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Bosch GWI-N Series Training And Service Information

Fan pressurized instantaneous gas water heater for indoor and outdoor installation
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INSTANTANEOUS GAS WATER HEATER
GWI-N
FAN PRESSURIZED GAS WATER HEATER FOR
INDOOR AND OUTDOOR INSTALLATION
12 / 16 / 20
16 / 20 / 26
12
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 76
6 720 814 719 SM FP_Australia 2017/04 EN

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  • Page 1 INSTANTANEOUS GAS WATER HEATER GWI-N FAN PRESSURIZED GAS WATER HEATER FOR INDOOR AND OUTDOOR INSTALLATION 12 / 16 / 20 16 / 20 / 26 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 2: Table Of Contents

    Contents INTRODUCTION ................... 3 APPLIANCE DESCRIPTION ................. 3 ...................... 3 PPLIANCE ESIGNATION ..................... 4 VAILABLE ACCESSORIES INSTALLATION ..................... 6 ..................6 PPLIANCE FIXATION ON THE WALL ......................7 ATER CONNECTIONS ......................... 7 AS CONNECTION ....................7 PPLIANCE PERFORMANCE COMPONENTS OVERVIEW ................. 8 ........................

  • Page 3: Introduction

    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.

  • Page 4: Available Accessories

    GWH – Instantaneous gas water heater GWH 16 / 20 / 26 – Output (flow rate at 25ºC rise) GWH 16 / 20 / 26 CT – Thermostatic control (variable power through electronic control) GWH 16 / 20 / 26 CT E – Electronic ignition (source is electricity) GWH 16 / 20 / 26 CT E 23/31 –...
  • Page 5 Pict. 2 – Remote control connection to the appliance (bottom layout in outdoor 16/20/26 range) Pict. 3 – Remote Control with cable, connectors and instruction manual Anti-Freeze Allows the protection of the appliance against water freezing inside of its pipes until -20ºC (lower environment temperature acceptable by gas valve), so to be used in cases where ambient temperature can be lower than 5ºC.

  • Page 6: Installation

    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: 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?

  • Page 7: Water Connections

    Water connections Requisite Observations Confirmation 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 - Nominal pressure: 300 - 700 kPa according to the appliance - Minimum pressure: 100 kPa...

  • Page 8: Components Overview

    Pict. 8 – Use of water flow meter and thermometer 4. Components Overview 1 – Collector 8 – Water valve 2 – RSF box 9 – Ionization electrode 3 – Heat exchanger 10 – Ignition electrode 4 – Heat cell 11 –...

  • Page 9: Control Panel

    1 –Collector 7 – Flow switch 2 –Box 8 – Gas valve 3 – Heat exchanger 9 – Gas inlet 4 – Burner 10 – Water inlet 5 – Fan 11 – Water outlet 6 – Electronics Pict.10 – Internal view of high output outdoor models (16 / 20 / 26) Control panel The control panel allows the user, installer or technician, to perform all different operations needed.
  • Page 10 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...
  • Page 11 Flame indication: Symbol displayed when ionization is detected - flame presence Indication of flame in the burner Warning symbol: Combined with an error indication / warning code indicates a faulty performance Tap symbol: In case symbol is displayed, decrease (-) or increase (+) flow Indication of not enough power to accordingly reach set point...

  • Page 12: Heat Cell With Burner Pipes

    WRAF0106 Pict 13 – Remote control view and software version sticker location 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 Pict.14 –...

  • Page 13: Gas Manifold

    GWH 26 GWH 16 / 20 GWH 12 Pict. 15 – Primary air plate examples Gas manifold The gas manifold is a gas distribution pipe with integrated drilled injectors and two pressure measuring points: gas valve pressure = P burner air fan pressure = P 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.
  • Page 14 Burner segment 2 Injectors Burner segment 1 Pict.17 – Gas manifold for 16l/min appliance with 15 injectors The gas manifold for GWH 20 models have in total 15 injectors with following distribution: NG Ø 1.7 in burner segment 1 + Ø 2.0 in burner segment 2 LPG Ø...

  • Page 15: Fan

    Gas Pressure Measurement point Air Pressure burner Measurement point Pict.20 – Pressure measuring points 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.
  • Page 16 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.

  • Page 17: Heat Exchanger

    Burner Burner segment 1 segment 2 Pict.24 – Gas valve / burner scheme Heat Exchanger The copper heat exchanger has different size and number of fins according to the appliance model (12, 16 and 20l/min)and also different copper pipe connections if in high output range (16, 20, 26 l/min). This configuration ensures the sealed heat transfer from the flame heat to the water that flows through the copper pipes.

  • Page 18: Water Inlet Assy

    Water Inlet Assy The inlet water valve contains the water connection of 1/2” that integrates also the filter mesh or for high output models is ¾” and contains screw to access filter cartridge. Pict.26 – Inlet Water Valve for indoor / outdoor Water temperature sensors The outlet and inlet water temperature is measured by a 10kΩ...
  • Page 19 Pict.28 – Box air temperature sensor location in 4000S models Pict.29 – Box air temperature sensor location in optiflow model Page 19 from 76 6 720 814 719 SM FP_Australia 2017/04 EN...
  • Page 20 4.10 – PCB (printed circuit board) The software version is visible in the identification sticker of the control unit as spare part and always refer to updated versions. Pict.30 – Identification sticker location according PCB design The PCB are always compatible with existing cables / interface in the field, nevertheless and for 4000 S models was done a change in the connector type, so to ensure compatibility between new control unit with cables in the field, adaptors are be supplied from FD >= 718 (Feb 2017).
  • Page 21 Pict.31 – Overview of the PCB with adaptors for 4000S Description Control unit (indoor version) Control unit (outdoor version) Power supply cable Sensor cable Gas valve cable Water valve cable Picture 32 – Overview of control unit and cables for FP Australia Page 21 from 76 6 720 814 719 SM FP_Australia 2017/04 EN...
  • Page 22 Power supply Sensors Water valve Gas valve Picture 33 – Rear view of control unit from FP Australia and adapters use On the picture 34 is presented the example of an adapter connecting the old cable of the fan with new pcb. Picture 34 –...

  • Page 23: Water Flow Sensor

    On the Picture 35 is presented the old terminal that is being replaced and the new one in the electrical cable supply, so this cable will now always be supplied with new PCB. Picture 35 – Old male terminal (left) and new male terminal (right) 4.11 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.

  • Page 24: Ignition Electrode

    In order to improve the temperature stabilization at the outlet and avoid temperature overshoot, a bypass with controlled valve is included in high output range (16 / 20 / 26 l/min) In case the difference between the detected outlet temperature and the set temperature is higher than 3ºC, the controlled water valve will open the cold water passage to the outlet, according to the corresponding inlet water flow (quantity could vary according overshoot peak –...

  • Page 25: Ionization Electrode

    Ignition spark Ignition Sequence Safety Time = 29 sec Attempt Purge Period Attempt Purge Period Attempt Pos Purge (5 sec) (3 sec) (5 sec) (3 sec) (5 sec) (8 sec) Ignition Sequence Safety Time of 29 sec Attempt Purge Period Attempt Purge Period Attempt...

  • Page 26: Working Principle / Electric Measurements

    Pict.40 – Ignition / ionization electrodes position on the burner Pict.41 – Burner detail with electrodes and top view 5. Working Principle / Electric Measurements Water Flow Detection and solar mode operation Solar mode Operation Water Flow Calculation procedure Burner On Burner Off WF = Power –...
  • Page 27 Connection to Operation Action Result the control unit Main Switch in control unit Input Electrical plug connected Input 240 V Standby Thermal fuse with continuity Input (Inputs Signals must be Contact closed within expected limits) Ionization reading Input 0 µA Ohm Value inside Temperature sensors OK Input...
  • Page 28 1 – Ionization electrode 9 – Solenoid Valve (SV3 – Burner) 2 – Fan 10 – Solenoid Valve (SV2 – Burner) 3 – Ignition electrode 11 – Thermal fuse 4 – Electrical supply 12 – Water flow sensor 5 – Anti-Freeze Connection 13 –...
  • Page 29 [1] Flame sensor rod [10] Segmentation electrovalve 2 (gas) [2] Fan [11] Safety electrovalve (gas) [3] Ignition electrode [12] Thermal fuse [4] Power supply [13] Water flow sensor [5] Connection for frost-protection device [14] Air temperature sensor [6] Connection for remote control (optional) [15] Hot water temperature sensor [7] By-pass valve [16] Cold water temperature sensor...
  • Page 30 Component Measuring Wire Value Remarks Description Colours Red-Black GND Control power On: ≥ 1.9l/min Water flow sensor Off: ≤ 2.2/min ≈ 2.4 V Yellow-Black GND (pulse frequency ~Hz) Note: see table 11 to check correspondence between water flow vs frequency signal Multimeter for resistance measurement R (Ω) Circuit open –...
  • Page 31 220.0 174.0 138.5 110.9 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 15 – NTC resistance values for Air Box NTC Operating R min R nominal R max (KΩ) Temperature (ºC) (KΩ) (KΩ) 30.34 30.40 36.47...
  • Page 32 Operating R min R nominal R max (KΩ) Temperature (ºC) (KΩ) (KΩ) 22.69 23.73 24.80 18.29 19.09 19.90 15.45 14.84 16.08 12.11 12.58 13.07 9.94 10.31 10.68 8.20 8.49 8.78 6.81 7.03 7.26 5.68 5.86 6.03 4.90 4.76 5.04 4.12 4.01 4.23 3.39...

  • Page 33: Service

    ~ 20.4 – 24 V (open) Main solenoid valve Blue-Blue 0 – 3.6 V (close) Inlet Safety Valve (SV1) Resistance ~ 99.7 Ω ~ 20.4 – 24 V Solenoid valve (SV3) Black-Black 0 – 3.6 V (close) Burner Segment 2 Resistance ~ 100.3 Ω...
  • Page 34 * Not Applicable for Pict.45 – Confirmation of HMI configuration (gas type) (Australia settings highlighted) AU models Page 34 from 76 6 720 814 719 SM FP_Australia 2017/04 EN...
  • Page 35 Pict.46 – Confirmation of HMI configuration (appliance type) 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.
  • Page 36 Gas valve adjustment See Combustion - gas power Maximum Power adjustments section for more details Set point Normal Mode Minimum Power Remote Control Registration See table with Diagnostic mode parameters Ignition Startup delay Temperature Unit Selection Gas Type Selection Back light activation Fan Purge Calibration of components...
  • Page 37 Reset to factory default values Set Point Limit … Set Point Calibration Altitude Adjustment Setpoint Normal Mode Minimum Power Purge selection … Appliance Power Diagnostic mode Exit … Set point Inlet Temperature Outlet Temperature Water Flow Box air temperature 1F – 10F Last recent failures Show All Segments Table 20 –...
  • Page 38 Combustion – 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...
  • Page 39 Technician Level Comments Range of value in control unit is from 0 The value measured when in to 40 P0 should be 1.2 mbar Spare part default setting is 20 Table 21 – P0 The P1 mode can be accessed in the service mode, depending on the adjustment and/or confirmation need.
  • Page 40 Range from 0 to 40 Adjustment of air flow without change gas conditions Spare part default setting is 20 Range from 0 to 40 Adjustment of gas flow without change air conditions Spare part default setting is 20 Table 23 – P1 sub menus Values in P1 mode are settled according to the appliance selection and gas type from factory.
  • Page 41 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 (P – P – P burner Minimum Power Technician Level Comments...
  • Page 42 The P3 is not used as the Wired Remote Control is automatically recognized by unit. When activating the connectivity in Retail models, use following procedure: The Bluetooth accessory is connected in retail model to one of the communication ports in the cable harness (1 out of 4) and only available for Optiflow 16 / 20 / 26 models as feature.
  • Page 43 Step 1 Test App performance in front of the unit Not working? Check ID label in bottom of the unit and check software version of Bluetooth device BLAF > 0103 – ok BLAF 0102 – not ok Open front cover and identify if Bluetooth dongle Replace Bluetooth device is connected...
  • Page 44 Step 4 If the problem persists disconnect the appliance, wait at least 30 seconds, connect it again and retry the connection; Restart as well the smartphone and open again the app and repeat the procedure for pairing unit with smartphone; Attention: Important Information for Technicians when replacing Control Unit: The function of data backup must be used without disconnecting the app and following...
  • Page 45 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 Comment Value / Unit...
  • Page 46 Visualization of all segments of text Test Display display (LCD) Allows the individual reset of P1 and P2 for the default values memorized from factory during appliance Reset to Factory default values adjustment. Enter this mode and select P1 or P2 according need and press P for reset (+/- 3 sec) Allows the Installer to select the...
  • Page 47 Parameter for control unit adaptation according appliance model (modulation range) Appliance Power definition 12 = GWH 12 16 = GWH 16 20 = GWH 20 26 = GWH 26 Table 29 – Visualization mode parameters 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 or eventually to avoid false ignitions when tap is activated for short uses of water.
  • Page 48 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.
  • Page 49 Components Calibration Technician Task Comments Allows the technician to calibrate Only applicable when components operation range after a components are replaced replacement Entry / Exit parameter Not Applicable in GWH 12 / 16 / 20 Only Applicable to Outdoor GWH 16 / 20 / Bypass calibration Open tap adjusting flow from 6 to 8 l/min (display show 60 to 80) and stop when...

  • Page 50: Maintenance

    Last 10 stop conditions for 1H – this is last stop occurred 2H – stop occurred before 1H diagnostic purposes 3H – stop occurred before 2H 4H – stop occurred before 3H Selecting the parameter will be 5H – stop occurred before 4H until possible to see as sequence 2 + 2 6H –...
  • Page 51 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 52 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.
  • Page 53 Pict.54 – using supplied sealing’s in burner / collector replacement Pict.55 – using supplied sealing’s in heat exchanger replacement When opening heat cell for cleaning / washing refers to gasket kit if components are not being replaced as example below for 12 / 16 / 20 models (1 kit per capacity) Page 53 from 76 6 720 814 719 SM FP_Australia 2017/04 EN...

  • Page 54: Trouble Shooting

    Pict.56 – using gasket kit when opening heat cell for cleaning / washing 8. Trouble Shooting Error Description Type Code Both Inlet and outlet NTC temperature sensors are Lockout damaged (open / short circuit) (manual reset) High temperature detected by NTC inside the box (T Warning >...
  • Page 55 Software Version AF1112 Lockout / shutdown of burner (self reset by closing water) Insufficient air flow at start up Software Version AF1113 Lockout / shutdown of burner (manual reset required) Warning (only if bypass valve is activated) Bypass valve damaged or disconnected. Note: error only existing in outdoor GWH16/20/26 Fan unplugged / no detection of rotation/speed signal...
  • Page 56 8.1) Problems without error codes Combustion noise too high Gas supply type according Convert appliance according IM appliance gas type ? (check existence of EF codes in memory) In case of need Assure gas supply pressure, Gas supply pressure (static / contact gas supplier testing appliance at dynamic) according IM ?
  • Page 57 Strong Ignition Noise Noise produced during start Intermittent spark Check contact between up upon a demand. generation? connector of ignition wires and electrode. Replace it in case of need and inspect electrode Noisy Solenoids Normal noise (component characteristic) activation? Re-check minimum Front Cover deflection? power adjustment.
  • Page 58 8.2) Problems with Error Codes 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 Ensure NTC wire is ATTENTION: sensor is interrupted Red wires –...
  • Page 59 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 Check position of sensor (attached box is high at back cover of control unit) Correct position and fix...
  • Page 60 Fault in the air flow NTC sensor Component Characteristic: NTC temperature sensor (220 kΩ) Lock Out Error Burner shutdown The Air NTC sensor is Assure NTC cable harness is connected interrupted or in short in control unit circuit Unplug the NTC connection and measure Refer to table with the NTC electrical resistance [R] (Ω) values in Service...
  • Page 61 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 Ensure NTC wire is ATTENTION: sensor is interrupted attached in NTC sensor Red wires – outlet NTC or in short circuit Unplug Wires and measure Refer to table with...
  • Page 62 Failure in outlet NTC in copper heat exchanger (only outdoor GWH 16 /20 /26) Characterístic: NTC Temperature sensor NTC in short circuito r Ensure that cables of NTC ATENCIÓN: are connected to pcb contact open Red Cables – NTC in heat exchanger outlet.
  • Page 63 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 Unplug the NTC connection wire sensor is not in both inlet / outlet sensors...
  • Page 64 Combustion failure detected Characteristic: Primary Fan (DC Centrifugal Fan) Lock Out Error Burner shutdown / self reset when closing water FD >= 620 (Feb 2016) - appliances with software version > FPAF1113 Lock Out Error Burner shutdown / manual reset Air Flow Estimation High Resistance in flue Procedure...
  • Page 65 Insufficient air flow at start up Characteristic: Primary Fan (DC Centrifugal Fan) Lock Out Error Burner shutdown / self reset by closing water FD >= 620 (Feb 2016) - appliances with software version > FPAF1113 Lock Out Error Burner shutdown / manual reset Air Flow Estimation High Resistance in flue Procedure...
  • Page 66 Bypass valve damaged or disconnected (only outdoor GWH 16 /20 /26) Characterístic: Solenoid valve (proportional valve normally closed and controlled with 0 – 24 V dc) Ensure that cables are Note: error only displayed if valve was Solenoid valve is requested to activate due to temperature connected connected?
  • Page 67 Brown – Blue: 0 – 45 V dc No signal from control unit to Orange – Blue: 10.8 – 13.2 V dc fan? Yellow – Blue: pulse frequency Defective Fan Defective Control Unit Replace Fan Replace Control Unit Excessive water flow (over specified value > 25 l/min) Characteristic: Water flow sensor (turbine) Warning Message Appliance keeps operation and code is flashing...
  • Page 68 Software / hardware failure in control unit Characteristic: Control Unit Lock Out Error Permanent error code? Replace control unit Defective control unit Wrong connections in cables? Correct Connections Error code after interface Turn Off and On Unit. Problem persist? manipulation? Over temperature detected by the NTC sensor in the hot water pipe (T out >...
  • Page 69 [R] Ω = Current Temp. Replace Sensor (ºC) ? Problem solved? Maximum inlet appliance is 60ºC – Appliance installed as ensure existence of thermostatic a solar backup unit? mixing valve before unit Error code self reset when temperature Maximum power very high decrease and appears repetitively? Failure in the inlet water temperature sensor...
  • Page 70 Problem solved? Change wiring See spare part list Problem solved? Replace control unit Air box NTC sensor detect high temperature inside room sealed box (T > 80ºC) Characteristic: NTC Temperature sensor Lock Out Error Burner shutdown but self reset by closing water Temperature inside Check position of sensor (attached box reach high limit...
  • Page 71 Evidences of leakages through sealing’s or HE overheat? Correct problem by Heat Cell includes heat inspecting and/or Problem solved? exchanger sealing with replacing gaskets / burner / flue collector sealings in Heat Cell Excessive burner Check CO2 power emissions and reduce power in L1 / A1 to correct ΔP1 Failure in the thermal fuse that opens circuit (Temp = 114 ºC)
  • Page 72 Lock Out Error Burner shutdown after safety time elapsed (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 –...
  • Page 73 Flame presence not Spark is ok and flame is visible, but appliance shut off detected and tries to re-ignite? Ionization sensor Verify the correct assembly of touching burner / metal electrode part? Ionization cable is Verify and assure cable is disconnected / connected and in contact with damaged?
  • Page 74 Modulating solenoid (MV1) disconnected Characteristic: electro-valve Lock Out Error Burner shutdown and manual reset needed after repair No current for Check cables connection to modulation solenoid MV1 (red cables) Problem solved? Minimum Power too low Adjust P2 (increase L2 value (ΔP of P2) and A2 proportionally).
  • Page 75 Ionization detected with appliance in standby Characteristic: Ionization system Lock Out Error Burner shutdown Loose or bad connection Assure black wire is between cable and securely connected to electrode the set of electrode Ionization cable Replace wiring and damaged / defective assure connection in isolation ? electrode...
  • Page 76 Measure feed signal to Signal is continuous SV valves (≈20 – 24 V dc) even without demand? Bosch, Termotecnologia S.A TT-DW/PRM-STI – International Training and Technical Support Aveiro Plant - Portugal Page 76 from 76 6 720 814 719 SM FP_Australia 2017/04 EN...

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