A.O. Smith BFC Cyclone Installation, User And Service Manual
  1. Manuals
  2. Brands
  3. A.O. Smith Manuals
  4. Water Heater
  5. BFC Cyclone
  6. Installation, user and service manual

A.O. Smith BFC Cyclone Installation, User And Service Manual

High efficient condensing water heater
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
BFC Cyclone
High Efficient Condensing
Water Heater
BFC 28/30/50/60/80/100/120
Installation, User and Service Manual

Advertisement

Table of Contents
loading

Related Manuals for A.O. Smith BFC Cyclone

Summary of Contents for A.O. Smith BFC Cyclone

  • Page 1 BFC Cyclone High Efficient Condensing Water Heater BFC 28/30/50/60/80/100/120 Installation, User and Service Manual...
  • Page 2 Data is subject to change. A.O. Smith Water Heaters A.O. Smith Europe Unit B7-B8 Armstong Mall De Run 5305 T : 0870 267 6484 Southwood Business Park PO Box 70 sales@aosmith.co.uk Farnborough Hampshire 5500 AB Veldhoven www.aosmith.co.uk GU14 ONR UK...

  • Page 3: Preface

    Nothing from this publication may be copied, reproduced and/or published by means of printing, photocopying or by whatsoever means, without the prior written approval of A.O. Smith Water Products Company. A.O. Smith Water Products Company reserves the right to modify specifications in this manual. Trademarks Brand names in this manual are registered trademarks of their respective owners.

  • Page 4: Regulations

    Regulations Gas Safety (installations and Use) Regulations 1998 (as amended). It is law that all gas appliances are installed by competent persons, in accordance with the above regulations. Failure to install appliances correctly could lead to prosecution. It is in your own interest and that of safety, to ensure that this law is complied with.

  • Page 5: Contact Information

    Contact information If you have any comments or questions, please contact: A.O. Smith Water Products Company Adress: PO Box 70 5500 AB Veldhoven The Netherlands Telephone: 0870 - AOSMITH (free) 0870 - 267 64 84 General: +31 40 294 25 00...

  • Page 7: About This Manual

    About this manual Scope This manual gives information about safe and correct use of the water heater and how installation, maintenance and service activities have to be done correctly. You must obey the instructions in this manual. Caution Read this manual carefully before you start the water heater. It can cause personal injury and damage to the water heater when you do not read the manual and/or do not obey the instructions.

  • Page 8: Document Identification

    This manual contains the following text styles/symbols for situations that may endanger users/engineers, cause damage to equipment or need 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.

  • Page 9: Table Of Contents

    Table of Contents Preface..................3 Copyright................3 Trademarks............... 3 Warranty................3 Liability................3 Compliance............... 3 Regulations............... 4 Contact information............5 About this manual............... 7 Scope................7 Target group..............7 Notation conventions............7 Document identification............8 User part..............13 Introduction................15 Safety..................17 Interface................... 19 Operator interface............
  • Page 10 4.1.1 The appliance's heating cycle..........25 Turn off the water heater...........27 4.2.1 Turn off for a short period..........27 4.2.2 Isolate from the mains............28 4.2.3 Turn off for a long period........... 28 Main menu..............29 4.3.1 Notation conventions for menu-related instructions....29 4.3.2 Switching to ON mode............30 4.3.3...
  • Page 11 7.2.4 Working clearances............54 Installation diagram............55 Water connections............56 7.4.1 Unvented water connections..........56 7.4.2 Vented water connections..........57 Gas connection..............58 Venting system..............58 7.6.1 C13/C33 concentric systems..........60 7.6.2 C13/C33 parallel systems..........62 7.6.3 C43/C53/C63 systems............64 Electrical connections............65 7.7.1 Preparation..............65 7.7.2...
  • Page 12 10.1 Preparation..............85 10.2 Water-side maintenance............ 86 10.2.1 Descale the tank.............. 86 10.2.2 Clean the condensate drain..........87 10.3 Gas-side maintenance............87 10.3.1 Clean the burner.............. 87 10.3.2 Clean the heat exchanger..........87 10.4 Finalization..............88 Troubleshooting................ 89 11.1 Errors and warnings............89 11.1.1 General errors..............90 11.1.2 Displayed errors...............

  • Page 13: User Part

    User part 0311704_BFC_28-120_III_ENEN_V2.4, 2022-10-17...

  • Page 15: Introduction

    Introduction The BFC water heater stores and heats water for sanitary purposes. Cold water enters the bottom of the tank through 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.
  • Page 16 User part...

  • Page 17: Safety

    Safety A.O. Smith cannot be held responsible for damages or injuries leading back to: • Failure to follow the instructions provided in this manual. • Carelessness during use or maintenance of the water heater. Every user has to study the user part of this manual and has to follow the instructions in this part of the manual strictly.
  • Page 18 User part...

  • Page 19: Interface

    Interface Operator interface The operator interface is completely menu-driven, and comprises: • a 4-line display with 20 characters per line; • 6 buttons for controlling the water heater (below the display); • 6 graphical symbols (above the display); • a connector for a service PC; •...

  • Page 20: Control Switch

    [RESET] is also used to reset the water heater following an error. PC connection The PC connection is exclusively intended to enable technicians from A.O. Smith to read the status and history of the water heater. These details can be important for troubleshooting and/or resolving complaints.

  • Page 21: Status Of The Water Heater

    Status of the water heater During operation, the display shows the status of the water heater. 3.6.1 Operating modes When running, the water heater has four basic operating modes, namely: • OFF (see section 3.6.1.1) • ON (see section 3.6.1.2) •...

  • Page 22: Error Conditions

    3.6.1.4 PROG In this mode a preset week program is active, and the water heater responds continually to demand within the time periods set in the week program. There are two distinct situations possible in this mode: The current time falls within a set time period of the week program. The figure shows the display with the following information: line one: the text PROG;...

  • Page 23: Service Conditions

    3.6.3 Service conditions The figure shows the message SERVICE REQUIRED. If this message appears, the water heater needs a service and maintenance inspection. In this case, contact your service and maintenance engineer. Note Regular maintenance extends the service life of the water heater. Note The message SERVICE REQUIRED is based on the number of expired burning hours and the preset service interval.
  • Page 24 User part...

  • Page 25: Use

    Turn on the water heater Start the water heater as follows: Fill the water heater (see section 7.8.1). Open the manual gas valve (see section 7.3). Switch on the power to the water heater using the isolator between the water heater and the power supply.
  • Page 26 Once demand is registered, the fan is started to vent any gases that may be present. This phase is called pre-purge and lasts about 15 seconds. The icon is activated. The message PRE PURGE appears. During the pre-purge, the pressure switch closes. The icon is activated.

  • Page 27: Turn Off The Water Heater

    Following the post-purge, the fan stops and the pressure switch opens: The icons are dimmed. The message POST PURGE vanishes. With any subsequent heat demand, the heating cycle will resume from step 1. Turn off the water heater 4.2.1 Turn off for a short period To decommission the water heater for a short period, you must activate the frost protection.

  • Page 28: Isolate From The Mains

    4.2.2 Isolate from the mains The water heater may only be isolated from mains power in the correct way. The correct procedure is as follows: Activate the MENU with [ Position the cursor in front of OFF. Confirm OFF with [ENTER]. Caution Failure to wait until the fan stops can cause damage to the water heater.

  • Page 29: Main Menu

    Main menu The MENU is reached by pressing [ ] on the operator interface. The main menu comprises: • Select this option if you wish to turn off the water heater for a short period (see section 4.2), but do not wish to drain it. In this mode, the frost protection is active. This prevents water from freezing in the water heater.

  • Page 30: Switching To On Mode

    4.3.2 Switching to ON mode You can switch the water heater to ON mode from any operational mode, as follows: ]: ON | START OPERATION Confirm with [ENTER]. Note Also refer to the chapter on starting the water heater (see section 4.1). 4.3.3 Setting the water temperature 4.3.3.1...

  • Page 31: Starting And Stopping The Week Program

    week program and the programmed temperature. The fourth line shows the text PROGRAM ACTIVATED. The appliance's default week program switches the appliance on every day at 00:00 and off at 23:59. The default water temperature setting is 65 ºC. 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 (see section 4.1.1) and return to the week program.
  • Page 32 Example As an example, we will set the switch-on time for Sunday to 08:15 hours, and the matching switch-off time to 12:45 hours. The water temperature will be set to 75ºC and the pump will run continuously. The following settings are entered one by one using the menus: the switch-on time, the switch-off time, the desired water temperature, and the mode of the program-controlled pump.
  • Page 33 4.3.6.2 Week program: setting the switch-off time Use [ ] and [ ] to set the hours. In the example, this is 12. 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].

  • Page 34: Adding Times To A Week Program

    4.3.7 Adding times to a week program Call up the menu to INSERT switch-on and switch-off times into a week program as follows: ]: WEEK PROGRAM | PROGRAM OVERVIEW. Confirm with [ENTER]. The display shows the menu for the week program. The cursor points to the active period.

  • Page 35: Deleting Times From A Week Program

    4.3.8 Deleting times from a week program All switch-on/off times are shown sequentially in the display. Assume that the switch- on/off times for the water heater are programmed as in the figure. To delete a period, proceed as follows: ]: WEEK PROGRAM | PROGRAM OVERVIEW. Confirm with [ENTER].

  • Page 36: Extra Period

    The lines showing switch-on/off times are replaced by the text DELETE BLOCK?. See the figure. Confirm with [ENTER]. (or use [RESET] to cancel). The switching period has been deleted. You will return now to the week program menu. The cursor points to the first programmed period. Scroll with [ ] to START OPERATION.
  • Page 37 Setting the switch-on time Use [ ] and [ ] to set the day. In the example this is SU. Confirm with [ENTER]. The cursor moves to the hour digits, which will blink. Use [ ] and [ ] to set the switch-on hour to the desired value. In the example, this is 08.

  • Page 38: Settings

    The cursor moves to START. Confirm with [ENTER]. The extra period has been programmed. Note Once the extra period has completed running, the controller returns to the mode ON, OFF or WEEK PROGRAM. The following week, the extra period will NOT be automatically switched back on.
  • Page 39 4.3.10.2 Setting day and time To enter the time and day: Call up the menu for entering the day and time as follows: ]: SETTINGS. Confirm with [ENTER]. The display shows the menu for settings. Scroll with [ ] and [ ] to DAY/TIME. Confirm with [ENTER].
  • Page 40 Call up the menu to display the water heater specifications as follows: ]: SETTINGS. 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 User part...

  • Page 41: Installation, Maintenance And Service Part

    Installation, Maintenance and Service part 0311704_BFC_28-120_III_ENEN_V2.4, 2022-10-17...
  • Page 42 User part...

  • Page 43: Introduction

    Introduction About the water heater The BFC water heater is intended for heating water for sanitary purposes. The BFC is a condensing gas–fired storage water heater with a fan in the air intake. The flue gasses transfer their heat to the water through an efficient heat exchanger. The water heater has a concentric venting connector and can function as an open or as a room- sealed water heater.
  • Page 44 Fig. Water heater BFC 28, 30, 50, 60 Cover Hot water outlet Electrical connector block Controller Pressure switch Control panel Temperature sensor T Combustion chamber Anode Tank Heat exchanger Inspection and cleaning opening Temperature sensor T Cold water inlet Drain valve Gas control valve Burner Air supply hose...

  • Page 45: Operating Cycle

    Operating cycle The temperature sensor T (7) measures the water temperature at the top of the water heater (T ). This temperature is sent to the controller. As soon as T is lower than the set water temperature (T ), the controller registers a "heat demand". The fan (18) starts running and the gas control valve (16) is opened.
  • Page 46 Installation, Maintenance and Service part...

  • Page 47: Safety

    Safety Safety instructions For safety instructions about the use of the water heater, refer to Safety (see section 2) in the User part of this manual. Warning Installation, maintenance and service must be carried out by a qualified engineer in compliance with the general and local regulations imposed by the gas, water and power supply companies and the fire brigade.

  • Page 48: Instructions On The Water Heater

    Caution The anode protection remains active when the water heater is in OFF mode and the control switch is set to 0. Note Any leakage from the tank and/or connections can cause damage to the immediate environment or floors below the level of the boiler room. Install the water heater above a waste water drain or in a suitable metal leak tray.

  • Page 49: Safety Devices

    Safety devices 6.3.1 Protection for the water heater 6.3.1.1 Water temperature protection Using temperature sensors T (7) and T (13), the controller monitors three temperatures that are important for safety. The table explains the functioning of the temperature sensors. Safety Description Anti-frost The frost protection cuts in.

  • Page 50: Safety Of The Installation

    6.3.2.3 T&P valve A T&P valve is only mandatory in unvented installations. 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 51: Disposal

    6.4.2 Disposal Old end-of-life appliances contain materials that need to be recycled. When you discard devices at the end of their service life, 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.
  • Page 52 Installation, Maintenance and Service part...

  • Page 53: Installation

    For more safety instructions, refer to Safety instructions (see section 6.1). Packaging A.O. Smith recommends to unpack the water heater at or near its intended location. Remove the packaging material carefully to prevent damage to the water heater. Conditions The water heater is suitable for room-sealed and for open combustion: •...

  • Page 54: Water Composition

    7.2.3 Water composition The water must comply with the regulations for drinking water for human consumption. Water composition Hardness > 1.00 mmol/l: (alkaline earth ions) • German hardness > 5.6° dH • French hardness > 10.0° fH • English hardness > 7.0° eH •...

  • Page 55: Installation Diagram

    Installation diagram Fig. Installation diagram Pressure reducing U N V E N T E D valve (mandatory if the mains water pressure is too high) Stop valve (recommended) Non-return valve (mandatory) Circulation pump (optional) Drain valve Manual gas valve (mandatory) Service stop valve Temperature gauge (optional)

  • Page 56: Water Connections

    Note Use this installation diagram when you: • install the water connections (see section 7.4) • install the condensate drain (see section 7.4.1.4) • install the gas connection (see section 7.5) • fill the water heater (see section 7.8.1) • drain the water heater (see section 7.9.2) Water connections 7.4.1...

  • Page 57: Vented Water Connections

    7.4.1.4 Condensation drain Fit a sloping waste water pipe to the condens trap (13) for condensation drainage and connect this via an open connection to the waste water discharge. Caution If the condensation drain is not fitted to the waste water discharge using an open connection, this can cause faults.

  • Page 58: Gas Connection

    This manual does not discus installation type B23. When you need a B23 system, contact A.O. Smith for more information. Caution Always make sure that the flue gas outlet discharges into an area approved for the correct type of installation.
  • Page 59 Fig. Venting systems 0311704_BFC_28-120_III_ENEN_V2.4, 2022-10-17...

  • Page 60: C13/C33 Concentric Systems

    Diameter flue gas outlet 100 mm 130 mm Diameter air inlet 150 mm 200 mm Description parts A.O. Smith Part A.O. Smith Part number number Wall terminal set 0302504 0311465 A wall terminal (1), a 500 mm concentric pipe and a 90° bend...
  • Page 61 Fig. Example concentric venting system IMD-0791 R0 Caution During installation, obey the instructions delivered with the sets of air supply components and 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 Use a run-off of 50 mm per meter towards the water heater.

  • Page 62: C13/C33 Parallel Systems

    Material flue gas outlet Thick walled aluminum Thick walled aluminum Material air inlet Diameter flue gas outlet +0,6 +0,6 -0,6 -0,6 Diameter air inlet Description parts A.O. Smith Part A.O. Smith Part number number Wall terminal 0302505 0302313 Roof terminal 0311463 0306390...
  • Page 63 Refer to the table for the correct pipe dimensions of the C13 or a C33 parallel venting systems. Description Unit BFC 28 - 60 BFC 80 - 120 Default Diameter flue discharge/ 2x100 2x130 air inlet Maximum length air inlet Maximum length flue gas outlet 45°-bend...

  • Page 64: C43/C53/C63 Systems

    The flue gas terminal must comply to the EN 1856-1 requirements. The maximum allowable recirculation rate is 10% under wind conditions. Contact A.O. Smith for more information and/or part numbers of the C43, C53 and C63 venting systems. Concentric systems Refer to the table for the correct pipe dimensions of the C43, C53 and C63 concentric systems.

  • Page 65: Electrical Connections

    Electrical connections Warning Leave the water heater electrically isolated until you are ready to commission it. Caution The water heater is phase-sensitive. It is absolutely essential to connect the mains live (L) to the live of the water heater and the mains neutral (N) to the neutral of the water heater.

  • Page 66: Mains Power

    7.7.3.1 Isolating transformer For more information about an isolating transformer, or to order an isolating transformer, please contact A.O. Smith. 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.

  • Page 67: Commissioning

    Fit the cable in the strain relief. If you have no more connections to make: Fit the cover on the terminal block. Fit the covers onto the water heater. 7.7.3.4 Additional error signal The appliance has a relay terminal that is switched when an error is detected. This can be used to signal errors, for example with a bulb.

  • Page 68: Procedure For Checking The Supply Pressure

    The water heater is now under water supply pressure. There should now be no water coming out of the inlet combination expansion valve or (if used) out of the T&P valve (3). If there is, the cause might be: The water supply pressure is greater than the specified value (see section 12.1).
  • Page 69 BFC 80 to 120 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. IMD-1097a R0 Open the gas supply and vent the gas supply line via the test nipple.

  • Page 70: Procedure For Checking The Gas Control Valve Pressure

    Note After conversion, you must check that the gas control valve is gastight. Shut off the gas supply. Disconnect the pressure gauge and retighten the sealing screw in the test nipple. If there is nothing else you need to check or adjust, you can put the covers back on the appliance.

  • Page 71: Co 2 Adjustment

    Fig. Gas control valve pressure adjustment IMD-1096b R0 7.8.4 adjustment To check the CO value under full load and partial load and to adjust it if necessary, proceed as follows: Isolate the appliance from the power supply (see section 4.2.2). Carefully remove the covers from the appliance.
  • Page 72 BFC 28 to 60 If necessary, adjust the CO value using the adjuster screw until the value is within the range listed in the table of CO values. Use the Allen key supplied for this. The key can be found in the plastic bag that is attached to the appliance.

  • Page 73: Switching Pressure Measurement

    Compare the CO value measured against the value measured under full load. The CO value at partial load must be within ±0.3 vol% of the CO value measured or adjusted under full load. If necessary, adjust the CO value using the adjuster screw until the value is within 0.3 vol% of the CO value under full load.

  • Page 74: Turn On The Water Heater

    The electrical section is now visible. Remove the black caps from the measurement point of the pressure switch. Connect the + of the pressure gauge to the H of the measurement point of the pressure switch. Connect the - of the pressure gauge to the L of the measurement point of the pressure switch.
  • Page 75 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 position 0. Shut off the gas supply (10). Close the stop valve (11) in the hot water pipe.
  • Page 76 Installation, Maintenance and Service part...

  • Page 77: Conversion Of Gas Type

    Conversion of gas type Caution Conversion of the water heater may only be carried out by a qualified person. Use a special conversion kit to converse the water heater when: • The water heater has to operate on a different family of gases (liquid petroleum gas or natural gas).
  • Page 78 Installation, Maintenance and Service part...

  • Page 79: Settings

    Settings Operator interface The operator interface is completely menu-driven and enables the user to change settings and to verify the status and history of the water heater. For more information about how to use the operator interface, refer to Operator interface (see section 3).

  • Page 80: Display The Error History

    The standard setting for the hysteresis is 5°C. The operating cycle 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: •...

  • Page 81: Display The Selected Water Heater

    9.2.4 Display the selected water heater Call up the menu for displaying the water heater selection as follows: ]: SELECT APPLIANCE • The water heater number can be found on the rating plate. The water heater selection has been correctly preset in the factory. 9.2.5 Switch the pump on or off If a program-controlled pump (see section 7.7.3.2) is installed, it can be switched ON or...

  • Page 82: Service Mode

    9.2.7 Service mode The Installation engineer uses the SERVICE OPERATION menu to adjust the water heater setting during FULL LOAD and PARTIAL LOAD operation. Use [ ]:SERVICE OPERATION to display the SERVICE OPERATION menu. [ ] and [ ] can be used to switch between PARTIAL LOAD and FULL LOAD. If there is a heat demand, the water heater will first run through a startup cycle, then continue to operate in FULL LOAD or PARTIAL LOAD mode.

  • Page 83: Setting Legionella Prevention

    9.2.8 Setting legionella prevention To prevent infection with legionella bacteria, the water heater heats the water to 65 °C once per week, for 1 hour. This period is adjustable. By default, this period is set to Monday from 02:00 to 03:00 hours. 9.2.8.1 Switching legionella prevention on and off To switch legionella prevention on or off, select:...
  • Page 84 Installation, Maintenance and Service part...

  • Page 85: Maintenance

    On the operator interface, the maintenance interval can be set as a reminder. The display shows SERVICE REQUIRED when the pre-set interval has elapsed. To determine the correct interval, A.O. Smith recommends to do a system check on both the water and the gas side, three months after installation.

  • Page 86: Water-Side Maintenance

    The display will now show INTERNAL CHECK for about 10 seconds, and will then go to the main menu. Activate ON mode by going through the following steps: Press once on the blue arrow [ ] to position the cursor beside ON, then press [ENTER].

  • Page 87: Clean The Condensate Drain

    Fig. Cleaning opening IMD-0080 R1 Remove the cover plate (1) on the outer jacket (see the figure). Undo the bolts. Remove the cover and the gasket. Inspect the tank and remove the loose scale deposits and contamination. If the scale cannot be removed by hand, descale the water heater with a descaling agent.

  • Page 88: Finalization

    10.4 Finalization To finalize the maintenance, carry out the following steps: Fill the water heater (see section 7.8.1). Start the water heater (see section 4.1). Check the CO value (see section 7.8.4). Check the switching pressure of the pressure switch (see section 7.8.5). Erase the message SERVICE REQUIRED.

  • Page 89: Troubleshooting

    Troubleshooting 11.1 Errors and warnings The water heater can have three different kinds of errors and warnings: • General errors (see section 11.1.1), which are not displayed • Displayed errors, which are divided in two different groups: Lock out errors: when the cause is removed, you can reset the error to resume operation.

  • Page 90: General Errors

    11.1.1 General errors Note For the coding of the connections, refer to the Electrical wiring diagram. Indication Cause Measure Gas smell There is a gas leak • Close the mains gas valve at once. • Do not operate any switches. •...

  • Page 91: Displayed Errors

    Indication Cause Measure Insufficient or no hot The water heater is off. Turn on the water heater (see section 4.1). water There is no supply voltage. Make sure that: • the control switch is set to I. • the isolator is in ON position. •...
  • Page 92 Code and description Cause Measure S02 (blocking error) Sensor is not (correctly) connected Connect the sensor lead to JP5 Open circuit from sensor 1 Damaged cable and/or defective sensor Replace the cable and/or sensor of temperature sensor T at the top of tank (1).
  • Page 93 Code and description Cause Measure F02 (lock out error) Defective motor and/or rotor. • Check the motor and rotor • Replace the fan if the motor or rotor is Fan fails to run at correct defective. speed. • Reset controller Damaged wiring •...
  • Page 94 Code and description Cause Measure F04 (lock out error) No gas • Open the main gas supply valve and/or the manual gas supply valve before the Three unsuccessful gas control valve ignition attempts. • Check supply pressure to the gas control valve •...
  • Page 95 Code and description Cause Measure F11 (blocking error) Defective gas control valves See F07. Flame detection with closed gas control valve. F19 (blocking error) There is not enough supply voltage. Check that there is power to the controller Power supply voltage is The measured voltage must be 230 VAC too low.

  • Page 96: Warnings

    11.1.3 Warnings Note For the coding of the connections, refer to the Electrical wiring diagram. Indication Cause Remark Maximum burning hours: The actual burning hours have exceeded The water heater operates, but displays this Service is required the pre-set burning hours. warning.

  • Page 97: Appendices

    Appendices 12.1 Technical details Description Unit BFC 28 BFC 30 BFC 50 BFC 60 General Contents litres Empty Weight Maximum floor load Maximum operating pressure kPa (bar) 800 (8) 800 (8) 800 (8) 800 (8) (vented) Maximum operating pressure kPa (bar) 550 (5.5) 550 (5.5) 550 (5.5)
  • Page 98 Description Unit Value Maximum mains pressure of kPa (bar) 800 (8) cold water supply (vented) Maximum mains pressure of kPa (bar) 550 (5.5) cold water supply (unvented) Maximum mains pressure of kPa (bar) 500 (5) the protected cold supply setup T&P overflow pressure kPa (bar) 1000 (10)
  • Page 99 Description Unit BFC 80 BFC 100 BFC 120 General Contents litres Empty Weight Maximum floor load Maximum operating pressure kPa (bar) 800 (8) 800 (8) 800 (8) (vented) Maximum operating pressure kPa (bar) 550 (5.5) 550 (5.5) 550 (5.5) (unvented) Control thermostat - °C 40...80...
  • Page 100 Description Unit Value Maximum mains pressure of kPa (bar) 800 (8) cold water supply (vented) Maximum mains pressure of kPa (bar) 550 (5.5) cold water supply (unvented) Maximum mains pressure of kPa (bar) 500 (5) the protected cold supply setup T&P overflow pressure kPa (bar) 1000 (10)

  • Page 101: Dimensions

    12.2 Dimensions Size Description Unit BFC 28 BFC 30 BFC 50 BFC 60 Overall height 1390 1925 1925 1925 Position on pallet Appliance diameter Depth Width Diameter of flue gas 100/150 100/150 100/150 100/150 discharge Height of flue gas 1365 1890 1890 1890...
  • Page 102 Fig. Dimensions BFC 28, 30, 50, 60 Installation, Maintenance and Service part...
  • Page 103 Size Description Unit BFC 80 BFC 100 BFC 120 Overall height 2060 2060 2060 Position on pallet Appliance diameter Depth 1000 1000 1000 Width Diameter of flue gas 130/200 130/200 130/200 discharge Height of flue gas 1995 1995 1995 outlet/air supply x position flue gas outlet x position flue gas...
  • Page 104 Fig. Dimensions BFC 80, 100, 120 Installation, Maintenance and Service part...

  • Page 105: Gas Details

    12.3 Gas details Description Unit BFC 28 BFC 30 BFC 50 BFC 60 Gas category 2H: G20 Diameter of the venturi restrictor Nominal Load (gross) 32.2 33.3 52.2 63.3 Nominal output 31.0 32.7 50.3 60.4 Supply pressure mbar (full load) vol% 9.0 ±...
  • Page 106 Description Unit BFC 80 BFC 100 BFC 120 Gas category 2H: G20 Diameter of the venturi 8.60 8.60 8.60 restrictor Nominal Load (gross) 86.6 105.5 128.8 Nominal output 84.2 100.7 121.8 Supply pressure mbar (full load) vol% 8.9 ± 1.0 8.9 ±...

  • Page 107: Week Program Card

    12.4 Week program card You can cut the week program card out and keep it near the water heater. Period Time Pump ... ºC ON / OFF ... ºC ON / OFF ... ºC ON / OFF ... ºC ON / OFF ...
  • Page 108 ... ºC ON / OFF ... ºC ON / OFF ... ºC ON / OFF ... ºC ON / OFF Example Period Time Pump 14:30 70 ºC ON / OFF 16:15 Installation, Maintenance and Service part...

  • Page 109: Electrical Wiring Diagram

    12.5 Electrical wiring diagram X J2 J3 3 JP 2 JP 11 J2 0 JP 3 JP 4 J2 1 JP 5 J1 9 J3 5 J3 4 JP 6 J2 9 JP 8 JP 12 J3 9 J3 6 21 2 2 23 S ecund air P rim a ir...
  • Page 110 Cable colors: Components: Terminal block connections: Brown Control Power connection for controller Blue Flame probe Extra error signal connection Yelow/Green Hot surface igniter Gas control valve connection Black Gas control valve Program-controlled pump connection White Burner earth connection Grey/Beige External ON mode switch Fan connection Green Program-controlled pump...

  • Page 111: Menu Structure

    12.6 Menu structure CONTROL SERVICE MAIN MENU PROGRAM HYSTERESE HYSTERESE DOWN HYSTERESE UP START OPERATION HISTORY CHANGE SETPOINT OF ERRORS APPLIANCE WEEK- HISTORY PROGRAMMA START OPERATION SELECT APPLIANCE PROGRAM OVERVIEW PUMP RELAY EXTRA PERIOD SERVICE INTERVAL SETTINGS SERVICE OPERATION LANGUAGE FULL LOAD DAY/TIME PARTIAL LOAD...

  • Page 112: Declaration Of Conformity

    12.7 Declaration of conformity Installation, Maintenance and Service part...

  • Page 115: Index

    Article 2: Tank warranty If, after inspection and at the sole discretion of A.O. Smith, the glass-lined steel tank of a water heater supplied by A.O. Smith proves within 3 (three) years of the original installation date to be leaking due to rust or corrosion occurring on the water side, then A.O.
  • Page 116 (assemblies or parts of) water heaters supplied for replacement, other than the warranty expressly set out in these Articles. Under the terms of the supplied warranty, A.O. Smith is not liable for damage to persons or property caused by (assemblies or parts, or the glass-lined steel tank of) a (replacement) water heater that it has supplied.
  • Page 117 Index About this manual....... 7 Appendices........97 Copyright........... 3 Installation........53 Preface..........3 Trademark......... 3 Troubleshooting........ 89 0311704_BFC_28-120_III_ENEN_V2.4, 2022-10-17...
  • Page 118 Installation, Maintenance and Service part...

This manual is also suitable for:

Bfc 28Bfc 30Bfc 50Bfc 60Bfc 80Bfc 100 ... Show all

Table of Contents