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Installation Instructions

Singular Combi Boiler - BTC 439003301 B (2021/07)

4.6     Examples of System Applications

Refer to the following examples to properly implement a system for space heating, 
DHW supply, or both. These examples are provided to suggest basic guidelines 
when you install the boiler system. However, the actual installation may vary 
depending on the circumstances, local building codes, or state regulations. Check 
the local building codes and state regulations thoroughly before installation, and 
comply with them fully.

4.6.1     System Application – Zone System with Zone Valves

Figure 18

Zone Valve

Zone 1

Zone 2

Zone 3

System pump

Air Separator

Expansion tank

Not to exceed 4 pipe Dia or Max. 12 in

Purge Valve

Summary of Contents for Singular 4000

Page 1: ...re department WARNING Improper installation adjustment alteration service or maintenance can cause property damage personal injury exposure to hazardous materials or loss of life Refer to the user s information manual provided with this boiler Installation and service must be performed by a qualified installer service agency or the gas supplier who must read and follow the supplied instructions be...

Page 2: ...2 Installation Instructions Singular Combi Boiler BTC 439003301 B 2021 07 ...

Page 3: ...e 27 6 Installing a Vent 29 6 1 Vent Type 29 6 1 1 Direct Venting 29 6 1 2 Non Direct Venting 31 6 2 Vent Pipe Materials 33 6 3 Vent Length 34 6 4 Connecting the Vent Clip 34 6 5 Vent Termination 35 6 5 1 Single Pipe Sidewall Venting 35 6 5 2 Two Pipe Sidewall Venting 35 6 5 3 Snorkel Flue 36 6 5 4 Non Concentric Sidewall Venting 36 6 5 5 Concentric Sidewall Venting 36 6 5 6 Two Pipe Vertical Vent...

Page 4: ...tly closed and out of the reach of children The boiler has a main burner flame that can come on at any time and will ignite flammable vapors Vapors cannot be seen and are heavier than air They can travel long distances along the ground and can be carried from other rooms to the boiler s main burner flame by air current WARNING SCALDHAZARD Water temperature over 125 F can cause severe burns or deat...

Page 5: ...n to operate or have access to the boiler WARNING IMPROPERORDANGEROUSOPERATION Immediately call a qualified service technician to inspect the appliance and replace any part of the control system and or any gas control which has been immersed in water WARNING This product can expose you to chemicals including Lead and Lead components which are known to the State of California to cause cancer and bi...

Page 6: ...he responsibility of the property owner to secure the services of qualified licensed professionals for the installation of hard wired carbon monoxide detectors a In the event that the side wall horizontally vented gas fueled equipment is installed in a crawl space or an attic the hard wired carbon monoxide detector with alarm and battery back up may be installed on the next adjacent floor level b In...

Page 7: ...2 Optional Accessories The following optional accessory is not included with the boiler but may be necessary for the installation Check the need for the following optional accessory before installation Figure 2 Outdoor temperature sensor WARNING Installing the appliance and or any accessories for the appliance may only be carried out by a qualified service technician and must conform to the requir...

Page 8: ...wall hung Venting Type Forced draft direct vent Ignition Electronic ignition Water Pressure Hydronic DHW 12 30psi 15 150 psi Supply Pressure Natural Gas 3 5 10 5 WC Propane 8 13 WC Temperature Range Space Heating 82 F 180 F 27 C 82 C DHW 86 F 140 F 31 C 60 C Minimum Flow Rate DHW 0 5GPM 2 0LPM Power Supply Main Supply 120V AC 60 Hz uses less than 5 AMP Connection Sizes Space heating Supply Return ...

Page 9: ...l installation sur des sols incombustibles uniquement Water temperature limit limite de température de l eau M C No 271266 of This boiler must be installed in accordance with local codes if any if not follow the National Fuel Gas Code ANSI Z223 1 NFP A 54 or the Natural Gas and Propane Installation Code CAN CSA B149 1 as applicable Cette chaudière doit être installée conformément aux codes locaux ...

Page 10: ...mm 3 6 91 4 mm 2 7 68 6 mm 1 6 40 6 mm 6 1 154 9 mm 2 8 71 1 mm 3 4 86 4 mm 4 7 119 4 mm 2 2 55 9 mm 8 0 203 2 mm A B C D E F 1 8 45 7 mm 27 56 700 mm 31 87 809 5 mm Position Description Diameter A Space heating Return 1 NPT B Cold water inlet 3 4 NPT C Condensate Outlet 1 2 NPT D Hot water Outlet 3 4 NPT E Space heating Supply 1 NPT F Gas Inlet 3 4 NPT G Exhaust Vent 2 H Air inlet 2 Table 3 ...

Page 11: ...omponents Figure 5 Air intake connector Gas connector Gas valve 3 way valve Pressure sensor Space heating supply Gas inlet Hot water outlet Burner hood Heat Exchanger Cover Pump Air vent Condensate drain Space heating return Cold water inlet Exhaust temperature sensor Flue connector ...

Page 12: ...ingular Combi Boiler BTC 439003301 B 2021 07 Figure 6 Ignition transformer PCB assembly Front panel Secondary heat exchanger Primary heat exchanger Flow sensor Air Pressure Sensor TDR damper Water Pressure Sensor Turbo fan assembly ...

Page 13: ...installed in such a way as to ensure that the gas ignition system components are protected from water dripping spraying rain etc during operation and service 3 3 3 Drainage A significant amount of condensate is produced during the boiler operation Install the boiler near a suitable drain and where damage from a possible leak will be minimal Installing the boiler without a drain will void the warran...

Page 14: ...mulate or where combustion air can be contaminated Do not install the boiler in areas with greasy fumes or heavy amounts of steam if necessary take measures to prevent fumes and steam from entering the boiler Chemicals that are corrosive in nature should not be stored or used near the boiler 3 3 7 Position WARNING FIRE EXPLOSION PROPERTYDAMAGE Do not mount the boiler to dry wall that has not been ...

Page 15: ...bracket and hang the boiler from the bracket Figure 9 CAUTION BODILYINJURY PRODUCTDAMAGE The boiler is heavy Always lift the unit with assistance Be careful not to drop the boiler while lifting or handling it to avoid bodily injury or damage to the unit NOTICE PRODUCTDAMAGE Do not rest the bolier on the bottom end after removing it from the shipping carton Doing so may result in excessive pressure...

Page 16: ...s necessary to check if the amount of glycol use in the space heating water is appropriate and if the inhibitor level in such glycol is appropriate Bosch recommends against exceeding a 35 concentration of glycol If freeze protection products are used the system should be tested at least once a year When using the freeze protection products allowance should be made for expansion of the glycol solut...

Page 17: ...ng return Space heating supply 4 1 3 Space Heating Piping When connecting the space heating system follow these guidelines Tighten the connection valves carefully in order to avoid damage After installing the boiler check if the space heating water flows smoothly and if there is a water leak Inform the boiler owner of the fact that the strainer should be cleaned periodically to maintain the smooth...

Page 18: ...ystem in the boiler The maximum Btu h rating of the pressure relief valve should be greater than or equal to the maximum input Btu h rating of the boiler If the pressure relief valve operates discharging domestic hot water may scatter or splash onto other equipment around Connect the pressure relief valve to the DHW outlet pipe When installing the discharge piping line do not install a coupling wh...

Page 19: ...stances The boiler creates condensation when it operates This condensation has an acidic pH of 3 5 Follow all local codes and regulations when disposing of condensate from the boiler Disposal Dispose of condensate from the boiler through a neutralizing agent and then into an external drain using an air gap NOTICE If necessary a condensate pump can be used when there is an uphill pipe run and or a ...

Page 20: ...stem with water Therefore additional water fill connection is not necessary in most cases Filling the system with water should be carried out after all space heating pipes and DHW pipes are connected The procedure is as follows When you turn the makeup water feeding valve shown in the figure below counterclockwise the space heating system will be filed with water When filling with water after insta...

Page 21: ...tem piping concept only When installing a mixing valve on the DHW piping ensure that the cold water pressure does not exceed the hot water pressure For the upstream side of all circulator use straight pipes with a minimum diameter of 12mm Provide a system expansion tank following the guidelines on page 16 Installations must comply with all local codes IN Massachusetts a vacuum relief valve must be...

Page 22: ... guidelines when you install the boiler system However the actual installation may vary depending on the circumstances local building codes or state regulations Check the local building codes and state regulations thoroughly before installation and comply with them fully 4 6 1 System Application Zone System with Zone Valves Figure 18 ZoneValve Zone 1 Zone 2 Zone 3 System pump Air Separator Expansi...

Page 23: ... 23 Installation Instructions Singular Combi Boiler BTC 439003301 B 2021 07 4 6 2 System Application Single Zone System Figure 19 Zone 1 System pump optional Air Separator Expansion tank PurgeValve ...

Page 24: ...Singular Combi Boiler BTC 439003301 B 2021 07 4 6 3 System Application Zone System with Circulators Figure 20 CheckValve Zone 1 Zone 2 Zone 3 System pump Air Separator Expansion tank Not to exceed 4 pipe Dia or Max 12 in PurgeValve ...

Page 25: ...6 For less than 6 WC supply pressure Maximum Capacity of Natural Gas Based on a 0 60 specific gravity at a 3 0 WC pressure drop Pipe Size kBTU H of Natural Gas Length 10 20 30 40 50 60 70 80 90 100 125 150 200 1 2 454 312 250 214 190 172 158 147 138 131 116 105 90 3 4 949 652 524 448 397 360 331 308 289 273 242 219 188 1 1790 1230 986 844 748 678 624 580 544 514 456 413 353 1 1 4 3670 2520 2030 173...

Page 26: ...sure a sufficient gas supply it is recommended that the boiler be the first appliance to be connected to the gas supply line To connect the gas supply 1 Determine the gas type and pressure by referring to the rating plate 2 Perform a pressure test on the main gas supply line 3 Purge the gas line of any debris 4 Determine the proper type and size for the gas line Refer to the gas pipe sizing tables on...

Page 27: ...nction properly without sufficient inlet gas pressure The boiler must be isolated from the gas supply piping system during any pressure testing of that system at test pressures equal to or more than 0 5 psig If overpressure has occurred through improper testing of the gas lines or malfunction of the supply system the gas valve must be checked for safe operation The inlet gas pressure must be maint...

Page 28: ...valve and check for leaks 7 Open multiple fixtures that have high flow rates such as bathtub and shower faucets to ramp up the boiler to its maximum firing rate 8 When the boiler reaches its maximum firing rate check the inlet gas pressure reading on the manometer The gas pressure must fall within the ranges specified in Specifications on page 8 Figure 27 9 Tighten the inlet gas pressure screw 10 Replac...

Page 29: ...area where snow is known to accumulate protect the vent termination from blockage Ensure that the vent termination is at least 12 305mm above ground or as required by local codes Support the vent pipe with hangers at regular intervals or as required by local codes Exhaust and intake air pipes must be supported at least every 4 feet 1 2m The vent for this appliance shall not terminate over public w...

Page 30: ...et 36 in 91 cm J Clearance to non mechanical air supply inlet to building or the combustion air inlet to any other application 36 in 91 cm 12 in 30 cm K Clearance to mechanical air supply inlet 72 in 182 cm 36 in 91 cm above if within 10 feet horizontally L Clearance above paved sidewalk or paved driveway located on public property 84 in 213 cm M Clearance under veranda porch deck or balcony 12 in...

Page 31: ...g in the installation location use a direct venting system for the boiler When installed in a manufactured home mobile home all combustion air must be supplied from the outdoors as described on page 30 When using non direct venting maintain non direct vent clearances shown on page 32 as required by ANSI Z21 10 3 and the National Fuel Gas Code ANSI Z223 1 NFPA 54 and CAN CSA B149 1 Natural Gas and ...

Page 32: ... in 91 cm J Clearance to non mechanical air supply inlet to building or the combustion air inlet to any other application 36 in 91 cm 4 feet below or to side of opening 1 foot above opening K Clearance to mechanical air supply inlet 72 in 182 cm 36 in 91 cm above if within 10 feet horizontally L Clearance above paved sidewalk or paved driveway located on public property 84 in 213 cm 84 in 236 cm M...

Page 33: ... and must not be intermixed with another system manufacturer s parts The supplied vent connector and vent termination are certified as part of the boiler Generally the boiler limits the flue gas to remain below 150 F 65 C to use the flue pipe When the return water temperature to the boiler is higher than 140 F 60 C DIP switch 1 must be set to ON to release the flue gas limit CPVC or PP must be use...

Page 34: ...near feet 2 4 m of vent Each 45 elbow equates to 4 linear feet 1 2 m of vent 3 150 45 m 8 Reduce the maximum vent length accordingly for each elbow used Each 90 elbow equates to 5 linear feet 1 5 m of vent Each 45 elbow equates to 3 linear feet 0 9 m of vent Table 13 The maximum length does not include any elbows If using a concentric termination as shown on pages 36 count this as 8 linear feet 2 ...

Page 35: ...tion and situation The subsections that follow describe some typical venting configurations but do not include all possible options 6 5 1 Single Pipe Sidewall Venting Figure 36 3 Schedule 40 PVC Pipe 10 254 mm min 12 300 mm min CAUTION Single pipe venting requires that adequate combustion air be provided in end use installations per NFPA 54 C 9 3 2 6 5 2 Two Pipe Sidewall Venting Internal view Figu...

Page 36: ...intake air pipe and exhaust pipe Air is drawn from a different location at a minimum of 12 300mm from the exhaust termination Try to minimize the length of the intake air pipe with this venting 6 5 5 Concentric Sidewall Venting The following terminations can also be used Duravent PolyPro Horizontal Concentric Termination Kit 2 in x 4 in Concentric Vent Kit 2PPS HK 3 in x 5 in Concentric Vent Kit 3...

Page 37: ...ntake air 12 300 mm min WARNING Maintain 12 300 mm min 18 450 mm min for Canada clearance above highest anticipated snow level Maximum of 24 600 mm above roof NOTICE Install a bird screen at the end of the intake air pipe and exhaust pipe Intake and exhaust pipes do not have to terminate in the same area 6 5 7 Concentric Roof Venting Figure 44 Combustion air Maintain 12 300 mm min Combustion air V...

Page 38: ...mperature limit for exhaust gas OFF Temperature limit for exhaust gas EEP ROM data change switch ON Enable EEP ROM data change OFF Disable EEP ROM data change Long flue Length 1 DIP S W 3 DIP S W 4 FLUE LENGTH 2 PVC 3 PVC OFF OFF Up to 15 Up to 150 Long flue Length 2 OFF ON Up to 30 N A ON OFF Up to 45 ON ON Up to 60 N A N A Minimum heat capacity operation ON Minimum operation OFF Normal operation M...

Page 39: ...electrical line to the boiler If local codes require the boiler to be wired directly remove and discard the factory installed plug Install a power switch between the breaker and the boiler to facilitate end user maintenance and servicing Connect the boiler to a 110 120V AC at 60 Hz with a maximum of 5A rating electrical supply The boiler must be electrically grounded If using the power plug ensure...

Page 40: ...d on the boiler s rating plate Is the gas line at least 1 2 or 3 4 in ID Inner Diameter Is the gas supply line sufficient in length and diameter to deliver the required BTUs Have you measured the pressure of the gas supply line Is the gas supply pressure within the recommended ranges specified in this manual Is the gas supply line equipped with a manual shut off valve Have you tested the gas line pres...

Page 41: ...Polypropylene Type BH Special Gas Vent ULC S636 for Category IV boilers Canada or in accordance with all local codes and the guidelines in this manual Have you ensured that ABS or PVC cellular core pipe has not been used as venting for the boiler Is the vent sloped back towards the boiler at a rate of 1 4 in per foot 2 grade Are all vent runs properly supported Have you properly supported the vent...

Page 42: ...s off on the digital display Figure 47 4 If the lamp does not turn off contact the installer or supplier 10 3 Setting the Space Heating Temperature WARNING If your household includes children or elderly or disabled individuals consider using a lower temperature setting High temperatures circulating through baseboards or radiators can cause burns when touched To set the space heating water temperatur...

Page 43: ...rature appears on the display Figure 51 Temperaturerange Adjusting the water temperature 86 140 F Fahrenheit mode 31 60 C Celsius mode 2 F increments 1 C increments 31 45 C 46 48 50 C 130 F 140 F 55 C 60 C 10 F or 5 C increments Table 18 To change the temperature over 120 F hold down button for 5 seconds to unlock 10 5 Viewing Basic Information To turn the boiler on press the button Figure 52 To v...

Page 44: ...he most recent error H1 and the most recent error Example A2 will be displayed repeatedly on the screen Figure 55 10 5 3 H2 mode This is the mode for checking the current error H2 and the current error Example A3 will be displayed repeatedly on the screen Figure 56 10 5 4 H3 mode This is the mode for checking the current pressure in the system H3 and the current pressure in the boiler Example 25 w...

Page 45: ...ode for checking the output voltage of the fan H5 and the output voltage Example C5 will be displayed repeatedly on the screen Figure 59 10 5 7 H6 mode This is the mode for checking the current exhaust gas temperature H6 and the current exhaust gas temperature example 120 will be displayed repeatedly on the screen The unit is F Figure 60 10 5 8 H7 mode This is the mode for checking the current hot...

Page 46: ...re of the boiler H9 and the return temperature example 120 will be displayed repeatedly on the screen The unit is F Figure 63 10 5 11 HA mode This is the mode for checking the hot water and heating modes HA and the heating mode or the hot water mode example FF or 00 will be displayed repeatedly on the screen FF is the current hot water mode and 00 is the heating mode Figure 64 10 5 12 HB mode This...

Page 47: ... Move No 2 PCB DIP switch in the ON direction Figure 67 1 2 3 4 5 6 7 8 ON 2 Make sure the touch pad display is powered off Press the MODE and buttons for 5 seconds The outdoor reset lamp will turn on and C7 and ON or OFF will be displayed repeatedly on the screen Figure 68 3 At this time you can set ON or OFF using the or button C7 ON The boiler operates in outdoor reset mode using the ambient tem...

Page 48: ...rature 68 F 20 C Fan coil 120 F 60 C 180 F 82 C Cast iron baseboard 100 F 38 C 170 F 77 C Low mass radiant 82 F 28 C 140 F 60 C High mass radiant 82 F 28 C 122 F 50 C Radiator 118 F 48 C 170 F 77 C Custom User define Table 19 When 6 custom mode is set for C8 the user can set the temperature By pressing the MODE button the user can enter modes such as C9 CA Cb and CC and can set the temperature The ...

Page 49: ...tting P4 0 1 999 ft 2 000 4 500 ft 50 55 Table 24 How to program boiler 1 Connect the power supply if not already done 2 Press the power button to make sure the display on the touch pad is off Figure 71 3 Place dip switch 2 in the on position Figure 72 1 2 3 4 5 6 7 8 ON 4 Press and hold the and buttonsfor 5 seconds Figure 73 5 P0 will show on the display Press the MODE button to scroll through the...

Page 50: ...sible for the proper installation of this kit The installation is not proper and complete until the operation of the converted appliance is checked as specified in the manufacturer s instructions supplied with the kit A qualified service agency is any individual firm corporation or company which either in person or through a representative is engaged in and is responsible for the connection utilizat...

Page 51: ...r by hand using a Phillips screwdriver and pull the gas connector away from the TDR damper 6 Once the gas orifice is exposed remove the screw that holds the gas orifice in place and remove the gas orifice from its housing Figure 80 Packing Orifice Gas connector 7 Replace the old orifice piece and the packing with new part for use with LP gas Ensure that the orifice is properly seated inside the port DA...

Page 52: ... the exhaust analyzer hole Figure 82 Exhaust analyzer hole Cap Bracket 3 Insert analyzer into the exhaust analyzer hole and measure the gas air ratio using combustion analyzer is recommended Type Highfire Low fire CO2 CO2 NG 9 5 0 5 9 9 0 5 LPG 9 5 0 5 11 5 0 5 Table 25 Figure 83 4 Fully open several hot water fixtures and if the CO2 value at low fire is not within 0 5 of the value listed in the table...

Page 53: ... measuring the gas air ratio in maximum heat capacity operation do not adjust the gas valve set screw 7 When the gas conversion is completed attach the conversion sticker to the top of the rating plate Figure 85 This boiler was converted on to gas with Kit No by name and address of organization making this conversion who accepts the responsibility for the correctness of this conversion Conversion ...

Page 54: ... RST Black Red White Black Brown Brown Blue Black Red Solenoid Valve T D R Damper Gas Valve Red Red Pressure Sensor Red Flow Detect Switch Black Purple White White Exhaust Thermistor Yellow Yellow Remote controller 3 way Valve PUMP White White Green Green Blue Blue SRW Red SRW Red Condensate trap Blue Blue Green Red Gray Gray Black Black Black GND OPTION RCOP Brown Brown Outdoor Thermistor OPTION ...

Page 55: ... 55 Installation Instructions Singular Combi Boiler BTC 439003301 B 2021 07 13 Ladder Diagram Figure 87 ...

Page 56: ...r flow Switch on Water flow Switch on System Initalization E Error check E EF Error check A3 Error check A4 Error check E8 Error check AC Error check A8 Error check E3 Error check AD Error check EE Error check A5 Error check AB Error check A7 Error check E1 Error check AA Error check E0 Error check E2 Error check E4 Error check E7 Error check DHW mode DHW operation Heating DHW mode Heating operati...

Page 57: ...T2 Fan Motor Abnormal Flame Rod Abnormal Fan RPM stabilized Heating operation Pre purge PUMP ON FAN ON A2 Error check A6 Error check No No No T3 DHW Temperature T4 Setting the DHW Temperature Yes Yes Yes Ignitor On Ignitor Off Gas Valve ON Burner Operation T3 T4 Fan Motor Abnormal APS Abnormal Flame Rod Abnormal Fan RPM stabilized DHW operation Pre purge PUMP ON FAN ON A2 Error check AE Error chec...

Page 58: ...r e Brown Wires Blue Wires 8 Connect the two wires from the sensor to these two wires using wire caps 15 2 Outdoor Temperature Sensor Installation Guidelines Avoid installing the temperature sensor in a location where the temperature may change due to direct sunlight or a location where the representative outdoor temperature is not indicated The best place to install the temperature sensor is to t...

Page 59: ...oiler s front panel displays a fault Figure 92 70 30 66 26 62 22 58 18 54 14 50 10 46 6 42 38 34 68 28 64 24 60 20 56 16 52 12 48 8 44 40 36 32 190 122 158 90 174 106 142 182 114 150 82 166 98 130 186 118 154 86 170 102 138 134 178 110 146 78 162 94 126 Setting temperature F Outdoor temperature F Radiator High mass Cast iron Fan coil Low mass Finned tube The following table lists the default space...

Page 60: ...er may remain hot for few minutes after it is turned off Wait until the boiler has cooled down before cleaning to prevent burns WARNING SCALDHAZARD The boiler may remain hot for few minutes after it is turned off Wait until the boiler has cooled down before cleaning to prevent burns WARNING EXPLOSION Close the gas supply shutoff valve prior to working on the gas train Check for gas leaks after car...

Page 61: ...e 95 1 1 2 2 6 Open the drain valve Figure 96 7 Remove the strainer from the bottom of the boiler Figure 97 8 Close the drain valve when the water is completely drained 9 Remove the cold water inlet filter 10 Allow the residual water to drain from the boiler 11 When the water is completely drained reinsert the cold water inlet filter and close the drain valve Follow the steps in reverse order to refl...

Page 62: ...e Filter To maintain the boiler properly clean the air intake filter every 2 3 months If the air intake filter is clogged by dust or lint the boiler will cease to operate or error can occur To clean the air intake filter 1 Press the button to turn off the boiler 2 Disconnect the power supply to the boiler 3 Remove the boiler front cover by loosening the 2 Phillips screws securing it to the case Figure...

Page 63: ...ect and insulate all water pipes including the condensate trap drain line from freezing If the boiler will not be used for an extended period of time drain the boiler If you suspect that the boiler is frozen contact an authorized technician or licensed professional 16 5 Maintenance Schedules WARNING A qualified service agency must inspect the boiler at the beginning of every heating season and or w...

Page 64: ...Reported Problems Inspect any problems reported by the owner and correct before proceeding Inspecting the Installation Area 1 Verify that boiler area is free of any combustible materials gasoline and other flammable vapors and liquids 2 Verify that air intake area is free of any of the contaminants listed in Installation Manual If any of these are present in the boiler intake air vicinity they must...

Page 65: ...ler No water is available when a faucet is opened Is the water supply cut off Is the boiler frozen Are the pipes frozen 1 Open the cold water supply 2 Check if the boiler and or the pipes are frozen The hot water is not at the correct temperature Is the hot water faucet sufficiently open 1 Fully open the hot water faucet Water takes a long time to become hot after opening the hot water faucet Have...

Page 66: ...taller or licensed professional AB Abnormal operation heat exchanger temperature sensor 1 Contact original installer or licensed professional AC Abnormal operation DHW temperature sensor 1 Contact original installer or licensed professional AD Clog of condensate trap 1 Contact original installer or licensed professional AE Blockage of flue Pipe 1 Clean the vent terminal 2 Contact original installe...

Page 67: ... 67 Installation Instructions Singular Combi Boiler BTC 439003301 B 2021 07 NOTES ...

Page 68: ... 65 Grove St Watertown MA 02472 Tel 866 642 3198 Fax 603 965 7581 www bosch thermotechnology us BTC 439003301 B 07 2021 Bosch Thermotechnology Corp reserves the right to make changes without notice due to continuing engineering and technological advances ...

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