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A.O. Smith 120 through 250 Series, Installation, User And Service Manual

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A.O. Smith 120 through 250 Series Installation, User And Service Manual Download Page 39

Instruction manual BFC

37

is

3.11.1

Procedure for checking the supply pressure

To check the supply pressure, proceed as follows: 
1. Isolate (10.3 "Isolating the water heater from the mains") the appliance from 

the power supply.

2. Carefully remove the covers from the appliance.
3. The electrical section is now visible.

BFC 28 to 60

4. There is a test nipple before the gas control valve (for natural gas 

appliances) or before the pressure-reducing valve (for LPG appliances) so 
that the supply pressure can be measured.
This test nipple has a sealing screw. Loosen the sealing screw by a few 
turns. Do not completely loosen it as it can be difficult to retighten.

BFC 80 to 120

5. The gas control valve has a test nipple that can be used for measuring the 

supply pressure. 
This test nipple has a sealing screw. Loosen the sealing screw by a few 
turns. Do not completely loosen it as it can be difficult to retighten.

6. Open the gas supply and vent the gas supply line via the test nipple.

IMD-1095a R0

IMD-1096a R0

IMD-1097a R0

Summary of Contents for 120 through 250 Series

Page 1: ...0310 878 Innovation has a name Installation User and Service Manual High Efficient Condensing Water Heater BFC 28 30 50 60 80 100 120 BFC ...

Page 2: ...A O Smith UK Unit B8 Amstrong Mall Southwood Business Park Farnborough Hampshire GU14 0NR www aosmith co uk A O Smith Water Heaters is a trading name of Advance Services Sales Ltd Reg your installer ...

Page 3: ...3 CO2 adjustment 4 Check the switching pressure of the pressure switch 3 12 4 Switching pressure measurement 5 Erase the message SERVICE REQUIRED The displayed message can be reset in either of two ways 1 Temporary reset To postpone the message press RESET once The message will reappear on the display 7 days later 2 Full reset To fully reset the message press and hold both RESET and ENTER at the s...

Page 4: ...E2 ...

Page 5: ...n that stated in this manual and use other than in accordance with the General Conditions registered at the Chamber of Commerce Refer further to the General Conditions These are available on request free of charge Although considerable care has been taken to ensure a correct and suitably comprehensive description of all relevant components the manual may nonetheless contain errors and inaccuracies...

Page 6: ...4 Instruction manual BFC gis ...

Page 7: ...ons 17 3 4 Technical specifications 19 3 5 Installation diagram 25 3 6 Unvented water connections 26 3 7 Vented water connections 27 3 8 Gas connection 27 3 9 Air supply and chimney flue discharge 28 3 10 Electrical connection 33 3 11 Check the supply pressure gas controller pressure CO2 value and switching pressure 36 4 Conversion to a different gas category 45 4 1 Introduction 45 5 Filling 47 5 ...

Page 8: ...the water temperature 61 11 5 Week program 62 11 6 Starting and stopping the week program 62 11 7 Changing the appliance s standard week program 62 11 8 Adding times to a week program 64 11 9 Deleting times from a week program 65 11 10 Extra period 66 11 11 Settings 67 12 Service program 69 12 1 Introduction 69 12 2 Setting the hysteresis 69 12 3 Displaying the error history 69 12 4 Displaying the...

Page 9: ...izing maintenance 90 16 Warranty certificate 91 16 1 General warranty 91 16 2 Tank warranty 91 16 3 Conditions for Installation and use 91 16 4 Exclusions 92 16 5 Scope of the warranty 92 16 6 Claims 92 16 7 Obligations of A O Smith 92 17 Appendices 93 17 1 Introduction 93 17 2 Menu structure 94 17 3 Electrical diagram 96 17 4 Declaration of conformity 98 17 5 Week program card 99 ...

Page 10: ...Contents 8 Instruction manual BFC ...

Page 11: ...l and to follow the printed instructions may lead to personal injury and damage to the water heater 1 2 What to do if you smell gas Warning If you smell gas No naked flames No smoking Avoid causing sparks Do not use any electrical equipment or switch i e no telephones plugs or bells Open windows and doors Shut off the mains gas supply valve Warn occupants and leave the building After leaving the b...

Page 12: ...es of rated input not exceeding 70 kW BS 5440 Flueing and ventilation for gas appliances of rated input not exceeding 70 kW net 1st 2nd and 3rd family gases Part 1 Specification for installation of gas appliances to chimneys and for maintenance of chimneys Part 2 Specification for installation and maintenance of ventilation for gas appliances Institute of Gas Engineers and Managers IGEM Publicatio...

Page 13: ...he correct service interval it is recommended to arrange for the service and maintenance engineer to check the water heater on both the water and gas side within three months following installation Based on this check the best service interval can be determined Note Regular maintenance extends the service life of the water heater Both the end user and the service and maintenance engineer are respo...

Page 14: ...ater heater for a brief or long period of time Main menu This chapter describes the main menu of the display This is the actual menu for the user However the installation engineer and service and maintenance engineers will also need to use this menu Service program This chapter describes the service menu It is mainly intended for the installation engineer and service and maintenance engineers End ...

Page 15: ... tank through the hot water outlet 2 Once the water heater is completely filled with water it will constantly be under mains water pressure As hot water is drawn from the water heater cold water is immediately added The special design of the heat exchanger 11 ensures that the flue gases are first led downwards via the combustion chamber then upwards via the heat exchanger and downwards again along...

Page 16: ...6 control panel 7 temperature sensor T1 8 combustion chamber 9 anode 10 tank 11 heat exchanger 12 inspection and cleaning opening 13 temperature sensor T2 14 cold water inlet 15 drain valve 16 gas control valve 17 burner 18 fan 19 air supply hose 20 hot surface igniter 21 flame probe 22 chimney pipe 23 condens trap 24 insulation layer 28 potentiostat 29 base 30 venturi 58 flue gas test point 59 pr...

Page 17: ...nd T2 13 the controller monitors three temperatures that are important for safety The table explains the functioning of the temperature sensors Temperature protection 2 4 3 Gas control valve The controller opens the gas control valve so that gas can be supplied to the burner As a safety measure the gas control valve has two valves Both valves shut off the gas supply 2 4 4 Fan The fan 18 provides a...

Page 18: ...aused to the enamel coating in the water heater or to the tank A non return valve prevents excessive pressure build up in the water supply system This valve also prevents water from flowing backwards from the tank into the cold water supply system The pressure reducing valve protects the water heater against excess mains water pressure 3 4 2 General and electrical specifications These components a...

Page 19: ...amaging the water heater remove the packaging carefully We recommend unpacking the water heater at or near its intended location Caution The water heater may only be manoeuvred in an upright position Take care that the water heater is not damaged after unpacking 3 3 Ambient conditions The water heater is suitable for either open or room sealed combustion If installed as a room sealed water heater ...

Page 20: ...s governing drinking water for human consumption The table gives an overview of the specifications Water specifications Note If the water specifications deviate from those stated in the table then the tank protection cannot be guaranteed 16 Warranty certificate 3 3 4 Working clearances For access to the water heater it is recommended that the following clearances are observed see figure AA around ...

Page 21: ...r in a suitable metal leak tray The leak tray must have an appropriate waste water drain and must be at least 5 cm deep with a length and width at least 5 cm greater than the diameter of the water heater 3 4 Technical specifications The water heater is supplied without accessories Check the dimensions 3 4 Technical specifications gas data 3 4 3 Gas data and other specifications 3 4 2 General and e...

Page 22: ...20 Instruction manual BFC 3 4 1 Dimensions of the water heater Top and front view of the appliance Legend See the table BFC 28 30 50 60 BFC 80 100 120 ...

Page 23: ... 225 N Height of hot water outlet mm 1390 1910 1910 1910 2060 2060 2060 Ny y position of hot water outlet mm 205 205 205 205 205 205 205 P Height of cleaning opening mm 170 175 175 175 290 290 290 R Height of drain valve connection mm 85 75 75 75 225 225 225 S Height of T P valve connection mm 900 1410 1410 1410 1425 1425 1425 W Height of condensation drain mm 150 150 150 150 240 240 240 1 Cold wa...

Page 24: ... Adjustment range for hysteresis upwards o C 0 5 0 5 0 5 0 5 0 5 0 5 0 5 Default value for hysteresis upwards o C 5 5 5 5 5 5 5 Adjustment range for hysteresis downwards o C 0 10 0 10 0 10 0 10 0 10 0 10 0 10 Default value for hysteresis downwards o C 5 5 5 5 5 5 5 Number of electrical anodes 1 2 2 2 2 2 2 Observed pressure differential across the pressure switch Pa 165 165 165 165 260 260 260 Pre...

Page 25: ...ins pressure of cold water supply vented kPa bar 800 8 Maximum mains pressure of cold water supply unvented kPa bar 550 5 5 Maximum mains pressure of the protected cold supply setup kPa bar 500 5 T P overflow pressure kPa bar 700 7 T P overflow temperature C 97 ...

Page 26: ...1 0 9 0 1 0 8 9 1 0 8 9 1 0 8 9 1 0 Gas consumption m3 h 3 1 3 2 5 0 6 0 8 3 10 1 12 3 Gas category 3P G31 37 50 mbar Diameter of the venturi restrictor mm 6 00 6 00 6 00 6 00 6 60 6 60 6 60 Nominal load gross kW 31 5 32 6 51 1 62 0 84 8 103 3 126 1 Nominal output kW 31 0 32 7 50 3 60 4 84 2 100 7 121 8 Supply pressure mbar 37 50 37 50 37 50 37 50 37 50 37 50 37 50 Gas control valve pressure mbar ...

Page 27: ...ed 5 non return valve mandatory 6 circulation pump optional 9 drain valve 10 manual gas valve mandatory 11 service stop valve 12 temperature gauge optional 13 condensation drain 14 draw off points 15 expansion valve mandatory 16 expansion vessel mandatory 17 3 way aeration valve recommended 18 cold water head tank 19 float switch A cold water supply B hot water supply C circulation pipe D gas supp...

Page 28: ...ecessary energy loss 1 Optional fit a temperature gauge 12 so you can check the temperature of the tap water 2 Fit the T P valve 3 3 Fit a stop valve 11 in the hot water outlet pipe for servicing 3 6 3 Circulation pipe See C in the installation diagram 3 5 Installation diagram If an immediate flow of hot water is required at draw off points a circulation pump can be installed This improves comfort...

Page 29: ...gram 3 5 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 of the circulation system 2 Fit a non return valve 5 after the circulation pump to guarantee the direction of circulation 3 Fit two stop val...

Page 30: ...or flue gas discharge materials Warning The installation should be carried out by a competent person in compliance with general and locally applicable regulations 1 3 Regulations Depending on the approved installation types there are several alternatives for connecting the air supply and chimney flue The water heaters are approved for installations of type B23 C13 C33 C43 C53 and C63 This manual d...

Page 31: ...Instruction manual BFC 29 is Installation types IMD 0789 R0 C43 C13 C53 B23 C33 ...

Page 32: ...tes how to use the table Practical example of concentric flue gas discharge Example The figure shows a BFC 30 installation The water heater must be fitted with 25 m of concentric pipe C13 C33 and four 90 degree bends The configuration must be checked for compliance with the requirements stated in the table Installation type Description B23 Air for combustion is drawn from the boiler room C13 Conce...

Page 33: ... wall flue terminal specifications C13 IMD 0791 R0 Subject Description Wall flue terminal set 1x wall flue terminal incl wall flange clamping ring 1x pipe 500 mm 1x 90o bend Art No BFC 28 30 50 60 0302 504 1 BFC 80 100 120 0302 326 1 Manufacturer Muelink Grol Type M2000 MDV SEC Pipe material Construction Concentric Flue gas discharge Thick walled aluminium with lipped sealing ring Air supply Thin ...

Page 34: ... 1 BFC 80 100 120 0306 855 1 Manufacturer Muelink Grol Type M2000 DDV HR C Pipe material Construction Concentric Flue gas discharge Thick walled aluminium with lipped sealing ring Air supply Thin walled galvanised sheet steel Pipe diameters Flue gas discharge BFC 28 30 50 60 Ø 100 mm BFC 80 100 120 Ø 130mm Air supply BFC 28 30 50 60 Ø 150 mm BFC 80 100 120 Ø 200 mm 1 No other roof flue terminal ma...

Page 35: ...6 metres must be added for each bend This brings the total pipe length to 4 6 x 8 10 36 8 10 46 8 m This is less than the maximum length of 55 metres stated in the table The installation therefore fulfils the requirements 3 10 Electrical connection Warning The installation should be carried out by a competent person in compliance with general and locally applicable regulations 1 3 Regulations 3 10...

Page 36: ...er this isolating transformer please contact A O Smith Water Products Company The figure shows a view of the terminal block and the table explains the relevant connections Connector block In preparation you must first remove the two covers and the cover of the electrical section 1 Undo the screws of the covers 2 Carefully remove the covers from the water heater The electrical section is now visibl...

Page 37: ...u have no more connections to make Fit the cover on the terminal block Fit the covers onto the water heater 3 10 4 Isolating transformer An isolating transformer should be used if there is a case of floating neutral Note The total power consumed by the appliance goes via the isolating transformer 1 Refer to the fitting instructions provided with the isolating transformer Contact the supplier for d...

Page 38: ...t additional error signal The appliance has a terminal that is switched when an error is detected This can be used to signal errors for example with a bulb A 230V circuit can be powered directly Other voltages require a relay prescribed by the manufacturer 1 Connect the phase cables X1 and X2 to points 10 and 11 according to the table 3 10 2 Preparation If required connect earth to terminal 12 2 F...

Page 39: ...es or before the pressure reducing valve for LPG appliances so that the supply pressure can be measured This test nipple has a sealing screw Loosen the sealing screw by a few turns Do not completely loosen it as it can be difficult to retighten BFC 80 to 120 5 The gas control valve has a test nipple that can be used for measuring the supply pressure This test nipple has a sealing screw Loosen the ...

Page 40: ...ompany if the supply pressure is not correct You cannot yet start using the appliance You must now take the appliance out of service 10 3 Isolating the water heater from the mains Note After conversion you must check that the gas control valve is gastight 14 Shut off the gas supply 15 Disconnect the pressure gauge and retighten the sealing screw in the test nipple 16 If there is nothing else you n...

Page 41: ...d will then go to the main menu 9 Select SERVICE OPERATION FULL LOAD from the service menu 10 Confirm with The display shown here will appear The appliance is now in PARTIAL LOAD mode and will ignite 11 You must wait about 1 minute after the display shows the text RUNNING before reading the dynamic pressures the fan needs this time to get up to full speed so that a reliable reading can be obtained...

Page 42: ...le of the water heater 5 Open the gas supply and vent the gas supply line 6 Use the main switch to apply mains voltage to the appliance 7 Start 9 Starting the water heater the appliance 8 Go to the SERVICE OPERATION menu 9 Generate a heat demand by draining the appliance until it is cold or by raising the value for Tset in the SERVICE menu Use for this Full load measurement 10 From the service men...

Page 43: ...gher CO2 level and turning to the right clockwise means less gas lower CO2 level Note After conversion you must check that the gas control valve is gastight 14 If you have increased Tset set it back to the original value using 15 Continue with the CO2 measurement under partial load BFC 80 to 120 16 If the measure value is within the range given in the table of CO2 values If you have increased Tset...

Page 44: ...s measured value has remained stable for some time This may take several minutes 21 Compare the CO2 value measured against the value measured under full load Caution The CO2 value at partial load must be within 0 3 vol of the CO2 value measured or adjusted under full load 22 If necessary adjust the CO2 value using the adjuster screw until the value is within 0 3 vol of the CO2 value under full loa...

Page 45: ...3 11 4 Switching pressure measurement To measure the switching pressure proceed as follows 1 Isolate 10 3 Isolating the water heater from the mains the appliance from the power supply 2 Carefully remove the covers from the appliance 3 The electrical section is now visible 4 Remove the black caps from the measurement point of the pressure switch 5 Connect the of the pressure gauge to the H of the m...

Page 46: ...11 Check whether the measured value matches the value from the table 3 4 3 Gas data Note If the message PRESSURE SWITCH does not appear there is a fault This must be resolved first by a qualified service engineer 12 Shut off the gas supply 13 Disconnect the pressure gauge 14 Put the two black caps back on the pressure switch 15 Replace the covers ON Ê Ê Ê 13 45 Thursday 63ÉC Tset 65ÉC PRESSURE SWI...

Page 47: ...cial conversion kit You can order the conversion kit you need from the supplier of your appliance The conversion kit contains all the parts needed to do the conversion A description of how to do the conversion is also delivered with the kit The following conversions are possible 1 Conversion from natural gas to LPG 2 Conversion from LPG to natural gas 3 Conversion from natural gas to natural gas o...

Page 48: ...Conversion to a different gas category 46 Instruction manual BFC 4 is ...

Page 49: ...e 10 manual gas valve mandatory 11 service stop valve 12 temperature gauge optional 13 condensation drain 14 draw off points 15 expansion valve mandatory 16 expansion vessel mandatory 17 3 way aeration valve recommended 18 cold water head tank 19 float switch A cold water supply B hot water supply C circulation pipe D gas supply E overflow pipe H overflow protection IMD 0779 R0 T B A 4 17 E H C C ...

Page 50: ...ng a pressure reducing valve 1 The expansion valve in the protected cold supply set up is defective or incorrectly fitted 5 2 Filling vented installations To fill the water heater proceed as follows 1 Open the stop valve 11 in the hot water pipe and if present the stop valves 4 for the circulation pump 6 2 Close the drain valve 9 3 Open the nearest hot water draw off point 14 4 Open the stop valve...

Page 51: ...ve 10 manual gas valve mandatory 11 service stop valve 12 temperature gauge optional 13 condensation drain 14 draw off points 15 expansion valve mandatory 16 expansion vessel mandatory 17 3 way aeration valve recommended 18 cold water head tank 19 float switch A cold water supply B hot water supply C circulation pipe D gas supply E overflow pipe H overflow protection IMD 0779 R0 T B A 4 17 E H C C...

Page 52: ...lve 4 in the cold water inlet A 10 Open the drain valve 9 6 2 Draining vented installations Some service activities require the water heater to be drained The procedure is as follows 1 Activate the MENU with 2 Position the cursor in front of OFF 3 Confirm OFF with 4 Wait until the fan has stopped The icon is then dimmed Caution Failure to wait until the fan stops can cause damage to the water heat...

Page 53: ... Icons and their meaning 7 4 ON OFF switch on controller The ON OFF switch of the controller turns the water heater ON and OFF Note that in the OFF position the water heater remains electrically live in order for the continuous pump to stay running After switching on the text INTERNAL CHECK appears on the display for about 10 seconds The main menu 11 Main menu then appears If no selection is made ...

Page 54: ...down further to see the options EXTRA PERIOD and SETTINGS The selected option is confirmed using Pressing the button takes you back one page in a menu and discards all options selected in the current menu Note The button is also used to reset the water heater following an error 7 6 PC connection The PC connection is exclusively intended to enable technicians from A O Smith to read the status and h...

Page 55: ...the time the day and T1 9 3 The appliance s heating cycle line three the programmed water temperature Tset line four is empty when the water heater is idle or depending on the operating cycle 9 3 The appliance s heating cycle displays a text such as HEAT DEMAND 8 2 3 EXTRA In this mode one extra period is programmed and activated In this mode the OFF orPROG mode is temporarily overruled to fulfil ...

Page 56: ...de comprising a letter and two digits followed by the error description lines two to four alternately a brief explanation of the error and a brief action to resolve the error Caution The displayed action to resolve the error may only be performed by a service and maintenance engineer There are various types of errors LOCK OUT ERRORS When the cause has been removed these errors require a reset with...

Page 57: ...g This message appears when the anode protection is no longer active If the message appears you must contact your service and maintenance engineer Note The water heater continues to function when this message appears WARNING POWER ANODE MALFUNCTION ...

Page 58: ...Status of the water heater 56 Instruction manual BFC 8 gis ...

Page 59: ...un through the heating cycle 9 3 The appliance s heating cycle If the heating cycle is not run there is no heat demand if this is the case Tset will probably need to be set 11 4 Setting the water temperature 9 3 The appliance s heating cycle The appliance s heating cycle is activated when the measured water temperature T1 falls below the threshold value Tset This threshold value depends on the cur...

Page 60: ... takes place The icon is activated The message IGNITION appears 6 After ignition the flame is detected and the appliance will be running This means that actual heating has started The icon is dimmed The icon is activated The message RUNNING appears 7 When the water is up to temperature the heat demand ceases and the post purge starts This takes about 25 seconds The icons and are dimmed The icon is...

Page 61: ...ng the water heater from the mains The water heater may only be isolated from mains power in the correct way The correct procedure is as follows 1 Activate the MENU with 2 Position the cursor in front of OFF 3 Confirm OFF with Caution Failure to wait until the fan stops can cause damage to the water heater 4 Wait until the fan has stopped The icon is then dimmed 5 Switch the water heater OFF posit...

Page 62: ...Shutting down 60 Instruction manual BFC 10 gis ...

Page 63: ...he main menu open then after 30 seconds the water heater will automatically return to the mode it was previously in 11 2 Notation convention for menu related instructions The MENU of the controller is divided into sub menus For example SETTINGS is one of the functions reached from the main menu The menu SETTINGS is itself divided into sub menus For example LANGUAGE is a sub menu of SETTINGS So for...

Page 64: ...r temperature setting is 65o C If you want you can change every setting in the appliance s standard week program If the water temperature becomes too low while the week program is running the appliance will run through the heating cycle 9 3 The appliance s heating cycle and return to the week program The following topics are covered here Starting and stopping the week program Changing the applianc...

Page 65: ... the minute digits which will blink Note Because the switch off time can never be earlier than the switch on time the switch off time setting is automatically adjusted with the switch on time 4 Use and to set the minutes In the example this is 15 Confirm with The cursor moves to the switch off hour digits which will blink 11 7 2 Week program setting the switch off time 1 Use and to set the hours I...

Page 66: ... Confirm with 11 8 Adding times to a week program Call up the menu to INSERT switch on and switch off times into a week program as follows 1 WEEK PROGRAM PROGRAM OVERVIEW Confirm with The display shows the menu for the week program The cursor points to the active period 2 Scroll to INSERT Confirm with The submenu for adding a period will appear Example As an example we will program an extra period...

Page 67: ...ou are now working in the delete sub menu the cursor is replaced with an exclamation mark and the period settings will blink 4 Scroll with to the day to be deleted For example SU Sunday in the second period See the figure Confirm with 5 The lines showing switch on off times are replaced by the text DELETE BLOCK See the figure Confirm with or use to cancel The switching period has been deleted You ...

Page 68: ...rsor moves to the hour digits which will blink 2 Use and to set the switch on hour to the desired value In the example this is 08 Confirm with The cursor moves to the minute digits which will blink Note Because the switch off time can never be earlier than the switch on time the switch off time setting is automatically adjusted with the switch on time 3 Use and to set the minutes In the example th...

Page 69: ...maintenance engineer Regulation interval water temperature Ignition speed of fan Working speed of fan 11 11 1 Setting menu language To set menu language 1 Call up the menu for selecting the language as follows 2 SETTINGS Confirm with The display shows the menu for settings 3 The cursor is positioned beside LANGUAGE Confirm with The display shows the language selection menu 4 Scroll with to the des...

Page 70: ... specifications Note This category is solely intended for the installation engineer and or service and maintenance engineer The corrected data is shown in the table of general and electrical data 3 4 2 General and electrical specifications Call up the menu to display the water heater specifications as follows 1 SETTINGS Confirm with 2 Scroll with to SPECIFICATIONS Confirm with The display shows th...

Page 71: ...starts when the water temperature drops to 5 C below the SETPOINT and ends when the water reaches 5 C above the SETPOINT Set the hysteresis as follows HYSTERESIS UP The figure shows an example Set the hysteresis as follows HYSTERESIS DOWN 12 3 Displaying the error history Display the error history as follows ERROR HISTORY The controller will display an overview of Blocking errors and Lock out erro...

Page 72: ...maintenance 14 2 Determining service interval The service interval is determined by the number of months that the appliance has been running This can be set to 6 9 and 12 months The default service interval is 12 months When the preset number of hours has been reached an appropriate message 8 4 Service condition will appear Set the service interval as follows SERVICE INTERVAL 12 8 Service mode The...

Page 73: ...legionella prevention on or off select ANTI LEGIONELLA Select NO to switch legionella prevention off Select YES to switch legionella prevention on The following screen appears Select START to activate the period currently displayed The following display appears This display indicates that legionella prevention is switched on 12 9 2 Changing legionella prevention start time If you wish to change th...

Page 74: ...Service program 72 Instruction manual BFC 12 is ...

Page 75: ...ecommended action See the figures The first shows a possible error the second shows the appropriate checking action There are various types of errors all falling into one of two groups LOCK OUT ERRORS When the cause has been removed these errors require a reset with the button before the water heater can resume operation BLOCKING ERRORS These errors disappear automatically once the cause of the er...

Page 76: ...ation engineer or local gas company The display is off The water heater is off Start the water heater 9 Starting the water heater No supply voltage present 1 Check whether the isolator is ON 2 Check that there is power to the isolator 3 Check whether the ON OFF switch of the controller is ON position I 4 Check whether there is power to the electrical connector block 5 The measured voltage must be ...

Page 77: ...ing the burner Insufficient or no hot water The water heater is off Start the water heater 9 Starting the water heater No supply voltage present 1 Check whether the isolator is ON 2 Check that there is power to the isolator 3 Check whether the ON OFF switch of the controller is ON position I 4 Check whether there is power to the electrical connector block 5 The measured voltage must be 230 VAC 15 ...

Page 78: ...ou must contact your installation engineer S03 blocking error Open circuit in sensor 2 of temperature sensor T1 at the top of the tank 1 Sensor is not correctly connected Connect the sensor lead to JP5 See the electrical diagram 17 Appendices Damaged cable and or defective sensor Replace the cable and or sensor To replace the necessary parts you must contact your installation engineer S04 blocking...

Page 79: ...r installation engineer S13 blocking error Short circuit in sensor 2 of temperature sensor T1 at the top of the tank 1 Short circuit in sensor circuit Replace the cable and or sensor To replace the necessary parts you must contact your installation engineer S14 blocking error Short circuit from dummy 1 Short circuit in sensor circuit Replace the dummy sensor 2 To replace the necessary parts you mu...

Page 80: ...ation engineer to have an isolating transformer installed F02 lock out error Fan fails to run at correct speed Defective motor and or rotor 1 Check the motor and rotor 2 Replace the fan if the motor or rotor is defective 3 Reset controller See the electrical diagram 17 Appendices To have the wiring replaced and a new fan fitted you must contact your installation engineer Damaged wiring 1 Check the...

Page 81: ... correctly fitted Refit them if necessary 3 Check for cracks in the hoses on the pressure switch and in the air supply hose between fan and burner If necessary replace the hoses 4 Check whether the chimney flue is compliant 3 9 Air supply and chimney flue discharge 5 Check for blockage in the chimney flue Remove any blockage that may be present 6 Check for blockage in the condensation water discha...

Page 82: ... Measure the resistance across the hot surface igniter This must lie between 2 and 10 Ohm at room temperature 4 Check that the hot surface igniter lights up during ignition 5 If necessary replace the hot surface igniter If the error persists contact your installation engineer To replace the necessary parts you must contact your installation engineer Defect in the ionisation circuit 1 Check that th...

Page 83: ...d or is persistent contact your installation engineer To replace the necessary parts you must contact your installation engineer F08 lock out error Error message from safety relay Flame detection before the gas control valve opened 1 Reset controller 2 If the error appears again replace the controller If the error cannot be resolved or is persistent contact your installation engineer To replace th...

Page 84: ...ror EEPROM contents do not match the software version Processor software error C03 blocking error Reset error Too many resets in too short a period Wait for the error to disappear maximum 1 hour If the error does not disappear replace the water heater controller To replace the necessary parts you must contact your installation engineer C04 blocking error Appliance selection error Incorrect water h...

Page 85: ...necessary Replace the sensor if the error persists To replace the necessary parts you must contact your installation engineer E04 lock out error Defect in the dummy sensor 2 The two temperature sensors detect a difference of 10o C over a period of at least 60 seconds 1 Check the wiring of the dummy 1 and dummy 2 2 Reset the controller if necessary Replace the dummy sensor if the error persists To ...

Page 86: ...gineer Anode protection not working The cables between the potentiostat and anodes are loose or have been connected incorrectly The earth connection of the anodes is loose The water heater is not filled with water Water heater runs but displays a warning Note The water heater is functioning but there is no anode protection for the tank 1 Connect the wiring correctly and the warning will disappear ...

Page 87: ...ntenance engineer to check the water heater on both the water and gas side three months after installation Based on this check the best service interval can be determined 14 2 Determining service interval The service interval is a feature of the controller to help the service and maintenance engineer set the maintenance frequency based on the number of months that the appliance has been running Th...

Page 88: ...Service interval 86 Instruction manual BFC 14 is ...

Page 89: ...own the installation type water heater model and the full serial number of the water heater These details can be found on the rating plate Only by ordering with this information can you be sure to receive the correct spare parts 15 2 Preparation for maintenance To test whether all components are still working properly complete the following steps 1 Activate the MENU with 2 Use and to place the cur...

Page 90: ... and switching pressure and adjust them where necessary 13 Check that all components of the chimney flue system are properly attached 14 Check the pressure differential across the pressure switch 3 11 4 Switching pressure measurement and if this is too low the heat exchanger should be cleaned 15 4 3 Clean heat exchanger 15 Test the operation of the overflow valve of the protected cold supply setup...

Page 91: ...e the figure 2 Undo the bolts 3 Remove the cover and the gasket 4 Inspect the tank and remove the loose scale deposits and contamination 5 If the scale cannot be removed by hand descale the water heater with a descaling agent Contact the supplier manufacturer for advice on what descaling agent to use 6 Close the cleaning opening To avoid damage to the tank tighten the bolts that fasten the lid wit...

Page 92: ... flue Note Check the pressure differential again after cleaning If the pressure differential is too low following cleaning please contact the supplier of the water heater 15 5 Finalizing maintenance See Eratta 1 Fill the water heater 5 Filling 2 Start the water heater 9 Starting the water heater 3 Check the CO2 value 3 11 3 CO2 adjustment 4 Check the switching pressure of the pressure switch 3 11 ...

Page 93: ...r the warranty shall be reduced to one year from the original installation date 16 3 Conditions for Installation and use The warranty set out in articles 1 and 2 will apply solely under the following conditions a The water heater is installed under strict adherence to A O Smith installation instructions for the specific model and the relevant government and local authority installation and buildin...

Page 94: ...tive water heater other than by an approved service engineer 16 5 Scope of the warranty The obligations of A O Smith by virtue of the warranty provided do not extend beyond delivery free of charge from the warehouse of the parts or components or water heater to be replaced transport labour installation and other costs associated with the replacement shall not be borne by A O Smith 16 6 Claims A cl...

Page 95: ...17 Appendices 17 1 Introduction This appendix contains Menu structure 17 2 Menu structure Electrical diagram 17 3 Electrical diagram Declaration of conformity 17 4 Declaration of conformity Week program card 17 5 Week program card ...

Page 96: ... REGULATION INTERVAL FULL LOAD PARTIAL LOAD EXTRA PERIOD SERVICE INTERVAL SETTINGS LANGUAGE SERVICE OPERATION START OPERATION SELECT APPLIANCE PROGRAM OVERVIEW PUMP RELAY HISTORY OF ERRORS CHANGE SETPOINT APPLIANCE HISTORY WEEK PROGRAMMA HYSTERESE DOWN ON HYSTERESE UP START OPERATION CONTROL SERVICE PROGRAM MAIN MENU HYSTERESE OFF ...

Page 97: ...Instruction manual BFC 95 is ...

Page 98: ... 6 6 X X 6 6 X X 6 JP3 JP11 X 6 6 X F3 X 3 X 2 F1 1 X J2 Q P O S 6 6 12 11 16 15 14 13 19 18 17 20 24 21 22 23 J33 A R J38 J37 X X J34 J35 J39 J36 4 4 M X X 4 X 2 1 3 2 1 1 2 3 1 2 3 4 2 1 1 5 6 2 3 7 8 4 5 1 5 1 1 6 2 1 4 1 2 5 6 3 6 1 2 4 3 1 7 1 1 2 9 7 5 3 1 11 13 15 10 4 2 8 6 16 12 14 7 1 6 2 4 5 1 3 5 1 3 1 2 4 5 5 7 4 4 2 0 I 2 1 1 L N 3 2 1 X X X X 2 4 3 1 N F 230VAC 50Hz N L Primair N L ...

Page 99: ...switch M Display N Fan O Temperature sensor T2 bottom of tank P Dummy Q Temperature sensor T1 top of tank R Selection resistor S Push button T Electrical anodes U Signalling for electrical anodes V Potentiostat CONTROLLER CONNECTIONS J2 Power connection for controller J19 Extra error signal connection J20 Gas control valve connection J21 Program controlled pump connection J40 Fan connection J36 Co...

Page 100: ...Appendices 98 Instruction manual BFC 17 is 17 4 Declaration of conformity Declaration of conformity ...

Page 101: ...N OFF OFF 5 ON C ON OFF OFF 6 ON C ON OFF OFF 7 ON C ON OFF OFF 8 ON C ON OFF OFF 9 ON C ON OFF OFF 10 ON C ON OFF OFF 11 ON C ON OFF OFF Period DAY TIME Tset Pump 1 ON MO 14 30 70 C ON OFF OFF MO 16 15 Period DAY TIME Tset Pump 12 ON C ON OFF OFF 13 ON C ON OFF OFF 14 ON C ON OFF OFF 15 ON C ON OFF OFF 16 ON C ON OFF OFF 17 ON C ON OFF OFF 18 ON C ON OFF OFF 19 ON C ON OFF OFF 20 ON C ON OFF OFF ...

Page 102: ...Instruction manual BFC 100 ...

Page 103: ...detection 51 gas control valve 51 heat demand 51 installation diagram 25 installation engineer 10 J join air supply 28 circulation pipe 26 27 cold water side 26 27 electrical 33 flue gas discharge 28 gas 27 hot water side 26 L language setting 67 liability 3 M maintenance condensation water discharge 89 descaling 88 gas side 89 heat exchanger 90 performing 87 preparation 87 scale 88 mode ERROR 54 ...

Page 104: ... OFF switch 51 trademarks 3 U user 10 W warranty 91 exclusions 92 General information 91 installation and conditions of use 91 scope 92 water composition 18 setting the temperature 61 water heater displaying history 69 displaying specifications 68 displaying the selection 70 protection 15 types 9 17 ...

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