Floor standing oil-fired condensing boiler using room sealed flue for fully pumped open vent or sealed central heating systems and domestic hot water cylinders (48 pages)
These instructions are available in English and French. Please keep these instructions for future reference. ▶ Do not touch any electrical switch, telephone, and Warranty information available at www.bosch-climate.us do not use outlets. Annual service is required ▶ Extinguish all open flames.
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Symbols and Safety Instructions DANGER: Risk of fire when soldering and brazing! DANGER: Safety devices! ▶ Take appropriate protective measures when soldering and brazing ▶ Never shut off safety valves! around combustible and flammable material. ▶ Hot water may escape from the safety valve at any time when the appliance is running.
Scope of delivery KWB - Residential combi boiler for space heating and Scope of delivery DHW generation KBR - Residential boiler for space heating and loading of indirect fired DHW tanks 0010025097-002 Fig. 2 Scope of delivery combi boiler KWB...3A 0010025098-002 Contents of package 1: Fig.
Here you will find a list of typical accessories for this appliance. Refer to The rating plate is located on the right-hand side of the appliance. the Bosch Product Catalog for a complete overview of all available accessories. • Weather compensation control FW200 •...
Information about the appliance Key to figure 6 Heating boiler KBR.. -3A: Pre-wired low voltage installer connection box Pressure Relief Valve (PRV) Condensate hose Flue connector for twin pipe adaptor Air/gas premix chamber Pre-wired high voltage installer connection box Additional supply temperature limiter Not used Manual air bleed [10]...
Information about the appliance Electrical wiring heating boiler KBR..-3A Fig. 8 Electrical wiring diagram for heating boiler KBR..-3A Greenstar FS/Combi FS – 6 720 810 590 (2020/04)
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Information about the appliance Key to figure 8 Heating boiler KBR..-3A: Top of control board Code plug System supply temperature sensor Diagnostic interface ON/OFF switch Fuse T 6.3 A (120 VAC) Ignition transformer Boiler high limit dial High voltage - Installer connection box External heating pump [10] DHW tank primary pump or 3 way valve...
Information about the appliance 3.10 Electrical wiring Combi boiler KWB..-3A Fig. 9 Electrical wiring diagram Combi boiler KWB..-3A Greenstar FS/Combi FS – 6 720 810 590 (2020/04)
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Information about the appliance Key to figure 9 Combi boiler KWB..-3A: Top of control board Code plug System supply temperature sensor Diagnostic interface ON/OFF switch Fuse T 6.3 A (120 VAC) Ignition transformer Boiler high limit dial High voltage - Installer connection box External heating pump [10] 120 VAC connection...
Regulations Operating limits of the boiler (b) EXEMPTIONS: The following equipment is exempt from 248 CRM 5.08(2)(a) 1 through 4: The heat exchanger has been designed and certified in accordance with the ASME Boiler and Pressure Vessel Code, Section IV. •...
Common applications of KBR boilers Common applications of KBR boilers Multiple zones using zone valves with DHW Fig. 10 Piping Supply to heating zone 2 5.1.1 Utilizing the LLH Motorized valve heating zone 2 ▶ Switch off and isolate the boiler Supply to heating zone 1 ▶...
Common applications of KBR boilers 5.1.2 Wiring - Multi zone with zone valves and LWCO When using CZM100 and CRC100 or CRC200 controls the factory installed jumper at terminal [2e] remains. The LWCO jumper on terminal [2g] is removed when using a LWCO. For LWCO function an external transformer is required CZM100 4 5 6...
Common applications of KBR boilers Multiple zones using circulators with DHW Fig. 13 Piping Supply to heating zone 2 5.2.1 To utilize the LLH Pump heating zone 2 ▶ Switch off and isolate the boiler Supply to heating zone 1 ▶...
Common applications of KBR boilers 5.2.2 Wiring When using CZM100 and CRC100 or CRC200 controls the factory installed jumper at terminal [2e] remains. The LWCO jumper on terminal [2g] is removed when using a LWCO. For LWCO function an external transformer is required CZM100 4 5 6 ≤...
▶ Empty out sediment traps. Typically all multi zone applications with any combination of emitters like ▶ Systems containing antifreeze not approved by Bosch, must be baseboard, panel radiator or radiant would require primary secondary completely flushed to ensure no old fluid remains.
Installation Anti-freeze ▶ Eliminate leaks in the system Continually topping up the system constantly adds oxygen to the NOTICE: heating water, causing corrosion damage. All system leaks must be repaired. Insufficient antifreeze can accelerate corrosion. ▶ Follow manufacturer's instructions on antifreeze concentration. Boiler sealer ▶...
Installation Comparing the size of the integrated expansion ▶ Determine size of the expansion vessel. vessel (KWB-3A boiler only) 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). The following standard conditions were used: •...
Installation Surface temperature This allows the appliance to continue satisfying the demands of the heating system when high system flow rates are expected. The max. surface temperature of this appliance is below 185 °F (85 °C). According to ANSI/Z223.1/NFPA43 (National fuel gas code) and CAN/ CGA B 149.1 (Natural Gas and Propane installation code), the appliance is approved for zero clearance to combustibles.
The following LWCO is approved with the boiler: • Hydrolevel Safgard 1100 Fig. 21 Remove the cover The device is available at most Bosch wholesalers. It requires an external 6.7.1 Positioning the appliance 24VAC minimum 20VA transformer provided on site.
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Installation ▶ Disconnect the boiler from power by shutting off the emergency 1. Push the adapter with the LWCO onto the pipe switch or disengaging the heating system circuit breaker. 2. Secure with the clip ▶ Drain the boiler. 1. Remove the safety clip from the dummy plug in the supply pipe. 2.
• Twin pipe PP 2” (50mm) / 3" (80mm) (M&G Duravent PolyPro and Centrotherm InnoFlue) • Concentric PP 3" / 5" (80/125 mm) (Bosch) Using the twin pipe adapter: The twin pipe adaptor is supplied with the boiler kit as standard and is certified as a part of the vent system.
Installation DANGER: Flue connections Incorrectly fitted flue connections can lead to carbon monoxide escaping into the boiler room. ▶ Ensure that the flue pipes and seals are not damaged. ▶ Use only sealing compounds (primer and glue) approved with the vent material.
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Installation Direct vent installations (sealed combustion) For direct vent applications all applicable items below must be met. The exhaust pipe must be properly supported and pitched a minimum of ¼” (6.35 mm) per foot back to the boiler. This allows the condensate to properly drain.
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Installation 6 720 641 933-17.1O Fig. 31 Vent and combustion air pipe position Direct vent (sealed combustion): horizontally - USA 6 feet (1830 mm) above forced air inlet - Canada Forced Air Inlet Gravity Air Inlet Fan assisted (non-sealed combustion): Exhaust terminal Forced Air Inlet 1 foot (305mm)
Installation 6.9.2 Approved examples of horizontal and vertical venting ≥ 4" installations (102 mm) NOTICE: ▶ Place pipe supports every 5 feet (1525 mm) of horizontal and vertical run, beginning with support near boiler. ▶ The condensate must be disposed of in accordance with applicable rules.
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Installation 6 720 810 590-23.1W Fig. 36 Vertical venting system (sealed combustion) 6 720 810 590-25.1Wo 6 720 810 590-24.1Wo 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 Concentric termination...
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Installation 6 720 806 922-08.2O Fig. 40 PolyPro Flex Chimney Cap (PP) vertical venting system (sealed 6 720 810 590-26.1Wo combustion) Intake Exhaust Fig. 39 Vertical venting system (sealed combustion) Intake Exhaust >12” (305mm) 12” (305mm) above maximum snow level or at least 24” (610mm) whichever is greater 5/8"...
Installation 6.9.3 Vent and combustion pipe lengths Installations Fig. 38, Concentric terminations 2” PIPE Maximum effective vent pipe length allowed for Ø 2” pipe With Flex pipe the maximum length is reduced by 50% Flex pipe KBR 16-3 KBR 35-3 according to the suppliers instructions for use in the vertical part of the KBR 21-3 KWB 35-3...
Connecting the BUS-System ▶ It is not sufficient to simply shut off the controls. Connect only Bosch room controls to the internal BUS of this boiler. For ▶ Observe all applicable electrical codes and regulations. further details see the technical documentation of the BUS system components (e.
Connecting an external heating zone pump or DHW recirculation pump Without accessories the appliance offers the connection of one heating The DHW recirculation pump is controlled by the Bosch FW 200. zone pump, one circulator of an unmixed heating circuit, or one DHW recirculation pump.
The low voltage installer junction box provides connections to sensors, thermostat and programmers. Bosch room controls Connect only Bosch room controls to the internal BUS of this boiler. For installation and electrical connection of Bosch controls, see installation instructions for the Bosch control.
Elecrical connection LWCO DHW Sen Out Sen 6720810590-57.1Wo (2014/11) Fig. 54 Low voltage (LV) terminals (pre-wire links not shown for simplicity) 6 720 641 933-67.1O BUS - BUS connection to programmer TT - Thermostat/On demand signal (pre-wired link) (dry contact) Fig.
Commissioning Commissioning Fig. 57 Overview of the controls Emissions test button ▶ Bleed all air from the system. Service button ▶ If the boiler water pressure has dropped, fill the heating system again Burner operation indicator lamp to 14.5 to 21.75 psi (1 to 1.5 bar). ON/OFF power switch ▶...
When the appliance is switched ON for the first time, it performs a once- only purging sequence. This involves the heating zone pump switching Refer to the operating instructions for the Bosch room controller on and off at intervals (for approx. 4 minutes).
Commissioning KBR..-3A appliances (heating boilers) with DHW KWB..-3A appliances (combi boilers): Setting the tank: Setting the DHW temperature DHW temperature ▶ Set the DHW temperature on the DHW thermostat *. ▶ Set the DHW temperature on the DHW thermostat *.The set DHW The set DHW temperature flashes on the display for 30 seconds.
▶ Advise occupants of the risk of scalding if no tempering valve is ▶ If you want to leave the appliance switched OFF: installed. ▶ Mix Bosch-approved anti-freeze into the heating water (Tab. 15) ▶ Set the time and DHW temperature accordingly on the heating and drain the DHW circuit.
Boiler circulator Boiler circulator 10.1 Pump anti-seize protection This function prevents the heating zone pump from seizing up following longer idle periods. The appliance will briefly run the pump at least every 24 hours after its last activation. 10.2 Changing the pump curve of the boiler pump The speed of the boiler pump can be changed using the dial on the pump.
Heatronic boiler control settings ▶ Press and hold the service button until it illuminates. The display Heatronic boiler control settings shows a code such as 1.A (first service level). Press the ECO button and key pad lock button simultaneously until the code 8.A appears 11.1 Guideline to service functions (second service level).
Heatronic boiler control settings 11.2.2 Second service level ▶ Record the set DHW output in the commissioning log (page 75). At first service level, service button lights up, press ECO button and key ▶ Exit the service functions. pad lock button simultaneously until 8.A appears) ▶...
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Heatronic boiler control settings between 01 - 24 (10 - 240) seconds according to the manufacturer's • 02: The appliance runs for 15 minutes at maximum output. The documentation. display shows 2.F. When this service function is aborted or has been active for 15 minutes, the appliance reverts to default mode.
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Heatronic boiler control settings Service function 3.d: Minimum output (heating and DHW) • 01: Warning tone on The output for heating and DHW can be set to any level in percent Default setting is 01 (ON). between the minimum and maximum nominal output. Service function 4.E: Appliance type The default setting is the minimum nominal output (heating and DHW) This service function displays the appliance type detected.
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Heatronic boiler control settings • 02: External heating zone pump in heating circuit without 3-way valve Service function 7.b: 3-way valve in center position controlled by FW 200. After the value 01 has been saved, the 3-way valve moves to the center •...
Service function 8.C: GFA Gas burner control status can be set from 45 to 77 revolutions per second (1/s). Internal parameter. If you are on the line with Bosch Technical Support Default setting is 50 you may be asked for this number.
Gas type conversion Service function A.b: Display DHW temperature DANGER: This service function allows displaying the current DHW temperature. Explosion! Service function A.C: Display DHW tank temperature ▶ Close the gas cock prior to working on the gas train. This service function allows displaying the temperature of the DHW tank ▶...
Gas type conversion The Bosch Greenstar boiler is factory set for installation below 2000 feet (610 m) above sea level. 12.1 Installation location higher than 2,000 feet (610m) above sea level Input and output rates are reduced at higher altitudes due to thin air with reduced oxygen levels.
Gas type conversion ▶ Press and hold the emissions test button C until it lights up. The display shows the supply temperature alternating with maximum set output in heating mode. ▶ Briefly press the emissions test button C. The display shows the supply temperature in alternation with maximum nominal output.
Flue gas test Flue gas test Do not operate the appliance if the measured value is below or above 13.1 Emissions test button these values. Determine the cause and eliminate the fault. If this is not The following appliance outputs can be selected by pressing the possible, block the appliance on the gas side and notify the gas supplier.
▶ Select service function 6.A ( Page ). Environmental protection is one of the fundamental company policies of the Bosch Group. Quality of products, efficiency and environmental protection are equally An overview of the faults can be found on page 74.
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Inspection and maintenance ▶ Remove hose from safety relief valve. ▶ Remove the boiler pressure gauge from the Heatronic boiler control. 6720810590-41.1Wo Fig. 82 Unplugging electrical connections / removing hose from PRV ▶ Loosen/remove pipe connections. Fig. 84 Removing the boiler pressure gauge ▶...
Inspection and maintenance ▶ Remove the plate type heat exchanger. 15.1.5 Burner servicing DANGER: Fire Improper operation of the burner ▶ Only operate the burner while installed in a boiler ▶ Remove the burner cover (steps 1 - 4). 6 720 641 933-50.2O Fig.
▶ 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 in case if soiling is clearly visible.
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. 94 Rinsing the heat exchanger ▶...
Inspection and maintenance ▶ Insert the diaphragm into the fan connector. 15.1.12 Checking the electrical wiring ▶ Check electrical wiring for mechanical damage and replace defective cables. The diaphragm flaps must open upwards. ▶ Close the mixer unit. 15.1.9 Expansion vessel DANGER: Risk of electric shock! ▶...
Inspection and maintenance 15.2 Checklist for annual inspection and maintenance ▶ 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 ( Section 15.1.1). Fresh water inlet filter (Combi boiler KWB appliances only) (...
Display Status Description Display code 16.1 Readings on the display Acknowledge by pressing any button (except reset). The 7-segment display shows the following: Value displayed Description Range Number or letter, dot Service function ( Tab. 30/ 31 Acknowledge by pressing two buttons followed by letter page 56/ 57) simultaneously...
Faults ▶ Switch the appliance OFF and ON again. Faults The appliance starts up again and the current supply temperature is displayed. 17.1 Troubleshooting DANGER: An overview of the faults can be found on page 75. Explosion! An overview of the status codes can be found on page 73. ▶...
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. ▶...
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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. ▶...
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. ▶...
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:.....
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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: ...
Spare parts Spare parts ▶ Order spare parts by name and part number using the spare parts list. Designation Spare parts list Group 1 Sheet metal Section 19.1 ...
Spare parts 19.8 Group 8 - Accessories for service/installation - Greenstar Item Designation Order number – Brush set WB5 7 719 002 502 – Cleaning blade WB5 7 719 002 503 ...
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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.