A.O. Smith BFC 100 Installation, User And Service Manual Download Page 2

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A.O. Smith Water Heaters

Unit B7-B8 Armstong Mall
Southwood Business Park
Farnborough Hampshire
GU14 ONR UK

T : 0870 267 6484
[email protected]
www.aosmith.co.uk

A.O. Smith Europe

De Run 5305
PO Box 70
5500 AB Veldhoven
The Netherlands

Data is subject to change.

Summary of Contents for BFC 100

Page 1: ...0311704 R2 4 BFC Cyclone High Efficient Condensing Water Heater BFC 28 30 50 60 80 100 120 Installation User and Service Manual 4222 EN ...

Page 2: ...B7 B8 Armstong Mall Southwood Business Park Farnborough Hampshire GU14 ONR UK T 0870 267 6484 sales aosmith co uk www aosmith co uk A O Smith Europe De Run 5305 PO Box 70 5500 AB Veldhoven The Netherlands Data is subject to change ...

Page 3: ...r than in accordance with the General Conditions registered at the Chamber of Commerce For more information refer to the General Conditions These are available on request free of charge We believe that this manual provides you with accurate and complete descriptions of all relevant components If you nonetheless find errors or inaccuracies in this manual please inform A O Smith This helps us to fur...

Page 4: ... boilers of rated inputs between 70 kW net and 1 8 MW net 2nd and 3rd family gases BS 6700 Design installation testing and maintenance of services supplying water for domestic use within buildings and their cartilages Specifications BS EN 806 2 Specification for installations inside buildings conveying water for human consumption Part 2 Design BS 5546 Specification for installation of hot water su...

Page 5: ... 70 5500 AB Veldhoven The Netherlands Telephone 0870 AOSMITH free 0870 267 64 84 General 31 40 294 25 00 Fax 31 40 294 25 39 E mail info aosmith nl Website www aosmith co uk In the event of problems with your gas electricity or water supply connections contact your supplier 0311704_BFC_28 120_III_ENEN_V2 4 2022 10 17 5 ...

Page 6: ...6 ...

Page 7: ...ibes the correct installation and maintenance procedures Target group The information in this manual applies to three target groups users installation engineers service and maintenance engineers The User part is intended for the end users The Installation Maintenance and Service part is intended for the installation engineers and the service and maintenance engineers Notation conventions This manu...

Page 8: ...eed special attention Note A note gives more information on a topic Caution Obey the caution instructions to prevent damage of the water heater Warning Obey the warning instructions to prevent danger of personal injury and serious damage to the water heater Document identification Article number Language Version 0311704 EN 2 4 n c w 8 ...

Page 9: ...tification 8 User part 13 1 Introduction 15 2 Safety 17 3 Interface 19 3 1 Operator interface 19 3 2 Explanation of icons 19 3 3 Control switch 20 3 4 Buttons 20 3 5 PC connection 20 3 6 Status of the water heater 21 3 6 1 Operating modes 21 3 6 2 Error conditions 22 3 6 3 Service conditions 23 3 6 4 Anode warning 23 4 Use 25 4 1 Turn on the water heater 25 0311704_BFC_28 120_III_ENEN_V2 4 2022 10...

Page 10: ...s to a week program 34 4 3 8 Deleting times from a week program 35 4 3 9 Extra period 36 4 3 10 Settings 38 Installation Maintenance and Service part 41 5 Introduction 43 5 1 About the water heater 43 5 2 The appliance s heating cycle 43 5 3 Working principle 43 5 4 Operating cycle 45 6 Safety 47 6 1 Safety instructions 47 6 2 Instructions on the water heater 48 6 3 Safety devices 49 6 3 1 Protect...

Page 11: ...cedure for checking the gas control valve pressure 70 7 8 4 CO2 adjustment 71 7 8 5 Switching pressure measurement 73 7 8 6 Turn on the water heater 74 7 9 Decommisioning 74 7 9 1 Turn off the water heater 74 7 9 2 Draining 74 8 Conversion of gas type 77 9 Settings 79 9 1 Operator interface 79 9 2 Service program 79 9 2 1 Hysteresis 79 9 2 2 Display the error history 80 9 2 3 Display the water hea...

Page 12: ...t exchanger 87 10 4 Finalization 88 11 Troubleshooting 89 11 1 Errors and warnings 89 11 1 1 General errors 90 11 1 2 Displayed errors 91 11 1 3 Warnings 96 12 Appendices 97 12 1 Technical details 97 12 2 Dimensions 101 12 3 Gas details 105 12 4 Week program card 107 12 5 Electrical wiring diagram 109 12 6 Menu structure 111 12 7 Declaration of conformity 112 12 8 Warranty 113 Index 115 12 ...

Page 13: ...User part 0311704_BFC_28 120_III_ENEN_V2 4 2022 10 17 13 ...

Page 14: ...14 ...

Page 15: ...hrough the water inlet 1 The heated water leaves the tank at the top through the hot water outlet 2 To operate the water heater the operator interface 3 and control switch 4 are used Fig BFC water heater 1 2 3 4 1 Water inlet 2 Water outlet 3 Operator interface 4 Control switch 0311704_BFC_28 120_III_ENEN_V2 4 2022 10 17 15 ...

Page 16: ...16 User part ...

Page 17: ...er Some propellants bleaching agents and degreasing agents etc disperse of explosive vapors and or cause accelerated corrosion If the water heater is used in a room where such substances are stored or used the warranty will be void Caution Installation maintenance and service may only by carried out by a qualified engineer Caution The water heater is not intended for use by persons with reduced ph...

Page 18: ...18 User part ...

Page 19: ...enu see section 4 3 The service program see section 9 2 This chapter is specifically intended for the service and maintenance engineer and installation engineer In this manual the display of the operator interface is shown as in the figure both with and without icons 3 2 Explanation of icons The table explains the meanings of the icons Name Explanation Heat demand Heat demand detected Purge Pre an...

Page 20: ...ction 4 3 The buttons are Buttons for UP and DOWN Enter ENTER Reset button RESET The arrows and indicate that you can scroll up and or down Use and to scroll The cursor points to the option to be activated In the display as shown in the figure you can scroll through the main menu The main menu comprises OFF ON WEEK PROGRAM EXTRA PERIOD and SETTINGS You have to scroll down further to see the option...

Page 21: ...ay with the following information line one the text ON line two the time the day and T1 see section 4 1 1 line three the programmed water temperature Tset line four is empty when the water heater is idle or depending on the operating cycle see section 4 1 1 displays a text such as HEAT DEMAND 3 6 1 3 EXTRA In this mode one extra period is programmed and activated In this mode the OFF or PROG mode ...

Page 22: ...ine three the next scheduled switch on time line four displays the text PERIOD ACTIVATED In all modes the temperature may at any moment drop below the desired temperature The water heater then enters an operating cycle This operating cycle see section 4 1 1 is identical for all basic operating modes Note Setting and if necessary programming of the basic operating modes are described in the main me...

Page 23: ...rvice interval has been incorrectly selected contact the service and maintenance engineer for instructions on how to rectify this Information on the frequency of maintenance is provided elsewhere in the manual see section 10 3 6 4 Anode warning 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 w...

Page 24: ...24 User part ...

Page 25: ... The appliance is now in ON mode If there is a heat demand the appliance will run through the heating cycle see section 4 1 1 If the heating cycle is not run there is no heat demand if this is the case Tset will probably need to be set see section 4 3 3 4 1 1 The appliance s heating cycle The entire cycle is explained in the following example which assumes the water heater is in operating mode ON ...

Page 26: ...nd are dimmed The icon is activated After a number of seconds pre glow the gas control valve is opened and ignition takes place The icon is activated The message IGNITION appears 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 When the water is up to temperature th...

Page 27: ...ollows Press to select the main menu Using and place the cursor beside OFF Confirm with ENTER The frost protection cuts in when the water temperature drops below 5 C The text FROST will then appear on line one of the display The water heater will heat the water to 20 C Tset before dropping back to mode OFF Caution The anode protection remains active when the OFF mode is selected Note These values ...

Page 28: ...sition 0 using the control switch on the operator interface Isolate the water heater from the power supply by setting the isolator between the water heater and the mains power supply to position 0 Note Setting the main switch between the water heater and the electricity mains to 0 will switch off the power supply to the potentiostat there is then no longer any anode protection 4 2 3 Turn off for a...

Page 29: ...he language and the time see section 4 3 10 You can also use this option to display the regulation interval temperature and the ignition and working speeds of the fan Note If you fail to make any selection with the main menu open then after 30 seconds the water heater will automatically return to the mode it was previously in 4 3 1 Notation conventions for menu related instructions The MENU of the...

Page 30: ...vent excessively frequent switching on and off there is a heating margin The standard setting for this margin is 5 C The appliance starts heating up if the water temperature is 5 C below the SETPOINT We refer to this margin as the hysteresis The service and maintenance engineer can set the hysteresis value 4 3 3 2 Setting water temperature during ON mode The water temperature can also be directly ...

Page 31: ...rm with ENTER A week program can be shut down simply by activating a different operating mode for example the ON mode 4 3 6 Changing the appliance s standard week program Note First fill in the desired week program on the supplied week program card A week program is made up of a number of programmable periods in which you can have the appliance switch on and off A period consists of switch on time...

Page 32: ...e cursor to SU Confirm with ENTER The day indicated by blinks Use and to set the desired day In the example this is SU Sunday Confirm with ENTER The cursor moves to the hour digits which will blink Use and to set the hours In the example this is 08 Confirm with ENTER 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...

Page 33: ...gram controlled pump If required a pump can be controlled during the period Use and to set PUMP ON The pump ensures a regular circulation of hot water in the hot water pipes You can skip this step if you there is no pump in your hot water circuit Confirm with ENTER The cursor moves to SAVE Confirm with ENTER The display shown in the figure will appear If you wish you can use to scroll to another d...

Page 34: ...n example we will program an extra period in which the switch on time is set to 18 00 and the corresponding switch off time to 22 00 The water temperature will be set to 75ºC and the pump will run continuously Proceed as follows Set the switch on time see section 4 3 6 1 Set the switch off time see section 4 3 6 2 Set the water temperature see section 4 3 6 3 Set the program controlled pump see se...

Page 35: ...irm with ENTER Scroll with to PROGRAM OVERVIEW Confirm with ENTER The display shows the menu for the week program Scroll with to DELETE Confirm with ENTER To warn you that you are now working in the delete sub menu the cursor is replaced with an exclamation mark and the period settings will blink Scroll with to the day to be deleted For example SU Sunday in the second period See the figure Confirm...

Page 36: ...ithout modifying the active week program or without taking the water heater out of OFF mode frost protection active If the water heater is running under an extra period then this is indicated in the display with the text EXTRA During the extra period if the water temperature becomes too low the water heater will run through the operating cycle see section 4 1 1 then return to the extra period The ...

Page 37: ...h off period Setting the switch off time Use and to set the hours In the example this is 012 Confirm with ENTER The cursor moves to the minute digits which will blink Use and to set the minutes In the example this is 45 Confirm with ENTER The cursor moves to the water temperature See the figure Setting the water temperature Use and to set the water temperature In the example this is 75 C Confirm w...

Page 38: ...rent day of week and time Displayable water heater specifications this category is only relevant to the installation engineer and or service and maintenance engineer Regulation interval water temperature Ignition speed of fan Working speed of fan 4 3 10 1 Setting menu language To set menu language Call up the menu for selecting the language as follows SETTINGS Confirm with ENTER The display shows ...

Page 39: ...he cursor moves to the hour digits which will blink Scroll with and to the current hour for example 15 Confirm with ENTER The cursor moves to the minute digits which will blink Scroll with and to the next minute for example 45 Confirm the minute setting with ENTER The time has been set Note The water heater takes no account of daylight saving 4 3 10 3 Displaying water heater specifications Note Th...

Page 40: ...TINGS Confirm with ENTER Scroll with to SPECIFICATIONS Confirm with ENTER The display shows the sub menu for displaying water heater specifications Scroll with to the section to be displayed for example REGULATION INTERVAL The corresponding display appears 1 2 3 40 User part ...

Page 41: ...Installation Maintenance and Service part 0311704_BFC_28 120_III_ENEN_V2 4 2022 10 17 41 ...

Page 42: ...42 User part ...

Page 43: ...he venturi 30 on the intake side of the fan The 1 1 gas to air ratio always guarantees the most efficient gas air mixture In this water heater the cold water enters the bottom of the tank through the cold water inlet 14 The tap water heated by the combustion chamber 8 and heat exchanger 11 leaves the tank through the hot water outlet 2 Once the water heater is completely filled with water it will ...

Page 44: ...ontroller 5 Pressure switch 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 ...

Page 45: ...gas is mixed with the air in the venturi 30 This mixture is ignited by the hot surface igniter 20 and the water becomes heated As soon as the water temperature approaches Tset the fan rpm drops to the partial load speed this is also referred to as modulating Once T1 rises above Tset the heat demand ends and the controller stops the operating cycle When responding to both the start and end of the h...

Page 46: ...46 Installation Maintenance and Service part ...

Page 47: ...d the flue gas discharge components Make sure that the venting system does not exceed the maximum number of 45º and 90º bends and the maximum pipe length Caution Make sure that the diameter and length of the gas supply pipe are large enough to supply sufficient capacity to the water heater Caution Make sure that the condensate drain is connected to the waste water discharge using an open connectio...

Page 48: ...r The water heater has some safety instructions on its cover The text Read the installation instructions before installing the appliance The text Read the user instructions before putting the appliance into operation Also the packaging has some safety instructions The text Read the installation instructions before installing the appliance The text Read the user instructions before putting the appl...

Page 49: ...e burner As a safety measure the gas control valve has two valves Both valves shut off the gas supply 6 3 1 3 Fan The fan 18 provides an optimum air supply when there is a heat demand As a safety feature the fan ensures that any gases present in the combustion chamber are removed both before and after combustion We refer to this as pre and post purge The fan speed is continuously monitored by the ...

Page 50: ... installation With a vented installation excess pressure is taken up by the open cold water head tank The level of the cold water head tank determines the maximum working pressure in the tank refer to the general and electric specifications in the appendices see section 12 The water heater must also be fitted with a vent pipe from the hot water pipe which opens into the cold water head tank Ideall...

Page 51: ...e you must obey local legislation related to waste disposal Never discard your old device together with regular waste Put the device into a municipal waste collection depot for electrical and electronic equipment If necessary ask your supplier or your service and maintenance engineer for advice 0311704_BFC_28 120_III_ENEN_V2 4 2022 10 17 51 ...

Page 52: ...52 Installation Maintenance and Service part ...

Page 53: ...ly to prevent damage to the water heater 7 2 Conditions The water heater is suitable for room sealed and for open combustion For room sealed combustion the air inlet does not depend on the installation site For open combustion you must comply with the local applicable directives and ventilation regulations for open water heaters 7 2 1 Ambient conditions The installation site must be frost free If ...

Page 54: ...figure AA around the water heater s control column and cleaning openings 100 cm BB all sides of the water heater 50 cm Top of the water heater 100 cm Fig Working clearances BFC 28 60 Fig Working clearances BFC 80 120 A A AA B B B B A A AA Note When installing the water heater be aware that any leakage from the tank and or connections can cause damage to the immediate environment or floors below th...

Page 55: ...d 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 Condensate 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 outlet C Circulation pipe D Gas supply ...

Page 56: ...xpansion vessel 16 Fit an expansion valve 15 and connect the overflow side to an open waste water pipe 7 4 1 2 Hot water side See B in the installation diagram see section 7 3 Note Insulating long hot water pipes prevents unnecessary energy loss Optional fit a temperature gauge 12 so you can check the temperature of the tap water Fit the T P valve 3 Fit a stop valve 11 in the hot water outlet pipe...

Page 57: ...emperature of the tap water Fit a stop valve 4 in the hot water outlet pipe for servicing If a circulation pipe is required continue by installing the circulation pipe see section 7 4 1 3 7 4 2 3 Circulation pipe See C in the installation diagram see section 7 3 If an immediate flow of hot water is required at draw off points a circulation pump can be installed This improves comfort and reduces wa...

Page 58: ...h horizontal air inlet and flue gas outlet in same pressure zone C33 Closed Concentric and or parallel venting system with vertical air inlet and flue gas outlet in same pressure zone C43 Closed Water heaters on common air inlet and flue gas outlet concentric and or parallel in a multiple floor building C53 Closed Separate air inlet and flue gas outlet terminal types mixed Air inlet and flue gas o...

Page 59: ...Fig Venting systems 0311704_BFC_28 120_III_ENEN_V2 4 2022 10 17 59 ...

Page 60: ...mm 130 mm Diameter air inlet 150 mm 200 mm Description parts A O Smith Part number A O Smith Part number Wall terminal set A wall terminal 1 a 500 mm concentric pipe and a 90 bend 0302504 0311465 Wall terminal 0302505 0302313 Roof terminal set A roof terminal 2 a 1000 mm concentric pipe and a roof plate 0311463 0311464 Roof terminal 0311458 0306390 Concentric pipe 500 mm 0302499 0302301 Concentric...

Page 61: ...r to the table for the correct pipe dimensions of the C13 and C33 concentric systems Description Unit BFC 28 60 BFC 80 120 Diameter flue discharge air inlet mm mm 100 150 130 200 Maximum length m 40 15 Maximum number of 45º and 90º bends 7 4 Caution Both conditions stated in the table must be fulfilled Even if you use less than the stated maximum number of bends the maximum pipe length still may n...

Page 62: ... 6 mm 130 0 6 0 6 mm Diameter air inlet Description parts A O Smith Part number A O Smith Part number Wall terminal 1 0302505 0302313 Roof terminal 2 0311463 0306390 Adapter box concentric to parallel terminal side 0307142 0306801 Adapter box concentric to parallel water heater side 0304204 0309605 Parallel pipe 500 mm 0307160 0306804 Parallel pipe 1000 mm 0307161 0306802 Parallel bend 45 0310197 ...

Page 63: ...he default diameter of 130 mm is insufficient diameter 150 mm should be used Any diameter enlargement must be carried out on both air inlet and flue gas outlet Caution Always make sure the installation is in compliance with the requirements stated in this table Caution Use a run off of 50 mm per meter towards the water heater Calculate the maximum length of the air inlet and the flue gas outlet se...

Page 64: ...t pipe dimensions of the C43 C53 and C63 concentric systems Description BFC 28 60 BFC 80 120 Manufacture venting material Muelink Grol Muelink Grol Construction Concentric Concentric Material flue gas outlet Thick walled aluminum Thick walled aluminum Material air inlet Thin walled galvanized steel Thin walled galvanized steel Diameter flue gas outlet 100 mm 130 mm Diameter air inlet 150 mm 200 mm...

Page 65: ... Fig Terminal block A Screws B Cover C Terminal block 7 7 1 Preparation In preparation you must first remove the two covers and the cover of the electrical section Undo the screws of the covers Carefully remove the covers from the water heater The electrical section is now visible Loosen the 2 screws A and remove the cover B from the electrical section The connector block C is now visible Note Con...

Page 66: ...l power consumed by the appliance goes via the isolating transformer Refer to the fitting instructions provided with the isolating transformer Contact the supplier for details of the correct isolating transformer Connect the neutral N live L and earth A of the power cables to terminals 4 through 9 of the connection block according to the table see section 7 7 1 Fit the cables in the strain relief ...

Page 67: ...ke sure that the drain valve 9 is closed Open the nearest hot water draw off point 14 Open the stop valve 4 of the cold water supply pipe A Cold water flows into the water heater Fill the water heater until a full water jet flows from the nearest draw off point The water heater is completely full Open all draw off points to bleed the entire installation of air The water heater is now under water s...

Page 68: ...r checking the supply pressure To check the supply pressure proceed as follows Isolate the appliance from the power supply see section 4 2 2 Carefully remove the covers from the appliance The electrical section is now visible BFC 28 to 60 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 pressu...

Page 69: ...for about 10 seconds and will then go to the main menu Select SERVICE OPERATION FULL LOAD from the service menu Confirm with ENTER The display shown here will appear The appliance is now in Full load mode and will ignite 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 you can get a re...

Page 70: ... few turns Do not completely loosen it as it can be difficult to retighten Open the gas supply Connect a pressure gauge to the test nipple Switch on the power to the appliance using the isolator on the appliance Switch the controller ON by setting the 0 I switch to position I The display will now show INTERNAL CHECK for about 10 seconds and will then go to the main menu 7 8 3 1 Procedure for check...

Page 71: ...oltage to the appliance Start the appliance see section 4 1 Go to the SERVICE OPERATION menu 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 From the service menu select SERVICE OPERATION FULL LOAD Confirm with ENTER The appliance is now in FULL LOAD mode and will ignite The appliance is now r...

Page 72: ...he measure value is within the range given in the table of CO2 values If you have increased Tset set it back to the original value using Continue with the CO2 measurement under partial load If the measured value is not within the range of CO2 values from the table then you may not start the appliance up Switch off the appliance Turn off the gas supply to the appliance Put the covers back on the ap...

Page 73: ...lockwise means more less lower CO2 level and turning to the right clockwise means more gas higher CO2 level Note After conversion you must check that the gas control valve is gastight Remove the CO2 measurement probe from the measurement nipple of the flue gas outlet pipe Put the cap back on the measurement nipple of the flue gas outlet pipe Shut off the gas supply Replace the covers 7 8 5 Switchi...

Page 74: ...hut off the gas supply Disconnect the pressure gauge Put the two black caps back on the pressure switch Replace the covers 7 8 6 Turn on the water heater Refer to the procedure in the user part to Turn on the water heater see section 4 1 7 9 Decommisioning To decommission the water heater Turn off the water heater see section 7 9 1 Drain the water heater 7 9 1 Turn off the water heater Refer to th...

Page 75: ...cursor in front of OFF Confirm OFF with ENTER 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 heater Switch the water heater OFF position 0 using the control switch on the operator interface Isolate the water heater from the power supply by setting the isolator between the water heater and the mains power supply to po...

Page 76: ...76 Installation Maintenance and Service part ...

Page 77: ...ou can order the conversion kit you need from the supplier of your water heater The conversion kit contains all the parts needed to do the conversion and a description of how to do the conversion The following conversions are possible Conversion from natural gas to LPG Conversion from LPG to natural gas Conversion from natural gas to natural gas Caution After the conversion make sure that the wate...

Page 78: ...78 Installation Maintenance and Service part ...

Page 79: ...y the selected water heater Switching the pump on or off Setting the service interval Service mode Setting legionella prevention Setting the central heating configuration These sub menus are briefly described in the following paragraphs Note The notation convention for the service menu is identical to that of the main menu see section 4 3 1 The difference is you use to bring up the service program...

Page 80: ... an ellipsis is displayed The display first shows the Blocking errors When ENTER is pressed the Lock out errors are then displayed The figure shows an example of Blocking errors In this case the text ERROR HISTORY is followed by B The figure shows an example of Lock out errors In this case the text ERROR HISTORY is followed by L Note For an overview of all errors and the possible causes please ref...

Page 81: ...rogram periods is currently active During this period the pump relay setting is OFF If the pump relay is set ON in the service menu the pump will nonetheless remain OFF The pump will only switch ON once the week program period has ended 9 2 6 Setting the service interval The service interval is a feature of the controller to help the service and maintenance engineer set the frequency of maintenanc...

Page 82: ...er adjustment the set point must be set back to the original value using if you exit the SERVICE OPERATION menu or if no buttons are pressed for a period of 15 minutes the water heater will revert to the original operating mode Temporarily raising the setpoint during FULL LOAD or PARTIAL LOAD SERVICE OPERATION Select FULL LOAD or PARTIAL LOAD The example below describes the situation for FULL LOAD...

Page 83: ...iod currently displayed The following display appears This display indicates that legionella prevention is switched on 9 2 8 2 Changing legionella prevention start time If you wish to change the start time select ANTI LEGIONELLA YES Change The following display appears Now set the day and time the same way as described for setting an extra period in the week menu see section 4 3 9 In this case how...

Page 84: ...84 Installation Maintenance and Service part ...

Page 85: ...u receive the correct spare parts look at the data plate for the full serial number the water heater model and the used gas category Use this information when you order the spare parts Do the following maintenance activities Preparation see section 10 1 Water side maintenance see section 10 2 Gas side maintenance see section 10 3 Finalization see section 10 4 10 1 Preparation To test whether all c...

Page 86: ...s from the discharge points of all valves and remove any scale deposits that may be present Drain the water heater see draining see section 7 9 2 10 2 Water side maintenance To do water side maintenance Descale the tank see section 10 2 1 Clean the condensate drain see section 10 2 2 10 2 1 Descale the tank Scale and lime build up prevent effective conduction of the heat to the water Periodic clea...

Page 87: ... Gas side maintenance Do gas side maintenance when the water heater does not operate correctly the air pressure differential is not correct and or the CO2 value is not correct To do gas side maintenance Clean the burner see section 10 3 1 Clean the heat exchanger see section 10 3 2 10 3 1 Clean the burner Detach the burner Remove all contamination present on the burner Fit the burner 10 3 2 Clean ...

Page 88: ...QUIRED The displayed message can be reset in either of two ways Temporary reset To postpone the message press RESET once The message will reappear on the display 7 days later Full reset To fully reset the message press and hold both RESET and ENTER at the same time for 5 sec On completion of the full reset of the message the message below will appear on the display This message will NOT be shown a...

Page 89: ... resets automatically to resume operation The code is displayed continuously and the back light of the display blinks Errors are reported on the display as follows Line one an error code and a brief description The code consists of a letter and two digits Lines two three and four a long description alternating with a recommended action See the figures The first shows a possible error the second sh...

Page 90: ...ion Tighten the threaded connection There is a condensate leakage Make sure that the condensation water discharge is working properly If necessary correct the water discharge There is a leakage from another nearby water heater or pipe segment Trace the leakage There is a leakage from the water heater tank Contact the supplier of your water heater Explosive ignition The gas supply pressure is incor...

Page 91: ...ri Remove any contamination from the venturi inlet Leakage between venturi and flexible venturi connector Make sure that the flexible venturi connector is not damaged If necessary replace the flexible venturi connector Make sure that the flexible venturi connector is correctly connected If necessary tighten the clamp Recirculation of flue gases Make sure that the CO2 value measured in the flue gas...

Page 92: ...e the cable and or sensor S12 blocking error Short circuit in sensor 1 of temperature sensor T1 at top of tank 1 Short circuit in sensor circuit Replace the cable and or sensor 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 S14 blocking error Short circuit from dummy 1 Short circuit in s...

Page 93: ...between the pressure switch and the controller If necessary replace the wiring Pressure switch not closing Check the speed of the fan see section 12 1 Check that the hoses on the pressure switch and the air supply hose between fan and burner are correctly fitted Refit them if necessary Check for cracks in the hoses on the pressure switch and in the air supply hose between fan and burner If necessa...

Page 94: ...ect roof or wall flue terminal has been installed see section 7 6 If necessary install the correct roof or wall flue terminal Check that the roof or wall flue terminal discharges into a permitted area F06 blocking error Short circuit between flame probe and earth Damaged cable in contact with metal surface or bent flame probe Check the wiring and the flame probe Replace the wiring and or flame pro...

Page 95: ... 1 hour If the error does not disappear replace the water heater controller C04 blocking error Appliance selection error Incorrect water heater selection Incorrect selection resistor Check whether the correct water heater is selected see section 12 1 If the correct water heater is selected fit the correct selection resistor If incorrect water heater selected select the correct one 1 2 3 E01 blocki...

Page 96: ... the warranty will void Anode protection is 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 Connect the wiring correctly and the warning will disappear If the wiring is correct but the warning remains check that the earth connection is good and whether the t...

Page 97: ... 65 Hysteresis upwards adjustment range C 0 5 0 5 0 5 0 5 Hysteresis upwards default value C 5 5 5 5 Hysteresis downwards adjustment range C 0 10 0 10 0 10 0 10 Hysteresis downwards default value C 5 5 5 5 Number of electrical anodes 1 2 2 2 Observed pressure differential across the pressure switch Pa 165 165 165 165 Pressure differential to open the pressure switch Pa 115 115 115 115 Heating time...

Page 98: ... Unit BFC 28 BFC 30 BFC 50 BFC 60 Load profile XXL XXL XXL XXL Energy Efficiency Class Energy Label A A A A Energy Efficiency 91 91 91 90 Daily Electricity Consumption kWh 0 207 0 210 0 211 0 212 Daily Fuel Consumption kWh GCV 26 501 26 552 26 562 26 632 Mixed Water 40 C V40 ltr 1255 Additional Load Profile 3XL 3XL Energy Efficiency 89 89 Daily Electricity Consumption kWh 0 251 0 252 Daily Fuel Co...

Page 99: ...ards adjustment range C 0 5 0 5 0 5 Hysteresis upwards default value C 5 5 5 Hysteresis downwards adjustment range C 0 10 0 10 0 10 Hysteresis downwards default value C 5 5 5 Number of electrical anodes 2 2 2 Observed pressure differential across the pressure switch Pa 260 260 260 Pressure differential to open the pressure switch Pa 210 210 210 Heating time ΔT 45 C min 18 15 12 Electrical Electric...

Page 100: ... P overflow temperature C 97 Description Unit BFC 80 BFC 100 BFC 120 Load profile 3XL 3XL 3XL Energy Efficiency Class Energy Label Energy Efficiency 93 93 92 Daily Electricity Consumption kWh 0 237 0 346 0 257 Daily Fuel Consumption kWh GCV 49 811 49 922 50 060 Mixed Water 40 C V40 ltr 1368 Additional Load Profile Energy Efficiency Daily Electricity Consumption kWh Daily Fuel Consumption kWh GCV M...

Page 101: ... 1390 1925 1925 1925 Ny y position of hot water outlet mm 205 205 205 205 P Height of cleaning opening mm 170 175 175 175 R Height of drain valve connection mm 85 75 75 75 S Height of T P valve connection mm 900 1410 1410 1410 W Height of condensation drain mm 150 150 150 150 1 Cold water supply connection external R 11 2 R 11 2 R 11 2 R 11 2 2 Hot water outlet male R 11 2 R 11 2 R 11 2 R 11 2 3 G...

Page 102: ...Fig Dimensions BFC 28 30 50 60 102 Installation Maintenance and Service part ...

Page 103: ... hot water outlet mm 2060 2060 2060 Ny y position of hot water outlet mm 205 205 205 P Height of cleaning opening mm 290 290 290 R Height of drain valve connection mm 225 225 225 S Height of T P valve connection mm 1425 1425 1425 W Height of condensation drain mm 240 240 240 1 Cold water supply connection external R 11 2 R 11 2 R 11 2 2 Hot water outlet male R 11 2 R 11 2 R 11 2 3 Gas control valv...

Page 104: ...Fig Dimensions BFC 80 100 120 104 Installation Maintenance and Service part ...

Page 105: ... temperature nominal load ºC 44 54 63 68 Gas category 3P G31 Diameter of the venturi restrictor mm 6 00 6 00 6 00 6 00 Nominal Load gross kW 31 5 32 6 51 1 62 0 Nominal output kW 31 0 32 7 50 3 60 4 Supply pressure mbar 37 50 37 50 37 50 37 50 Gas control valve pressure mbar 12 0 2 0 12 0 2 0 12 0 2 0 12 0 2 0 CO2 full load vol 10 0 1 0 10 0 1 0 10 0 1 0 10 0 1 0 O2 full load vol 5 7 1 8 5 7 1 8 5...

Page 106: ...41 9 172 9 211 1 Flue gas temperature nominal load ºC 52 55 60 Gas category 3P G31 Diameter of the venturi restrictor mm 6 60 6 60 6 60 Nominal Load gross kW 84 8 103 3 126 1 Nominal output kW 84 2 100 7 121 8 Supply pressure mbar 37 50 37 50 37 50 Gas control valve pressure mbar CO2 full load vol 9 6 1 0 9 6 1 0 9 6 1 0 O2 full load vol 6 3 1 8 6 3 1 8 6 3 1 8 Gas consumption kh h 6 1 7 4 9 0 NOx...

Page 107: ...N OFF OFF 3 ON ºC ON OFF OFF 4 ON ºC ON OFF OFF 5 ON ºC ON OFF OFF 6 ON ºC ON OFF OFF 7 ON ºC ON OFF OFF 8 ON ºC ON OFF OFF 9 ON ºC ON OFF OFF 10 ON ºC ON OFF OFF 11 ON ºC ON OFF OFF 12 ON ºC ON OFF OFF 13 ON ºC ON OFF OFF 14 ON ºC ON OFF OFF 15 ON ºC ON OFF OFF 16 ON ºC ON OFF OFF 17 ON ºC ON OFF OFF 0311704_BFC_28 120_III_ENEN_V2 4 2022 10 17 107 ...

Page 108: ...18 ON ºC ON OFF OFF 19 ON ºC ON OFF OFF 20 ON ºC ON OFF OFF 21 ON ºC ON OFF OFF Example Period Day Time Tset Pump 1 ON MO 14 30 70 ºC ON OFF OFF MO 16 15 108 Installation Maintenance and Service part ...

Page 109: ...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 L N Secundair L N L N J K G H 3 1 2 4 1 2 3 4 3 1 4 2 4 2 5 1 1 3 5 2 3 3 1 2 T U J4...

Page 110: ...gnal connection A Earth J Isolating transformer JP3 Temperature sensor T2 connection N Neutral K Double pole isolator L Live input of controller L Controller O I switch JP4 Dummy connection L1 Phase input of isolating transformer primary side M Display JP5 Temperature sensor T1 connection N Fan L2 Phase input of isolating transformer secondary side O Temperature sensor T2 bottom of tank JP6 Select...

Page 111: ...XTRA 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 0311704_BFC_28 120_III_ENEN_V2 4 2022 10 17 111 ...

Page 112: ...12 7 Declaration of conformity 112 Installation Maintenance and Service part ...

Page 113: ......

Page 114: ......

Page 115: ...A O Smith installation instructions for the specific model and the relevant government and local authority installation and building codes rules and regulations in force at the time of installation The water heater remains installed at the original site of installation The water heater is used exclusively with drinking water which at all times can freely circulate a separately installed heat excha...

Page 116: ...arehouse 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 Article 6 Claims A claim on grounds of the specified warranty must be submitted to the dealer from whom the water heater was purchased or to another authorised dealer for A O Smith Water Products Company products Inspection...

Page 117: ...Index A About this manual 7 Appendices 97 C Copyright 3 I Installation 53 P Preface 3 T Trademark 3 Troubleshooting 89 0311704_BFC_28 120_III_ENEN_V2 4 2022 10 17 115 ...

Page 118: ...116 Installation Maintenance and Service part ...

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