80
100
Installation
User and
Service Manual
XTRA HIGH EEFFICCIIENCY
WATER PRODUCTS
COMPANY
A DIVISION OF A. O. SMITH CORPORATION
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Read this manual carefully
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.
Copyright © 2008 A.O. Smith water Products Company
All rights reserved.
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.
Trademarks
Liability
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.
If you have any comments or queries concerning any aspect related to the
appliance, then please do not hesitate to contact:
More information
A.O. Smith water Products Company
PO Box 70
5500 AB Veldhoven
Netherlands
Telephone:
(free) 0870 - AOSMITH
0870 - 267 64 84
General:
Fax:
+31 40 294 25 00
+31 40 294 25 39
E-mail :
Website:
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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Table of contents
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Table of contents
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1 Introduction
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.
1.1 About the appliance
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:
1.2 What to do if you
smell gas
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!
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:
1.3 Regulations
•
•
•
•
•
•
•
•
•
•
•
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.
The three target groups for this manual are:
1.4 Target groups
•
•
•
(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.
1.5 Maintenance
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:
1.6 Forms of notation
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
document
The table provides an overview of the contents of this document.
Contents of this document
Chapter
Target groups
Description
This chapter describes how the appliance functions.
This chapter describes the installation activity to be
completed before you actually start up the appliance.
This chapter describes how to fill the appliance.
This chapter describes how to drain the appliance.
This chapter describes the general control of the
appliance using the display.
This chapter describes the status (mode or condition) that
the appliance may have, and possible actions to take.
This chapter describes how to start the appliance running.
The general heating cycle of the appliance is also
described.
This chapter describes how to shut the appliance down for
a brief or long period of time.
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.
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.
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.
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.
This chapter sets out the maintenance tasks to be carried
out during a service.
This chapter states the warranty terms and conditions.
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Introduction
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2 Working principle of
the appliance
Topics covered in this chapter:
2.1 Introduction
•
•
•
•
The figure shows a cut-away view of the appliance.
2.2 General working
principle of the
appliance
Cut-away view of the appliance
19
5
Legend
1
Only applicable numbers are
mentioned.
25
2
1. cover
4
2. hot water outlet
3. electrical connector block
4. electronic controller
5. pressure switch
6. control panel
26
27
7
6
28
3
7. temperature sensor T
8. combustion chamber
9. anode
1
16
9
8
10. tank
11. heat exchanger
18
20
17
10
11
12. inspection and cleaning opening
13. temperature sensor T
14. cold water inlet
15. drain valve
2
22
21
16. gas control
17. burner
18. fan
12
13
19. air supply hose
20. hot surface igniter
21. flame probe
22. chimney pipe
23. siphon
14
15
23
24. insulation layer
25. mains power choke
26. EMC filter
24
29
27. frequency controller
28. potentiostat
29. pallet
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
<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
.
net
The value of T lies between the temperatures at the top and bottom of the
net
tank. As soon as
falls below the set water temperature (T ), the electronic
Tnet
set
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
rises above T the heat demand
Tnet
set
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
2.4 Protection for the
appliance
2.4.1 Introduction
The electronic controller monitors the water temperature and ensures safe
combustion. This is achieved by:
•
•
•
14
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•
•
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
The frost protection cuts in. The water is heated to 20°C.
(T1 < 5°C or T2 < 5°C)
For maximum water temperature The high-limit safeguard serves to prevent overheating and/or excessive
(T1 > 85°C or T2 > 85°C)
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.
For extra safety
(T1 > 93°C or T2 > 93°C)
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
1
2.4.3 Gas valve
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
> 1005 Pa
> 1145 Pa
< 975 Pa
BFC 100
< 1115 Pa
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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.
2.5 Safety of the
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.
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 non-
return 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
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
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
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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
This chapter describes the installation activities to be carried out before you
3.1 Introduction
•
•
•
•
•
•
•
•
•
In the event of conversion to a different gas category, see
To avoid damaging the appliance, remove the packaging carefully.
We recommend unpacking the appliance at or near its intended location.
3.2 Packaging
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.
3.3 Environmental
conditions
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.
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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
Functional: 0 < T < 60°C
Ambient temperature
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.
Water specifications
Water composition
Hardness
> 1.00 mmol/l:
(alkaline earth ions)
•
•
•
German hardness> 5.6° dH
French hardness > 10.0° fH
English hardness > 7.0° eH
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
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.
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Dimensions (all measurements in mm unless otherwise indicated)
Dimen Description
sion
BFC 80
BFC 100
A
Total height
2060
530
2060
530
C
D
E
Position on pallet
Appliance diameter
850
850
Depth
1000
900
1000
900
F
Width
G
H
Hx
Hy
K
Diameter of flue gas outlet
Height of flue gas outlet/air supply
x position of flue gas outlet
y position of flue gas outlet
Height of gas connection
Height of cold water supply
Height of hot water outlet
y position of hot water outlet
Height of cleaning opening
Height of drain valve connection
Height of T&P valve connection
Height of condensation drain
Cold water supply connection (external)
Hot water outlet (external)
Gas control connection (internal)
Drain valve connection (internal)
T&P valve connection (internal)
Cleaning/inspection opening
Condensation drainage connection (internal)
130/200
2015
310
130/200
2015
310
440
440
1855
225
1855
225
M
N
Ny
P
2060
205
2060
205
290
290
R
S
225
225
1425
1425
W
1
240
240
1
1
R1 /
R1 /
2
2
4
2
2
4
1
1
2
R1 /
R1 /
3
3
3
Rp /
Rp /
3
3
4
/ "
/ "
4
4
5
1 - 11.5 NPT
95x70
1 - 11.5 NPT
95x70
6
7
Rp1
Rp1
3.4.2 General and electrical specifications
General and electrical specifications
Unit
DESCRIPTION
BFC 80
BFC 100
Content
litres
kg
460
480
8
460
480
8
Empty weight
Maximum operating pressure
Number of anodes
bar
-
2
2
Fan rotational speed at ignition
Operational speed of fan
Diameter of air restrictor
rpm
rpm
mm
minutes
W
2790
5100
36.0
18
3120
5700
38.0
14
o
Heating-up time ∆T = 45 C
Electrical power consumption
600
230
690
230
Supply voltage
volts
(-15% +10% VAC)
Mains frequency
IP class
Hz (± 1Hz)
-
50
30
50
30
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Installation
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3.4.3 Gas data
Gas data
Description II
Natural gas
Unit
BFC 80
BFC 100
2H3P
Gas category G20-20 mbar
Orifice diameter
mm
kW
6.30
86.6
81.9
20
6.80
105.5
99.8
20
Nominal load (gross calorific value)
Nominal output
kW
Supply pressure
mbar
mbar
Burner pressure
7.0
6.0
(*)
3
Gas consumption
m /h
8.3
10.1
LP gas
Gas category G31-37mbar (propane)
Orifice diameter
mm
kW
4.70
84.8
81.9
37
5.10
103.3
99.8
37
Nominal load (gross calorific value)
Nominal output
kW
Supply pressure
mbar
mbar
kg/h
(†)
Burner pressure
13
13
(*)
Gas consumption
6.1
7.4
(*) 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.
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3.5 Installation diagram
Installation diagram
Legend
UNVENTED
Only applicable numbers are
mentioned.
14
14
14
1. pressure reducing valve
(mandatory)
B
11
3. T&P valve (mandatory)
12
4. stop valve (recommended in
pipe C and mandatory in pipe A)
10
D
5. non-return valve (mandatory)
6. circulation pump (optional)
9. drain valve
4
3
10. manual gas valve (mandatory)
11. service stop valve
6
5
4
12. temperature gauge (optional)
13. condensation drainage
14. hot water draw-off points
15. expansion valve (mandatory)
16. expansion vessel (mandatory)
C
16
5
1
4
A
17. 3-way aeration valve
(recommended)
15
9
18. water tank
13
19. float valve
A. cold water supply
B. hot water supply
C. circulation pipe
D. gas supply
VENTED
17
H
19
A
E
4
E. overflow pipe
H. overflow pipe
14 14 14
18
11
B
C
12
D
10
3
4
4
5
6
4
C
9
13
IMD-0465 R1
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Installation
Warning
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3.6 Water connections,
Vented
The installation should be carried out by an authorised installation engineer,
3.6.1 Cold water side
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
3.6.2 Hot water side
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
3.6.3 Circulation pipe
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.
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3.7 Water connections,
Unvented
Warning
The installation should be carried out by an authorised installation engineer,
3.7.1 Cold water side
1. Fit an approved stop valve (4) on the cold water side as required by
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.
3.7.2 Hot water side
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
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.
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Warning
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3.8 Gas connection
The installation should be carried out by an authorised installation engineer,
Caution
Make sure that the diameter and length of the gas supply pipe are large
enough to supply sufficient capacity to the appliance.
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.
3.9 Air supply and flue
3.9.1 Introduction
This section covers the following subjects:
•
•
•
3.9.2 Requirements for flue gas discharge materials
Warning
The installation should be carried out by an authorised installation engineer,
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.
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Types of appliances
C43
B23
C33
C13
C53
IMD-0468 R0
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Explanation of type of appliance
Type of appliance
Description
B23
C13
C33
C43
Air for combustion is drawn from the boiler room.
Concentric and / or parallel wall flue terminal
Concentric and / or parallel roof flue terminal
Appliances on common air supply and flue gas discharge (concentric and / or
parallel) in multi-storey building.
C53
C63
Air supply and flue terminal types mixed.
Appliances supplied without flue components and / or terminal. These
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.
3.9.3 Concentric connections
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
130/200mm
15m
15m
3
3
BFC 100
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.
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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.
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Concentric wall flue terminal specifications C13
Subject
Wall flue terminal set:
Description
1
Item No.
0302 326
•
1x wall flue terminal (incl. wall flange &
clamping ring)
Construction
Manufacturer
Type
Concentric
Muelink & Grol
M2000 MDV SEC
•
•
1x pipe 500mm
1x bend 90°
Pipe material
Construction
Concentric
Flue gas
Thick-walled aluminium with lip ring seal
discharge
Air supply
Thin-walled galvanised sheet steel
Ø 130mm
Pipe diameters
Flue gas
discharge
Air supply
Ø 200mm
1
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
Subject
Description
1
Roof flue terminal set:
Item No.
0306 855
•
1x wall flue terminal (incl. clamping
ring)
Construction
Manufacturer
Type
Concentric
Muelink & Grol
M2000 DDV SEC
•
•
1x pipe 1000mm
1x mounting flange
Pipe material
Construction
Concentric
Flue gas
Thick-walled aluminium with lip ring seal
discharge
Air supply
Thin-walled galvanised sheet steel
Ø 130mm
Pipe diameters
Flue gas
discharge
Air supply
Ø 200mm
1
No other wall flue terminal is permitted. Use this item number to order the wall conduit set from supplier,
manufacturer or wholesaler.
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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
1
Appliance
Diameter
Maximum
L
L
equivalent
equivalent
total length
90° bend
45° bend
BFC 80
BFC 100
BFC 80
BFC 100
130mm
130mm
150mm
150mm
115m
60m
2.4m
1.4m
2.4m
1.4m
115m
100m
2.6m
1.6m
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
for
equivalent
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.
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.
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Appliance with parallel flue gas discharge material
3
2
4
5
1
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
3.10 Electrical
connection
The installation should be carried out by an authorised installation engineer,
3.10.1 Introduction
Topics covered in this paragraph:
•
•
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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:
•
•
•
•
Note
The optional components are not included in the rating for electrical power
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
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
Legend
A. screws
A
B. protective cap
C. connector block
B
A
24
C
1
IMD-0224 R3
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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
Program-
controlled
pump
Circulation
pump
Frequency
controller
Tank
ON
Mains
voltage
Alarm Off
Isolating transformer
primary secondary
-
L
N
4
L
N
7
X
X
N
L
X
X
N
L
N
L
1
L
N
5
4
3
4
3
1
2
2
1
2
3
5
6
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
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
2
at least 3 x 1.0 mm .
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
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
3. Fit the cables in the strain relief.
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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
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 and X ) to points 8 and 9 according to the
3
4
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.
3.10.7 Connecting an extra error signal ('Alarm OUT' )
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 and X ) to terminals 13 and 14 according to
1
2
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
3.11 Checking the supply
pressure and burner
pressure
Before starting the appliance and/or checking the supply pressure and
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.
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Gas control
Legend
Only applicable numbers are
mentioned.
4
3
5
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
2
1
IMD-0260 R1
3.11.1 Preparation
To check the supply pressure and burner pressure, proceed as follows:
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.
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n
min
0063
IMD-0423 R0
The display will now show INTERNAL CHECKfor about 10 seconds and
go to the main menu.
INTERNAL CHECK
MENU
»OFF
^ ON
È WEEK PROGRAM
7. Activate the "ON mode" by going through the following steps:
-
Press the blue arrow once ( ) to position the cursor in front of ONand
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 RUNNINGyou 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
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
If the burner pressure is not correct and the appliance is fitted with a blank plate,
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
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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
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 MENUis not displayed:
press
.
-
-
Use and to place the cursor beside OFF
.
Confirm with
.
8. Wait until the fan has stopped, and switch the electronic controller off.
Caution
Failure to wait until the fan stops can cause damage to the appliance.
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.
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4 Conversion to a
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
Legend
Unused numbers are not applicable
2. three-part gas coupling
6. orifice with stamped figures
6
2
IMD-0225 R2
2. Shut off the gas supply.
3. Undo the screws of the plastic covers.
4. Carefully remove the covers from the appliance.
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Conversion to a different gas category
is
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
(6).
7. Refit the 3-part gas coupling (2).
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.
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5 Filling
Installation diagram
Legend
UNVENTED
Only applicable numbers are
mentioned.
14
14
14
B
1. pressure reducing valve
(mandatory)
11
12
3. T&P valve (mandatory)
10
D
4. stop valve (recommended in
pipe C and mandatory in pipe A)
5. non-return valve (mandatory)
6. circulation pump (optional)
9. drain valve
4
3
6
5
4
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)
C
16
5
1
4
A
15
9
17. 3-way aeration valve
(recommended)
13
18. water tank
19. float valve
VENTED
A. cold water supply
B. hot water supply
C. circulation pipe
D. gas supply
17
H
19
A
E
4
14 14 14
18
11
B
C
E. overflow pipe
H. overflow pipe
12
D
10
3
4
4
5
6
4
C
9
13
IMD-0465 R1
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5.1 Filling the appliance
5.1.1 Filling unvented 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 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.
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6 Draining
Installation diagram
Legend
UNVENTED
Only applicable numbers are
mentioned.
14
14
14
B
1. pressure reducing valve
(mandatory)
11
12
3. T&P valve (mandatory)
10
D
4. stop valve (recommended in
pipe C and mandatory in pipe A)
5. non-return valve (mandatory)
6. circulation pump (optional)
9. drain valve
4
3
6
5
4
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)
C
16
5
1
4
A
15
9
17. 3-way aeration valve
(recommended)
13
18. water tank
19. float valve
VENTED
17
H
A. cold water supply
B. hot water supply
C. circulation pipe
D. gas supply
19
A
E
4
14 14 14
18
11
B
C
E. overflow pipe
H. overflow pipe
12
D
10
3
4
4
5
6
4
C
9
13
IMD-0465 R1
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Draining
gis
6.1 Draining unvented
installations
1. Activate the MENUwith
.
MENU
»OFF
^ ON
È WEEK PROGRAM
2. Position the cursor in front of OFF
3. Confirm OFFwith
.
.
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.
n
min
0063
IMD-0423 R0
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.
6.2 Draining vented
installations
1. Activate the MENUwith
2. Position the cursor in front of OFF
3. Confirm OFFwith
.
.
.
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.
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n
min
0063
IMD-0423 R0
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.
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Draining
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7 The control panel
7.1 Introduction
Topics covered in this chapter:
a
•
•
•
•
•
»START OPERATION
^ CHANGE SETPOINT
È
Tset=70ÉC
7.3 Meaning of icons
The table explains the meanings of the icons.
7.2 Controls
<The entire appliance is controlled (and monitored) by
the ThermoControl (electronic controller).The figure
shows the electronic controller.
Icons and their meaning
Name
Meaning
Heat demand
Purge
Heat demand detected
Pre- and post-purge using
fan
n
min
Pressure switch Pressure switch is closed
Glowing
(Pre)glow
0063
Gas control
Gas control open/ignition
Flame detection Appliance operational
7.4 Electronic controller ON/OFF switch
IMD-0423 R0
The control panel is completely menu-driven, and
comprises:
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.
•
•
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.
INTERNAL CHECK
The pushbuttons are divided into three groups:
After switching on, the text INTERNAL CHECK
appears on the display for about 10 seconds. Themain
is made in the main menu, the appliance automatically
•
Navigation buttons:
-
-
-
Buttons for UP , and DOWN
;
Enter:
;
Reset button:
Note
•
•
;
To electrically isolate the appliance, you must use
the isolator between the appliance and the mains
power supply.
.
This chapter is specifically intended for the service
and maintenance engineer and installation
engineer.
7.5 Navigation buttons
In this manual, the display of the electronic controller
is shown as in the figure, both with and without icons.
The use of these buttons is explained with the help of
the figure that shows the main menu (11 "Main
The navigation buttons are:
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The control panel
gis
•
•
•
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: OFF
WEEK PROGRAM EXTRA PERIODand
SETTINGS. You have to scroll down further to see the
,
ON,
,
options EXTRA PERIODand SETTINGS
.
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.
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.
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8 Status of the
appliance
•
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
8.1 Introduction
Topics covered in this chapter:
•
•
•
HEAT DEMAND
.
ON
13:45 Thursday 67ÉC
Tset 75ÉC
8.2 Operating modes
When running, the appliance has four basic operating
modes, namely:
8.2.3
EXTRA
•
•
•
•
OFF
In this mode, one extra period is programmed and
activated. In this mode, the OFForPROGmode is
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:
ON
EXTRA
PROG
8.2.1
OFF
In this mode, the frost protection is activated. The
figure shows the display with the following information:
•
•
line one: the text EXTRA
line two: the time, the day and alternately (9.3 "The
;
•
•
line one: the text OFF
;
;
net
1
line two: the time, the day and alternately (9.3 "The
•
•
line three: the switch-on time, and the related
water temperature setting;
.
net
1
•
lines three and four: the text
FROST PROTECTION ACTIVATED
line four: the text PERIOD ACTIVATED
.
.
EXTRA
OFF
12:30 Thursday 76ÉC
TH 12:45 Tset 75ÉC
PERIOD ACTIVATED
13:45 Thursday 6ÉC
FROST PROTECTION
ACTIVATED
8.2.2
ON
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
;
.
net
1
•
line three: the programmed water temperature
T
;
set
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Status of the appliance
gis
8.2.4
PROG
8.3 Error conditions
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:
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;
PROG
•
lines two to four: alternately, a brief explanation of
the error, and a brief action to resolve the error.
10:00 Monday
76ÉC
MO 11:15 Tset 75ÉC
S04: SENSOR ERROR
1. The current time falls within a set time period
CHECK
SENSOR OR DUMMY
of the week program.
The figure shows the display with the following
information:
-
-
line one: the text PROG
;
Caution
line two: the time, the day and T and T
alternately (9.3 "The appliance's heating
1
net
The displayed action to resolve the error may only
be performed by a service and maintenance engineer.
-
-
line three: the next scheduled switch-off time
There are various types of errors:
and the water temperature T of the active
set
•
•
LOCK OUT ERRORS
period;
When the cause has been removed, these errors
require a reset with the button
appliance can resume operation.
line four: is empty, or depending on the
heating cycle (9.3 "The appliance's heating
before the
.
BLOCKING ERRORS
PROG
12:00 Monday
MO 11:15
These errors disappear automatically once the
cause of the error has been removed, after which
the appliance resumes operation by itself.
76ÉC
PERIOD ACTIVATED
The display does not show what type of error has been
detected. A comprehensive overview of the errors is
provided elsewhere in the
2. The current time falls outside a set time period
of the week program.
The figure shows the display with the following
information:
If, as end-user, you find the appliance in an error
condition, you may attempt to restart the appliance by
-
-
line one: the text PROG
;
pressing the
button
line two: the time, the day and T and T
alternately (9.3 "The appliance's heating
1
net
However, if the error returns or occurs several times in
a short time you must contact your service and
maintenance engineer.
-
-
line three: the next scheduled switch-on
time;
line four: displays the text
PERIOD ACTIVATED
.
In all modes, the temperature may at any moment
drop below the desired temperature. The appliance
then enters a heating cycle. This heating cycle is
basic operating modes.
Note
Setting and if necessary programming of the basic
operating modes are described in the main
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8.4 Service condition
The figure shows the message
!!! WARNING !!!
MAX. BURNING HOURS:
SERVICE REQUIRED
SERVICE REQUIRED.Should this message appear,
then the appliance is in need of a service and
maintenance inspection. In that case, contact your
service and maintenance engineer.
Note
The message SERVICE REQUIREDis based on
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
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Status of the appliance
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9 Starting and running
9.1 Introduction
Topics covered in this chapter, in sequence:
a
•
•
»START OPERATION
^ CHANGE SETPOINT
9.2 Starting and running
Start the appliance as follows:
È
Tset=65ÉC
6. Confirm the START OPERATIONby pressing
.
valve.
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
3. Switch on the power to the appliance using the
isolator between the appliance and the power
supply.
If the heating cycle is not run, there is no heat
demand; if this is the case, Tset will probably need
4. Switch the electronic controller ON by setting the
ON/OFF switch to position I.
9.3 The appliance's heating cycle
The appliance's heating cycle is activated as soon as
n
min
the measured water temperature (T ) falls below the
net
threshold value (T ). This threshold value depends
set
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.
0063
The heating cycle runs in turn through the following
states:
IMD-0423 R0
The display will now show INTERNAL CHECKfor
about 10 seconds and go to the main menu.
1. HEAT DEMAND;
2. PRE-PURGE;
3. PRESSURE SWITCH;
4. PRE-GLOW;
a
5. IGNITION;
INTERNAL CHECK
6. RUNNING;
7. POST-PURGE.
The complete cycle is explained in the following
example, which assumes the appliance is in the basic
mode ON
.
a
MENU
»OFF
^ ON
È WEEK PROGRAM
Note
The same heating cycle applies to the other
operating modes.
5. Press the blue arrow once ( ) to position the
cursor in front of ONand press
. The
display shown in the figure will appear.
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Starting and running
gis
Once the appliance starts, it will run through the
following steps:
5. After a number of seconds pre-glow, the gas
control is opened and ignition takes place.
1. The water temperature drops below the set
temperature of (for example) 65°C. The electronic
controller detects a demand and starts the heating
cycle.
-
-
The icon is activated.
The message IGNITIONappears.
a
-
-
The icon is activated.
ON
Ê
Ê Ê
13:45 Thursday 63ÉC
Tset 65ÉC
The message HEAT DEMANDappears.
a
IGNITION
ON
Ê
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:
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 dimmed.
The icons and are activated.
The message RUNNINGappears.
-
-
The icon is activated.
a
The message PRE PURGEappears.
ON
Ê Ê Ê Ê
a
13:45 Thursday 63ÉC
Tset 65ÉC
ON
Ê Ê
RUNNING
13:45 Thursday 63ÉC
Tset 65ÉC
7. When the water is up to temperature, the heat
demand drops off and the post-purge starts. This
lasts about 25 seconds.
PRE PURGE
3. During the pre-purge, the pressure switch closes.
-
-
-
The icons
,
and are dimmed.
-
-
The icon is activated.
The icon is activated.
The message PRESSURE SWITCH
appears.
The message POST PURGEappears.
a
a
ON
Ê Ê Ê
ON
Ê Ê
13:45 Thursday 63ÉC
Tset 65ÉC
PRESSURE SWITCH
13:45 Thursday 65ÉC
Tset 65ÉC
POST PURGE
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.
8. Following the post-purge, the fan stops and the
pressure switch opens:
-
-
The icons and are dimmed.
The message POST PURGEvanishes.
-
-
The icons and are dimmed
The icon is activated.
a
ON
a
14:05 Thursday 65ÉC
ON
Ê
Ê
13:45 Thursday 63ÉC
Tset 65ÉC
With any subsequent heat demand, the heating cycle
will resume from step 1.
GLOW PLUG
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10 Shutting down
4. Wait until the fan has stopped. The symbol is
then dimmed.
10.1 Introduction
This chapter describes:
5. Switch the appliance OFF (position 0) using the
•
ON/OFF switch on the control panel.
•
•
n
min
10.2 Shut the appliance down for a brief
period ("OFF mode")
0063
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:
IMD-0423 R0
6. Isolate the appliance from the power supply by
setting the isolator between the appliance and the
mains power supply to position 0.
1. Press the
2. Use and to position the cursor in front of OFF
Confirm with
button to select the main menu.
.
.
10.4 Shutting the appliance down for a long
period
OFF
Drain the appliance if you are shutting it down for a
long period. Proceed as follows:
13:45 Thursday 6ÉC
FROST PROTECTION
ACTIVATED
1. Isolate the appliance from the power
The frost protection cuts in if the water temperature
drops below 5°C. The text FROSTwill then appear on
2. Shut off the gas supply.
line one of the display. The appliance heats the water
3. Close the stop valve in the hot water pipe.
to 20°C (T ) and drops back to the OFFmode.
set
4. Close the supply valve of the protected cold supply
set-up.
Note
5. Open the drain valve
These values of 5°C and 20°C cannot be adjusted.
6. Bleed the appliance (or installation) so that it
drains completely.
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 MENUwith
.
2. Position the cursor in front of OFF
.
3. Confirm OFFwith
.
MENU
»OFF
^ ON
È WEEK PROGRAM
Caution
Failure to wait until the fan stops purging can
cause damage to the appliance.
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Shutting down
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11 Main menu
•
•
to decrease the value.
11.1 Notationalconventionformenu-related
instructions
Confirm with
.After confirming, the
appliance enters "ONmode".
The MENU
(
) of the electronic controller is divided
into submenus. For example, SETTINGSis one of the
functions reached from the main menu. The
SETTINGSmenu is divided into submenus in turn.
For example, LANGUAGEis a submenu of
SETTINGS. So, for example, to select the
LANGUAGEmenu, this manual uses the following
notational convention:
SETPOINT
» 65ÉC
Note
If the preset temperature is higher than the current
•
:
SETTINGS
Confirm with
This means:
1. : Activate the main menu with
2. SETTINGS: Use the and/or buttons to go to
SETTINGSand confirm with
|
LANGUAGE
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.
.
.
.
3. LANGUAGE: Use the and/or buttons to go to
LANGUAGE
4. Confirm with
. After entering
, you
11.3.2
Setting water temperature during
ON mode
will have activated the LANGUAGEsubmenu.
11.2 Switching on the "ON mode"
The water temperature can also be directly adjusted
when the appliance is in the "ON mode". Simply use:
You can switch the appliance to the ONmode from any
operational mode, as follows:
•
•
•
to increase the value;
to decrease the value.
1.
:
ON START OPERATION
|
Confirm with
.
Confirm with
.
Note
ON
First consult the chapter about switching
13:45 Thursday 65ÉC
Tset»65ÉC
11.3 Setting the water temperature
11.4 Week program
11.3.1
Setting the water temperature via
the SET POINT MENU
Using the week program, you can set the water
temperature for the days and times you want.
The water temperature can be set to any value
between 40°C and 80°C.
If the appliance is running under a week program, this
is indicated on the display by the PROGtext on the first
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 PROGRAM ACTIVATEDtext.
Set the water temperature via:
1.
:
ON
|
CHANGE SETPOINT
Confirm with
.
START OPERATION
^»CHANGE SETPOINT
PROG
07:55 Monday
64ÉC
È
Tset=65ÉC
MO 08:00 Tset 75ÉC
PROGRAM ACTIVATED
2. Use:
•
to increase the value;
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Main menu
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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.
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
If you want, you can change every setting in the
appliance's standard week program.
65°C and the pump is switched on (P).
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.
DAY TIME Tset
ON »SU 00:00 65ÉC P
OFF SU 23:59
ON MO 00:00 65ÉC P
This following are discussed:
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
•
•
•
•
11.5 Starting and stopping the week
program
ON SA 00:00 65ÉC P
OFF SA 23:59
The week program can be started up from any other
operating mode, as follows:
INSERT
DELETE
START OPERATION
1.
:
WEEK PROGRAM
|
START OPERATION
Confirm with
.
A week program can be shut down simply by
activating a different operating mode, for example the
"ON mode".
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 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:
11.6.1
Week program: setting the switch-
on time
•
switch-on time: day of the week, hours and
minutes:
1. Bring the cursor to SU
Confirm with
.
•
•
•
switch-off time: hours and minutes;
the water temperature setting;
ON »SU 00:00
OFF SU 23:59
Tset 65ÉC
on/off setting for a program-controlled pump.
PUMP ON
SAVE
flashes.
Note
The day indicated by
»
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.
2. Use and to set the desired day. In the example
this is SU(Sunday).
Confirm with
.
Call up the menu for the week program as follows:
ON SU»00:00
•
:
WEEK PROGRAM PROGRAM OVERVIEW.
|
OFF SU 00:59
Tset 65ÉC
PUMP ON
Confirm with
.
SAVE
WEEK PROGRAM
The cursor moves to the hour digits, which flash.
START OPERATION
^»PROGRAM OVERVIEW
È
3. Use and to set the hours. In the example, this
is 08.
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Confirm with
.
11.6.4
Week program: setting the program-
controlled pump
The cursor moves to the minute digits, which flash.
1. If required, a pump can be controlled during the
period. Use and to set PUMP ON . The pump
ensures a regular circulation of hot water in the hot
water pipes. You can skip this step if you there is
no pump in your hot water circuit.
ON SU 08»00
OFF SU 08:00
Tset 65ÉC
PUMP ON
SAVE
Confirm with
.
Note
The cursor moves to
SAVE.
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.
ON SU 08:15
OFF SU 12:45
Tset 75ÉC
4. Use and to set the minutes. In the example,
PUMP»ON
SAVE
this is 15
.
2. Confirm with
.
Confirm with
.
The display shown in the figure will appear.
The cursor moves to the switch-off hour digits,
which flash.
DAY TIME Tset
ON »SU 08:15 75ÉC P
OFF SU 12:45
ON SU 08:15
OFF SU»08:15
Tset 65ÉC
ON MO 00:00 65ÉC P
PUMP ON
SAVE
OFF MO 23:59
ON TU 00:00 65ÉC P
OFF TU 23:59
11.6.2
Week program: setting the switch-
off time
1. Use and to set the hours. In the example, this
is 12
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
.
Confirm with
.
The cursor moves to the minute digits, which flash.
ON SU 08:15
OFF SU 12»15
Tset 65ÉC
4. After changing all desired switch-on and switch off
times, you can start running the week program:
PUMP ON
SAVE
Scroll with to START OPERATION
.
Confirm with
.
2. Use and to set the minutes. In the example,
this is 45
.
11.7 Adding times to a week program
Confirm with
.
Call up the menu to INSERTswitch-on and switch-off
times into a week program as follows:
The cursor moves to the desired water
temperature.
1.
:
WEEK PROGRAM
Confirm with
WEEK PROGRAM
START OPERATION
|
PROGRAM OVERVIEW.
.
ON SU 08:15
OFF SU 12:45
Tset»65ÉC
PUMP ON
SAVE
^»PROGRAM OVERVIEW
È
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
ON SU 08:15
OFF SU 12:45
Tset 75ÉC
PUMP»ON
SAVE
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Main menu
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11.8 Deleting times from a week program
The display shows the menu for the week
program. The cursor points to the active period.
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
DAY TIME Tset
ON »SU 08:15 75ÉC P
OFF SU 12:45
ON MO 00:00 65ÉC P
....................
....................
OFF SA 23:59
INSERT
ON SU 18:00 75ÉC P
OFF SU 22:00
....................
....................
OFF SA 23:59
INSERT
DELETE
START OPERATION
2. Scroll to INSERT
.
DELETE
START OPERATION
Confirm with
.
The sub-menu for adding a period will appear.
To delete a period, proceed as follows:
ON »SU 08:15
OFF SU 12:45
Tset 75ÉC
1.
:
WEEK PROGRAM
Confirm with
MENU
OFF
^»ON
È WEEK PROGRAM
|
PROGRAM OVERVIEW.
.
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.
2. Scroll with to PROGRAM OVERVIEW
.
Confirm with
.
WEEK PROGRAM
START OPERATION
^»PROGRAM OVERVIEW
È
DAY TIME Tset
ON »SU 18:00 75ÉC P
OFF SU 22:00
ON MO 00:00 65ÉC P
The display shows the menu for the week
program.
OFF MO 23:59
....................
....................
OFF SA 23:59
INSERT
3. Scroll with to DELETE
Confirm with
.
.
To warn you that you are now working in the delete
sub-menu, the cursor is replaced with an
DELETE
START OPERATION
exclamation mark (!) and the period settings flash.
DAY TIME Tset
ON !SU 08:15 75ÉC P
OFF SU 12:45
3. Proceed as follows:
ON SU 18:00 75ÉC P
OFF SU 22:00
....................
....................
OFF SA 23:59
INSERT
d. Set the program-controlled
DELETE
START OPERATION
5. To activate the week program with the new period
added, scroll down with to
4. Scroll with to the day to be deleted. For
example, SU(Sunday) in the second period. See
the figure.
START OPERATIONand confirm with
.
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Confirm with
.
If the water temperature becomes too low during the
the appliance will run through the heating
back into the extra period.
DAY TIME Tset
ON !SU 18:00 75ÉC P
OFF SU 22:00
ON MO 00:00 65ÉC P
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.
OFF MO 23:59
....................
....................
OFF SA 23:59
INSERT
11.10 Programming an extra period
1. Call up the menu for entering an extra period via:
DELETE
START OPERATION
2.
:
EXTRA PERIOD
Confirm with
MENU
ON
.
5. The lines showing switch-on/off times are replaced
by the text DELETE BLOCK?. See the figure.
Confirm with
(or use
.
^ WEEK PROGRAM
ȻEXTRA PERIOD
to cancel)
DAY TIME Tset
The display show the settings for the extra period.
Setting the switch-on time
ON !
OFF
DELETE
BLOCK?
ON MO 00:00 65ÉC P
1. Use and to set the day. In the example this is
SU
.
The switching period has been deleted. You will return
now to the week program menu. The cursor points to
the first programmed period.
Confirm with
.
The cursor moves to the hour digits, which flash.
DAY TIME Tset
ON »SU 08:15 75ÉC P
OFF SU 12:45
ON SU»00:00
OFF SU 00:59
Tset 65ÉC
ON MO 00:00 65ÉC P
PUMP ON
START
OFF MO 23:59
....................
....................
OFF SA 23:59
INSERT
2. Use and to set the switch-on hour to the
desired value. In the example, this is 08.
Confirm with
.
The cursor moves to the minute digits, which flash.
DELETE
START OPERATION
ON SU 08»00
OFF SU 08:00
Tset 65ÉC
6. Scroll with to START OPERATION
Confirm with
.
PUMP ON
START
.
The week program is active.
Note
11.9 Extra period
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.
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).
3. Use and to set the minutes. In the example,
this is 15
.
Confirm with
.
If the appliance is running under an "extra period",
then this is indicated in the display with the text
The cursor moves to the hour digits of the switch-
off period.
EXTRA
.
EXTRA
10:00 Monday
MO 11:15 Tset 75ÉC
PERIOD ACTIVATED
ON SU 08:15
OFF SU»08:15
Tset 65ÉC
76ÉC
PUMP ON
START
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Setting the switch-off time
11.11 Settings
1. Use and to set the hours. In the example, this
is 012
Using the SETTINGSoption, you can adjust certain
settings and read certain appliance data:
.
Confirm with
.
•
Adjustable settings
The cursor moves to the minute digits, which flash.
-
-
Language of the menu.
Current day of week and time.
ON
SU 08:15
OFF SU 12»15
Tset 65ÉC
•
Displayable appliance specifications, this
category is only relevant to the installation
engineer and/or service and maintenance
engineer
PUMP ON
START
2. Use and to set the minutes. In the example,
this is 45
-
-
-
Control range (water temperature).
Ignition speed of fan.
.
Confirm with
.
Working speed of fan.
The cursor moves to the water temperature. See
the figure
11.11.1 Setting menu language
To set menu language:
ON
SU 08:15
OFF SU 12:45
Tset»65ÉC
MENU
WEEK PROGRAM
^ EXTRA PERIOD
ȻSETTINGS
PUMP ON
START
Setting the water temperature
1. Use and to set the water temperature. In the
example this is 75°C.
1. Call up the menu for selecting the language as
follows:
Confirm with
.
2.
:
SETTINGS
Confirm with
The display shows the menu for settings.
.
The cursor moves to PUMP ON
.
ON
SU 08:15
OFF SU 12:45
Tset 75ÉC
SETTINGS
»LANGUAGE
PUMP»ON START
^ DAY/TIME
È SPECIFICATIONS
Setting the program-controlled pump
1. If required, a pump can be controlled during the
period. Use and to set PUMP ON. The pump
ensures a regular circulation of hot water in the hot
water pipes. You can skip this step if you there is
no pump in your hot water circuit.
3. The cursor is positioned beside LANGUAGE
Confirm with
.
The display shows the language selection menu.
LANGUAGE
Confirm with
.
ENGLISH
^ NEDERLANDS
ȻDEUTSCH
The cursor moves to START
.
ON
SU 08:15
OFF SU 12:45
Tset 75ÉC
FRANCAIS
ITALIANO
CZECH
PUMP ON »START
ESPANOL
2. Confirm with
.
4. Scroll with to the desired language.
The extra period has been programmed.
Confirm with
.
The language is set.
Note
Once the extra period has completed running, the
controller returns to the mode ON, OFF or
WEEK PROGRAM. The following week, the extra
period will NOT be automatically switched on.
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11.11.2 Setting day and time
Confirm the minute setting with
TIME
To enter the time and day:
15»45
MENU
WEEK PROGRAM
^ EXTRA PERIOD
ȻSETTINGS
The time has been set.
1. Call up the menu for entering the day and time as
follows:
Note
The appliance takes no account of daylight saving.
2.
:
SETTINGS
Confirm with
The display shows the menu for settings.
3. Scroll with and to DAYTIME
.
.
11.11.3 Displaying appliance specifications
Note
/
This category is solely intended for the installation
engineer and/or service and maintenance engineer.
Confirm with
.
SETTINGS
The table shows the correct settings.
LANGUAGE
^»DAY/TIME
È SPECIFICATIONS
BFC 80
BFC 100
Ignition fan speed
(rpm)
2790
3120
The display shows the sub-menu for adjusting the
day.
Working speed of fan 5100
5700
(rpm)
DAY
Regulation interval
40 - 80
40 - 80
»Sunday
^ Monday
È Tuesday
o
( C)
Call up the menu to display the appliance
specifications as follows:
Wednesday
Thursday
Friday
1.
:
SETTINGS
Confirm with
MENU
WEEK PROGRAM
.
.
Saturday
4. The cursor is positioned beside Sunday
.
Scroll with and to the desired day.
^ EXTRA PERIOD
ȻSETTINGS
Confirm with
.
The day has been set. The display shows the sub-
menu for adjusting the time.
2. Scroll with to SPECIFICATIONS
Confirm with
.
TIME
SETTINGS
»00:00
LANGUAGE
^ DAY/TIME
ȻSPECIFICATIONS
5. The cursor moves to the hour digits, which flash.
The display shows the sub-menu for displaying
appliance specifications.
Scroll with and to the current hour, for
example 15.
Confirm with
.
SPECIFICATIONS
»REGULATION INTERVAL
^ IGNITION SPEED
È WORKING SPEED
TIME
15»00
3. Scroll with to the section to be displayed, for
example REGULATION INTERVAL
.
6. The cursor moves to the minute digits, which flash.
Scroll with and to the next minute, for example
45.
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Main menu
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The relevant display appears.
REGULATION INTERVAL
40_80ÉC
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12 Service program
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.
12.1 Introduction
The service program is used by the installation
engineer or service and maintenance engineer for:
•
•
•
•
•
•
•
•
•
HYSTERESE UP »3ÉC
Set the hysteresis via:
•
:
HYSTERESE UP
The figure shows an example
Set the hysteresis via:
HYSTERESE DOWN
•
:
SERVICE MENU
12.3 Displaying the error history
»HYSTERESE
^ HISTORY OF ERRORS
È APPLIANCE HISTORY
Display the error history as follows:
•
:
HISTORY OF ERRORS
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
SELECT APPLIANCE
PUMP RELAY
SERVICE INTERVAL
CONTRAST DISPLAY
TIME BACKLIGHT
SCROLLSPEED
first shows the "Blocking errors". When
is
pressed, the "Lock out errors" are then displayed.
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
The figure shows an example of "Blocking errors". In
this case, the text HISTORY OF ERRORSis followed
by (B)
.
HISTORY OF ERRORS(B)
S04 SENSOR ERROR
F06 IONIZATION
Note
The notation convention for the service menu is
identical to that of the main menu (11.1 "Notational
È CO2 50 HZ ERROR
The figure shows an example of "Lock out errors". In
this case, the text HISTORY OF ERRORSis followed
difference is, you use
program, instead of
menu.
to bring up the service
which brings up the main
by (L)
.
HISTORY OF ERRORS(L)
F02 FAN
12.2 Setting the hysteresis
F07 FLAME ERROR
È ...
If the preset temperature (SETPOINT) is higher than
the current water temperature, then the appliance
might not immediately start the heating
excessively frequent switching on and off, there is a
heating margin. We refer to this margin as the
Note
For an overview of all errors and the possible
causes, please refer to the relevant
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Service program
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12.4 Displaying the appliance history
12.7 Setting the service interval
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.
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.
Call up the menu for displaying the appliance history
as follows:
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
•
:
APPLIANCE HISTORY
The figure shows an example.
appear. Adjust the service interval via:
APPLIANCE HISTORY
BURNINGHOURS 000410
•
:
SERVICE INTERVAL
^IGNITIONS
001000
ÈFLAME ERRORS 000021
SERVICE INTERVAL
» 500
IGNIT ERROR 000013
^ 1000 BURNING HOURS
È 1500
12.5 Display the selected appliance
12.8 Setting the display contrast
Call up the menu for displaying the appliance selection
as follows:
Adjust the display contrast via:
•
:
CONTRAST DISPLAY
•
:
SELECT APPLIANCE
The standard setting is 100%. The range is from 0
through 100%.
The appliance number can be found on the rating
plate.
The figure shows the related display.
The appliance selection has been correctly preset
in the factory.
CONTRAST DISPLAY
SELECT APPLIANCE
»5934
» 95 %
^ 8576
È 3379
12.9 Setting the display backlight time
6527
....
Set the backlight time (the time that the display
backlight remains lit after the last button is pressed) as
follows:
12.6 Switching the pump on or off
•
:
TIME BACKLIGHT
If a program-controlled pump is
installed (3.10.5 "Connecting a program-controlled
pump"), it can be switched ON or OFF as follows:
The standard value is 255 s. The range is 0 to 255
seconds.
The figure shows the related display.
•
:
PUMP RELAY
The standard setting for the pump relay is OFF.
TIME BACKLIGHT
PUMP RELAY
»ON
» 255 sec
OFF
12.10 Setting the display scroll speed
If the mode WEEK PROGRAMor EXTRA PERIODis
active, then the setting for mode WEEK PROGRAMor
EXTRA PERIODhas priority over the ON/OFF
selection for the pump relay in the service menu.
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.
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.
SCROLLSPEED
» 10
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13 Troubleshooting
A distinction is made between:
13.1 Introduction
•
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
•
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
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13.2 Troubleshooting table for general errors
Warning
Maintenance may only be performed by a qualified service and maintenance engineer.
General errors
Symptom
Gas smell
Cause
Solution
Warning
Remark
Gas leak
Warning
Contact your installation engineer or local gas company
immediately.
Close the main gas valve immediately.
Warning
Do not operate any switches.
Warning
No naked flames.
Warning
Ventilate the boiler room.
Display is off
Appliance is turned off Start the appliance up (9 "Starting and running")
No supply voltage
present
1. Check if the isolator is ON.
See the BFC electrical diagram (17 "Appendices")
If the error persists, consult your installation engineer.
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%).
Replace fuse(s)
Defective fuse(s)
To replace the fuses, you must contact your installation engineer.
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Symptom
Cause
Solution
Remark
Water leakage
Leakage from a water Tighten the threaded connection
connection (threaded)
If the leak persists, consult your installation engineer
Condensate leakage
Check that the condensation water discharge is working properly.
Leakage from another Trace the leak
nearby water appliance
or pipe segment
Leakage from the
appliance's tank
Consult the supplier and/or manufacturer
Set the correct supply pressure and/or burner
Explosive ignition
Incorrect supply
If ignition is not improved, consult your installation engineer.
pressure and/or burner pressure. (3.11 "Checking the supply pressure and burner
pressure
pressure")
Contaminated burner
Contaminated orifice
Clean the burner(s) (15.4.2 "Clean the burner(s)")
Hot water supply
Appliance is turned off Start the appliance up (9 "Starting and running")
insufficient or absent
No supply voltage
present
1. Check if the isolator is ON.
See the BFC electrical diagram (17 "Appendices")
If the error persists, consult your installation engineer.
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%).
Hot water supply is
used up
Reduce hot water consumption and give the appliance time to heat If there continues to be insufficient hot water, or none at all, consult
up. your installation engineer.
The controller is in OFF Switch the controller to the ON mode (11.2 "Switching on the "ON
mode. mode"")
Temperature (T ) is
set too low.
Adjust (11.3 "Setting the water temperature") temperature (T ) to
a higher value.
set
set
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13.3 Displayed errors
Code + Description
S01 (blocking error)
Cause
Solution
Remark
Sensorisnot(correctly) Connect the sensor lead to JP3
connected
See the BFC electrical diagram (17 "Appendices")
Open circuit from
temperature sensor T2
at bottom of the tank
Damaged cable or
defective sensor
Replace the sensor
To replace the necessary parts, you must contact your installation
engineer
S02 (blocking error)
Sensorisnot(correctly) Connect the sensor lead to JP5
connected
See the BFC electrical diagram (17 "Appendices")
Open circuit in sensor 1
of temperature sensor
Damaged cable or
defective sensor
Replace sensor T
To replace the necessary parts, you must contact your installation
engineer
1
T at the top of the
1
(1)
tank
.
S03 (blocking error)
Sensorisnot(correctly) Connect the sensor lead to JP5
connected
See the BFC electrical diagram (17 "Appendices")
Open circuit in sensor 2
of temperature sensor
T1 at the top of the tank
(1).
Damaged cable or
defective sensor
Replace sensor T
To replace the necessary parts, you must contact your installation
engineer
1
S04 (blocking error)
Dummy is not
(correctly) connected
Connect the dummy sensor (dummy sensor 1 and 2) leads to JP4. See the BFC electrical diagram (17 "Appendices")
Open circuit from
dummy 1
Defective dummy
Replace the dummy sensor
To replace the necessary parts, you must contact your installation
engineer
S05 (blocking error)
Dummy is not
(correctly) connected
Connect the dummy sensor (dummy sensor 1 and 2) leads to JP4. See the BFC electrical diagram (17 "Appendices")
Open circuit from
dummy 2
Defective dummy
Replace the dummy sensor
To replace the necessary parts, you must contact your installation
engineer
S11 (blocking error)
Short circuit in sensor Replace sensor T
circuit
To replace the necessary parts, you must contact your installation
engineer
2
Short circuit in the
temp. sensor T2 at the
bottom of the tank
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Code + Description
S12 (blocking error)
Cause
Solution
Remark
Short circuit in sensor Replace sensor T
circuit
To replace the necessary parts, you must contact your installation
engineer
1
1
Short circuit in sensor 1
of temperature sensor
T at the top of the
1
(1)
tank
S13 (blocking error)
Short circuit in sensor Replace sensor T
circuit
To replace the necessary parts, you must contact your installation
engineer
Short circuit in sensor 2
of temperature sensor
T1 at the top of the
(1)
tank
(2)
(2)
S14 (blocking error)
Short circuit in sensor Replace the dummy sensor
circuit
To replace the necessary parts, you must contact your installation
engineer
Short circuit from
dummy 1
S15 (blocking error)
Short circuit in sensor Replace the dummy sensor
circuit
To replace the necessary parts, you must contact your installation
engineer
Short circuit from
dummy 2
F01 (blocking error)
Live and neutral
connected wrong way the appliance is phase-sensitive
round
Connect live and neutral correctly (3.10 "Electrical connection");
See the BFC electrical diagram (17 "Appendices")
If errors persist, contact your installation engineer
Defect in power supply
circuit
Condensation on the
flame probe
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
Floating neutral
Install an isolating transformer (3.10.4 "Isolating transformer")
Contact your installation engineer to have an isolating transformer
installed
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Code + Description
F02 (lock out error)
Cause
Solution
Remark
Defective motor and/or 1. Check the motor and rotor
rotor.
See the BFC electrical diagram (17 "Appendices")
2. Replace the fan if the motor or rotor is defective.
Fan fails to run at
correct speed.
To have the wiring replaced and a new fan fitted, you must contact
your installation engineer
3. Reset appliance controller
Damaged wiring
1. Check the wiring between the fan and the controller.
2. If any wires are damaged, the wiring harness must be replaced.
3. Reset appliance controller
Dirty or blocked fan
1. Check if the fan is dirty
2. Check that the rotor can rotate freely
3. Reset appliance controller
Because of a drop in
the supply voltage, the
fan is not running at the
correct speed.
1. Check the supply voltage, this must be 230 VAC (-15%, +10%).
2. Reset appliance controller
The F02 entries below are applicable solely to appliances that have a 3-phase fan with frequency controller.
Fun supplying
insufficient pressure
The live (phase) wires, 1. Check the wiring between the fan and the frequency controller See the BFC electrical diagram (17 "Appendices")
betweenfreq. controller
and fan are connected
wrong way around
2. Rectify the assembly if it is incorrect
To replace the necessary parts, you must contact your installation
engineer
3. Reset appliance controller
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
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Code + Description
Cause
Solution
Remark
Air pressure switch fails Air pressure switch
1. Check the wiring between the air pressure switch and the
controller. Rectify any defect:
to close during pre-
purge.
leads
-
-
if any wires are damaged, replace the wiring harness
properly connect loose or detached hoses
2. Reset appliance controller
Loose air pressure
switch hoses
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
Heat exchanger and/or 3. Measure the pressure differential across the air pressure switch
chimney flue is blocked
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
Defective controller
1. Check that the controller is receiving power
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
Fan supplying
insufficient pressure
The live (phase) wires 1. Check the wiring between the fan and the freq. controller
See the BFC electrical diagram (17 "Appendices")
between frequency
controller and fan are
2. Rectify the assembly if it is incorrect
To replace the necessary parts, you must contact your installation
engineer
connected wrong way 3. Reset appliance controller
around
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Code + Description
Cause
Solution
Remark
Fan speed too low
1. Check the fan speed
3. If the settings are correct, then replace the fan.
4. Modify the settings if incorrect
5. Reset appliance controller
Differential air pressure DAPS leads
switch not closing
during pre-purge
1. Check the wiring between the DAPS and the controller
See the BFC electrical diagram (17 "Appendices")
2. a) If any wires are damaged, the wiring harness must be
replaced.
To replace the necessary parts, you must contact your installation
engineer
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 1. Measure the pressure differential across the DAPS
chimney flue is blocked
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
Defective controller
1. Check that the controller is receiving power
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
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Code + Description
F03 (lock out error)
Cause
Solution
Remark
Damaged wiring/Open 1. Check the wiring between the pressure switch and the
circuit
If the error cannot be resolved or is persistent, contact your
installation engineer
controller
The pressure switch
fails to work correctly
To replace the necessary parts, you must contact your installation
engineer
2. If necessary, replace the wiring
Pressure switch not
closing
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
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.
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Code + Description
F04 (lock out error)
Cause
Solution
Remark
No gas
1. Open the main gas valve and/or the manual gas valve supplying To repair the gas supply, contact your installation engineer
the water heater
Three unsuccessful
ignition attempts.
2. Check the supply pressure to the gas control
3. If necessary, repair the gas supply
Air in the gas pipes
No burner pressure
Bleed the air out of the gas pipe
See Checking the supply pressure and burner pressure for how to
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
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
1. Check that the hot surface igniter is correctly connected (JP2). If the error persists, contact your installation engineer.
surface igniter circuit
To replace the necessary parts, you must contact your installation
engineer
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.
5. If necessary, replace the hot surface igniter.
Defect in the ionisation 1. Check that the flame probe is correctly connected (JP2)
circuit
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.
Supply voltage too low Check the supply voltage, this must be 230 VAC (-15%, +10%).
F05 (lock out error)
Incorrect roof or wall
conduit.
1. Check that the correct roof or wall flue conduit (3.9 "Air supply If the error cannot be resolved or is persistent, contact your
installation engineer
and flue") has been fitted.
Too many flame errors Recirculating flue
have been signalled. gases.
2. If necessary, install the correct roof or wall conduit.
3. Check that the roof or wall conduit discharges into a permitted
area.
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Code + Description
F06 (lock out error)
Cause
Solution
Remark
Damaged cable in
contact with metal
surface.
Check the wiring of the flame probe. If necessary, replace the
wiring.
If the error persists, contact your installation engineer.
To replace the necessary parts, you must contact your installation
engineer
Short circuit between
flame probe and earth
Ceramic part of the
flame probe is
broken/cracked.
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.
F07 (lock out error)
Defective gas valves
1. Check whether there is still burner pressure present after the
gas valves have closed.
If the error cannot be resolved or is persistent, contact your
installation engineer
A flame has been
detected after the gas
valve was closed.
To replace the necessary parts, you must contact your installation
engineer
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.
F08 (lock out error)
Flame detection before 1. Reset the electronic controller.
the gas valve opened.
If the error cannot be resolved or is persistent, contact your
installation engineer
To replace the necessary parts, you must contact your installation
engineer
2. If the error reappears, replace the electronic controller.
Error message from
safety relay
F09 (lock out error)
The temperature at the 1. Check that the circulation pump (if present) is working
top of the tank exceeds
If the error cannot be resolved or is persistent, contact your
installation engineer
2. Check the position of the temperature sensor T .
o
1
93 C.
Water temperature
safety.
3. Reset appliance controller
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Code + Description
F10 (lock out error)
Cause
Solution
Remark
Pressure switch not
closing
1. Check the running speed of the fan (12.5 "Display the selected If the error cannot be resolved or is persistent, contact your
installation engineer
appliance")
Restriction on the
number of ignition
attempts based on
pressure switch state
changes.
To replace the necessary parts, you must contact your installation
engineer
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
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.
F11 (blocking error)
Defective gas valves
See F07.
Flame detection with
closed gas valve.
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Code + Description
C02 (lock out error)
Cause
Solution
Remark
Incorrect reference
voltage from the AD
converter.
1. Reset electronic controller.
To replace the necessary parts, you must contact your installation
engineer
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
Error message from the
appliance controller.
3. If the frequency is correct but the error persists, replace the
electronic controller.
Internal error message
from the appliance
controller.
•
EEPROM read
error
•
•
50 Hz error
Internal
communication
error
Internal error message
from the appliance
controller.
•
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
C03 (blocking error)
Too many resets in too Wait for the error to disappear (maximum 1 hour). If the error does To replace the necessary parts, you must contact your installation
short a period.
not disappear, replace the appliance controller.
engineer
Reset error
C04 (blocking error)
Incorrect appliance
selection / Incorrect
selection resistor
1. Check whether the correct appliance is selected (12.5 "Display If the error cannot be resolved or is persistent, contact your
installation engineer
the selected appliance").
Appliance selection
error
To replace the necessary parts, you must contact your installation
engineer
2. If the correct appliance is selected, fit the correct selection
resistor.
3. If incorrect appliance selected, select the correct one.
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Code + Description
E01 (blocking error)
Cause
Solution
Remark
The temperature of the None. This is a temporary message that may appear from time to
water at the top of the
tank is > 85 C.
time, but will disappear automatically.
o
The temperature
protection at the top of
the tank has been
activated.
E03 (lock-out error)
The two temperature
sensors in the tank
1. Check sensor position and wiring.
To replace the necessary parts, you must contact your installation
engineer
2. If necessary, reset the electronic controller. Replace the sensor
if the error persists.
detect a differential of >
Error in temperature
o
10 C over a period of
sensor T at the top of
1
at least 60 seconds.
the tank.
E04 (lock-out error)
The two dummy
sensors in the tank
1. Check leads from dummy 1 and dummy 2.
To replace the necessary parts, you must contact your installation
engineer
2. If necessary, reset the electronic controller. Replace the dummy
sensor if the error persists.
detect a differential of >
Error in dummy
o
(2)
10 C over a period of
sensor
.
at least 60 seconds.
1) Temperature sensor T is a '2 in 1' sensor, T contains 2 NTCs for the high-limit thermostat and safety thermostat protection.
1
1
(2) The dummy sensor / flue gas sensor comprises dummy sensor / flue gas sensor 1 and dummy sensor / flue gas sensor 2.
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14 Maintenance
frequency
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.
14.1 Introduction
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.
14.2 Determining service
interval
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 REQUIREDwill appear on the display. When this message
appears, the service and maintenance engineer must be contacted.
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Maintenance frequency
is
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s
15 Performing
maintenance
Caution
15.1 Introduction
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.
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:
15.2 Preparation for
maintenance
1. Activate the MENUwith
.
2. Use: and to place the cursor beside OFF
.
3. Confirm OFFwith
.
MENU
»OFF
^ ON
È WEEK PROGRAM
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.
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15
Performing maintenance
s
n
min
0063
IMD-0423 R0
6. Switch the electronic controller ON by setting the ON/OFF switch to
position I.
INTERNAL CHECK
The display will now show INTERNAL CHECKfor about 10 seconds, and
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 ON
then press
Confirm the selection START OPERATIONwith
,
.
-
.
temperature"). Note the original setting. Draw some hot water off to create
heat demand.
set
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
Pressure switch pressure differential
Appliance Observed pressure differential across the pressure switch
(Pa)
BFC 80
> 1005
> 1145
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.
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17. Check the drain pipes from the discharge points of all valves and remove
any lime buildup that may be present.
15.3 Water-side
maintenance
15.3.1 Introduction
The following steps must be carried out on the water side:
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.
1
IMD-0080 R1
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.
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15
Performing maintenance
s
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 Gas-side
maintenance
15.4.1 Introduction
The following steps must be carried out on the gas side:
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)
15.4.3 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:
15.5 Finalizing
maintenance
3. Erase the message SERVICE REQUIRED. Do this by pressing once on
then once on
.
86
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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.
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.
16.1 General warranty
16.2 Tank warranty
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:
16.3 Conditions for
Installation and use
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.
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16
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.
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;
16.4 Exclusions
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
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.
16.5 Scope of the
warranty
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.
16.6 Claims
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.
16.7 Obligations of A.O.
Smith
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
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17 Appendices
This appendix contains:
17.1 Introduction
•
•
Electrical diagram (17.2 "BFC Electrical Diagram.")
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TERMINAL BLOCK CONNECTIONS:
Earth
N Neutral
L
Phase input of controller
1
L Phase output of isolating transformer (secondary side)
2
L Phase input of isolating transformer (primary side)
3
L Phase input of program-controlled pump
4
L Live input of frequency controller
5
L Phase input of continuous pump
COMPONENTS:
A
B
Controller
Flame probe
C Hot surface igniter
D Gas control
E
F
Burner earth connection
Extra ON mode switch
G Program-controlled pump
H External error signal connection
J
Isolating transformer
Double-pole isolator
Controller 0/I switch
K
L
M Display
N Fan
O Temperature sensor (T2 - bottom of tank)
P
Dummy
Q Temperature sensor (T1 - top of tank)
R Selection resistor
S
T
Pressure switch
Potentiostat
U Frequency controller
RS-485 interface
W Electrical anodes
Signalling for electrical anodes
V
X
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
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17
Appendices
is
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17.3 Week program card
You can cut the week program card out and keep it near the appliance.
Period
DAY
TIME
Tset
Pump
ON OFF
Period
DAY
TIME
Tset
Pump
ON OFF
ON
ON
1.
2.
....°C
/
/
/
/
/
/
/
/
/
/
/
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
....°C
/
/
/
/
/
/
/
/
/
/
OFF
ON
OFF
ON
....°C
....°C
....°C
....°C
....°C
....°C
....°C
....°C
....°C
....°C
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
....°C
....°C
....°C
....°C
....°C
....°C
....°C
....°C
....°C
ON
ON
ON
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
OFF
ON
3.
OFF
ON
OFF
ON
4.
OFF
ON
OFF
ON
5.
OFF
ON
OFF
ON
6.
OFF
ON
OFF
ON
7.
OFF
ON
OFF
ON
8.
OFF
ON
OFF
ON
9.
OFF
ON
OFF
ON
10.
OFF
ON
OFF
11.
OFF
Example
Period
DAY
MO
TIME
14:30
16:15
Tset
Pump
ON OFF
ON
1.
70°C
/
OFF
MO
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Index
A
appliance
F
B
G
C
H
I
icons
L
D
E
M
maintenance
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Index
mode
symbol
N
O
T
temperature sensor
operating modes
to shut down
P
U
W
water
R
S
Instruction manual BFC
0308 454
4.2 UK
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