . . . . . . . . . . . . . . . . . . . . 86
Chapter 12 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Initial troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Diagnosing operational problems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
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Chapter 1
Overview and specifications
This guide provides installation and configuration information for the
Tracer ZN517 unitary controller, as well as a description of its operations.
The overview includes a product description, specifications, and descriptions of ancillary products that may be necessary.
Product description
The Tracer ZN517 is an application-specific controller that provides
direct digital, zone temperature control. The controller can operate as a
stand-alone device or as part of a building automation system (BAS).
Communication between the controller and a BAS occurs via a LonTalk
communication link, which is based on the LonTalk® protocol.
The controller is designed to be field-installed and is sent from the factory
configured for a 2-heat/2-cool application. You can change this configuration using the DIP switches located on the circuit board. The Tracer
ZN517 supports the following three configurations:
•
•
•
2-heat/2-cool with optional economizer control
4-cool with optional economizer control
Heat pump with optional economizer control
Features such as discharge air tempering and demand control ventilation
can be configured using the Rover service tool.
Note:
For information about using the Rover service tool, see the
Rover Operation and Programming guide (EMTX-SVX01BEN).
Dimensions
Plastic-cover model dimensions
For complete dimensional drawing, see Figure 1 on page 3.
•
•
•
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Height: 5.375 in. (137 mm)
Width: 6.875 in. (175 mm)
Depth: 2 in. (51 mm)
1
Chapter 1 Overview and specifications
Metal-cover model dimensions
For complete dimensional drawing, see Figure 2 on page 3.
•
•
•
Height: 9.0 in (25 mm)
Width: 10.37in. (263 mm)
Depth: 2.25 in. (58 mm)
Clearances
For wiring, ventilation, and maintenance, provide the following minimum
clearances for the module:
Plastic-cover model
(see Figure 1 on page 3)
•
•
•
Front: 4.0 in. (102 mm)
Each side: 1.0 in. (25 mm)
Top and bottom: 4.0 in. (102 mm)
Metal-cover model
(see Figure 2 on page 3)
•
•
•
Front: 24.0 in. (610 mm)
Each side: 2.0 in. (51 mm)
Top and bottom: 1.0 in. (25 mm)
Power
The transformer must meet the following minimum requirements for the
controller and its output devices:
•
•
•
19–30 Vac (24 Vac nominal)
50/60 Hz
9 VA and 12 VA maximum per binary output utilized
Operating environment
Operate a Tracer ZN517 unitary controller in an indoor environment that
meets the following requirements:
•
•
2
Temperature: From –40°F to 160°F (–40°C to 70°C)
Relative humidity: From 5–90%, noncondensing
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Operating environment
Figure 1. Plastic-cover model dimensions and clearances
1 in.
(25 mm)
4 in
(102 mm)
4 in
(102 mm)
5.625 in
(143 mm)
6.31 in.
(160 mm)
4 in
(102 mm)
6.875 in
(175 mm)
5.375 in (137 mm)
2 in. (51 mm)
Clearances
Dimensions
Figure 2. Metal-cover model dimensions and clearances
1 in.
(25 mm)
1. 875 in.
(48 mm)
6.5 in.
(165 mm)
0.28 in.
(7 mm)
9 in.
(229 mm)
9 in.
(229 mm)
7 in.
(178 mm)
2 in.
(51 mm)
2 in.
(51 mm)
24 in.
(610 mm)
10.37 in.
(263 mm)
width with cover
Clearances
Dimensions
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1 in.
(25 mm)
1 in.
(25 mm)
2.25 in.
(58 mm)
10.25 in.
(260 mm)
width without cover
3
Storage environment
If you are storing a Tracer ZN517 unitary controller for a substantial
amount of time, store it in an indoor environment that meets the
following requirements:
•
•
Temperature: From –40° to 185°F (–40° to 85°C)
Relative humidity: From 5–95%, noncondensing
Agency listing/compliance
CE—Immunity: EN50082-2:1995
EN61000-6-2:1999
CE—Emissions: EN61000-3-2:1995
EN61000-3-3:1995
EN50081-1:1992 (CISPR 22)
EN55011:1998, Class B
UL and C-UL 916 listed:
Energy management equipment
UL 94-5V (UL flammability rating for plenum use)
FCC Part 15, Class A, CFR 47
Factory default temperature setpoints
The Tracer ZN517 unitary controller relies on a number of temperature
setpoints to control HVAC equipment. Table 1 gives the factory defaults
for these setpoints, which can all be edited with the Rover service tool or a
BAS.
Table 1. Factory default temperature setpoints
Setpoints
Factory defaults
°F (°C)
Default setpoints
Occupied cooling
74.0°F (23.3°C)
Occupied standby cooling
78.0°F (25.6°C)
Unoccupied cooling
85.0°F (29.4°C)
Occupied heating
71.0°F (21.7°C)
Occupied standby heating
67.0°F (19.4°C)
Unoccupied heating
60.0°F (15.6°C)
Occupied setpoint limits
4
Cooling setpoint high limit
110.0°F (43.3°C)
Cooling setpoint low limit
40.0°F (44.4°C)
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Factory default temperature setpoints
Table 1. Factory default temperature setpoints
Setpoints
Factory defaults
°F (°C)
Heating setpoint high limit
105.0°F (40.6°C)
Heating setpoint low limit
40.0°F (44.4°C)
Discharge air limits
High limit
170.6°F (77.0°C)
Low limit
37.4°F (3.0°C)
Control point high limit
150.8°F (66.0°C)
Control point low limit
44.6°F (7.0°C)
Outdoor air damper setup
Economizer enable temperature
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53.6°F (12.0°C)
5
Additional components
The following components are required for proper equipment operation.
They are not included with the Tracer ZN517 unitary controller. Additional components may also be required besides those described in this
section, depending on your application.
Power transformer
A transformer providing 24 Vac is required to power the Tracer ZN517
unitary controller and associated output relays and valve and damper
actuators (see “AC power wiring” on page 85).
Zone temperature sensors
Table 2 shows some of the Trane zone temperature sensors that are supported by the Tracer ZN517 unitary controller. Contact your Trane sales
office for information about other compatible zone sensors.
Table 2. Trane zone temperature sensor options
Timed override
buttons
Zone
BAS order
number
4190 1086
Comm
jack
Setpoint
thumbwheel
Temperature
sensor
On
x
x
x
4190 1087
x
4190 1088
x
x
4190 1089
x
x
x
4190 1090
x
x
4190 1094
x
x
4190 7015
(stainless
steel wall
plate)
Cancel
x
x
x
x
x
x
Discharge air temperature sensors
Discharge air temperature sensors must be Trane 10 kΩ (at 25°C) thermistors. The discharge air temperature (DAT) input may use a sealed
temperature sensor (part number 4190 1100) or a duct/immersion temperature sensor (part number 4190 1103).
Damper actuators (optional)
Actuators cannot exceed 12 VA draw at 24 Vac. Use actuators with on/off
action and spring return (to normally open or closed position), based on
the desired default position.
6
CNT-SVX12C-EN
Chapter 2
Mounting the controller
This chapter gives recommendations and requirements for mounting the
Tracer ZN517 unitary controller.
Location recommendations
For rooftop and heat pump applications, the controller can be mounted
inside the unit or at a convenient location inside the building. Trane
recommends locating the Tracer ZN517 unitary controller:
•
•
•
CNT-SVX12C-EN
Near the controlled piece of equipment to reduce wiring costs
Where it is easily accessible for service personnel
Where public access is restricted to minimize the possibility of tampering or vandalism
7
Chapter 2 Mounting the controller
Mounting recommendations
Mounting recommendations are as follows:
IMPORTANT
Mount the Tracer ZN517 unitary controller with the cover on to avoid
the possibility of damaging the circuit board during installation.
•
•
•
•
Mount the controller in any direction, other than with the front of the
cover facing downward.
Mount using the two 3/16 in. (4.8 mm) radius mounting holes provided
(see Figure 3). Mounting fasteners are not included.
Attach the controller securely so it can withstand vibrations of associated HVAC equipment.
When the controller is mounted in a small enclosed compartment,
complete all wiring connections before securing the controller in the
compartment.
Figure 3. Mounting the Tracer ZN517 unitary controller
8
CNT-SVX12C-EN
Chapter 3
Applications for the
2-heat/2-cool configuration
This chapter provides information for wiring input and output terminals
and setting DIP switches for typical 2-heat/2-cool applications. The function of inputs and outputs is also defined for these applications.
The types of 2-heat/2-cool applications supported by the Tracer ZN517
unitary controller are:
•
•
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Rooftop units with or without economizers
Split systems with or without economizers
9
Chapter 3 Applications for the 2-heat/2-cool configuration
Wiring requirements and options
Table 3 shows required controller inputs for minimal proper operation of
all 2-heat/2-cool applications.
Table 3. Required controller inputs for all 2-heat/2-cool applications
Function
Input source
For more information,
see:
24 Vac power
Terminals: GND, 24 V
“AC power wiring” on
page 85
Zone temperature
Terminals: ZN, GND
or communicated
“ZN: Zone temperature” on page 18
Table 4 shows optional controller inputs and outputs for specific
applications.
Table 4. Optional controller inputs and outputs for specific applications
Application
Economizing
Input/Output
Input:
DAT (discharge air temperature)
see:
“Economizing” on
page 23
Input:
AI2 (outdoor air temperature)
Outputs:
24 V (24 Vac common)
OPN (binary output)
CLS (binary output)
Discharge air
tempering*
Input: DAT
“Discharge air tempering” on page 24
Demand control
ventilation*
Input:
AI1 (CO2 sensor)
“Demand control
ventilation” on
page 24
Cascade control
Input: DAT
“Cascade zone control” on page 20
* In order to use this function, the economizing function must be enabled.
Figure 4 on page 11 shows a wiring diagram for the Tracer ZN517 that
includes all required and all optional components for 2-heat/2-cool applications.
10
CNT-SVX12C-EN
Figure 4. Wiring diagram for 2-heat/2-cool applications
Power*
Fan
Tri-state
modulating
economizer
(optional)
Compressor 1 contactor
Heat stage 1
Common
Heat stage 2
24 Vac H
N
R
GND 24V GND 24V GND 24V OPN CLS
AC POWER AC OUT
SERVICE
LED
PIN
B
A
Rh
-BI1-
1
2
3
-BI2-
GND +20 AI1
-AI2-
Generic binary output (optional)
4 5NO 5COM 5NC STATUS
LED
BINARY OUTPUT
ZONE SENSOR
ANALOG INPUTS
BINARY INPUTS
B
G
HVAC UNIT
ECONOMIZER
COMM5
A
Rc
Y1 Y2 W1 W2
G
-DAT-
ZN GND SET
COMM5
LED
LonTalk
In
GND
+
1
_
2
3
Out
*Terminals Rc and Rh are provided as
inputs for 24 Vac power from the controlled device. If the device has a separate heating and cooling units, use Rh
for heat and Rc for cooling. If combined, use only Rc (see “HVAC unit
electrical circuit wiring” on page 82).
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Typical 3-wire
sensor
(optional)
Occupancy
or generic
(optional)
(optional)
Fan status
(default:
normally closed
Dry contacts closed = no flow
open = flow)
only
or generic
Discharge air
temperature
LonTalk
4
5
On
Cancel
Outdoor air
temperature
(optional)
11
DIP switch settings
Set the DIP switches on the circuit board for the 2-heat/2-cool configuration. The correct settings are shown in Figure 5.
Figure 5. DIP switch settings for the 2-heat/2-cool configuration
ON DIP
2-heat/2-cool
without economizer
1 2 3 4
ON DIP
1 2 3 4
ON DIP
2-heat/2-cool with
economizer
1 2 3 4
12
CNT-SVX12C-EN
Binary outputs for 2-heat/2-cool applications
Binary outputs for 2-heat/2-cool
applications
This configuration supports rooftop units and split systems applications
that have the following components:
•
•
•
•
•
•
•
Economizer
Supply fan
Cool 1
Cool 2
Heat 1
Heat 2
Exhaust
The Tracer ZN517 controller has eight binary outputs. Each binary output is a relay with a rating of 12 VA. Table 5 describes the function of
each output for 2-heat/2-cool applications.
Table 5. Binary outputs for 2-heat/2-cool applications
Binary output terminal label
OPN
CLS
G
Function
Economizer, drive open
Economizer, drive closed
Supply fan
1 (Y1)
Cool stage 1
2 (Y2)
Cool stage 2
3 (W1)
Heat stage 1
4 (W2)
Heat stage 2
5NO/5COM/5NC (binary output 5)
Exhaust fan/occupancy/generic
Binary output 5
Use the Rover service tool to configure binary output 5 (5NO/5COM/5NC)
in one of the following ways. It is the only output that can be configured
as a generic binary output.
•
•
•
•
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Not used.
Exhaust fan: Will energize when the economizer outside air damper
position is greater than the user-defined control point.
Occupancy: Will energize when the Tracer ZN517 is in the occupied
mode.
Generic: Can be monitored only by a BAS and has no direct effect on
Tracer ZN517 operation.
13
Overriding binary outputs
Use the manual output test to manually control the outputs in a defined
sequence. For more information about the manual output test, see “Manual output test” on page 74.
Binary inputs for 2-heat/2-cool
applications
The Tracer ZN517 unitary controller has two binary inputs. Each binary
input associates an input signal of 0 Vac with open contacts and 24 Vac
with closed contacts. Table 6 gives the function of each binary input for
2 heat/2 cool applications. Each function is explained in the succeeding
paragraphs. For an explanation of the diagnostics generated by each
binary input, see “Table of diagnostics” on page 79. For more information
about how the controller operates, see Chapter 4, “Sequence of operations
for the 2-heat/2-cool configuration”.”
Table 6. Binary inputs for 2-heat/2-cool applications
Binary input
terminal label
Function
BI1
Occupancy or generic
BI2
Fan status
BI1: Occupancy or generic
The function of the occupancy input is to save energy by increasing the
range of zone setpoints when the zone is unoccupied. BI1 is used for two
occupancy-related functions. For stand-alone controllers, this binary
input can be hard-wired to a binary switch, clock, or occupancy sensor to
determine the occupancy mode—either occupied or unoccupied. For controllers receiving a BAS-communicated occupancy request, the function of
BI1 is to change the mode from occupied to occupied standby. (For more
information on occupancy-related functions, see “Occupancy modes” on
page 20.) An occupancy sensor with a binary output may be used.
BI1 is the only input that can be configured as a generic binary input.
When configured as a generic binary input, it can be monitored only by a
BAS, and has no direct effect on Tracer ZN517 operation.
BI2: Fan status
The fan status input provides feedback to the controller regarding the
fan’s operating status. If BI2 is wired to a fan status switch and the input
indicates that the fan is not operating when the controller has the fan
controlled to on, the controller will generate a Local Fan Switch Failure
diagnostic. (For more information, see “Fan status” on page 25.)
14
CNT-SVX12C-EN
Analog inputs for 2-heat/2-cool applications
Analog inputs for 2-heat/2-cool
applications
The Tracer ZN517 controller has five analog inputs. Table 7 describes the
function of each input for 2-heat/2-cool applications. Each function is
explained in the succeeding paragraphs. For an explanation of the diagnostics generated by each analog input, see “Table of diagnostics” on
page 79. For more information about how the controller operates, see
Chapter 4, “Sequence of operations for the 2-heat/2-cool configuration”.
Table 7. Analog inputs for 2-heat/2-cool applications
Analog input
terminal label
Function
AI1
Universal analog input
AI2
Outdoor air temperature
DAT
Discharge air temperature
ZN
Zone temperature (required)
SET
Temperature setpoint
Note:
Use a GND terminal as the common ground for all zone sensor
analog inputs. See Figure 4 on page 11.
AI1: Universal 4–20 mA
The AI1 analog input can be configured in one of the three ways shown in
Table 8.
Table 8. AI1 configuration options and associated measurement ranges
Configuration
Measurement range
Generic 4–20 mA input
0–100%
(4 mA=0%; 20 mA=100%)
CO2 measurement
0–2000 ppm
(4 mA=0 ppm; 20 mA=2000 ppm)
Relative humidity (RH) measurement
0–100%
(4 mA=0% RH; 20 mA=100% RH)
If this input is not needed for an application, configure it as Not Used.
This disables the generation of diagnostics.
Note:
AI1 is polarity sensitive.
For the generic input configuration, a 4–20 mA sensor must be hardwired to the AI1 terminal. (Wiring is dependent on the specific applica-
CNT-SVX12C-EN
15
tion.) The sensor communicates a value of 0–100% to the BAS. This configuration has no direct effect on Tracer ZN517 operation.
For the CO2 measurement configuration, a 4–20 mA sensor must be hardwired to the AI1 terminal as shown in Figure 6. The sensor will transmit
a 0–2000 ppm value to the BAS. This configuration has no direct effect on
Tracer ZN517 operation. If a valid value is established and then is no
longer present, the controller generates a CO2 Sensor Failure diagnostic.
Figure 6. AI1 terminal wiring: CO2 measurement
GND +20 AI1
Tracer ZN517
{
24 Vac
CO2 sensor
(Trane part number:
4190 4100 or 4190 4101)
24 Vac GND
Out
For the RH measurement configuration, a hard-wired 4–20 mA zone
humidity sensor (see Figure 7) must provide a value to the controller. If a
valid hard-wired or communicated relative humidity value is established
and then is no longer present, the controller generates an RH Sensor Failure diagnostic and disables the dehumidification function. The RH sensor
is used only to provide a valid humidity reading to a BAS; it does not
affect the operation of the Tracer ZN517.
Figure 7. AI1 terminal wiring: RH measurement
GND +20 AI1
Tracer ZN517
RH sensor
+ –
Figure Note:
The +20 terminal provides 20 ±2 Vdc that is used to power a Trane RH sensor (part
numbers 4190 1109, 4190 7011, 4190 7012, 4190 7014).
16
CNT-SVX12C-EN
Analog inputs for 2-heat/2-cool applications
AI2: Outdoor air temperature or generic temperature
The AI2 analog input can functions as either:
•
•
An outdoor air temperature input
A generic temperature input
If AI2 is configured as the local (hard-wired) outdoor air temperature
input, the controller receives the temperature as a resistance signal from
a 10 kΩ thermistor wired to analog input AI2. An outdoor air temperature value communicated by means of a LonTalk link can also be used for
controllers operating on a BAS. If both hard-wired and communicated
outdoor air temperature values are present, the controller uses the communicated value.
If you set DIP switch 3 to ON for economizing (see “DIP switch settings”
on page 12), you automatically configure AI2 as an outdoor air temperature input. Economizing (free cooling) is a function whereby outdoor air is
used as a source of cooling before hydronic or DX cooling is used. The
Tracer ZN517 uses the outdoor air temperature value to determine
whether economizing is feasible. Economizing is not possible without a
valid outdoor air temperature. (For more information, see “Economizing”
on page 23.)
If AI2 is configured as a generic temperature input, it can be monitored
by a BAS. The controller receives the temperature as a resistance signal
from a 10 kΩ thermistor wired to analog input AI2. The generic temperature input can be used with any Trane 10 kΩ thermistor. The thermistor
can be placed in any location and has no effect on the operation of the controller. If you set DIP switch 3 to OFF (see “DIP switch settings” on
page 12), you automatically configure AI2 as a generic temperature input.
Note:
AI2 is not polarity sensitive; you can connect either terminal to
either sensor lead.
DAT: Discharge air temperature
The DAT analog input functions as the local discharge air temperature
input. The controller receives the temperature as a resistance signal from
a 10 kΩ thermistor wired to analog input DAT. The thermistor is typically
located downstream from all unit heating and cooling coils at the unit discharge area.
Trane recommends the use of a discharge air temperature sensor to utilize the cascade control function (see “Cascade zone control” on page 20).
Cascade control is a more accurate method of temperature control. If no
discharge air temperature sensor is used, the controller will default to
control based solely on the zone temperature (see “Simplified zone control” on page 20).
Note:
DAT is not polarity sensitive; you can connect either terminal
to either sensor lead.
CNT-SVX12C-EN
17
ZN: Zone temperature
The ZN analog input functions as the local (hard-wired) zone temperature
a 10 kΩ thermistor in a standard Trane zone sensor wired to analog input
ZN. A communicated zone temperature value via the LonTalk communications link can also be used for controllers operating on a BAS. When
both a hard-wired and communicated zone temperature value is present,
the controller uses the communicated value. If neither a hard-wired nor a
communicated zone temperature value is present, the controller generates a Space Temperature Failure diagnostic.
The ZN analog input is also used to communicate timed override requests
and cancel requests to the controller for applications utilizing a Trane
zone sensor with the ON and CANCEL button option.
SET: Temperature setpoint
The SET analog input functions as the local (hard-wired) temperature
setpoint input for applications utilizing a Trane zone sensor with a temperature setpoint thumbwheel. Use the Rover service tool or a BAS to
enable or disable the local setpoint input. A communicated setpoint value
via the LonTalk communications link can also be used for controllers
operating on a BAS. If both a hard-wired and a communicated setpoint
value are present, the controller uses the communicated value. If neither
a hard-wired nor a communicated setpoint value is present, the controller
uses the stored default setpoints (configurable using the Rover service
tool or a BAS). If a valid hard-wired or communicated setpoint value is
established and then is no longer present, the controller generates a Local
Space Setpoint Failure diagnostic.
18
CNT-SVX12C-EN
Chapter 4
Sequence of operations for the
A Tracer ZN517 unitary controller configured to control a 2-heat/2-cool
unit will operate to maintain the zone temperature setpoint. This chapter
discusses many of the operational sequences the controller uses to accomplish this goal.
Power-up sequence
When 24 Vac power is initially applied to the Tracer ZN517 unitary controller, the following sequence occurs:
1. The Status (green) LED goes on.
2. All outputs are controlled off.
3. The controller reads all input local values to determine initial values.
4. The power-up control wait function begins automatically if the configured power-up control wait time is greater than zero. When this function is enabled, the controller waits for the configured amount of time
(from 10 to 120 seconds) to allow a communicated occupancy request
to arrive. If a communicated occupancy request arrives, normal operation can begin. If a communicated occupancy request does not arrive,
the controller assumes stand-alone operation.
5. The Status LED goes off.
6. The wait timer expires.
7. The Status LED goes on.
8. If a hard-wired zone-temperature value is not detected, the controller
begins to wait for a communicated value. (This can take several minutes [15-minute default] and occurs concurrently with the remainder
of the power-up sequence.) If a communicated zone-temperature
value arrives, normal operation can begin when the power-up
sequence has concluded. If a communicated zone-temperature value
does not arrive, the binary outputs remain off and a Space Temperature Failure diagnostic is generated (normal operation cannot begin
without a valid zone temperature value).
9. Normal operation begins assuming no diagnostics have been generated.
CNT-SVX12C-EN
19
Chapter 4 Sequence of operations for the 2-heat/2-cool configuration
Cascade zone control
Cascade zone control maintains zone temperature by controlling the discharge air temperature to control the zone temperature. The controller
uses the difference between the measured zone temperature and the
active zone temperature setpoint to produce a discharge air temperature
setpoint. The controller compares the discharge air temperature setpoint
with the discharge air temperature and calculates a unit heating/cooling
capacity accordingly (see Figure 8). The end devices (outdoor air damper,
valves, etc.) operate in sequence based on the unit heating/cooling capacity (0–100%).
Figure 8. Cascade zone control
Active zone
temperature
setpoint
Difference
Calculated
discharge air
temperature
setpoint
Measured
zone
temperature
Difference
Calculated unit
heating/cooling
capacity
Measured
discharge air
temperature
If the discharge air temperature falls below the Discharge Air Control
Point Low Limit (configurable using the Rover service tool) and cooling
capacity is at a minimum, available heating capacity will be used to raise
the discharge air temperature to the low limit (see “Discharge air tempering” on page 24).
Simplified zone control
In the absence of a discharge air temperature sensor, the controller uses
simplified zone control to maintain the zone temperature. In the unoccupied mode, the controller maintains the zone temperature by calculating
the required heating or cooling capacity (0–100%) according to the measured zone temperature and the active zone temperature setpoint. The
active zone temperature setpoint is determined by the current operating
modes, which include occupancy and heat/cool modes.
Occupancy modes
Occupancy modes can be controlled by any of the following:
•
•
20
The state of the local (hard-wired) occupancy binary input BI1 (see
“BI1: Occupancy or generic” on page 50)
A timed override request from a Trane zone sensor (see “Timed override control” on page 22)
CNT-SVX12C-EN
Occupancy modes
•
•
A communicated signal from a peer device (see “Peer-to-peer communication” on page 23)
A communicated signal from a BAS
A communicated request, either from a BAS or a peer controller, takes
precedence over local requests. If a communicated occupancy request has
been established and is no longer present, the controller reverts to the
default (occupied) occupancy mode after 15 minutes (if no hard-wired
occupancy request exists). The Tracer ZN517 has the following occupancy
mode options:
•
•
•
•
Occupied
Unoccupied
Occupied standby
Occupied bypass
Occupied mode
In occupied mode, the controller maintains the zone temperature based
on the occupied heating or cooling setpoints. The controller uses the occupied mode as a default when other modes of occupancy request are not
present. The fan runs as configured (continuous or cycling). The outdoor
air damper closes when the fan is off. The temperature setpoints can be
local (hard-wired), communicated, or stored default values (configurable
using the Rover service tool or a BAS).
Unoccupied mode
In unoccupied mode, the controller attempts to maintain the zone temperature based on the unoccupied heating or cooling setpoint. The fan cycles
between high speed and off. The outdoor air damper remains closed. The
controller always uses the stored default setpoint values (configurable
using the Rover service tool or a BAS), regardless of the presence of a
hard-wired or communicated setpoint value.
Occupied standby mode
The controller is placed in occupied standby mode only when a communicated occupied request is combined with an unoccupied request from
occupancy binary input BI1. In occupied standby mode, the controller
maintains the zone temperature based on the occupied standby heating
or cooling setpoints. Because the occupied standby setpoints are typically
spread 2°F (1.1°C) in either direction and the outdoor air damper is
closed, this mode reduces the demand for heating and cooling the space.
The fan runs as configured (continuous or cycling) for occupied mode. The
using the Rover service tool or a BAS), regardless of hard-wired or communicated setpoint values.
CNT-SVX12C-EN
21
Occupied bypass mode
The controller is placed in occupied bypass mode when the controller is
operating in the unoccupied mode and either the timed override ON button on the Trane zone sensor is pressed or the controller receives a communicated occupied bypass signal from a BAS. In occupied bypass mode,
the controller maintains the zone temperature based on the occupied
heating or cooling setpoints. The fan runs as configured (continuous or
cycling). The outdoor air damper closes when the fan is off. The controller
will remain in occupied bypass mode until either the CANCEL button is
pressed on the Trane zone sensor or the occupied bypass time (configurable using the Rover service tool or a BAS) expires. The temperature
setpoints can be local (hard-wired), communicated, or stored default values (configurable using the Rover service tool or a BAS).
Timed override control
If the zone sensor has a timed override option (ON/CANCEL buttons),
pushing the ON button momentarily shorts the zone temperature signal
to the controller. This short is interpreted as a timed override on request.
A timed override on request changes the occupancy mode from unoccupied mode to occupied bypass mode. In occupied bypass mode, the controller controls the zone temperature based on the occupied heating or
cooling setpoints. The occupied bypass time, which resides in the Tracer
ZN517 and defines the duration of the override, is configurable (using the
Rover service tool or a BAS) from 0 to 240 minutes (default value is
120 minutes). When the occupied bypass time expires, the unit changes
from occupied bypass mode to unoccupied mode. Pushing the CANCEL
button momentarily sends a fixed resistance of 1.5 kΩ to the ZN analog
input of the controller, which is interpreted as a timed override cancel
request. A timed override cancel request will end the timed override
before the occupied bypass time has expired and will transition the unit
from occupied bypass mode to unoccupied mode.
If the controller is in any mode other than unoccupied when the ON button is pressed, the controller still starts the occupied bypass timer without changing the mode to occupied bypass. If the controller is placed in
unoccupied mode before the occupied bypass timer expires, the controller
will be placed in occupied bypass mode and remain in that mode until
either the CANCEL button is pressed on the Trane zone sensor or the
occupied bypass time expires.
Outdoor air damper operation
The Tracer ZN517 does not support a two-position outdoor air damper
actuator. However, a modulating, triac, 3-wire floating point actuator
with spring return can be used for two-position control. Two-position control can function only when an outdoor air temperature (either hardwired or communicated) does not exist, and by setting the damper minimum position (using the Rover service tool) to the desired value. To con-
22
CNT-SVX12C-EN
Fan operation
trol an air damper actuator for two-position control, configure the Tracer
ZN517 for economizing (economizing will not function).
Fan operation
The Tracer ZN517 can be configured to run continuously at a single speed
or to cycle on and off automatically. If configured for continuous operation, the fan runs continuously during the occupied, occupied standby,
and occupied bypass modes. If configured for cycling operation, the fan
will cycle if the temperature is away from setpoint during the occupied,
occupied standby, and occupied bypass modes. During the unoccupied
mode, the fan cycles regardless of the fan configuration.
Peer-to-peer communication
Tracer ZN517 unitary controllers have the ability to share data with
other LonTalk-based controllers. Multiple controllers can be bound as
peers, using the Rover service tool, to share:
•
•
•
•
•
Setpoint
Zone temperature
Heating/cooling mode
Fan status
Unit capacity control
Shared data is communicated from one controller to any other controller
that is bound to it as a peer. Applications having more than one unit serving a single zone can benefit by using this feature; it allows multiple units
to share a single zone temperature sensor and prevents multiple units
from simultaneously heating and cooling.
Economizing
Economizing (also referred to as “free cooling”) uses outside air for cooling. The Tracer ZN517 provides two triac (3-wire floating point) outputs
to control the damper actuator. One output opens the actuator; the other
closes it. The controller also provides analog inputs for both a discharge
air temperature sensor and an outside air temperature sensor. While
economizing is enabled, the controller uses a discharge air temperature
(DAT) control loop to maintain proper temperature control. The controller
opens the outside air damper, turns on the fan, and attempts to maintain
a user-defined discharge air temperature. If the outside air is unsuitable
for economizer operation, the outside air damper will close and normal
operation (DX cooling) will be activated. Economizing plus DX cooling is
initiated only when economizing alone cannot meet the zone’s cooling
requirements.
To enable this function, set DIP switch 3 to ON (see “DIP switch settings”
on page 12).
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23
Discharge air tempering
Discharge air tempering (also called supply air tempering) prevents occupant discomfort caused by cold outside air being brought into a space
through the outside air damper. This is an important feature in cold climates because the outside air damper is never fully closed for ventilation
purposes. Discharge air tempering starts when:
•
•
•
•
The controller is in heating mode.
The space is otherwise satisfied (no heating or cooling required).
Ventilation air is passing through the unit
The discharge air temperature falls 10°F (5.6°C) below the occupied
heating setpoint.
Tempering stops when the occupied heating setpoint is exceeded. To
enable this function, use the Rover service tool to select Supply Air Tempering Enabled.
Demand control ventilation
The Tracer ZN517 unitary controller modulates the outside air damper
position in direct response to the CO2 level, regulating the amount of outdoor air allowed to enter. This function is referred to as demand control
ventilation. Demand control ventilation requires that the two triac (3wire floating point) outputs be used to control the damper actuator. The
minimum damper position will increase as CO2 levels rise above
500 ppm. The function executes with a 3-minute loop frequency to allow
time for the sensor to respond.
To enable this function, use the Rover service tool to configure the Tracer
ZN517 as follows:
•
•
•
Configure AI1 as a carbon dioxide sensor
Enter a minimum CO2 level (Control Point)
(factory default: 500 ppm).
Enter a maximum CO2 threshold (Threshold)
When the CO2 level reaches the threshold, the minimum position is
100% open.
Unit protection strategies
The following strategies are initiated when specific conditions exist in
order to protect the unit or building from damage:
•
•
•
24
Filter maintenance timer
Fan off delay
Fan status
CNT-SVX12C-EN
Filter-maintenance timer
The filter-maintenance timer tracks the amount of time (in hours) that
the fan is enabled. The Maintenance Required Timer Setpoint (Maint Req
Time Setpoint), configured with the Rover service tool, is used to set the
amount of time until maintenance (typically, a filter change) is needed. If
the setpoint is configured to zero, the filter-maintenance timer is disabled.
The controller compares the fan-run time to Maintenance Required Timer
Setpoint. Once the setpoint is reached, the controller generates a Maintenance Required diagnostic. When the diagnostic is cleared, the controller
resets the filter-maintenance timer to zero, and the timer begins accumulating fan-run time again.
Fan off delay
The fan stays on for an additional 30 seconds (adjustable with the Rover
service tool) to allow the residual cooling or heating energy to be circulated through the system.
Fan status
The controller monitors fan status to protect equipment from overheating. If fan or airflow is not detected for 30 seconds when needed, the
equipment shuts down.
CNT-SVX12C-EN
25
26
CNT-SVX12C-EN
Chapter 5
Applications for the 4-cool
configuration
and setting DIP switches for typical 4-cool applications. The function of
inputs and outputs is also defined for these applications.
The types of 4-cool applications supported by the Tracer ZN517 unitary
controller are rooftop units with or without economizers.
CNT-SVX12C-EN
27
Chapter 5 Applications for the 4-cool configuration
all 4-cool applications.
Table 9. Required controller inputs for all 4-cool applications
Function
Input source
see:
24 Vac power
page 85
Zone temperature
Terminals: ZN, GND
or communicated
applications.
Table 10. Optional controller inputs and outputs for specific
applications
Application
Economizing
Input/Output
Input:
see:
page 23
Input:
Outputs:
OPN (binary output)
CLS (binary output)
Discharge air
tempering*
Input: DAT
Demand control
ventilation*
Input:
AI1 (CO2 sensor)
“Demand control
ventilation” on
page 24
Cascade control
Input: DAT
Figure 9 on page 29 show typical applications that include all required
and all optional components for 4-cool applications.
28
CNT-SVX12C-EN
Figure 9. Wiring diagram for 4-cool applications
Power*
Fan
Tri-state
modulating
economizer
(optional)
Common
24 Vac H
N
R
AC POWER AC OUT
SERVICE
LED
PIN
B
A
Rh
-BI1-
1
2
3
-BI2-
GND +20 AI1
-AI2-
LED
BINARY OUTPUT
ZONE SENSOR
ANALOG INPUTS
BINARY INPUTS
B
G
HVAC UNIT
ECONOMIZER
COMM5
A
Rc
Y1 Y2 Y3 Y4
G
-DAT-
ZN GND SET
COMM5
LED
LonTalk
In
GND
+
1
_
2
3
Out
inputs for 24 Vac power from the controlled device. If the device has a separate heating and cooling units, use Rh
CNT-SVX12C-EN
Occupancy
or generic
(optional)
Typical 3-wire
sensor
(optional)
Discharge air
temperature
Fan status or
generic
(optional)
Outdoor air
temperature
(optional)
LonTalk
4
5
On
Cancel
Dry contacts
only
29
DIP switch settings
Set the DIP switches on the circuit board for the 4-cool configuration. The
correct settings are shown in Figure 10.
Figure 10. DIP switch settings for the 4-cool configuration
ON DIP
4-cool without
economizer
1 2 3 4
ON DIP
1 2 3 4
ON DIP
4-cool with
economizer
1 2 3 4
30
CNT-SVX12C-EN
Binary outputs for 4-cool applications
Binary outputs for 4-cool applications
This configuration supports rooftop unit applications that have the following components:
•
•
•
•
•
•
•
Economizer
Supply fan
Cool 1
Cool 2
Cool 3
Cool 4
Exhaust fan
The Tracer ZN517 controller has seven binary outputs. Each binary output is a relay with a rating of 12 VA. Table 11 describes the function of
each output for 4-cool applications.
Table 11. Binary outputs for 4-cool applications
Function
OPN
CLS
G
Supply fan
1 (Y1)
Cool stage 1
2 (Y2)
Cool stage 2
3 (Y3)
Cool stage 3
4 (Y4)
Cool stage 4
Exhaust fan/generic/occupancy
Binary output 5
•
•
•
•
Not used.
mode.
CNT-SVX12C-EN
31
Binary inputs for 4-cool applications
4-cool applications. Each function is explained in the succeeding paragraphs. For an explanation of the diagnostics generated by each binary
input, see “Table of diagnostics” on page 79. For more information about
how the controller operates, see Chapter 6, “Sequence of operations for
the 4-cool configuration”.”
Table 12. Binary inputs for 4-cool applications
Binary input
terminal label
Function
BI1
BI2
Fan status
page 38.)
BI2: Fan status
32
CNT-SVX12C-EN
Analog inputs for 4-cool applications
The Tracer ZN517 controller has five analog inputs. Table 13 describes
the function of each input for 4-cool applications. Each function is
Chapter 6, “Sequence of operations for the 4-cool configuration”.
Table 13. Analog inputs for 4-cool applications
Analog input
terminal label
Function
AI1
AI2
DAT
ZN
SET
Note:
Table 14.
Table 14. AI1 configuration options and associated measurement
ranges
Configuration
Measurement range
0–100%
(4 mA=0%; 20 mA=100%)
CO2 measurement
0–2000 ppm
(4 mA=0 ppm; 20 mA=2000 ppm)
0–100%
(4 mA=0% RH; 20 mA=100% RH)
Note:
For the generic input configuration, a 4–20 mA sensor must be hardwired to the AI1 terminal. (Wiring is dependent on the specific application.) The sensor communicates a value of 0–100% to the BAS. This configuration has no direct effect on Tracer ZN517 operation.
CNT-SVX12C-EN
33
For the CO2 measurement configuration, a 4–20 mA sensor must be hardwired to the AI1 terminal as shown in Figure 11 on page 34. The sensor
will transmit a 0–2000 ppm value to the BAS. This configuration has no
direct effect on Tracer ZN517 operation. If a valid value is established
and then is no longer present, the controller generates a CO2 Sensor Failure diagnostic.
GND +20 AI1
Tracer ZN517
{
24 Vac
CO2 sensor
(Trane part number:
4190 4100 or 4190 4101)
24 Vac GND
Out
humidity sensor (see Figure 12) must provide a value to the controller. If
a valid hard-wired or communicated relative humidity value is established and then is no longer present, the controller generates an RH Sensor Failure diagnostic and disables the dehumidification function. The
RH sensor is used only to provide a valid humidity reading to a BAS; it
does not affect the operation of the Tracer ZN517.
GND +20 AI1
Tracer ZN517
RH sensor
+ –
Figure Note:
numbers 4190 1109, 4190 7011, 4190 7012, 4190 7014).
34
CNT-SVX12C-EN
The AI2 analog input can function as either:
•
•
on page 41.)
Note:
either sensor lead.
Note:
CNT-SVX12C-EN
35
36
CNT-SVX12C-EN
Chapter 6
Sequence of operations for
the 4-cool configuration
A Tracer ZN517 unitary controller configured to control a 4-cool unit will
operate to maintain the zone temperature setpoint. This chapter discusses many of the operational sequences the controller uses to accomplish this goal.
Power-up sequence
CNT-SVX12C-EN
37
Chapter 6 Sequence of operations for the 4-cool configuration
Active zone
temperature
setpoint
Difference
Calculated
discharge air
temperature
setpoint
Measured
zone
temperature
Difference
Calculated unit
heating/cooling
capacity
Measured
discharge air
temperature
Occupancy modes
•
•
38
CNT-SVX12C-EN
Occupancy modes
•
•
mode options:
•
•
•
•
Occupied
Unoccupied
Occupied standby
Occupied bypass
Occupied mode
present. The fan runs as configured (continuous or cycling). The outdoor
air damper closes when the fan is off. The temperature setpoints can be
local (hard-wired), communicated, or stored default values (configurable
using the Rover service tool or a BAS).
Unoccupied mode
In unoccupied mode, the controller attempts to maintain the zone temperature based on the unoccupied heating or cooling setpoint. The fan cycles
between high speed and off. The outdoor air damper remains closed. The
The fan runs as configured (continuous or cycling) for occupied mode.
CNT-SVX12C-EN
39
cycling). The outdoor air damper closes when the fan is off. The controller
will remain in occupied bypass mode until either the CANCEL button is
pressed on the Trane zone sensor or the occupied bypass time (configurable using the Rover service tool or a BAS) expires. The temperature
setpoints can be local (hard-wired), communicated, or stored default values (configurable using the Rover service tool or a BAS).
Rover service tool or a BAS) from 0 to 240 minutes (default value is 120
minutes). When the occupied bypass time expires, the unit changes from
occupied bypass mode to unoccupied mode. Pushing the CANCEL button
momentarily sends a fixed resistance of 1.5 kΩ to the ZN analog input of
the controller, which is interpreted as a timed override cancel request. A
timed override cancel request will end the timed override before the occupied bypass time has expired and will transition the unit from occupied
bypass mode to unoccupied mode.
40
CNT-SVX12C-EN
Fan operation
Fan operation
•
•
•
•
•
Setpoint
Zone temperature
Fan status
Economizing
requirements.
on page 30).
CNT-SVX12C-EN
41
•
•
•
•
heating setpoint.
ventilation. Demand control ventilation requires that the two triac (3wire floating point) outputs be used to control the damper actuator. The
500 ppm. The function executes with a 3-minute loop time to allow time
for the sensor to respond.
ZN517 as follows:
•
•
•
100% open.
•
•
•
42
Filter maintenance timer
Fan off delay
Fan status
CNT-SVX12C-EN
Fan off delay
service tool) to allow the residual cooling energy to be circulated through
the system.
Fan status
CNT-SVX12C-EN
43
44
CNT-SVX12C-EN
Chapter 7
Applications for the heat
pump configuration
and setting DIP switches for typical heat pump applications. The function
of inputs and outputs is also defined for these applications.
The types of heat pump applications supported by the Tracer ZN517 unitary controller are heat pumps with:
•
•
•
CNT-SVX12C-EN
One or two compressors with reversing valves
Optional auxiliary heat control
Optional economizer control
45
Chapter 7 Applications for the heat pump configuration
all heat pump applications.
Table 15. Required controller inputs for proper operation
Function
Input source
see:
24 Vac power
page 85
Zone temperature
Terminals: ZN, GND
or communicated
applications.
Table 16. Optional controller inputs and outputs for specific
applications
Application
Economizing
Input/Output
Input:
see:
page 23
Input:
Outputs:
OPN (binary output)
CLS (binary output)
Discharge air
tempering*
Input: DAT
Demand control
ventilation*
Input:
AI1 (CO2 sensor)
“Demand control
ventilation” on
page 24
Cascade control
Input: DAT
Figure 14 on page 47 shows all required and optional components connected for heat pump applications.
46
CNT-SVX12C-EN
Figure 14. Wiring diagram for heat pump applications
Power*
Fan
Tri-state
modulating
economizer
(optional)
Reversing valve
Common
Auxiliary heat
24 Vac H
N
R
AC POWER AC OUT
SERVICE
LED
PIN
B
A
Rh
-BI1-
1
2
3
-BI2-
W1
GND +20 AI1
-AI2-
LED
BINARY OUTPUT
ZONE SENSOR
ANALOG INPUTS
BINARY INPUTS
B
G
HVAC UNIT
ECONOMIZER
COMM5
A
Rc
Y1 Y2 O
G
-DAT-
ZN GND SET
COMM5
LED
LonTalk
In
GND
+
1
_
2
3
Out
Typical 3-wire
sensor
(optional)
inputs for 24 Vac power from the conFan status or
trolled device. If the device has a sepa- Occupancy
generic
or generic
rate heating and cooling units, use Rh (optional)
(optional)
Dry contacts
only
CNT-SVX12C-EN
Discharge air
temperature
LonTalk
4
5
On
Cancel
Outdoor air
temperature
(optional)
47
DIP switch settings
Set the DIP switches on the circuit board for the heat pump configuration. The correct settings are shown in Figure 15.
Figure 15. DIP switch settings for heat pump configuration
ON DIP
Heat pump
without economizer
1 2 3 4
ON DIP
1 2 3 4
ON DIP
Heat pump with
economizer
1 2 3 4
48
CNT-SVX12C-EN
Binary outputs for heat pump applications
Binary outputs for heat pump
applications
This configuration supports heat pump applications that have the following components:
•
•
•
•
•
•
Economizer
Supply fan
One or two compressors
Reversing valve
Auxiliary heat
Exhaust fan
The Tracer ZN517 controller has eight binary outputs. Each binary output is a relay with a rating of 12 VA. Table 17 describes the function of
each output for heat pump applications.
Table 17. Binary outputs for 2-heat/2-cool applications
Function
OPN
CLS
G
Supply fan
1 (Y1)
Compressor 1
2 (Y2)
Compressor 2
3 (O)
Reversing valve
4 (W1)
Auxiliary heat
Exhaust fan/generic/occupancy
Binary output 5
•
•
•
•
Not used.
mode.
CNT-SVX12C-EN
49
Binary inputs for heat pump
applications
4-cool applications. Each function is explained in the succeeding paragraphs. For an explanation of the diagnostics generated by each binary
input, see “Table of diagnostics” on page 79. For more information about
how the controller operates, see Chapter 8, “Sequence of operations for
the heat pump configuration”.”
Table 18. Binary inputs for heat pump applications
Binary input
terminal label
Function
BI1
BI2
Fan status
page 56.)
BI2: Fan status
50
CNT-SVX12C-EN
Analog inputs for heat pump applications
Analog inputs for heat pump
applications
The Tracer ZN517 controller has five analog inputs. Table 19 describes
the function of each input for heat pump applications. Each function is
Chapter 8, “Sequence of operations for the heat pump configuration”.
Table 19. Analog inputs for heat pump applications
Analog input
terminal label
Function
AI1
AI2
DAT
ZN
SET
Note:
Table 20.
Table 20. AI1 configuration options and associated measurement
ranges
Configuration
Measurement range
0–100%
(4 mA=0%; 20 mA=100%)
CO2 measurement
0–2000 ppm
(4 mA=0 ppm; 20 mA=2000 ppm)
0–100%
(4 mA=0% RH; 20 mA=100% RH)
Note:
For the generic input configuration, a 4–20 mA sensor must be hardwired to the AI1 terminal. (Wiring is dependent on the specific applica-
CNT-SVX12C-EN
51
tion.) The sensor communicates a value of 0–100% to the BAS. This configuration has no direct effect on Tracer ZN517 operation.
For the CO2 measurement configuration, a 4–20 mA sensor must be hardwired to the AI1 terminal as shown in Figure 16. The sensor will transmit
a 0–2000 ppm value to the BAS. This configuration has no direct effect on
Tracer ZN517 operation. If a valid value is established and then is no
longer present, the controller generates a CO2 Sensor Failure diagnostic.
GND +20 AI1
Tracer ZN517
{
24 Vac
CO2 sensor
(Trane part number:
4190 4100 or 4190 4101)
24 Vac GND
Out
humidity sensor (see Figure 17) must provide a value to the controller. If
a valid hard-wired or communicated relative humidity value is established and then is no longer present, the controller generates a RH Sensor
Failure diagnostic and disables the dehumidification function. The RH
sensor is used only to provide a valid humidity reading to a BAS; it does
not affect the operation of the Tracer ZN517.
GND +20 AI1
Tracer ZN517
RH sensor
+ –
Figure Note:
numbers 4190 1109, 4190 7011, 4190 7012, 4190 7014).
52
CNT-SVX12C-EN
Analog inputs for heat pump applications
The AI2 analog input can function as either:
•
•
on page 60.)
Note:
either sensor lead.
Note:
CNT-SVX12C-EN
53
54
CNT-SVX12C-EN
Chapter 8
Sequence of operations for
the heat pump configuration
A Tracer ZN517 unitary controller configured to control a heat pump will
operate to maintain the zone temperature setpoint. This chapter discusses many of the operational sequences used to accomplish this goal.
Power-up sequence
CNT-SVX12C-EN
55
Chapter 8 Sequence of operations for the heat pump configuration
Active zone
temperature
setpoint
Difference
Calculated
discharge air
temperature
setpoint
Measured
zone
temperature
Difference
Calculated unit
heating/cooling
capacity
Measured
discharge air
temperature
Occupancy modes
•
•
56
CNT-SVX12C-EN
Occupancy modes
•
•
mode options:
•
•
•
•
Occupied
Unoccupied
Occupied standby
Occupied bypass
Occupied mode
present. The fan runs as configured (continuous or cycling with compressor operation). The outdoor air damper closes when the fan is off. The
temperature setpoints can be local (hard-wired), communicated, or stored
default values (configurable using the Rover service tool or a BAS).
Unoccupied mode
In unoccupied mode, the controller operates to maintain the zone temperature based on the unoccupied heating or cooling setpoint. The fan cycles
with compressor operation. The outdoor air damper remains closed. The
The fan runs as configured (continuous or cycling with the compressor).
CNT-SVX12C-EN
57
cycling with the compressor). The outdoor air damper closes when the fan
is off. The controller will remain in occupied bypass mode until either the
CANCEL button is pressed on the Trane zone sensor or the occupied
bypass time (configurable using the Rover service tool or a BAS) expires.
The temperature setpoints can be local (hard-wired), communicated, or
stored default values (configurable using the Rover service tool or a BAS).
Rover service tool or a BAS) from 0 to 240 minutes (default value is 120
minutes). When the occupied bypass time expires, the unit changes from
occupied bypass mode to unoccupied mode. Pushing the CANCEL button
momentarily sends a fixed resistance of 1.5 kΩ to the ZN analog input of
the controller, which is interpreted as a timed override cancel request. A
timed override cancel request will end the timed override before the occupied bypass time has expired and will transition the unit from occupied
bypass mode to unoccupied mode.
58
CNT-SVX12C-EN
Heating or cooling mode
The heating or cooling mode can be determined in one of two ways:
•
•
By a communicated signal from a BAS or a peer controller
Automatically, as determined by the controller
A communicated heating signal permits the controller to heat only. A
communicated cooling signal permits the controller to cool only. A communicated auto signal allows the controller to automatically change from
heating to cooling and vice versa.
In heating and cooling mode, the controller maintains the zone temperature based on the active heating setpoint and the active cooling setpoint,
respectively. The active heating and cooling setpoints are determined by
the occupancy mode of the controller.
When no communicated signal is present (stand-alone operation) or the
communicated signal is auto, the controller automatically determines the
heating or cooling mode.
Fan operation
Compressor operation
The Tracer ZN517 supports heat pump applications with one or two compressors. The compressor(s) will cycle to meet zone temperature requirements. Compressor operation will be overridden by a preset 3-minute
minimum on/off time delay in order to maintain oil return when the unit
is either initially energized, manually reset, switched between modes, or
cycled within a single mode.
Reversing valve operation
The reversing valve is configurable to energize in either the cooling mode
(typical of Trane units) or the heating mode. Be sure to configure the
reversing valve operation based on the heat pump manufacturer’s design.
An energized valve will remain energized until a mode change (either
CNT-SVX12C-EN
59
from cooling to heating or vice versa) is initiated. The reversing-valve
operation is delayed after compressor shutdown to reduce noise due to
refrigerant migration. The reversing valve will de-energize when a power
failure occurs, or when the controller is set to off either through a communicated off signal or when the fan switch is set to OFF.
Economizing
requirements.
on page 48).
•
•
•
•
heating setpoint.
ventilation. Demand control ventilation requires that the two triac (3-
60
CNT-SVX12C-EN
wire floating point) outputs be used to control the damper actuator. The
500 ppm. The function executes with a 3-minute loop frequency to allow
time for the sensor to respond.
ZN517 as follows:
•
•
•
100% open.
•
•
•
•
•
Setpoint
Zone temperature
Fan status
•
•
•
Fan off delay
Fan status
CNT-SVX12C-EN
61
Fan off delay
service tool) to allow the residual cooling or heating energy to be circulated through the system.
Fan status
62
CNT-SVX12C-EN
Chapter 9
PID control
This chapter will help you set up, tune, and troubleshoot proportional,
integral, derivative (PID) control loops used in the Tracer ZN517 unitary
controller. For more information about PID loops, see BAS-APG002, PID
Control in Tracer Multi-Purpose Controllers.
PID control requires the use of a Rover service tool. All PID factory
defaults can be restored by clicking the Use Defaults button.
What PID loops do
A PID loop automatically controls an output to maintain a measured
value at its setpoint by monitoring the error (the difference between the
measured value and the setpoint). The loop performs proportional, integral, and derivative calculations to determine how aggressively to change
the output.
The goal of PID control is to reach the setpoint as quickly as possible
without overshooting the setpoint or destabilizing the system and to
maintain the setpoint consistently over time. If the system is too aggressive, it will overshoot the setpoint as shown in Figure 19. If it is not
aggressive enough, the time to reach the setpoint will be unacceptably
slow.
Figure 19. The effects of PID aggressiveness
Too aggressive (overshoot)
Measured value
Setpoint
Ideal response
Too slow
Initial point
Time
CNT-SVX12C-EN
63
Chapter 9 PID control
PID calculations
PID algorithms perform three calculations: the proportional calculation,
the integral calculation, and the derivative calculation. These calculations are independent of each other but are combined to determine the
response of the controller to the error.
Proportional calculation
The proportional calculation responds to how far the measured value is
from the setpoint. The larger the error, the larger the output of the calculation. The proportional calculation has a much stronger effect on the
result of the PID algorithm than either the integral or derivative calculations. It determines the responsiveness (or aggressiveness) of a control
system. Though some systems use only proportional control, most Trane
controllers use a combination of proportional and integral control.
Proportional-only control loops require an error to produce an output. If
the setpoint and the process variable are the same, the error is zero, so
the system does not have an output. In an HVAC system, this can cause
an actuator to open or close. The integral calculation solves this problem.
The recommended range for the proportional calculation in the Tracer
ZN517 is 4–16. Restore PID factory defaults by clicking the Use Defaults
button.
Integral calculation
The integral calculation responds to the length of time the measured
value is not at setpoint. The longer the measured value is not at setpoint,
the larger the output of the calculation.
The integral calculation uses the sum of past errors to maintain an output when the error is zero. Line 1 in Figure 20 on page 65 shows that with
proportional-only control, when the error becomes zero, the PID output
also goes to zero. Line 2 in Figure 20 shows the integral output added to
the proportional output. Because the integral calculation is the sum of
past errors, the output remains steady rather than dropping to zero when
the error is zero. The benefit of this is that the integral calculation keeps
the output at the appropriate level to maintain an error of zero.
The value of the integral calculation can build up over time (because it is
the sum of all past errors), and this built-up value must be overcome
before the system can change direction. This prevents the system from
over-reacting to minor changes, but can potentially slow the system down.
The recommended range for the integral calculation in the Tracer ZN517
is 1–10. Restore PID factory defaults by clicking the Use Defaults button.
64
CNT-SVX12C-EN
Sampling frequency
Figure 20. Integral output added to proportional output
Output
Error ≠ 0
Error = 0
Proportional + integral
output if proportional
output has gone to zero
Proportional + integral
output
2
1
Proportional-only
output
Time
Derivative calculation
The derivative calculation responds to the change in error. In other
words, it responds to how quickly the measured value is approaching setpoint. The derivative calculation can be used to smooth an actuator
motion or cause an actuator to react faster.
However, derivative control has several disadvantages:
•
•
•
•
It can react to noise in the input signal.
Setting derivative control requires balancing between two extremes;
too much derivative gain and the system becomes unstable, too little
and the derivative gain has almost no effect.
The lag in derivative control makes tuning difficult.
Large error deadbands, common in HVAC applications, render derivative control ineffective.
Because of these disadvantages, derivative control is rarely used in HVAC
applications (with the exception of steam valve controllers, which use
derivative control to force the steam valve to react faster to changes).
Sampling frequency
The sampling frequency is the rate at which the input signal is sampled
and PID calculations are performed. Using the right sampling frequency
is vital to achieving a responsive and stable system. Problems can arise if
the sampling frequency is too slow or too fast in comparison to time lags
in the system.
Sampling too slowly can cause an effect called aliasing in which not
enough data is sampled to form an accurate picture of changes in the
CNT-SVX12C-EN
65
measured value. The system may miss important information and reach
setpoint slowly or not at all.
Figure 21 and Figure 22 show how aliasing can affect system response. In
Figure 21 the sampling frequency is too slow. Because of this, many of the
actual changes in duct static pressure are missed. In Figure 22 the sampling frequency is fast enough that the changes in static pressure are
tracked accurately.
Figure 21. Sampling too slowly
Changes missed
by system
Duct static pressure
Sampling points
Time
Figure 22. Sampling at the correct rate
Duct static pressure
Sampling points
Time
Problems also arise from sampling too quickly. Some systems have naturally slow response times, such as when measuring room temperature.
Slow response times can also be caused by equipment lags. Since PID
loops respond to error and changes in error over time, if the process variable (measured value) changes slowly, then the error will remain constant
for an extended period of time. If the process variable is sampled repeatedly during this time, the proportional output remains about the same,
but the integral output becomes larger (because it is the sum of past
errors). When the control system does respond, the response is out of proportion to the reality of the situation, which can destabilize the system.
66
CNT-SVX12C-EN
Sampling frequency
The control system should always wait to process the result of a change
before making another change.
Figure 23 shows the process variable if sampling times are too fast,
acceptable, and barely acceptable. If the sampling frequency is too fast (2
seconds), the process variable begins to oscillate and finally destabilizes
because the PID loop output drives the actuator to extremes.
Figure 23. System stability with different sampling times
Process variable
Sampling freq. = 10 s
(system destabilizes if
sampling freq. is too fast)
Time
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67
PID loop action
The action of a PID loop determines how it reacts to a change in the process variable (such as a room temperature). A controller using direct
action increases the output when the process variable increases. A controller using reverse action decreases the output when the process variable increases.
Direct action
Figure 24 shows the temperature when a system is cooling a space. If the
error is large and the PID output is at 100%, the actuator and valve combination are fully open. As the process variable (room temperature)
decreases, the error becomes smaller, and the controller closes the valve
to reduce or stop cooling. Since the PID output and process variable move
in the same direction (both decreasing), the loop is direct acting.
Figure 24. Cooling a space
Temperature
Process variable
(temperature)
Error
Setpoint
Time
Reverse action
Figure 25 shows the temperature when a system is heating a space. If the
error is large and the PID output is at 100%, the actuator and valve combination are fully open. If the process variable (room temperature)
increases, reducing the error, the controller closes the valve to reduce
heating. Since the PID output and process variable move in opposite
directions, the loop is reverse acting.
Figure 25. Heating a space
Time
Setpoint
Temperature
Error
68
Process variable
(temperature)
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Error deadband
Error deadband
Error deadband is typically used to minimize actuator activity. It can also
be used to allow for some “slop” in the system sensors and actuator
mechanics. Error deadband prevents the PID output from changing if the
absolute value of the error is less than the error deadband. For example,
in Figure 26 the error deadband is set at 2.0°F (1.1°C). As long as the
absolute value of the error is less than the 2.0°F (1.1°C), the PID output
cannot change. If the absolute value of the error does exceed 2.0°F
(1.1°C), the PID output can change.
Error
Figure 26. Error deadband
Process
variable
Control
Error deadband
Setpoint
Control
As can be seen from Figure 26, error deadband is a means of limiting how
often an actuator is controlled. If a PID loop controls a chilled water
valve, this is not so important. But if a PID loop controls how many stages
of cooling are being used, it is important to limit equipment cycling.
Adjusting error deadband for modulating outputs
In most applications, start with an error deadband of five or ten times the
sensor resolution. For example, thermistors have a resolution of approximately 0.1°F (0.06°C), so a good error deadband is 0.5°F (0.3°C). This setting ensures that the sensor reading has changed an adequate amount
before the controller responds.
IMPORTANT
The error deadband should not be smaller than the sensor resolution or
the controller will react to noise.
Adjusting error deadband for staged outputs
This section shows how to adjust the error deadband for staging applications.
Finding the best error deadband for staged output applications is more
difficult than for modulating outputs. Instead of using a continuous actuator, such as a chilled water valve, staged systems use binary outputs to
start and stop pieces of equipment, such as fans in a cooling tower. Each
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69
piece of equipment contributes a set amount to the final output. When
setting the error deadband for staged outputs, the main goal is to reduce
equipment cycling.
Follow these guidelines when adjusting the error deadband:
•
Ask how tight control should be. A smaller error deadband results in
tighter control, but control should not be so tight that the stages cycle
on and off too frequently.
For example, for a VAV air-handler turning on cooling stages, control
can be somewhat loose. The individual VAV boxes control their valve
to the space depending on the supply air temperature. If the supply
air temperature is relatively warm, the VAV box allows more air flow.
If the supply air temperature is somewhat cool, the VAV box constricts the air flow.
•
The contribution of each stage can change depending on external circumstances, so make adjustments under worst case conditions.
Adjust the error deadband for cooling tower fan stages on very warm
days, and adjust the error deadband for boiler stages on very cold
days.
With the preceding guidelines in mind, use the following procedure to
determine error deadband.
To adjust the error deadband for staged outputs:
1. Run the system manually.
If possible, do so under worst-case conditions for the site. Although it
is not always possible for a technician to do this, it is possible for a
well-trained customer.
2. Find the smallest change in temperature, ∆T, that the first stage can
contribute (the quantity could also be building static pressure for fans
or flow for pumps).
Pay attention to possible changes in external circumstances, such as
the amount of water flow. If the system uses a lead-lag approach to
the equipment, it will be necessary to find the minimum ∆T for all
stages.
3. Multiply ∆T by 0.45 (the error deadband should be slightly less than
half of ∆T).
Keep in mind the resolution of the sensor. You may need to round the
error deadband to a more reasonable value.
4. Run the system with the new error deadband.
Cycling should be reduced as much as possible.
70
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Other PID settings
Other PID settings
You can also use these settings to manage PID loops:
•
•
•
•
Proportional bias, which takes the place of derivative gain in proportional-only control
Minimum and maximum output, which limit the range of output of
the PID algorithm
Enabled and disabled modes, which enable the PID output or disable
it to a default value
Fail-safe mode sets the PID output to a “safe” value if the hardware
input that provides the process variable fails.
For more information, see BAS-APG002, PID Control in Tracer MultiPurpose Controllers.
Troubleshooting procedure
IMPORTANT
Remember to change only one thing at a time.
Follow these steps to troubleshoot a PID loop:
1. Make sure that the system is not in override.
2. Graph the process variable, setpoint, and valve position over time to
determine how the system performs.
Look at the big picture. Can the system do what’s expected of it? What
is happening to the process variable? Is it oscillating or failing to
reach setpoint? Is the output oscillating?
3. Check for failure conditions that are always true.
4. Check PID settings for:
•
•
•
Output minimum incorrectly set to 100%
Output maximum incorrectly set to 0%
Sampling time that is too fast or too slow
5. Check the system for disturbances from:
•
•
Bad actuator linkages
Faulty sensors
6. Change PID gains.
•
•
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Reduce gains if experiencing system overshoot, output at minimum or maximum, or cycling of output around setpoint
Increase gains if experiencing system undershoot
71
Tips for specific problems
Table 21 provides tips for troubleshooting specific problems.
Table 21. Tips for specific problems
Problem
Measured value is cycling
around setpoint
Tips
• Slow the sampling frequency
• Decrease PID gains
Overshooting setpoint
Reduce gains
Undershooting setpoint
Increase gains
Output at maximum
Ensure that minimum output is not set to 100%
Output at minimum
Ensure that maximum output is not set to 0%
Changing the sampling frequency
The major cause of actuator cycling is time lags in the system. If a 10%
change in PID output requires two minutes to affect the process variable,
it does no good to have the sampling frequency set to two seconds. The
integral contribution will build up before any significant change in error
can be measured. A sampling frequency of 30 to 60 seconds would work
much better in this situation. In other words, to fix a cycling system, slow
down the loop! See “Sampling frequency” on page 65 for more information.
Changing the gains
Be careful when changing PID gains. Never change gains unless the
effects can be measured. Use a doubling/halving technique when increasing or decreasing gains. If the PID gains are set to 4, 1, and 0 respectively,
and you are going to reduce them, try 2, 0.5, and 0. If the system now
undershoots, try gains of 3, 0.75, and 0 respectively.
72
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Chapter 10
Status indicators for
operation and
communication
This chapter describes the operation and communication status indicators on the Tracer ZN517 unitary controller, including:
•
•
A description of the location and function of the Test button and Service Pin button and the light-emitting diodes (LEDs)
A complete list of the diagnostics that can occur, their effect on controller outputs, and an explanation of how to clear diagnostics and
restore the device to normal operation
Test button
Use the Test button to perform the manual output test (see “Manual output test” on page 74), which verifies that the controller is operating properly. Figure 27 shows its location.
Figure 27. Tracer ZN517 unitary controller circuit board
J1 (location of
jumper for Rc, Rh
terminals)
Status LED (green)
DIP switches
Test button
Service Pin button
Service LED (red)
LonTalk LED (yellow)
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73
Chapter 10 Status indicators for operation and communication
Manual output test
The manual output test sequentially turns off and on all binary outputs
to verify their operation. The test overrides normal operation of the controller, which is suspended while the test is being performed.
Use the manual output test to:
•
•
•
Verify output wiring and operation.
Force compressor operation so that a technician can use test equipment to verify unit operation.
Clear diagnostics and restore normal operation (although not a primary function of the manual output test).
Perform the manual output test either by repeatedly pressing the Test
button to proceed through the test sequence or by using the Rover service
tool. Table 22 on page 75, Table 23 on page 75, and Table 24 on page 76
list the outputs in the sequence in which they are verified for the 2-heat/
2-cool, 4-cool, and heat pump configurations, respectively.
To perform a manual output test:
1. Press and hold the Test button for 3 to 4 seconds, then release the
button to start the test mode. The green LED light goes off when the
Test button is pressed, and then it blinks (as described in Table 26 on
page 77) when the button is released to indicate the controller is in
manual test mode.
2. Press the Test button (no more than once per second) to advance
through the test sequence. Table 22 shows the resulting activities of
the binary outputs.
3. The controller exits the test mode after the final step or after 1 hour
passes, whichever comes first.
Note:
The outputs are not subject to minimum on or off times during
the test sequence. However, the test sequence permits only one
step per second, which enforces a minimum output time.
Service Pin button
Use the Service Pin button to verify that the controller is communicating
on the network communications link, and to add devices and identify
existing devices on the network communications link. See Figure 27 on
page 73 for the location of the Service Pin button.
For more information about the function of the Service Pin button, see the
Rover Operation and Programming guide (EMTX-SVX01B-EN) or the
Tracker Building Automation System Hardware Installation guide
(BMTK-SVN01A-EN).
74
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Service Pin button
1
2
Cool stage 2 (2)
Heat stage 1 (3)
Heat stage 2 (4)
Exhaust fan/generic/
occupancy
(5NO/5COM/5NC)
Cool stage 1 (1)
Fan
on1
Economizer (OPN)
2
Begins test mode
Fan (G)
1
Result
Step (number of times
Test button is pressed
in sequence)
Table 22. Manual output test sequence for 2-heat/2-cool configurations
Off
Off
Off
Off
Off
Off
Off
On
Off
Off
Off
Off
Off
Off
3
Compressor 1
On
Off
On
Off
Off
Off
Off
4
Compressor 2
On
Off
On
On
Off
Off
Off
5
Heat 1
On
Off
Off
Off
On
Off
Off
6
Heat 2
On
Off
Off
Off
On
On
Off
7
Outdoor air damper
On
On
Off
Off
Off
Off
Off
8
Generic/exhaust fan/occupancy
On
Off
Off
Off
Off
Off
On
9
Exit2
Off
Off
Off
Off
Off
Off
Off
At the beginning of Step 2, the controller attempts to clear all diagnostics.
This step exits the manual output test and initiate a reset to restore the controller to normal operation.
1
2
Cool stage 1 (1)
Cool stage 2 (2)
Heat stage 1 (3)
Heat stage 2 (4)
occupancy
(5NO/5COM/5NC)
Economizer (OPN)
1
Begins test mode
Off
Off
Off
Off
Off
Off
Off
2
Fan on1
On
Off
Off
Off
Off
Off
Off
3
Compressor 1
On
Off
On
Off
Off
Off
Off
Result
Fan (G)
in sequence)
Table 23. Manual output test sequence for 4-cool configurations
4
Compressor 2
On
Off
On
On
Off
Off
Off
5
Compressor 3
On
Off
On
On
On
Off
Off
6
Compressor 4
On
Off
On
On
On
On
Off
7
Outdoor air damper
On
On
Off
Off
Off
Off
Off
8
On
Off
Off
Off
Off
Off
On
9
Exit2
Off
Off
Off
Off
Off
Off
Off
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75
1
2
Cool stage 2 (2)
Heat stage 1 (3)
Heat stage 2 (4)
occupancy
(5NO/5COM/5NC)
Cool stage 1 (1)
Fan
on1
Economizer (OPN)
2
Begins test mode
Fan (G)
1
Result
in sequence)
Table 24. Manual output test sequence for heat pump configurations
Off
Off
Off
Off
Off
Off
Off
On
Off
Off
Off
Off
Off
Off
3
Reversing valve on
On
Off
Off
Off
On
Off
Off
4
Compressor 1
On
Off
On
Off
On
Off
Off
5
Compressor 2
On
Off
On
On
On
Off
Off
6
Compressors off
On
Off
Off
Off
Off
Off
Off
7
Auxiliary heat
On
Off
Off
Off
Off
On
Off
8
Outdoor air damper
On
On
Off
Off
Off
Off
Off
9
On
Off
Off
Off
Off
Off
On
10
Exit2
Off
Off
Off
Off
Off
Off
Off
Interpreting LEDs
The red LED on the Tracer ZN517 unitary controller (see Figure 27 on
page 73) indicates whether the controller is not working properly (see
Table 25).
Table 25. Red LED: Service indicator
LED activity
Explanation
LED is off continuously when power
is applied to the controller.
The controller is operating normally.
LED is on continuously when power
is applied to the controller.
The controller is not working properly, or someone is pressing the Service button.
LED flashes once every second.
The controller is not executing the
application software because the network connections and addressing
have been removed.1
1
76
Restore the controller to normal operation using the Rover service tool. Refer to
EMTX-SVX01B-EN for more information.
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Interpreting LEDs
The green LED on the Tracer ZN517 unitary controller (see Figure 27 on
page 73) indicates whether the controller has power applied to it and if
the controller is in manual test mode (see Table 26).
Table 26. Green LED: Status indicator
LED activity
Explanation
LED is on continuously.
Power is on (normal operation).
LED blinks (one recurring blink).
Manual output test mode is being
performed and no diagnostics are
present.
LED blinks (blinks twice as a recurring sequence).
Manual output test mode is being
performed and one or more diagnostics are present.
LED blinks (1/4 second on,
1/4 second off for 10 seconds).
The Auto-wink option is activated,
and the controller is communicating.1
LED is off continuously.
Either the power is off,
the controller has malfunctioned, or
the Test button is being pressed.
1
By sending a request from the Rover service tool, you can request the controller’s
green LED to blink (“wink”), a notification that the controller received the signal
and is communicating.
The yellow LEDs on the Tracer ZN517 unitary controller (see Figure 27
on page 73) indicate the controller’s communications status (see
Table 27).
Table 27. Yellow LED: Communications indicator
LED activity
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Explanation
LED is off continuously
The controller is not detecting any
communication (normal for standalone applications).
LED blinks.
The controller detects communication (normal for communicating
applications, including data sharing).
LED is on continuously.
Abnormal condition.
77
Diagnostics
In response to a diagnostic, the controller attempts to protect the equipment it is controlling by disabling all the outputs. When the diagnostic
clears, the controller resumes normal operation.
Diagnostic types
The Tracer ZN517 has two types of diagnostics: informational and automatic (also referred to as nonlatching). Informational diagnostics provide
information about the status of the controller. They do not affect machine
operation. They can be cleared from the controller in one of the following
ways:
•
•
•
•
By using the Rover service tool (see “Resetting a diagnostic” in
EMTX-SVX01B-EN, Rover Operation and Programming guide.)
Through a building automation system (see product literature)
By initiating a manual output test at the controller (see “Manual output test” on page 74)
By cycling power to the controller. When the 24 Vac power to the controller is cycled off and then on again, a power-up sequence occurs.
Automatic (nonlatching) diagnostics clear automatically when the problem that generated the diagnostics is solved.
78
CNT-SVX12C-EN
Diagnostics
Table of diagnostics
Table 28 describes each diagnostic that can be generated by the Tracer
ZN517.
Table 28. Diagnostics for the ZN517 unitary controller
Diagnostic
Probable cause
Consequences
Diagnostic
type
P Normal
Default value until power-up
control wait expires
None
N/A
Normal
Default value after power-up
control wait expires
None
N/A
Local Space Setpoint Failure
Invalid or missing value for
space setpoint
The controller uses default values.
Informational
Maintenance Required
The maintenance required
timer has expired
Informational warning only.
Informational
Local Fan Switch Failure
BI2 has not seen a contact
closure for 60 seconds, indicating fan proving
All binary outputs are disabled.
Automatic
CO2 Sensor Failure
CO2 input is invalid or
missing
Demand control ventilation is
disabled.
Automatic
Discharge Air Temp Failure
input is invalid or missing
Automatic
Invalid Unit Configuration
Invalid DIP switch setting
Controller will not operate.
Automatic
RH Sensor Failure
Relative humidity input is
invalid or missing
Dehumidification is disabled.
Automatic
Space Temperature Failure
Space temperature sensor
is invalid or missing
Automatic
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79
80
CNT-SVX12C-EN
Chapter 11
General wiring information
This chapter provides specifications and general information about wiring the Tracer ZN517 unitary controller. The controller requires wiring
for:
•
•
•
Input/output terminals
AC power to the controller
Communication-link wiring, if the controller is to communicate with a
building automation system (BAS)
Input/output terminal wiring
All input/output terminal wiring for the Tracer ZN517 unitary controller
is application specific and dependant on the configuration of the controller. For application-specific wiring information and diagrams, see Chapter
3, “Applications for the 2-heat/2-cool configuration”,” Chapter 5, “Applications for the 4-cool configuration”,” and Chapter 7, “Applications for the
heat pump configuration”.”
Wiring specifications
Input/output terminal wiring must meet the following requirements:
•
•
•
•
•
CNT-SVX12C-EN
All wiring must comply with the National Electrical Code and local
codes.
Use only 18 AWG twisted-pair wire with stranded, tinned-copper conductors. (Shielded wire is recommended.)
Binary input and output wiring must not exceed 1000 ft (300 m).
Analog input wiring must not exceed 300 ft (100 m).
Do not run input/output wires in the same wire bundle with any ac
power wires.
81
Chapter 11 General wiring information
HVAC unit electrical circuit wiring
The terminals labeled Rc and Rh are provided as inputs for 24 Vac power
from the transformer(s) of the HVAC system.
Note:
The Tracer ZN517 is shipped from the factory with terminals
Rc and Rh coupled with the jumper at J1 on the controller circuit board.
Packaged units
If the HVAC unit combines heating and cooling (referred to as a “packaged” unit), it will typically have one “R” transformer. For 24 Vac wiring
of packaged units, the Rc terminal must be wired as shown in this
procedure:
1. Locate the jumper at J1 on the controller circuit board (Figure 28 on
page 83). Place the jumper on both pins at J1 on the circuit board
(Figure 29 on page 83).
2. Wire the Rc terminal to the transformer on the unit (Figure 30 on
page 84).
Split systems
If the unit is a split system (a unit with physically separate heating and
cooling sections), there is typically a separate transformer for each function. For 24 Vac wiring of split systems, the Rc and Rh terminals must be
wired as show in this procedure:
1. Locate the jumper at J1 on the controller circuit board (Figure 28 on
page 83). Remove the jumper from the pins at J1 on the circuit board
2. Replace the jumper on one of the pins at J1 for possible future use.
3. Wire Rc to the transformer for the cooling section of the unit
4. Wire Rh to the transformer for the heating section of the unit
82
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Input/output terminal wiring
Figure 28. Location of J1 on Tracer ZN517 circuit board
J1 (location of
jumper for Rc,
Rh terminals)
Figure 29. Coupling and uncoupling terminals Rc and Rh for 24 Vac
wiring of the HVAC unit
For packaged units
Place the jumper on
both pins at J1.
CNT-SVX12C-EN
J1
For split systems
J1
Remove the jumper from
one of the pins at J1.
(Leave it on one of the pins
for possible future use.)
83
Figure 30. Wiring for packaged heating and cooling units
Primary
Secondary, 24 Vac
Fan
Tri-state
modulating
economizer
(optional)
Heat stage 1
Heat stage 2
24 Vac H
N
R
G
Y1 Y2 W1 W2
Generic binary output (dry contact)
Figure 31. Wiring for split system applications
Primary
Primary
Secondary, 24 Vac
Secondary, 24 Vac
Tri-state
modulating
economizer
(optional)
Fan*
Heat stage 1
24 Vac H
N
Heat stage 2
Rc Rh G Y1 Y2 W1 W2
Generic binary output (dry contact)
*Wire the fan (G) to the appropriate section of the split system.
84
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AC power wiring
AC power wiring
CAUTION
Equipment damage!
Complete input/output wiring before applying power to the Tracer
ZN517 unitary controller. Failure to do so may cause damage to the controller or power transformer due to inadvertent connections to power
circuits.
CAUTION
Hazardous voltage!
Make sure that the 24 Vac transformer is properly grounded. Failure to
do so may result in damage to equipment and/or minor or moderate
injury.
IMPORTANT
Do not share 24 Vac between controllers.
All wiring must comply with National Electrical Code and local codes.
The ac power connections are in the top left corner of the Tracer ZN517
unitary controller (see Figure 32).
Figure 32. Connecting ac power wires to the controller
H
24 Vac unit
transformer
N
If you are providing a new transformer for power, use a UL-listed Class 2
power transformer supplying a nominal 24 Vac (19–30 Vac). The transformer must be sized to provide adequate power to the Tracer ZN517 unitary controller (9 VA) and output devices, including relays and valve
actuators, to a maximum of 12 VA per output utilized. The Tracer ZN517
may be powered by an existing transformer integral to the controlled heat
pump, provided the transformer has adequate power available and adequate grounding is observed.
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85
Communication-link wiring and
addressing
The Tracer ZN517 unitary controller communicates with a BAS and with
other LonTalk controllers via a LonTalk communication link. For instructions on LonTalk communication wiring and addressing, follow the
requirements given in the Tracer Summit Hardware and Software Installation guide (BMTX-SVN01A-EN) or the Tracker Building Automation
System Hardware Installation guide (BMTK-SVN01D-EN) or another
BAS installation manual.
86
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Chapter 12
Troubleshooting
This chapter outlines some general troubleshooting steps that should be
performed if there is a problem with the operation of the equipment controlled by the Tracer ZN517 unitary controller. This chapter describes
some common problems; however, it cannot describe every possible
problem.
If you encounter operational problems with the Tracer ZN517, you must
first perform initial troubleshooting steps; see “Initial troubleshooting” on
page 88. After this procedure, consult the tables in “Diagnosing operational problems” on page 88 for further troubleshooting assistance.
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87
Chapter 12 Troubleshooting
Initial troubleshooting
Always perform the initial troubleshooting steps listed in Table 29 before
moving on to the specific area of trouble. Perform the steps in the order
they are listed.
Table 29. Initial troubleshooting steps
Step number
Action
Probable cause
Step 1
Look at the red Service LED. If it is flashing once per second, the controller is
not executing the application software because the network connections and
addressing have been removed. For a complete explanation of this LED’s
behavior, see Table 25 on page 76.
Use the Rover service tool or a BAS to restore normal operation. See EMTXSVX01B-EN for more information.
Tracer ZN517 is
not configured
Step 2
Look at the green Status LED. It should be on continuously during normal
operation. A blinking Status LED indicates the Tracer ZN517 is performing a
manual output test. For a complete explanation of this LED’s behavior, see
Table 26 on page 77.
Tracer ZN517 is in
manual output test
mode
Step 3
Take your meter (set to measure ac voltage) and measure the voltage across
the ac-power terminals on the Tracer ZN517 (with ac wires connected). See
Figure 32 on page 85.
If you see approximately 24 V (21–27 V) on those terminals, the board is
receiving adequate input power and you likely have a Tracer ZN517 circuit
board problem.
Tracer ZN517 circuit board problem
Step 4
Disconnect the ac wires from the input power terminals. Take your meter (set
to measure ac voltage) and measure the voltage across the ac wires. If you
see approximately 0 V, the board is not receiving the power it needs to run.
Input power problem
Step 5
Reconnect the ac wires to the input power terminals. Perform the manual
output test, which is described in “Manual output test” on page 74.
If the outputs on the controller do not behave as described in the manual
output test (page 74), then you are likely to have a Tracer ZN517 circuit board
problem.
Tracer ZN517 circuit board problem
Diagnosing operational problems
After you have performed the initial troubleshooting steps, refer to the
succeeding tables in this chapter to further diagnose the following operational problems:
•
•
•
•
88
Fan does not energize (Table 30 on page 89)
Heat does not energize (Table 31 on page 90)
An outdoor air damper stays closed (Table 32 on page 90)
An outdoor air damper stays open (Table 33 on page 91)
CNT-SVX12C-EN
Table 30. Fan does not energize
Probable cause
Explanation
Unit wiring
The wiring between the controller outputs and the fan relays and contacts must be
present and correct for normal fan operation. Refer to applicable wiring diagram.
Failed end device
The fan motor and relay must be checked to ensure proper operation
Random start
observed
After power-up, the controller always observes a random start from 0 to 25 seconds. The
controller remains off until the random start time expires.
Power-up control-wait
If power-up control-wait is enabled (non-zero time), the controller remains off until one of
two conditions occurs:
1) The controller exits power-up control-wait once it receives communicated information.
2) The controller exits power-up control-wait once the power-up control-wait time expires.
Cycling fan operation
If configured to cycle with capacity, normally the fan cycles off with heating or cooling.
The heating/cooling sources cycle on or off periodically with the fan to provide varying
amounts of capacity to the zone.
Unoccupied operation
Even if the controller is configured for continuous fan operation, the fan normally cycles
with capacity during unoccupied mode. While unoccupied, the fan cycles on or off with
heating/cooling to provide varying amounts of heating or cooling to the space.
Fan mode off
If a local fan mode switch determines the fan operation, the off position controls the fan
off.
Requested mode off
You can communicate a desired operating mode (such as off, heat, and cool) to the controller. If off is communicated to the controller, the unit controls the fan off. There is no
heating or cooling.
Diagnostic present
For information about diagnostics, see Table 28 on page 79.
No power to the controller
If the controller does not have power, the unit fan does not operate. For the Tracer ZN517
controller to operate normally, it must have an input voltage of 24 Vac. If the green LED is
off continuously, the controller does not have sufficient power or has failed.
Unit configuration
The controller must be properly configured based on the actual installed end devices and
application. If the unit configuration does not match the actual end device, the valves may
not work correctly.
Manual output test
The controller includes a manual output test sequence you can use to verify output operation and associated output wiring. However, based on the current step in the test
sequence, the unit fan may not be on. Refer to the “Manual output test” on page 74.
CNT-SVX12C-EN
89
Table 31. Heat does not energize
Probable cause
Explanation
Unit wiring
The wiring between the controller outputs and the electric heat contacts must be present
and correct for normal electric heat operation. Refer to applicable wiring diagram.
Failed end device
Check electric heat element, including any auxiliary safety interlocks, to ensure proper
operation.
Normal operation
The controller controls electric heat on and off to meet the unit capacity requirements.
Requested mode off
You can communicate a desired operating mode (such as off, heat, and cool) to the controller. If off is communicated to the controller, the unit shuts off all electric heat.
Unit configuration
Check to make sure unit is not in the 4-cool configuration.
Communicated disable
Numerous communicated requests may disable electric heat, including an auxiliary heat
enable input and the heat/cool mode input. Depending on the state of the communicated
request, the unit may disable electric heat.
Manual output test
sequence, the electric heat may not be on. Refer to the “Manual output test” on page 74.
Diagnostic present
No power to the controller
If the controller does not have power, electric heat does not operate. For the ZN517 controller to operate normally, you must apply an input voltage of 24 Vac. If the green LED is
off continuously, the controller does not have sufficient power or has failed.
Table 32. Outdoor air damper remains closed
Probable cause
Explanation
Unit wiring
The wiring between the controller outputs and the outdoor air damper must be present
and correct for normal outdoor air damper operation. Refer to applicable wiring diagram.
Failed end device
Check damper actuator to ensure proper operation.
Normal
operation
The controller opens and closes the outdoor air damper based on the controller’s occupancy mode and fan status. Normally, the outdoor air damper is open during occupied
mode when the fan is running and closed during unoccupied mode.
Warm up and cool
down
The controller includes both a morning warm up and cool down sequence to keep the
outdoor air damper closed during the transition from unoccupied to occupied. This is an
attempt to bring the space under control as quickly as possible.
Requested mode off
You can communicate a desired operating mode (such as off, heat, or cool) to the controller. If off is communicated to the controller, the unit closes the outdoor air damper.
Manual output test
sequence, the outdoor air damper may not be open. Refer to the “Manual output test” on
page 74.
Diagnostic present
90
CNT-SVX12C-EN
Table 32. Outdoor air damper remains closed (Continued)
Probable cause
Explanation
Unit configuration
application. If the unit configuration does not match the actual end device, the outdoor air
damper may not work correctly.
No power to the
controller
If the controller does not have power, the outdoor air damper does not operate. For the
ZN517 controller to operate normally, you must apply an input voltage of 24 Vac. If the
green LED is off continuously, the controller does not have sufficient power or has failed.
Table 33. Outdoor air damper remains open
Probable cause
Explanation
Unit wiring
The wiring between the controller outputs and the outdoor air damper must be present
and correct for normal outdoor air damper operation. Refer to applicable wiring diagram.
Failed end device
Check damper actuator to ensure proper operation.
Normal
operation
The controller opens and closes the outdoor air damper based on the controller’s occupancy mode and fan status. Normally, the outdoor air damper is open during occupied
mode when the fan is running and closed during unoccupied mode.
Manual output test
sequence, the outdoor air damper may be open. Refer to the “Manual output test” on
page 74.
Unit
configuration
application. If the unit configuration does not match the actual end device, the outdoor air
damper may not work correctly.
CNT-SVX12C-EN
91
92
CNT-SVX12C-EN
Index
Numerics
Exhaust fan output, 31
Fan off delay, 43
Fan operation, 41
Fan status, 43
Fan status input, 32
Filter-maintenance timer, 43
Generic binary input, 32
Generic binary output, 31
Manual output test sequence, 75
Occupancy modes, 38
Occupancy or generic input, 32
Occupancy output, 31
Outdoor air damper operation, 40
Peer-to-peer data sharing, 41
Required and optional components,
28
Required and optional inputs and
outputs, 28
Sequence of operations, 37–43
Temperature setpoint input, 36
Timed override control, 40
Unit protection strategies, 42
Wiring diagram, 29
Zone temperature input, 36
24 Vac wiring, 85
Analog inputs, 15–18
Binary inputs, 14
Binary output 5 (5NO/5COM/5NC),
13
Binary outputs, 13–14
Demand control ventilation, 24
DIP switch settings, 12
Discharge air temperature input, 17
Discharge air tempering, 24
Economizing, 17, 23
Fan off delay, 25
Fan operation, 23
Fan status, 25
Manual output test sequence, 75
Occupancy modes, 20
Outdoor air damper operation, 22
Required and optional components,
10
Required and optional inputs and
outputs, 10
Wiring diagram, 11
4-cool configuration
Binary inputs, 32
Binary output 5 (5NO/5COM/5NC),
31
Binary outputs, 31
Discharge air temperature input, 35
Economizing, 35, 41
CNT-SVX12C-EN
A
AC power wiring, 85
Actuator
Minimizing activity with error
deadband, 69
Actuators, damper, 6
Additional application-dependent
components, 6
Agency listing/compliance, 4
Analog inputs
AI1 (Universal 4–20 mA), 15, 33, 51
AI1 configuration options, 15, 33,
51
AI1 configured for CO2
measurement, 16, 34, 52
AI1 configured for RH
measurement, 16, 34, 52
AI1 generic configuration, 15, 33, 51
AI2 (Outdoor air or generic
temperature), 17, 35, 53
AI2 configuration options, 17, 35, 53
93
Index
AI2 generic temperature
configuration, 17, 35, 53
Generic temperature, 17, 35, 53
Analog inputs, 2-heat/2-cool
DAT (Discharge air
temperature), 17
SET (Temperature setpoint), 18
Table, 15
ZN (Zone temperature), 18
Analog inputs, 4-cool
DAT (Discharge air
temperature), 35
Table, 33
Analog inputs, heat pump
DAT (Discharge air
temperature), 53
Table, 51
Binary outputs
2-heat/2-cool, 13–14
4-cool, 31
Configuration options for binary
output 5 (5NO/5COM/5NC), 13,
31, 49
Heat pump, 49
Binary outputs, 2-heat/2-cool
Exhaust fan, 13
Generic, 13
Occupancy, 13
Overriding, 14
Table, 13
Binary outputs, 4-cool
Exhaust fan, 31
Generic, 31
Occupancy, 31
Overriding, 31
Table, 31
Binary output 5 (5NO/5COM/5NC)
2-heat/2-cool, 13
4-cool, 31
Heat pump, 49
94
Derivative control, 65
Diagnosing operational problems,
87–91
Dimensions, 1
Compressor operation, 59
DIP switch settings
2-heat/2-cool configuration, 12
4-cool configuration, 30
Economizing, 17, 35, 53
Heat pump configuration, 48
C
Binary inputs, heat pump
BI1 (Occupancy or generic), 50
BI2 (Fan status), 50
Table, 50
Derivative calculation, PID loops, 65
Compliance
Applications, 4-cool, see 4-cool
configuration
Binary inputs, 4-cool
Table, 32
Demand control ventilation, 24, 42,
60
Dimensional diagram, 3
Building automation system
communication, 1, 86
Binary inputs, 2-heat/2-cool
Table, 14
Damper actuators, 6
CO2 measurement input, 16, 34, 52
Applications, 2-heat/2-cool, see 2heat/2-cool configuration
BAS communication, 1, 86
D
Circuit board
Diagram, 73
jumper (J1) location, 83
Applications
Heat pump, 45
Rooftop units, 9, 27, 31
Split systems, 9
B
Configurations
2-heat/2-cool, 9–25
4-cool, 27–43
Heat pump, 45–62
Diagnostics
Automatic, 78
CO2 Sensor Failure, 16, 34, 52,
79
Disable generation of, 15, 33, 51
Discharge Air Temp Failure, 79
General, 78
Informational, 78
Invalid Unit Configuration, 79
Local Fan Switch Failure, 14, 32,
50, 79
Local Space Setpoint Failure, 18,
36, 54, 79
Maintenance Required, 25, 43,
62, 79
Nonlatching, 78
Normal, 79
P Normal, 79
RH Sensor Failure, 16, 34, 52, 79
Space Temperature Failure, 18,
19, 36, 37, 54, 55, 79
Table, 79
Types, 78
Binary outputs, heat pump
Exhaust fan, 49
Generic, 49
Occupancy, 49
Overriding, 49
Table, 46, 49
Applications, heat pump, see Heat
pump configuration
Binary output 5 (exhaust fan,
occupancy, or generic), 13, 31,
49
Calculations
In PID loops, 64–65
2-heat/2-cool, 20
4-cool, 38
Heat pump, 56
CE, see Agency listing/compliance
Configuration options
AI1 (Generic, CO2, or RH), 15,
33, 51
AI2 (Outdoor air or generic
temperature), 17, 35, 53
BI1 (Occupancy or generic), 14,
32, 50
Direct action of PID loops, 68
Discharge air temperature input
CNT-SVX12C-EN
Index
sensors, 6
H
Discharge air tempering, 24, 42, 60
Heat failure, troubleshooting, 90
HVAC split systems
Wiring, 82
Wiring diagram, 84
Heat pump applications, 45
Components, 49
HVAC unit electrical circuit wiring,
82–84
E
Economizing, 17, 23, 35, 41, 53, 60
Equipment
Rooftop units, 13
Split systems, 13
Error deadband, 69–70
Adjusting for modulating
outputs, 69
Adjusting for staged outputs,
69–70
F
Fan off delay, 25, 43, 62
Fan status, 25, 43, 62
Fan status input
Fans
Operation, 23, 41, 59
Troubleshooting, 89
Filter-maintenance timer, 25, 43, 61
Free cooling, see Economizing
G
Gains
Changing, to troubleshoot
specific problems, 72
Generic
Temperature input, 17, 35, 53
Generic binary input
2-heat/2-cool, 14
4-cool, 32
Heat pump, 50
Generic binary output
2-heat/2-cool, 13
4-cool, 31
Heat pump, 49
GND terminal, analog inputs, 15,
33, 51
Grounding power transformers, 85
CNT-SVX12C-EN
Heat pump configuration
Binary inputs, 50
Binary output 5 (5NO/5COM/
5NC), 49
Binary outputs, 49
Discharge air temperature input,
53
Economizing, 53, 60
Fan off delay, 62
Fan operation, 59
Fan status, 62
Heating or cooling mode, 59
Manual output test sequence,
76
Occupancy modes, 56
Outdoor air damper operation,
58
Required and optional
components, 46
Required and optional inputs
and outputs, 46
Reversing valve operation, 59
Wiring diagram, 47
I
Input/output terminal wiring, 81
Integral calculation, PID loops, 64
Integral control, 64
J
Jumper (J1) location, 83
L
LEDs
General, 73
Interpreting green (status), 77
Interpreting red (service), 76
Interpreting yellow
(communications), 77
Location, 73
LonTalk communication, 86
Description, 1
LonTalk protocol, see LonTalk
communication
M
Manual output test, 74–76
Manual output test sequence
2-heat/2-cool, 75
4-cool, 75
Heat pump, 76
Mounting
Cover, 8
Diagram, 8
Location, 7
Operating environment, 2
Procedures, 8
Humidity
Measurement input, 16, 34, 52
N
HVAC packaged units
Wiring, 82
Wiring diagram, 84
National Electrical Code, 81, 85
95
Index
O
Error deadband, 69–70
Integral calculation, 64
Managing with additional
settings, 71
Overview, 63
Proportional calculation, 64
Reverse action, 68
Sampling frequency for
calculations, 65–67
Tips for specific problems, 72
Troubleshooting, 71–72
Occupancy modes, 2-heat/2-cool
General, 20
Occupied, 21
Occupied bypass, 22
Occupied standby, 21
Unoccupied, 21
Occupancy modes, 4-cool
General, 38
Occupied, 39
Occupied bypass, 40
Unoccupied, 39
Occupancy modes, heat pump
General, 56
Occupied, 57
Occupied bypass, 58
Unoccupied mode, 57
Occupancy or generic input
Operating environment, 2
Outdoor air damper
Operation, 22, 40, 58
Outdoor air damper remains closed
Troubleshooting, 90
Outdoor air damper remains open
Troubleshooting, 91
Power requirements, 2, 4
Power transformers, 6
Power wiring, 85
Power-up sequence, 19, 37, 55
Product description, 1
Proportional calculation, PID loops,
64
Proportional, integral, derivative
(PID) loops, see PID loops
Protection strategies
2-heat/2-cool, 24
4-cool, 42
Heat pump, 61
R
Rc, Rh terminal wiring, 82–84
Coupling and uncoupling with
jumper, 83
Outdoor air or generic temperature
Input, 17, 35, 53
Reverse action of PID loops, 68
Outdoor air temperature input, 17,
35, 53
Rooftop units, 9, 13, 27, 31
2-heat/2-cool, 14
4-cool, 31
General, 74
Heat pump, 49
Rover service tool, 1, 4, 13, 18, 20,
21, 22, 23, 24, 25, 31, 36, 38, 39,
40, 41, 42, 43, 49, 54, 56, 57, 58, 60,
61, 62, 63, 74, 76, 77, 78, 88
Rover, 1
Overshooting the setpoint, 63
S
P
Peer-to-peer data sharing, 23, 41, 61
PID loops, 63–72
Action, 68
Calculations, 64–65
Definition, 63
Derivative calculation, 65
Direct action, 68
Effects of aggressiveness, 63
96
Sampling frequency, 65–67
Changing, to troubleshoot
specific problems, 72
see LonTalk communication, 86
Sensors
Application-specific, 15, 33, 51
CO2, 16, 34, 52
Discharge air temperature, 6, 20,
38, 56
Occupancy, 14, 32, 50
Table of options, 6
Zone humidity, 16, 34, 52
Zone temperature, 6
Sequence of operations, 2-heat/2cool
Economizing, 23
Fan off delay, 25
Fan operation, 23
Fan status, 25
Occupancy modes, 20
22
Power-up sequence, 19
Sequence of operations, 4-cool
Economizing, 41
Fan off delay, 43
Fan operation, 41
Fan status, 43
Occupancy modes, 38
40
Sequence of operations, heat pump
Economizing, 60
Fan off delay, 62
Fan operation, 59
Fan status, 62
Heating or cooling mode, 59
Occupancy modes, 56
58
CNT-SVX12C-EN
Index
Fans, 89
Heat failure, 90
Initial steps, 88
Outdoor air damper remains
closed, 90
Outdoor air damper remains
open, 91
PID loops, general, 71–72
PID loops, specific problems, 72
Service Pin button
Function, 74
Location, 73
Setpoint, controlling with PID loop,
63
Settings
PID loops, 71
2-heat/2-cool, 20
4-cool, 38
Heat pump, 56
Specifications
Agency listing/compliance, 4
Dimensional diagram, 3
Dimensions, 1
Input/output terminal wiring, 81
Power requirements, 2, 4
Storage environment, 4
Transformers, 85
Split systems, 9, 13
Status indicators for operation and
communication
General, 73
Green LEDs, 77
Manual output test, 74
Red LEDs, 76
Service Pin button, 74
Test button, 73, 74
Yellow LEDs, 77
Storage environment, 4
T
Temperature sensors
Discharge air, 6
Table of options, 6
Zone, 6
Temperature setpoint input
2- heat/2-cool configuration, 18
Test button
Function, 73
Location, 73
Thermistor, 54
2-heat/2-cool, 22
4-cool, 40
Heat pump, 58
Z
Zone temperature input
Zone temperature sensors, 6
U
UL, see Agency listing/compliance
Universal 4–20 mA, 15, 33, 51
W
Wiring
AC power, 85
Compliance with National
Electrical Code, 81, 85
Connecting ac power, 85
General, 81–86
HVAC packaged units, 82
HVAC packaged units, diagram,
84
HVAC split systems, 82
HVAC split systems, diagram, 84
HVAC unit electrical circuit,
82–84
Input/output terminals, 81
LonTalk communication, 86
Network communication, 86
Requirements and options for 2heat/2-cool configuration, 10
Requirements and options for 4cool configuration, 28
Requirements and options for
heat pump configuration, 46
Wiring diagram
Transformers, 6, 85
Troubleshooting
CNT-SVX12C-EN
97
Index
98
CNT-SVX12C-EN

Installation and Operation Tracer ZN517 Unitary Controller - Cul-tech

Transcription

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