A.O. Smith BFM - 120, BFM - 100 User Manual

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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 .

Instruction manual BFM 3

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4 Instruction manual BFM

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Table of contents

1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - 7

1.1 About the appliance - - - - - - - - - - - - - - - - - - - - - - - - - - - - 7

1.2 What to do if you smell gas- - - - - - - - - - - - - - - - - - - - - - - - - 7

1.3 Regulations - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 7

1.4 Maintenance - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8

1.5 Forms of notation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8

1.6 Target groups - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8

1.7 Overview of this document - - - - - - - - - - - - - - - - - - - - - - - - - 9

2 Working principle of the appliance- - - - - - - - - - - - - - - 11

2.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 11

2.2 General working principle of the appliance - - - - - - - - - - - - - - - - 11

2.3 The appliance's heating cycle - - - - - - - - - - - - - - - - - - - - - - 13

2.4 Protection for the appliance - - - - - - - - - - - - - - - - - - - - - - - 13

2.5 Safety of the installation - - - - - - - - - - - - - - - - - - - - - - - - - 15

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

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

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

3.3 Ambient 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 - - - - - - - - - - - - - - - - - - - - - - - - - - - - 27

3.10 Electrical connection - - - - - - - - - - - - - - - - - - - - - - - - - - - 34

3.11 Checking the supply pressure and burner pressure - - - - - - - - - - - - 36

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

4.1 Conversion - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 39

4.2 Orifice replacement - - - - - - - - - - - - - - - - - - - - - - - - - - - 40

4.3 Replacement of burner pressure regulator or blank plate BFM30-50-80-100 41

5 Filling - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 43

5.1 Filling unvented installations - - - - - - - - - - - - - - - - - - - - - - - 44

5.2 Filling vented installations - - - - - - - - - - - - - - - - - - - - - - - - 44

6 Draining - - - - - - - - - - - - - - - - - - - - - - - - - - - - 45

6.1 Draining unvented installations - - - - - - - - - - - - - - - - - - - - - - 46

6.2 Draining vented installations - - - - - - - - - - - - - - - - - - - - - - - 47

7 The control panel- - - - - - - - - - - - - - - - - - - - - - - - 49

7.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 49

7.2 Control panel - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 49

7.3 Explanation of icons - - - - - - - - - - - - - - - - - - - - - - - - - - - 49

7.4 ON/OFF switch - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 49

7.5 Control thermostat - - - - - - - - - - - - - - - - - - - - - - - - - - - - 49

7.6 Burner control reset button - - - - - - - - - - - - - - - - - - - - - - - - 50

Instruction manual BFM 5

Table of contents

8 Status of the appliance - - - - - - - - - - - - - - - - - - - - - 51

8.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 51

8.2 Operating modes - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 51

8.3 Error conditions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 51

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

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

9.2 Starting the appliance - - - - - - - - - - - - - - - - - - - - - - - - - - - 53

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

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

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

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

10.3 Isolating the appliance from the mains - - - - - - - - - - - - - - - - - - - 55

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

11 Troubleshooting - - - - - - - - - - - - - - - - - - - - - - - - 57

11.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 57

11.2 Troubleshooting: general errors - - - - - - - - - - - - - - - - - - - - - - 58

11.3 Troubleshooting: insufficient hot water - - - - - - - - - - - - - - - - - - - 59

11.4 Troubleshooting: No hot water- - - - - - - - - - - - - - - - - - - - - - - 60

12 Performing maintenance - - - - - - - - - - - - - - - - - - - - 63

12.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 63

12.2 Preparation for maintenance - - - - - - - - - - - - - - - - - - - - - - - 63

12.3 Water-side maintenance - - - - - - - - - - - - - - - - - - - - - - - - - 64

12.4 Gas-side maintenance - - - - - - - - - - - - - - - - - - - - - - - - - - 66

12.5 Finalising maintenance - - - - - - - - - - - - - - - - - - - - - - - - - - 66

13 Warranty (certificate) - - - - - - - - - - - - - - - - - - - - - - 67

13.1 General warranty - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 67

13.2 Tank warranty- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 67

13.3 Conditions for Installation and use - - - - - - - - - - - - - - - - - - - - - 67

13.4 Exclusions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 68

13.5 Scope of the warranty - - - - - - - - - - - - - - - - - - - - - - - - - - - 68

13.6 Claims - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 68

13.7 Obligations of A.O. Smith - - - - - - - - - - - - - - - - - - - - - - - - - 68

14 Electrical diagram - - - - - - - - - - - - - - - - - - - - - - - 69

14.1 Introduction - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 69

14.2 BFM Electrical Diagram.- - - - - - - - - - - - - - - - - - - - - - - - - - 70

6 Instruction manual BFM

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0063

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 BFM appliance. The BFM appliance is a gas-fired sealed boiler with a fan in the air supply. The parallel or concentric chimney connections are appliance-dependent. Possible installation types are C13 or C33. The information in this manual applies to the: BFM 30, BFM 50, BFM 80, BFM 100 and BFM 120.

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!

Open windows and doors!

1.3 Regulations

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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Introduction

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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 Maintenance

1.5 Forms of notation

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.

The following notation is used in this manual:

Note

Important information.

Caution

Ignoring this information can lead to the appliance being damaged.

1.6 Target groups

Warning

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

serious damage to the appliance.

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

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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 operation 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 and explains how to use the control panel.

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.

Troubleshooting This chapter is mainly intended for the installation

engineer and the service and maintenance engineer. It describes appliance errors. A table is included stating potential symptoms, causes and solutions. End users may also refer to this chapter for additional information about the appliance.

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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Introduction

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10 Instruction manual BFM

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2 Working principle of

the appliance

2.1 Introduction

2.2 General working principle of the appliance

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.

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Working principle of the appliance

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Cut-away view of the appliance

Legend

Only applicable numbers are mentioned.

2. hot water outlet

5. pressure switch

8. combustion chamber

9. anode

10. tank

11. heat exchanger

12. inspection and cleaning opening

14. cold water inlet

15. drain valve

16. gas control

18. fan

21. flame probe

22. chimney pipe

24. insulation layer

36. bar burners/burner tray

38. safety thermostat sensor

39. high-limit thermostat sensor

40. burner control

41. control thermostat

42. high-limit thermostat

IMD-0240 R2

43. safety thermostat

44. frost thermostat

45. control thermostat sensor

46. frost thermostat sensor

47. air supply

49. air restrictor 50 combustion chamber with

air distribution plate

51. pilot burner

52. spark igniter

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In this appliance, the cold water enters the bottom of the tank through the cold water inlet (14). The heat of combustion is conducted to the water by the combustion chamber (50) and heat exchanger (11). The heated tap water leaves the tank through the hot water outlet (2). Once the appliance is completely filled with water, it will constantly be under mains water pressure. When hot water is drawn from the appliance, it is immediately replenished with cold water.

The air required for combustion is forced into the combustion chamber by the fan.

The gas required for combustion flows via the gas control (16) in the manifold. The gas control for the BFM 120 is non-standard (see box). Orifices are mounted in the manifold. The gas is injected into the burner bars at pressure from these orifices (36). The burner bars together form the burner tray. The injection of gas into the burner bars also draws in the primary air from the combustion chamber, which is required for combustion. The narrow opening in the orifice causes the gas flow to accelerate. This in turn causes a partial vacuum. It is this partial vacuum that draws in the air (the Venturi effect).

Ignition of the gas/air mixture takes place in two stages. First, the pilot flame is ignited by a spark igniter. This pilot flame then ensures that the complete ignition takes place.

The flue gases released by this combustion are led through the heat exchanger. The heat exchanger is composed of flue tubes that contain flue baffles. These retard the flow of the flue gases, thereby increasing the thermal efficiency of the appliance.

The flue gases are exhausted from the appliance via the top box (46). The top box of the BFM 100 and 120 is non-standard (see box).

An air distribution plate (50) mounted below the burner tray radiation shield also serves as a radiation shield. Any condensation that forms is drained towards the siphon via the air distribution plate.

The PU insulation layer (24) prevents heat loss. The inside of the tank is enamelled to protect against corrosion. The anodes (9) offer extra protection.

2.3 The appliance's heating cycle

2.4 Protection for the appliance

2.4.1 Introduction

The entire appliance is controlled by the burner control (40) and the control thermostat (41) or frost thermostat (44). The control thermostat and frost thermostat both independently measure the water temperature (T appliance's heating cycle is activated as soon as T value (T appliance (8.2 "Operating modes"). When the appliance is in OFF mode (frost protection), this value is determined by the frost thermostat (threshold value = 20°C). When the appliance is in ’ON mode’, the threshold value can be set via the control thermostat (±40°C - ±70°C).

The instant T will close, and the burner control will identify a heat demand. The gas control will open, and the gas will mix with air. This mixture is ignited by the spark igniter, and the water becomes heated. As soon as T thermostats will open once more. The heat demand is suspended, and the burner control stops the heating cycle.

The thermostats have a certain margin both when opening and when closing. We refer to this margin as hysteresis. The hysteresis cannot be adjusted.

The burner control monitors the water temperature by means of thermostats, and ensures that the combustion is safe. This takes place using:

). The value of T

set

falls below T

water

depends on the selected mode of the

set

, the appropriate thermostat (control or frost)

set

water

falls below the threshold

water

rises above T

water

set

). The

, the

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Working principle of the appliance

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• the Water temperature protection;

• the Flame probe;

• the Pressure switch.

2.4.2 Water temperature protection

By means of the frost, high-limit and safety thermostats, the burner control monitors three temperatures that are important for safety. The table explains the working principle of the thermostats with sensors.

Temperature protection

Protection Description

Frost thermostat When the frost thermostat sensor (46) measures a temperature of 20°C or

less, the heating cycle (2.3 "The appliance's heating cycle") will start.

High-limit thermostat When the high-limit thermostat sensor (39) measures a temperature higher

than 84°C, the high-limit thermostat will open. The heat demand is terminated and the burner control halts the heating cycle until the high-limit thermostats close once more. At that moment the burner control will reset the appliance and the heating cycle will restart. The high-limit safeguard serves to prevent overheating and/or excessive formation of scale in the appliance.

Safety thermostat When the safety thermostat sensor (38) measures a temperature higher than

93°C, the safety thermostat will open. The heat demand is terminated and the burner control will immediately halt the heating cycle. The burner control will go into a lockout error state. This must be manually reset before the appliance can resume operation.

2.4.3 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

BFM 30

BFM 50

BFM 80

BFM 100

BFM 120

> 200 Pa < 170 Pa

> 270 Pa < 240 Pa

> 255 Pa < 225 Pa

> 610 Pa < 580 Pa

> 220 Pa < 190 Pa

Opening pressure difference

2.4.4 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 burner control uses the ionisation-detecting properties of this probe for flame detection. The burner control closes the gas valve the instant it determines that there is a gas flow but no flame is present.

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2.5 Safety of the installation

2.5.1 Unvented installation

2.5.2 Vented installation

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.

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").

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 (3.7.3 "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 (3.7.3 "Hot water side").

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16 Instruction manual BFM

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 Ambient conditions

This chapter describes the installation activities to be carried out before the appliance may be started up (9 "Starting and running"), in particular:

• Packaging;

• Ambient conditions;

• Technical specifications;

• Water connections, Vented;

• Gas connection;

• Air supply and flue;

• Electrical connection;

• Checking the supply pressure and burner pressure.

For a possible 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 has a sealed combustion chamber, and obtains its air supply independently of the boiler room. There are therefore no additional ventilation requirements.

Possible installation types are C13 and C33.

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 <

Instruction manual BFM 17

T < 60°C

Installation

3.3.2 Maximum floor load

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

Weight of the appliance filled with water

BFM 30 BFM 50 BFM 80 BFM 100 BFM 120

539 kg 543 kg 548 kg 573 kg 573 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.

Water specifications

Water composition

Hardness (alkaline earth ions)

Conductivity > 125 µS/cm

Acidity (pH value) 7.0 < pH value < 9.5

> 1.00 mmol/l:

• German hardness> 5.6° dH

• French hardness > 10.0° fH

• English hardness > 7.0° eH

Note

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

tank protection cannot be guaranteed (13 "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.

• Above the appliance (room to replace the anodes):

- 100cm if using fixed anodes, or

- 50cm if using flexible anodes.

If the available clearance is less than 100cm, flexible magnesium anodes may be ordered.

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, 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 5cm greater than the diameter of the appliance.

18 Instruction manual BFM

Working clearances

3.4 Technical specifications

IMD-0241 R1

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.

Instruction manual BFM 19

005

Installation

3.4.1 Dimensions of the appliance

Plan and elevation of the appliance

10º

4/6

37º

45º

G/L

10º

4/6

45º

37º

IMD-

7 R

Replacement of burner pressure regulator or blank plate BFM30-50-80-100 (2) = BFM 100, 120

20 Instruction manual BFM

Dimensions (all measurements in mm unless otherwise indicated)

Dimens

Description BFM30 BFM50 BFM80 BFM100 BFM120

ion

A Total height 2000 2000 2020 2020 2020

B Height of top of appliance 1800 1800 1820 1820 1820

C Position on pallet 580 580 580 580 580

D Appliance diameter 710 710 710 710 710

E Depth 1000 1000 1000 1000 1000

F Width 755 755 755 755 755

G Diameter of chimney flue 80 100 130 130 130

Hy y-position air supply - - - 235 235

K Height of gas connection 600 600 600 600 760

L Diameter of Air supply 125 150 200 130 130

M Height of cold water supply 600 600 590 590 590

N Height of hot water outlet 1640 1640 1655 1655 1655

P Height of cleaning opening 770 770 760 760 760

R Height of drain valve connection 550 550 540 540 540

S Height of T&P valve connection 1600 1600 1600 1600 1600

1 Cold water supply connection (external) R1

2 Hot water outlet connection (internal) Rp11/

3 Gas control connection (internal) Rp3/

4 Drain valve connection (internal) Rp1

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

NPT

R11/

Rp11/

Rp3/

Rp11/

1 - 11.5 NPT

R11/

Rp11/

Rp3/

Rp11/

R11/

Rp11/

Rp3/

Rp11/

R11/

Rp11/

Rp1

Rp11/

6 Cleaning/inspection opening Ø 100 Ø 100 Ø 100 Ø 100 Ø 100

3.4.2 General and electrical specifications

General and electrical specifications

DESCRIPTION Unit BFM

Volume litres 309 298 253 253 253

Maximum operating pressurebar88888

Empty weight kg 230 245 295 320 320

Heating-up time ΔT=45

C minutes 37 22 12 9 8

Diameter of air restrictor mm 36 42 54 48 64

Number of anodes - 2 2444

Number of bar burners/orifices- 35777

Number of flue tubes/flue baffles - 5 7 16 16 16

Electrical power consumption W 100 100 100 275 300

Supply voltage

volts 230 230 230 230 230

(-15% +10% VAC)

Mains frequency Hz (± 1Hz) 50 50 50 50 50

IP class - 20 20 20 20 20

BFM 50

BFM 80

BFM 100

BFM 120

Instruction manual BFM 21

Installation

3.4.3 Gas data

Gas data

Description Unit BFM

Gas category: 30 through 100 II

Natural gas G20 - 20 mbar

Orifice diameter mm 2.60 2.50 2.70 3.20 3.30

Diameter of pilot flame orifice mm 0.56/0.41 0.56/0.41 0.56/0.41 0.56/0.41 0.56/0.41

(1) = Blank plate (2) = Burner pressure regulator

Nominal load (upper value) kW 32.2 52.2 83.3 113.3 127.7

Nominal output kW 26.4 42.3 67.5 90.8 102.4

Supply pressure mbar 20 20 20 20 20

Burner pressure

Gas consumption

LP gas data

G30 - 30 mbar (butane)

Orifice diameter mm 1.45 1.40 1.50 1.95 n.a.

Diameter of pilot flame orifice mm 0.25 0.25 0.25 0.25

(1) = Blank plate (2) = Burner pressure regulator

Nominal load (upper value) kW 31.4 49.9 81.3 110.5

Nominal output kW 26.4 41.4 67.5 90.8

Supply pressure mbar 30 30 30 30

Burner pressure

Gas consumption

G31 - 37mbar (propane)

Orifice diameter mm 1.45 1.40 1.50 1.95 2.30

Diameter of pilot flame orifice mm 0.25 0.25 0.25 0.25 0.25

(1) = Blank plate (2) = Burner pressure regulator

Nominal load (upper value) kW 30.4 47.8 77.2 110.9 125.0

Nominal output kW 25.5 39.6 63.9 90.8 102.4

Supply pressure mbar 37 37 37 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.

(†)

(*)

(†)

(*)

(†)

(*)

, 120: II

2H3+

1 or 222222

mbar 12.5 12.9 12.9 12.5 14.0

m3/h 3.1 5.0 7.9 10.8 12.2

1 or 21111

mbar----

kg/h 2.3 3.6 5.9 8.0

1 or 211112

------22.0

kg/h 2.2 3.4 5.5 7.9 8.9

2H3P

BFM 50

BFM 80

BFM 100

BFM 120

22 Instruction manual BFM

3.5 Installation diagram

3.5.1 Installation

Legend

Only applicable numbers are

mentioned.

1. pressure reducing valve

(mandatory)

3. T&P valve (mandatory)

4. stop valve (recommended)

5. non-return valve (mandatory)

6. circulation pump (optional)

7. top to bottom circulation pump

(optional)

9. drain valve

10. manual gas valve (mandatory)

11. service stop valve (mandatory)

12. temperature gauge

(recommended)

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

This figure shows the installation diagram. This diagram is used in the sections in which the actual connection process is described.

Installation diagram

UNVENTED

14 14 14

7 5

451

IMD-0467 R

VENTED

645

Instruction manual BFM 23

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