Table of Contents
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Installation and Service Instructions for Contractors
Residential Gas Condensing Boiler
Greenstar
ZBR 21-3 A... | ZBR 28-3 A... | ZBR 35-3 A... | ZBR 42-3 A... | ZWB 28-3 A... | ZWB 35-3 A... |
ZWB 42-3 A...
WARNING:
Improper installation, set-up, modification, operation or maintenance
of the heating system can cause personal injury and property damage.
Follow these instructions precisely.
If you require assistance or further information, contact a trained and
certified installer or the gas supply company.
WARNING:
The operating instructions are part of the technical documents that
must be handed over to the owner or operator of the heating system.
Explain to the owner or operator how to use the heating system using
the operating instructions. Make sure that they are familiar with all
required information for the safe and proper operation of the heating
system.
These instructions are available in English and French.
Please keep these instructions for future reference.
0010004900-002
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Table of Contents
Related Manuals for Bosch Greenstar Series
Summary of Contents for Bosch Greenstar Series
- Page 1 Installation and Service Instructions for Contractors Residential Gas Condensing Boiler Greenstar ZBR 21-3 A... | ZBR 28-3 A... | ZBR 35-3 A... | ZBR 42-3 A... | ZWB 28-3 A... | ZWB 35-3 A... | ZWB 42-3 A... WARNING: Improper installation, set-up, modification, operation or maintenance of the heating system can cause personal injury and property damage.
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Page 2: Table Of Contents
Technical data ZWB...-3A ......21 Programming the Bosch Room Controller ... 52 3.13... -
Page 3: Contents
Contents ZBR...-3A appliances (heating boiler) with DHW tank: 17 Faults ..........73 Thermal disinfection. -
Page 4: Explanation Of Symbols And Safety Instructions
Explanation of symbols and safety instructions Explanation of symbols and safety instructions Explanation of symbols General safety instructions Warnings If you hear gas leaking! In warnings, signal words at the beginning of a warning are used to ▶ Leave the building immediately. indicate the type and seriousness of the ensuing risk if measures for ▶... - Page 5 Explanation of symbols and safety instructions DANGER: Risk of personal injury or death from flue gas poisoning! NOTICE: ▶ Do not install a thermostatic flue gas damper downstream of the draft ▶ Upon completion of the installation, these instructions should be hood.
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Page 6: Scope Of Delivery
Flue adapter DHW tank temperature sensor (NTC) Hydraulics connection plate with mounting kit [10] External supply temperature sensor (NTC) [11] Bosch Room Controller with an integrated temperature sensor and set of documents 0010016622-002 Fig. 1 Scope of delivery heating boiler ZBR...-3A 1) Concentric vent kit available as accessory. -
Page 7: Zwb
Contents of package 2: Rail with connection box Flue adapter Hydraulics connection plate with mounting kit External supply temperature sensor (NTC) [10] Bosch Room Controller with an integrated temperature sensor and set of documents 0010016623-002 Fig. 2 Scope of delivery combi boiler ZWB...-3A 1) Concentric vent kit available as accessory. -
Page 8: Product Description
(ZBR...-3A only) • Flue gas temperature limiter • DHW priority (ZWB...-3A only) • Motorized 3-way valve (ZWB...-3A only) • Hydraulics connection plate Accessories Refer to the Bosch Product Catalog for a complete overview of all available accessories. Greenstar – 6721822579 (2021/01) -
Page 9: Product Dimensions And Minimum Clearances
Product Description Product dimensions and minimum clearances ≥ 4" * ≥ 4" * (102 mm) * (102 mm) * 17-21/64" (440 mm) 3-11/32" (85 mm) ≥ 4" ** (102 mm) ** 9-29/64" (240 mm) 13-57/64" (353 mm) " 7-7/8 (200 mm) 0010004928-001 Fig. -
Page 10: Appliance Layout Heating Boiler Zbr
Product Description Appliance layout heating boiler ZBR...-3A 0010016624-002 Fig. 5 Appliance layout ZBR...-3A Greenstar – 6721822579 (2021/01) - Page 11 Product Description Key to Fig. 5: Heatronic boiler control ON/OFF switch Burner flame indicator Service button Emissions test button Boiler high limit dial DHW thermostat Key pad lock ECO button [10] Reset button [11] Display [12] Condensate trap [13] Test ports for inlet gas pressure [14] Adjustment screw, minimum gas volume [15] Maximum gas adjuster [16] Flue gas temperature limiter...
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Page 12: Appliance Layout Zwb
Product Description Appliance layout ZWB...-3A 0010016625-002 Fig. 6 Appliance layout ZWB...-3A Greenstar – 6721822579 (2021/01) - Page 13 Product Description Key to Fig. 6: Heatronic boiler control ON/OFF switch Burner flame indicator Service button Emissions test button Boiler high limit dial DHW thermostat Key pad lock ECO button [10] Reset button [11] Display [12] Condensate trap [13] Test ports for inlet gas pressure [14] Adjustment screw, minimum gas volume [15] DHW temperature sensor [16] Plate-type heat exchanger...
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Page 14: Electrical Wiring Zbr
Product Description Electrical wiring ZBR...-3A LS NS 6 720 641 933-23.3O Fig. 7 Electrical wiring diagram ZBR...-3A Greenstar – 6721822579 (2021/01) - Page 15 Product Description Key to Fig. 7: Ignition transformer Boiler high limit dial 120 VAC connection DHW tank primary pump or 3-way valve External heating pump for unmixed heating circuit (secondary circuit) 5 or DHW recirculation pump Fuse T 6.3 A (120 VAC) DHW thermostat External safety high limit or low water cut off (LWCO) BUS connection, e.g.
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Page 16: Electrical Wiring Zwb
Product Description 3.10 Electrical wiring ZWB...-3A LS NS 6 720 641 933-24.3O Fig. 8 Electrical wiring diagram ZWB...-3A Greenstar – 6721822579 (2021/01) - Page 17 Product Description Key to Fig. 8: Ignition transformer Boiler high limit dial 120 VAC connection External heating pump for unmixed heating circuit (secondary circuit) 4 or DHW recirculation pump Fuse T 6.3 A (120 VAC) DHW thermostat External safety high limit or low water cut off (LWCO) BUS connection, e.g.
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Page 18: Technical Data Zbr
Product Description 3.11 Technical data ZBR...-3A ZBR 21-3 A... Input/Output Unit LPG (propane) Max. input rate 180/79 °F (82/26 °C) BTU/hr (kW) 79,200 (23.2) 77,500 (22.7) Max. output rate 104/86 °F (40/30 °C) BTU/hr (kW) 74,700 (21.9) 74,700 (21.9) Max. output rate 122/86 °F (50/30 °C) BTU/hr (kW) 74,000 (21.7) 74,000 (21.7) - Page 19 Product Description ZBR 28-3 A... ZBR 35-3 A... Input/Output Unit LPG (propane) LPG (propane) Max. input rate 180/79 °F (82/26 °C) BTU/hr (kW) 100,800 (29.5) 98,600 (28.9) 131,900 (38.6) 129,100 (37.8) Max. output rate 104/86 °F (40/30 °C) BTU/hr (kW) 93,800 (27.5) 93,800 (27.5) 122,800 (36.0)
- Page 20 Product Description ZBR 42-3 A... Input/Output at elevation 0 - 2000 feet (0 - 610 m) Unit LPG (propane) Max. input rate 180/79 °F (82/26 °C) BTU/hr (kW) 151,600 (44.4) 148,300 (43.5) Max. output rate 104/86 °F (40/30 °C) BTU/hr (kW) 137,500 (40.3) 137,500 (40.3) Max.
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Page 21: Technical Data Zwb
Product Description 3.12 Technical data ZWB...-3A ZWB 28-3 A... ZWB 35-3 A... Input/Output Unit LPG (propane) LPG (propane) Max. input rate 180/79 °F (82/26 °C) BTU/hr (kW) 100,800 (29.5) 98,600 (28.9) 131,900 (38.6) 129,100 (37.8) Max. output rate 104/86 °F (40/30 °C) BTU/hr (kW) 93,800 (27.5) 93,800 (27.5) - Page 22 Product Description ZWB 42-3 A... Input/Output at elevation 0 - 2000 feet (0 - 610 m) Unit LPG (propane) Max. input rate 180/79 °F (82/26 °C) BTU/hr (kW) 151,600 (44.4) 148,300 (43.5) Max. output rate 104/86 °F (40/30 °C) BTU/hr (kW) 137,500 (40.3) 137,500 (40.3) Max.
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Page 23: Condensate Composition
Regulations ZWB 42-3 A... Input/Output at elevation 0 - 2000 feet (0 - 610 m) Unit LPG (propane) Sound pressure level dB(A) ≤ 45 ≤ 45 Max. supply temperature °F ( °C) 187 (86) 187 (86) Max. permissible operating pressure (P ) heating psi (bar) 30 (2.07) -
Page 24: Additional Regulations For Installations In The Commonwealth Of Massachusetts
Regulations Additional regulations for installations in the Commonwealth of Massachusetts (a) For all side wall side horizontally vented gas fueled equipment • Detailed instructions for the installation of the venting system or the installed in every dwelling, building or structure used in whole or in part venting system components;... -
Page 25: Examples Of Installations
Motorized valve heating zone 2 To heating zone 2 Bosch room temperature controller heating zone 2 (CRC100) For all accessories not included in the package please refer to the Bosch Motorized valve heating zone 1 Product Catalog. To heating zone 1... - Page 26 PCB in heating boiler ZBR...-3A White plug for mains power supply, 120 V AC, 60 Hz ( chapter 7.3.4, page 48) For all accessories not included in the package please refer to the Bosch 120 V AC, 60 Hz Product Catalog.
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Page 27: Multiple Zones Using Circulators
Fig. 11 Piping Pump heating zone 3 To heating zone 3 Bosch room temperature controller heating zone 3 (CRC100) For all accessories not included in the package please refer to the Bosch Pump heating zone 2 Product Catalog. To heating zone 2... - Page 28 PCB in heating boiler ZBR...-3A White plug for mains power supply, 120 V AC, 60 Hz ( chapter 7.3.4, page 48) For all accessories not included in the package please refer to the Bosch 120 V AC, 60 Hz Product Catalog.
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Page 29: Notes On Installation And Operation
Anti-freeze ▶ Empty out sediment traps. NOTICE ▶ Systems containing antifreeze not approved by Bosch, must be completely flushed to ensure no old fluid remains. Insufficient antifreeze can accelerate corrosion. ▶ Fill the system with fresh water and the proper amount of inhibitor. -
Page 30: Other Important Information
Notes on installation and operation The following anti-freeze fluids and concentrations have been approved: 6.1.2 Other important information • The installation of this boiler must comply with all national and local Chemical Name Concentration code and regulations. Nalco (Varidos) FSK 22 - 55 % •... -
Page 31: Comparing The Size Of The Integrated Expansion Vessel
Notes on installation and operation Comparing the size of the integrated expansion Selecting an external expansion vessel (ZBR...-3A) vessel ▶ Determine the size of the expansion vessel in compliance with local laws and regulations. The following diagrams allow verifying that the integrated expansion vessel has sufficient capacity for the intended application, or if an additional expansion vessel is needed (not for radiant floor heating). -
Page 32: Pre-Installing Pipes
Notes on installation and operation Pre-installing pipes ▶ Secure the hydraulics connection plate and the mounting bracket with the mounting kits supplied. ▶ Secure the installation template (supplied with the technical documentation) to the wall; observe the minimum side clearances of 4 inches (102 mm) (... -
Page 33: Mounting The Appliance
Notes on installation and operation Mounting the appliance 5 1/8" NOTICE (130 mm) Residue, metal shavings, and contaminants in the piping can damage the appliance. ▶ Flush the piping thoroughly and completely to remove all residue. ▶ Follow the instructions with respect to water quality ( Chapter 6.1.1, page 29). -
Page 34: Installing The Low Water Cut Off (Lwco)
• Hydrolevel Safgard 1100 Ø > Ø The device is available at most Bosch wholesalers. It requires an external 24VAC AC 20VA transformer provided on site. Ø When a different LWCO is used, it must be installed outside the wall- mounted gas condensing boiler. -
Page 35: Connecting Flue Gas Accessories
• Twin pipe PP 2" (50 mm )/ 3" (80 mm) (M&G Duravent PolyPro and Centrotherm InnoFlue) • Concentric PP 3" / 5" (80/125 mm) (Bosch) In case of using the twin pipe adaptor: The twin pipe adaptor is supplied with the boiler kit as standard and is certified as a part of the vent system. -
Page 36: Installation Of The Exhaust And Air Intake System
Notes on installation and operation ▶ Install the concentric vent adaptor with the screws enclosed. Observe the listed maximum lengths of vent system, which are boiler model dependent ( chapter 6.8.3). DANGER Improper venting of the Greenstar boiler can result in excessive levels of carbon monoxide which can result in severe personal injury or death. - Page 37 M&G Duravent Approved Polypropylene PolyPro and Centrotherm InnoFlue PP rigid venting 3"/5" (80/125 mm) ANSI Cat IV concentric (Bosch, Approved Polypropylene manufactured by M&G Duravent) PP-Flex 3" (80 mm) vent or air ANSI Cat IV BH Gas venting systems, pipe M&G Duravent...
- Page 38 Ø 3" (Ø 76 mm) twin pipe termination M&G Duravent PolyPro 3PPS-HTP Ø 3" (Ø 76 mm) single pipe termination M&G Duravent PolyPro 3PPS-HST Ø 3"/5" (Ø 80/125 mm) Bosch Greenstar Horizontal Bosch (manufactured by 7738003218 Telescopic Terminal Kit M&G Duravent) Table 16 Wall terminals...
- Page 39 Notes on installation and operation 6 720 641 933-17.1O Fig. 31 Vent and combustion air pipe position Forced Air Inlet Gravity Air Inlet Exhaust terminal 1 foot (305 mm) Clearance in accordance with local installation codes and the requirements 1 foot (305 mm) 3 feet (915 mm) in Canada for models ZBR 35-3 A and ZBR 42-3 A Clearance in accordance with local installation codes and the...
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Page 40: Examples Of Approved Horizontal And Vertical Venting Installation
Notes on installation and operation 6.8.2 Examples of approved horizontal and vertical venting installation ≥ 4" NOTICE (102 mm) ▶ Place pipe supports every 5 ft (1525 mm) of horizontal and vertical run, beginning with support near wall-mounted gas condensing boiler. - Page 41 Notes on installation and operation 6 720 641 933-09.2O Fig. 36 Vertical venting system (sealed combustion) 6 720 641 933-10.1O 6 720 641 933-07.1O Fig. 37 Vertical venting system (room air only) Fig. 38 Vertical venting system (sealed combustion) Key to Fig. 36, Fig. 37 and Fig. 38: Intake Exhaust Greater than 12 inches (305 mm)
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Page 42: Vent And Combustion Air Pipe Lengths
Notes on installation and operation 1/4" per foot (50 mm per meter) 6 720 641 933-78.1O Fig. 41 Horizontal venting system (telescopic concentric vent kit) 6.8.3 Vent and combustion air pipe lengths With Flex Pipe the maximum length is reduced by 50%. Flex Pipe according to the suppliers instructions for use in the vertical part of the installation only. -
Page 43: Testing Gas And Water Connections For Leaks
Notes on installation and operation Installations Fig. 35 Stainless steel wall termination Fitting Equivalent 2" PIPE Maximum straight vent pipe length allowed for Ø 2" pipe 45° elbow 0.91 Number of 90° elbows ZBR 21-3A ZBR 35-3A 90° elbow 1.82 used ZBR 28-3A... -
Page 44: Electrical Connection
Replacement fuses can be found on the back of the cover ( Fig. 43, 7.2.2 Connecting the BUS-system page 44). Connect only Bosch room controls to the internal BUS of this boiler. For further details see the technical documentation of the BUS system Controls and modules components (e. g. CRC200 and CZM100). -
Page 45: Connecting The Outdoor Temperature Sensor
▶ Secure the cable with the strain relief. BUS/ CRC200 6 720 811 153-05.1O Fig. 45 Schematic of electrical wiring of Bosch room control and boiler Terminal at the boiler reads BUS or BB, both indicating connection of the 2-wired Bosch BUS system. 6 720 641 933-73.1O 7.2.3... - Page 46 Electrical connection Connecting the supply temperature sensor (e.g. for low-loss header Connecting Third party room thermostats or zone controls or system supply pipe) A voltage free (dry contact) third party room thermostat or heat demand Do not exceed a sensor cable length of 33 feet (10 m). from a relay panel can be used to send an ON/OFF signal to the appliance.
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Page 47: Electrical Connections In The Junction Box (120 Vac)
Connecting an external heating zone pump or DHW recirculation pump The DHW recirculation pump is controlled by the Bosch Room Controller. Without accessories the appliance offers the connection of one heating zone pump, one circulator of an unmixed heating circuit, or one DHW recirculation pump. -
Page 48: Dhw Tank Loading Pump Or 3-Way Valve With Spring Return (Only Zbr
Electrical connection 7.3.3 DHW tank loading pump or 3-way valve with spring return 7.3.4 Connecting mains power supply (only ZBR...-3A) ▶ Route the power cable (AC 120 V, 60 Hz) from the emergency The pump used must have the following connection values: 120 VAC, shutoff switch to the boiler. -
Page 49: Connecting The Lwco Device
Electrical connection Connecting the LWCO device ▶ Connect the leads labeled SWITCH CONTACT (yellow) to the TB1 NOTICE temperature switch ( Fig. 49, page 45) on the Heatronic. System damage or malfunction! ▶ Ensure the air box remains air-tight when routing the LWCO cable to the outside. -
Page 50: Commissioning
Commissioning Commissioning eco reset 6 720 641 933-25.1O Fig. 62 Overview of the controls Emissions test button Service button Burner operation indicator lamp ON/OFF power switch Key pad lock ECO button Reset button Display Automatic air vent (ZWB...-3A combi boilers only) [10] Boiler water pressure gauge [11] DHW thermostat [12] Safety relief valve discharge hose... -
Page 51: Before Operating The Appliance
Commissioning Before operating the appliance Switch on heat Set the maximum supply temperature based on the structure's heat loss NOTICE on design day. Commissioning without being properly filled and purged will Boiler high Typical supply Sample application damage the appliance. limit dial temperatures ▶... -
Page 52: Programming The Bosch Room Controller
▶ Set the DHW temperature on the DHW thermostat The set DHW temperature flashes on the display for 30 seconds. Observe the operating instructions for the Bosch room controller included in the scope of delivery. There you can read: ▶ How to set the operating mode ▶... -
Page 53: Zwb
-or- The DHW on demand signal allows maximum gas and water savings. ▶ If you want to leave the appliance switched OFF: Mix Bosch-approved anti-freeze into the heating water ( Tab. 29, page) and drain the Setting manual summer mode DHW circuit. -
Page 54: Activating The Key Pad Lock
ZBR...-3A appliances (heating boiler) with DHW tank: Thermal disinfection 8.10 Activating the key pad lock Boiler circulator The key pad lock affects the boiler high limit dial, the DHW thermostat, and all buttons except the ON/OFF switch, emissions test button, and 10.1 Pump anti-seize protection reset button. -
Page 55: Heatronic Boiler Control Settings
Heatronic boiler control settings Heatronic boiler control settings 11.1 Guideline to service functions The Heatronic allows easy setting and testing of many appliance functions. For an overview of service functions, see Chapter 11.2 on page 56. reset 6 720 641 933-52.1O Fig. -
Page 56: Overview Of The Service Functions
Heatronic boiler control settings 11.2 Overview of the service functions 11.2.1 First service level (press and hold the service button 11.2.2 Second service level (at first service level, service button until it lights up) lights up, press ECO button and key pad lock button simultaneously until 8.A appears) Service function Service function... - Page 57 Heatronic boiler control settings Service function 1.b: Maximum DHW output Service function 2.A: Heating circuit pump lockout time (only heating boiler ZBR...-3A) The hot water output can be adjusted between the minimum and maximum DHW outputs to suit the heat transfer capacity of the DHW NOTICE tank coil.
- Page 58 Heatronic boiler control settings The following settings are available: Service function 3.b: Set anti-cycle time • 00: Thermal disinfection not enabled Only if the automatic anti-cycle time is disabled (service function 3.A) will this function be active. • 01: Thermal disinfection enabled Default setting is 00 (disabled).
- Page 59 This service function displays the appliance type detected. deactivated). Available displays are: • 01: DHW recirculation pump enabled - See Bosch room controller • 00: Central heating only instructions on how to set a recirculation pump program. • 01: Combi appliance •...
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Page 60: 11.3.2 Second Service Level
Heatronic boiler control settings Service function 6.A: Display the latest fault code Service function 7.E: Building drying function Use this service function to display the most recent fault code. This service function allows you to start and stop the building drying function. - Page 61 Default setting is 50. Service function 9.E: Turbine signal delay (only combi boiler ZWB...- Service function 8.C: GFA Gas burner control unit status Internal parameter. If you are on the line with Bosch Technical Support you may be asked for this number. NOTICE Service function 8.d: GFA Gas burner control unit fault...
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Page 62: Gas Adjustment
Gas adjustment Gas adjustment 12.2 Installation location higher than 2,000 feet DANGER (610 m) above sea level Personal injury and property damage Input and output rates are reduced at higher altitudes due to thin air with reduced oxygen levels. ▶ This conversion shall only be performed by a trained and certified installer in accordance with the manufacturer‘s instructions and all ZBR 42-3A... - Page 63 Gas adjustment ▶ Measure the CO or O level and the CO content of the flue gas ▶ Remove screw ( Fig. 79, [3]) from the gas valve adjustment screw ( Section 13). ( Fig. 79, [2]) and set CO or O value for minimum nominal output.
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Page 64: Dynamic Gas Pressure Test Port
Flue gas test 12.4 Dynamic gas pressure test port Flue gas test ▶ Switch the appliance OFF and close the gas shut-off valve. ▶ Loosen the screw in the test port for gas inlet pressure ( Fig. 52, 13.1 Emissions test button [1]) and connect a pressure gauge (... -
Page 65: Environmental Protection And Disposal
▶ Cleaning of the heat exchanger should not be necessary until five years after the initial commissioning. ▶ Only use a Bosch cleaning blade and Bosch cleaning brush. ▶ Only clean heat exchanger when visibly dirty. Greenstar – 6721822579 (2021/01) -
Page 66: Description Of Various Steps
Inspection and maintenance 15.1 Description of various steps ▶ Loosen/remove pipe connections. 15.1.1 Calling up the latest fault (service function 6.A) ▶ Select service function 6A (page 60). An overview of the faults can be found on page 74. 15.1.2 Fresh water filter (only combi boiler ZWB...-3A) ▶... -
Page 67: 15.1.4 Checking Electrodes
Inspection and maintenance 15.1.5 Burner servicing DANGER Fire danger! ▶ The burner may be operated only while installed in a wall-mounted gas condensing boiler. ▶ Remove burner lid (steps 1 - 4). 0010032724-001 Fig. 88 Removing the plate heat exchanger ▶... -
Page 68: 15.1.6 Heat Exchanger Block Inspection And Cleaning
If mechanical cleaning is required: To clean of the heat exchanger, use Bosch burner gaskets, cleaning brush kit and cleaning blade, all of which are available as spare parts. ▶ Remove the condensate trap (steps 1 and 2) and place a suitable container underneath. -
Page 69: 15.1.7 Cleaning Condensate Trap
Inspection and maintenance ▶ Rinse the heat exchanger with water from the top. 15.1.7 Cleaning condensate trap ▶ Remove condensate trap (steps 1 and 2) and check heat exchanger orifice for clear passage. 6 720 612 664-18.1R Fig. 96 Rinsing the heat exchanger ▶... -
Page 70: 15.1.9 Checking The Expansion Vessel
Inspection and maintenance 15.1.9 Checking the expansion vessel 15.1.11 Testing system water quality Annual inspection of the expansion vessel is required. ▶ Take a representative sample of the system water and analyze pH using a pH meter or pH test strips. ▶... -
Page 71: Maintenance And Inspection Checklist
Inspection and maintenance 15.2 Maintenance and inspection checklist ▶ Use this form to guide you through the service and maintenance procedure. Fill out each step according to the findings and work performed. Date Latest fault code from service function 6.A. Fresh water inlet filter (Combi boiler ZWB appliances only). -
Page 72: Readings On The Display
Readings on the display Readings on the display The 7-segment display shows the following: Status Description Value displayed Description Range code Number or letter, dot Servicefunction Acknowledge by pressing any button (except reset). followed by letter ( Tab. 26/ 27, page 56/ 56) Letter followed by Fault code... -
Page 73: Faults
Faults Faults 17.1 Troubleshooting ▶ Switch the appliance OFF and ON again. DANGER The appliance starts up again and the current supply temperature is displayed. Explosion! ▶ Close the gas cock prior to working on the gas train. ▶ Check for gas leaks after carrying out work on the gas train. An overview of the faults can be found on page 74. -
Page 74: Faults That Are Shown On The Display
Faults 17.2 Faults that are shown on the display Display Description Elimination DHW temperature sensor defective. ▶ Check temperature sensor and leads for interruptions or shorts, and replace if defective. ▶ Insert code plug correctly; replace if defective. Communication fault. ▶... - Page 75 Faults Display Description Elimination No flame detected. ▶ Check that ground lead is properly connected, replace if defective. ▶ Check that gas cock is open. ▶ Check inlet gas pressure; correct if needed. ▶ Check power supply. ▶ Check electrodes for visual damage; replace if defective. ▶...
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Page 76: Faults That Are Not Shown On The Display
Faults 17.3 Faults that are not shown on the display Appliance faults Elimination Combustion noise too loud; rumbling noises ▶ Insert code plug correctly; replace if defective. ▶ Check gas type. ▶ Check inlet gas pressure; adjust if defective. ▶ Check flue gas system; clean or repair if defective. ▶... -
Page 77: Check Sensor Values
Faults 17.4 Check sensor values 17.4.3 Supply temperature sensor, External supply temperature sensor, DHW tank temperature sensor, DHW temperature 17.4.1 Outdoor temperature sensor sensor Resistance [ ] Temperature °F ( °C ) Resistance [ ] Temperature °F ( °C) Testing tolerance ±... -
Page 78: Commissioning Log For The Appliance
Commissioning log for the appliance Commissioning log for the appliance Home owner/operator: Last name, first name Number, Street Telephone/fax ZIP code, town System installer: Order number: Appliance type: (Complete a separate log for every appliance!) Serial number: Date commissioned: Individual appliance | Cascade, Number of appliances: ..... - Page 79 Commissioning log for the appliance System hydraulics checked, notes: Modified service functions: Select the modified service functions and enter the values here. Heating control: Weather-compensated control Room temperature-dependent control Remote control × ..Qty, heating zone(s) coding: ...
- Page 80 50 Wentworth Avenue Londonderry, NH 03053 Tel. 603-552-1100 Fax 603-965-7581 www.bosch-climate.us U.S.A. Products manufactured by Bosch Thermotechnik GmbH Junkersstrasse 20-24 D-73249 Wernau www.bosch-thermotechnology.com Bosch Thermotechnology Corp. reserves the right to make changes without notice due to continuing engineering and technological advances.