A.O. Smith BFC - 80, BFC -100 User Manual

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100

Installation

User and

Service Manual

WATER PRODUCTS

COMPANY

A DIVISION OF A. O. SMITH CORPORATIONA DIVISION OF A. O. SMITH CORPORATION

A DIVISION OF A. O. SMITH CORPORATION

XTRA HIGH EFFICIENCYXTRA HIGH EFFICIENCY

www.aosmithinternational.com

your installer

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Read this manual carefully

Trademarks

Liability

Warning

Read this manual carefully before starting up the water heater. Failure to read this manual and to follow the instructions in this manual may lead to accidents, personal injury, and damage to the appliance.

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 stated in this manual.

Any brand names mentioned in this manual are registered trademarks of their respective owners.

A.O. Smith water Products Company accepts no liability for claims from third parties arising from improper use other than that stated in this manual and in accordance with the General Conditions registered at the Eindhoven Chamber of Commerce.

Refer further to the General Conditions. These are available on request, free of charge.

Although considerable care has been taken to ensure a correct and suitably comprehensive description of all relevant components, the manual may nonetheless contain errors and inaccuracies.

Should you detect any errors or inaccuracies in the manual, we would be grateful if you would inform us. This helps us to further improve our documentation.

More information

If you have any comments or queries concerning any aspect related to the appliance, then please do not hesitate to contact:

A.O. Smith water Products Company

PO Box 70

5500 AB Veldhoven

Netherlands

Telephone: (free) 0870 - AOSMITH

0870 - 267 64 84

General: +31 40 294 25 00

Fax: +31 40 294 25 39

E-mail : info@aosmith.nl

Website: www.aosmithinternational.com

In the event of problems with connecting to the gas, electricity or water supply, please contact your installation's supplier/installation engineer .

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4 Instruction manual BFC

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Table of contents

1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - 9

1.1 About the appliance - - - - - - - - - - - - - - - - - - - - - - - - - - - - 9

1.2 What to do if you smell gas- - - - - - - - - - - - - - - - - - - - - - - - - 9

1.3 Regulations - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 9

1.4 Target groups - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 10

1.5 Maintenance - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 10

1.6 Forms of notation - - - - - - - - - - - - - - - - - - - - - - - - - - - - 10

1.7 Overview of this document - - - - - - - - - - - - - - - - - - - - - - - - 11

2 Working principle of the appliance- - - - - - - - - - - - - - - 13

2.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 13

2.2 General working principle of the appliance - - - - - - - - - - - - - - - - 13

2.3 The appliance's heating cycle - - - - - - - - - - - - - - - - - - - - - - 14

2.4 Protection for the appliance - - - - - - - - - - - - - - - - - - - - - - - 14

2.5 Safety of the installation - - - - - - - - - - - - - - - - - - - - - - - - - 16

3 Installation - - - - - - - - - - - - - - - - - - - - - - - - - - - 17

3.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 17

3.2 Packaging - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 17

3.3 Environmental conditions- - - - - - - - - - - - - - - - - - - - - - - - - 17

3.4 Technical specifications - - - - - - - - - - - - - - - - - - - - - - - - - 19

3.5 Installation diagram - - - - - - - - - - - - - - - - - - - - - - - - - - - 23

3.6 Water connections, Vented- - - - - - - - - - - - - - - - - - - - - - - - 24

3.7 Water connections, Unvented - - - - - - - - - - - - - - - - - - - - - - 25

3.8 Gas connection - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 26

3.9 Air supply and flue - - - - - - - - - - - - - - - - - - - - - - - - - - - - 26

3.10 Electrical connection - - - - - - - - - - - - - - - - - - - - - - - - - - - 32

3.11 Checking the supply pressure and burner pressure - - - - - - - - - - - - 35

4 Conversion to a different gas category - - - - - - - - - - - - 39

5 Filling - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 41

5.1 Filling the appliance - - - - - - - - - - - - - - - - - - - - - - - - - - - 42

6 Draining - - - - - - - - - - - - - - - - - - - - - - - - - - - - 43

6.1 Draining unvented installations - - - - - - - - - - - - - - - - - - - - - - 44

6.2 Draining vented installations - - - - - - - - - - - - - - - - - - - - - - - 44

7 The control panel- - - - - - - - - - - - - - - - - - - - - - - - 47

7.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 47

7.2 Controls - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 47

7.3 Meaning of icons- - - - - - - - - - - - - - - - - - - - - - - - - - - - - 47

7.4 Electronic controller ON/OFF switch - - - - - - - - - - - - - - - - - - - 47

7.5 Navigation buttons - - - - - - - - - - - - - - - - - - - - - - - - - - - - 47

7.6 PC connection - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 48

8 Status of the appliance - - - - - - - - - - - - - - - - - - - - - 49

8.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 49

8.2 Operating modes - - - - - - - - - - - - - - - - - - - - - - - - - - - - 49

8.3 Error conditions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 50

8.4 Service condition- - - - - - - - - - - - - - - - - - - - - - - - - - - - - 51

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9 Starting and running - - - - - - - - - - - - - - - - - - - - - - 53

9.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 53

9.2 Starting and running- - - - - - - - - - - - - - - - - - - - - - - - - - - - 53

9.3 The appliance's heating cycle - - - - - - - - - - - - - - - - - - - - - - - 53

10 Shutting down - - - - - - - - - - - - - - - - - - - - - - - - - 55

10.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 55

10.2 Shut the appliance down for a brief period ("OFF mode") - - - - - - - - - - 55

10.3 Electrically isolating the appliance - - - - - - - - - - - - - - - - - - - - - 55

10.4 Shutting the appliance down for a long period - - - - - - - - - - - - - - - 55

11 Main menu - - - - - - - - - - - - - - - - - - - - - - - - - - - 57

11.1 Notational convention for menu-related instructions - - - - - - - - - - - - 57

11.2 Switching on the "ON mode" - - - - - - - - - - - - - - - - - - - - - - - 57

11.3 Setting the water temperature - - - - - - - - - - - - - - - - - - - - - - - 57

11.4 Week program - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 57

11.5 Starting and stopping the week program - - - - - - - - - - - - - - - - - - 58

11.6 Changing the appliance's standard week program - - - - - - - - - - - - - 58

11.7 Adding times to a week program- - - - - - - - - - - - - - - - - - - - - - 59

11.8 Deleting times from a week program- - - - - - - - - - - - - - - - - - - - 60

11.9 Extra period- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 61

11.10 Programming an extra period - - - - - - - - - - - - - - - - - - - - - - - 61

11.11 Settings- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 62

12 Service program - - - - - - - - - - - - - - - - - - - - - - - - 65

12.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 65

12.2 Setting the hysteresis - - - - - - - - - - - - - - - - - - - - - - - - - - - 65

12.3 Displaying the error history - - - - - - - - - - - - - - - - - - - - - - - - 65

12.4 Displaying the appliance history - - - - - - - - - - - - - - - - - - - - - - 66

12.5 Display the selected appliance - - - - - - - - - - - - - - - - - - - - - - 66

12.6 Switching the pump on or off - - - - - - - - - - - - - - - - - - - - - - - 66

12.7 Setting the service interval - - - - - - - - - - - - - - - - - - - - - - - - 66

12.8 Setting the display contrast - - - - - - - - - - - - - - - - - - - - - - - - 66

12.9 Setting the display backlight time - - - - - - - - - - - - - - - - - - - - - 66

12.10 Setting the display scroll speed - - - - - - - - - - - - - - - - - - - - - - 66

13 Troubleshooting - - - - - - - - - - - - - - - - - - - - - - - - 67

13.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 67

13.2 Troubleshooting table for general errors - - - - - - - - - - - - - - - - - - 68

13.3 Displayed errors - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 70

14 Maintenance frequency- - - - - - - - - - - - - - - - - - - - - 81

14.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 81

14.2 Determining service interval - - - - - - - - - - - - - - - - - - - - - - - - 81

15 Performing maintenance - - - - - - - - - - - - - - - - - - - - 83

15.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 83

15.2 Preparation for maintenance - - - - - - - - - - - - - - - - - - - - - - - 83

15.3 Water-side maintenance - - - - - - - - - - - - - - - - - - - - - - - - - 85

15.4 Gas-side maintenance - - - - - - - - - - - - - - - - - - - - - - - - - - 86

15.5 Finalizing maintenance - - - - - - - - - - - - - - - - - - - - - - - - - - 86

16 Warranty (certificate) - - - - - - - - - - - - - - - - - - - - - - 87

16.1 General warranty - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 87

16.2 Tank warranty- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 87

6 Instruction manual BFC

16.3 Conditions for Installation and use - - - - - - - - - - - - - - - - - - - - 87

16.4 Exclusions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 88

16.5 Scope of the warranty - - - - - - - - - - - - - - - - - - - - - - - - - - 88

16.6 Claims - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 88

16.7 Obligations of A.O. Smith - - - - - - - - - - - - - - - - - - - - - - - - 88

17 Appendices - - - - - - - - - - - - - - - - - - - - - - - - - - - 89

17.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 89

17.2 BFC Electrical Diagram. - - - - - - - - - - - - - - - - - - - - - - - - - 90

17.3 Week program card - - - - - - - - - - - - - - - - - - - - - - - - - - - 93

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1 Introduction

1.1 About the appliance

1.2 What to do if you smell gas

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

The alternative installation types are B23, C13, C33, C43, C53 and C63.

The information in this manual applies to the: BFC 80 and BFC 100.

The appliance has been manufactured and equipped in accordance with the European standard for gas-fired storage water heaters for the production of domestic hot water (EN 89). The appliances are therefore compliant with the European Directive for Gas Appliances, and and are entitled to bear the CE mark.

Warning

Read this manual carefully before starting up the water heater. Failure to read the manual and to follow the printed instructions may lead to personal injury and damage to the appliance.

Warning

If there is a gas smell:

No naked flames! No smoking!

Avoid causing sparks! Do not use any electrical equipment or switch, i.e. no telephones, plugs or bells!

1.3 Regulations

Open windows and doors!

Shut off the mains gas supply valve!

Warn occupants and leave the building!

After leaving the building, alert the gas distribution company or your installation engineer.

As the (end) user, installation engineer or service and maintenance engineer, you must ensure that the entire installation complies, as a minimum, with the official local:

• building regulations;

• energy supplier's directives for existing gas installations;

• directives and technical guidelines for natural gas installations;

• safety requirements for low-voltage installations;

• regulations governing the supply of drinking water;

• regulations governing ventilation in buildings;

• regulations governing the supply of air for combustion;

• regulations governing the discharge of products of combustion;

• requirements for installations that consume gas;

• regulations governing indoor waste water disposal;

• regulations imposed by fire brigade, power companies and municipality.

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Furthermore, the installation must comply with the manufacturer's instructions.

Note

Later amendments and/or additions to all regulations, requirements and guidelines published on or prior to the moment of installing, will apply to the installation.

1.4 Target groups

1.5 Maintenance

The three target groups for this manual are:

• (end) users;

• installation engineers;

• service and maintenance engineers.

Symbols on each page indicate the target groups for whom the information is intended. See the table.

Target group symbols

Symbol Target group

(End) user

Installation engineer

Service and maintenance engineer

A service should be carried out at least once a year, both on the water side and on the gas side. Maintenance frequency depends, among other things, on the water quality, the average burning time per day and the set water temperature.

Note

To determine the correct maintenance frequency, it is recommended to arrange for the service and maintenance engineer to check the appliance on both the water and gas side within three months following installation. Based on this check, the best maintenance frequency can be determined.

Note

Regular maintenance extends the service life of the appliance.

Note

Both the end user and the service and maintenance engineer are responsible for regular maintenance. They will need to establish clear agreements on this.

Note

If the appliance is not regularly maintained, the warranty will become void.

1.6 Forms of notation

10 Instruction manual BFC

The following notation is used in this manual:

Note

Important information.

Caution

Ignoring this information can lead to the appliance being damaged.

Warning

Failure to carefully read this information may lead to personal injury and

serious damage to the appliance.

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1.7 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 appliance

Installation This chapter describes the installation activity to be

Filling This chapter describes how to fill the appliance.

Draining This chapter describes how to drain the appliance.

The control panel This chapter describes the general control of the

Status of the appliance This chapter describes the status (mode or condition) that

Starting and running This chapter describes how to start the appliance running.

Shutting down This chapter describes how to shut the appliance down for

This chapter describes how the appliance functions.

completed before you actually start up the appliance.

appliance using the display.

the appliance may have, and possible actions to take.

The general heating cycle of the appliance is also described.

a brief or long period of time.

Main menu This chapter describes the main menu of the display. This

is the actual menu for the user, however the installation engineer and service and maintenance engineers will also need to use this menu.

Service program This chapter describes the service menu. It is mainly

intended for the installation engineer and service and maintenance engineers. End users may also refer to this chapter for additional information about the appliance.

Troubleshooting This chapter is mainly intended for the installation

engineer and the service and maintenance engineer. It describes appliance errors. These errors are indicated on the display. A troubleshooting table of possible causes and solutions is provided. End users may also refer to this chapter for additional information about the appliance.

Maintenance frequency This chapter describes how to determine the optimum

frequency at which to carry out maintenance. Both the end user and the service and maintenance engineer are responsible for regular maintenance. They need to reach clear agreement on this.

Note

If the appliance is not regularly maintained, the

warranty will become void.

Performing maintenance This chapter sets out the maintenance tasks to be carried

out during a service.

Warranty (certificate) This chapter states the warranty terms and conditions.

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2 Working principle of

the appliance

2.1 Introduction

2.2 General working principle of the appliance

Legend

Only applicable numbers are mentioned.

1. cover

2. hot water outlet

3. electrical connector block

4. electronic controller

5. pressure switch

6. control panel

7. temperature sensor T

8. combustion chamber

9. anode

10. tank

11. heat exchanger

12. inspection and cleaning opening

13. temperature sensor T

14. cold water inlet

15. drain valve

16. gas control

17. burner

18. fan

19. air supply hose

20. hot surface igniter

21. flame probe

22. chimney pipe

23. siphon

24. insulation layer

25. mains power choke

26. EMC filter

27. frequency controller

28. potentiostat

29. pallet

Topics covered in this chapter:

• General working principle of the appliance;

• The appliance's heating cycle;

• Protection for the appliance;

• Safety of the installation.

The figure shows a cut-away view of the appliance.

Cut-away view of the appliance

IMD-0219 R2

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Working principle of the appliance

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The appliance is equipped with a gas/air premix burner (17). The air is drawn in through the fan (18). The gas is supplied via the gas control (16) on the intake side of the fan. The gas/air mixture is then blown into the burner. The modulated supply of gas and air ensures that the optimum gas/air mixture is always achieved.

In this appliance the cold water enters the bottom of the tank via the cold water inlet (14). Once heated by the combustion chamber (8) and heat exchanger (11), the hot tapwater leaves the tank through the hot water outlet (2). Once the appliance is completely filled with water, it remains constantly under water supply pressure. As hot water is drawn from the appliance, it is immediately replenished with cold water.

The air required for combustion is forced into the burner (17) by the fan (18).

The gas is fed to the burner via the gas valve (16). Thanks to the modulated supply of gas and air, the optimum gas/air mixture is always achieved. The special construction of the burner causes the mixture to form a vortex (the cyclone effect), before it becomes ignited. This vorticity improves the ignition on the hot surface igniter (20), as well as ensuring optimum combustion efficiency. Through the special design of the heat exchanger (11), the flue gases are first led downwards via the combustion chamber, then upwards again via the heat exchanger, then once more downwards beside the water in the tank. In this process, the flue gases gradually become cooler. Because the cooled flue gases flow alongside the cold water lower down in the tank, they start to condense. This condensation causes latent heat energy to be released, which is transferred to the cooler water, thereby increasing the energy performance of the unit. The condensate yielded by this process is discharged via the siphon (23).

The insulation layer (24) prevents heat from escaping. The inside of the tank is enamelled to protect against corrosion. The anodes (9) provide extra protection against corrosion.

For use during maintenance, the appliance has an inspection and cleaning opening (12).

2.3 The appliance's heating cycle

2.4 Protection for the appliance

2.4.1 Introduction

<The entire appliance is controlled (and monitored) by the ThermoControl (electronic controller).The water temperature is measured by temperature sensors T1 (7) in the top of the tank (10) and T2 (13) at the bottom of the tank. These temperatures are sent to the electronic controller. Based on these two observations, the electronic controller calculates a net water temperature: T The value of T tank. As soon as controller registers a "heat demand". The gas control (16) is opened, and the gas is mixed with air. This mixture is ignited by the hot surface igniter (20) and the water becomes heated. As soon as ends, and the electronic controller stops the heating cycle.

The electronic controller assumes a certain margin both when registering and ending heat demand. We refer to this margin as the hysteresis (12.2 "Setting

the hysteresis").

The electronic controller monitors the water temperature and ensures safe combustion. This is achieved by:

• the Water temperature protection;

•theGas valve;

• the Fan;

lies between the temperatures at the top and bottom of the

net

falls below the set water temperature (T

Tnet

rises above T

Tnet

), the electronic

set

the heat demand

set

net

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•the Pressure switch;

•the Flame probe.

2.4.2 Water temperature protection

The electronic controller uses temperatures sensors T1 (7) and T2 (13) to monitor three temperatures that are important for safety. The table explains the functioning of the temperature sensors.

Temperature protection

Protection Description

Against frost (T1 < 5°C or T2 < 5°C)

For maximum water temperature (T1 > 85°C or T2 > 85°C)

For extra safety (T1 > 93°C or T2 > 93°C)

2.4.3 Gas valve

The frost protection cuts in. The water is heated to 20°C.

The high-limit safeguard serves to prevent overheating and/or excessive formation of scale in the appliance. If the high-limit safeguard is activated, the heating is stopped. This causes the water in the tank to cool down. Once the water has cooled sufficiently (T1 < 78°C), the electronic controller resets the appliance.

A lockout error of the water heater controller takes place. The controller must be manually reset before the appliance can resume operation (8.3 "Error

conditions"). The reset may only be performed if T1 <78°C.

The electronic controller opens the gas valve so that gas can be supplied to the burner. As a safety measure, the gas valve has a double shut-off. The double shut-off guarantees complete isolation of the appliance from the gas supply.

To help ensure smooth ignition, the gas valve opens gradually ('softlite").

2.4.4 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 electronic controller (4). The electronic controller takes control if the speed of rotation varies too much from the set value.

2.4.5 Pressure switch

The pressure switch ensures the discharge of flue gases and the supply of incoming air during the pre-purge and normal running of the appliance. The default state of the pressure switch is open. When sufficient pressure difference is reached, the pressure switch closes. However, in the event of a fault, the pressure switch is tripped open, and the heating cycle is interrupted. The table shows the trip point per appliance.

Note

The trip point of the pressure switch is not adjustable.

Pressure switch trip points

Appliance Closing pressure difference Opening pressure difference

BFC 80 >

BFC 100 >

1005 Pa < 975 Pa

1145 Pa < 1115 Pa

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2.5 Safety of the installation

Working principle of the appliance

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2.4.6 Flame probe

To ensure that no gas can flow when there is no combustion, the water heater is fitted with a flame probe (21). The electronic controller uses this probe to detect the presence of a flame, by means of ionisation detection. The electronic controller closes the gas control the instant it detects that there is a gas flow but no flame.

In addition to the appliance's standard built-in safety monitoring, the appliance must also be protected by an expansion vessel, expansion valve, pressure reducing valve, non-return valve and a T&P valve.

The use of an expansion vessel, expansion valve and/or pressure reducing valve depends on the type of installation: unvented or vented.

2.5.1 Unvented installation

With an unvented installation, an expansion valve valve and expansion vessel prevent the buildup of excessive pressure in the tank. This prevents damage being caused to the enamelled coating (in the appliance) or to the tank. A nonreturn valve prevents excessive pressure buildup in the water supply system. This valve also prevents water from flowing backwards from the tank into the cold water supply system. The pressure reducing valve protects the installation against an excessively high water supply pressure (> 8 bar). These components are fitted to the cold water pipe (3.6 "Water connections, Vented").

2.5.2 Vented installation

With a vented installation, excess pressure is taken up by the open cold water head tank. The height of the head tank determines the working pressure in the water heater, which may not exceed 8 bar. The installation must also be fitted with a vent pipe from the hot water pipe, that opens into the cold water tank.

Ideally, the vent pipe should discharge into a separate tundish/drain or otherwise to the open cold water head tank. The water heater should also be fitted on the hot water side with a stop valve (3.7.2 "Hot water side").

2.5.3 T&P valve

A T&P valve is only mandatory in an unvented installation. However, A.O. Smith also recommends the use of a T&P valve in vented installations.

A T&P (Temperature and Pressure Relief) valve monitors the pressure in the tank and the water temperature at the top of the tank. If the pressure in the tank becomes excessive (> 10 bar) or the water temperature is too high (> 97°C), the valve will open. The hot water can now flow out of the tank. Because the appliance is under water supply pressure, cold water will automatically flow into the tank. The valve remains open until the unsafe situation has been rectified. The appliance is fitted standard with a connecting point for a T&P valve (3.7.2 "Hot water side").

16 Instruction manual BFC

3 Installation

Warning

Installation work should 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 service.

The appliance may only be installed in a room that complies with the requirements stated in national and local ventilation regulations (1.3 "Regulations").

3.1 Introduction

3.2 Packaging

3.3 Environmental conditions

This chapter describes the installation activities to be carried out before you actually start using the appliance (9 "Starting and running"), namely:

• Packaging;

• Environmental conditions;

• Technical specifications;

• Water connections, Unvented;

• Water connections, Vented;

• Gas connection;

• Air supply and flue;

• Electrical connection;

• Checking the supply pressure and burner pressure;

In the event of conversion to a different gas category, see conversion (4 "Conversion to a different gas category").

To avoid damaging the appliance, remove the packaging carefully.

We recommend unpacking the appliance at or near its intended location.

Caution

The appliance may only be manoeuvred in an upright position. Take care

that the appliance is not damaged after unpacking.

The appliance is suitable for either open or room-sealed combustion. If installed as a room-sealed appliance, then the availability of the necessary external air supply will depend on the place of installation. In this event, there are no additional ventilation requirements.

If the appliance is to be installed as an open system, then it will be subject to the guidelines and ventilation regulations that are in force locally.

The alternative installation types are B23, C13, C33, C43, C53 and C63.

Caution

The appliance may not be used in rooms where chemical substances are stored or used, due to the risk of explosion and/or corrosion of the appliance. Some propellants, bleaching agents, degreasing agents etc. disperse vapours which are explosive and/or which cause accelerated corrosion. If the appliance is used in a room in which such substances are present, the warranty will be void.

Instruction manual BFC 17

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 environmental 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 max. 93% RV at +25°C

Ambient temperature Functional: 0 <

3.3.2 Maximum floor load

Allow for the appliance's weight with respect to the maximum floor load; refer to the table.

Weight specifications related to maximum floor load

Weight of the appliance filled with water

BFC 80, BFC 100 940 kg

3.3.3 Water composition

The appliance is intended for heating drinking water. The drinking water must comply with the regulations governing drinking water for human consumption. The table gives an overview of the specifications.

T < 60°C

Water specifications

Water composition

Hardness (alkaline earth ions)

Conductivity > 125 µS/cm

Acidity (pH value) 7.0 < pH value < 9.5

Note

If the water specifications deviate from those stated in the table, then the

tank protection cannot be guaranteed (16 "Warranty (certificate)").

3.3.4 Working clearances

For access to the appliance it is recommended that the following clearances are observed (see figure):

• AA: around the appliance's control column and cleaning openings: 100cm.

• BB: all sides of the appliance: 50cm.

Note

When installing the appliance, 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, then the appliance should be installed above a wastewater drain or in a suitable metal leak tray.

The leak tray must have an appropriate wastewater drain and must be at least 5cm deep with a length and width at least 5 m greater than the diameter of the appliance.

> 1.00 mmol/l:

• German hardness> 5.6° dH

• French hardness > 10.0° fH

• English hardness > 7.0° eH

18 Instruction manual BFC

Working clearances

3.4 Technical specifications

A A

The appliance is supplied without accessories. Check the dimensions (3.4.1 "Dimensions of the appliance"), gas data (3.4.3 "Gas data") and other specifications (3.4.2 "General and electrical specifications") of any accessories you plan to use.

IMD-0227 R2

Instruction manual BFC 19

Installation

3.4.1 Dimensions of the appliance

Plan and elevation of appliance (legend: see the table)

11º

18º

45º

IMD-0220 R4

20 Instruction manual BFC

Dimensions (all measurements in mm unless otherwise indicated)

Dimen sion

A Total height 2060 2060

C Position on pallet 530 530

D Appliance diameter 850 850

E Depth 1000 1000

F Width 900 900

G Diameter of flue gas outlet 130/200 130/200

H Height of flue gas outlet/air supply 2015 2015

Hx x position of flue gas outlet 310 310

Hy y position of flue gas outlet 440 440

K Height of gas connection 1855 1855

M Height of cold water supply 225 225

N Height of hot water outlet 2060 2060

Ny y position of hot water outlet 205 205

P Height of cleaning opening 290 290

R Height of drain valve connection 225 225

S Height of T&P valve connection 1425 1425

W Height of condensation drain 240 240

1 Cold water supply connection (external) R1

2 Hot water outlet (external) R11/

3 Gas control connection (internal) Rp3/

4 Drain valve connection (internal)

5 T&P valve connection (internal) 1 - 11.5 NPT 1 - 11.5 NPT

6 Cleaning/inspection opening 95x70 95x70

7 Condensation drainage connection (internal) Rp1 Rp1

Description BFC 80 BFC 100

/4"

R11/

Rp3/

/4"

3.4.2 General and electrical specifications

General and electrical specifications

DESCRIPTION Unit BFC 80 BFC 100

Content litres 460 460

Empty weight kg 480 480

Maximum operating pressure bar 8 8

Number of anodes - 2 2

Fan rotational speed at ignition rpm 2790 3120

Operational speed of fan rpm 5100 5700

Diameter of air restrictor mm 36.0 38.0

Heating-up time ∆T = 45

Electrical power consumption W 600 690

Supply voltage (-15% +10% VAC)

Mains frequency Hz (± 1Hz) 50 50

IP class - 30 30

C minutes 18 14

volts 230 230

Instruction manual BFC 21

Installation

3.4.3 Gas data

Gas data

Description II

Natural gas

Gas category G20-20 mbar

Orifice diameter mm 6.30 6.80

Nominal load (gross calorific value) kW 86.6 105.5

Nominal output kW 81.9 99.8

Supply pressure mbar 20 20

Burner pressure mbar 7.0 6.0

Gas consumption

LP gas

Gas category G31-37mbar (propane)

Orifice diameter mm 4.70 5.10

Nominal load (gross calorific value) kW 84.8 103.3

Nominal output kW 81.9 99.8

Supply pressure mbar 37 37

Burner pressure

Gas consumption

(*) Based on 1013.25 mbar and 15 °C. (†) If using a blank plate instead of a burner pressure regulator, it is assumed that the burner pressure is equal to

the supply pressure. In practice, however, the burner pressure will be lower.

2H3P

(*)

(†)

(*)

Unit BFC 80 BFC 100

m3/h 8.3 10.1

mbar 13 13

kg/h 6.1 7.4

22 Instruction manual BFC

3.5 Installation diagram

Legend

Only applicable numbers are mentioned.

1. pressure reducing valve

(mandatory)

3. T&P valve (mandatory)

4. stop valve (recommended in

pipe C and mandatory in pipe A)

5. non-return valve (mandatory)

6. circulation pump (optional)

9. drain valve

10. manual gas valve (mandatory)

11. service stop valve

12. temperature gauge (optional)

13. condensation drainage

14. hot water draw-off points

15. expansion valve (mandatory)

16. expansion vessel (mandatory)

17. 3-way aeration valve

(recommended)

18. water tank

19. float valve

A. cold water supply B. hot water supply C. circulation pipe D. gas supply E. overflow pipe H. overflow pipe

Installation diagram

UNVENTED

VENTED

14 14

464

IMD-0465 R1

Instruction manual BFC 23

Installation

3.6 Water connections, Vented

3.6.1 Cold water side

3.6.2 Hot water side

3.6.3 Circulation pipe

Warning

The installation should be carried out by an authorised installation engineer,

in compliance with general and local regulations (1.3 "Regulations").

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 appliance, as required by regulations (1.3 "Regulations").

See (B) in the installation diagram (3.5 "Installation diagram").

Note

Insulating long hot water pipes prevents unnecessary energy loss.

1. Fit the T&P valve (3).

2. Optional: fit a temperature gauge (12) so you can check the temperature of the tap water.

3. Fit a stop valve (4) in the hot water outlet pipe, for use when servicing.

4. If a circulation pipe is required, continue further by installing the circulation pipe (3.6.3 "Circulation pipe").

See (C) in the installation diagram (3.5 "Installation diagram").

If an immediate flow of hot water is required at draw-off points, a circulation pump can be installed. This improves comfort and reduces water wastage.

1. Fit a circulation pump (6) of the correct capacity for the length and resistance of the circulation system.

2. Fit a non-return valve (5) behind the circulation pump to guarantee the direction of circulation.

3. Fit two stop valves for service purposes (4).

4. Connect the circulation pipe to the cold water supply pipe.

3.6.4 Condensation drainage

1. Fit a sloping wastewater pipe to the siphon (13) for condensation drainage and connect this to the wastewater discharge in the boiler room.

Caution

All fittings behind the siphon must be condensation-resistant.

24 Instruction manual BFC

3.7 Water connections, Unvented

3.7.1 Cold water side

3.7.2 Hot water side

Warning

The installation should be carried out by an authorised installation engineer,

in compliance with general and local regulations (1.3 "Regulations").

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 applicable regulations (1.3 "Regulations").

2. The maximum working pressure of the appliance is 8 bar. Because the pressure in the water pipe at times can exceed 8 bar, you must fit an approved pressure-reducing valve (1).

3. Fit a non-return valve (5) and an expansion vessel (16).

4. Fit an expansion valve (15) and connect the overflow side to an open wastewater pipe.

See (B) in the installation diagram (3.5 "Installation diagram").

Note

Insulating long hot water pipes will prevent unnecessary energy loss.

1. Optional: fit a temperature gauge (12) so you can check the temperature of the tap water.

2. Fit the T&P valve (3).

3. Fit a stop valve (11) in the hot water outlet pipe for servicing.

Circulation pipe

See (C) in the installation diagram (3.5 "Installation diagram").

If an immediate flow of hot water is required at draw-off points, a circulation pump can be installed. This improves comfort and reduces water wastage.

1. Fit a circulation pump (6) of the correct capacity for the length and resistance of the circulation system.

2. Fit a non-return valve (5) behind the circulation pump to guarantee the direction of circulation.

3. Fit two stop valves for service purposes (4).

4. Connect the circulation pipe to the cold water supply pipe.

Condensation drainage

1. Fit a sloping wastewater pipe to the siphon (13) for condensation drainage and connect this to the wastewater discharge in the boiler room.

Caution

All fittings behind the siphon must be condensation-resistant.

Instruction manual BFC 25

Installation

3.8 Gas connection

3.9 Air supply and flue

3.9.1 Introduction

Warning

The installation should be carried out by an authorised installation engineer,

in compliance with general and local regulations (1.3 "Regulations").

Caution

Make sure that the diameter and length of the gas supply pipe are large

enough to supply sufficient capacity to the appliance.

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.

Warning

After fitting, check for leaks.

This section covers the following subjects:

• Requirements for flue gas discharge materials

• Concentric connections

• Parallel connections

3.9.2 Requirements for flue gas discharge materials

Warning

The installation should be carried out by an authorised installation engineer,

in compliance with general and local regulations (1.3 "Regulations").

Depending on the approved installation types, there are several alternatives for connecting the air supply and flue gas discharge.

The appliances are approved for installation types B23, C13, C33, C43, C53 and C63.

The figure and table give information about these appliance types. For an explanation of the possibilities, please contact the manufacturer.

26 Instruction manual BFC

Types of appliances

C43

B23 C33

C13 C53

IMD-0468 R0

Instruction manual BFC 27

Installation

Explanation of type of appliance

Type of appliance Description

B23 Air for combustion is drawn from the boiler room.

C13 Concentric and / or parallel wall flue terminal

C33 Concentric and / or parallel roof flue terminal

C43 Appliances on common air supply and flue gas discharge (concentric and / or

C53 Air supply and flue terminal types mixed.

C63 Appliances supplied without flue components and / or terminal. These

3.9.3 Concentric connections

parallel) in multi-storey building.

appliances must be installed in compliance with local regulations.

Note

Make sure that the chimney discharges into an area where this is permitted

for this category of appliance.

The table shows the requirements for concentric systems.

Warning

Install flue gas discharge pipe runs with a run-off of 5 mm per metre.

Flue gas discharge requirements for concentric systems (C13, C33)

Appliance Diameter Maximum length Maximum

number of 90° bends

BFC 80 130/200mm 15m 3

BFC 100 130/200mm 15m 3

Caution

Both conditions stated in the table must be fulfilled.

Even if there are less bends than the stated maximum, the maximum pipe length may not be exceeded.

Even if the total pipe length is less than the stated maximum, the maximum number of bends may not be exceeded.

The following example illustrates how to use the table.

Practical example of concentric flue gas discharge

Example

The figure shows a BFC 100 installation. The appliance must be fitted with 12m of concentric pipe (C13/C33) and three 90 degree bends. We need to check whether this configuration complies with the requirements stated in the table.

28 Instruction manual BFC

Appliance with concentric flue gas discharge material

IMD-0286 R2

According to the table, the maximum length allowed is 15 metres, and there may be up to three 90° bends. Both requirements are fulfilled.

Specifications

Caution

For type C13 and C33 installations,A.O. Smith prescribes the use of a roof or wall-mounted terminal, exclusively of a type approved for the appliance. Use of an incorrect roof or wall-mounted flue terminal can cause the installation to malfunction.

Instruction manual BFC 29

Installation

Concentric wall flue terminal specifications C13

Subject Description

Wall flue terminal set:

• 1x wall flue terminal (incl. wall flange & clamping ring)

• 1x pipe 500mm

• 1x bend 90°

Pipe material Construction Concentric

Pipe diameters Flue gas

No other wall flue terminal is permitted. Use this item number to order the wall conduit set from supplier,

manufacturer or wholesaler.

Concentric roof flue terminal specifications C33

Item No. 0302 326

Construction Concentric

Manufacturer Muelink & Grol

Type M2000 MDV SEC

Flue gas discharge

Air supply Thin-walled galvanised sheet steel

discharge

Air supply Ø 200mm

Thick-walled aluminium with lip ring seal

Ø 130mm

Subject Description

Roof flue terminal set:

• 1x wall flue terminal (incl. clamping ring)

• 1x pipe 1000mm

• 1x mounting flange

Pipe material Construction Concentric

Pipe diameters Flue gas

No other wall flue terminal is permitted. Use this item number to order the wall conduit set from supplier,

manufacturer or wholesaler.

Item No. 0306 855

Construction Concentric

Manufacturer Muelink & Grol

Type M2000 DDV SEC

Flue gas discharge

Air supply Thin-walled galvanised sheet steel

discharge

Air supply Ø 200mm

Thick-walled aluminium with lip ring seal

Ø 130mm

30 Instruction manual BFC

3.9.4 Parallel connections

The table states the maximum pipe lengths for parallel systems. The maximum pipe length depends on the chosen diameter.

Warning

Install flue component pipe runs with a run-off of 5 mm per metre.

Table of pipe lengths

Appliance Diameter

BFC 80 130mm 115m 2.4m 1.4m

BFC 100 130mm 60m 2.4m 1.4m

BFC 80 150mm 115m 2.6m 1.6m

BFC 100 150mm 100m 2.6m 1.6m

1) Parallel systems with diameter of 130mm or 150mm. If the maximum total length for a diameter of 130mm is insufficient, 150mm diameter should be used. Any diameter enlargement must be carried out on both air supply and flue gas discharge.

You must use the longest pipe when calculating the pipe length. For example, if the chimney pipe is 35 metres and the air supply pipe is 32 metres, then 35 metres should be taken as the length for calculation. Next, add the L every 90° and 45° bend to this 35 metres, in both the air supply and flue gas discharge. The following practical example illustrates how to use the table.

Maximum total length

equivalent

90° bend

equivalent

45° bend

equivalent

for

Practical example of parallel flue gas discharge

Example

The figure shows a BFC 100 installation. This has to be fitted with a 35m parallel pipe 130mm in diameter plus eight 90° bends. We need to check whether this configuration complies with the requirements stated in the table.

Instruction manual BFC 31

Installation

Appliance with parallel flue gas discharge material

3.10 Electrical connection

IMD-0285 R2

The longest pipe must be used to check the maximum length. In this case, the chimney pipe is the longest. This is 35 metres. This 35 metres is the sum of pipe sections 1, 2, 3, 4 and 5. The length of the transition piece can be ignored. The total number of bends used in the flue gas discharge and air supply is 8. The bend in the transition piece can be ignored. According to the table, 2.4 metres per bend must be added. This brings the total pipe length to:

(2.4 x 8) + 35 = 19.2 + 35 = 54.2m.

This is less than the maximum length of 60 metres stated in the table. The installation therefore fulfils the requirements.

Warning

The installation should be carried out by an authorised installation engineer,

in compliance with general and local regulations (1.3 "Regulations").

3.10.1 Introduction

Topics covered in this paragraph:

• Preparation;

• Connecting the mains voltage;

32 Instruction manual BFC

Optionally, it is possible to connect an isolating transformer, a continuous pump, a program-controlled pump, an extra ON mode switch and an extra alarm signal to the appliance. For these options, see:

• Isolating transformer;

• Connecting a program-controlled pump;

• Connecting an extra ON mode switch ("Tank ON");

• Connecting an extra error signal ('Alarm OUT' ).

Note

The optional components are not included in the rating for electrical power

consumption stated in the table (3.4.2 "General and electrical specifications").

3.10.2 Preparation

Caution

The appliance is phase-sensitive. It is absolutely essential to connect the mains phase (L) to the phase of the appliance, and the mains neutral (N) to the neutral of the appliance.

Caution

There may be no potential difference between neutral (N) and earth ( ). If this is the case, then an isolating transformer must be applied in the supply circuit (3.10.4 "Isolating transformer").

Legend

A. screws B. protective cap C. connector block

For more information or to order this isolating transformer, please contact A.O. Smith water Products Company.

The figure shows a view of the electrical connector block, and the table shows the appropriate connections.

Connector block

IMD-0224 R3

Instruction manual BFC 33

Installation

In preparation, you must first remove the two plastic covers and the protective cap of the electrical section.

1. Undo the screws of the plastic covers.

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

3. Loosen the 2 screws (A) of the electrical section, and remove the protective cap (B) from the electrical section. The connector block (C) is now visible.

Note

Consult the table for the connections and consult the electrical diagram for

the electrical component connections.

Electrical connector block

Circulation

pump

-L

123456789101112131415161718192021222324

Frequency

controller

NL4NX3X4NL

Ta nk

Program-

controlled

pump

Alarm Off Isolating transformer

primary secondary

X1X

Mains

voltage

3.10.3 Connecting the mains voltage

The appliance is supplied without a power cable and isolator.

Note

In order to receive electrical power, the appliance has to be connected to the

mains power by means of a permanent electrical connection. A double-pole isolator with a contact gap of at least 3 mm must be fitted between this permanent connection and the appliance. The power cable must have cores of at least 3 x 1.0 mm2.

Warning

Leave the appliance isolated until you are ready to start it up.

1. Connect phase (L), neutral (N) and earth ( ) of the power cable to terminals 22 through 24 of the connection block as indicated in the table (3.10.2 "Preparation").

2. Fit the power cable in the strain relief.

3. Connect the power cable to the isolator.

4. If you have no more connections to make:

- Fit the cap on the electrical terminal block.

- Fit the plastic covers onto the appliance.

3.10.4 Isolating transformer

An isolating transformer should be used if there is a case of 'floating neutral'.

1. Refer to fitting instructions provided with the isolating transformer. (Contact the supplier for details of the correct isolating transformer.)

2. Connect phase (L), neutral (N) and earth ( ) to terminals 16 through 21 of the terminal block as stated in the table (3.10.2 "Preparation").

3. Fit the cables in the strain relief.

34 Instruction manual BFC

4. If you have no more connections to make:

- Fit the cap on the electrical terminal block.

- Fit the plastic covers onto the appliance.

5. Connect the power cable to the isolator.

3.10.5 Connecting a program-controlled pump

1. Connect phase (L), neutral (N) and earth ( ) to terminals 10, 11 and 12 as stated in the table (3.10.2 "Preparation").

2. Fit the cable in the strain relief.

3. If you have no more connections to make:

- Fit the cap on the electrical terminal block.

- Fit the plastic covers onto the appliance.

3.10.6 Connecting an extra ON mode switch ("Tank ON")

Tank ON is a facility for connecting an external ON/OFF switch. In the OFF position, the programmed operating state is active. In the ON position, the programmed operating mode is overruled, and the "ON mode" is active.

1. Connect the cables (X table (3.10.2 "Preparation").

2. Fit the cable in the strain relief.

3. If you do not need to make any more connections:

- Fit the cap on the electrical connector block.

- Fit the plastic covers onto the appliance.

and X4) to points 8 and 9 according to the

3.10.7 Connecting an extra error signal ('Alarm OUT' )

3.11 Checking the supply pressure and burner pressure

Alarm OUT is a potential free terminal that is switched when an error is detected. This can be used to signal errors, for example with a lamp. A 230 V circuit can be directly powered. Other voltages require a relay prescribed by the manufacturer.

1. Connect the phase cables (X the table (3.10.2 "Preparation"). If required, connect earth ( ) to terminal 15.

2. Fit the cable in the strain relief.

3. If you have no more connections to make:

- Fit the cap on the electrical terminal block.

- Fit the plastic covers onto the appliance.

Note

Before starting the appliance and/or checking the supply pressure and

burner pressure, you must fill (5 "Filling") the appliance.

Caution

Before starting up for the first time or after conversion, you must always

check the supply pressure and burner pressure.

Note

The easiest way to check the gas pressures is by using two pressure

gauges. This procedure assumes that these two gauges are available.

and X2) to terminals 13 and 14 according to

Instruction manual BFC 35

Legend

Only applicable numbers are mentioned.

1. supply pressure test nipple

2. burner pressure test nipple

3. burner pressure regulator

4. burner pressure control cap

5. burner pressure control adjusting screw

Installation

Gas control

3.11.1 Preparation

To check the supply pressure and burner pressure, proceed as follows:

1. Isolate (10.3 "Electrically isolating the appliance") the water heater from the power supply.

2. Undo the screws of the plastic covers.

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

3.11.2 Procedure to check pressures

1. There are two test nipples on the gas control:

- a supply pressure nipple (1)

- a burner pressure nipple (2)

Sealing screws are located inside the test nipples. Loosen both sealing screws by a few turns. Do not completely loosen them; they can be difficult to re-tighten.

2. Connect a pressure gauge to the burner pressure nipple (2).

3. Open the gas supply and vent the gas supply line with the supply pressure nipple (1).

4. Connect a pressure gauge to the supply pressure nipple (1) when gas starts to flow from this nipple.

5. Switch on the power to the appliance using the isolator on the appliance.

6. Switch the electronic controller ON by setting the 0/I switch to position I.

IMD-0260 R1

36 Instruction manual BFC

n min

The display will now show go to the main menu.

INTERNAL CHECK

MENU »OFF ^ ON È WEEK PROGRAM

IMD-0423 R

0063

INTERNAL CHECK

for about 10 seconds and

7. Activate the "ON mode" by going through the following steps:

- Press the blue arrow once ( ) to position the cursor in front of

and

press . The display shown here will appear.

»START OPERATION ^ CHANGE SETPOINT È Tset=65ÉC

- Confirm the by pressing

START OPERATION

The appliance is now in the "ON mode" and will ignite.

8. Once the display shows the text

RUNNING

you must wait about 1 minute before reading the dynamic pressures (the fan needs this time to run up to full rotational speed).

9. Use the pressure gauge to read the supply pressure at 1nipple (1) (3.4.3 "Gas data").

Note

Consult the mains gas supply company if the supply pressure is not correct.

10. Use the pressure gauge to read the burner pressure at nipple (2) (3.4.3 "Gas data").

If the burner pressure is not correct and the appliance is fitted with a blank plate, you will not be able to adjust the pressure. Finalise (3.11.4 "Finalising"), and in this case, consult your installation engineer or supplier.

If the appliance is indeed fitted with a burner pressure regulator, the pressure can be adjusted as described in the procedure (3.11.3 "Adjusting the

pressure").

Instruction manual BFC 37

Installation

3.11.3 Adjusting the pressure

1. Remove the cap (4) from the burner pressure regulator (3).

2. Correct the burner pressure by turning the adjusting screw (5), depending on the correction required:

- Adjustment screw anticlockwise: burner pressure decreases.

- Adjustment screw clockwise: burner pressure increases.

3. Cover the opening of the adjusting screw and check the burner pressure against the value given in the gas table (3.4.3 "Gas data").

4. If the pressure is not set correctly, repeat the preceding steps until the correct pressure is attained.

5. Fit the cap (4) back on the burner pressure regulator.

6. Activate the "OFF mode" of the electronic controller:

MENU »OFF ^ ON È WEEK PROGRAM

7. If the press .

- Use and to place the cursor beside

- Confirm with .

8. Wait until the fan has stopped, and switch the electronic controller off.

is not displayed:

OFF

Caution Failure to wait until the fan stops can cause damage to the appliance.

9. Finish off (3.11.4 "Finalising").

3.11.4 Finalising

1. Shut off the gas supply.

2. Disconnect the two pressure gauges and retighten the sealing screws in the test nipples.

3. Replace the cover.

Note

Before starting-up the appliance, take time to fill in the warranty card

supplied with the appliance. This enables us to guarantee the quality of our systems, and to further enhance our warranty procedure.

Please return this card as soon as possible. Your customer will then receive a warranty certificate with our warranty conditions.

38 Instruction manual BFC

4 Conversion to a

Legend

Unused numbers are not applicable

2. three-part gas coupling

6. orifice with stamped figures

different gas category

Caution

The conversion may only by carried out by an authorised installation

engineer.

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

Caution

You must check the supply pressure and burner pressure once the

conversion is complete.

Orifice assembly

IMD-0225 R2

1. Isolate the appliance from the power supply (10.3 "Electrically isolating the

appliance").

2. Shut off the gas supply.

3. Undo the screws of the plastic covers.

4. Carefully remove the covers from the appliance.

Instruction manual BFC 39

Conversion to a different gas category

5. Detach the 3-part gas coupling (2) adjacent to the burner.

6. Select and fit the correct orifice from the conversion kit, based on the gas table (3.4.3 "Gas data"). The injector diameter is stamped into each injector (6).

7. Refit the 3-part gas coupling (2).

8. Check the burner pressure and supply pressure (3.11 "Checking the supply

pressure and burner pressure").

9. Replace the cover.

10. Remove the sticker showing the new gas category from the conversion kit, and attach it below the appliance's rating plate. This clearly indicates that the appliance may no longer be run on the gas for which it was originally supplied.

11. Start (9 "Starting and running") the appliance.

40 Instruction manual BFC

gis

5 Filling

Legend

Only applicable numbers are mentioned.

1. pressure reducing valve (mandatory)

3. T&P valve (mandatory)

4. stop valve (recommended in pipe C and mandatory in pipe A)

5. non-return valve (mandatory)

6. circulation pump (optional)

9. drain valve

10. manual gas valve (mandatory)

11. service stop valve

12. temperature gauge (optional)

13. condensation drainage

14. hot water draw-off points

15. expansion valve (mandatory)

16. expansion vessel (mandatory)

17. 3-way aeration valve (recommended)

18. water tank

19. float valve

A. cold water supply B. hot water supply C. circulation pipe D. gas supply E. overflow pipe H. overflow pipe

Installation diagram

UNVENTED

VENTED

14 14

645

IMD-0465 R1

Instruction manual BFC 41

5.1 Filling the appliance

5.1.1 Filling unvented installations

Filling

gis

To fill the appliance, proceed as follows:

1. Open the stop valve (11) in the hot water pipe and, if present, the stop valves (4) for the circulation pump (6).

2. Close the drain valve (9).

3. Open the nearest hot water draw-off point (14).

4. Open the stop valve (4) on the cold water side (A) so that cold water flows into the appliance.

5. Completely fill the appliance. When a full water jet flows from the nearest draw-off point, the appliance is full.

6. Bleed the entire installation of air, for example by opening all draw-off points.

7. The appliance is now under water supply pressure. There should be no water coming out of the expansion valve (15), nor the T&P valve (3). If this does happen, the cause might be:

- The water supply pressure is greater than the specified 8 bar.

Rectify this by fitting a pressure reducing valve (1).

- The expansion valve in the protected cold supply setup is defective or

incorrectly fitted.

5.1.2 Filling vented installations

To fill the appliance, proceed as follows:

1. Open the stop valve (11) in the hot water pipe and, if present, the stop valves (4) for the circulation pump (6).

2. Close the drain valve (9).

3. Open the nearest hot water draw-off point (14).

4. Open the stop valve (4) on the cold water side (A) so that cold water flows into the appliance.

5. Completely fill the appliance. When a full water jet flows from the nearest draw-off point, the appliance is full.

6. Bleed the entire installation of air, for example by opening all draw-off points.

7. The appliance is now under water supply pressure. There should be no water coming out of the T&P valve (3). If this does happen, the T&P valve might be defective or incorrectly fitted.

42 Instruction manual BFC

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6 Draining

Legend

Only applicable numbers are mentioned.

1. pressure reducing valve (mandatory)

3. T&P valve (mandatory)

4. stop valve (recommended in pipe C and mandatory in pipe A)

5. non-return valve (mandatory)

6. circulation pump (optional)

9. drain valve

10. manual gas valve (mandatory)

11. service stop valve

12. temperature gauge (optional)

13. condensation drainage

14. hot water draw-off points

15. expansion valve (mandatory)

16. expansion vessel (mandatory)

17. 3-way aeration valve (recommended)

18. water tank

19. float valve

A. cold water supply B. hot water supply C. circulation pipe D. gas supply E. overflow pipe H. overflow pipe

Installation diagram

UNVENTED

VENTED

14 14

645

IMD-0465 R1

Instruction manual BFC 43

6.1 Draining unvented installations

Draining

gis

1. Activate the

MENU »OFF ^ ON È WEEK PROGRAM

2. Position the cursor in front of

3. Confirm

4. Wait until the fan has stopped. The symbol is then dimmed.

Caution Failure to wait until the fan stops purging can cause damage to the

appliance.

5. Switch the appliance OFF (position 0) using the ON/OFF switch on the control panel.

OFF

with .

min

with .

OFF

6.2 Draining vented installations

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IMD-0423 R

6. Isolate the water heater from the power supply by putting the isolator between the appliance and the mains power supply to position 0.

7. Shut off the gas supply (10).

8. Close the stop valve (11) in the hot water pipe.

9. Close the supply valve (4) in the cold water supply (A).

10. Open the drain valve (9).

11. Bleed the appliance (or installation) so that it drains completely.

1. Activate the

2. Position the cursor in front of

3. Confirm

4. Wait until the fan has stopped. The symbol is then dimmed.

Caution Failure to wait until the fan stops purging can cause damage to the

appliance.

OFF

with .

OFF

5. Switch the appliance OFF (position 0) using the ON/OFF switch on the control panel.

44 Instruction manual BFC

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6. Isolate the water heater from the power supply by putting the isolator between the appliance and the mains power supply to position 0.

7. Shut off the gas supply (10).

8. Close the stop valve (11) in the hot water pipe.

9. Close the stop valve (4) between the water tank and the cold water inlet (A).

10. Open the drain valve (9).

11. Bleed the appliance (or installation) so that it drains completely.

Instruction manual BFC 45

Draining

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46 Instruction manual BFC

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7 The control panel

7.1 Introduction

Topics covered in this chapter:

• Controls;

• Meaning of icons;

• Electronic controller ON/OFF switch;

• Navigation buttons;

• PC connection.

7.2 Controls

<The entire appliance is controlled (and monitored) by the ThermoControl (electronic controller).The figure shows the electronic controller.

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The control panel is completely menu-driven, and comprises:

• a 4-line display with 20 characters per line;

• 6 pushbuttons for operating the appliance (below the display);

• 6 graphical symbols (above the display);

• a connector for a service PC;

• an ON/OFF switch.

The pushbuttons are divided into three groups:

• Navigation buttons:

- Buttons for UP , and DOWN ;

-Enter: ;

- Reset button:

• the main menu (11 "Main menu"): ;

• the service program (12 "Service program"): . This chapter is specifically intended for the service and maintenance engineer and installation engineer.

In this manual, the display of the electronic controller is shown as in the figure, both with and without icons.

»START OPERATION ^ CHANGE SETPOINT È Tset=70ÉC

7.3 Meaning of icons

The table explains the meanings of the icons.

Icons and their meaning

Name Meaning

Heat demand Heat demand detected

Purge Pre- and post-purge using

fan

Pressure switch Pressure switch is closed

Glowing (Pre)glow

Gas control Gas control open/ignition

Flame detection Appliance operational

7.4 Electronic controller ON/OFF switch

The ON/OFF switch of the electronic controller is used to switch the appliance ON and OFF. Note that in the OFF position the appliance remains electrically live, in order for the continuous pump to stay running.

INTERNAL CHECK

After switching on, the text appears on the display for about 10 seconds. Themain menu (11 "Main menu") then appears. If no selection is made in the main menu, the appliance automatically switches to the OFF mode (8.2 "Operating modes").

Note

To electrically isolate the appliance, you must use the isolator between the appliance and the mains power supply.

INTERNAL CHECK

7.5 Navigation buttons

The use of these buttons is explained with the help of the figure that shows the main menu (11 "Main

menu").

The navigation buttons are:

Instruction manual BFC 47

• Buttons for UP , and DOWN ;

• Enter: ;

• Reset button: .

The

arrows and È indicate that you can scroll up

and/or down. Use the buttons and to scroll.

MENU OFF ^»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.

The main menu comprises:

WEEK PROGRAM, EXTRA PERIOD SETTINGS

options

The selected option is confirmed using .

Pressing the button takes you back one page in a menu and discards all options selected in the current menu.

. You have to scroll down further to see the

EXTRA PERIOD

OFF, ON

and

The control panel

and

SETTINGS

gis

Note

The button is also used to reset the

appliance following an error.

7.6 PC connection

The PC connection is solely intended to enable technicians from A.O. Smith to display the status and history of the appliance. These details can be important for troubleshooting and/or responding to complaints.

48 Instruction manual BFC

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8 Status of the

appliance

8.1 Introduction

Topics covered in this chapter:

• Operating modes;

• Error conditions;

• Service condition.

8.2 Operating modes

When running, the appliance has four basic operating modes, namely:

•

OFF

•

EXTRA

•

PROG

8.2.1

In this mode, the frost protection is activated. The figure shows the display with the following information:

• line one: the text

• line two: the time, the day and alternately (9.3 "The

• lines three and four: the text

OFF 13:45 Thursday 6ÉC FROST PROTECTION ACTIVATED

OFF

;

appliance's heating cycle") T

FROST PROTECTION ACTIVATED

and T

net

• line four: blank when the appliance is idle, or

depending on the heating cycle (9.3 "The

appliance's heating cycle"), displays a text such as

HEAT DEMAND

ON 13:45 Thursday 67ÉC

8.2.3

In this mode, one extra period is programmed and activated. In this mode, the temporarily overruled to fulfil a single period of demand. Once the period has passed, the appliance automatically returns to the previous operating mode. The figure shows the display with the following information:

• line one: the text

• line two: the time, the day and alternately (9.3 "The

• line three: the switch-on time, and the related

• line four: the text

EXTRA 12:30 Thursday 76ÉC TH 12:45 Tset 75ÉC PERIOD ACTIVATED

EXTRA

appliance's heating cycle") T

water temperature setting;

Tset 75ÉC

OFF

PROG

EXTRA

;

and T

PERIOD ACTIVATED

mode is

;

net

8.2.2

In this mode, the appliance continually responds to the hot water demand. The figure shows the display with the following information:

• line one: the text ON;

• line two: the time, the day and alternately (9.3 "The

• line three: the programmed water temperature

appliance's heating cycle") T1 and T

;

set

net

Instruction manual BFC 49

Status of the appliance

gis

8.2.4

In this mode a preset week program is active, and the appliance responds continually to demand within the time periods set in the week program. There are two distinct situations possible in this mode:

PROG 10:00 Monday 76ÉC MO 11:15 Tset 75ÉC

1. The current time falls within a set time period

PROG 12:00 Monday 76ÉC MO 11:15 PERIOD ACTIVATED

2. The current time falls outside a set time period

In all modes, the temperature may at any moment drop below the desired temperature. The appliance then enters a heating cycle. This heating cycle is identical (9.3 "The appliance's heating cycle") for all basic operating modes.

PROG

of the week program.

The figure shows the display with the following information:

PROG

- line one: the text

- line two: the time, the day and T1 and T alternately (9.3 "The appliance's heating

cycle");

- line three: the next scheduled switch-off time and the water temperature T period;

- line four: is empty, or depending on the heating cycle (9.3 "The appliance's heating

cycle"), a text such as

of the week program.

The figure shows the display with the following information:

- line one: the text

- line two: the time, the day and T alternately (9.3 "The appliance's heating

cycle");

- line three: the next scheduled switch-on time;

- line four: displays the text

PERIOD ACTIVATED

;

HEAT DEMAND

PROG

;

of the active

set

and T

net

8.3 Error conditions

The figure shows an example of an error condition. If the appliance enters this condition, the display will show the following information:

• line one: error code comprising a letter and two digits, followed by the error description;

• lines two to four: alternately, a brief explanation of the error, and a brief action to resolve the error.

S04: SENSOR ERROR

CHECK

SENSOR OR DUMMY

Caution

The displayed action to resolve the error may only

be performed by a service and maintenance engineer.

There are various types of errors:

• LOCK OUT ERRORS

When the cause has been removed, these errors require a reset with the button before the appliance can resume operation.

• BLOCKING ERRORS

These errors disappear automatically once the cause of the error has been removed, after which the appliance resumes operation by itself.

The display does not show what type of error has been detected. A comprehensive overview of the errors is provided elsewhere in the manual (13 "Troubleshooting").

If, as end-user, you find the appliance in an error condition, you may attempt to restart the appliance by pressing the button

However, if the error returns or occurs several times in a short time you must contact your service and maintenance engineer.

Note

Setting and if necessary programming of the basic operating modes are described in the main menu (11 "Main menu") chapter.

50 Instruction manual BFC

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8.4 Service condition

The figure shows the message

!!! WARNING !!!

MAX. BURNING HOURS:

SERVICE REQUIRED

then the appliance is in need of a service and maintenance inspection. In that case, contact your service and maintenance engineer.

Note

The message the number of expired burning hours and the preset service interval. Should the service interval have been incorrectly selected, contact the service and maintenance engineer for instructions on how to adjust this. Information on the maintenance frequency is provided elsewhere in the manual (14 "Maintenance frequency").

.Should this message appear,

SERVICE REQUIRED

is based on

Instruction manual BFC 51

Status of the appliance

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52 Instruction manual BFC

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9 Starting and running

9.1 Introduction

Topics covered in this chapter, in sequence:

• Starting and running.

• The appliance's heating cycle.

9.2 Starting and running

Start the appliance as follows:

1. Fill the appliance (5 "Filling").

2. Open (3.5 "Installation diagram") the manual gas

valve.

3. Switch on the power to the appliance using the

isolator between the appliance and the power

supply.

4. Switch the electronic controller ON by setting the

ON/OFF switch to position I.

»START OPERATION ^ CHANGE SETPOINT È Tset=65ÉC

6. Confirm the

The appliance is now in "ON mode". If there is a heat demand, the appliance will run through the heating cycle (9.3 "The appliance's heating

cycle").

If the heating cycle is not run, there is no heat demand; if this is the case, Tset will probably need to be set (11.3 "Setting the water temperature").

START OPERATION

by pressing

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IMD-0423 R

The display will now show

about 10 seconds and go to the main menu.

INTERNAL CHECK

MENU »OFF ^ ON È WEEK PROGRAM

for

9.3 The appliance's heating cycle

The appliance's heating cycle is activated as soon as the measured water temperature (T threshold value (T on the currently selected appliance operating mode. For example, if the appliance is in "OFF mode" (frost protection), then this value is 5°C. If the appliance is in "ON mode", then this threshold value is selectable, for example, 65°C.

The heating cycle runs in turn through the following states:

1. HEAT DEMAND;

2. PRE-PURGE;

3. PRESSURE SWITCH;

4. PRE-GLOW;

5. IGNITION;

6. RUNNING;

7. POST-PURGE.

The complete cycle is explained in the following example, which assumes the appliance is in the basic

mode

operating modes.

Note

The same heating cycle applies to the other

). This threshold value depends

set

) falls below the

net

5. Press the blue arrow once ( ) to position the

cursor in front of

display shown in the figure will appear.

and press . The

Instruction manual BFC 53

Starting and running

gis

Once the appliance starts, it will run through the following steps:

1. The water temperature drops below the set

temperature of (for example) controller detects a demand and starts the heating cycle.

- The icon is activated.

- The message

HEAT DEMAND

°C. The electronic

appears.

ON Ê 13:45 Thursday 63ÉC

Tset 65ÉC

HEAT DEMAND

2. Once demand is registered, the fan is started to exhaust 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.

ON Ê Ê 13:45 Thursday 63ÉC

Tset 65ÉC

PRE PURGE

3. During the pre-purge, the pressure switch closes.

- The icon is activated.

- The message

appears.

PRESSURE SWITCH

5. After a number of seconds pre-glow, the gas control is opened and ignition takes place.

- The icon is activated.

- The message

IGNITION

appears.

ON Ê Ê Ê 13:45 Thursday 63ÉC

Tset 65ÉC

IGNITION

6. After ignition, the flame is detected and the appliance will be running. This means that actual heating has started. The fan speed then increases to the normal working speed, and the pressure switch closes:

- The icon is dimmed.

- The icons and are activated.

- The message

RUNNING

appears.

ON ÊÊÊ Ê 13:45 Thursday 63ÉC

Tset 65ÉC

RUNNING

7. When the water is up to temperature, the heat demand drops off and the post-purge starts. This lasts about 25 seconds.

- The icons , and are dimmed.

- The icon is activated.

- The message

POST PURGE

appears.

ON Ê Ê Ê 13:45 Thursday 63ÉC

Tset 65ÉC

PRESSURE SWITCH

4. After some time, the pre-purge ceases and the electronic controller reduces the fan speed to the ignition speed. This is followed by the (pre-)glow of the hot surface igniter.

- The icons and are dimmed

- The icon is activated.

ON Ê Ê 13:45 Thursday 63ÉC

Tset 65ÉC

GLOW PLUG

ON Ê Ê 13:45 Thursday 65ÉC

Tset 65ÉC

POST PURGE

8. Following the post-purge, the fan stops and the pressure switch opens:

- The icons and are dimmed.

- The message

POST PURGE

vanishes.

ON 14:05 Thursday 65ÉC

With any subsequent heat demand, the heating cycle will resume from step 1.

54 Instruction manual BFC

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10 Shutting down

10.1 Introduction

This chapter describes:

• Shut the appliance down for a brief period ("OFF

mode");

• Electrically isolating the appliance;

• Shutting the appliance down for a long period.

10.2 Shut the appliance down for a brief

period ("OFF mode")

To shut the appliance down for a brief period, you must activate the frost protection.

You can use the frost protection to prevent water freezing in the appliance.

Activate the frost protection as follows:

1. Press the button to select the main menu.

2. Use and to position the cursor in front of

Confirm with .

OFF 13:45 Thursday 6ÉC FROST PROTECTION ACTIVATED

The frost protection cuts in if the water temperature

FROST

drops below 5°C. The text line one of the display. The appliance heats the water to 20°C (T

Note

These values of 5°C and 20°C cannot be adjusted.

) and drops back to the

set

will then appear on

OFF

mode.

10.3 Electrically isolating the appliance

The appliance should only be isolated from mains power in the correct way. The correct procedure is as follows:

1. Activate the

2. Position the cursor in front of

3. Confirm

OFF

with .

OFF

4. Wait until the fan has stopped. The symbol is then dimmed.

5. Switch the appliance OFF (position 0) using the ON/OFF switch on the control panel.

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IMD-0423 R

6. Isolate the appliance from the power supply by

setting the isolator between the appliance and the mains power supply to position 0.

10.4 Shutting the appliance down for a long

period

Drain the appliance if you are shutting it down for a long period. Proceed as follows:

1. Isolate the appliance from the power supply (10.3 "Electrically isolating the appliance").

2. Shut off the gas supply.

3. Close the stop valve in the hot water pipe.

4. Close the supply valve of the protected cold supply set-up.

5. Open the drain valve

6. Bleed the appliance (or installation) so that it drains completely.

MENU »OFF ^ ON È WEEK PROGRAM

Caution Failure to wait until the fan stops purging can

cause damage to the appliance.

Instruction manual BFC 55

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56 Instruction manual BFC

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11 Main menu

11.1 Notational convention for menu-related instructions

The

( ) of the electronic controller is divided into submenus. For example, functions reached from the main menu. The

SETTINGS

For example,

SETTINGS LANGUAGE

notational convention:

• :

Confirm with .

This means:

1. : Activate the main menu with .

SETTINGS

SETTINGS LANGUAGE

LANGUAGE

4. Confirm with . After entering , you

will have activated the

menu is divided into submenus in turn.

LANGUAGE

. So, for example, to select the menu, this manual uses the following

SETTINGS

: Use the and/or buttons to go to and confirm with .

: Use the and/or buttons to go to

SETTINGS

is a submenu of

LANGUAGE

is one of the

submenu.

11.2 Switching on the "ON mode"

You can switch the appliance to the ON mode from any operational mode, as follows:

1. :

Confirm with .

START OPERATION

• to decrease the value.

• Confirm with .After confirming, the appliance enters "ONmode".

SETPOINT

» 65ÉC

Note

If the preset temperature is higher than the current

water temperature, then the appliance might not immediately start the heating cycle. To prevent excessively frequent switching on and off, there is a heating margin. The standard setting for this margin is 4°C. The appliance starts heating when the water temperature is 4°C colder than the SETPOINT. We refer to this margin as the hysteresis. The service and maintenance engineer can adjust (12.2 "Setting

the hysteresis") this setting.

11.3.2 Setting water temperature during

ON mode

The water temperature can also be directly adjusted when the appliance is in the "ON mode". Simply use:

• to increase the value;

• to decrease the value.

• Confirm with .

Note

First consult the chapter about switching

on (9 "Starting and running") too.

11.3 Setting the water temperature

11.3.1 Setting the water temperature via the SET POINT MENU

The water temperature can be set to any value between 40°C and 80°C.

Set the water temperature via:

1. :

Confirm with .

START OPERATION ^»CHANGE SETPOINT È Tset=65ÉC

2. Use:

• to increase the value;

CHANGE SETPOINT

ON 13:45 Thursday 65ÉC

Tset»65ÉC

11.4 Week program

Using the week program, you can set the water temperature for the days and times you want.

If the appliance is running under a week program, this is indicated on the display by the line (see the figure). The second line shows the time of day, the day of the week and the temperature. The third line shows the next switching time of the week program and the programmed temperature. The fourth line shows the

PROG 07:55 Monday 64ÉC MO 08:00 Tset 75ÉC PROGRAM ACTIVATED

PROGRAM ACTIVATED

PROG

text on the first

text.

Instruction manual BFC 57

Main menu

gis

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°C.

If you want, you can change every setting in the appliance's standard week program.

If the water temperature becomes too low while the week program is running, the appliance will run through the heating cycle (9.3 "The appliance's

heating cycle") and return to the week program.

This following are discussed:

• Starting and stopping the week program

• Changing the appliance's standard week program

• Adding times to a week program

• Deleting times from a week program

11.5 Starting and stopping the week program

The week program can be started up from any other operating mode, as follows:

1. :

A week program can be shut down simply by activating a different operating mode, for example the "ON mode".

WEEK PROGRAM

Confirm with .

START OPERATION

11.6 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: day of the week, hours and

minutes:

• switch-off time: hours and minutes;

• the water temperature setting;

• on/off setting for a program-controlled pump.

Note

The switch-off time must always be followed by a switch-off time on the same day of the week. A maximum of three periods may be programmed per day. You can program a maximum of 21 periods.

Call up the menu for the week program as follows:

•:

WEEK PROGRAM

Confirm with .

WEEK PROGRAM

START OPERATION ^»PROGRAM OVERVIEW È

PROGRAM OVERVIEW

The display shows the menu for the week program, see the figure below. With the default setting, the program switches on and off every day at 00:00 and 23:59 hours respectively, the water temperature is 65°C and the pump is switched on (P).

DAY TIME Tset ON »SU 00:00 65ÉC P OFF SU 23:59 ON MO 00:00 65ÉC P

OFF MO 23:59 ON TU 00:00 65ÉC P OFF TU 23:59 ON WE 00:00 65ÉC P OFF WE 23:59 ON TH 00:00 65ÉC P OFF TH 23:59 ON FR 00:00 65ÉC P OFF FR 23:59 ON SA 00:00 65ÉC P OFF SA 23:59

INSERT DELETE

START OPERATION

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 75 °C and the pump will run continuously. The following settings are entered one by one via the menu: the switch-on time, the switch-off time, the desired water temperature, and the mode of the program-controlled pump.

11.6.1 Week program: setting the switchon time

1. Bring the cursor to SU

Confirm with .

ON »SU 00:00 OFF SU 23:59 Tset 65ÉC PUMP ON SAVE

The day indicated by

2. Use and to set the desired day. In the example

this is

Confirm with .

ON SU»00:00 OFF SU 00:59 Tset 65ÉC PUMP ON SAVE

The cursor moves to the hour digits, which flash.

3. Use and to set the hours. In the example, this

08.

(Sunday).

flashes.

58 Instruction manual BFC

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Confirm with .

The cursor moves to the minute digits, which flash.

ON SU 08»00 OFF SU 08:00 Tset 65ÉC PUMP ON SAVE

Note

Because the switch-off time can never be earlier than the switch-on time, the switch-off time setting is automatically adjusted with the switch-on time.

4. Use and to set the minutes. In the example,

this is

Confirm with .

The cursor moves to the switch-off hour digits,

which flash.

ON SU 08:15 OFF SU»08:15 Tset 65ÉC PUMP ON SAVE

11.6.2 Week program: setting the switch-

off time

1. Use and to set the hours. In the example, this

Confirm with .

The cursor moves to the minute digits, which flash.

ON SU 08:15 OFF SU 12»15 Tset 65ÉC PUMP ON SAVE

2. Use and to set the minutes. In the example,

this is

Confirm with .

The cursor moves to the desired water

temperature.

ON SU 08:15 OFF SU 12:45 Tset»65ÉC PUMP ON SAVE

11.6.3 Week program: setting the water

temperature

1. Use and to set the water temperature. In the

example this is 75°C.

Confirm with .

The cursor moves to

PUMP ON

11.6.4 Week program: setting the programcontrolled pump

1. If required, a pump can be controlled during the

period. Use and to set 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 .

The cursor moves to

ON SU 08:15 OFF SU 12:45 Tset 75ÉC PUMP»ON SAVE

2. Confirm with .

The display shown in the figure will appear.

DAY TIME Tset ON »SU 08:15 75ÉC P OFF SU 12:45 ON MO 00:00 65ÉC P

OFF MO 23:59 ON TU 00:00 65ÉC P OFF TU 23:59

3. If you wish, you can use to scroll to another day, and change more switch-on times (11.6.1 "Week

program: setting the switch-on time") and switch-

off times (11.6.2 "Week program: setting the

switch-off time").

4. After changing all desired switch-on and switch off times, you can start running the week program:

Scroll with to Confirm with .

START OPERATION

PUMP ON

SAVE

. The pump

11.7 Adding times to a week program

Call up the menu to times into a week program as follows:

1. :

WEEK PROGRAM

Confirm with .

WEEK PROGRAM

START OPERATION ^»PROGRAM OVERVIEW È

INSERT

switch-on and switch-off

PROGRAM OVERVIEW

ON SU 08:15 OFF SU 12:45 Tset 75ÉC PUMP»ON SAVE

Instruction manual BFC 59

Main menu

gis

The display shows the menu for the week program. The cursor points to the active period.

DAY TIME Tset ON »SU 08:15 75ÉC P OFF SU 12:45 ON MO 00:00 65ÉC P

....................

OFF SA 23:59

INSERT DELETE START OPERATION

2. Scroll to

Confirm with .

The sub-menu for adding a period will appear.

ON »SU 08:15 OFF SU 12:45 Tset 75ÉC PUMP ON SAVE

Example

As an example, we will program an extra period in which the switch-on time is set to 18:00 hours, and the corresponding switch-off time to 22:00 hours. The water temperature will be set to 75 °C and the pump will run continuously.

DAY TIME Tset ON »SU 18:00 75ÉC P OFF SU 22:00 ON MO 00:00 65ÉC P

OFF MO 23:59

....................

OFF SA 23:59

INSERT DELETE START OPERATION

INSERT

11.8 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 appliance are programmed as in the figure.

DAY TIME Tset ON »SU 08:15 75ÉC P OFF SU 12:45 ON SU 18:00 75ÉC P

OFF SU 22:00

....................

OFF SA 23:59 INSERT

DELETE

START OPERATION

To delete a period, proceed as follows:

1. :

2. Scroll with to

3. Scroll with to

WEEK PROGRAM

Confirm with .

OFF ^»ON È WEEK PROGRAM

Confirm with .

WEEK PROGRAM

START OPERATION ^»PROGRAM OVERVIEW È

The display shows the menu for the week

program.

Confirm with .

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 flash.

PROGRAM OVERVIEW

DELETE

3. Proceed as follows:

a. Set the switch-on time (11.6.1 "Week program:

setting the switch-on time").

b. Set the switch-off time (11.6.2 "Week program:

setting the switch-off time").

c. Set the water temperature (11.6.3 "Week

program: setting the water temperature").

d. Set the program-controlled

pump (11.6.4 "Week program: setting the

program-controlled pump").

5. To activate the week program with the new period added, scroll down with to

START OPERATION

and confirm with .

DAY TIME Tset ON !SU 08:15 75ÉC P OFF SU 12:45 ON SU 18:00 75ÉC P

OFF SU 22:00

....................

OFF SA 23:59

INSERT DELETE

START OPERATION

4. Scroll with to the day to be deleted. For

example, the figure.

(Sunday) in the second period. See

60 Instruction manual BFC

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Confirm with .

DAY TIME Tset ON !SU 18:00 75ÉC P OFF SU 22:00 ON MO 00:00 65ÉC P

OFF MO 23:59

....................

OFF SA 23:59

INSERT DELETE START OPERATION

5. The lines showing switch-on/off times are replaced by the text

Confirm with . (or use to cancel)

DAY TIME Tset ON ! DELETE OFF BLOCK? ON MO 00:00 65ÉC P

The switching period has been deleted. You will return now to the week program menu. The cursor points to the first programmed period.

DAY TIME Tset ON »SU 08:15 75ÉC P OFF SU 12:45 ON MO 00:00 65ÉC P

OFF MO 23:59

....................

OFF SA 23:59

INSERT DELETE

START OPERATION

6. Scroll with to

Confirm with .

The week program is active.

DELETE BLOCK?

START OPERATION

. See the figure.

11.9 Extra period

Use an extra period when you either want to have the appliance switch on and off for a certain period, either without modifying the active week program, or without taking the appliance out of the OFF mode (frost protection active).

If the appliance is running under an "extra period", then this is indicated in the display with the text

EXTRA

EXTRA 10:00 Monday 76ÉC MO 11:15 Tset 75ÉC PERIOD ACTIVATED

If the water temperature becomes too low during the extra period (11.10 "Programming an extra period"), the appliance will run through the heating cycle (9.3 "The appliance's heating cycle") and fall back into the extra period.

The same settings can be made for an extra period as for a week program (11.6 "Changing the appliance's

standard week program") period.

11.10 Programming an extra period

1. Call up the menu for entering an extra period via:

2. :

Setting the switch-on time

1. Use and to set the day. In the example this is

2. Use and to set the switch-on hour to the

than the switch-on time, the switch-off time setting is automatically adjusted with the switch-on time.

3. Use and to set the minutes. In the example,

EXTRA PERIOD

Confirm with .

ON ^ WEEK PROGRAM È»EXTRA PERIOD

The display show the settings for the extra period.

Confirm with .

The cursor moves to the hour digits, which flash.

ON SU»00:00 OFF SU 00:59 Tset 65ÉC PUMP ON START

desired value. In the example, this is

Confirm with .

The cursor moves to the minute digits, which flash.

ON SU 08»00 OFF SU 08:00 Tset 65ÉC PUMP ON START

Note

Because the switch-off time can never be earlier

this is 15.

Confirm with .

The cursor moves to the hour digits of the switchoff period.

ON SU 08:15 OFF SU»08:15 Tset 65ÉC PUMP ON START

08.

Instruction manual BFC 61

Main menu

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Setting the switch-off time

1. Use and to set the hours. In the example, this

012

Confirm with .

The cursor moves to the minute digits, which flash.

ON SU 08:15 OFF SU 12»15 Tset 65ÉC PUMP ON START

2. Use and to set the minutes. In the example,

this is

Confirm with .

The cursor moves to the water temperature. See the figure

ON SU 08:15 OFF SU 12:45 Tset»65ÉC PUMP ON START

Setting the water temperature

1. Use and to set the water temperature. In the example this is 75°C.

Confirm with .

The cursor moves to

ON SU 08:15 OFF SU 12:45 Tset 75ÉC PUMP»ON START

Setting the program-controlled pump

1. If required, a pump can be controlled during the period. Use and to set 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 .

The cursor moves to

ON SU 08:15 OFF SU 12:45 Tset 75ÉC PUMP ON »START

2. Confirm with .

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

period will NOT be automatically switched on.

PUMP ON

START

. The following week, the extra

. The pump

11.11 Settings

Using the settings and read certain appliance data:

• Adjustable settings

• Displayable appliance specifications, this

SETTINGS

- Language of the menu.

- Current day of week and time.

category is only relevant to the installation engineer and/or service and maintenance engineer

- Control range (water temperature).

- Ignition speed of fan.

- Working speed of fan.

option, you can adjust certain

11.11.1 Setting menu language

To set menu language:

WEEK PROGRAM ^ EXTRA PERIOD È»SETTINGS

1. Call up the menu for selecting the language as follows:

2. :

3. The cursor is positioned beside

4. Scroll with to the desired language.

The language is set.

SETTINGS

Confirm with .

The display shows the menu for settings.

SETTINGS »LANGUAGE ^ DAY/TIME È SPECIFICATIONS

Confirm with .

The display shows the language selection menu.

LANGUAGE

ENGLISH

^ NEDERLANDS È»DEUTSCH

FRANCAIS ITALIANO CZECH

ESPANOL

Confirm with .

LANGUAGE

62 Instruction manual BFC

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11.11.2 Setting day and time

To enter the time and day:

WEEK PROGRAM ^ EXTRA PERIOD È»SETTINGS

1. Call up the menu for entering the day and time as follows:

2. :

3. Scroll with and to

4. The cursor is positioned beside

5. The cursor moves to the hour digits, which flash.

SETTINGS

Confirm with .

The display shows the menu for settings.

Confirm with .

SETTINGS

LANGUAGE ^»DAY/TIME È SPECIFICATIONS

The display shows the sub-menu for adjusting the day.

DAY

»Sunday ^ Monday È Tuesday

Wednesday Thursday Friday Saturday

Scroll with and to the desired day.

Confirm with .

The day has been set. The display shows the submenu for adjusting the time.

TIME »00:00

Scroll with and to the current hour, for example 15.

Confirm with .

TIME 15»00

DAY/TIME

Sunday

Confirm the minute setting with

TIME 15»45

The time has been set.

Note

The appliance takes no account of daylight saving.

11.11.3 Displaying appliance specifications

Note

This category is solely intended for the installation

engineer and/or service and maintenance engineer.

The table shows the correct settings.

BFC 80 BFC 100

Ignition fan speed (rpm)

Working speed of fan (rpm)

Regulation interval

(

Call up the menu to display the appliance specifications as follows:

1. :

2. Scroll with to

SETTINGS

Confirm with .

WEEK PROGRAM ^ EXTRA PERIOD È»SETTINGS

Confirm with .

SETTINGS

LANGUAGE ^ DAY/TIME È»SPECIFICATIONS

The display shows the sub-menu for displaying appliance specifications.

SPECIFICATIONS »REGULATION INTERVAL ^ IGNITION SPEED È WORKING SPEED

2790 3120

5100 5700

40 - 80 40 - 80

SPECIFICATIONS

3. Scroll with to the section to be displayed, for

6. The cursor moves to the minute digits, which flash.

Scroll with and to the next minute, for example

45.

example

REGULATION INTERVAL

Instruction manual BFC 63

The relevant display appears.

REGULATION INTERVAL

80ÉC

Main menu

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64 Instruction manual BFC

12 Service program

12.1 Introduction

The service program is used by the installation engineer or service and maintenance engineer for:

• Setting the hysteresis;

• Displaying the error history;

• Displaying the appliance history;

• Display the selected appliance;

• Switching the pump on or off;

• Setting the service interval;

• Setting the display contrast;

• Setting the display backlight time;

• Setting the display scroll speed.

SERVICE MENU »HYSTERESE ^ HISTORY OF ERRORS È APPLIANCE HISTORY

SELECT APPLIANCE PUMP RELAY SERVICE INTERVAL CONTRAST DISPLAY TIME BACKLIGHT SCROLLSPEED

These sub-menus are briefly described in the following paragraphs. If you are not familiar in general with how to use the displays and menus, first read the relevant section (7 "The control panel").

Note

The notation convention for the service menu is identical to that of the main menu (11.1 "Notational

convention for menu-related instructions"). The

difference is, you use to bring up the service program, instead of which brings up the main menu.

12.2 Setting the hysteresis

If the preset temperature (SETPOINT) is higher than the current water temperature, then the appliance might not immediately start the heating cycle (9.3 "The appliance's heating cycle"). To prevent excessively frequent switching on and off, there is a heating margin. We refer to this margin as the

hysteresis. The standard setting for this margin is 2°C. The heating cycle starts if the water temperature drops to 2°C below the SETPOINT and ends when the water reaches 2°C above the SETPOINT.

HYSTERESE UP »3ÉC

Set the hysteresis via:

•:

Set the hysteresis via:

•:

HYSTERESE UP

The figure shows an example

HYSTERESE DOWN

12.3 Displaying the error history

Display the error history as follows:

•:

The controller will display an overview of "Blocking errors" and "Lock out errors". In both cases, the electronic controller reserves 15 lines for the last 15 error messages. If there are fewer than 15 error messages, an ellipsis (...) is displayed. The display first shows the "Blocking errors". When is pressed, the "Lock out errors" are then displayed.

The figure shows an example of "Blocking errors". In this case, the text by

HISTORY OF ERRORS(B)

È CO2 50 HZ ERROR

The figure shows an example of "Lock out errors". In this case, the text by

HISTORY OF ERRORS(L)

È ...

causes, please refer to the relevant chapter (13 "Troubleshooting").

HISTORY OF ERRORS

(B)

S04 SENSOR ERROR F06 IONIZATION

HISTORY OF ERRORS

(L)

F02 FAN F07 FLAME ERROR

Note

For an overview of all errors and the possible

is followed

Instruction manual BFC 65

Service program

12.4 Displaying the appliance history

The appliance history submenu is used to display the burning hours, the number of ignitions, the number of flame errors and the number of ignition errors.

Call up the menu for displaying the appliance history as follows:

•:

APPLIANCE HISTORY BURNINGHOURS 000410 ^IGNITIONS 001000 ÈFLAME ERRORS 000021

IGNIT ERROR 000013

APPLIANCE HISTORY

The figure shows an example.

12.5 Display the selected appliance

Call up the menu for displaying the appliance selection as follows:

•:

SELECT APPLIANCE »5934 ^ 8576 È 3379

SELECT APPLIANCE

The appliance number can be found on the rating plate.

The appliance selection has been correctly preset in the factory.

6527

....

12.6 Switching the pump on or off

If a program-controlled pump is installed (3.10.5 "Connecting a program-controlled

pump"), it can be switched ON or OFF as follows:

•:

PUMP RELAY

The standard setting for the pump relay is OFF.

12.7 Setting the service interval

To aid servicing, the electronic controller includes a service interval which is used to set the frequency of maintenance interval (14.2 "Determining service

interval") by the service and maintenance engineer,

based on the number of burning hours.

The service interval is based on the number of burning hours. This can be set to 500, 1000 and 1500 hours. The standard setting for number of hours is 500. Once the preset number of hours is reached, a message (8.4 "Service condition"). to this effect will appear. Adjust the service interval via:

•:

SERVICE INTERVAL » 500 ^ 1000 BURNING HOURS È 1500

SERVICE INTERVAL

12.8 Setting the display contrast

Adjust the display contrast via:

•:

CONTRAST DISPLAY

The standard setting is 100%. The range is from 0 through 100%.

The figure shows the related display.

» 95 %

12.9 Setting the display backlight time

Set the backlight time (the time that the display backlight remains lit after the last button is pressed) as follows:

•:

TIME BACKLIGHT

The standard value is 255 s. The range is 0 to 255 seconds.

The figure shows the related display.

PUMP RELAY »ON

OFF

» 255 sec

12.10 Setting the display scroll speed

If the mode active, then the setting for mode

EXTRA PERIOD

selection for the pump relay in the service menu.

Example

One of the week program 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.

WEEK PROGRAM

has priority over the ON/OFF

EXTRA PERIOD

WEEK PROGRAM

Adjust the control speed via:

•:

SCROLLSPEED

The default is 10. The range is from 0 through 100. Setting the value too high or low will make scrolling difficult.

» 10

66 Instruction manual BFC

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13 Troubleshooting

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 a table with general errors (13.2 "Troubleshooting

table for general errors").

• Displayed errors

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 shows the appropriate checking action.

S02:SENSOR ERROR

TOP TANK SENSOR 1

NOT CONNECTED

S02: SEMSOR ERROR

CHECK TOP TANK

SENSOR

There are various types of errors, all falling into one of two groups:

- LOCK OUT ERRORS When the cause has been removed, these errors require a reset with the button, before the appliance can resume operation.

- BLOCKING ERRORS These errors disappear automatically once the cause of the error has been removed, after which the appliance resumes operation by itself.

The manual includes a table of error messages that can appear (13.3 "Displayed errors").

Instruction manual BFC 67

13.2 Troubleshooting table for general errors

Warning

Maintenance may only be performed by a qualified service and maintenance engineer.

General errors

Symptom Cause Solution Remark

Gas smell Gas leak

Display is off Appliance is turned off Start the appliance up (9 "Starting and running")

No supply voltage present

Defective fuse(s) Replace fuse(s) To replace the fuses, you must contact your installation engineer.

Warning

Close the main gas valve immediately.

Warning

Do not operate any switches.

Warning

No naked flames.

Warning

Ventilate the boiler room.

1. Check if the isolator is ON.

2. Check that there is power to the isolator.

3. Check whether the ON/OFF switch of the electronic controller is ON (position I).

4. Check whether there is power to the electrical connector block.

5. The measured voltage must be 230 VAC (-15%, +10%).

Warning

Contact your installation engineer or local gas company

immediately.

See the BFC electrical diagram (17 "Appendices") If the error persists, consult your installation engineer.

Instruction manual BFC 68

Symptom Cause Solution Remark

Water leakage Leakage from a water

connection (threaded)

Condensate leakage Check that the condensation water discharge is working properly.

Leakage from another nearby water appliance or pipe segment

Leakage from the appliance's tank

Explosive ignition Incorrect supply

pressure and/or burner pressure

Contaminated burner Clean the burner(s) (15.4.2 "Clean the burner(s)")

Contaminated orifice Clean the orifice(s) (15.4.3 "Clean the orifice(s)")

Hot water supply insufficient or absent

Appliance is turned off Start the appliance up (9 "Starting and running")

No supply voltage present

Hot water supply is used up

The controller is in OFF mode.

Temperature (T set too low.

set

Tighten the threaded connection If the leak persists, consult your installation engineer

Rectify if necessary

Trace the leak

Consult the supplier and/or manufacturer

Set the correct supply pressure and/or burner pressure. (3.11 "Checking the supply pressure and burner

pressure")

1. Check if the isolator is ON.

2. Check that there is power to the isolator.

3. Check whether the ON/OFF switch of the electronic controller is ON (position I).

4. Check whether there is power to the electrical connector block.

5. The measured voltage must be 230 VAC (-15%, +10%).

Reduce hot water consumption and give the appliance time to heat up.

Switch the controller to the ON mode (11.2 "Switching on the "ON

mode"")

) is

Adjust (11.3 "Setting the water temperature") temperature (T a higher value.

set

If ignition is not improved, consult your installation engineer.

See the BFC electrical diagram (17 "Appendices") If the error persists, consult your installation engineer.

If there continues to be insufficient hot water, or none at all, consult your installation engineer.

) to

Instruction manual BFC 69

13.3 Displayed errors

Code + Description Cause Solution Remark

S01 (blocking error)

Open circuit from temperature sensor T2 at bottom of the tank

S02 (blocking error)

Open circuit in sensor 1 of temperature sensor T

at the top of the

(1)

tank

S03 (blocking error)

Open circuit in sensor 2 of temperature sensor T1 at the top of the tank (1).

S04 (blocking error)

Open circuit from dummy 1

S05 (blocking error)

Open circuit from dummy 2

S11 (blocking error)

Short circuit in the temp. sensor T2 at the bottom of the tank

Sensor is not (correctly) connected

Damaged cable or defective sensor

Sensor is not (correctly) connected

Damaged cable or defective sensor

Sensor is not (correctly) connected

Damaged cable or defective sensor

Dummy is not (correctly) connected

Defective dummy Replace the dummy sensor To replace the necessary parts, you must contact your installation

Dummy is not (correctly) connected

Defective dummy Replace the dummy sensor To replace the necessary parts, you must contact your installation

Short circuit in sensor circuit

Connect the sensor lead to JP3 See the BFC electrical diagram (17 "Appendices")

Replace the sensor To replace the necessary parts, you must contact your installation

engineer

Connect the sensor lead to JP5 See the BFC electrical diagram (17 "Appendices")

Replace sensor T

Connect the sensor lead to JP5 See the BFC electrical diagram (17 "Appendices")

Replace sensor T

Connect the dummy sensor (dummy sensor 1 and 2) leads to JP4. See the BFC electrical diagram (17 "Appendices")

Replace sensor T

To replace the necessary parts, you must contact your installation engineer

engineer

To replace the necessary parts, you must contact your installation engineer

Instruction manual BFC 70

Code + Description Cause Solution Remark

S12 (blocking error)

Short circuit in sensor 1 of temperature sensor T

at the top of the

(1)

tank

S13 (blocking error)

Short circuit in sensor 2 of temperature sensor T1 at the top of the

(1)

tank

S14 (blocking error)

Short circuit from dummy 1

S15 (blocking error)

Short circuit from dummy 2

F01 (blocking error)

Defect in power supply circuit

Short circuit in sensor circuit

Live and neutral connected wrong way round

Condensation on the flame probe

Floating neutral Install an isolating transformer (3.10.4 "Isolating transformer") Contact your installation engineer to have an isolating transformer

Replace sensor T

Replace the dummy sensor

Connect live and neutral correctly (3.10 "Electrical connection"); the appliance is phase-sensitive

1. Disconnect the lead at the flame probe

2. Ignite the appliance three times, with an interrupted ionisation circuit

3. Reconnect the ionisation lead to the flame probe

4. Ignite the appliance again

5. The repeated ignition attempts will have caused the condensation to evaporate

(2)

To replace the necessary parts, you must contact your installation engineer

See the BFC electrical diagram (17 "Appendices")

If errors persist, contact your installation engineer

installed

Instruction manual BFC 71

Code + Description Cause Solution Remark

F02 (lock out error)

Fan fails to run at correct speed.

The F02 entries below are applicable solely to appliances that have a 3-phase fan with frequency controller.

Fun supplying insufficient pressure

Defective motor and/or rotor.

Damaged wiring 1. Check the wiring between the fan and the controller.

Dirty or blocked fan 1. Check if the fan is dirty

Because of a drop in the supply voltage, the fan is not running at the correct speed.

The live (phase) wires, between freq. controller and fan are connected wrong way around

1. Check the motor and rotor

2. Replace the fan if the motor or rotor is defective.

3. Reset appliance controller

2. If any wires are damaged, the wiring harness must be replaced.

3. Reset appliance controller

2. Check that the rotor can rotate freely

3. Reset appliance controller

1. Check the supply voltage, this must be 230 VAC (-15%, +10%).

2. Reset appliance controller

1. Check the wiring between the fan and the frequency controller

2. Rectify the assembly if it is incorrect

3. Reset appliance controller

See the BFC electrical diagram (17 "Appendices")

To have the wiring replaced and a new fan fitted, you must contact your installation engineer

See the BFC electrical diagram (17 "Appendices")

To replace the necessary parts, you must contact your installation engineer

Fan speed too low 1. Check the fan speed

2. If the fan speed is too low, check the settings

3. If the settings are correct, then replace the fan.

4. Modify the settings if incorrect

5. Reset appliance controller

Instruction manual BFC 72

Code + Description Cause Solution Remark

Air pressure switch fails to close during prepurge.

Fan supplying insufficient pressure

Air pressure switch leads

Loose air pressure switch hoses

Heat exchanger and/or chimney flue is blocked

Defective controller 1. Check that the controller is receiving power

The live (phase) wires between frequency controller and fan are connected wrong way around

1. Check the wiring between the air pressure switch and the controller. Rectify any defect:

- if any wires are damaged, replace the wiring harness

- properly connect loose or detached hoses

2. Reset appliance controller

1. Check hoses between air pressure switch and burner/fan. Rectify any defect:

- if any wires are damaged, replace the wiring harness

- properly connect loose or detached hoses

2. Reset appliance controller

3. Measure the pressure differential across the air pressure switch

4. Check the values (2.4.5 "Pressure switch")

5. Check heat exchanger, condensation drainage and/or chimney flue for blockages

6. Clear any blockage that may be present.

7. Reset appliance controller

2. Check that the controller is correctly connected

3. If there is no electrical power, check the power supply to the terminal block, or replace the controller.

4. Rectify any incorrect connections.

5. Reset appliance controller

1. Check the wiring between the fan and the freq. controller

2. Rectify the assembly if it is incorrect

3. Reset appliance controller

See the BFC electrical diagram (17 "Appendices")

To replace the necessary parts, you must contact your installation engineer

Instruction manual BFC 73

Code + Description Cause Solution Remark

Fan speed too low 1. Check the fan speed

2. If the fan speed is too low, check the settings

3. If the settings are correct, then replace the fan.

4. Modify the settings if incorrect

5. Reset appliance controller

Differential air pressure switch not closing during pre-purge

DAPS leads 1. Check the wiring between the DAPS and the controller

2. a) If any wires are damaged, the wiring harness must be replaced.

b) Properly connect any loose wiring

3. Reset appliance controller

Loose DAPS hoses 1. Check the hoses between the DAPS and the burner/fan

2. a) Replace any broken hoses.

b) Properly connect any loose hoses

3. Reset appliance controller

Heat exchanger and/or chimney flue is blocked

Defective controller 1. Check that the controller is receiving power

1. Measure the pressure differential across the DAPS

2. Compare the pressure values (2.4.5 "Pressure switch")

3. Check heat exchanger, condensation drainage and/or chimney flue for blockages

4. Clear any blockage that may be present.

5. Reset appliance controller

2. Check that the controller is correctly connected

3. If there is no electrical power, check the power supply to the terminal block, or replace the controller

4. Rectify any incorrect connections

5. Reset appliance controller

See the BFC electrical diagram (17 "Appendices")

To replace the necessary parts, you must contact your installation engineer

Instruction manual BFC 74

Code + Description Cause Solution Remark

F03 (lock out error)

The pressure switch fails to work correctly

Damaged wiring/Open circuit

Pressure switch not closing

1. Check the wiring between the pressure switch and the controller

2. If necessary, replace the wiring

1. Check the running speed of the fan (12.5 "Display the selected

appliance")

2. Check that the hoses on the pressure switch and the air supply hose between fan and burner are correctly fitted. Refit them if necessary

3. Check for cracks in the hoses on the pressure switch and in the air supply hose between fan and burner. If necessary, replace the hoses.

4. Check that the flue gas outlet is compliant (3.9 "Air supply and

flue").

5. Check for blockage in the flue gas discharge. Remove any blockage that may be present

6. Check for blockage in the condensation water discharge. Remove any blockage that may be present.

7. Measure the pressure differential across the pressure switch. See the table in Preparation for maintenance (15.2 "Preparation for maintenance"). If there is insufficient pressure differential, clean the heat exchanger. If the pressure differential is acceptable, check that the pressure switch is closing, using a multimeter.

If the error cannot be resolved or is persistent, contact your installation engineer To replace the necessary parts, you must contact your installation engineer

Instruction manual BFC 75

Code + Description Cause Solution Remark

F04 (lock out error)

Three unsuccessful ignition attempts.

F05 (lock out error)

Too many flame errors have been signalled.

No gas 1. Open the main gas valve and/or the manual gas valve supplying

the water heater

2. Check the supply pressure to the gas control

3. If necessary, repair the gas supply

Air in the gas pipes Bleed the air out of the gas pipe See Checking the supply pressure and burner pressure for how to

No burner pressure 1. Check the burner pressure to the gas control

2. Check that the gas valve(s) open and shut correctly

3. If necessary, replace the gas control.

Defect in the hot surface igniter circuit

Defect in the ionisation circuit

Supply voltage too low Check the supply voltage, this must be 230 VAC (-15%, +10%).

Incorrect roof or wall conduit.

Recirculating flue gases.

1. Check that the hot surface igniter is correctly connected (JP2).

2. Check the wiring of the hot surface igniter.

3. Measure the resistance across the hot surface igniter. This must lie between 2 and 5 ohms.

4. Check that the hot surface igniter lights up during ignition.

5. If necessary, replace the hot surface igniter.

1. Check that the flame probe is correctly connected (JP2)

2. Check the wiring of the flame probe

3. Measure the ionisation current. This must be at least 1.5 microamps.

4. Replace the wiring if necessary.

1. Check that the correct roof or wall flue conduit (3.9 "Air supply

and flue") has been fitted.

2. If necessary, install the correct roof or wall conduit.

3. Check that the roof or wall conduit discharges into a permitted area.

To repair the gas supply, contact your installation engineer

bleed air from the gas line, and measure the supply pressure and burner pressure.

To replace the necessary parts, you must contact your installation engineer

If the error persists, contact your installation engineer. To replace the necessary parts, you must contact your installation engineer

If the error cannot be resolved or is persistent, contact your installation engineer

Instruction manual BFC 76

Code + Description Cause Solution Remark

F06 (lock out error)

Short circuit between flame probe and earth

F07 (lock out error)

A flame has been detected after the gas valve was closed.

F08 (lock out error)

Error message from safety relay

F09 (lock out error)

Water temperature safety.

Damaged cable in contact with metal surface.

Ceramic part of the flame probe is broken/cracked.

Defective gas valves 1. Check whether there is still burner pressure present after the

Flame detection before the gas valve opened.

The temperature at the top of the tank exceeds

Check the wiring of the flame probe. If necessary, replace the wiring.

1. Check that the ceramic part of the flame probe is still intact in the vicinity of the burner's air distribution plate.

2. If not, the flame probe must be replaced.

gas valves have closed.

2. Check whether a flame is still present after the gas valves have closed.

3. If this is the case, the gas control must be replaced.

1. Reset the electronic controller.

2. If the error reappears, replace the electronic controller.

1. Check that the circulation pump (if present) is working

2. Check the position of the temperature sensor T1.

3. Reset appliance controller

If the error persists, contact your installation engineer. To replace the necessary parts, you must contact your installation engineer

If the error cannot be resolved or is persistent, contact your installation engineer

To replace the necessary parts, you must contact your installation engineer

If the error cannot be resolved or is persistent, contact your installation engineer

To replace the necessary parts, you must contact your installation engineer

If the error cannot be resolved or is persistent, contact your installation engineer

Instruction manual BFC 77

Code + Description Cause Solution Remark

F10 (lock out error)

Restriction on the number of ignition attempts based on pressure switch state changes.

F11 (blocking error)

Pressure switch not closing

Defective gas valves See F07.

1. Check the running speed of the fan (12.5 "Display the selected

appliance")

2. Check that the hoses on the pressure switch and the air supply hose between fan and burner are correctly fitted. Refit them if necessary

3. Check for cracks in the hoses on the pressure switch and in the air supply hose between fan and burner. If necessary, replace the hoses.

4. Check that the flue gas outlet is compliant (3.9 "Air supply and

flue").

5. Check for blockage in the flue gas discharge. Remove any blockage that may be present

6. Check for blockage in the condensation water discharge. Remove any blockage that may be present.

If the error cannot be resolved or is persistent, contact your installation engineer

To replace the necessary parts, you must contact your installation engineer

Flame detection with closed gas valve.

Instruction manual BFC 78

Code + Description Cause Solution Remark

C02 (lock out error)

Error message from the appliance controller.

Internal error message from the appliance controller.

C03 (blocking error)

Reset error

C04 (blocking error)

Appliance selection error

Incorrect reference voltage from the AD converter.

• EEPROM read error

• 50 Hz error

• Internal communication error

• Gas valve relay error

• Safety relay error

• Ignition relay error

• RAM error

• EEPROM error

• EEPROM contents do not match the software version

• Processor software error

Too many resets in too short a period.

Incorrect appliance selection / Incorrect selection resistor

1. Reset electronic controller.

2. Check that the frequency of the power supply is compliant (3.4.2 "General and electrical specifications"). If this is not the case, contact your installation engineer

3. If the frequency is correct but the error persists, replace the electronic controller.

Wait for the error to disappear (maximum 1 hour). If the error does not disappear, replace the appliance controller.

1. Check whether the correct appliance is selected (12.5 "Display

the selected appliance").

2. If the correct appliance is selected, fit the correct selection resistor.

3. If incorrect appliance selected, select the correct one.

To replace the necessary parts, you must contact your installation engineer

If the error cannot be resolved or is persistent, contact your installation engineer To replace the necessary parts, you must contact your installation engineer

Instruction manual BFC 79

Code + Description Cause Solution Remark

E01 (blocking error)

The temperature protection at the top of the tank has been activated.

E03 (lock-out error)

Error in temperature sensor T the tank.

E04 (lock-out error)

Error in dummy sensor

1) Temperature sensor T (2) The dummy sensor / flue gas sensor comprises dummy sensor / flue gas sensor 1 and dummy sensor / flue gas sensor 2.

at the top of

(2)

The temperature of the water at the top of the tank is > 85

The two temperature sensors in the tank detect a differential of >

C over a period of

at least 60 seconds.

The two dummy sensors in the tank detect a differential of >

C over a period of

at least 60 seconds.

is a '2 in 1' sensor, T1 contains 2 NTCs for the high-limit thermostat and safety thermostat protection.

None. This is a temporary message that may appear from time to time, but will disappear automatically.

1. Check sensor position and wiring.

2. If necessary, reset the electronic controller. Replace the sensor if the error persists.

1. Check leads from dummy 1 and dummy 2.

2. If necessary, reset the electronic controller. Replace the dummy sensor if the error persists.

To replace the necessary parts, you must contact your installation engineer

Instruction manual BFC 80

14 Maintenance

frequency

14.1 Introduction

14.2 Determining service interval

Note

Regular maintenance extends the service life of the appliance.

To determine the correct maintenance frequency, it is recommended to arrange for the service and maintenance engineer to check the appliance on both the water and gas side, three months after installation. Based on this check, the best maintenance frequency can be determined.

To aid servicing, the electronic controller has a service interval with which the service and maintenance engineer can determine the frequency of maintenance, based on the number of burning hours.

The service interval can be set to: 500, 1000 or 1500 burning hours. The standard setting is 500 burning hours.

Example

In the first three months, the appliance has burnt 300 hours. During maintenance, it is evident that one service per year will be sufficient. Therefore, after one year, some 1200 burning hours will have elapsed. The first value below 1200 hours that can be selected is 1000 burning hours.

In this case, the service and maintenance engineer sets the interval to 1000.

In the first three months, the appliance has burned for 300 hours. During maintenance, it is evident (perhaps due to the water quality) that service will be required at least once every 6 months.

Therefore, after six months, some 600 burning hours will have elapsed. The first value below 600 hours that can be selected is 500 burning hours.

In this case, the service and maintenance engineer sets the interval to 500.

!!! WARNING !!!

MAX. BURNINGHOURS:

SERVICE REQUIRED

Once the set number of burning hours has elapsed, the message

SERVICE REQUIRED

appears, the service and maintenance engineer must be contacted.

Instruction manual BFC 81

will appear on the display. When this message

Maintenance frequency

82 Instruction manual BFC

15 Performing

maintenance

15.1 Introduction

15.2 Preparation for maintenance

Caution

Maintenance may only be performed by a qualified service and

maintenance engineer.

At each service, the appliance undergoes maintenance on both the water side and the gas side. The maintenance must be carried out in the following order.

1. Preparation for maintenance

2. Water-side maintenance

3. Gas-side maintenance

4. Finalizing maintenance

Note

To order spare parts, it is important to write down the appliance type and model, and the full serial number of the appliance. These details can be found on the rating plate. Only by ordering with this information can you be sure to receive the correct spare parts.

To test whether all components are still working properly, complete the following steps:

1. Activate the

2. Use: and to place the cursor beside

3. Confirm

MENU »OFF ^ ON È WEEK PROGRAM

OFF

with .

OFF

4. Wait until the fan has stopped. The icon is then dimmed.

Caution Failure to wait until the fan stops purging can cause damage to the

appliance.

5. Switch the appliance OFF (position 0) using the ON/OFF switch on the

control panel.

Instruction manual BFC 83

Performing maintenance

n min

0063

IMD-0423 R

6. Switch the electronic controller ON by setting the ON/OFF switch to position I.

INTERNAL CHECK

The display will now show will then go to the main menu.

MENU »OFF ^ ON È WEEK PROGRAM

7. Activate "ON mode" by going through the following steps:

- Press once on the blue arrow ( ) to position the cursor beside

then press .

- Confirm the selection

8. If there is no heat demand, increase Tset (11.3 "Setting the water

temperature"). Note the original setting. Draw some hot water off to create

heat demand.

9. Check whether the heating cycle runs correctly (9.3 "The appliance's

heating cycle").

10. If you have adjusted T

water temperature").

11. Remove the plastic cover on the top of the appliance.

12. Check the supply and burner pressure (3.11 "Checking the supply pressure

and burner pressure"), and adjust them if necessary.

13. Check that all components of the chimney flue system are properly attached.

14. Check the pressure differential across the orifice plate of the pressure switch (see the table). If the pressure difference is too low, the heat exchanger must be cleaned (15.4.4 "Cleaning the heat exchanger").

INTERNAL CHECK

START OPERATION

, return it to the desired value (11.3 "Setting the

set

for about 10 seconds, and

with .

Pressure switch pressure differential

Appliance Observed pressure differential across the pressure switch

(Pa)

BFC 80 >

BFC 100 >

15. Test the operation of the overflow valve of the protected cold supply setup. The water should spurt out.

16. Test the overflow operation of the T&P valve. The water should spurt out.

1005

114 5

84 Instruction manual BFC

0080

15.3 Water-side maintenance

17. Check the drain pipes from the discharge points of all valves and remove any lime buildup that may be present.

18. Drain the appliance (see Draining).

15.3.1 Introduction

The following steps must be carried out on the water side:

1. Checking the anodes.

2. Descaling and cleaning the tank.

3. Cleaning condensation water discharge.

15.3.2 Checking the anodes

Timely replacement of the anodes extends the service life of the appliance. The appliance's anodes must be replaced as soon as they are 60% or more consumed (take this into consideration when determining the maintenance frequency).

15.3.3 Descaling and cleaning the tank

Scale and lime buildup prevent effective conduction of the heat to the water. Periodic cleaning and descaling prevents buildup of these deposits. This increases the service life of the appliance, and also improves the heating process.

Take the rate of scale formation into account when deciding on maintenance frequency. 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 prevention of excessive scale buildup.

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). A special set is obtainable from the supplier/manufacturer.

To simplify descaling and cleaning of the tank, the appliance is equipped with two cleaning openings.

IMD-

1. Remove the cover plate (1) on the outer jacket (see the figure).

2. Undo the bolts.

3. Remove the cover and the gasket.

4. Inspect the tank and remove the loose scale deposits and contamination.

5. If the scale cannot be removed by hand, then the appliance will need to be descaled using a descaling agent. Contact the supplier for advice on the preferred descaling agent.

Instruction manual BFC 85

15.4 Gas-side maintenance

Performing maintenance

6. Close the cleaning opening. To avoid damage to the tank, tighten the bolts that fasten the lid with a torque no greater than 50 Nm. Use suitable tools for this.

15.3.4 Cleaning condensation water discharge

Regular cleaning of the condensation drain and siphon is essential for prevention of blockages.

15.4.1 Introduction

The following steps must be carried out on the gas side:

1. Clean the burner(s).

2. Clean the orifice(s).

3. Cleaning the heat exchanger.

4. Finalizing maintenance.

15.4.2 Clean the burner(s)

1. Detach the burner(s)

2. Remove all contamination present on the burner(s).

3. Fit the burner(s)

15.5 Finalizing maintenance

15.4.3 Clean the orifice(s)

1. Detach the orifice(s)

2. Remove all contamination present in the orifice(s).

3. Fit the orifice(s)

15.4.4 Cleaning the 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 flue gas discharge.

4. Clean the end of the heat exchanger using tap water.

5. Fit the burner.

6. Fit the flue gas discharge.

Note

Check the pressure differential again after cleaning. If the pressure

difference is too low following cleaning, please contact the supplier of the appliance.

To finalize the maintenance carry out the following steps:

1. Fill the appliance (5 "Filling").

2. Start the appliance (9 "Starting and running").

3. Erase the message

then once on .

SERVICE REQUIRED

. Do this by pressing once on

86 Instruction manual BFC

gis

16 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 a appliance supplied by A.O. Smith water Products Company B.V. of Veldhoven, The Netherlands (hereinafter "A.O. Smith") the right to the warranty set out below, defining the commitments of A.O. Smith to the owner.

16.1 General warranty

16.2 Tank warranty

16.3 Conditions for Installation and use

If within one year of the original installation date of a water heater supplied by A.O. Smith, following verification, and at the sole discretion of A.O. Smith, a section or part (with exclusion of the tank) proves to be defective or fails to function correctly due to manufacturing and/or material defects, then A.O. Smith shall repair or replace this section or part.

If within 3 years of the original installation date of a water heater supplied by A.O. Smith, following inspection, and at the sole discretion of A.O. Smith, the glass-lined steel tank proves to be leaking due to rust or corrosion occurring on the water side, then A.O. Smith shall offer to replace the defective water heater with an entirely new water heater of equivalent size and quality. The warranty period given on the replacement water heater shall be equal to the remaining warranty period of the original water heater that was supplied. Notwithstanding that stated earlier in this article, in the event that unfiltered or softened water is used, or allowed to stand in the water heater, the warranty shall be reduced to one year from the original installation date.

The warranty set out in article 1 and 2 will apply solely under the following conditions:

a. The water heater is installed under strict adherence to A.O. Smith

installation instructions for the specific model, and the relevant government and local authority installation and building codes, rules and regulations in force at the time of installation.

b. The water heater remains installed at the original site of installation.

c. The appliance is exclusively used with drinking water, which at all times

can freely circulate (a separately installed heat exchanger is mandatory for heating salt water or corrosive water).

d. The tank is safeguarded against harmful scaling and lime buildup by

means of periodic maintenance.

e. The water temperatures in the heater do not exceed the maximum

setting of the thermostats, which form a part of the water heater.

f. The water pressure and/or heat load do not exceed the maximum values

stated on the water heater rating plate.

g. The water heater is installed in a non-corrosive atmosphere or

environment.

h. The water heater is connected to a protected cold supply arrangement,

which is: approved by the relevant authority; with sufficient capacity for this purpose; supplying a pressure no greater than the working pressure stated on the water heater; and where applicable by a likewise approved temperature and pressure relief valve, fitted in accordance with installation instructions of A.O. Smith applying to the specific model of water heater, and further in compliance with the government and local authority installation and building codes, rules and regulations.

Instruction manual BFC 87

Warranty (certificate)

gis

i. The appliance 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 electric anodes are used, it is important to ensure that they continue to work properly.

16.4 Exclusions

16.5 Scope of the warranty

16.6 Claims

16.7 Obligations of A.O. Smith

The warranty set out in articles 1 and 2 will not apply in the event of:

a. damage to the water heater caused by an external factor;

b. misuse, neglect (including frost damage), modification, incorrect and/or

unauthorised use of the water heater and any attempt to repair leaks;

c. contaminants or other substances having been allowed to enter the tank;

d. the conductivity of the water being less than 125 µS/cm and/or the

hardness (alkaline-earth ions) of the water being less than 1.00 mmol/litre (3.3.3 "Water composition");

e. unfiltered, recirculated water flowing through or being stored in the water

heater;

f. any attempts at repair to a defective water heater other than by an

approved service engineer.

The obligations of A.O. Smith pursuant to the specified warranty do not extend beyond free delivery from the Veldhoven warehouse of the replacement sections, parts or water heater respectively. Shipping, labour, installation and any other costs associated with the replacement will not be accepted by A.O. Smith.

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 of the water heater as referred to in articles 1 and 2 shall take place in one of the laboratories of A.O. Smith water Products Company.

A.O. Smith grants no other warranty or guarantee over its water heaters nor the (sections or parts of) water heaters supplied for replacement, other than the warranty expressly set out in this Certificate.

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

88 Instruction manual BFC

17 Appendices

17.1 Introduction

This appendix contains:

• Electrical diagram (17.2 "BFC Electrical Diagram.")

• Week program card

Instruction manual BFC 89

17.2 BFC Electrical Diagram.

Appendices

1 = brown, 2 = blue, 3 = green, 4 = black, 5 = white, 6 = grey/beige, 7 = red, 8 = green

90 Instruction manual BFC

TERMINAL BLOCK CONNECTIONS:

Earth N Neutral L Phase input of controller

Phase output of isolating transformer (secondary side)

L L2Phase input of isolating transformer (primary side)

Phase input of program-controlled pump

Live input of frequency controller

L L5Phase input of continuous pump

COMPONENTS:

A Controller B Flame probe C Hot surface igniter D Gas control E Burner earth connection F Extra ON mode switch G Program-controlled pump H External error signal connection J Isolating transformer K Double-pole isolator L Controller 0/I switch M Display NFan O Temperature sensor (T2 - bottom of tank) P Dummy Q Temperature sensor (T1 - top of tank) R Selection resistor S Pressure switch T Potentiostat U Frequency controller V RS-485 interface W Electrical anodes X Signalling for electrical anodes KY Mains power choke and EMC filter

CONTROLLER CONNECTIONS:

J2 Power connection for controller J19External error signal connection J20Gas control connection J21Program-controlled pump connection J36Controller display connection J39Fan control signal connection JP2Flame probe and hot surface igniter connection JP3Temperature sensor T2 connection JP4Dummy connection JP5Temperature sensor T1 connection JP6Connection for selection resistor, pressure switch and

anode signalling JP8Extra ON mode switch connection F1 Fuse F3 Fuse

Instruction manual BFC 91

Appendices

92 Instruction manual BFC

17.3 Week program card

You can cut the week program card out and keep it near the appliance.

Period DAY TIME Tset Pump

10.

11.

OFF

....°C

ON/ OFF

Period DAY TIME Tset Pump

12.

13.

14.

15.

16.

17.

18.

19.

20.

21.

OFF

....°C

ON/ OFF

Example

Period DAY TIME Tset Pump

ON MO

OFF MO

14:30

16:15

70°C

ON/ OFF

Instruction manual BFC 93

Instruction manual BFC 94

gis

Index

ambient temperature 18 appliance

displaying history 66 displaying selection 66 general working principle 13 heating cycle 14 protection 14 types 9, 17

burner pressure 35

claims 88 connect 24, 25

air supply 26 Alarm OUT 35 circulation piping 24, 25 cold water side 24, 25 condensation drainage 24, 25 electrical 32 flue gas discharge 26 gas 26 hot water side 25 isolating transformer 34 program-controlled pump 35

Tank ON 35 Connect Alarm OUT 35 connecting air supply 26 connecting circulation pipe 24, 25 connecting cold water side 24, 25 connecting condensation drainage 24, 25 connecting flue gas discharge 26 connecting hot water side 25 connecting isolating transformer 34 connecting Tank ON 35 connecting the program-controlled pump 35 controls 57 conversion to a different gas category 39

extra period 49

operating mode 49 settings 61

fan 15 filling 41 flame probe 16 floor loading 18 forms of notation 10 frost protection 49

gas category, conversion to different 39 gas connection 26 gas control 15 general specifications 3 general working principle 13

heat demand 53 heating cycle 14, 53 humidity 18 hysteresis setting 65

icons

(pre)glow 47 explanation 47 flame detection 47 gas control 47

heat demand 47 ignition 53 installation engineer 10 isolator 34

language setting 62 liability 3

dimensions 21 display 47 displaying error history 65 document contents 11 draining 43

electrical connection 32 electrical connector block 33 environmental conditions 17 error 50

mains power 34 maintenance

burner 86

condensation water discharge 86

finalising 86

gas-side 86

heat exchanger 86

orifice 86

perform 83

preparation 83

scale 85

to descale 85

water-side 85

Instruction manual BFC 95

Index

mode

ERROR 50 EXTRA 49 HEAT DEMAND 53 IGNITION 53 OFF 49 ON 49 POST-PURGE 53 PRE-GLOW 53 PRE-PURGE 53 PRESSURE SWITCH 53 PROG 50 RUNNING 53 SERVICE REQUIRED 51

navigation buttons 47

off 49 on 49 ON mode 57 on/off switch 47 operating modes

EXTRA 49 general 49 OFF 49 ON 49 PROG 50

packaging 17 PC connection 48 post-purge 53 power cable 34 pre-glow 53 pre-purge 53 pressure switch 15, 53 prog 50 protection 14 pump 66 push buttons 47

running 53

scale 85

scrolling 47 service check 10, 81 service engineer 10 service required 51 setting backlight time 66 setting date 63 setting display contrast 66 setting display scroll speed 66 setting service interval 66 softlite 15 specifications 19 starting up 53 supply pressure 35 symbol

installation engineer 10 service engineer 10 user 10

target groups 10 temperature sensor

T1 14 T2 14

ThermoControl 47

controls 47

ON/OFF switch 47 Tnet 14 to descale 85 to shut down

electrically isolating 55

longer period 55

short period 55 trademarks 3

user 10

warranty 87

exclusions 88

general 87

installation and conditions of use 87

scope 88 water

composition 18

setting the temperature 57 week program 49

0308 454 4.2 UK

Instruction manual BFC

A.O. Smith BFC - 80, BFC -100 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

1 Introduction

3 Installation

5 Filling

6 Draining

7 The control panel

9 Starting and running

10 Shutting down

11 Main menu

12 Service program

13 Troubleshooting

16 Warranty (certificate)

17 Appendices