A.O. Smith BFC-28 Installation, User And Service Manual
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A.O. Smith BFC-28 Installation, User And Service Manual

High efficient condensing water heater
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See also: Installation and Servicing Manual
BFC
High Efficient Condensing
Water Heater
BFC - 28/30/50/60/80/100/120
0310 878
Installation, User and Service
Manual
Innovation has a name.

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Summary of Contents for A.O. Smith BFC-28

  • Page 1 High Efficient Condensing Water Heater BFC - 28/30/50/60/80/100/120 0310 878 Installation, User and Service Manual Innovation has a name.
  • 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.
  • Page 3 Errata The amendments below apply to finishing of maintenance (15.5 "Finalizing maintenance").These instructions supersede the previous instructions of the solar heating control. 15.5 Finalizing To finalize the maintenance, carry out the following steps: maintenance 1. Fill the water heater (5 "Filling"). 2.
  • Page 5 If you have any comments or queries concerning specific aspects related to the water heater, then please do not hesitate to contact: A.O.Smith Water Products Company PO Box 70 5500 AB Veldhoven The Netherlands Telephone: (free) 0870-AOSMITH 0870-2676484 General: +31 40 294 25 00 Fax: +31 40 294 25 39 E-mail: info@aosmith.nl...
  • Page 6 Instruction manual BFC...

  • Page 7: Table Of Contents

    Contents Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - 9 About the water heater - - - - - - - - - - - - - - - - - - - - - - - - - - - 9 What to do if you smell gas- - - - - - - - - - - - - - - - - - - - - - - - - 9 Regulations - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 9 Target groups - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 10...
  • Page 8 Contents Status of the water heater - - - - - - - - - - - - - - - - - - - 53 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 53 Operating modes - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 53 Error conditions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 54 Service condition - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 54...
  • Page 9 Performing maintenance - - - - - - - - - - - - - - - - - - - - 87 15.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 87 15.2 Preparation for maintenance - - - - - - - - - - - - - - - - - - - - - - - 87 15.3...
  • Page 10 Contents Instruction manual BFC...

  • Page 11: Introduction

    Introduction About the water This manual describes how to install, service and use the BFC water heater. The BFC water heater is a condensing water heater with a fan in the air intake. heater The BFC can be installed as either an open or room-sealed water heater. A concentric chimney connector is fitted standard to the water heater.

  • Page 12: Target Groups

    Introduction British and European Standards • BS 6891: Installation of low pressure gas pipework of up to 35 mm (R1¼) in domestic premises (2nd family gas) - Specification. Note: for lager installations see IGE/UP/2 below. • BS 6798: Specification for installation and maintenance of gas-fired boilers of rated input not exceeding 70 kW net.

  • Page 13: Maintenance

    Target group symbols Symbol Target Group (End) user Installation engineer Service and maintenance engineer Caution This water heater is not intended for use by persons with reduced physical, sensory or mental capacities, or who lack the necessary experience or knowledge, unless the person responsible for their safety is supervising them or has explained to them how the water heater should be used.

  • Page 14: Overview Of This Document

    Introduction Overview of this The table provides an overview of the contents of this document. document Contents of this document Chapter Target groups Description Working principle of the water This chapter describes the working principle of the heater appliance. Installation This chapter describes the installation activity to be completed before you start the appliance for the first time.

  • Page 15: Working Principle Of The Water Heater

    Working principle of the water heater Introduction This chapter covers the following topics: • General working principle of the water heater; • Water heater operating cycle; • Protection for the water heater; • Safety of the installation. General working The water heater is fitted with a modulating premix burner system with 1:1 gas- to-air ratio regulation.
  • Page 16 Cut-away view of the water heater Legend BFC 28, 30, 50, 60 BFC 80, 100, 120 Unused numbers are not applicable 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...

  • Page 17: Water Heater Operating Cycle

    Water heater 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 operating cycle lower than the set water temperature (T ), the controller registers a "heat demand".

  • Page 18: Safety Of The Installation

    Working principle of the water heater 2.4.5 Pressure switch The pressure switch only guarantees the supply of air during pre-purging of the water heater. If the pressure difference during pre-purging is sufficient, the pressure switch closes. The table (3.4.2 "General and electrical specifications") shows the trip point for each water heater.

  • Page 19: Installation

    Installation Warning The installation must be carried out by an approved installation engineer in compliance with the general and local regulations imposed by the gas, water and power supply companies and the fire brigade. The appliance may only be installed in a room that complies with the requirements stated in national and local ventilation regulations (1.3 "Regulations").
  • Page 20 Installation 3.3.1 Air humidity and ambient temperature The boiler room must be frost-free, or be protected against frost. The table shows the ambient conditions that must be adhered to for correct functioning of the electronics present in the appliance to be guaranteed. Air humidity and ambient temperature specifications Air humidity and ambient temperature Air humidity...

  • Page 21: Technical Specifications

    Working clearances IMD-0765 R0 BFC 28 thru 60 BFC 80 thru 120 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 the level of the boiler room. If this is the case, the water heater should be installed above a waste water drain or in a suitable metal leak tray.
  • Page 22 3.4.1 Dimensions of the water heater Top and front view of the appliance Legend BFC 28, 30, 50, 60 BFC 80, 100, 120 See the table.
  • Page 23 Dimensions (all dimensions in mm, unless otherwise stated) Size Description Unit BFC 28 BFC 30 BFC 50 BFC 60 BFC 80 BFC 100 BFC 120 Overall height 1390 1910 1910 1910 2060 2060 2060 Position on pallet Appliance diameter Depth 1000 1000 1000...
  • Page 24 3.4.2 General and electrical specifications DESCRIPTION Unit BFC 28 BFC 30 BFC 50 BFC 60 BFC 80 BFC 100 BFC 120 Contents litres Empty weight Maximum floor load Maximum operating pressure (vented) kPa (bar) 800 (8) 800 (8) 800 (8) 800 (8) 800 (8) 800 (8)
  • Page 25 DESCRIPTION Unit Value Maximum mains pressure of cold water supply (vented) kPa (bar) 800 (8) Maximum mains pressure of cold water supply kPa (bar) 550 (5,5) (unvented) Maximum mains pressure of the protected cold supply kPa (bar) 500 (5) setup T&P overflow pressure kPa (bar) 700 (7)
  • Page 26 3.4.3 Gas data description Unit BFC 28 BFC 30 BFC 50 BFC 60 BFC 80 BFC 100 BFC 120 2H3P Gas category 2H: G20 - 20 mbar Diameter of the venturi restrictor 8,60 8,60 8,60 32,2 33,3 52,2 63,3 86,6 105,5 128,8 Nominal load (gross)

  • Page 27: Installation Diagram

    Installation diagram The figure shows the Installation diagram. This diagram is referred to in the sections describing the actual connection procedure. Installation diagram Legend Vented and unvented UNVENTED Unused numbers are not applicable pressure relief valve (mandatory if the mains water pressure is too high) T&P valve (mandatory) stop valve (recommended)

  • Page 28: Unvented Water Connections

    Installation Unvented water Warning The installation should be carried out by a competent person, in compliance connections with general and locally applicable regulations (1.3 "Regulations"). 3.6.1 Cold water side See (A) in the installation diagram (3.5 "Installation diagram"). 1. Fit an approved stop valve (4) on the cold water side as required by the applicable regulations (1.3 "Regulations").

  • Page 29: Vented Water Connections

    Vented water Warning The installation should be carried out by a competent person, in compliance connections with general and locally applicable regulations (1.3 "Regulations"). 3.7.1 Cold water side See (A) in the installation diagram (3.5 "Installation diagram"). 1. Fit an approved stop valve (4) on the cold water side between the cold water head tank (18) and the water heater, as required by applicable regulations.

  • Page 30: Air Supply And Chimney Flue Discharge

    Installation See (D) in the installation diagram (3.5 "Installation diagram"). 1. Fit a manual gas valve (10) in the gas supply pipe. 2. Blow the gas pipe clean before use. 3. Close the manual gas valve. 4. Fit the gas supply pipe to the gas control valve. Warning After fitting, check for leaks.
  • Page 31 Installation types IMD-0789 R0 Instruction manual BFC...
  • Page 32 Installation Explanation of types of installation Installation type Description Air for combustion is drawn from the boiler room. Concentric and/or parallel wall flue terminal. Concentric and / or parallel roof flue terminal Water heaters on common air supply and flue gas discharge (concentric and/or parallel) in multi-storey building.

  • Page 33: Specifications

    Water heater with concentric flue gas discharge material IMD-0791 R0 According to the table, the maximum length allowed is 40 metres, and there may be up to seven 90 degree bends. Both requirements are fulfilled. Specifications Caution For type C13 and C33 installations,A.O.Smith prescribes the use of a roof or wall flue terminal, exclusively of a type approved for the water heater.
  • Page 34 Installation Concentric roof flue terminal specifications C33 Subject Description Roof conduit set: Art. No. BFC 28, 30, 50, 60 0304 423 • 1x roof conduit BFC 80, 100, 120 0306 855 (incl. clamping ring) Manufacturer Muelink & Grol 1x pipe 1000 mm •...

  • Page 35: Electrical Connection

    Practical example of parallel flue gas discharge Example The figure shows a BFC 30 installation. This has to be fitted with a 10 m parallel pipe of 100 mm diameter, and eight 90 degree bends. The configuration must be checked for compliance with the requirements stated in the table. Appliance with parallel flue gas discharge material The longest pipe must be used to check the maximum length.
  • Page 36 Installation 3.10.2 Preparation 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. Caution There must be no potential difference between neutral (N) and earth ( ). If this is the case, then an isolating transformer (3.10.4 "Isolating transformer") must be used in the supply circuit.

  • Page 37: Isolating Transformer

    Terminal block Isolating transformer Program- Mains External Alarm Out controlled voltage ON/OFF link primary secondary pump 16 to 20 3.10.3 Connecting the mains power The water heater is supplied without a power cable and isolator. Note In order to receive electrical power, the water heater has to be connected to the mains power by means of a permanent electrical connection.

  • Page 38: Check The Supply Pressure, Gas Controller Pressure, Co 2 Value And Switching Pressure

    Installation 3.10.5 Connecting a program-controlled pump Note The maximum power capacity for a pump regulated by the controller is 100W. 1. Connect neutral (N), live (L) and earth ( ) to terminals 13, 14 and 15 as indicated in the table (3.10.2 "Preparation"). 2.
  • Page 39 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.
  • Page 40 Installation 7. Connect a pressure gauge to the test nipple as soon as gas starts to flow from it. 8. Switch on the power to the appliance using the isolator on the appliance. 9. 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.
  • Page 41 3. The electrical section is now visible. 4. The gas control valve has a test nipple that can be used for measuring the gas control valve 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.
  • Page 42 Installation Gas control valve pressure adjustment IMD-1096b R0 3.11.3 adjustment To check the CO value under full load and partial load and to adjust it if necessary, proceed as follows: 1. Isolate (10.3 "Isolating the water heater from the mains") the appliance from the power supply.
  • Page 43 12. Then compare the measured CO value against the value from the table (3.4.3 "Gas data"). Caution The CO value at full load must be within ±1.0 vol% of the CO value stated in the table (3.4.3 "Gas data"). BFC 28 to 60 13.
  • Page 44 Installation Partial load measurement 19. From the service menu, select: SERVICE OPERATION | PARTIAL LOAD Confirm with The appliance is now in "PARTIAL LOAD" mode and will ignite. SERVICE Ê Ê PARTIAL LOAD 65ÉC Tset 70ÉC RUNNING 20. The appliance is now running at PARTIAL LOAD. Read the value from the meter and wait until this measured value has remained stable for some time.
  • Page 45 BFC 80 t/m 120 - CO adjustment (partial load) IMD-1097b R0 Note Turning to the left (anticlockwise) means more less (lower CO level) and turning to the right (clockwise) means more gas (higher CO level). Note After conversion, you must check that the gas control valve is gastight. 23.
  • Page 46 Installation 10. Read the pressure from the meter at the moment when the appliance switches from PRE PURGE to PRESSURE SWITCH. At this point, the appliance's display will show: Ê Ê Ê 13:45 Thursday 63ÉC Tset 65ÉC PRESSURE SWITCH 11. Check whether the measured value matches the value from the table (3.4.3 "Gas data").

  • Page 47: Conversion To A Different Gas Category

    Conversion to a different gas category Introduction Caution The conversion may only by carried out by a competent person. If the appliance has to operate on a different family of gases (liquid petroleum gas or natural gas) or gas category other than that for which the appliance has been configured at the factory, then the appliance will have be adapted using a special conversion kit.
  • Page 48 Conversion to a different gas category Instruction manual BFC...

  • Page 49: Filling

    Filling Installation diagram Legend Vented and unvented UNVENTED Unused numbers are not applicable pressure relief valve (mandatory if the mains water pressure is too high) T&P valve (mandatory) stop valve (recommended) non-return valve (mandatory) circulation pump (optional) drain valve manual gas valve (mandatory) service stop valve temperature gauge (optional)

  • Page 50: Filling Unvented Installations

    Filling Filling unvented To fill the water heater, proceed as follows: installations 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.

  • Page 51: Draining

    Draining Installation diagram Legend Vented and unvented UNVENTED Unused numbers are not applicable pressure relief valve (mandatory if the mains water pressure is too high) T&P valve (mandatory) stop valve (recommended) non-return valve (mandatory) circulation pump (optional) drain valve manual gas valve (mandatory) service stop valve temperature gauge (optional)

  • Page 52: Draining Unvented Installations

    Draining Draining unvented Some service activities require the water heater to be drained. The procedure is as follows: installations 1. Activate the MENU with MENU »OFF ^ ON È WEEK PROGRAM 2. Position the cursor in front of OFF. 3. Confirm OFF with 4.

  • Page 53: The Control Panel

    The control panel Introduction Explanation of icons This chapter covers the following topics: The table explains the meanings of the icons. • Control; Icons and their meaning • Explanation of icons; Name Explanation • ON/OFF switch on controller; • Navigation buttons; Heat demand Heat demand detected •...

  • Page 54: Pc Connection

    The control panel The arrows ^ and È indicate that you can scroll up and/or down. Use the buttons to scroll. MENU ^»ON È WEEK PROGRAM EXTRA PERIOD SETTINGS The cursor » points to the option to be activated. In the display as shown in the figure, you can scroll through the main menu.

  • Page 55: Status Of The Water Heater

    Status of the water heater Introduction 8.2.3 EXTRA This chapter covers the following topics: In this mode, one extra period is programmed and activated. In this mode, the OFF orPROG mode is • Operating modes; temporarily overruled to fulfil a single period of •...

  • Page 56: Error Conditions

    Status of the water heater 8.2.4 • line one: error code comprising a letter and two PROG digits, followed by the error description; In this mode a preset week program is active, and the • lines two to four: alternately, a brief explanation of water heater responds continually to demand within the error, and a brief action to resolve the error.

  • Page 57: Anode Warning

    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. WARNING POWER ANODE MALFUNCTION Note The water heater continues to function when this message appears. Instruction manual BFC...
  • Page 58 Status of the water heater Instruction manual BFC...

  • Page 59: Starting The Water Heater

    Starting the water heater Introduction 6. Confirm the selection START OPERATION with This chapter covers the following topics: The appliance is now in "ON mode". If there is a • Starting the appliance. heat demand, the appliance will run through the •...
  • Page 60 Starting the water heater When the water heater starts, it will run through the 5. After a number of seconds pre-glow, the gas following steps: control valve is opened and ignition takes place. 1. The water temperature drops below the set The icon is activated.

  • Page 61: Shutting Down

    Shutting down 10.1 Introduction 10.3 Isolating the water heater from the mains This chapter describes: The water heater may only be isolated from mains • Decommissioning the water heater for a short power in the correct way. The correct procedure is as period.
  • Page 62 Shutting down Instruction manual BFC...

  • Page 63: Main Menu

    Main menu 11.1 Introduction 11.2 Notation convention for menu-related instructions The MENU is reached by pressing the button on the controller. The MENU ( ) of the controller is divided into sub- menus. For example, SETTINGS is one of the MENU functions reached from the main menu.

  • Page 64: Week Program

    Main menu 2. Use: If the water temperature becomes too low while the week program is running, the appliance will run • to increase the value; through the heating cycle (9.3 "The appliance's • to decrease the value. heating cycle") and return to the week program. •...
  • Page 65 The display shows the menu for the week program, Confirm with see the figure below. With the default setting, the The cursor moves to the minute digits, which will program switches on and off every day at 00:00 and blink. 23:59 respectively, the water temperature is 65ºC and the pump is switched on (P).

  • Page 66: Adding Times To A Week Program

    Main menu 11.7.3 Week program: setting the water 11.8 Adding times to a week program temperature Call up the menu to INSERT switch-on and switch-off times into a week program as follows: 1. Use to set the water temperature. In the example this is 75°C.

  • Page 67: Deleting Times From A Week Program

    3. Proceed as follows: To warn you that you are now working in the delete sub-menu, the cursor is replaced with an a. Set the switch-on time (11.7.1 "Week program: exclamation mark (!) and the period settings will setting the switch-on time"). blink.

  • Page 68: Extra Period

    Main menu 6. Scroll with to START OPERATION. The cursor moves to the minute digits, which will blink. Confirm with The week program is active. SU 08»00 SU 08:00 11.10 Extra period Tset 65ÉC PUMP ON START Use an extra period when you either want to have the water heater switch on and off for a certain period, either without modifying the active week program, or Note...

  • Page 69: Settings

    Setting the program-controlled pump 3. The cursor is positioned beside LANGUAGE 1. If required, a pump can be controlled during the Confirm with period. Use to set PUMP ON. The pump The display shows the language selection menu. ensures a regular circulation of hot water in the hot water pipes.
  • Page 70 Main menu 4. The cursor is positioned beside Sunday. 2. Scroll with to SPECIFICATIONS Scroll with to the desired day. Confirm with Confirm with SETTINGS The day has been set. The display shows the sub- LANGUAGE menu for adjusting the time. ^ DAY/TIME È»SPECIFICATIONS TIME...

  • Page 71: Service Program

    Service program 12.1 Introduction Set the hysteresis as follows: • : HYSTERESIS UP The service program is used by the installation engineer or service and maintenance engineer for: The figure shows an example • Displaying the water heater history; Set the hysteresis as follows •...

  • Page 72: Display The Selected Water Heater

    Service program Call up the menu for displaying the water heater 12.7 Setting the service interval history as follows: The service interval is a feature of the controller to help • : APPLIANCE HISTORY the service and maintenance engineer set the frequency of maintenance (14.2 "Determining service The figure shows an example.

  • Page 73: Setting Legionella Prevention

    Temporarily raising the setpoint during 12.9.1 Switching legionella prevention on FULL and off LOAD PARTIAL LOAD :>:SERVICE OPERATION. To switch legionella prevention on or off, select: • : ANTI LEGIONELLA SERVICE OPERATION »FULL LOAD ANTI LEGIONELLA PARTIAL LOAD »YES 2. Select FULL LOAD or PARTIAL LOAD. The example below describes the situation for •...
  • Page 74 Service program Instruction manual BFC...

  • Page 75: Errors

    Errors 13.1 Introduction A distinction is made between: • General errors General errors are not reported on the display. General errors are: Gas smell Display does not light up Insufficient or no hot water. Water leakage Explosive ignition. The manual includes (13.2 "Troubleshooting table for general errors") a table with general errors.

  • Page 76: Troubleshooting Table For General Errors

    13.2 Troubleshooting table for general errors Warning Maintenance may only be performed by a qualified service and maintenance engineer. General errors Indication Cause Measure Remark Gas smell Gas leak Warning Warning Close the main gas valve at once. Immediately contact your installation engineer or local gas company.
  • Page 77 Indication Cause Measure Remark Water leakage Leakage from a water Tighten the threaded connection If the leak persists, consult your installation engineer connection (threaded) Condensate leakage Check that the condensation water discharge is working properly. Rectify if necessary Leakage from another Trace the leak nearby water water heater or pipe segment...

  • Page 78: Troubleshooting Table For Displayed Errors

    13.3 Troubleshooting table for displayed errors Displayed errors Code + description Cause Measure Remark S01 (blocking error) Sensor is not (correctly) Connect the sensor lead to JP3 See the electrical diagram (17 "Appendices"). connected Open circuit from Damaged cable and/or Replace the cable and/or sensor.
  • Page 79 Code + description Cause Measure Remark S11 (blocking error) Short circuit in sensor Replace the cable and/or sensor. To replace the necessary parts, you must contact your installation circuit engineer Short circuit in temperature sensor T at the bottom of the tank.
  • Page 80 Code + description Cause Measure Remark F01 (blocking error) Live and neutral Be sure to connect the live and neutral correctly (3.10 "Electrical See the electrical diagram (17 "Appendices"). connected wrong way connection"); the water heater is phase-sensitive around. Defect in power supply circuit Condensation on the 1.
  • Page 81 Code + description Cause Measure Remark F03 (lock out error) Damaged wiring/Open 1. Check the wiring between the pressure switch and the If the error cannot be resolved or is persistent, contact your circuit installation engineer controller The pressure switch To replace the necessary parts, you must contact your installation 2.
  • Page 82 Code + description Cause Measure Remark F04 (lock out error) No gas 1. Open the main gas supply valve and/or the manual gas supply To restore the gas supply, contact your installation engineer valve before the gas control valve Three unsuccessful 2.
  • Page 83 Code + description Cause Measure Remark F06 (blocking error) Damaged cable in Check the wiring and the flame probe. Replace the wiring and/or If the error persists, contact your installation engineer. contact with metal flame probe if necessary. To replace the necessary parts, you must contact your installation surface or bent flame Short circuit between engineer...
  • Page 84 Code + description Cause Measure Remark C02 (lock out error) Incorrect reference 1. Reset controller. To replace the necessary parts, you must contact your installation voltage from the AD engineer 2. Check that the frequency of the power supply is converter.
  • Page 85 Code + description Cause Measure Remark E01 (blocking error) The temperature of the None. This is a temporary message that may appear from time to water at the top of the time, but will disappear automatically. tank is >88 The temperature protection at the top of the tank has been activated.

  • Page 86: Warnings On The Display

    13.4 Warnings on the display Warnings on the display Indication Cause Measure Remark Maximum burning The actual burning Water heater runs, but displays a warning For maintenance to your water heater, please contact your hours: Service hours have exceeded installation engineer. required.

  • Page 87: Service Interval

    Service interval 14.1 Introduction A service should be carried out at least once a year, both on the water side and on the gas side. Among other things, the service interval depends on the water quality, the average burning time per day and the set water temperature. Note Regular maintenance extends the service life of the water heater.
  • Page 88 Service interval Instruction manual BFC...

  • Page 89: Performing Maintenance

    Performing maintenance 15.1 Introduction Caution Maintenance may only by carried out by an approved service and maintenance engineer. At each service, the water heater undergoes maintenance on both the water side and the gas side. The maintenance must be carried out in the following order.

  • Page 90: Water-Side Maintenance

    Performing maintenance 6. Switch the controller ON by setting the ON/OFF switch to position I. INTERNAL CHECK The display will now show INTERNAL CHECK for about 10 seconds, and will then go to the main menu. MENU »OFF ^ ON È...

  • Page 91: Gas-Side Maintenance

    Take the rate of scale formation into account when deciding on the service interval. Scale formation depends on the local water composition, the water consumption and the water temperature setting. A water temperature setting of maximum 60°C is recommended for the prevention of excessive scale build-up. To guarantee a good, watertight seal around the cleaning opening, replace the gasket, washers, bolts and, if necessary, the lid with new parts before reassembly (see the figure).

  • Page 92: Finalizing Maintenance

    Performing maintenance 15.4.3 Clean heat exchanger 1. Detach the burner. 2. Clean the combustion chamber of the heat exchanger using a vacuum cleaner and a soft brush. 3. Detach the chimney flue. 4. Clean the end of the heat exchanger using tap water. 5.

  • Page 93: Warranty (Certificate)

    Warranty (certificate) To register your warranty, you should complete and return the enclosed warranty card, after which a warranty certificate will be sent to you. This certificate gives the owner of an appliance supplied by A.O.Smith Water Products Company B.V. of Veldhoven, Netherlands (hereinafter "A.O.Smith") the right to the warranty set out below, defining the commitments of A.O.Smith to the owner.

  • Page 94: Exclusions

    Warranty (certificate) The water heater is at all times fitted with cathodic protection. If sacrificial anodes are used for this, these must be replaced and renewed when, and as soon as, they are 60% or more consumed. When power anodes are used, it is important to ensure that they continue to work properly.

  • Page 95: Appendices

    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") Instruction manual BFC...

  • Page 96: Menu Structure

    Appendices 17.2 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...
  • Page 97 Instruction manual BFC...

  • Page 98: Electrical Diagram

    Appendices 17.3 Electrical diagram Electrical diagram X J2 JP11 JP12 21 22 23 Primair Secundair 0309 361 R0 230VAC 50Hz 1 = brown, 2 = blue, 3 = geel / green, 4 = black, 5 = white, 6 = grey / beige, 7 = green Instruction manual BFC...
  • Page 99 TERMINAL BLOCK CONNECTIONS: CONTROLLER CONNECTIONS: Earth Power connection for controller Neutral Extra error signal connection Live input of controller Gas control valve connection Program-controlled pump connection Phase input of isolating transformer (primary side) Fan connection Phase output of isolating transformer Controller display connection (secondary side) Flame probe and hot surface igniter...

  • Page 100: Declaration Of Conformity

    Appendices 17.4 Declaration of Declaration of conformity conformity Instruction manual BFC...

  • Page 101: Week Program Card

    17.5 Week program card You can cut the week program card out and keep it near the water heater. Period TIME Tset Pump Period TIME Tset Pump ..°C ON / OFF ..°C ON / OFF ..°C ON / OFF ..°C ON / OFF ..°C ON / OFF...
  • Page 102 Instruction manual BFC...
  • Page 103 Index actuation 61 join ambient conditions 17 air supply 28 ambient temperature 18 circulation pipe 26, 27 cold water side 26, 27 electrical 33 flue gas discharge 28 claims 92 gas 27 connecting the air supply 28 hot water side 26 connecting the chimney flue 28 connecting the circulation pipe 26, 27 connecting the cold water side 26, 27...
  • Page 104 Index target groups 10 warranty 91 terminal block 34 exclusions 92 ThermoControl General information 91 ON/OFF switch 51 installation and conditions of use 91 trademarks 3 scope 92 water composition 18 setting the temperature 61 user 10 water heater displaying history 69 displaying specifications 68 displaying the selection 70 protection 15...

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