A.O. Smith BFM - 100 Installation & Service Manual
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A.O. Smith BFM - 100 Installation & Service Manual

A.O. Smith BFM - 100 Installation & Service Manual

A.o. smith gas water heater installation user and service manual
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  • Page 3 Any brand names mentioned in this manual are registered trademarks of their respective owners. Liability A.O. Smith Water Products Company accepts no liability for claims from third parties arising from improper use other than that stated in this manual and in accordance with the General Conditions registered at the Eindhoven Chamber of Commerce.
  • Page 4 Instruction manual BFM...

  • Page 5: Table Of Contents

    Table of contents Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - 7 About the appliance - - - - - - - - - - - - - - - - - - - - - - - - - - - - 7 What to do if you smell gas- - - - - - - - - - - - - - - - - - - - - - - - - 7 Regulations - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 7 Maintenance - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8...
  • Page 6 13.7 Obligations of A.O. Smith - - - - - - - - - - - - - - - - - - - - - - - - - 68 Electrical diagram - - - - - - - - - - - - - - - - - - - - - - - 69 14.1...

  • Page 7: Introduction

    Introduction About the appliance This manual describes how to install, service and use the BFM appliance. The BFM appliance is a gas-fired sealed boiler with a fan in the air supply. The parallel or concentric chimney connections are appliance-dependent. Possible installation types are C13 or C33.

  • Page 8: Maintenance

    Introduction Furthermore, the installation must comply with the manufacturer's instructions. guidelines published on or prior to the moment of installing, will apply to the installation. Maintenance A service should be carried out at least once a year, both on the water side and on the gas side.

  • Page 9: Overview Of This Document

    Overview of this The table provides an overview of the contents of this document. document Contents of this document Chapter Target groups Working principle of the appliance Installation Filling Draining The control panel Status of the appliance Starting and running Shutting down Troubleshooting Performing maintenance...
  • Page 10 Introduction Instruction manual BFM...

  • Page 11: Working Principle Of The Appliance

    Working principle of the appliance Introduction Topics covered in this chapter: • • • • General working The figure shows a cut-away view of the appliance. principle of the appliance Instruction manual BFM General working principle of the appliance; The appliance's heating cycle;...
  • Page 12 Working principle of the appliance Cut-away view of the appliance Legend Only applicable numbers are mentioned. 2. hot water outlet 5. pressure switch 8. combustion chamber 9. anode 10. tank 11. heat exchanger 12. inspection and cleaning opening 14. cold water inlet 15.

  • Page 13: The Appliance's Heating Cycle

    In this appliance, the cold water enters the bottom of the tank through the cold water inlet (14). The heat of combustion is conducted to the water by the combustion chamber (50) and heat exchanger (11). The heated tap water leaves the tank through the hot water outlet (2).

  • Page 14: Water Temperature Protection

    Working principle of the appliance • • • 2.4.2 Water temperature protection By means of the frost, high-limit and safety thermostats, the burner control monitors three temperatures that are important for safety. The table explains the working principle of the thermostats with sensors. Temperature protection Protection Description...

  • Page 15: Safety Of The Installation

    2.5.3 T&P valve A T&P valve is only mandatory in an unvented installation. However, A.O. Smith also recommends the use of a T&P valve in vented installations. A T&P (Temperature and Pressure Relief) valve monitors the pressure in the tank and the water temperature at the top of the tank.
  • Page 16 Working principle of the appliance Instruction manual BFM...

  • Page 17: Installation

    Installation in compliance with the general and local regulations imposed by the gas, water and power supply companies and the fire service. The appliance may only be installed in a room that complies with the requirements stated in national and local ventilation regulations Introduction This chapter describes the installation activities to be carried out before the...
  • Page 18 Installation 3.3.2 Maximum floor load Allow for the appliance's weight with respect to the maximum floor load; refer to the table. Weight of the appliance filled with water BFM 30 539 kg 3.3.3 Water composition The appliance is intended for heating drinking water. The drinking water must comply with the regulations governing drinking water for human consumption.

  • Page 19: Technical Specifications

    Working clearances Technical specifica- The appliance is supplied without accessories. Check the dimensions tions and other specifications accessories you plan to use. Instruction manual BFM (3.4.1 "Dimensions of the appliance"), gas data (3.4.2 "General and electrical specifications") IMD-0241 R1 (3.4.3 "Gas data") of any...

  • Page 20: Dimensions Of The Appliance

    Installation 3.4.1 Dimensions of the appliance Plan and elevation of the appliance 10º 45º 37º Replacement of burner pressure regulator or blank plate BFM30-50-80-100 (2) = BFM 100, 120 10º 37º 45º IMD-0057 R5 Instruction manual BFM...
  • Page 21 Dimensions (all measurements in mm unless otherwise indicated) Dimens Description Total height Height of top of appliance Position on pallet Appliance diameter Depth Width Diameter of chimney flue y-position air supply Height of gas connection Diameter of Air supply Height of cold water supply Height of hot water outlet Height of cleaning opening Height of drain valve connection...
  • Page 22 Installation 3.4.3 Gas data Gas data Description Gas category: 30 through 100 II 2H3+ Natural gas G20 - 20 mbar Orifice diameter Diameter of pilot flame orifice (1) = Blank plate (2) = Burner pressure regulator Nominal load (upper value) Nominal output Supply pressure (†)

  • Page 23: Installation Diagram

    Installation diagram 3.5.1 Installation This figure shows the installation diagram. This diagram is used in the sections in which the actual connection process is described. Installation diagram Legend UNVENTED Only applicable numbers are mentioned. 1. pressure reducing valve (mandatory) 3. T&P valve (mandatory) 4.

  • Page 24: Water Connections, Vented

    Installation Water connections, Vented in compliance with general and local regulations 3.6.1 Cold water side See (A) in the installation diagram 1. Fit an approved stop valve (4) on the cold water side between the cold water 3.6.2 Recirculation pipe You can install a top to bottom circulation pump to prevent water stacking in the boiler.

  • Page 25: Circulation Pipe

    3.6.5 Circulation pipe See (C) in the installation diagram If an immediate flow of hot water is required at draw-off points, a circulation pump can be installed. This improves comfort and reduces water wastage. 1. Fit a circulation pump (6) of the correct capacity for the length and resistance 2.

  • Page 26: Gas Connection

    Installation 3.7.5 Circulation pipe See (C) in the installation diagram If an immediate flow of hot water is required at draw-off points, a circulation pump can be installed. This improves comfort and reduces water wastage. 1. Fit a circulation pump (6) of the correct capacity for the length and resistance 2.

  • Page 27: Air Supply And Flue

    Air supply and flue 3.9.1 Introduction in compliance with general and local regulations The BFM 30, 50 and 80 differ from the BFM 100 and 120 in how the air supply and chimney flue are connected. 3.9.2 Installing chimney flue components for BFM 30, 50, 80 The BFM-appliances are approved for installation types C13 and C33.
  • Page 28 Installation 3.9.3 Concentric wall flue terminal BFM 30-50-80 Wall flue terminal 3.9.4 C13 concentric wall flue terminal specifications (BFM 30, 50, 80) C13 Concentric wall flue terminal specifications Subject Wall flue terminal set: • 1x Wall flue terminal (incl. wall flange &...
  • Page 29 3.9.5 Concentric roof flue terminal BFM 30, 50, 80 Roof flue terminal Instruction manual BFM IMD-0061 R2...
  • Page 30 Installation 3.9.6 C33 concentric roof flue terminal specifications (BFM 30, 50, 80) C33 concentric roof flue terminal specifications Subject Roof flue terminal set: • 1x Roof flue terminal (incl. clamping ring) • 1x pipe 1000 mm • 1x mounting flange Pipe material Pipe diameters (1) No other roof flue terminal is permitted.
  • Page 31 A.O. Smith prescribes the use of a concentric roof or wall flue terminal, exclusively of a type approved for the appliance. Use of an incorrect roof or wall flue terminal can cause the installation to malfunction. You must also fulfil the following requirements: •...
  • Page 32 Installation 3.9.9 C13 concentric wall flue terminal specifications (BFM 100, 120) C13 Concentric wall flue terminal specifications Subject Wall flue terminal set: • 1x Wall flue terminal (incl. wall flange & clamping ring) • 1x Clamping ring • 1x Transition piece •...
  • Page 33 3.9.10 Concentric roof flue terminal BFM 100, 120 Roof flue terminal Instruction manual BFM IMD-0239 R1...

  • Page 34: Electrical Connection

    Installation 3.9.11 C33 concentric roof flue terminal specifications (BFM 100, 120) C33 concentric roof flue terminal specifications Subject Roof flue terminal set: • 1x Wall flue terminal (incl. clamping ring) • 1x Pipe 1000 mm • 1x Mounting flange Pipe material Pipe diameters (1) No other roof flue terminal is permitted.

  • Page 35: Connecting The Mains Power

    In preparation you should first remove the two plastic covers and the protective cap of the electrical section. 1. Undo the screws of the plastic covers. 2. Carefully remove the covers from the appliance. 3. Loosen the 2 screws (A) of the electrical section, and remove the protective Consult the electrical diagram component connections.

  • Page 36: Checking The Supply Pressure And Burner Pressure

    Installation 3.11 Checking the supply pressure and burner burner pressure, you must fill pressure check the supply pressure and burner pressure. gauges. This procedure assumes that these two gauges are available. If the appliance is to be run on a different gas category than the factory preset gas category (see type plate) then you must first convert different gas category") Gas control for BFM 30 through 100...
  • Page 37 Gas control for BFM 120 Legend 1. burner pressure regulator 3. burner pressure regulator adjustment screw 6. supply pressure test nipple 7. gas control 8. manifold test nipple 1. Isolate the appliance from the power supply 2. There are two test nipples on the gas control. Test nipple (6) is used to check 3.
  • Page 38 Installation 11. Use the pressure gauge to read the burner pressure at nipple (8). Refer to plate or high-low control, then you cannot adjust the pressure. In this case, consult your installation engineer or supplier. If the appliance is indeed fitted with a burner pressure regulator, then you can adjust the pressure.

  • Page 39: Conversion To A Different Gas Category

    Conversion to a different gas category engineer. If the appliance must operate on a family of gases (LP gas or natural gas) or other gas category than that for which the appliance has been set at the factory, the appliance will have be adapted using a special conversion kit. conversion is complete.

  • Page 40: Orifice Replacement

    Conversion to a different gas category Orifice replacement Gas control assembly removed 1. strain relief 2. spark electrode lead 3. flame probe lead 4. burner control 5. gas control connector(s) 6. gas control 7. gas coupling 8. burner tray 1. Remove the protective cover from the control column: 2.

  • Page 41: Replacement Of Burner Pressure Regulator Or Blank Plate Bfm30-50-80-100

    8. If the gas table 9. If necessary, replace the blank plate or burner pressure regulator. 10. Re-fit the burner tray and fasten it using the screws. 11. Fit the gas coupling to the gas control and firmly tighten the connector(s) of 12.
  • Page 42 Conversion to a different gas category Instruction manual BFM...

  • Page 43: Filling

    Filling Installation diagram Legend UNVENTED Only applicable numbers are mentioned. 1. pressure reducing valve (mandatory) 3. T&P valve (mandatory) 4. stop valve (recommended) 5. non-return valve (mandatory) 6. circulation pump (optional) 7. top to bottom circulation pump (optional) 9. drain valve 10.

  • Page 44: Filling Unvented Installations

    Filling Filling unvented To fill the appliance, proceed as follows: installations 1. Open the stop valve (11) in the hot water pipe and, if present, the stop valves 2. Close the drain valve (9). 3. Open the nearest hot water draw-off point (14). 4.

  • Page 45: Draining

    Draining Installation diagram Legend UNVENTED Only applicable numbers are mentioned. 1. pressure reducing valve (mandatory) 3. T&P valve (mandatory) 4. stop valve (recommended) 5. non-return valve (mandatory) 6. circulation pump (optional) 7. top to bottom circulation pump (optional) 9. drain valve 10.

  • Page 46: Draining Unvented Installations

    Draining Draining unvented installations Some service activities require the appliance to be drained. The procedure is as follows: 1. Shut down the appliance by setting the ON/OFF switch on the control panel 2. Isolate the water heater from the power supply by putting the isolator 3.

  • Page 47: Draining Vented Installations

    Draining vented installations Some service activities require the appliance to be drained. The procedure is as follows: 1. Shut down the appliance by setting the ON/OFF switch on the control panel 2. Isolate the water heater from the power supply by putting the isolator 3.
  • Page 48 Draining Instruction manual BFM...

  • Page 49: The Control Panel

    The control panel Introduction Topics covered in this chapter: • Control panel; • Explanation of icons; • ON/OFF switch; • Control thermostat; • Burner control reset button. Control panel The figure shows the control panel. The control panel The control panel comprises: •...

  • Page 50: Burner Control Reset Button

    The control panel Burner control reset button An error in the appliance can cause a lockout of the burner control. When this happens, the reset button lamp will be lit. Once the cause of the error has been rectified, you can reset the appliance using the reset button.

  • Page 51: Status Of The Appliance

    Status of the appliance Introduction Topics covered in this chapter: • Operating modes; • Error conditions; Operating modes When running, the appliance has three basic operating modes, namely: • ELECTRICALLY ISOLATED In this mode, the appliance is off and no components are live.
  • Page 52 Status of the appliance Instruction manual BFM...

  • Page 53: Starting And Running

    Starting and running Introduction Topics covered in this chapter: • Starting the appliance; • The appliance's heating cycle. Starting the appliance Start the appliance as follows: 1. Fill the appliance "Filling"). 2. Open (3.5 "Installation diagram") the manual gas valve. 3.
  • Page 54 Starting and running Instruction manual BFM...

  • Page 55: Shutting Down

    Shutting down 10.1 Introduction Topics covered in this chapter: • Shutting down the appliance for a brief period (OFF mode); • Isolating the appliance from the mains; • Shutting the appliance down for a long 10.2 Shutting down the appliance for a brief period (OFF mode) To shut the appliance down for a brief period, you must activate frost protection using the appliance's heating...
  • Page 56 Shutting down Instruction manual BFM...

  • Page 57: Troubleshooting

    Troubleshooting 11.1 Introduction This chapter deals with the following problems with the appliance: • • • • • • When the appliance is in an error condition, the heat demand is (temporarily) ignored, and you cannot draw hot water. The frost protection is also out of action.

  • Page 58: Troubleshooting: General Errors

    11.2 Troubleshooting: general errors Warning Maintenance may only be performed by a qualified service and maintenance engineer. General errors Symptom Cause Solution Gas smell Gas leak Water leakage Leakage from a water Tighten the threaded connection connection (threaded) Leakage from another Trace the leak nearby water appliance or pipe segment...

  • Page 59: Troubleshooting: Insufficient Hot Water

    11.3 Troubleshooting: insufficient hot water Warning Maintenance may only be performed by a qualified service and maintenance engineer. Insufficient hot water Symptom Cause Solution Insufficient hot water Water temperature Set the control thermostat setting (T ) is too low value Hot water supply is 1.

  • Page 60: Troubleshooting: No Hot Water

    11.4 Troubleshooting: No hot water No hot water Symptom Cause Solution No attempt to start No supply voltage 1. Check if the isolator is ON. heating cycle present 2. Check whether there is power to the isolator 3. Check whether there is power to the electrical connector block 4.
  • Page 61 Symptom Cause Solution Burner control reset There are three possible causes for this error. In order to determine the cause, you must button (burner control cause the error to appear again: lock out error) 1. Reset the appliance by pressing the reset button 1x 2.
  • Page 62 Instruction manual BFM...

  • Page 63: Performing Maintenance

    Performing maintenance 12.1 Introduction maintenance engineer. At each service, the appliance undergoes maintenance on both the water side and the gas side. The maintenance must be carried out in the following order. and model, and the full serial number of the appliance. These details can be found on the rating plate.

  • Page 64: Water-Side Maintenance

    Performing maintenance 12.3 Water-side mainte- nance 12.3.1 Introduction The following steps must be carried out on the water side: 12.3.2 Checking the anodes Timely replacement of the anodes extends the service life of the appliance. The appliance's anodes must be replaced as soon as they are 60% used or more (take this into consideration when determining the maintenance frequency).
  • Page 65 1. Remove the cover plate (1) on the outer jacket (see the figure). 2. Carefully remove the insulation layer (2) and set it to one side. This will be 3. Undo the bolts. 4. Remove the lid, the gasket and the O-ring. 5.

  • Page 66: Gas-Side Maintenance

    Performing maintenance 12.4 Gas-side mainte- nance 12.4.1 Introduction The following steps must be carried out on the gas side: 12.4.2 Clean the burner(s) 1. Detach the burner(s) 2. Remove all contamination present on the burner(s). 3. Fit the burner(s) 12.4.3 Clean the orifice(s) 1.

  • Page 67: Warranty (Certificate)

    A.O. Smith shall offer to replace the defective water heater with an entirely new water heater of equivalent size and quality. The warranty period given on the replacement water heater shall be equal to the remaining warranty period of the original water heater that was supplied.

  • Page 68: Exclusions

    Smith warranty expressly set out in this Certificate. Under the terms of the supplied warranty, A.O. Smith is not liable for damage to persons or property caused by (sections or parts, or the glass-lined steel tank of) a (replacement) water heater that it has supplied.

  • Page 69: Electrical Diagram

    Electrical diagram 14.1 Introduction This chapter shows the electrical diagram(s) and accompanying legend. Instruction manual BFM...

  • Page 70: Bfm Electrical Diagram

    Electrical diagram 14.2 BFM Electrical Diagram. 230VAC 50 Hz S S S S 1 = brown, 2 = blue, 3 = yellow/green, 4 = black, 5 = white, 6 = red, 7 = white/orange, 8 = white/purple, 9 = black/green, 10 = black/red, 11 = black/white 0305485 R2 Instruction manual BFM...
  • Page 71 COMPONENTS: OPTIONAL COMPONENTS Instruction manual BFM Mantle Isolating transformer DPS (Differential air pressure switch) Filter Reset button Frost thermostat Control thermostat ON/OFF switch Safety thermostat High-limit thermostat Burner control Terminal block Earth strip Relay Clock Potentiostat...
  • Page 72 Electrical diagram Instruction manual BFM...
  • Page 73 Index ambient temperature 17 burner pressure 36 claims 68 connect air supply 27 circulation piping 25, 26 cold water side 24, 25 electrical 34, 35 gas 26 hot water side 25 shut pipe 24, 25 connecting air supply 27 connecting circulation pipe 25, 26 connecting cold water side 24, 25 connecting flue gas discharge 27 connecting hot water side 25...
  • Page 74 Index Instruction manual BFM 0306 723 4.0 UK...

This manual is also suitable for:

Bfm 120Bfm 30Bfm 50Bfm 80

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