INSTANTANEOUS GAS WATER HEATER GWI-N

Transcription

INSTANTANEOUS GAS WATER HEATER
GWI-N
ROOM SEALED FAN PRESSURIZED GAS WATER
HEATER FOR INDOOR AND OUTDOOR
INSTALLATION
TRAINING AND SERVICE INFORMATION FOR AFTER SALES
This document is restricted to exclusive use by the official service partners. Each
country should adapt the manual and its contents to the available range.
Page 1 from 63
6 720 815 216 SM FP Europe PT-ES-IT 2015/01 en
Contents
1.
INTRODUCTION ..............................................................................................3
2.
APPLIANCE DESCRIPTION ............................................................................3
2.1
2.2
APPLIANCE DESIGNATION...................................................................................................... 3
AVAILABLE ACCESSORIES ..................................................................................................... 4
3.
INSTALLATION ................................................................................................5
3.1
3.2
3.3
3.4
APPLIANCE FIXATION ON THE WALL ........................................................................................ 5
WATER CONNECTIONS ........................................................................................................... 6
GAS CONNECTION ................................................................................................................. 6
APPLIANCE PERFORMANCE.................................................................................................... 7
4.
COMPONENTS OVERVIEW ............................................................................8
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
4.10
4.11
4.12
CONTROL PANEL................................................................................................................... 8
HEAT CELL WITH BURNER PIPES ........................................................................................... 10
GAS MANIFOLD ................................................................................................................... 12
FAN ................................................................................................................................... 14
GAS VALVE ........................................................................................................................ 15
HEAT EXCHANGER .............................................................................................................. 16
WATER INLET ASSY ............................................................................................................ 17
WATER TEMPERATURE SENSORS ......................................................................................... 18
BOX TEMPERATURE SENSOR ............................................................................................... 18
WATER FLOW SENSOR..................................................................................................... 19
IGNITION ELECTRODE ....................................................................................................... 20
IONIZATION ELECTRODE .................................................................................................... 22
5.
WORKING PRINCIPLE / ELECTRIC MEASUREMENTS ............................ 23
6.
SERVICE ....................................................................................................... 28
7.
MAINTENANCE ............................................................................................. 41
8.
TROUBLE SHOOTING .................................................................................. 44
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1. Introduction
This manual is a complement to the instruction/operation manual delivered with the
appliance, with the main important technical details that are relevant for the official service
partners and trainers in the country. In any case one of the documents replaces the use of
the other.
2. Appliance description
Junkers, Elm Leblanc
Bosch, Vulcano
Pict.1 – Brand Design
2.1
Appliance Designation
This appliance is a fan pressurized gas water heater, which will replace the actual room
sealed range of appliances offering a wider range of modulation and installation
advantages.
Brand
Junkers
Bosch
ELM Leblanc
Vulcano
Nefit
Designation
WTD 12/15/18 AM E 23/31
GWH 12/15/18 CTD F6 E23/31
LC 12/15/18 HFP N/B
WTD 12/15/18 AM E 23/31
Nefit 12/15/18 VE
Table 1 – Appliance identification
For each brand, according to the market definition, indoor and outdoor models can be
available.
Page 3 from 63
2.2
Available accessories
Remote control
Possible wired connection to both indoor (optional accessory) and outdoor versions
(included in packaging).
Direct connection to the outside of the appliance with neither the need of configuration, nor
a connection inside of the room sealed box.
Pict. 2 – Remote control connection to the appliance
Pict. 3 – Remote Control with cable, connectors
and instruction manual
Anti-Freeze kit
Allows the protection of the appliance against water freezing inside of its pipes until -20ºC.
Used in cases where ambient temperature can be lower than 5ºC
Pict. 4 – Anti-Freeze Kit
The kit includes 8 resistances of 16W each, which activate under conditions from table 3.
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Activation
T in ≤ 2ºC
or
T box ≤ 5ºC
Deactivation
T in ≥ 5ºC
and
T box ≥ 10ºC
Table 2 – Anti-freeze activation conditions
3. Installation
The installation manual of each product must be checked and used by the installer in order
to optimize and leave the appliance in correct operation conditions.
Check lists for technicians/installers:
3.1
Appliance fixation on the wall
Requisite
Confirmation
Appliance is levelled and in the vertical position?
Delivered accessories are used accordingly?
Appliance is supported exclusively by the wall fixation and
not by hydraulic and/or gas connections?
Table 3 – Check List for Fixation
The carton box of the appliance shall be used as a pre-installation chart, in order to mark
the correct wall fixation and water inlet pipe positions.
Pict.5 – Pre-installation chart in Box
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Pict. 6 – Wall Fixation Preparation
3.2
Water connections
Requisite
Water pipes were cleaned before
connected to the appliance?
Leakage test was done
successfully?
Inlet water filter was checked and is
cleaned, ensuring the necessary
water flow?
Accessories for water connections
are adequate?
Water pressure and flow are
according to the appliance
specifications?
Observations
Confirmation
- Nominal pressure: 1- 4 bar
- Minimum pressure: 0,15 bar
- Maximum pressure: 12 bar
Table 4 – Check list hydraulic connections
3.3
Gas connection
Requisite
The appliance is suitable for the available gas type?
Pressure reducer and gas pipe are adequate for the required pressure and
gas flow?
Accessories for gas connection are adequate and according to the country
specification/standards?
Table 5 – Check list for gas connections
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Confirmation
gas
manometer
Pict. 7 – Manometer pipe connection to measure static/dynamic gas supply pressure
3.4
Appliance performance
Measure water flow and temperature increase to check temperature and instantaneous
water flow, assuring correct operation of the appliance.
Pict. 8 – Use of water flow meter and thermometer
Page 7 from 63
4. Components Overview
1 – Collector
2 – RSF box
3 – Heat exchanger
4 – Heat cell
5 – Burner
6 – Fan
7 – HMI
8 – Flow switch
9 – Gas valve
10 – Gas inlet
11 – Water inlet
12 – Water outlet
Pict.9 – Internal view of Indoor and Outdoor models
4.1
Control panel
The control panel allows the user, installer or technician, to perform all different operations
needed.
Junkers, ELM Leblanc
Bosch, Vulcano
Pict.10 – Control Panel Overview
Page 8 from 63
On / Off button
The main switch is assembled on
the PCB and disconnects phase-L
from neutral-N.
No voltage at components if the
main switch is in OFF-position
Note: Errors reset function when
pressed for more than 3 seconds
Program Button
Used to enter in different services:
- Enter in service mode
- Scroll in the service mode menu
- Save value or adjust set values
- Save a temperature set (user)
Selection button
Used to select temperature values,
adjustments and navigation on
parameters inside the visualisation
mode.
Table 6 – Control Panel Buttons
Symbol
Description
Observation
Temperature Unit:
ºC – default value
ºF – alternative value
Selection can be done by changing
default value on service mode (P6)
Power bar indicator:
Indication of the current operation
power
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Indicative Value (in %)
Flame indication:
Indication of flame in the burner
Symbol displayed when ionization is
detected - flame presence
Warning symbol:
Combined with an error indication
/ warning code indicates a faulty
performance
Tap symbol:
Indication of not enough power to
reach set point
Solar application:
Indication that the automatic solar
function is activated, meaning that
the appliance is receiving preheated inlet water, with no need
for burner to start
In case symbol is displayed,
decrease (-) or increase (+) flow
accordingly
The symbol is displayed and burner
is shutdown when T in is under
following conditions:
T in ≥ T set – 1K
The symbol is deactivated and
burner restarted when:
T out < 60ºC (if T set ≤ 50ºC)
T out < T set + 10ºC (if T set > 50ºC)
Fan operation:
Indication that the fan is in
operation
Table 7 – Display Symbols
4.2
Heat cell with burner pipes
The heat cell includes the flame visualization window, ignition electrode, ionization
electrode and the burner pipes.
Inlet: Primary air from the fan and gas from the gas manifold.
Outlet: Hot combustion gases to the heat exchanger
Page 10 from 63
Pict.11 – Heat cell
Pict.12 – Burner pipe
Primary air plate
The primary air plate is assembled between the heat cell and the gas manifold in order to
ensure the correct mixture of air and gas according to the specific appliance model.
Stamp
Butane / Propane
12l/min
12L-LPG
15l/min
15L
18l/min
18L-NG
18L-LPG
Identification of primary air plates (FD < 312)
Appliance
Natural gas
12L-NG
Stamp
Butane / Propane
12l/min
12L
15l/min
15L
18l/min
18L
Identification of primary air plates (FD > 417 with SW AF0106)
Appliance
Natural gas
Table 8 – Identification of primary air plates
Page 11 from 63
The plate has indexation pins that ensure the correct assembly on the heat cell and the
type gas mark orientation to the front.
WTD18
WTD15
WTD12
Pict. 13 – Primary air plate
4.3
Gas manifold
The gas manifold is a gas distribution pipe with integrated drilled injectors and two
pressure measuring points:
-
gas valve pressure = Pburner
air fan pressure = Pbox
The manifold cover allows the gas supply to the burner over 2 different segments, in order
to assure a wide modulation range according to the capacity of the appliance.
Burner segment 2
Injectors
Burner segment 1
Pict. 14 – Gas manifold for 12l/min appliance with 9 injectors (Ø 1.7 for NG / Ø 1.3 for LPG)
Page 12 from 63
Injectors
Burner segment 2
Burner segment 1
Pict.15 – Gas manifold for 15l/min appliance with 11 injectors (Ø 1.7 for NG / Ø 1.3 for LPG)
Injectors
Burner segment 2
Burner segment 1
Pict.16 – Gas manifold for 18l/min appliance with 15 injectors (Ø 1.7 for NG / Ø 1.3 for LPG)
Page 13 from 63
Gas Pressure
Measurement point
=
P burner
Air Pressure
Measurement point
=
P box
Pict.17 – Pressure measuring points
4.4
Fan
The control unit monitories the primary air flow to the burner by varying the fan motor
power supply voltage (DC), ensuring a correct variable speed during the operation
according to the output needed.
The fan motor provides an additional control signal to enable/disable operation and the
speed of the fan is measured by the feedback signal provided by the fan’s motor. The
signal consists on a square wave with a frequency proportional to the speed of the fan.
WTD 12
WTD 15
WTD 18
WTD 18
FD < 453 (sw < AF0106)
FD ≥ 453 (sw ≥ AF0107)
Pict. 18 – Different fan flanges (12, 15 and 18l/min models)
Page 14 from 63
4.5
Gas Valve
Over the control unit it is possible to control the gas flow to the burner by the modulating
gas valve (MV1). The gas valve is composed by other three solenoids identified as safety
valves (SV1 + SV2 + SV3) releasing the modulated gas to and from the solenoid gas
valve.
Safety solenoid valve
The safety valve 1 (SV1) is the first safety element that releases gas to the burner. Safety
valves 2 (SV2) and 3 (SV3) are the second safety level elements, that release gas to the
first and second burner segments, respectively, acting as safety and segmentation valves.
2nd Burner
Segment
1st Burner
Segment
MV1
SV2
SV3
SV1
Pict. 19 – Gas Valve
Modulating valve
Mechanical modulated valve
The Gas flow (thermal load) is automatically modulated in order to ensure the correct hot
water set temperature, under water flow or temperature variations.
Switchover valve
The burner is composed by 2 segments which are fed according to the solenoid valves
activation (SV1 and/or SV2) which can be switched over according to the different thermal
load, in order to obtain a stable combustion. These valves ensure the most suitable
condition under the control of microcomputer, based on the values detected by the water
flow sensor and hot water thermal fuse.
Page 15 from 63
Burner
segment 2
SV3
Burner
segment 1
SV2
MV1
SV1
Pict.20 – Gas valve / burner scheme
4.6
Heat Exchanger
The copper heat exchanger has 61, 75, 92 fins, according to the appliance model (12, 15
and 18l/min). This configuration ensures the sealed heat transfer from the flame heat to
the water that flows through the copper pipes.
Pict.21 – Heat exchanger
Page 16 from 63
4.7
Water Inlet Assy
The inlet water valve contains the water connection of ¾” that integrates also the filter and
the flow restrictor according country characteristics.
Pict.22 – Inlet Water Valve
Flow Restrictor / Filter
The flow restrictor has a mesh filter integrated and is easily identified by a colour
depending of the water flow.
Pict.23 – Inlet flow restrictor with filter
ES
PT
NL
BE
FR
IT
WTD
12
red
12 l/min
natural
8 l/min
green
7 l/min
yellow
5 l/min
Orange
9 l/min
natural
8 l/min
WTD
15
lime
15 l/min
brown
11l/min
natural
8 l/min
natural
8 l/min
brown
11l/min
brown
11l/min
WTD
18
grey
18 l/min
lime
15 l/min
Blue
10 l/min
Orange
9 l/min
lime
15 l/min
lime
15 l/min
Table 10 – Identification of water flow restrictors
Page 17 from 63
4.8
Water temperature sensors
The outlet and inlet water temperature is measured by a 10kΩ NTC (See table 15). Both
NTC are equal, but connected to different cable colors (blue wires to inlet water / red wires
to outlet water).
Pict.24 – Temperature sensor
4.9
Box Temperature sensor
The Box air temperature is measured by a 220kΩ NTC (See table 14) and is assembled
on the control unit back panel, in order to monitor the temperature inside of the room
sealed box.
Pict.25 – Box air temperature sensor
Page 18 from 63
4.10 Water Flow Sensor
Water flow is measured by a turbine flow sensor that is fed by a DC signal, proportional to
the measured water flow.
-
Flow rate to operate the appliance: 2.2 l/min
Flow rate to shut off the appliance: 1.8 l/min
Turbine signal
f
Q=-----4
Q: water flow (l/min)
F: frequency (PPS-Pulse per Second)
Pict.26 – Turbine / Water Flow Sensor
In case Q > 2.2l/min following Pout verification occurs:
- If Pout > Minimum Power, the appliance will run with the calculated minimum water
flow, in order to reach the set point with a temperature stability of + / - 1ºC;
-
In case T set + 10ºC, burner will shut down.
Page 19 from 63
Flow
[l/min]
Frequency
[Hz]
15
102.9
14
95.2
13
88.4
12
81.6
11
74.8
10
68.7
9
61.2
8
54.4
7
47.6
6
40.8
5
34.0
4
27.2
3
20.4
2
13.6
Table 11 – Water flow sensor values
4.11 Ignition electrode
Spark generation is started immediately before opening the gas valve, and stopped when
ionization is sensed.
Pict.27 – Ignition electrode
In order to prevent harder ignition processes and be sure of conditions of gas supply and
burner stability, following situation is verified during the so called safety time period.
In each of the attempts, the system monitors the ionisation signal; this signal drives the
start of normal operation, however and, in case the ionization signal is not detected during
the ignition sequence, the failure indication EA will be displayed. In this case a non-volatile
lock-out is activated, and only a manual reset can lead the system back to normal
Page 20 from 63
operation. If the ionisation signal is interrupted during normal operation, this ignition
sequence is re-started.
Fan
Ignition spark
st
1 Ignition Sequence
Safety Time = 29 sec
st
1 Attempt
(5 sec)
nd
Purge Period
(3 sec)
2 Attempt
(5 sec)
+
Purge Period
(3 sec)
rd
3 Attempt
(5 sec)
+
Pos Purge
(8 sec)
+
nd
2 Ignition Sequence Safety Time of 29 sec
st
1 Attempt
(5 sec)
+
Page 21 from 63
Purge Period
(3 sec)
nd
2 Attempt
(5 sec)
Purge Period
(3 sec)
rd
3 Attempt
(5 sec)
+
+
Pos Purge
(8 sec)
rd
3 and last Ignition Sequence Safety Time of 31 sec
st
1 Attempt
(5 sec)
Purge Period
(3 sec)
nd
2 Attempt
(5 sec)
Purge Period
(3 sec)
rd
3 Attempt
(5 sec)
EA Error
Code
Pos Purge *
(15 sec)
+
+
+
* Note: Pós fan operation was changed so the post-purge time of 15 sec for models with SW >
AF0107 from is 3 min (fixed time after demand visible with fan icon in display).
Note: In order to reduce the waiting time and improve the comfort, the run-on time of the fan has been increased
from 15 sec. to 3 min. The appliance is start-ready during 3 min with the fan run-on time and during this period, the
fan works with the lowest speed and sound pressure level. From SW > AF0111 the Pu mode was added to allow
option between default 3 min to 15 sec.
4.12 Ionization electrode
Flame is sensed through an ionization electrode, and detection is granted for ionization
currents [higher than 0.8 µA]
Pict.28 – Ionization electrode
Pict.29 – Ignition / ionization electrodes position on the burner
Page 22 from 63
5. Working Principle / Electric Measurements
Water Flow Detection and solar mode operation
Solar mode Operation
Water Flow Calculation
procedure
Burner On
Burner Off
T out < 60ºC
(if T set ≤ 50ºC)
T in ≥ T set – 1K
WF = Power
(T set – T in)
WF < 1.8 l/min
WF ≥ 2.2 l/min
Burner OFF
Burner ON
Operation
Action
Standby
(Inputs Signals must be
within expected limits)
or
T out < Tset +
10ºC
(if T set > 50ºC)
Connection to
the control unit
Result
Main Switch in control unit
Input
ON
Electrical plug connected
Input
230 V AC
Thermal fuse with continuity
Input
Contact closed
Ionization reading
Input
Temperature sensors OK
Input
Turbine detects water flow
Input
Spark to ignition electrodes
Output
Gas valve solenoid activation
Output
V DC
Flame on main burner
Ionization detection (spark stops)
Input
I > 0.8 µA
Hot Water Delivery
Safety devices monitor operation
Input
Hot Water Demand
(tap opening)
Table 12 – Operation conditions
Page 23 from 63
0 µA
Ohm Value inside
range
Frequency value to
control unit
1 – Ionization electrode
8 – Solenoid Valve (SV3 – Burner)
2 – Fan
9 – Solenoid Valve (SV2 – Burner)
3 – Ignition electrode
10 – Thermal fuse
4 – Electrical supply
11 – Water flow sensor
5 – Remote control connection
12 – Air Box temperature NTC
6 – Solenoid Valve (MV1 – Modulation)
13 – Outlet water temperature NTC
7 – Solenoid Valve (SV1 – Safety)
14 – Inlet water temperature NTC
Pict.30 – Electric Diagram
Page 24 from 63
ID
11
Component
Description
Measuring Wire
Colours
Value
Remarks
Red-Black GND
5 VDC
Control power
On: ≥ 2.2l/min
Off: ≤ 1.8/min
Water flow sensor
Yellow-Black GND
≈ 2.4 VDC
(pulse frequency ~Hz)
Note: see table 11 to check
correspondence between water flow
vs frequency signal
Multimeter for resistance measurement
R (Ω)
Circuit open – Not Ok
(infinity – no continuity)
White cable – White cable
10
Thermal Fuse
(actuation
temperature:
114ºC)
12
Air Box
temperature
NTC
13
Outlet water
temperature
NTC
Circuit closed – Ok
(0 Ohm – continuity)
See corresponded values in table
14
See corresponded values in table
15
14
Inlet water
temperature
NTC
Table 13 – Electric Values
Operating Temperature (ºC)
-10
-5
0
5
10
15
Page 25 from 63
Resistance (KΩ)
1373
1034
784.7
600.0
462.1
358.4
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
105
110
279.9
220.0
174.0
138.5
110.9
89.24
72.24
58.78
48.08
39.51
32.63
27.07
22.56
18.88
15.87
13.39
11.34
9.642
8.228
Table 14 – NTC resistance values for Air Box NTC
Operating
Temperature (ºC)
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
105
110
R min
(KΩ)
30.34
23.674
18.617
14.749
11.768
9.454
7.644
6.218
5.089
4.188
3.466
2.883
2.410
2.009
1.683
1.416
1.197
1.016
0.866
0.741
0.637
0.549
0.475
R nominal
(KΩ)
30.40
25.902
20.247
15.950
12.657
10.115
8.138
6.589
5.367
4.398
3.624
3.002
2.500
2.092
1.759
1.486
1.260
1.074
0.918
0.788
0.680
0.588
0.510
R max (KΩ)
36.47
28.129
21.878
17.151
13.547
10.777
8.632
6.959
5.646
4.608
3.782
3.122
2.590
2.175
1.835
1.555
1.323
1.131
0.970
0.836
0.722
0.627
0.545
Table 15 – NTC resistance values for water temperature NTC’s
Page 26 from 63
Component
Description
ID
1
Ionization
Electrode
Measuring Wire
Colours
Value
Multimeter in position for
current measurement, with
White wire to ionization scale for µA range of values
electrode
Ionization current > 0.8 µA
Brown-Blue GND
2
Combustion fan
6
Mechanically
modulated valve
(MV1)
Red-Red
7
Main solenoid valve
(SV1)
Blue-Blue
8
Solenoid valve (SV3)
Black-Black
9
Solenoid valve (SV2)
White-White
Supply power
~ 10.8 – 13.2 V DC
Controlling power
DC~V
(pulse frequency ~ Hz)
~ 0 – 12 V DC
Current = 0 – 220 mA
Resistance ~ 80 Ω
~ 20.4 – 24 V DC (open)
0 – 3.6 V (close)
Resistance ~ 99.7 Ω
~ 20.4 – 24 V DC
0 – 3.6 V (close)
~ 20.4 – 24 V DC
0 – 3.6 V DC (close)
Feedback from hall
sensor
Table 16 – Measurements and values
SV2 – White Wires
SV3 – Black Wires
SV1 – Blue Wires
MV1 – Red Wires
Pict.31 – Gas Valve Solenoids
Page 27 from 63
Note: Cables
connected in serial
between ionization
cable from control
unit and electrode.
~ 0 – 45 V DC
Orange-Blue GND
Yellow-Blue GND
Remarks
Modulation Valve
Inlet Safety Valve
Burner Segment 2
Burner Segment 1
In order to ensure a correct start up of the appliance and a correct function after any
intervention on the appliance, the installation manual must be read and instructions and
main functions must be explained to the end user.
Table 16 indicates the method and values for testing the main components function and,
consequently, ensure a correct and safe operation of the appliance.
6. Service
When replacing the control unit, configurations need to be checked and set accordingly.
Pict.32 – HMI
Attention:
Control units are supplied as spare part with following default values:
-
20 = Natural Gas (see P7)
-
12 liters appliance operation (see AP on P4)
Pict.33 – Confirmation of HMI configuration (gas type)
Note: only for appliances with sw < AF 0106
Page 28 from 63
Pict.34 – Confirmation of HMI configuration (gas type)
Attention: factory settings highlighted / 25 & 28 not applicable for IT, PT, ES
Note: only for appliances with sw ≥ AF 0106
Pict.35 – Confirmation of HMI configuration (appliance type)
Page 29 from 63
Note: In case of replacement of control unit, register P1 and P2 values from the existent unit
configuration.
Procedure to enter in Service Mode:
-
Press and hold "Program", “+” and “-“ buttons for more than 3 seconds;
As soon as '188' is displayed, release buttons, till the display indicates P2.
From this position and using the selection buttons “+” and “-“, different service modes can
be assessed.
Pict.36 – Service mode entry procedure
Page 30 from 63
P0
Gas valve
adjustment
See Combustion gas power
adjustments section
for more details
P1
Maximum Power
Set point
Normal Mode
P2
Minimum Power
P3
Remote Control
Registration
P4
Diagnostic mode
See table with
parameters
P5
Ignition Startup delay
P6
Temperature Unit
Selection
P7
Gas Type Selection
20 = G20 (Ø 1.7)
30 = G30 (Ø 1.3)
31 = G31 (Ø 1.3)
> SW AF0106
25 = G25 (Ø 1.8)
28 = G20 (Ø 1.8)
P8
Back light activation
P9
Fan Purge
PA
Calibration of
components
Table 17 – Service Mode Parameters List (1st level)
Page 31 from 63
* only > SW AF0106
** only > SW AF0107
*** only > SW > AF0111
rP *
Reset to factory default
values
…
SC
Set Point Calibration
AS**
Altitude Adjustment
Setpoint
Normal Mode
P2
Minimum Power
Pu ***
Purge selection
…
AP
Appliance Power
P4
Diagnostic mode
…
E
Exit
0D
Set point
1D
Inlet Temperature
2D
Outlet Temperature
3D
Water Flow
5D
Box air temperature
1F – 10F
Last recent failures
AL
Show All Segments
Table 18 – P4 Diagnostic Mode Parameters List (2nd level)
Page 32 from 63
Gas Power Adjustment Parameters
The adjustment of the appliance for minimum / maximum power operation can be needed under
following conditions:
- Gas Conversion (see correspondent manual);
- Gas valve replacement;
- Start up of unit when need to operate with Propane (LPG models are adjusted on
factory for Butane).
Following image indicates the 2 measurement points to be used:
Gas Pressure
Measurement Point
Fan Pressure
Measurement Point
Measurable values:
- P burner
- P0
- P1 – L1
- P2 – L2
Measurable values:
- P box
- P1 – A1
- P2 – A2
Pict.37 – P0 / P1 / P2 adjustment measurement points
Pict.38 – Gas Manometer Connection
Page 33 from 63
Technician Level
Comments
The value measured when in
P0 should be 1.2 mbar
Range of value in control unit is from 0
to 40
Table 19 – P0
The P1 mode can be accessed in the service mode, depending on the adjustment and/or
confirmation need. Check parameters according gas and model type and check results
according to the manual – ensure constant result (P burner – P box = P L1 – P A1)
To keep the appliance in P1 (maximum power adjustment), is important to assure a minimum
water flow, otherwise the appliance will jump automatically to P2 (minimum power).
WTD12: Flow > 4 l/min
Table 20 – Minimum water flow needed to keep P1
Maximum Power adjustment
Technician Level
Comments
Maximum power burner
adjustment after repairs /
maintenance / gas
conversions
P1 contains the fan speed setting (A1)
and gas power (L1) at maximum power
(depends on gas type / model)
When P1 is visible, press “P” and enter in the 2
for enter and/or exit P1
Maximum Input Power
Page 34 from 63
nd
level accessing “E”
Not Used (by default will display 20)
Adjustment of air flow without
change gas conditions
Range from 0 to 40
Adjustment of gas flow
without change air conditions
Range from 0 to 40
Adjustment of flow meter
(only > sw AF0106)
Note: included in PA for
control units > SW AF0111
Open hot water to start appliance and
entering in P1 – AC press P checking
the water flow (l/s x 10).
Appliance will shut off while calibration
is being done until inlet and outlet NTC
measure same temperature and water
flow start blinking.
Press P to finish.
Table 21 – P1 sub menus
Values in P1 mode are settled according to the appliance selection and gas type from
factory. To check default value or to change parameter, press “Program” button when
inside of P1.
Model
ΔP1 (mbar)
ΔP2 (mbar)
WTD12
WTD15
WTD18
WTD12
WTD15
WTD18
Natural Gas
G20 = 20 mbar
4.8 – 5.2
5.1 – 5.5
4.1 – 4.5
0.6 – 0.8
0.7 – 0.9
0.8 – 1.0
Butane
G30 = 28-30 mbar
4.6 – 5.0
4.8 – 5.2
4.1 – 4.5
0.6 – 0.8
0.7 – 0.9
0.7 – 0.9
Propane
G31 = 37 mbar
5.5 – 5.9
6.3 – 6.7
5.0 – 5.4
0.7 – 0.9
0.8 – 1.0
0.8 – 1.0
Table 22 – Values measured on gas manometer
The P2 mode can be accessed in the service mode, depending on adjustment and/or
confirmation need. Check parameters according gas and model type and check results
according to the manual – ensure constant result (Pburner – Pbox = PL2 – PA2)
Page 35 from 63
Minimum Power
adjustment
Technician Level
Comments
Minimum power burner
adjustment after repairs /
maintenance / gas
conversions
P2 contains the fan speed setting (A2)
and gas power (L2) at maximum power
(Minimum gas and water flow)
When P2 is visible, press “P” and enter in the 2
for enter and/or exit P1
nd
level accessing “E”
Minimum Input Power
Not Used (by default will display 20)
Adjustment of air flow without
change gas conditions
Range from 0 to 40
Adjustment of gas flow
without change air conditions
Range from 0 to 40
Table 23 – P2 sub menus
Remote control registration
Installer Level
Technician Level
Comments
No use
Table 24 – P3
The access to the data visualization mode, is made by entering first in the “service mode”
and then, scrolling to the parameter “P4” of the adjustment mode.
Page 36 from 63
Diagnostic mode and
visualization mode
Installer Level
Technician Level
This mode helps the
installer in the startup
to check parameters
such as water flow
through the appliance
and inlet / outlet
temperatures
This mode helps the
technician to find some
information useful to
adjust and to check
functionality of the
appliance.
Comments
Main recommendation is
to perform always a check
on the last 10 failures in
memory in order to
analyze eventual
problems in installation
that might need to be
corrected
Table 25 – P4
By pressing the “P” button while the display shows “P4”, the LCD will enter into
visualization mode and will show “E”, meaning “Exit” from the visualization mode. By
pressing “P” button again, the LCD will show “P4”, i.e. the visualization mode has been
exited.
After entering into data visualization mode (showing “E”) and then pressing “+” or “-”
button, the parameter and failure visualization fields can be selected as shown in table 5.
Sequence of
Parameters in P4
Comment
Value / Unit
Entry / Exit of visualization mode
Possible change of set point
without leave service mode and
perform any needed control
Temperature indication
Inlet water temperature
Temperature indication
Hot water temperature
Water flow indication
l/min ( ±0.5l/min )
ºC or ºF
Temperature read by inlet sensor
ºC or ºF
Temperature read by outlet sensor
ºC or ºF
Indicates water flow measured by the
turbine (l/min)
Not existing
Temperature of air in room sealed
box
Page 37 from 63
Temperature read by outlet sensor
ºC or ºF
until
Last 10 Failures for diagnostic
purposes
Failure 1 is last failure occurred
Failure 2 occurred before Failure1
Test Display
Visualization of all segments of text
display (LCD)
Reset to Factory default values
(only sw > 0106)
SC = Set Point Calibration
AS = Altitude Adjustment
(only sw > 0107)
(default value depends of TTNR
and destination Country)
Purge time definition
(only sw > 0111)
Appliance Power definition
Allows the reset of P1 and P2 for the
default values memorized from
factory and individually.
Enter this mode and select P1 or P2
according need and press P for reset
(+/- 3 sec)
Internal Compensation of set point
defined by user in order to
compensate temperature loss until
last consumption point
Value can be adjusted from:
set point -5ºC
to
set point +5ºC
(ºC by ºC)
1= sea level to 500 m
2= 500 m to 1000 m
3= 1000 m to 1500 m
4= 1500 m to 2000 m
5= 2000 m to 2500 m
6> 2500 m
Allows the change of time for pospurge time between:
- 3 min (at min fan speed)
or
- 15 sec (at normal fan
speed)
Parameter for control unit adaptation
according appliance model
(modulation range)
12 = WTD12
15 = WTD15
18 = WTD18
Table 26 – Visualization mode parameters
Page 38 from 63
Start-up delay Activation
Press the button until P5 appears and press Program button “P” to define a time frame for
the activation of the appliance when the appliance is installed as a backup for a solar
installation. Press and hold Program button until CC blinks on the display.
Start up delay
Default Value
______
(Note: from 0 to 60 sec)
Comments
The value defined here is defined in seconds
and will create a delay in the startup sequence
in order to allow pre-heated water to reach
appliance without unnecessary burner
activation when water is hot.
Table 27 – P5
Temperature Unit selection
To change the temperature unit, enter first into the service mode and then scroll to the
parameter “P6”. By pressing the “P” button while the display shows “P6”, the LCD will
enter into temperature selection unit mode and show “C” which indicates “Celsius degree”.
Pushing “+” or “-” button, the LCD will show “F” which indicates “Fahrenheit degree”.
Temperature unit selection
Default Value
ºC
Possible
Selection
Comments
ºF
To set one of these units it
is necessary to store the
value. For that, press
program button until the
desired option flashes on
the display
Table 28 – P6
To change the gas type, enter first into the service mode and then scroll to the parameter
“P7”. This parameter allows the control of the modulation range according to the gas type.
In order to ensure a proper operation of the appliance, this parameter must be checked
when the control unit is replaced.
Appliance Type selection
Page 39 from 63
Comments
Setting:
20 – Natural Gas G20
(with injectors of 1.7)
30 – Butane G30
31 – Propane G31
From sw > 0106
(not used for IT,PT,ES)
25 – Natural Gas G25
28 – natural Gas G20
Table 29 – P7
Backlight activation
Default Value
Possible
Selection
Comments
dE
(deactivated)
ON
Allows the activation of the
backlight of the LCD
Table 30 – P8 Backlight in LCD
Purge mode
Comments
To set one of these units it is necessary to store the value. For
that, press program button until the desired option flashes on the
display
Table 31 – P9 Purge
Adjustment of flow meter*
Only > sw AF0111
Open hot water to start appliance and
entering in P1 – AC press P checking
the water flow (l/s x 10).
Appliance will shut off while calibration
is being done until inlet and outlet NTC
measure same temperature and water
flow start blinking.
Press P to finish.
Table 32 – PA Calibration of components
* Note: Only needed if flow sensor is replaced
Page 40 from 63
7. Maintenance
To ensure continued efficient operation of the appliance, it is recommended that it is
checked and serviced as necessary at regular intervals. The frequency of servicing will
depend on the particular installation conditions and use profile, but in general, once a year
should be adequate.
Any intervention / service work in the appliance must be carried out by a competent person
such as registered and competent technician. Before any service operation, turn off the
gas supply at the main gas service cock upstream. Carry out the service operation as
described in the manual.
The service partners have all necessary accessories and tools for the interventions.
L641 – O’rings in contact with water
HFt1 v5 – Gaskets in contact with gas
Pict.39 – Recommended lubricants for connections
Cleaning the filter
For the cleaning of the filter, first loose the clip (2), than remove the cover (3) that is fixed
in the body of water valve – see picture 38. Pull the water flow restrictor with integrated
filter from the front to the outside of the water assy. Clean the filter with water and / or air
pressure and assemble it back on the water.
Page 41 from 63
Pict.40 – Water filter removal
Inspect and clean the heat exchanger when needed. To remove the heat exchanger,
isolate the appliance from incoming cold water supply at the inlet cock. Open the taps to
release any remaining water pressure and drain the appliance over the water assy cover (3) in picture 38.
Pict.41 – Heat exchanger cleaning
Take care not to damage the seals that ensure tightness between the heat exchanger, the
heat cell and collector and ensure correct clearing and alignment of the fins.
In hard water regions it may be necessary to descale the heat exchanger body, using a
proper descaler. Fill the heat exchanger with the descaling solution and let it act until the
solution stops bubbling. Drain and thoroughly wash out the exchanger with clean water.
Page 42 from 63
Warning: Acid/water solutions must be used with extreme caution. Take care not to
splash on to the skin or into the eyes. Wash any affected areas with large amounts of cold
water and seek medical advice.
Pict.42 – heat exchanger descaling
Re-assemble the heat exchanger ensuring its correct position on the two support hooks in
the appliance back plate, good conditions of sealings and tightness between heat
exchanger, collector and burner.
Pict.43 – heat exchanger
Replacement of Parts
Any service work must be carried out by a competent person such as the technician
indicated by the after sales organization. Before any service operation, turn off the gas
supply at the main gas service cock.
Page 43 from 63
8. Trouble Shooting
Error
Code
A0
A1
A4
A7
A9
C1
C7
CA
CF
E0
E1
E2
E4
E9
Description
Both Inlet and outlet NTC temperature sensors are
damaged (open / short circuit)
High temperature detected by NTC inside the box (T box
> 70ºC)
Air Box NTC temperature sensor defected (open or short
circuit)
Outlet water NTC temperature sensor defected (open or
short circuit)
Output below expected value / Outlet sensor not
assembled correctly (safe mode operation)
Insufficient air flow at start up
Fan unplugged / no detection of rotation/speed signal
from fan
Water flow signal over specified maximum value (flow >
25 l/min)
Blocked exhaustion / Combustion failure
Control Unit damage:
Ionization circuit test fault / Software error
Over-temperature detected in hot water outlet sensor (T
out > 85ºC)
Inlet water NTC temperature sensor defected (open or
short circuit)
Air Box NTC temperature sensor protection by over
temperature detection (T air > 80ºC)
Thermo fuse opened circuit (overheat – T=114ºC)
EA
No ionization detected during safety time (safety time
with 3 + 3 + 3 trials elapsed)
EE
Modulating Solenoid disconnected
EF
High Output (wrong gas type)
F7
Ionization error (flame sensing during stand-by)
FA
FC
F9
Leakage error on gas valve when ionization is detected
after demand finish
Buttons pressed more than 30 sec
Safety Solenoid disconnected
Type
Lockout
(manual reset)
Warning
(reset by closing water)
Lockout
(self reset when conditions corrected)
Warning
Warning
Lockout
(self reset by closing water)
Lockout
Warning
(self reset by reducing water flow)
Lockout
(self reset by closing water)
Lockout
(manual reset)
Warning Lockout
(Self-Reset when T < 60ºC)
Warning
Lockout
(manual reset)
Lockout
(manual reset)
Lockout
(manual reset)
Self reset when solved
Lockout
(manual reset)
Lockout
(manual reset)
Lockout
(manual reset)
Self-reset when button released
Lockout
(manual reset)
Table 33 – Error code list
Page 44 from 63
8.1) Problems without error codes
Combustion noise too high
Gas supply type according
appliance gas type ?
No
Convert appliance according IM
(check existence of EF codes in
memory)
Yes
Gas supply pressure (static /
dynamic) according IM ?
No
In case of need
contact gas supplier
Assure gas supply pressure,
testing appliance at
maximum and minimum
Yes
Check exhaustion system for
eventual recirculation of
combustion products (cross
contamination)
Problem solved ?
End
Clearances for air admission
/ flue discharge according IM
/ Sealing between flue pipes
and appliance
No
Measure CO2 value (at flue
measurement point) in
maximum power with /
without front cover
Without Front Cover
CO2 (G20 / 25) ≈ 5.5% (+/-0.2%)
CO2 (G30) ≈ 6.8% (+/-0.2%)
CO2 (G31) ≈ 6.6% (+/-0.2%)
Emissions according
specification ?
No
Cross contamination
persist / Combustion
not ok
Yes
Temp gases máx ≈ 170ºC
Temp. gases min ≈ 45ºC
With Front Cover
Máx CO2 = CO2 without front
cover + 0.3 %
ATTENTION:
Adjustments of ΔP are done
without front cover
ΔP1 (mbar)
ΔP2 (mbar)
Page 45 from 63
End
ATTENTION:
CO2 > nominal = flue
recirculation
CO2 increasing > 0.3%
difference from cover Off to
cover On = flue recirculation
Model
WTD12
WTD15
WTD18
WTD12
WTD15
WTD18
Natural Gas
4.8 – 5.2
5.1 – 5.5
4.1 – 4.5
0.6 – 0.8
0.7 – 0.9
0.8 – 1.0
Adjust appliance by
confirming ΔP1 / ΔP2)
Note: check air / gas
measurement
independently to be
sure reading is ≠ 0 and
then check ΔP
Butane
4.6 – 5.0
4.8 – 5.2
4.1 – 4.5
0.6 – 0.8
0.7 – 0.9
0.7 – 0.9
Propane
5.5 – 5.9
6.3 – 6.7
5.0 – 5.4
0.7 – 0.9
0.8 – 1.0
0.8 – 1.0
Strong Ignition Noise
Noise produced during start
up upon a demand.
Intermittent spark
generation?
Yes
No
Noisy Solenoids
activation?
Yes
Check contact between
connector of ignition
wires and electrode.
Replace it in case of
need and inspect
electrode
Normal noise (component
characteristic)
No
Yes
Front Cover deflection?
Re-check minimum
power adjustment.
No Startup / Ignition Spark
Appliance remains in standby
and without start ignition
sequence even with tap open
Clean eventual debris /
dirtiness in tap
Water flow below
minimum specified value
(Min. water flow > 2.2
l/min)
)
Yes
Low water flow due dirty
outlet in tap?
No
Remove purge cap and
disconnect inlet connection
to inspect and clean inlet
filter
Yes
Low water flow due to
blocked appliance inlet
filter?
No
Check turbine connections
in control unit and in water
flow sensor.
Remove water flow sensor
and check if turbine spins.
Measure signals:
Red – Black (input): 5 V dc
Yellow – Black (output): 2.4 V dc
Yes
Water flow above minimum
specified value and confirmed
with water flow meter?
Signal from turbine?
Refer to spare part list and
replace turbine
Yes
Turbine ok but ignition
transformer damaged?
Page 46 from 63
No
Refer to spare part list and
replace control unit
8.2) Problems with Error Codes
A0
Fault in both inlet and outlet NTC sensor
Component Characteristic: NTC temperature sensor (10 kΩ type)
Lock Out Error
Burner shutdown and manual reset necessary
The Inlet / Outlet NTC
sensor is interrupted
or in short circuit
Ensure NTC wire is
attached in NTC sensor
Refer to table with
values in Service
Manual
Unplug Wires and measure
the NTC electrical
resistance [R] (Ω)
[R] > 30 kΩ or < 0.5 kΩ
ATTENTION:
Red wires – outlet NTC
Blue wires – inlet NTC
No
[R] = ∞ Ω
Yes
Yes
NTC values out of
range
See spare part list
NTC interrupted
Replace NTC
No
Plug NTC connection
wire and turn ON unit
Problem solved?
Yes
No
See spare part list
End
Change wiring
Yes
Problem solved?
No
Replace control unit
Page 47 from 63
A1
Temperature inside room sealed box and detected by air flow NTC sensor is > 70ºC
Component Characteristic: NTC temperature sensor (220 kΩ type)
Warning Message Appliance keeps operation and code is flashing until tap is
closed
Temperature inside
box is high
Check position of sensor (attached
at back cover of control unit)
Yes
NTC out of place and
touching hot surface ?
Refer to table with
values in Service
Manual
Correct position and fix
NTC in original position
No
Power Reduction
Procedure
Start condition:
T air > 70ºC
Power lower in 5 % / 30 sec
Stop Condition:
T air < 70ºC
Measure the NTC electrical
[R] Ω = Current T air (ºC) ?
No
Note: when maximum power
reduction is 20 % or T air > 80ºC
E4 is displayed
Yes
Replace wiring
Check origin of high
temperature inside box
See spare part list
Evidences of leakages
through sealing’s or HE
overheat?
No
Yes
Heat Cell includes heat
exchanger sealing with
burner / flue collector
Page 48 from 63
Correct problem by
inspecting and/or
replacing gaskets /
sealings in Heat Cell
End
A4
Fault in the air flow NTC sensor
Component Characteristic: NTC temperature sensor (220 kΩ)
Lock Out Error
Burner shutdown
The Air NTC sensor is
interrupted or in short
circuit
Assure NTC cable harness is connected
in control unit
Refer to table with
values in Service
Manual
Unplug the NTC connection and measure
the NTC electrical resistance [R] (Ω)
[R] > 1300 kΩ or < 8.2 kΩ
No
[R] = ∞ Ω
Yes
Yes
NTC values out of
range
See spare part list
NTC interrupted
Change wiring
No
Plug connection wire
and turn ON unit
Problem solved?
Yes
No
See spare part list
End
Change wiring
Yes
Problem solved?
No
Page 49 from 63
A7
Fault in the outlet water temperature sensor
Component Characteristic: NTC contact temperature sensor
Warning Message Appliance keeps operation and code is flashing
The Outlet NTC
sensor is interrupted
or in short circuit
Ensure NTC wire is
Refer to table with
values in Service
Manual
the NTC electrical
[R] > 30 kΩ or < 0.5 kΩ
ATTENTION:
Red wires – outlet NTC
No
[R] = ∞ Ω
Yes
Yes
NTC values out of
range
See spare part list
NTC interrupted
Replace NTC
No
Plug NTC connection
Problem solved?
Yes
No
See spare part list
End
Change wiring
Yes
Problem solved?
No
Page 50 from 63
A9
The hot or cold water temperature sensor is not sensing the expected temperature
Component Characteristic: NTC temperature sensor
Warning Message Appliance keeps operation and code is displayed and
keeps flashing until tap is closed for self reset
The Inlet / Outlet NTC
sensor is not
measuring the
expected temperature
Unplug the NTC connection wire
in both inlet / outlet sensors
Refer to table with
values in Service
Manual
resistance [R] (Ω) in both
sensors
Safe Mode Procedure
Start condition:
1. After 30 sec from start up a
misreading temperature is
detected
2. After 2 min of output < 30%
A9 is displayed (no message
if output ok before 2 min)
[R] Ω = Current Temp.
(ºC) ?
No
Replace Sensor
Yes
Check assembly location on hot water pipe (NTC with red wires) /
cold water pipe (NTC with blue wires) and assure sensor tip is in
contact with pipes (straight surface / not in elbows)
Test appliance and water
stability. Problem solved?
Yes
End
No
Measure dynamic gas
pressure and check
pressure regulator in bottle
Confirm gas type - Inlet Gas
pressure too low ?
Problem solved?
Yes
No
Recommend different gas
bottle location / regulator
according output power of
appliance
Gas type is LPG
(butane) and bottle is
freezing / lower output?
No
Gas manifold is correct?
(check GN / GPL mark in
injectors distribution
pipe)
Page 51 from 63
Check also the ΔP1 /
ΔP2 values
CF
Combustion failure detected
Characteristic: Primary Fan (DC Centrifugal Fan)
Lock Out Error
Burner shutdown / self reset when closing water
Air Flow Estimation
Procedure
Start condition:
1. Airflow estimation should be
achieved in +/- 20 % in 30 sec
2. Lockout after 1 min of
inadequate air flow
High Resistance in flue
exhaustion / not enough air
admission
Total vent length according
specification?
End
Refer to Installation Manual
Concentric: L max = L pipes +
L equiv elbows
Parallel: L max = L pipes
intake + L equiv elbows + L
pipes exhaust
No
Yes
Yes
Flue terminal is within
clearances from adjacent
walls/ceiling as stated in
manual?
No
Correct exhaustion
system. Problem
solved?
Yes
No
No
Obstruction in flue path?
Obstruction in appliance?
Yes
Yes
Check if air restrictor in fan is
correct / ensure sealing
between fan and burner is not
creating obstruction
See spare part list
Sealing in flue collector /
extension pipes joining
are obstructing the air
admission.
Problem solved?
End
Without Front Cover
CO2 (G20 / 25) ≈ 5.5% (+/-0.2%)
CO2 (G30) ≈ 6.8% (+/-0.2%)
CO2 (G31) ≈ 6.6% (+/-0.2%)
Page 52 from 63
No
Possible misadjustment of P1 / P2
With flue gas analyzer
check CO2 correcting
A1 / A2
In case of need, reset P1 / P2
values and re-adjust appliance
with help of flue gas analyzer
and ΔP values
C1
Insufficient air flow at start up
Characteristic: Primary Fan (DC Centrifugal Fan)
Lock Out Error
Burner shutdown / self reset by closing water
Air Flow Estimation
Procedure
Start condition:
1. Airflow estimation should be
achieved in +/- 20 % in 20 sec
High Resistance in flue
exhaustion / not enough air
admission
Total vent length according
specification?
Refer to Installation Manual
Concentric: L max = L pipes +
L equiv elbows
Parallel: L max = L pipes
intake + L equiv elbows + L
pipes exhaust
End
No
Yes
Yes
Flue terminal is within
clearances from adjacent
walls/ceiling as stated in
manual?
No
Correct exhaustion
system. Problem
solved?
Yes
No
No
Obstruction in flue path?
Obstruction in appliance?
Yes
Yes
Check if air restrictor in fan is
correct / ensure sealing
between fan and burner is not
creating obstruction
See spare part list
Sealing in flue collector /
extension pipes joining
are obstructing the air
admission.
Problem solved?
End
Without Front Cover
CO2 (G20 / 25) ≈ 5.5% (+/-0.2%)
CO2 (G30) ≈ 6.8% (+/-0.2%)
CO2 (G31) ≈ 6.6% (+/-0.2%)
Page 53 from 63
No
Possible misadjustment of P1 / P2
With flue gas analyzer
check CO2 values
correcting A1 / A2
In case of need, reset P1 / P2
values and re-adjust appliance
with help of flue gas analyzer
and ΔP values
C7
No rotational speed sensor signal from primary fan
Characteristic: Primary Fan (DC centrifugal fan)
Lock Out Error
appliance enters in lock out immediately
Fan unplugged / cables
disconnected or not correctly
attached
Check bad wire connection in the
connector in the back cover of
control unit
Yes
Problem solved?
No
End
Measure output signal from
control unit
No signal from control unit to
fan?
Yes
Brown – Blue: 0 – 45 V dc
Orange – Blue: 10.8 – 13.2 V dc
Yellow – Blue: pulse frequency
No
Defective Fan
Defective Control Unit
Replace Fan
Replace Control Unit
Page 54 from 63
CA
Excessive water flow (over specified value > 25 l/min)
Characteristic: Water flow sensor (turbine)
Water flow signal > 172.5 Hz
Excessive water flow through
water heater
Remove inlet water
connection and check
existence of water flow
restrictor / filter
Refer to table in service
manual with color code / flow
per model and correct it.
No
Yes
End
Problem solved?
No
Water pressure
excessive
E0
Check need for water
pressure reducer valve
Software / hardware failure in control unit
Characteristic: Control Unit
Lock Out Error
Yes
Permanent error code?
Defective control unit
No
Yes
Wrong connections in cables?
Correct Connections
Yes
Error code after interface
manipulation?
Page 55 from 63
Yes
Turn Off and On Unit.
Problem persist?
E1
Over temperature detected by the NTC sensor in the hot water pipe (T out > 85 ºC)
Characteristic: NTC Temperature Sensor
Warning Message Appliance shutdown burner operation but self reset when T
out < 60ºC
Check water flow with a
water flow meter
Flow of water is very low
Clean filter and check if water flow
restrictor is according specification
Problem solved?
No
Unplug the NTC connection
wire in outlet sensor
Refer to table with
values in Service
Manual
[R] Ω = Current Temp.
(ºC) ?
No
Replace Sensor
Yes
Problem solved?
No
Appliance installed as
a solar backup unit?
Yes
Maximum inlet appliance is 60ºC –
ensure existence of thermostatic
mixing valve before unit
No
Error code self reset
when temperature
decrease and appears
repetitively?
Page 56 from 63
Yes
Maximum power very high
E2
Failure in the inlet water temperature sensor
Component Characteristic: NTC Temperature sensor
The inlet NTC sensor
is interrupted or in
short circuit
Ensure NTC wire is
Refer to table with
values in Service
Manual
the NTC electrical
[R] > 30 kΩ or < 0.5 kΩ
ATTENTION:
Blue wires – inlet NTC
No
[R] = ∞ Ω
Yes
Yes
NTC values out of
range
See spare part list
NTC interrupted
Replace NTC
No
Plug NTC connection
Problem solved?
Yes
No
See spare part list
End
Change wiring
Yes
Problem solved?
No
Page 57 from 63
E4
Air box NTC sensor detect high temperature inside room sealed box (Tbox > 80ºC)
Characteristic: NTC Temperature sensor
Lock Out Error
Temperature inside
box reach high limit
(Tbox > 80ºC)
Burner shutdown but self reset by closing water
Check position of sensor (attached
at back cover of control unit)
Yes
NTC out of place and
touching hot surface ?
Refer to table with
values in Service
Manual
Correct position and fix
NTC in original position
No
[R] Ω = Current T air (ºC) ?
No
Yes
Replace wiring
Check origin of high
temperature inside box
See spare part list
Evidences of leakages
through sealing’s or HE
overheat?
No
End
Yes
Yes
Heat Cell includes heat
exchanger sealing with
burner / flue collector
Correct problem by
inspecting and/or
replacing gaskets /
sealings in Heat Cell
Problem solved?
No
Check CO2
emissions and reduce
power in L1 / A1 to
correct ΔP1
Page 58 from 63
Excessive burner
power
E9
Failure in the thermal fuse that opens circuit (Temp = 114 ºC)
Characteristic: Thermal fuse (located at control unit back cover)
Lock Out Error
Permanent open
circuit due to over
temperature
Burner shutdown and manual reset needed after repair
Thermal fuse damaged
(melts at 114ºC)
Yes
Measure continuity:
R = ∞?
Replace sensor (see
spare part list)
Check origin for high
temperature occurrence
Inspect main heat
exchanger – fins
obstructed?
EE
Yes
Remove part and
clean external fins
Modulating solenoid (MV1) disconnected (Note: only SW version > 0106)
Characteristic: electro-valve
Lock Out Error
No current for
modulation solenoid
Check cables connection to
MV1 (red cables)
Yes
End
Problem solved?
No
Minimum Power too low
(ΔP of P2)
Page 59 from 63
Adjust P2 (increase L2 value
and A2 proportionally). In
case problem persists, leave
ΔP2 higher than value in IM.
EA
No ionization signal detected in the burner
Characteristic: Gas Valve + Electrodes
Lock Out Error
Burner shutdown after safety time elapsed (3 + 3 + 3 tentative)
Information about ionization
Ionization current at standby = 0 µA (initial condition for startup ignition sequence)
With the appliance working, the normal value is ≈ 6 µA (condition for detection by control unit > 0,8 µA)
Sequence is identified below:
P – Purge / I – Ignition
Startup ->
I (5s) -> P (3s) -> I (5s) -> P (3s) -> I (5s) -> P (8s) -> Total time of 29 sec
Lock Out indication “EA”
No flame in the
burner?
Yes
Yes
No
Spark is visible?
Yes
Gas supply closed?
Open gas cock to the
appliance
No
Yes
Contact gas supplier or
check gas meter and
safety shut off valve
No gas at apartment?
No
Problem solved?
Measure static inlet gas
pressure
Ensure gas flow
according model power
No
Gas valve not releasing
gas to burner
Safety Gas valve
connections
disconnected?
Yes
Assure Connection and
measure resistance
SV1 – Blue Wires (≈ 100Ω)
SV2 – White Wires (≈ 100Ω)
SV3 – Black Wires (≈ 100Ω)
No
Solenoid signal to open
is not ok?
Measure Voltage signal
(Between 20 – 24 V dc)
Yes
In case of defective
solenoid, refer to spare
part list and replace
gas valve
Replace control Unit
Failure in spark due to
a defective / damaged
electrode
Ensure the 2 red ignition wires
are in contact and connected to
control unit / electrode
Problem
solved?
Yes
Page 60 from 63
No
End
Replace ignition
wires / electrode
Flame presence not
detected
Spark is ok and flame is
visible, but appliance shut off
and tries to re-ignite?
Yes
Ionization sensor
touching burner / metal
part?
Yes
Verify the correct assembly of
electrode
No
Ionization cable is
disconnected /
damaged?
Yes
Verify and assure cable is
connected and in contact with
electrode (black wire). In case
of need replace wiring.
No
Incorrect adjustment in
speed of the fan for
minimum power (check
P0 / P2
Ensure P7 / P4-AP is
correctly defined
Flame is not a blue steady
one and is lifting?
Yes
Lean flame – decrease A2
value and increase L2
EF
Output of appliance is too high (Note: only SW version > 0106)
Lock Out Error
NG (G20) appliance
connected to LPG
(G30/31)
Check Gas type of
appliance and gas
supply
Gas supply different
from gas type on
appliance ?
Yes
Convert appliance –
refer to spare part list
and use defined kit
No
Note: all control unit as
spare parts are supplied
as NG (G20 in P7) and
12 in AP
Appliance power defined
in P4 – AP is not
according capacity ?
Yes
Enter service mode and
check / correct
adjustment.
No
Appliance gas type
defined in P7 is not
according model ?
Yes
Enter service mode and check /
correct adjustment.
No
Appliance in Overload P1 / P2 too high
Page 61 from 63
Correct adjustments of ΔP for
P1 / P2 adjusting L1/L2/A1/A2
proportionally
F7
Ionization detected with appliance in standby
Characteristic: Ionization system
Lock Out Error
Loose or bad connection
between cable and
electrode
Burner shutdown
Assure black wire is
securely connected to
the set of electrode
Ionization cable
damaged / defective
isolation ?
Yes
Replace wiring and
assure connection in
electrode
No
Ionization electrode
damaged?
Yes
Replace electrode
No
F9
Safety solenoid valve disconnected (only SW version > 0106)
Characteristic: electro valve
Lock Out Error
Loose connection in
safety solenoid (SV1 /
SV2 / SV3)
Burner shutdown
Verify wires connection:
SV1 – blue wires
SV2 – white wires
SV3 – black wires
Replace gas valve
Page 62 from 63
Measure resistance of
SV ≈ 99.7 Ω
No
Problem solved?
FA
Gas leakage error due to failure in gas valve that is not closing properly
Characteristic: Gas Valve + Ionization system
Lock Out Error
Gas leakage caused by
internal defect
Burner shutdown
At end of a demand,
ionization is detected at
burner
Yes
Replace gas valve
No
Gas leakage caused by
wrong signal
Problem solved?
Measure feed signal to
SV valves (≈20 – 24 V dc)
Signal is continuous
even without demand?
Yes
Bosch, Termotecnologia S.A
TT-DW/PRM-STI – International Training and Technical Support
Aveiro Plant - Portugal
Page 63 from 63

INSTANTANEOUS GAS WATER HEATER GWI-N

Transcription

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