British Gas - CC1

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British Gas - CC1 | Manualzz
Installation and Servicing Instructions
CC1
Wall mounted condensing boiler for central heating and mains
fed domestic hot water
6 720 610 577-00.10
6 720 610 599 GB (03.02) OSW
ZWB 7-29 CC1 GC-Number: 47 108 05
Contents
Contents
Safety precautions
3
Symbols
3
1
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
4
4
4
4
5
5
6
7
8
9
2
Details of the appliance
EC Declaration of Conformity
Standard package
Description of appliance
Accessories
Casing dimensions
Layout of appliance
Function
Electrical wiring diagram
Technical data
Installation regulations
10
6
6.1
6.1.1
6.1.2
6.1.3
6.2
6.2.1
6.2.2
6.2.3
6.2.4
6.2.5
6.2.6
6.2.7
6.3
3
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
3.9.1
3.9.2
3.9.3
Installation
Important remarks
Domestic hot water
Sealed systems
Siting the appliance
Wall mounting frame assembly
Pre-piping the system
Fitting the appliance
Checking the connections
Flue Systems
Siting the Flue Terminal
Installation of the flue
Flue duct preparation and assembly
4
4.1
4.2
Electrical connections
20
Connecting the appliance
20
Mains Voltage external controls connections 21
5
5.1
5.2
5.3
5.4
5.5
22
22
23
23
23
Commissioning
Commissioning
Switching the appliance on/off
Switching on the central heating
System controls
Setting the domestic hot water temperature
and flow rate
5.5.1 Domestic hot water temperature
5.5.2 Hot water flow rate
5.6 Summer mode (hot water only)
5.7 Frost protection
5.8 Pump anti-seize function
5.9 Fault Condition
5.10 Digital Timer
5.10.1Basic Settings
5.10.2Button Functions
5.10.3Programming
5.10.4Setting time and day
5.10.5Setting the timed periods
5.10.6Changing the Operating Mode
5.10.7Deleting Settings
5.10.8Completing Programming
5.10.9Time Display
2
11
11
11
11
12
13
13
14
15
15
16
17
19
24
24
24
24
24
24
25
26
26
26
26
26
26
27
27
27
27
Individual settings
Mechanical settings
Checking the size of the expansion vessel
Setting the central heating flow temperature
Changing the heating pump characteristic
Settings on the Bosch Heatronic
Operating the Bosch Heatronic
Selecting the pump control mode for central
heating mode (Service Function 2.2)
Setting the anti-cycle time
(Service Function 2.4)
Setting the maxim CH flow temperature
(Service Function 2.5)
Setting the switching difference
(Service Function 2.6)
Setting the heating output
(Service Function 5.0)
Constant hot water cycle time
(Service Function 6.8)
Setting the gas/air ratio
28
28
28
28
28
29
29
29
29
30
30
30
30
30
7
Converting the appliance to
different gas types
7.1 Setting the gas/air ratio
7.2 Testing combustion air/flue gas at
set heat output
7.2.1 Testing the O2 or CO2 level in
the combustion air
7.2.2 Testing CO and CO2
33
33
8
Maintenance
8.1 Pre-Service Check List
8.2 Description of servicing operations
8.3 Replacement of Parts
8.3.1 PCB control board and transformer
8.3.2 Fan Assembly
8.3.3 Pump
8.3.4 3-way diverter valve
8.3.5 3-way diverter valve motor
8.3.6 Sensors
8.3.7 Gas Valve
8.3.8 Domestic Hot Water Heat Exchanger
8.3.9 Electrode assembly
8.3.10Pressure gauge
8.3.11Expansion vessel
8.3.12Pressure Relief Valve
8.3.13Burner
8.3.14Flow switch
8.3.15Primary Heat Exchanger
33
34
35
38
38
39
39
40
40
40
41
41
41
41
41
41
41
42
42
9
9.1
9.2
9.3
9.4
9.5
9.5.1
9.5.2
43
43
44
45
45
46
46
47
Appendix
Fault Codes
Short parts list
Heating/hot water output settings (N.G)
Heating/hot water output settings (L.P.G)
Operational Flow diagrams
Domestic hot water function
Central heating function
31
31
33
6 720 610 599 GB (03.02)
Safety precautions
Safety precautions
If you smell gas
B Turn off gas service cock at the meter.
B Open windows and doors.
B Do not operate any electrical switches.
B Extinguish any naked flames.
B Telephone your gas company.
If you smell fumes from the appliance
B Switch off appliance (see page 23).
B Open windows and doors.
Symbols
Safety instructions in this document
are identified by a warning-triangle symbol and are printed on a grey background.
i
Notes containing important information
are identified by the symbol shown on the
left. They are bordered by horizontal lines
above and below the text.
Fitting and modifications
B Fitting of the appliance or any controls to the appliance may only be carried out by a competent engineer in accordance with the Gas Safety (Installation
and Use) Regulations 1998.
B Flue systems must not be modified in any ways other
than as described in the fitting instructions.
B This appliance is for use on sealed primary systems
only.
Maintenance
B The user is recommended: to have the system
regularly serviced in order to ensure that it functions
reliably and safely.
B Use only original spare parts!
Combustible materials
B Do not store or use any combustible materials
(paper, thinners, paints etc.) in the vicinity of the
appliance.
Health and safety
B This appliance contains no asbestos products.
B There is no potential hazard due to the appliance
being electrically unsafe.
B There are no substances used in the construction
that are a potential hazard in relation to the COSHH
Regulations (Control of Substances Hazardous to
Health Regulations 1988).
Combustion air/Ambient atmosphere
B The combustion air/ambient atmosphere should be
kept free of chemically aggressive substances (e.g.
halogenated hydrocarbons which contain chlorine or
fluorine compounds). This will prevent corrosion.
Instructions to the customer
B Explain to the customer how the appliance works
and how to operate it.
B Advise the user that he/she must not make any modifications to the appliance or carry out any repairs on
it.
B These instructions are to be left with the user or at
the Gas meter.
B Important: These instructions apply in the UK only.
6 720 610 599 GB (03.02)
3
Details of the appliance
1
1.1
Details of the appliance
1.3
EC Declaration of Conformity
• Wall-mounted appliance, siting not dependent on
room size
This appliance is in accordance with the applicable
requirements of the Gas Appliance Directive, Boiler
Efficiency Directive, Electromagnetic Compatibility
Directive and the Low Voltage Directive.
PIN
CE-0085 BL 0507
• Natural gas models are low-emission appliances
• Multifunction display
• Bosch Heatronic control system
• Digital timer with 2 channels
• Automatic ignition
• Modulating control
Category
UK
II2H 3P
Appliance Type
C13, C33
Table 1
1.2
Description of appliance
• Full safety systems incorporating Bosch Heatronic
with flame ionisation monitoring, solenoid valves and
temperature sensors
• Concentric flue/air duct with testing point for
CO2/CO
Standard package
• Gas condensing combination boiler for central heating and domestic hot water
• Wall mounting frame
• Clamp for securing flue duct kit
• Regulated speed fan
• Pre-mix burner
• Temperature control for central heating
• Temperature sensor in domestic hot water
• Safety temperature limiter in 24 V electrical circuit
• Fixings (screws etc.)
• Three-speed central heating pump with automatic
vent
• Set of documentation for appliance
• Relief valve, pressure gauge, expansion vessel
• Pre-plumbing manifold
• Flue gas temperature limiter (105 °C)
• Condensate drain pipe.
• Hot water priority circuit
• Motorised 3-way valve
• Plate-type heat exchange
• Condensate Trap.
4
6 720 610 599 GB (03.02)
Details of the appliance
1.4
Accessories
• Standard horizontal flue kit at 100 mm outside
diameter for flues upto 4 m in length.
• Flue duct kits for horizontal (125 mm outside
diameter) for flue lengths upto 13 m and vertical flue
systems for flue lengths upto 15 m. Fitting instructions are sent with these kits.
• Heating programmers
• Security kit.
1.5
Casing dimensions
min.
min.
5*
5*
Z
Y
600*
X
906
861
850
120
101
13
103
30
200
35
360
395
*
200
440
6 720 610 601- 01.3O
Fig. 1
13
101
103
X
Y
Z
*
Manifold assembly
Outer case
Facia cover
Standard Concentric Horizontal Flue System: min. 310 mm
Alternative Concentric Flue System: min. 250 mm
Standard Concentric Horizontal Flue System: 158 mm
Alternative Concentric Flue System: 121 mm
Standard Concentric Horizontal Flue System: 105 mm
Alternative Concentric Flue System: 130 mm
For servicing the appliance
6 720 610 599 GB (03.02)
5
Details of the appliance
1.6
Layout of appliance
120
221.1
349
221.2
234.1
234
27
226
20
102
32.1
29
36
271
6
415
43
9
63
416
358
18
64
423
7
18.1
355
418
6.1
15
8.1
88
CH
422
C
295
88
417
4
6 720 610 599-01.2O
Fig. 2
4
6
6.1
7
8.1
9
15
18
18.1
20
27
29
32.1
36
43
63
64
88
98
6
Heatronic control
Heat exchanger safety temperature limiter
Hot water NTC sensor
Testing point for gas supply pressure
Pressure gauge
Flue gas temperature limiter
Relief valve
Pump
Pump speed selector switch
Expansion vessel
Automatic air vent
Air gas Mixer unit
Electrode assembly
Temperature sensor in CH flow
CH flow
Adjustable gas flow restrictor
Adjusting screw for min. gas flow volume
3-way valve (combi)
DHW flow switch (combi)
102
120
221.1
221.2
226
295
234
234.1
271
349
355
358
415
416
417
418
422
423
Inspection window
Fixing points
Flue duct
Combustion air intake
Fan assembly
Appliance type sticker
Testing point for combustion products
Testing point for combustion air
Flue duct
Cover plate for twin flue duct connection
Plate-type domestic hot water heat exchanger
Condensate trap
Cover plate for cleaning access
Condensate collector
Clip for fixing outer case
Data plate
Digital timer
Siphon
6 720 610 599 GB (03.02)
Details of the appliance
1.7
Function
26
226
229
27
30
33
29
234.1
36
234
32
ϑ
443
221
20
6
35
29.1
9
63
358
52.1
69
64
18
56
52
88
57
7
55
422
317
61
4
8.1
355
15
ECO
3
0
2
1
4
5
96
95
90
E
6.1
CH
max
max
ϑ
91
13
43
44
45
423
94
93
98
C
97
46
M
84
47
6 720 610 599-08.2O
Fig. 3
4
6
6.1
7
8.1
9
13
15
18
20
26
27
29
29.1
30
32
33
35
36
43
44
45
46
47
52
52.1
55
56
57
61
Bosch Heatronic control
Temperature limiter, heat exchanger
Hot water NTC sensor
Testing point for gas supply pressure
Pressure gauge
Flue gas temperature limiter
Manifold
Safety valve
Central heating pump
Expansion vessel
Charging Valve
Automatic vent
Mixer unit
Bi-metallic thermostat for combustion air compensation
Burner
Flame sensing electrode
Igniter electrode
Heat exchanger with cooled combustion chamber
Temperature sensor in CH flow
CH flow
Hot water flow
Gas inlet
Cold water inlet
CH return
Solenoid valve 1
Solenoid valve 2
Filter
Gas valve CE 427
Main valve disc
Reset button
6 720 610 599 GB (03.02)
63
64
69
84
88
90
91
93
94
95
96
97
98
221
226
229
234
234.1
317
355
358
422
423
443
Adjustable gas flow restrictor
Adjusting screw for min. gas inlet flow volume
Control valve
Motor
3-way valve
Venturi
Pressure relief valve
Water flow regulator
Diaphragm
Pushrod with switch cam
Microswitch
Valve for hot water flow volume
Water valve
Flue duct
Fan
Inner casing
Testing point for flue gas
Testing point for combustion air
Display
Plate-type heat exchanger
Condensate trap
Digital timer
Siphon
Diaphragm
7
Details of the appliance
1.8
Electrical wiring diagram
o - orange g - green bl - black r - red p - purple
33
365
364
61
317
366
363
367
ECO
4.1
25 V
153
230V/AC
230 V
310
136
422
135
312
328
302
313
151
318
315
124 789
p
p
L N Ns Ls LR
161
300 314
p
84
M
96
328.1
9
M
g
6
M
g
o
r
o
r
mains supply
18
226
52
52.1
56
o
bl
bl
bl
bl
36
bl
o
6.1
32
6 720 610 599-07.2O
Fig. 4
4.1
6
6.1
9
18
32
33
36
52
52.1
56
61
84
96
135
136
151
153
161
226
300
302
310
312
313
314
315
317
328
8
Ignition transformer
Temperature limiter, heat exchanger
Hot water NTC sensor
Flue gas temperature limiter
Pump
Flame sensing electrode
Ignition electrode
Temperature sensor in CH flow
Solenoid valve 1
Solenoid valve 2
Gas valve CE 427
Reset button
Motor, 3-way valve
Microswitch, hydraulic switch
Master switch
Temperature control for CH flow
Fuse, slow 2.5 A, AC 230 V
Transformer
Link
Fan
Code plug
Earth connection
Temperature control for hot water
Fuse, slow T 1,6 A
Fuse, slow T 0,5 A
Connector for programmer
Terminal block for programmer
Digital display
Terminal block for AC 230 V Mains supply
328.1
363
364
365
366
367
422
Link
Indicator lamp for burner
Indicator lamp for power supply
“Chimney sweep” button
Service button
ECO button
Digital timer
6 720 610 599 GB (03.02)
Details of the appliance
1.9
Technical data
Units
Max. rated heat output net 40/30˚C central heating
kW
Max. rated heat output net 50/30˚C central heating
kW
Max. rated heat output net 80/60˚C central heating
kW
Max. rated heat input net
kW
Min. rated heat output net 40/30˚C
kW
Min. rated heat output net 50/30˚C
kW
Min. rated heat output net 80/60˚C
kW
Min. rated heat input net
kW
Max. rated heat output net, domestic hot water
kW
Max. rated heat input net, domestic hot water
kW
Maximum gas flow rate – After 10 minutes from lighting
Natural gas G20 (CVnet 34.02 MJ/m3)
m3/h
3
LPG (CVnet 88 MJ/m )
kg/h
Gas supply pressure
Natural gas G20 (CVnet 34.02 MJ/m3)
mbar
3
LPG (CVnet 88 MJ/m )
mbar
Expansion vessel
Charge pressure
bar
Total capacity
l
Hot water specifications
Hot water flow rate (factory setting)
l/min
Max. hot water flow rate
l/min
Outlet temperature range
˚C
Max. permissible water supply pressure
bar
Min. inlet pressure
bar
Specific flow rate
l/min
Flue
Flue gas temp. 80/60˚C, rated/min. load
˚C
Flue gas temp. 40/30˚C, rated/min. load
˚C
Residual delivery pressure
(inc. pressure drop in air intake duct)
Pa
CO2 level at max. rated heat output
%
CO2 level at min. rated heat output
%
NOx-class
SEDBUK figure, Band A
%
Condensate
Max. condensation rate (tR = 30˚C)
l/h
pH-value, approx.
General Data
Electrical power supply voltage
AC ... V
Frequency
Hz
Max. power consumption
W
Noise output level
dB(A)
Appliance protection rating
IP
Max. CH flow temperature
˚C
Max. permissible operating pressure (CH)
bar
Permissible ambient temperatures
˚C
Nominal capacity of appliance
l
Weight (excluding packing)
kg
Natural gas
Propane
31.2
30.9
29.2
29.5
8.4
8.3
7.4
7.6
29.2
29.5
31.2
30.9
29.2
29.5
11.6
11.4
10.5
10.8
29.2
29.5
3.1
-
2.3
20
-
37
0.75
10
0.75
10
8
14
40 - 60
10
0.2
13.3
8
14
40 - 60
10
0.2
13.3
67/55
43/32
67/55
43/32
80
9.2
8.8
5
90.6
80
10.8
10.5
5
90.6
2.5
4.8
2.5
4.8
230
50
106
36
X4D
nom. 90
2.5
0 - 50
3.75
46
230
50
106
36
X4D
nom. 90
2.5
0 - 50
3.75
46
Table 2
6 720 610 599 GB (03.02)
9
Installation regulations
Condensate analysis, mg/l
Ammonium
1.2
Domestic water performance
Nickel
0.15
≤ 0.01
Mercury
Cadmium
≤ 0.001
Sulphate
Chromium
≤ 0.005
Zinc
≤ 0.015
Tin
≤ 0.01
Lead
Halogenated
hydrocarbons
≤ 0.002
Hydrocarbons
0.015
Vanadium
Copper
0.028
pH-value
≤ 0.0001
Domestic
Water Flow
Rate l/min
Temperature
Rise
30 °C
Temperature
Rise
35 °C
12.1
Temperature
Rise
40 °C
10.6
Maximum Mains pressure
bar
10.0
Minimum Mains pressure
bar
0.2
1
≤ 0.001
4.8
14.2
Table 8
Table 3
2
Flue system
HORIZONTAL 100 mm – Standard
Overall Diameter of Duct
mm
100
Flue Terminal / Duct
Assembly Length
mm
600
Extension Duct Length
mm
1000
Max.
4m
Table 4
ALTERNATIVE HORIZONTAL 125 mm FLUE
SYSTEM
Overall Diameter of Duct
mm
125
Flue Terminal / Duct Assembly
mm
1030
Max.
13 m
(including
turret)
Table 5
Overall Diameter of Duct
mm
125
Flue Terminal / Duct Assembly
mm
1360
Max.
15 m
Table 6
Elbow - 90 ° Equivalent length 2 m
Bend - 45 ° Equivalent length 1m
6
• BS 5449: Central Heating for Domestic Premises
• BS 5546: Installation of gas hot water supplies for
domestic purposes
• BS 5440:1: Flues and ventilation for gas appliances
of rated input not exceeding 70 kW (net): Flues
Gas supply
3
Gas Safety (Installation & Use) Regulations 1998: All
gas appliances must be installed by a competent person. Failure to install correctly could lead to prosecution.
The manufacturers notes must not be taken, in any way,
as overriding statutory obligations.
The appliance must be installed in accordance with the
current IEE Wiring Regulations, local Building Regulations, Building Standards (Scotland) (Consolidation),
bye-laws of the local Water Company, Health and
Safety Document 635 (Electricity at Work Regulations
1989) and any other local requirements.
Product Liability regulations indicate that, in certain circumstances, the installer can be held responsible, not
only for mistakes on his part but also for damage resulting from the use of faulty materials. We advise the
installer to avoid any risk by using only quality approved
branded fittings.
The relevant British Standards should be followed i.e.
• BS 6798: Specification for the installation of gas
fired hot water boilers of rated input not exceeding
60kW
VERTICAL 125 mm FLUE SYSTEM
Total length of gas supply pipe
(metres)
Installation regulations
Pipe diameter
(mm)
9
• BS 5440:2: Flues and ventilation for gas appliances
of rated input not exceeding 70 kW (net): Air
Supply
• BS 6891: Installation of low pressure gas pipework
installations up to 28mm (R1).
• BS 7074:1: Code of practice for domestic heating
and hot water supply
Gas discharge rate (m3/h)
• BS 7671: Requirements for Electrical Installation.
8.7
5.8
4.6
22
18.0
12.0
9.4
28
These instructions must be followed.
Table 7
10
6 720 610 599 GB (03.02)
Installation
3
Installation
B Always turn off the gas cock before carrying out any work on components
which carry gas.
i
3.1
Fixing of the appliance, gas and flue connections, commissioning of the system
and electrical connections may only be
carried out by competent persons authorised by CORGI.
Important remarks
B Appliance should only be installed in sealed central
heating systems.
B To avoid gas formation in the system, galvanised
radiators or pipes must not be used.
B If a room thermostat is used: do not fit a thermostatic
radiator valve on the radiator in the primary room.
B Add a suitable anti-freeze fluid compatible with aluminium to the water in the central heating system.
Suitable products are available from Betz-Dearborn
Tel.: 0151 4209563 and Fernox Tel.: 01799
550811.
B In our experience, the addition of sealing agents to
the water in the central heating system can cause
problems (deposits in the heat exchanger). For that
reason we advise against their use.
3.2
Domestic hot water
Any regulations specified by the local water company
must be observed.
The final 600 mm of the mains cold water connection to
the applaince should be made in copper tube only.
The appliance is suitable for a mains supply having a
maximum pressure of 10 bar. A pressure reducing valve
must be fitted, if necessary.
The hot water outlet temperature is set to be capable of
achieving a maximum of 60˚C. The maximum temperature and the frequency of the recharge of the heat store
may be reset.
A water flow rate of 10.6 l/min will give a temperature
rise of 40˚C. If a higher rise is required then the flow
must be reduced at the tap and the discharge temperature will rise up to the maximum set figure.
The temperature rise, upto the maximum set by the user,
is automatically maintained by the modulation of the
heat input. In winter, when the mains temperature is
very low, the water flow, adjusted at the tap or shower,
should be reduced to maintain the required delivery
temperature.
It is suggested that long pipe runs to taps or showers
be insulated to prevent the rapid cooling of the water.
6 720 610 599 GB (03.02)
All types of single lever mixer taps and thermostatic
mixer units suitable for a mains pressure of up to 10 bar
can be used.
The head of a loose-head shower must not be allowed
to fall within 25 mm of the top the bath to prevent the
risk of water being drawn back into the mains. Alternatively the shower must be fitted with an anti-syphonage
device at the point of the flexible hose connections.
Over-rim bidets may be connected to the appliance
provided that it is in accordance with the requirements
of the local water company. The outlet(s) should be
shrouded and unable to have any temporary hand held
spray attached. No anti-syphonage arrangements are
necessary.
In exceptionally hard water areas a device to prevent
scale formation may be fitted or, alternatively, the maximum temperature reset to about 45˚C which may
reduce the risk of scale formation. The installation of a
scale inhibitor assembly should be in accordance with
the requirements of the local water company. Artificially
softened water must not be used to fill the central heating system. An isolating valve should be fitted to allow
for servicing.
Devices, such as water meters or back-flow prevention valves, capable of preventing the flow of
expansion water must not be fitted unless separate arrangements have been made.
A Zilmet Z160 expansion vessel is the preferred type. A
thread sealant compatible with potable water must be
used. The vessel should be connected into the cold
water mains inlet pipe as close as possible to the appliance.
3.3
Sealed systems
The appliance must not be operated without the system
being full of water, properly vented and pressurised.
The expansion vessel has a volume of 10 litres and is
charged to a pressure of 0.75 bar.
The water capacity of the system is shown in table 13,
page 28. If a greater capacity is required then an additional expansion vessel must be fitted into the system
return as close to the appliance as possible. The system
pressure can be set up to a maximum of 1.5 bar with 1
bar being the normal setting.
If the system pressure is greater than 2.65 bar when the
appliance is operating at maximum temperature then an
additional expansion vessel must be fitted into the system return as close to the appliance as possible.
The filling point must be at low level and arranged as
shown in figs. 5 and 6.
The pressure relief valve is set to operate at 3 bar.
There must be no connection to the mains without the
approval of the local water company. All connections in
the system must be capable of withstanding a pressure
of up to 3 bar and the radiator valves conform to the
requirements of BS 2767:10.
11
Installation
substances will invalidate the guarantee. The pH
value of the system water must be less than 8 or
the appliance guarantee will be invalidated.
A drain cock to BS2879 must be fitted to the lowest
point of the system.
IMPORTANT: Check that no dirt is left in the
water pipework as this could damage the appliance. Thoroughly flush the heating system and
the mains water supply before fitting the appliance to the wall in accordance with the recommendations of BS7593:1992.
If Thermostatic Radiator Valves are fitted then it is recommended that the the primary radiator is left open.
Repeated venting probably indicates a leak and this
must be rectified to ensure the proper operation of the
appliance.
No galvanised radiators or pipes must be used.
If any system water treatment is required then
only products suitable for use with Aluminium
shall be used i.e Fernox- Copal or Superconcentrate or Sentinal X100, in accordance with the
manufacturers instructions. The use of any other
APPLIANCE
Refer to Fig.1
Appliance
water flow
diagram
A drain cock should be fitted at
the lowest point of the heating
circuit and the appliance
WRAS approved
filling loop
Lockshield
valve
Central heating return
Domestic
hot water
Central heating flow
Radiator
valve
BS stop valve.
Fixed spindle type
Water
main
Fig. 5
6 720 610 576 -09.3O
Sealed primary water system
Sealed system filling and make up
Make up
vessel
Heating return
Heating return
Auto
air vent
Non return Non return
valve
valve
Hose union
Stop
cock
Stop cock
Test cock
Temporary hose
Non return
valve
Fill point
1000mm (39 in)
above the highest
point of the system.
6 720 611 137 - 29.1O
Fig. 6
3.4
Siting the appliance
Regulations concerning the Installation Site
B Relevant national regulations must be complied with
section 3.9.1.
B Consult the installation instructions for details of minimum clearances required.
Combustion air
In order to prevent corrosion, the combustion air must
not contain any corrosive substances.
Substances classed as corrosion-promoting include
halogenated hydrocarbons which contain chlorine and
fluorine compounds and are contained in some solvents, paints, adhesives, aerosol propellants and
household cleaners, for example.
12
Surface temperature
The max. surface temperature of the casing and the flue
is less than 85 °C.
This means that, no special safety precautions are
required with regard to flammable building materials
and fitted furniture. The specified clearences must be
maintained.
Cupboard/Compartment
The appliance can be installed in a cupboard/compartment need for airing clothes providing that the requirements of BS6798 and BS5440:2 are followed. The low
casing losses from the appliance eliminate the need for
ventilation openings in the compartment.
6 720 610 599 GB (03.02)
Installation
3.5
Wall mounting frame assembly
B Take the wall mounting frame out of the package and
screw together with 6 screws as shown in fig. 7. Use
the inner lugs on the top and bottom horizontal sections for the appliances that are 440 mm wide.
B Screw the pre-plumbing manifold with two screws to
the wall mounting frame.
6 720 610 576-11.1O
Fig. 9
6 720 610 576-04.1O
Fig. 7
3.6
Pre-piping the system
200
B Hold the wall-mounting frame against the wall ensuring that it is vertical.
B Mark the position of the flue duct hole if a rear flue is
to be used. Refer to fig. 1 and 16.
B Mark the holes for the wall mounting frame onto the
wall, drill and plug the holes and screw the wall
mounting frame to the wall with the screws provided.
171
112
172
43
47
35
50
120-130
260
6 720 610 576-06.1O
Fig. 10 Manifold
43
47
112
171
172
6 720 610 576-05.1O
Fig. 8
6 720 610 599 GB (03.02)
CH flow
CH return
Gas cock
Domestic hot water
Cold water relief
B A drain tap should be fitted at the lowest point of the
central heating system.
B WRAS approved filling loop must be fitted.
13
Installation
Condensate Termination and Route
The condensate connection on the British Gas/Bosch
appliances is in 22 mm plastic. The pipe should be
extended and run away from the appliance with a constant fall of 2.5 ° or 40 mm in every metre.
The condensate pipe can terminate into any of four
areas:
Boiler
Boiler
Ø 22 min.
No length
restriction
• The pipe run should take the shortest practical route.
Sink
Siphon
External length of
pipe 2m min.
Siphon
Ø 22 min.
75 min. trap
Open end of pipe
direct into gully,
below ground but
above water level.
Use waterproof pipe work
insulation in very exposed
positions
The gradient of the discharge pipe
should be 2.5° (40 mm/m) minimum
Open end of pipe direct
into gully, below ground
but above water level
An internal waste system
An external waste system
Boiler
Ø 22 min.
Internal soil
and vent stack
No length
restriction
Sink
Siphon
Ø 22 min.
75 min. trap
The gradient of the discharge pipe Invert
should be 2.5° (40 mm/m) minimum
The rainwater system
75 min. trap
450 min.
No length
restriction
• The pipework should be insulated with weather
resistant insulation.
• The pipe should terminate as close as possible to the
ground or drain, whilst still allowing the condensate
to safely disperse. This would prevent wind blowing
up the pipe.
The gradient of the discharge pipe should be
2.5° (40 mm/m) minimum
Boiler
External condensate pipework
All British Gas/Bosch condensing boilers have within a
syphonic condensate trap. Rather than the condensate
constantly dripping into the discharge pipe, the condensate is collected into a trap which releases it in
100 ml quantities.
This will help prevent freezing occurring.
If there is no alternative and the condensate pipe has to
be externally run, the following should be considered:
Open end of pipe
direct into gully,
below ground but
above water level
The gradient of the discharge pipe
should be 2.5° (40 mm/m) minimum
• The pipework should be installed with the minimum
of horizontal runs and with a downward slope of at
least 2.5 °.
3.7
Fitting the appliance
An external purpose made soakaway
Benchmark: For optimum performance
after installation, this boiler and its associated central heating system must be
flushed in accordance with the guidelines given in BS5793:1992 “Treatment
of water in domestic hot water central
heating systems”.
6 720 610 596 -03.1O
Fig. 11
Whilst all of the above methods are acceptable it is
always the best practice to terminate the condense
pipe via an internal waste system.This will eliminate the
need for any external condensate pipe runs which can
be susceptible to freezing in extreme weather.
B Remove packing, taking care to observe the instructions on the packing.
B Lie the boiler on its back.
Removing the outer case
i
The outer case is secured against unauthorised removal by two clips (electrical
safety).
Always secure the outer case with those
clips again after refitting.
B Turn the clips with a screwdriver.
B Slide the outer case upwards and then forwards to
remove.
6 720 610 602 - 03.1O
Fig. 12 Position of the condensate drain
14
6 720 610 599 GB (03.02)
Installation
B Remove the plastic caps from the boiler connections.
3.8
Checking the connections
Water connections
B Check that the O-rings or seals are in place before
tightening the connection.
B Turn on the service valves for central heating flow
and return and fill the heating system through a
WRAS approved filling loop.
B Check all seals and unions for leaks (testing pressure max. 3.0 bar as indicated by pressure gauge).
B Turn on cold water service cock and fill hot water
system (testing pressure max. 10 bar).
B Check all connections for leaks.
2.
CH
C
1.
Gas supply pipe
6 720 610 599-02.1O
Fig. 13
Fixing the appliance
B Fit the washers onto the gas and water connections.
B Lift the boiler onto the wall-mounting frame. The lugs
pass through the rectangular holes in the boiler back
panel.
B Take care not to disturb the washers on the connections.
Connecting the flue duct
B Fit flue duct connector onto appliance flue spigot.
B Secure with the two screws supplied.
1
3
3.9
Flue Systems
The only flue systems that may be used are those supplied with the boiler.
The flue system must be installed in accordance with
the requirements of BS5440:1.
Standard 100 mm flue system
The standard concentric flue system provides for a horizontal length of upto 4 m. Full instructions for fitting this
flue are in Subsection 3.9.2 “Installation of the flue”.
Alternative 125 mm diameter flue systems
Installation instructions for the alternative flue systems
are sent with the appropriate flue kit.
Systems are available to give a maximum horizontal
length of 13 m.
A vertical flue system upto a height of 15 metres is available.
45° and 90° flue bends can be used with a corresponding reduction in flue length of 2m for each 90° bend and
1 m for each 45° bend used.
1 .
2
B Check that the seal is in place before tightening the
connection.
B Turn off gas cock to protect gas valve against damage from excessive pressure.
B Check gas supply pipe.
B Release the pressure on the gas supply pipe.
4
2 .
6 7 2 0 6 1 0 3 3 2 -0 9 .2 R
Fig. 14
B For remaining installation of flue assembly, refer to
the relevant installation instructions.
6 720 610 599 GB (03.02)
IMPORTANT: Any horizontal flue system fitted to a
condensing boiler must incline towards the appliance at
an angle of 3 % (30 mm per metre length) to prevent
condensate dripping from the flue terminal. This
means that the clearance above the appliance
must be increased to match the duct length.
Refer to fig. 1 on page 5.
15
Installation
3.9.1 Siting the Flue Terminal
The flue must be installed in accordance with
BS 5440:1 and the Building Regulations. Flue terminals in carports and under balconies are to be avoided.
The terminal must be positioned so that it does not
cause an obstruction nor the combustion products a
nuisance. See fig. 15 and table 9.
The terminal will, at times, give out a plume of water
vapour and consideration must be given to this when
choosing a terminal position. Keep clear of security
lighting, activated by passive infra-red sensing heads.
If the terminal is less than 2 m above a surface to which
people have access then a guard must be fitted. The
guard must be evenly spaced about the terminal with a
space of 50 mm in each direction and fixed with plated
screws.
A guard Type K6 for the standard horizontal flue, can be
obtained from Tower Flue Components, Vale Rise, Tonbridge TN9 1TB.
Fig. 15
Minimum dimensions of flue terminal positions (all types) (see fig. 15)
Dimension
A
1)
B 1)
C
1)
Terminal Position (kW input expressed in net)
Balanced flues room sealed: Fanned draught
Directly below an opening, air brick, opening windows, etc.
300 mm
Above an opening, air brick, opening window, etc.
300 mm
Horizontally to an opening, air brick, opening window, etc.
300 mm
D
Below gutters, soil pipes or drain pipes
75 mm
E
Below eaves
200 mm
F 2)
Below balconies or car port roof (lowest point)
200 mm
G
From a vertical drain pipe or soil pipe
150 mm
H
From an internal or external corner
300 mm
I
Above ground roof or balcony level
300 mm
J
From a surface facing the terminal
600 mm
K
From a terminal facing the terminal
1200 mm
L
From an opening in the car port (e. g. door, window) into the dwelling
1200 mm
M
Vertically from a terminal on the same wall
1500mm
N
Horizontally from a terminal on the same wall
O
From the wall on which the terminal is mounted
Not applicable
300 mm
P
From a vertical structure on the roof
Not applicable
Q
Above intersection with roof
Not applicable
Table 9
1)
2)
16
In addition, the terminal should not be nearer than 150 mm (fanned draught) to an opening in the building fabric formed for the purpose of accommodating a built-in element such as a window frame.
Not recommended.
6 720 610 599 GB (03.02)
Installation
3.9.2 Installation of the flue
The standard 100 mm diameter horizontal flue system
is suitable for lengths upto 4 m.
Flues upto 650 mm do not require an extension duct
assembly.
Flues between 1600 mm and 4000 mm require extension duct assemblies.
NOTE: Flue lengths between 650 mm and 730 mm
cannot be accomodated. Refer to Fig. 17, 18, 19.
Standard system comprise: Flue turret - Flue turret
clamp - Terminal assembly - Wall sealing - plates.
Extension kit comprises: Air duct - Flue duct - Duct
clamp. Refer to Fig. 20.
Instructions for fitting other flue systems are packed
with the relevant flue kit.
Check that the position chosen for the appliance is satisfactory Refer to Fig. 16.
Terminal
Assembly
Flue
Turret
Maximum 650 mm
Outer
Wall
No
Clamp
6 720 610 602 - 08.1O
Fig. 17 Standard Flue
Drilling point for
flue duct opening
Centre line of
flue/air duct
H
Centre
line of
flue
opening
and
appliance
120
3%
(30 mm/metre)
Top of the
wall
mounting
frame
Appliance
H
Standard Horizontal Flue 158 mm
Optional Horizontal Flue 121 mm
6 720 610 602-07.2O
Fig. 16 Marking the position of the side flue opening
6 720 610 599 GB (03.02)
17
Installation
Terminal
Assembly
Flue
Turret
Maximum 1600mm
Outer
Wall
Clamp
No
Clamp
Extension
Duct
6 720 610 602 - 09.1O
Fig. 18 Flue with one extension
Terminal
Assembly
Flue
Turret
No
Clamp
Outer
Wall
Clamp
Clamp
Extension
Duct
Extension
Duct
6 720 610 602 - 10.1O
Fig. 19 Flue with extensions
Duct Clamp
Flue
Turret
Extension Air Duct
Extension Flue Duct
Terminal Assembly
Wall Sealing Plates
6 720 610 602 - 11.1O
Fig. 20 Flue components
18
6 720 610 599 GB (03.02)
Installation
3.9.3 Flue duct preparation and assembly
Measure the flue length L. Refer to fig. 21, 22.
Outer
Wall
Face
Flue Terminal
L
Raised Ring
locating the
terminal relative
to the outside
wall face
120
6 720 610 576 - 20.1O
NOTE: THE FLUE MUST BE INCLINED T O THE
6 720 610 602 - 12.1O
BOILER
Fig. 21 Flue length - rear
Fig. 23 Flue terminal position
L
Assemble flue system completely. Push the ducts fully
together and clamp in the positions. The slope of the
terminal outlet must face downwards.
The assembly will be made easier if a solvent free
grease is lightly applied i.e Vaseline, to the male end of
the ducts.
NOTE: An inner wall sealing plate is provided
which should be fitted to the ducts before assembly.
Push the assembly through the wall and fix the turret to
the appliance with the clamp. Refer to fig. 24.
NOTE: THE FLUE MUST BE INCLINED T O THE
6 720 610 602 - 13.1O
BOILER
Flue Turret
Fig. 22 Flue length - side
Mark off the lengths shown onto the ducts and cut to
length. The cuts must be square and free from burrs.
Terminal assembly outer (air) duct - L- 70 mm, inner
(flue) duct - L- 50 mm.The measurement is made from
the ridge at the terminal indicating the outer face of the
wall. Refer to fig. 23.
Extension air duct - L- 70mm, flue duct - L- 50 mm.
The measurement is from the formed end.
Clamp
Flue Socket
on Boiler
Air and
Flue Duct
Entry into
silicone
rubber seals
6 720 610 602 - 14.1O
Fig. 24 Flue turret
Ensure that the turret is fully entered into the socket on
the boiler. From the outside fix the outer wall plate to the
terminal and, after ensuring the duct is properly i nclined
towards the boiler, fix the plate to the wall.
If the terminal is within 2 m of the ground where there is
access then an approved terminal guard must be fitted.
The guard must give a clearance of at least 50 mm
around the terminal an be fixed with corrosion resistant
srews.
6 720 610 599 GB (03.02)
19
Electrical connections
4
Electrical connections
B Remove screw and slide terminal cover forwards to
remove. Refer to fig. 26.
B Always disconnect the power supply to
the appliance at the mains before carrying out any work on the electrical systems and components.
3
0
4
2
5
1
E
All control and safety systems are built into the appliance.
CH
C
B Allow mains cable to protrude at least 50 cm from
wall.
B To make splash-water proof (IP): cut the cable grommet hole size to match diameter of cable, see Fig. 27.
It must be possible to isolate the appliance. The appliance must be earthed.
The appliance must be connected to the mains through
a 6 A double pole isolator with a contact separation
3 mm in all poles and supplying the appliance and controls only. The wiring must comply with the current
requirements of the IEE Wiring Regulations and any
local regulations which apply.
6 720 610 599 -03.1O
Fig. 26
B Cut cable grommet to diameter of cable.
3
0
4
2
5
1
E
• Supply: 230 V ~ 50 Hz, 140 Watts
• Mains cable: PVC insulated 0.75 mm 2
(24 x 0.20 mm) to BS6500-Table 6.
Temperature rated 100˚C.
• Protection IPX4D
• External fuse 3 A.
4.1
8-9
5-7
Connecting the appliance
To gain access to the mains connection remove the
drop down facia cover. The drop down cover is
removed by lowering it to the horizontal position and
pushing firmly upwards at the rear of the supports to
release the cover. Lift cover from the appliance.
After installation (or in the event of an electrical fault) the
electrical system shall be checked for short circuits,
fuse failure, incorrect polarity of connections, earth continuity and resistance to earth.
10-12
3
2
6 720 610 332-12.1R
Fig. 27
B Feed cable through cable grommet and connect the
mains supply cable, see fig. 28.
B Secure cable in cable grommet by means of cable
grip.
L
B Pull out cover panel at the bottom and remove. Refer
to fig. 25.
0
13-14
N NS L S L R
4
5
1
E
4130-14.1R
Fig. 28
6 720 610 332-10.1R
Fig. 25
20
6 720 610 599 GB (03.02)
Electrical connections
4.2
Mains Voltage external controls
connections
NOTE: Only double insulated controls not requiring an earth can be used
Ns Ls LR
Ns Ls LR
ST8
Switched Live
Neutral
Remove Link
Live
Live
Switched Live
Neutral
ST8
Motor
230 V Room Thermostat Connections
230 V Programmer Connections
Ns Ls LR
d
ve
ra
l
Li
ut
Live
he
Ne
itc
Sw
it ch
ed
Live
Series
connection
to be made
safe
Sw
Live
ST8
Neutral
230 V room thermostat and
Programmer Connections
Motor
6 720 610 576 - 22.1O
Fig. 29
Note: If an external timer is used then the domestic hot
water pre-heat facility can only be isolated by actuating
the ECO-button.
6 720 610 599 GB (03.02)
21
Commissioning
5
Commissioning
27
136 365
61
317 366 367
358
ECO
422
2
364
363
135
8.1
E
310
CH
C
295
15
170
171
172
173
170
6 720 610 599-04.2O
Fig. 30
8.1
15
27
61
135
136
170
171
172
173
295
310
317
358
363
364
365
366
367
422
22
Pressure gauge
Safety valve
Automatic vent
Reset button
Master switch
Temperature control for central heating
Service cocks on CH flow and return
Hot water
Gas cock (shown in on position)
Cold water service cock
Appliance type sticker
Temperature control for hot water
Multifunction display
Condensate trap
Indicator lamp for burner
Indicator lamp for power supply
“Chimney sweep” button
Service button
ECO button
Digital timer
5.1
Commissioning
Never run the appliance when empty or
unpressurised.
i
The operational CO2 level is set at the factory and no adjustment is necessary when
installing a natural gas fired appliance.
Benchmark Water Treatment: For optimum performance after installation, this boiler and its associated central heating system should be flushed in accordance
with the guidelines given in BS7593:1992 - Treatment
of water in domestic hot water systems. Full instructions are supplied with proprietary cleansers sold for
this purpose. If an inhibitor is to be used after flushing,
it should be used in accordance with the inhibitor manufacturers instructions.
To drain the appliance shut the system valves and open
the system drain point.
Suitable flushing agents and inhibitors are available
from Betz/Dearborn Tel.: 0151 4209563, Fernox Tel.:
01799 550811 and Salamander Tel.: 0121 378 0952.
Instructions for use are supplied with the these
products.
6 720 610 599 GB (03.02)
Commissioning
B Before commissioning, the gas supply pressure must be checked at the gas supply pressure test point (see page 6, fig. 2, item 7).
Natural gas appliances must not be operated if
the gas supply pressure is below 18 mbar or
above 24 mbar. LPG appliances must not be
operated if the supply pressure is not 37 mbar
at the inlet to the appliance.
B Unscrew the condensation trap (358) and pull out,
fill with approx. 1/4 l of water and refit. Refer to
fig. 30.
B Adjust charge pressure of expansion vessel to static
head of the central heating system (see page 28).
B Open all system radiator valves.
B Turn on service valves (170), fill central heating system to pressure of 1 - 2 bar through the WRAS
approved filling loop. Refer to fig. 30.
B Vent radiators.
B Refill heating system and set the pressure to 1 bar.
B Turn on cold water service cock (173). Refer to
fig. 30.
B Check that the gas type specified on the identification plate matches that of the gas supply.
B Turn on gas cock (172). Refer to fig. 30.
5.2
Switching off the appliance
B Set the master switch to (0).
The green indicator lamp goes out.
B Always disconnect the appliance from
the power supply (fuse, circuit breaker)
before carrying out any work on the
electrical systems or components.
5.3
Switching on the central heating
The central heating flow temperature is adjustable
between 35˚C and 88˚C. Refer to table 14, page 28.
B Turn the temperature control
to set the flow temperature to a level appropriate to the type of central
heating system:
– Underfloor heating: e.g. setting “3”
(approx. 50˚C)
– Low-temperature heating: setting “E”
(approx. 75˚C)
– Central heating systems for flow temperatures up
to 88 °C: limited “max” setting for low-temperature
operation (see page 28).
When the burner is alight, the red indicator lamp
lights up.
Switching the appliance on/off
Switching on
B Switch on the appliance at the master switch (I).
The indicator lamp shows green and the display will
show the central heating flow temperature, when the
appliance is operating in the central heating mode.
6 720 610 333-05.1O
Fig. 32
5.4
6 720 610 333-04.1O
Fig. 31
i
System controls
B Set room thermostat to the desired room temperature.
B Set outside - temperature driven control unit, if fitted.
Refer to the instructions with the control.
B Set the thermostatic radiator valves to the desired
settings.
If the display alternates between -II- and
the central heating flow temperature, the
trap filling programme is active.
The trap filling programme ensures that the condensation trap is filled after the appliance has been installed
or after the appliance has been out of use for a long
period or the mains supply has been interrupted. For
that reason, the appliance remains at minimum heating
output for 15 minutes.
6 720 610 599 GB (03.02)
23
Commissioning
5.5
Setting the domestic hot water
temperature and flow rate
5.5.1 Domestic hot water temperature
The hot water temperature can be set to between
approx. 40 °C and 60 °C.
This temperature is not shown on the display.
B To reduce the flow rate (min. 8 l/min):
turn screw on flow switch clockwise (–).
The outlet temperature will increase relative to the
decrease in the flow rate.
6720 610 332-25.1O
6 720 610 333-07.1O
Fig. 34
Fig. 33
5.6
Summer mode (hot water only)
Setting
Hot Water temperature
Turn fully anti-clockwise
approx. 40˚C
With room thermostat
approx. 55˚C
Turn fully clockwise
approx. 60˚C
B Turn temperature control
on the appliance anticlockwise as far as the stop.
The central heating is now turned off. The hot water
function and the mains power supply for the heating
programmer and timer remain switched on.
Table 10
“ECO” button
By pressing and holding the “ECO” button , until the
display lights, you can switch between Comfort mode
and Economy mode.
Comfort mode: button is not lit (factory setting)
The appliance is held constantly at the set temperature.
This means that hot water is available almost instantaneously at the tap. Consequently the appliance will
switch on at intervals, even if no hot water is being
drawn.
ECO mode with demand detection, button is lit
The demand detection function enables maximum gas
and water economy.
Briefly turning a hot water tap on and then off again signals demand to the appliance which then heats up the
water to the set temperature.
Hot water is thus available in about 1 minute.
ECO mode, button is lit
Water is not heated up until hot water is drawn. This
means that there is a longer waiting period before hot
water is available.
5.7
Frost protection
B Leave master switch switched on.
If the appliance is to be left for long periods switch the
central heating off:
B Add a suitable anti-freeze fluid to the water in the
central heating system.
Suitable products are available from Betz-Dearborn
Tel.: 0151 4209563 and Fernox Tel.: 01799
550811.
5.8
i
Pump anti-seize function
This function prevents the central heating
pump seizing after long periods of inactivity.
Every time the pump is switched off, a timer is started.
If after 24 hours the pump has not run again, it is
switched on for a period of 5 minutes.
5.5.2 Hot water flow rate
The flow rate is factory set to 8 l/min.
Under standard conditions (2 bar) supply pressure, one
full turn is equivalent to approximately 2 l/min.
B To increase the flow rate (max. 14 l/min):
turn screw on flow switch anti-clockwise (+).
The outlet temperature will decrease relative to the
increase in the flow rate.
24
6 720 610 599 GB (03.02)
Commissioning
5.9
i
Fault Condition
A list of faults that may occur is given on
page 43.
In the unlikely event of a fault occuring while the appliance is in operation:
The display then shows a fault code and the button
may also flash.
If the button
flashes:
B Press and hold the button
until the display shows
“– –”.
The appliance will then start up again and the display
will show the central heating flow temperature.
If the button
does not flash:
B Switch the appliance off and then on again at the
master switch.
The appliance will start up again and the central heating flow temperature will be displayed.
6 720 610 599 GB (03.02)
25
Commissioning
5.10 Digital Timer
5.10.3 Programming
5.10.4 Setting time and day
B Press
repeatedly until the display shows
PROG.
B The hour setting flashes: change hour by pressing
or
.
B Press and release
; the minutes setting flashes:
set minutes by pressing
or
.
B Press and release
; the day setting flashes: set
day by pressing
or
. (1 = Monday, 2 = Tuesday, etc.).
Ch
Ch1
AUTO
ON
Ch2
ON
AUTO
CH
C
6 720 610 607-04.1R
Fig. 35
CH 1
CH 2
C
Ch
Channel 1
Channel 2
Clear
Move to next setting
Menu button
Set button
Set button
The timer has two channels:
• Channel 1 (CH 1) timer program with 3 timed periods each day for central heating
• Channel 2 (CH 2) timer program with 3 timed periods each day for hot water “Comfort” mode.
5.10.1 Basic Settings
Channel 1 – CH 1 – Central heating, all days
• ON : 6:00
Changing between summer and winter time:
B Adjust the time as described.
B Do not alter the timed periods.
5.10.5 Setting the timed periods
Setting options:
• Max. 3 timed periods per day
• Same times for groups of days or different times for
each day
• Possible day groupings:
– All days (1-7)
– Monday to Friday (1-5)
– Saturday and Sunday (6-7)
i
The timed periods can be set in
increments of 10 minutes.
The timed periods are sorted in ascending
order.
• OFF : 22:00.
Channel 2 – CH 2 – Hot water, all days
• ON : 5:00
• OFF : 22:00.
No other timed periods are programmed (––:––).
5.10.2 Button Functions
• Menu button
:
–
PROG: Time, Day
– CH1 PROG: Timed periods, Channel 1
– CH2 PROG: Timed periods, Channel 2
– CH1 PROG: Mode, Channel 1
– CH2 PROG: Mode, Channel 2
Ch
•
•
C
B Press
repeatedly until the display shows CH1
PROG or CH2 PROG: All days are shown (1-7).
B Press
or
repeatedly until the desired day or
group of days is shown.
B Press and release
: the first ON time is displayed
(e.g. 6:00).
B Set the ON time by pressing
or
.
B Press and release
: the first OFF time is displayed (e.g. 22:00).
B Set the OFF time by pressing
or
.
B Press and release
: the second ON time is displayed. Continue as with the first timed period.
Ch
: Clear
: Move to next setting
• Set button
or
:
– Press and release: changes setting by one unit
– Press and hold: changes setting continuously.
26
6 720 610 599 GB (03.02)
Commissioning
5.10.6 Changing the Operating Mode
B Press
repeatedly until the display shows CH1
PROG or CH2 PROG.
B Set mode by pressing
or
:
– ON: Central heating on (CH 1)/hot water on
(CH 2)
– OFF: Central heating off/Economy (CH 1)/hot
water “Comfort” mode, “ECO” mode off (CH 2)
– AUTO: The timer switches the central heating
(CH 1)/hot water (CH 2) on and off according to
the timed-period settings
Ch
CH
1
ON
OFF
ON
OFF
3
4
5
Deleting an individual timed period:
B Select required timed period on the display (see
chapter 5.10.5).
B Briefly press and release C .
7
B Press
repeatedly until the normal display
appears.
-orB Do not press any buttons for 30 seconds.
OFF
III
2
6
5.10.8 Completing Programming
ON
II
1
5.10.7 Deleting Settings
Resetting the timer completely:
B Press and hold C for approx. 15 seconds.
I
Table 11
Hot water comfort mode
CH
2
I
ON
II
OFF
ON
III
OFF
ON
OFF
1
Ch
5.10.9 Time Display
Time of day and timed periods are displayed either in
24-hour (default setting) or 12-hour format.
i
The time display format cannot be
changed while programming.
2
3
4
5
6
7
Table 12
To change the time display format:
B Press and hold
and
simultaneously (for
about 10 seconds). In 12-hour time format, the display also shows am (morning) or pm pm (afternoon)
next to the time.
6 720 610 599 GB (03.02)
27
Individual settings
6
Individual settings
6.1
Mechanical settings
B Rotate yellow button through 180° and replace (dot
facing inwards).
The CH flow temperature is no longer limited.
6.1.1 Checking the size of the expansion vessel
Maximum pressure at maximum CH flow temperature is
2.5 bar. If the pressure is greater than this then fit an
extra expansion vessel. Refer to table 13.
System Capacity – BS7074:1
Expansion Vessel Pressure and System Capacity
Control setting
CH flow temperature
1
2
3
4
5
E
max
approx. 35˚C
approx. 43˚C
approx. 51˚C
approx. 59˚C
approx. 67˚C
approx. 75˚C
approx. 88˚C
Expansion Vessel
litres
10
Table 14
Expansion Vessel
Charge Pressure
bar
0.75
1 bar
litres
82
6.1.3 Changing the heating pump characteristic
The speed of the central heating pump can be altered
on the pump terminal box.
1.5 bar
litres
46
System
pressure
and
capacity
At switch position 1, maximum output is
not delivered if hot water mode is active.
Position 1 must not be used on combi appliances.
i
Table 13
6.1.2
Setting the central heating flow temperature
The central heating flow temperature can be set to
between 35˚C and 88˚C.
i
H
0,7
(bar)
0,6
0,5
With underfloor heating systems, observe
the maximum permissible flow temperatures.
3
0,4
2
0,3
Limited maximum setting for low-temperature
operation
The temperature control is factory limited to setting E,
giving a maximum flow temperature of 75˚C.
Adjustment of the heating output to the calculated heat
demand is not required by the heating systems regulations.
Removing the maximum setting limit
For heating systems which require higher flow temperatures, the maximum setting limit can be removed.
B Lift off the yellow button on the temperature control
with a screwdriver.
0,2
1
0,1
0
0
200
400
600
800
1000 1200 1400 1600
Q (l/h)
6 720 610 576-23.2O
Fig. 37
1
2
3
H
Q
Pump characteristic for switch position 1
Pump characteristic for switch position 2
Pump characteristic for switch position 3
Residual delivery pressure
Water circulation rate
6 720 610 332-27.1O
Fig. 36
28
6 720 610 599 GB (03.02)
Individual settings
6.2
Settings on the Bosch Heatronic
6.2.1 Operating the Bosch Heatronic
The Bosch Heatronic enables easy setting and checking of a large number of appliance functions.
This description is limited to those functions required
for commissioning.
For a full description of all available functions, please
refer to the Service booklet for the Engineer, order no.
7 181 465 346.
5
2
Entering a setting
B To enter the setting for a function, turn the temperature control
.
Storing a setting
B Level 1: press and hold the
button until the display shows [ ].
B Level 2: press and hold the
and
buttons simultaneously until the display shows [ ].
After completing the settings
1
B Reset the temperature controls
original positions.
6.2.2
6 720 610 332-30.1O
i
4
3
Fig. 38 Appliance controls
1
2
3
4
5
Service button
“Chimney sweep” button
Temperature control for central heating
Temperature control for hot water
Display
The service functions are subdivided into two levels:
Level 1 comprises service functions up to function 4.9,
while Level 2 consists of the service functions from 5.0
upwards.
B To select a service function on Level 1: press and
hold the
button until the display shows – –.
B To select a service function on Level 2: press and
hold the buttons
and
simultaneously until the
display shows = =.
B Then turn the
temperature control to select the
required function.
6 720 610 599 GB (03.02)
Selecting the pump control mode for central heating mode (Service Function 2.2)
If an outside temperature driven control
unit is connected, pump control mode 3 is
automatically activated
• Control Mode 1
For heating equipment without a control unit.
The pump is controlled by the central heating flow
temperature control.
Note the positions of the temperature controls
and
. After completing the settings, return the temperature controls to
their original positions.
Service function
Code no.
Pump control mode
2.2
Anti-cycle time
2.4
Max. CH flow
temperature
2.5
Switching difference
2.6
Max. heating output
5.0
Constant hot water
cycle time
6.8
Table 15
The service function 5.0 may be reset.
to their
The choice of settings is as follows:
Selecting service function:
i
and
See page
29
29
30
30
30
30
• Control Mode 2 (factory setting)
For heating systems with room thermostat.
The central heating flow temperature control controls
only the gas, the pump is not affected. The room thermostat controls both the gas and the pump.
The pump and fan have an overrun time of between
15 s and 3 min.
• Control Mode 3
The pump is controlled by the outside temperature
driven control unit. In summer mode, the pump operates only for hot water mode.
6.2.3
Setting the anti-cycle time
(Service Function 2.4)
This service function is only active if Service Function
2.7, automatic anti-cycle time, is deactivated.
The anti-cycle time can be set to between 0 and 15 minutes (is factory set to 3 minutes).
If the setting 0 is entered, the anti-cycle time is inactive.
The shortest possible anti-cycle time is 1 minute (recommended for single-pipe and hot-air heating systems).
i
If the appliance is connected to an outside-temperature controlled heating programmer, the anti-cycle time does not
need to be set on the appliance and is optimised by the programmer instead.
29
Individual settings
6.2.4
Setting the maxim CH flow temperature
(Service Function 2.5)
The maximum CH flow temperature can be set to
between 35˚C and 88˚C (factory setting).
6.2.5
i
Setting the switching difference
(Service Function 2.6)
If the appliance is connected to an outside-temperature controlled programmer,
the programmer sets the switching difference.
It does not need to be set on the appliance.
B Refer to the settings tables for heating and cylinder
charging output to obtain the relevant code for the
desired heating output in kW (see page 45).
B Turn the temperature control
until the display
shows the desired code number.
The display and the
and
buttons will flash.
B Measure the gas flow rate and compare with the figures specified for the code number displayed. If figures do not match, adjust the code number!
B Press and hold the
and
buttons simultaneously until the display shows [ ].
The heating output is now stored.
The switching difference is the permissible divergence
from the specified CH flow temperature. It can be set in
increments of 1 K. The adjustment range is 1 to 30 K (is
factory set to 0 K). The minimum CH flow temperature
is 30˚C.
6 720 610 332-52.1O
6.2.6
Setting the heating output
(Service Function 5.0)
The heating output can be set to any level between min.
rated heat output and max rated heat output to limit it to
the specific heat requirements.
i
The full rated heat output is still available
for hot water or charging the hot water cylinder even if the heating output has been
limited.
The factory setting is the max. rated heat output.
B Press and hold the
and
buttons simultaneously until the display shows = =.
The
and
buttons will light up.
6 720 610 332-50.1O
Fig. 39
B Turn the temperature control
until the display
shows 5.0.
After a short delay, the display then shows the set
heating output in percent.
Fig. 41
B Return the temperature controls
and
to their
original positions.
The display will revert to the CH flow temperate.
6.2.7
Constant hot water cycle time
(Service Function 6.8)
In Comfort mode “ECO light off” , the hot water inside
the appliance is held constantly at the set temperature.
For that reason, the appliance switches on if the water
temperature falls below a certain temperature. In order
to prevent it switching on and off too frequently, the
constant hot water cycle time service function allows
you to set the minimum period between switching off
and on again. This function has no effect on normal
demand for hot water and relates only to the constant
hot water function in Comfort mode.
The cycle time can be set to any period between 20 and
60 minutes (is factory set to 20 minutes).
6.3
Setting the gas/air ratio
The appliance is set at the factory and adjustment is not
necessary.
6 720 610 332-51.1O
Fig. 40
30
6 720 610 599 GB (03.02)
Converting the appliance to different gas types
7
Converting the appliance to different gas types
The setting is factory sealed at maximum. Adjustment to
the rated heat input and min. heat input is not necessary.
Checking the gas supply pressure
B Check the gas supply pressure at the gas supply
pressure testing point.
i
Natural gas appliances must not be operated if the gas supply pressure is below
18 mbar or above 24 mbar.
LPG appliances must not be operated if
the supply pressure is below or above
37 mbar.
7.1
Setting the gas/air ratio
The gas/air ratio may only be adjusted on the
basis of a CO2 measurement at max. heat output
and min. heat output using an electronic tester.
B Switch off the appliance at the master switch (O).
B Remove the outer case (see page 15, refer to
fig. 13).
B Switch on the appliance at the master switch (I).
B Unscrew sealing plug from flue gas testing
point (234). Refer to fig. 42.
B Insert testing probe about 135 mm into the flue gas
testing point and seal testing point.
Natural gas
• Appliances for natural gas type G20 are factory set
to Wobbe-Index 15 kWh/m 3 and 20 mbar supply
pressure and sealed.
Conversion kits
2 3 4
Model
For conversion
from ...
Order no.
ZWB 7-29
N.G to L.P.G
7 710 149 048
ZWB 11-27
L.P.G to N.G
7 710 239 084
6 7 2 0 6 1 0 3 3 2 -5 7 .2 R
Table 16
Fig. 42
• Instructions are sent with each conversion kit.
B Press and hold
button until the display shows – –.
The
button will light up.
6 720 610 332-32.1O
Fig. 43
B Turn the temperature control
until the display
shows 2.0 .
After a short delay, the current operating mode setting will be displayed (0. = Normal mode).
6 720 610 332-60.1O
Fig. 44
6 720 610 599 GB (03.02)
31
Converting the appliance to different gas types
B Turn the temperature control
until the display
shows 2. (= max. rated heat output).
The display and the
button will flash.
B Remove the seal from the gas valve adjusting
screw (64) and adjust the CO 2 level to the figure
given in Table 17 for min. rated heat output.
64
6 720 610 332-61.1O
Fig. 45
B Measure the CO2 level.
B Prise off the seal on the gas flow restrictor.
B Adjust the gas flow restrictor (63) to obtain the CO 2
level given in Table 17. Refer to fig. 46.
63
6 720 610 332-64.1R
Fig. 46
Gas Type
Natural gas type
G20
LPG G31
(propane)
Table 17
CO2 reading
at max.
rated heat
output
CO2 reading
at min.
rated heat
output
9.2 %
8.8 %
10.8 %
10.5 %
3928-74.1R
Fig. 48
B Recheck the levels at min. and max. rated heat output
and re-adjust if necessary.
B Turn the temperature control
anti-clockwise as
far as the stop so that the display shows 0.
(= Normal operating mode).
The display and the
button will flash.
B Press and hold the
button until the display
shows [ ].
B Reset the temperature controls
and
to their
original positions.
The display will revert to the CH flow temperature.
B Remove testing probe from the flue gas testing
point (234) and refit sealing plug.
B Re-seal gas valve adjusting screw and gas flow
restrictor.
B Replace outer case and secure.
B Turn the temperature control
anti-clockwise until
the display shows 1. (= min. rated heat output).
The display and the
button will flash.
6 720 610 332-63.1O
Fig. 47
B Measure the CO2 level.
32
6 720 610 599 GB (03.02)
Maintenance
7.2
Testing combustion air/flue gas at
set heat output
7.2.1
Testing the O2 or CO2 level in the combustion air
i
By testing the O2 or CO2 level in the combustion air the gas tightness of a type C13
or C33 flue system can be checked. The
O2 level must not be less than 20,6 %.
The CO2 level must not exceed 0,2 %.
B Press and hold the
button until the display
shows – –.
“Chimney sweep” mode is now active.
The
button will light up and the display shows the
CH flow temperature.
i
In “chimney sweep” mode, the appliance
switches to max. rated heat output or the
set heating output. You then have 15 minutes in which to measure the levels. After
that, the appliance switches back from
“chimney sweep” mode to normal mode.
i
B Remove sealing plug from flue gas testing point
(234, Fig. 49).
B Insert testing probe about 135 mm into the testing
point and seal testing point.
B CO- and CO2 levels.
B Refit sealing plug.
B Press and hold
button until the display shows – –.
The
button will stop flashing and the display
shows the CH flow temperature.
8
Maintenance
B Always disconnect the appliance from
the electrical power supply (fuse, circuit
breaker) before carrying out any work on
the electrical systems or components.
B Remove sealing plug from combustion air testing
point (234.1, fig. 49).
B Insert testing probe about 80 mm into the testing
point and seal testing point.
B Always turn off the gas cock before carrying out any work on components
which carry gas.
i
i
2 3 4
2 3 4 .1
6 7 2 0 6 1 0 3 3 2 -6 5 .2 R
Fig. 49
B Measure O2 and CO2 levels.
B Refit sealing plug.
B Press and hold
button until the display shows – –.
The
button will stop flashing and the display
shows the CH flow temperature.
7.2.2
Testing CO and CO 2
B Press and hold the
button until the display
shows – –.
“Chimney sweep” mode is now active.
The
button will light up and the display shows the
CH flow temperature.
6 720 610 599 GB (03.02)
You have 15 minutes in which to measure
the levels. After that, the appliance switches back from “chimney sweep” mode to
normal mode.
There is a special Service booklet for the
Engineer, order no. 7 181 465 346, available to competent persons.
All safety and control systems are monitored by the Bosch Heatronic. In the event
of a component fault, the display shows a
fault code.
B The User should be recommended to have the appliance serviced regularly by a competent person (see
Maintenance Contract).
B Use only genuine spare parts
B Refer to the Spare Parts List when ordering spare
parts.
B Always renew seals and O-rings removed during
servicing or repair work.
B Use only the following types of grease:
– Water valve: WRAS approved silicon based
grease
– Unions: approved sealant.
B To drain the appliance shut the system valves and
open the pressure relief valve.
B Upon completion of any electrical work check for
earth continuity, correct polarisation and resistance
to earth.
33
Maintenance
8.1
Pre-Service Check List
Date
1
Call up the last fault stored by the
Bosch Heatronic, Service Function .0,
(see page 35).
2
Check ionisation current, Service
Function 3.3, (see page 35).
3
Perform visual check of air/flue duct.
Visual check of diaphragm for soiling
and splits (see page 37).
4
Check gas supply pressure
(see page 31).
5
Test combustion air/flue gas
(see page 33).
6
Check CO2 setting for min./
max. (gas/air ratio)
(see page 31).
mbar
min. %
max. %
7
Check gas and water systems for
leaks (see page 15).
8
On combi models, check hot water
outlet temperature (see page 35).
9
Check heat exchanger
(see page 35).
mbar
10 Check burner (see page 36).
11 Clean condensation trap
(see page 37).
12 Check charge pressure of
mbar
expansion vessel matches
static head of heating system.
13 Check central heating system mbar
pressure.
14 Check electrical wiring for damage.
15 Check heating programmer settings.
16 Check appliances that are part of
the heating system
Table 18
34
6 720 610 599 GB (03.02)
Maintenance
8.2
Description of servicing operations
The combustion performance must be checked before
and after any servicing work on the combustion and
burner components. Refer to section 7.2.
Check “Last fault stored”:
Primary Heat exchanger
There is a special accessory kit (no. 840) for cleaning
the heat exchanger, order no. 7 719 001 996.
B Check control pressure on the air - gas mixer unit at
max. rated heat output using an electronic manometer.
B Select Service Function .0 (See page 29 “Selecting
Service Function”).
There is a list of the fault codes in the Appendix (see
page 43.
To delete “Last fault stored”:
B Turn temperature control
anti-clockwise as far as
the stop.
B Press and hold the
button until the display
shows [ ].
The last fault stored has now been deleted.
Checking the ionisation current,
Service Function 3.3
B Select Service Function 3.3 (See page 29 “Selecting Service Function”).
If the display shows 2 or 3, the ionisation current is OK.
If the display shows 0 or 1, the electrode assembly
(32.1, page 6) must be cleaned or replaced.
Domestic hot water
If the flow rate is too slow:
B remove the domestic hot water heat exchanger and
replace,
-orB descale with a descaling agent approved for use on
stainless steel.
B Before removing the heat exchanger shut the inlet
valve and drain the hot water circuit.
B Use new seals when replacing the heat exchanger.
6 720 610 332-69.1R
Fig. 51
i
The heat exchanger should only be
cleaned if the control pressure is
3.0 mbar (depression) or less.
B Remove cleaning access cover (415, page 6) and
the metal plate below it, if present. Refer to fig. 2.
B Unscrew condensation trap and place suitable container underneath. Refer to fig. 52.
B Remove the fan and the burner as described in the
text headed “Burner” (see page 36).
6 720 610 332-72.1R
Fig. 52
7 181 465 330-06.1R
Fig. 50
6 720 610 599 GB (03.02)
35
Maintenance
B Loosen any deposits in the heat exchanger from top
to bottom using the cleaning blade. Refer to fig. 53.
Burner
B Check that the gas cock is turned off and the master
switch is in the OFF position
B Remove the clips (1) and unscrew the two bolts (2).
Refer to fig. 56.
B Unscrew and remove the two hexagon screws securing the fan (3).
B Slacken fully the rear securing bolt (4).
B Remove the burner coverplate.
4.
6 720 610 332-73.1R
2.
Fig. 53
B Clean the heat exchanger from top to bottom using
the brush. Refer to fig. 54.
3.
1.
7 181 465 330-04.1R
Fig. 56
B Remove the burner skin and clean components. Do
not use a wire brush. Refer to fig. 57.
6 720 610 332-74.1R
Fig. 54
B Flush the heat exchanger from the top. Refer to
fig. 55.
B Clean out the condensate collector and trap connection (with other end of brush).
7 181 465 330-08.1R
6 720 610 332-75.2R
Fig. 55
B Refit the clean-out cover using a new seal and
tighten screws to torque of approx. 5 Nm.
36
Fig. 57
B Re-assemble burner in reverse order using a new
seal.
B Adjust gas/air ratio. Refer to section 7.2.
6 720 610 599 GB (03.02)
Maintenance
Diaphragm in mixer unit
B Take care not to damage diaphragm
(443) when removing and refitting it.
B Open mixer unit (29).
B Carefully withdraw diaphragm (443) from fan intake
tube and check for soiling and splits.
3.
B Clean the electrodes with a non-metallic brush. (The
spark gap should be 4,5 mm ± 0,5 mm.)
B Replace and re-connect the assembly taking care
not to mislay the inspection window.
Siphon
B Unscrew the clip and disconnect the pipe to the
siphon.
B Remove the yellow plug to drain the siphon.
B Unscrew the securing nut from beneath the side
facia and remove the siphon. Refer to figure below.
B Refit and prime the siphon.
443
29
Condensate
Drain
Siphon
1.
2.
6 720 610 602 - 16.1O
6 720 610 790-07.2R
Fig. 58
Fig. 59
B Carefully refit diaphragm (443) the correct way
round into the fan intake tube.
Expansion vessel
The expansion vessel should be checked once a year.
i
The flaps of the diaphragm (443) must
open upwards.
B Seal the mixer unit (29).
Condensation trap
In order to prevent spillage of condensate, the condensation trap should be completely removed, (see
page 35, fig. 52).
B Unscrew condensation trap and check connection
to heat exchanger is clear.
B Remove condensation trap cover and clean.
B Fill condensation trap with approx. 1/4 l of water and
refit.
Electrode assembly
B Switch off the master switch.
B Pull off the leads from the electrodes. Refer to fig. 2.
B Unscrew the two fixing screws and carefully remove
the electrode assembly . Refer to fig. 51.
6 720 610 599 GB (03.02)
B Depressurise appliance.
B If necessary, adjust expansion vessel charge pressure to static head of the heating system.
Heating system pressure
i
Fill the system using the WRAS approved
filling loop.
B The pointer on the pressure gauge should be 1 bar.
B If the pointer is below 1 bar (when the system is
cold), water should be added until the pointer is
1 bar again.
B Max. pressure of 2.5 bar when the heating system
water is at maximum temperature must not be
exceeded. If this pressure is exceeded then an extra
expansion vessel must be fitted in the system return
as close to the appliance as possible.
B If the system does not retain the pressure, the expansion vessel and the heating system should be
checked for leaks.
37
Maintenance
B Remove the pcb control board.
Electrical wiring
B Check the electrical wiring for physical damage and
replace any damaged wires.
8.3
Replacement of Parts
Before changing any components check that the gas is
turned off and that the appliance is electrically isolated.
When necessary close the system valves and drain the
appliance.
Refitting is a reverse of the procedure for removal using
new seals or o-rings as appropriate.
8.3.1
PCB control board and transformer
B Switch off the appliance.
B Disconnect appliance from the power supply.
B Unplug all connectors from the control box (inc.
keyed plug). Access is gained by removing the covers. Refer to fig. 25, 26.
B Remove screw holding power connector earth lead
and remove earth lead.
B Remove two fixing screws from the control box.
Refer to fig. 60.
7 181 465 330-10.1R
Fig. 61
Fuses
1
3
2 4
3
4
B Remove the connections covers. Refer to fig. 25, 26.
1
3
2 4
2
5
1
E
CH
1
6 720 610 599-05.1O
3
2 4
C
The fuses are located adjacent to the mains connector
block and connector ST18. Refer to fig. 4.
Fuse, item 312, is only replaceable by removing the
pcb.
Spare fuses are fixed to the connections cover.
A fuse pack is available: Part number 8 744 503 010 0.
Fig. 60
B Lower the control box.
B Unscrew earth lead.
B Unscrew four fixing screws from cover plate. Refer to
fig. 61.
B Prise off cover plate.
B Pull off transformer.
B Remove pcb holder.
38
6 720 610 599 GB (03.02)
Maintenance
8.3.2
Fan Assembly
8.3.3
3.
Pump
B Switch off the appliance.
B Disconnect the appliance from the power supply.
B Remove two switchbox fixing screws (1.). Refer to
fig. 63.
B Lower switchbox (2.).
2.
B Unscrew and remove the the siphon by releasing the
jubilee clip. Refer to fig. 59.
B Unscrew the pump union nuts (5.). Refer to fig. 63.
B Carefully remove the pump and disconnect the
leads.
4.
Alternatively
B After removing the siphon release the four Allen
screws and remove and replace the pump head.
3.
1.
7 181 465 330-05.1R
Fig. 62
B Switch off the appliance.
B Disconnect the appliance from the power supply.
B Undo lower pipe union on gas pipe (1.). Refer to
fig. 62.
B Remove fan lead and earth connector (2.). The earth
connector has a positive clip fixing.
B Remove fixing screws attaching fan to the burner
cover (3.).
B Remove fan together with gas pipe and mixer unit.
B Separate the fan from the pipe and mixer unit by
twisting the mixer unit to release it (4.).
1.
1.
CH
C
2.
Fig. 63
6 720 610 599 GB (03.02)
39
Maintenance
8.3.4
B
B
B
B
B
B
B
B
B
B
8.3.6
3-way diverter valve
Switch off the appliance.
Disconnect appliance from the power supply.
Turn off service cocks.
Unplug connector from 3-way valve motor. Refer to
fig. 64.
Pull out retaining clip.
Remove motor.
Disconnect the relief valve drain.
Disconnect the pressure gauge by withdrawing the
clip and pulling out the capillary head.
Undo pipe unions by withdrawing the clips.
Remove 3-way valve.
Sensors
B Check that the appliance is electrically isolated.
Central Heating Flow Temperature Sensor –
Item 36, fig. 2, 60
B Pull-off the connector.
B Release the sensor clip and withdraw the sensor.
B Apply heat transfer paste to the replacement sensor.
Safety Temperature Limiter – Item 6, fig. 2, 60
B Pull-off the connectors.
B Unscrew the sensor.
Flue Temperature Limiter – Item 9, fig. 2, 60
B Pull-off the connectors.
B Unscrew the sensor.
Domestic Hot Water Temperature Sensor –
Item 6.1, fig. 2
B Check that the inlet water valve is closed and the
domestic hot water circuit is drained.
B Release and pull-off the connector.
B Unscrew the sensor.
7 181 465 330-12.1R
Fig. 64
After refitting:
B Fill system, bleed and re-pressurise
(see Installation Instructions).
8.3.5
3-way diverter valve motor
B Switch off the appliance.
B Turn off the service cocks.
B Unplug connector from 3-way valve motor. Refer to
fig. 64.
B Pull out retaining clip.
B Remove motor.
40
6 720 610 599 GB (03.02)
Maintenance
8.3.7
Gas Valve
B Check that the gas cock is turned off.
B Lower the control panel. Refer to fig. 63.
B Pull off the solenoid connections at the rear of the
valve.
B Undo the union, within the inner casing, securing the
valve to the gas/air tube. Refer to fig. 62.
B Remove the white plastic cap from the gas valve.
B Release the gas inlet union at the manifold assembly.
B Unscrew the two screws securing the gas valve
assembly bracket to the back panel and withdraw the
assembly.
B Transfer the bracket and inlet pipe assembly to the
new gas valve.
B Check for gas soundness when the new gas valve
has been fitted.
B Recheck the combustion performance as described
in section 7.1.
8.3.8
Domestic Hot Water Heat Exchanger
B Refer to section 8.2.
B Use new seals when fitting the new heat exchanger.
8.3.9
Electrode assembly
B Refer to section 8.2.
B Use a new seal if the existing seal is damaged.
8.3.10 Pressure gauge
B Drain the appliance.
B Lower the facia. Refer to fig. 63.
B Twist the pressure gauge head anti-clockwise to
release it from the casing. Refer to fig. 2.
B Disconnect the capillary head from the rear of the
diverter valve by withdrawing the clip and pulling out
the head. Refer to fig. 64.
8.3.11 Expansion vessel
B Drain the appliance.
B Undo the union connection at the base of the vessel.
Refer to fig. 2.
B Unscrew the top and bottom fixing screws and
remove the vessel.
B Set the pressure of the new vessel to that required
by the system.
8.3.12 Pressure Relief Valve
B Drain the appliance.
B Disconnect the drain pipe from the valve. Refer to
fig. 30.
B Pull-out the clip securing the valve.
B Pull-out the valve.
B Ensure that the replacement valve is fully entered
before fitting the clip.
8.3.13 Burner
B Refer to section 8.2.
6 720 610 602 - 04.1O
Fig. 65
6 720 610 599 GB (03.02)
41
Maintenance
8.3.14 Flow switch
B Shut the mains water inlet valve and drain the domestic hot water circuit.
B Pull-off the connectors from the micro-switch.
B Unscrew the inlet and union connection and remove
the assembly.
B Reset the domestic hot water flow rate on the new
assembly.
B Transfer components, as necessary, to the new heat
exchanger.
B Ensure that all the seals are in place and all of the
connections are tight before re-commissioning the
appliance.
OUTLET
INLET
6 720 610 602 - 05.10
Fig. 66
8.3.15 Primary Heat Exchanger
B
B
B
B
B
B
B
B
B
B
B
B
B
Drain the appliance.
Check that the gas supply is turned off.
Check that the appliance is electrically isolated.
Remove the fan assembly complete with the gas/air
tube and mixer assembly. Refer to section 8.3.2.
Remove the burner. Refer to section 8.2.
Disconnect the sensors. Refer to section 8.3.6.
Undo the central heating flow union.
Undo the top connection of the pump. Refer to
fig. 63.
Undo the grey plastic cap, next to the top pump connection at the base of the heat exchanger.
Unscrew and remove the condensate trap. Refer to
section 8.2.
Unscrew and remove the two screws securing the
heat exchanger top bracket to the rear panel.
Lift up the flue duct, item 271, refer to fig. 2.
Pull forward from the top and lift the heat exchanger
from the casing.
42
6 720 610 602 - 06.10
Fig. 67
6 720 610 599 GB (03.02)
Appendix
9
Appendix
9.1
Fault Codes
More detailed fault finding procedures are described in the Service booklet for the Engineer number 7 181 465 346.
Display
code
Description
Remedy
A7
Hot water NTC sensor defective.
Check hot water NTC sensor and connecting lead for
circuit breaks/short circuits.
A8
Break in communication
Check connecting lead to programmer
AC
Module not detected.
Check connecting lead between TA211E/TR212E
and Heatronic
b1
Keyed plug not detected.
Insert keyed plug correctly, test and replace if necessary.
C1
Fan speed too low.
Check fan lead and connector, and fan; replace as
necessary.
d3
Jumper 8-9 not detected.
Connector not connected, link missing, underfloor
heating limiter tripped.
E2
CH flow NTC sensor defective
Check CH flow NTC sensor and connecting lead.
E9
Safety temp. limiter in CH flow has tripped.
Check system pressure, check safety temp. limiters,
check pump operation, check fuse on pcb, bleed
appliance.
EA
Flame not detected.
Is gas cock turned on? Check gas supply pressure,
power supply, igniter electrode and lead, ionisation
sensing electrode and lead, flue duct and CO2 level.
F0
Internal error.
Check electrical connector contacts, programmer
interface module ignition leads are not loose; replace
pcb if necessary.
F7
Flame detected even though appliance switched off.
Check electrode assembly, dry pcb. Flue clear?
FA
Flame detected after gas shut off.
Check gas valve and wiring to gas valve. Clean condensation trap and check electrode assembly. Flue
clear?
Fd
Reset button pressed by mistake.
Press reset button again
P1, P2,
P3, P1...
Please wait, initialisation in progress.
24 V fuse blown. Replace fuse.
Table 19
6 720 610 599 GB (03.02)
43
Appendix
9.2
Short parts list
Key
Description
Qty GC
Spare part number
1
Sensor - Flue gas temp.
1
8 729 000 144 0
2
Sensor - CH flow temp.
1
8 714 500 087 0
3
Sensor - DHW flow temp.
1
8 714 500 054 0
4
Control board
1
8 748 300 418 0
5
Gas valve
1
8 747 003 516 0
6
Fan assembly
1
8 717 204 373 0
7
Fan washer
1
8 729 000 183 0
8
Expansion vessel
1
8 715 407 236 0
9
Relief valve
1
8 717 401 012 0
10
Electrode assembly
1
8 718 107 077 0
11
Electrode lead
1
8 714 401 999 0
12
Pump
1
8 717 204 384 0
13
Pressure gauge
1
8 717 208 079 0
14
Burner skin seal
1
8 711 004 168 0
15
Transformer - facia
1
8 747 201 358 0
16
Flow switch
1
8 717 002 110 0
17
3-way diverter valve
1
8 717 010 062 0
18
Heat exchanger washer
1
8 710 103 153 0
19
Washer set Condensation Trap
1
8 710 103 154 0
20
Fuse set
1
8 744 503 010 0
21
Service set Water Valve
1
8 710 503 031 0
22
Domestic Hot Water
Heat Exchanger
1
8 715 406 659 0
23
Primary heat exchanger
1
8 715 406 615 0
Table 20
44
6 720 610 599 GB (03.02)
Appendix
9.3
Heating/hot water output settings
(N.G)
Natural gas G20
Display
code
Heat
output
kW
Heat
input
kW
Gas vol. flow
rate (l/min at
tV/tR =
80/60˚C)
30
8.8
8.9
15.5
40
11.7
11.8
20.7
50
14.6
14.8
25.8
60
17.5
17.7
31.0
70
20.4
20.7
36.1
80
23.4
23.6
41.3
90
26.3
26.6
46.5
100
29.2
29.5
51.6
Table 21
9.4
Heating/hot water output settings
(L.P.G)
Propane
Display code
Heat output kW
Heat input kW
40
11.7
11.8
50
14.6
14.8
60
17.5
17.7
70
20.4
20.7
80
23.4
23.6
90
26.3
26.6
100
29.2
29.5
Table 22
6 720 610 599 GB (03.02)
45
Mains
switch
ON.
46
Repeats 5 times
before lock-out.
Ignition spark for
5 seconds.
Ignition sequence
Fan runs to purge
gas from burner.
No
Burner lights.
Red light ON.
Yes
Fan to
start speed.
Gas valve opens.
Heat input
modulates to
maintain the
delivery
temperature.
Demand
ends.
6 720 610 576 - 24.1O
Gas valve
closes.
Red light
OFF.
Fan runs for
upto 3 mins.
Pump runs
for 30secs.
Pre-heat
mode.**
Domestic hot water function
Pump ON
Diverter valve
operates.
9.5.1
Hot
water
demand.
.
Over temperature
shut-down if water
temperature is 8°C
above set value.
Burner shut-down if
primary temperature
exceeds 94 °C remains
OFF until 78 °C
** NOTE:
The appliance controls can be set to one of
2 modes of operation.
1. “Comfort“ mode Full pre-heat
2. “ECO“ mode a) Operates as an instantaneous combination
boiler.
b) Demand Detection: a short demand (less
than 5 seconds) switches the control to
“Comfort“ mode for 5 mins. Mini pre-heat.
The Factory setting is “Comfort“ mode.
Operational Flow diagrams
Pre-heat
mode.**
Ignition
spark
5 secs
Gas valve shuts.
Pump remains ON.
Burner lights.
Red light ON.
Ignition sequence
Burner remains OFF
until flow temperature
is below set value.
Pre-heat satisfied.
Fan to
start speed.
Gas valve opens.
9.5
Green
light
ON.
Pump ON
Diverter valve
operates.
Appendix
Fig. 68
6 720 610 599 GB (03.02)
Mains
switch
ON.
6 720 610 599 GB (03.02)
Ignition spark for
5 seconds.
Ignition sequence
CH
demand.
Fan runs to purge
gas from burner.
No
Burner lights.
Red light ON.
Pump ON
Fan to
start speed.
Gas valve opens.
Yes
Fan speed
reduces
over 15
secs.
CH demand
satisfied.
Fan min.
speed for
90 secs.
Yes
Gas valve
closes.
Red light
OFF.
No
Boiler
unused for
long
period.*
*
Minimum
heat input
for 15min.
Over temperature
shut-down if water
temperature is 5°C
above set value.
Pump and Fan
run for upto
3 mins.
Boiler
operates to
match
system load
and CH
control
setting.
6 720 610 576 - 25.1O
* NOTE: The sequence ensures that the condensate siphon is not empty
after long OFF periods. (More than 24 hours without a demand).
ce
Burner
stabilises at
start speed
for 5-10 secs
Gas valve shuts.
Pump remains ON.
9.5.2
Repeats 5 times
before lock-out.
Green
light
ON.
Room thermostat
and/or mains
programmer or
link ON
AND
Electronic facia
programmer
(if fitted) ON
AND
CH control knob
ON.
Burner remains OFF
until flow temperature
is below set value.
Appendix
Central heating function
Fig. 69
47
Appendix
EXCELLENCE COMES AS STANDARD
Manufactured exclusively for British Gas by The Bosch Group
Bosch Group, Worcester Heat Systems, Cotswold Way, Warndon, Worcester WR4 9SW.
Telephone: (01905) 754624 Fax: (01905) 754619
Service booklet for the Engineer
for Gas Condensing Boilers
6 720 610 577-00.10
7 181 465 346 GB (03.02) OSW
ZWB 7-29 CC1 GC-Number: 47 108 05
ZB 7-28 CS1 GC-Number: 41 108 02
ZWB 7-27 HE combi GC-Number: 47 311 55
ZWB 7-25 HE combi GC-Number: 47 311 73
ZWB 7-30 HE combi GC-Number: 47 311 74
ZB 7-27 HE system GC-Number: 41 311 49
ZB 7-28 HE system GC-Number: 41 311 58
Greenstar 29 HE Conventional GC-Number: Natural Gas: 41 311 56; LPG: 41 311 57
Table of contents
Table of contents
Warnings
3
Symbols
3
1
1.1
1.2
Layout of Appliance
combi
system
4
4
5
2
2.1
2.2
2.3
2.4
2.5
2.5.1
2.5.2
Bosch Heatronic board functions
Initialisation
Temperature display
Indication of faults
Special programme visualisation
Boiler service functions
First Service Level
Secondary Service Level
6
6
6
6
6
8
8
11
3
3.1
3.2
3.2.1
3.2.2
3.3
3.4
3.4.1
3.4.2
Failure identification procedure
Notes on using the fault code tables
Summary
Appliance faults
Faults that are not displayed
Error codes on the display
Faults that are not displayed
Appliance faults
Programmer faults
13
13
14
14
14
15
42
42
48
4
4.1
4.1.1
4.1.2
Appendix
NTC values
Outside temperature sensor
CH flow NTC sensor, heat store
NTC sensor, constant hot water
NTC sensor and hot water NTC sensor
4.2 Electronic schemes
4.3 List of most important replacement parts
4.4 Approved corrosion inhibitors and
anti-freeze fluids for central
heating water
4.4.1 Frost protection
4.4.2 Sealing agents
4.5 Summary of BDH Information Sheet
on Identifying Corrosion by CFCs
2
52
52
52
52
53
54
55
55
55
55
7 181 465 346 GB (03.02)
Warnings
Warnings
Repairs
B Repairs may only be carried out by an approved
installer!
B Before carrying out any work on the appliance,
switch it off at the master switch!
B Even when the appliance is switched off at the master switch, some components on the PCB control
board inside the control box are still live. Therefore:
B Before carrying out any work on the electrical parts
of the appliance fully disconnect it from the power
supply (e. g. by means of fuse or circuit breaker)!
B Flue ducting must not be modified in any way.
B Use only original spare parts!
Instructions to the customer
B Explain to the customer how the appliance works
and how to operate it.
B Advise the customer that he/she must not make any
modifications to the appliance or carry out any
repairs on it.
7 181 465 346 GB (03.02)
Symbols
Safety instructions in this document
are identified by a warning-triangle symbol and are printed on a grey background.
Signal words indicate the seriousness of the hazard in
terms of the consequences of not following the safety
instructions.
• Caution indicates that minor damage to property
could result.
• Warning indicates that minor personal injury or serious damage to property could result.
• Danger indicates that serious personal injury could
result. In particularly serious cases, lives could be at
risk.
i
Notes are identified by the symbol shown
on the left. They are bordered by horizontal
lines above and below the text.
Notes contain important information in cases where
there is no risk of personal injury or damage to property.
3
Layout of Appliance
1
Layout of Appliance
1.1
combi
120
221.1
349
221.2
234.1
234
27
226
20
102
32.1
29
36
271
6
415
43
9
63
416
358
18
64
423
7
18.1
355
418
6.1
15
8.1
88
295
98
417
4
6 720 610 576-02.2O
Fig. 1
4
6
6.1
7
8.1
9
15
18
18.1
20
27
29
32.1
36
43
63
64
88
98
102
4
Heatronic control
Heat exchanger safety temperature limiter
Hot water NTC sensor
Testing point for gas supply pressure
Pressure gauge
Flue gas temperature limiter
Relief valve
Pump
Pump speed selector switch
Expansion vessel
Automatic air vent
Air gas Mixer unit
Electrode assembly
Temperature sensor in CH flow
CH flow
Adjustable gas flow restrictor
Adjusting screw for min. gas flow volume
3-way valve (combi)
DHW flow switch (combi)
Inspection window
120
221.1
221.2
226
295
234
234.1
271
349
355
358
415
416
417
418
423
Fixing points
Flue duct
Combustion air intake
Fan assembly
Appliance type sticker
Testing point for combustion products
Testing point for combustion air
Flue duct
Cover plate for twin flue duct connection
Plate-type domestic hot water heat exchanger
Condensate trap
Cover plate for cleaning access
Condensate collector
Clip for fixing outer case
Data plate
Siphon
7 181 465 346 GB (03.02)
Layout of Appliance
1.2
system
120
221.1
349
221.2
234.1
234
27
226
20
102
32.1
29
36
271
6
415
43
9
63
416
358
18
64
423
7
18.1
418
15
8.1
295
4
417
6 720 610 596-01.2O
Fig. 2
4
6
7
8.1
9
15
18
18.1
20
27
29
32.1
36
43
63
64
102
120
221.1
221.2
226
295
234
Heatronic control
Heat exchanger safety temperature limiter
Testing point for gas supply pressure
Pressure gauge
Flue gas temperature limiter
Relief valve
Pump
Pump speed selector switch
Expansion vessel
Automatic air vent
Air gas Mixer unit
Electrode assembly
Temperature sensor in CH flow
CH flow
Adjustable gas flow restrictor
Adjusting screw for min. gas flow volume
Inspection window
Fixing points
Flue duct
Combustion air intake
Fan assembly
Appliance type sticker
Testing point for combustion products
7 181 465 346 GB (03.02)
234.1
271
349
358
415
416
417
418
423
Testing point for combustion air
Flue duct
Cover plate for twin flue duct connection
Condensate trap
Cover plate for cleaning access
Condensate collector
Clip for fixing outer case
Data plate
Siphon
5
Bosch Heatronic board functions
2
Bosch Heatronic board functions
2.1
Initialisation
When it is switched on, the appliance performs a selftest which takes about 5 seconds. While the test is in
progress, the display shows the following sequence of
codes:
P1 -> P2 -> P3 -> P4 -> P5 -> P6
On completion of the test sequence the appliance is
ready for operation.
2.2
Temperature display
2.4
Special programme visualisation
The display shows for example 45 – – 45 (continuous working at the minimum sanitary/heating
power)
The display shows alternatively the temperature
and – –. The function is memorised in the Service mode.
• The appliance works continuously at the sanitary or
heating minimum power.
B Press the button
until the symbol – – appears on
the display.
The button
is lighted.
B Turn the temperature control
until function 2.0
appears on the display.
After a short delay, the display shows 1 for minimum
output.
B Turn the temperature control
completely anticlockwise until the display shows 0 .
B Press the button
until the symbol [ ] appears on
the display.
The display shows the heating outlet temperature.
The display shows the current flow temperature in central heating and hot water modes. The display range
extends from 00 ˚C to 99 ˚C.
If a service function requires the display of a temperature greater than 99 ˚C, the display alternates between
initially showing the first digit and then the remaining
two digits.
E.g.: display showing 1. followed by 69. indicates
169˚C.
For outside temperatures, the display shows a minus
sign followed by the negative temperature in alternation.
The display shows for example 55 – – 55
(continuous working at the maximum power)
The display shows alternatively the temperature and – –.
The function is memorised in the Service mode.
2.3
• The appliance works continuously at the maximum
power.
Indication of faults
Faults are indicated by a letter code. This helps to identify and eliminate the cause of the fault quickly and reliably.
The fault codes displayed are grouped into four categories:
• Category 1:
The appliance is disabled until it has been switched
off and then on again.
• Category 2:
The appliance is disabled until the cause of the fault
has been eliminated.
• Category 3:
The appliance continues to operate with limited function.
• Category 4:
The appliance is disabled and locked (
flashes)
until the cause of the fault has been eliminated and
the appliance unlocked.
i
6
Unlocking the appliance:
B Press and hold the
display shows – – .
button until the
B Press the button
until the symbol – – appears on
the display.
The button
is lighted.
B Turn the temperature control
until function 2.0
appears on the display.
After about 5 seconds the display will show 2 for the
maximum power.
B Turn the temperature control
completely anticlockwise until the display shows 0 .
B Press the button
until the symbol [ ] appears on
the display.
The display shows the heating outlet temperature.
Display shows 45 -II- 45 (trap filling programme)
The trap filling programme ensures that the condensation trap is filled after the appliance is first installed or if
it has been switched off for a long period.
The trap filling programme is activated if:
• the appliance is switched on at the master switch
• the burner has not been in operation for at least 48
hours
• the appliance is switched from summer to winter
mode.
7 181 465 346 GB (03.02)
Bosch Heatronic board functions
The next time the central heating or heat store calls for
heat, the appliance is held at a low heat output for 15
minutes. The display shows -II- in alternation with the
CH flow temperature.The factory setting is 1 (enabled).
If the condensation trap is not filled with
water, flue gas can escape!
B The trap filling programme should only
be disabled in order to carry out servicing work.
B Always re-enable the trap filling programme after completing servicing
work.
To switch off the trap filling programme to carry out
servicing work:
B Press and hold the
and
buttons simultaneously until the display shows = =.
The
and
buttons will light up.
B Turn the temperature control
until the display
shows 8.5.
After a short delay, the display then shows the trap
filling programme setting ( 1. = Enabled).
B Turn the temperature control
until the display
shows 0. (= Disabled).
The display and the
and
buttons will flash.
B Press and hold the
and
buttons simultaneously until the display shows [ ].
The trap filling programme is now disabled.
B Regulate the temperature control
and the temperature control
on the previously set positions.
The display shows the heating outlet temperature.
Display shows 00 (venting function)
The first time the appliance is switched on, it automatically activates a one-off venting sequence in which the
heating pump switches on and off at intervals for about
8 minutes.
This function can be activated on Service Level 2, Service Code 7.3, if it is required at any other time.
7 181 465 346 GB (03.02)
7
Bosch Heatronic board functions
2.5
Boiler service functions
2.5.1
First Service Level
Operating
In order to change or check the values of the service
functions:
B Press the button
until the symbol – – appears on
the display.
The button
is lighted.
B Turn the temperature control
until the desired
function number appears on the display.
Once changed or checked the function value:
B Press the button
until the symbol [ ] appears on
the display.
The display shows the heating outlet temperature.
B Regulate the temperature control
and the temperature control
on the previously set positions.
In order to reset the main menu function values to their
default values:
B Power OFF the appliance.
B Press the button
and keep it pressed.
B Switch on the appliance, press and hold the
ton until the
display shows r1 followed by [ ].
but-
Values that can be modified:
Description
Display
Reset Value
.0
Show the last error code.
0 - FF
Clear only
2.0
Identification of the function mode (0 = normal, 1= min, 2 = max)
0-2
0
2.2
Identification of the pump function mode
1-3
2
2.3
Max. output in heat store heating mode
28 - 99
99
2.4
Anti-cycle time1)
0 - 15 min
3 min
2.5
Max. CH flow temperature
35 - 88˚C
88˚C
2.6
Minimum hysteresis in heating mode (∆T)
0 - 30 K
0K
2.7
Activation of automatic anti-cycle time (0 = Disabled; 1 = Enabled)
0, 1
1
3.4
Pump mode
0-3
2)
Table 1 First Service Level; Values that can be modified
1)
2)
8
If appliance is used in conjunction with type TA... programmer, only effective if Service Code 2.7 is set to “0” (= "Disabled”)!
The reset value is dependent on the code plug.
7 181 465 346 GB (03.02)
Bosch Heatronic board functions
Values that can only be read:
Description
Display
Reset Value
.1
Heating outlet temperature.
0 - 99˚C
-
.2
Sanitary outlet temperature.
0 - 99˚C
-
.3
Heat store NTC sensor (ZSB.)
0 - 99˚C
.4
Constant hot water NTC sensor (ZWB.)
0 - 99˚C
-
1.2
Order no. for code plug: 8 714 411 XXX
0 - 255
-
1.4
Temperature voltage signal (Terminal 2) from room thermostat
(eg. TRQ 21, TR 100)
5 - 22 VDC
-
1.5
Specified CH flow temperature from programmer
0 - 99˚C
-
1.6
Outside temperature from TA 211 E or room temperature from
TR 212 E
-20 +30˚C
-
1.7
Status TR 2 (0 = Not present 1 = Frost protection 3 = Auto 4 = Day,
Night 5=Error)
0-4
-
1.8
Terminal 2 on programmer interface module
0 - 24 VDC
-
1.9
Identification code for the external module:
0, 2, 4, 5 = no module connected,
3 = ADM, 6 = TA 211E, 53 = ADM, 56 = TR 212 E).
0 - 8, 53,
56
-
2.9
Instantaneous power.
0 - 99 %
-
3.0
Fan speed
0 - 105
-
3.3
Quality of the ionisation signal:
0 = no ionisation,
1 = weak ionisation,
2 = medium ionisation,
3 = high ionisation.
0-3
-
3.6
Software version
3x2
positions
-
Table 2 First Service Level; Values that can only be read
7 181 465 346 GB (03.02)
9
Bosch Heatronic board functions
Values that can only be read - only left display digit:
Description
Display XY
Reset Value
3.9
External switch (points 8 - 9).
0 = closed
1 = Heating demand
-
4.1
External demand for heat via LSM
0 = closed
1 = Heating demand
-
4.2
Programmable clock:
1st channel (Heating).
0 = closed
1 = Heating demand
-
4.3
Automatic pump shut OFF with RAM module
(point 5)
0 = closed
1 = Heating demand
-
4.4
Heating demand.
0 = closed
1 = Heating demand
-
4.5
Sanitary demand.
0 = closed
1 = Heating demand
-
Table 3 First Service Level; Values that can only be read - only left display digit
Values that can only be read - only right display digit:
Description
Display XY
Reset Value
3.9
External 2-point demand for heat via 230 V AC
(Terminals Ls - Lr)
0 = closed
1 = Heating demand
-
4.0
Heat store demand for heat via
heat store thermostat (Terminals 7-9)
0 = closed
1 = Heating demand
-
4.1
LSM Enable
0 = closed
1 = Heating demand
-
4.2
Programmable clock:
2nd channel (DHW – Maintaining).
0 = closed
1 = Heating demand
-
4.3
Heating demand from TA 211 E
0 = closed
1 = Heating demand
-
4.4
Heat store demand for heat via heat store NTC
sensor
0 = closed
1 = Heating demand
-
4.5
Sanitary heat exchanger temperature maintaining.
0 = closed
1 = Heating demand
-
4.6
Anti-cycle time
0 = closed
1 = Heating demand
-
Table 4 First Service Level; Values that can only be read - only right display digit
10
7 181 465 346 GB (03.02)
Bosch Heatronic board functions
2.5.2
Secondary Service Level
Operation
In order to change or check the values of the service
functions:
B Press buttons
and
simultaneously until the
symbol = = appears on the display.
The buttons
and
are lighted.
B Turn the temperature control
until the desired
function number appears on the display.
Once changed or checked the function value:
B Press buttons
and
simultaneously until the
symbol [ ] appears on the display.
The display shows the heating outlet temperature.
B Regulate the temperature control
and the temperature control
on the previously set positions.
To reset all settings on Service Levels 1 and 2 to the
factory setting:
B Power OFF the appliance.
B Press buttons
and
simultaneously and keep
them pressed.
B Switch on appliance, press and hold the
and
buttons until the display shows r2 followed by [ ].
Values that can be modified:
Description
Display
Reset Value
5.0
Reduced max. heating output
0 - 99 % and sealed
99
5.1
Continuous ignition (for testing ignition without
gas)
0 = off
1 = on
0
5.5
Increased min. heating and heat store charging
output
0 - 99 %
0
5.9
Starting speed option (if flame propagation is
poor, set high starting speed)
0 = First start at low speed;
1 = First start at high speed)
0
6.7
Pump deactivation in HW mode, ZW only.
0 = off, 1 = on
1
6.8
Cycle time for heat exchanger constant hot water
function on ZW model.
0 - 60 min
0
6.9
Constant hot water
0 - 30 min
3
7.3
Venting function
0 = off,
1 = On for 8 cycles then
permanently off (i.e. set to 0)
2 = on
1
7.7
Temperature-dependent output reduction
0 = off;
1 = Heating on
2 = Hot water on
3 = Heating and hot water on
3
8.5
Trap filling programme
0 = off
1 = on
1
Table 5 Secondary Service Level; Values that can be modified
7 181 465 346 GB (03.02)
11
Bosch Heatronic board functions
Values that can only be read:
Description
Display
Reset Value
5.2
Automatic gas igniter status and/or fault
00 - FF
-
9.3
Automatic gas igniter Asic fault code
00 - FF
-
Table 6 Secondary Service Level; Values that can only be read
12
7 181 465 346 GB (03.02)
Failure identification procedure
3
Failure identification procedure
3.1
Notes on using the fault code
tables
In this example: check the flue is clear by testing
the CO2 level.
The procedure is best described with the aid of
an example:
• Work through the table from top to bottom and from
left to right.
• First make a note of the present settings and restore
them before leaving the appliance.
• Read question 1. (Check column)and depending on
the answer (yes or no) read the action required from
the relevant box and carry out the instruction given;
ignore the other answer. For example: if the burner
flame is visible, follow the instructions for yes, i.e.
↓5.!
• ↓5. means go to number 5., ignoring the steps in
between.
EA
and
• If the appliance is locked (
button is flashing),
press the
button. Important: after unlocking the
appliance, always restart it (i.e. switch off and then
on again). Only then is it possible to say whether or
not the fault has been eliminated.
• If the fault has been rectified, the appliance will then
start up without indicating a fault and the fault isolation procedure is complete.
• If the fault is still present after performing the action
specified and, if necessary, restarting the appliance,
move on to the next step in the fault isolation procedure.
• If another fault code is displayed, work through the
fault code table for that code.
flashing.
Flame not detected
Check
Action
B Note the setting of the temperature controls
and
1.
2.
Is a burner flame visible?
Is the gas cock turned on?
.
yes:
↓ 5.
no:
↓ 2.
yes:
↓ 5.
no:
B Open the gas cock.
B Press
, restart the appliance.
EA? ↓3.
3.
Has the thermal cut-out on the gas
cock tripped?
4. ...
...
5. ...
Problem with flue?
B Check CO2 level in combustion
air.
Is CO2 level above 0,2 % ?
yes:
...
no:
↓ ...
yes:
Check flue.
no:
↓ ...
Return to normal operation:
B Press the button
on the display.
until the symbol [ ] appears
B Regulate the temperature control
and the
temperature control
on the previously set
positions.
Table 7
7 181 465 346 GB (03.02)
13
Failure identification procedure
ZWB ...A
Page
X
X
42
Flue gas levels incorrect, CO level
too high
X
X
43
3
X
17
Ignition too harsh, ignition poor.
X
X
44
A8
3
X
X
X
19
Boiler indicates P1, P2, P3 at
start-up and then restarts
with P1,...
X
X
46
AC
3
X
X
X
20
Ad
3
X
b1
2
X
X
X
24
C1
2
X
X
X
25
CC
3
X
X
X
26
d3
2
X
X
X
27
E2
2
X
X
X
28
E9
4
X
X
X
30
EA
4
X
X
X
32
F0
4/
2
X
X
X
F7
4
X
X
FA
4
X
Fd
4
X
22
Loose or broken contact on heat
store NTC sensor
X
X
46
Specified CH flow temperature
from TA... programmer exceeded
X
X
47
Table 9
Programmer faults
Page
A7
TA 211E
and DT 2
15
TR 2 and
TR 212 E
X
ZB ...A
3
Table 8
Excessive burner noise, rumbling
noises
Appliance faults
A5
Appliance faults
Faults that are not displayed
ZB ...A
3.2.2
Page
Appliance faults
ZWB ...A
3.2.1
ZB ...A Conventional
Summary
Category
3.2
Set room temperature not
reached.
X
48
37
Set room temperature
exceeded.
X
X
38
X
49
X
X
39
Set room temperature not
reached.
X
X
41
Set room temperature
exceeded by large amount.
X
50
Excessive fluctuations in
room temperature
X
X
50
Temperature rises instead of
falling
X
X
51
Room temperature too high
in Economy mode
X
X
50
Incorrect or no modulation
X
X
51
Heat store fails to heat up
X
Table 10
14
7 181 465 346 GB (03.02)
Failure identification procedure
3.3
Error codes on the display
A5
flashing.
Heat store NTC sensor 2 defective
Check
Action
B Note the setting of the temperature controls
and
1.
B Press button
.
yes:
B Select service function .3 .
Is a temperature between 0. and
5. displayed?
2.
Heat store NTC:
B Unplug connector.
B Short circuit the connector.
Display changes to temperature
between 99. and 95.
.
B Flue gas connector corroded 1), damaged or
dirty?. Change relative parts.
↓2.
no:
↓3.
yes:
B
B
B
B
Power OFF the appliance.
Change NTC sensor.
Plug the connection wire.
Turn ON the appliance.
A5? ↓3.
no:
B Change the 20-pin connector lead assembly.
↓3.
3.
4.
Temperature between 95. and 99. is
displayed.
B Unplug connector.
After max. 60 sec.:
Does the displayed code change
to a value between 0. and 5.?
B Unplug 20-pin connector from
PCB.
After max. 60 sec.:
Does the displayed code change
to a value between 0. and 5.?
yes:
B
B
B
B
Power OFF the appliance.
Change NTC sensor.
Plug the connection wire.
Turn ON the appliance.
A5? ↓4.
no:
↓4.
yes:
B
B
B
B
B
Power OFF the appliance.
Disconnect the boiler electrical connection.
Change the 20-pin connector lead assembly.
Reconnect the boiler electrical connection.
Turn ON the appliance.
↓5.
no:
7 181 465 346 GB (03.02)
B Make a note of the altered service settings (see
table 1, "First Service Level; Values that can be
modified" at page 8 and table 5, "Secondary
Service Level; Values that can be modified" at
page 11).
B Power OFF the appliance.
B Disconnect the boiler electrical connection.
B Change PCB control board.
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
B Restore service settings previously noted down.
15
Failure identification procedure
A5
flashing.
Heat store NTC sensor 2 defective
Check
5.
Action
To return to normal function mode:
B Press buttons
and
simultaneously.
B Regulate the temperature control
and the
temperature control
on the previously set
positions.
1)
16
For notes, refer to Appendix
7 181 465 346 GB (03.02)
Failure identification procedure
A7
flashing.
Hot water NTC sensor defective
Check
Action
B Note the setting of the temperature controls
and
1.
B Press button
.
yes:
B Select service function .2 .
Is a temperature between 0. and
5. displayed?
2.
Hot water NTC sensor:
B Unplug connector.
B Short circuit the connector.
Display changes to
temperature 99.
.
B Flue gas connector corroded 1), damaged or
dirty? Change relative parts.
↓2.
no:
↓3.
yes:
B
B
B
B
B
B
B
Power OFF the appliance.
Drain the hot water circuit.
Disconnect the boiler electrical connection.
Change NTC sensor.
Plug the connection wire.
Reconnect the boiler electrical connection.
Turn ON the appliance.
A7? ↓3.
no:
B Change the 20-pin connector lead assembly.
↓3.
3.
Temperature between 95. and 99. is
displayed.
B Unplug connector.
After max. 60 sec.:
Does the displayed code change
to a value between 0. and 5.?
yes:
B
B
B
B
B
B
B
B
Power OFF the appliance.
Disconnect the boiler electrical connection.
Change NTC sensor.
Refill the hot water circuit.
Check the built-in NTC sensor for leaks.
Plug the connection wire.
Reconnect the boiler electrical connection.
Turn ON the appliance.
A7? ↓4.
no:
7 181 465 346 GB (03.02)
↓4.
17
Failure identification procedure
A7
flashing.
Hot water NTC sensor defective
Check
4.
B Unplug 20-pin connector from
PCB.
After max. 60 sec.:
Does the displayed code change
to a value between 0. and 5.?
Action
yes:
B
B
B
B
B
Power OFF the appliance.
Disconnect the boiler electrical connection.
Change the 20-pin connector lead assembly.
Reconnect the boiler electrical connection.
Turn ON the appliance.
↓5.
no:
B Make a note of the altered service settings (see
table 1, "First Service Level; Values that can be
modified" at page 8 and table 5, "Secondary
Service Level; Values that can be modified" at
page 11).
B Power OFF the appliance.
B Disconnect the boiler electrical connection.
B Change PCB control board.
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
B Restore service settings previously noted down.
↓5.
5.
To return to normal function mode:
B Press buttons
and
simultaneously.
B Regulate the temperature control
and the
temperature control
on the previously set
positions.
1)
18
For notes, refer to Appendix
7 181 465 346 GB (03.02)
Failure identification procedure
A8
flashing.
No correct electrical connection
Check
1.
TR 2 connected?
Action
yes:
A8? ↓2.
no:
B Power OFF the appliance.
B Connect TR 2.
B Turn ON the appliance.
A8? ↓2.
2.
3.
B Turn switch until it clicks into position.
Mode selector switch is between two
settings
A8? ↓3.
B Power OFF the appliance.
Wiring between TR 2 and TR 212 E
OK?
yes:
• Terminal 3 on TR 2 connected to
Terminal 3 on TR 212 E?
no:
• Terminal 4... Terminal 4....
B Turn ON the appliance.
↓4.
B Rewire correctly as specified in the installation
instructions.
B Turn ON the appliance.
After 90 sec.:
A8? ↓4.
4.
TR 2 defective
7 181 465 346 GB (03.02)
B Power OFF the appliance.
B Change TR 2.
B Turn ON the appliance.
19
Failure identification procedure
AC
flashing.
Module not detected.
(Constant CH flow temperature according to CH temperature control on boiler.)
Check
Action
B Note the setting of the temperature controls
and
1.
B Press button
.
yes:
B Select service function 1.9 .
Code 0., 2., 4., 5. is displayed.
.
No modul detected.
B Disconnect connecting lead between PCB control board and TA 211 E or TA 212 E.
B Re-connect connecting lead.
AC? ↓3.
2.
3.
Are 24 V DC cables routed alongside 230 V AC cables?
no:
↓2.
yes:
B Ensure cable separation conforms to minimum
requirements as per installation instructions and/
or use shielded cable.
no:
↓3.
B Power OFF the appliance.
B Replace connecting lead between PCB control
board and programmer interface module or TA
211 E.
B Turn ON the appliance.
Connecting lead between PCB control board and TA 211 E or TA 212 E
defective.
AC? ↓4.
4.
5.
TA 211 E connected?
B Select service function 1.6 .
Outside temperature between -20
and +30 ˚C is displayed.
Does temperature displayed
match true outside temperature?
yes:
↓5.
no:
↓8.
yes:
↓7.
no:
B Power OFF the appliance.
B Replace outside temperature sensor.
B Turn ON the appliance.
AC? ↓7.
6.
If remote control installed:
B Select service function 1.7 .
Remote control status 0. is displayed .
yes:
AC? ↓7.
no:
20
B Power OFF the appliance.
B Plug the connection wire.
B Turn ON the appliance.
↓7.
7 181 465 346 GB (03.02)
Failure identification procedure
AC
flashing.
Module not detected.
(Constant CH flow temperature according to CH temperature control on boiler.)
Check
7.
Remote control status still 0.?
Action
yes:
B Power OFF the appliance.
Remote control:
B Replace top section.
B Turn ON the appliance.
AC? ↓8.
no:
8.
The PCB control board is damaged.
↓8.
B Make a note of the altered service settings (see
table 1, "First Service Level; Values that can be
modified" at page 8 and table 5, "Secondary
Service Level; Values that can be modified" at
page 11).
B Power OFF the appliance.
B Disconnect the boiler electrical connection.
B Change PCB control board.
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
B Restore service settings previously noted down.
To return to normal function mode:
B Press buttons
and
simultaneously.
B Regulate the temperature control
and the
temperature control
on the previously set
positions.
7 181 465 346 GB (03.02)
21
Failure identification procedure
Ad
flashing.
Heat store NTC sensor 1 not detected (ZB...).
Check
Action
B Note the setting of the temperature controls
and
1.
2.
.
Is connecting lead for heat store
NTC sensor 1 correctly routed, i.e.
not through cable grommet?
yes:
↓2.
no:
B Route connecting lead for heat store temperature sensor as specified in installation instructions.
B Press button
yes:
Is NTC sensor connector corroded, damaged or
dirty?
B Power OFF the appliance.
B Change NTC sensor.
B Turn ON the appliance.
.
B Select service function .3 .
Is a temperature between 0. and
5. displayed?
B Press button
.
Ad? ↓3.
3.
Heat store -NTC 1:
B Unplug connector from PCB control board.
B Short circuit the connector using
wire jumper.
After max. 60 sec:
Display changes to temperature
between 99. and 95.
no:
↓4.
yes:
B Power OFF the appliance.
B Change NTC sensor.
B Turn ON the appliance.
B Press button
.
↓4.
no:
B Make a note of the altered service settings (see
table 1, "First Service Level; Values that can be
modified" at page 8 and table 5, "Secondary
Service Level; Values that can be modified" at
page 11).
B Power OFF the appliance.
B Disconnect the boiler electrical connection.
B Change PCB control board.
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
B Restore service settings previously noted down.
↓4.
22
7 181 465 346 GB (03.02)
Failure identification procedure
Ad
flashing.
Heat store NTC sensor 1 not detected (ZB...).
Check
4.
Temperature between 99. and 95. is
displayed.
B Unplug connector.
After max. 60 sec.:
Does the displayed code change
to a value between 0. and 5.?
Action
yes:
B Power OFF the appliance.
B Change NTC sensor.
B Turn ON the appliance.
no:
B Make a note of the altered service settings (see
table 1, "First Service Level; Values that can be
modified" at page 8 and table 5, "Secondary
Service Level; Values that can be modified" at
page 11).
B Power OFF the appliance.
B Disconnect the boiler electrical connection.
B Change PCB control board.
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
B Restore service settings previously noted down.
To return to normal function mode:
B Press buttons
and
simultaneously.
B Regulate the temperature control
and the
temperature control
on the previously set
positions.
7 181 465 346 GB (03.02)
23
Failure identification procedure
b1
flashing.
The Heatronic does not recognise the code key.
Check
B Power OFF the appliance.
1.
2.
Action
Code plug loose, incorrect or defective.
B Replace code plug, check code number is correct.
B Turn ON the appliance.
b1? ↓3.
3.
24
The PCB control board is damaged.
B Make a note of the altered service settings (see
table 1, "First Service Level; Values that can be
modified" at page 8 and table 5, "Secondary
Service Level; Values that can be modified" at
page 11).
B Power OFF the appliance.
B Disconnect the boiler electrical connection.
B Change PCB control board.
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
B Restore service settings previously noted down.
7 181 465 346 GB (03.02)
Failure identification procedure
C1
flashing.
Fan speed too low
Check
1.
Action
Fan lead connector properly connected?
yes:
↓2.
no:
B Power OFF the appliance.
B Plug in connector.
B Turn ON the appliance.
C1? ↓2.
2.
3.
Is fan lead defective?
B Is impedance reading between the
two connectors for one of the
cores infinity?
Are the differential pressure switch
contacts closed?
B Press button
.
yes:
B Power OFF the appliance.
B Replace fan lead.
B Turn ON the appliance.
C1? ↓3.
no:
↓3.
yes:
↓4.
no:
↓4.
yes:
B
B
B
B
B
B Select service function 3.8 .
Is left digit of display showing 1?
4.
Fan defective?
Power OFF the appliance.
Plug the connection wire.
Replace fan.
Plug the connection wire.
Turn ON the appliance.
C1? ↓5.
no:
5.
The PCB control board is damaged.
7 181 465 346 GB (03.02)
↓5.
B Make a note of the altered service settings (see
table 1, "First Service Level; Values that can be
modified" at page 8 and table 5, "Secondary
Service Level; Values that can be modified" at
page 11).
B Power OFF the appliance.
B Disconnect the boiler electrical connection.
B Change PCB control board.
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
B Restore service settings previously noted down.
25
Failure identification procedure
CC
flashing.
Outside temperature NTC sensor not detected.
(Boiler heating as if outside temperature is -20˚C)
Check
1.
Outside temperature sensor AF2
connected to Terminals A and F on
TA 211 E?
Action
yes:
↓2.
no:
B Power OFF the appliance.
B Connect outside temperature sensor to Terminals A and F on TA 211 E.
B Turn ON the appliance.
CC? ↓2.
2.
26
B Power OFF the appliance.
B Disconnect outside temperature
sensor and test resistance
R = ∞ or R = 0?
B Change the external sensor.
B Turn ON the appliance.
7 181 465 346 GB (03.02)
Failure identification procedure
d3
flashing.
Wrong signal from pin 8-9 (open?).
Check
1.
2.
Action
B Turn ON the appliance.
B Measure voltage between Terminal 4 and Terminal 8.
Voltage ≅ 24 V DC?
yes:
↓2.
no:
↓3.
Existing heat store thermostat connected to Terminals 7, 8 and 9?
yes:
B Power OFF the appliance.
B Fix the additional bridge 8-9 in the right position
and close the screws.
B Turn ON the appliance.
d3? ↓3.
3.
Break in connecting lead?
no:
↓4.
yes:
B Power OFF the appliance.
B Plug the connection wire.
B Turn ON the appliance.
d3? ↓4.
no:
4.
The PCB control board is damaged.
7 181 465 346 GB (03.02)
↓4.
B Make a note of the altered service settings (see
table 1, "First Service Level; Values that can be
modified" at page 8 and table 5, "Secondary
Service Level; Values that can be modified" at
page 11).
B Power OFF the appliance.
B Disconnect the boiler electrical connection.
B Change PCB control board.
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
B Restore service settings previously noted down.
27
Failure identification procedure
E2
flashing.
The heating outlet NTC sensor is damaged.
Check
Action
B Note the setting of the temperature controls
and
1.
B Press button
.
yes:
B Select service function .1 .
Is a temperature between 0. and
5. displayed?
.
The heating outlet NTC sensor is in short circuit:
B Power OFF the appliance.
B Replace CH flow NTC sensor; observe fitting
instructions for NTC sensor when doing so.
B Turn ON the appliance.
E2? ↓2.
2.
Temperature for heating outlet NTC
sensor between 95. and 99. is displayed.
no:
↓2.
yes:
The CH flow NTC sensor is interrupted :
B Power OFF the appliance.
B Replace CH flow NTC sensor; observe fitting
instructions for NTC sensor when doing so.
B Turn ON the appliance.
E2? ↓3.
no:
3.
Check if the 20-pin connector lead
assembly is damaged.
↓3.
B
B
B
B
B
Power OFF the appliance.
Disconnect the boiler electrical connection.
Change the 20-pin connector lead assembly.
Reconnect the boiler electrical connection.
Turn ON the appliance.
E2? ↓4.
4.
28
The PCB control board is damaged.
B Make a note of the altered service settings (see
table 1, "First Service Level; Values that can be
modified" at page 8 and table 5, "Secondary
Service Level; Values that can be modified" at
page 11).
B Power OFF the appliance.
B Disconnect the boiler electrical connection.
B Change PCB control board.
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
B Restore service settings previously noted down.
7 181 465 346 GB (03.02)
Failure identification procedure
E2
flashing.
The heating outlet NTC sensor is damaged.
Check
Action
To return to normal function mode:
B Press buttons
and
simultaneously.
B Regulate the temperature control
and the
temperature control
on the previously set
positions.
7 181 465 346 GB (03.02)
29
Failure identification procedure
E9
and
flashing.
Safety temperature limiter has tripped.
Check
1.
Is the heating pressure between 1
and 2 bar?
Action
yes:
↓2.
no:
B Top up system.
B Vent appliance.
B Press
, restart the appliance.
E9? ↓2.
2.
Is the pump blocked?
yes:
B Unblock the pump.
If pump won’t start:
B Power OFF the appliance.
B Disconnect the boiler electrical connection.
B Change the pump.
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
B Press
, restart the appliance.
E9? ↓3.
3.
Lead disconnected from safety temperature limiters?
no:
↓3.
yes:
B Power OFF the appliance.
B Connect lead.
B Turn ON the appliance.
B Press
, restart the appliance.
E9? ↓4.
4.
B Power OFF the appliance.
B Unplug the connector from the
cut-off device.
B Measure the NTC electrical resistance.
no:
↓4.
yes:
B Change the over heating cut-off device.
B Connect flue gas safety temperature limiter lead.
B Turn ON the appliance.
B Press
, restart the appliance.
E9? ↓5.
R = ∞?
no:
B Connect flue gas safety temperature limiter lead.
B Turn ON the appliance.
↓5.
30
7 181 465 346 GB (03.02)
Failure identification procedure
E9
and
flashing.
Safety temperature limiter has tripped.
Check
5.
Is lead disconnected from CH flow
safety temp. limiter?
Action
yes:
B Power OFF the appliance.
B Reconnect lead.
B Turn ON the appliance.
B Press
, restart the appliance.
↓6.
6.
B Power OFF the appliance.
B Disconnect lead to CH flow safety
temperature limiter.
B Measure the CH flow safety temperature limiter.
R = ∞?
no:
↓6.
yes:
B Change CH flow safety temperature limiter.
B Connect CH flow safety temperature limiter lead.
B Turn ON the appliance.
B Press
, restart the appliance.
E9? ↓7.
no:
B Connect CH flow safety temperature limiter lead.
B Turn ON the appliance.
↓7.
7.
B Power OFF the appliance.
B Remove fuse SI 3 from appliance
PCB control board and test for
continuity.
R = ∞?
yes:
B Change the fuse.
B Turn ON the appliance.
B Press
, restart the appliance.
E9? ↓8.
no:
B Remount the fuse.
B Turn ON the appliance.
↓8.
8.
The PCB control board is damaged.
7 181 465 346 GB (03.02)
B Make a note of the altered service settings (see
table 1, "First Service Level; Values that can be
modified" at page 8 and table 5, "Secondary
Service Level; Values that can be modified" at
page 11).
B Power OFF the appliance.
B Disconnect the boiler electrical connection.
B Change PCB control board.
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
B Restore service settings previously noted down.
31
Failure identification procedure
EA
and
flashing.
No flame ionisations signal
Check
Action
B Note the setting of the temperature controls
and
1.
2.
Is the flame present?
Is the gas cock open?
.
yes:
↓6.
no:
↓2.
yes:
↓3.
no:
B Open the gas cock.
B Press
, restart the appliance.
EA? ↓3.
3.
Is there air in the supply pipe?
yes:
B Vent supply pipe.
B Press
, restart the appliance.
EA? ↓4.
4.
Did the thermal security of the gas
cock lock out?
no:
↓4.
yes:
B Reset security.
B Press
, restart the appliance.
EA? ↓5.
no:
32
↓5.
7 181 465 346 GB (03.02)
Failure identification procedure
EA
and
flashing.
No flame ionisations signal
Check
5.
Natural gas models:
does the building have a supply pressure regulator?
Action
yes:
B Check that it is fitted correctly and functioning
properly and correct if necessary.
B Check supply pressure, inform gas company if
outside correct range.
B Is correct code plug fitted?
B Press
, restart the appliance.
EA? ↓6.
LPG models:
is the flow rate of the gas supply to
the appliance correct?
no:
↓6.
yes:
↓6.
no:
B Is there enough gas in the supply cylinder?
B Is there air in the supply pipe?
B Is the solenoid valve in the "meter cabinet” opening?
B Is the supply pressure OK? (if the supply pressure is too high, check the pressure regulator in
the “meter cabinet” and on the LPG supply cylinder).
B Press
, restart the appliance.
EA? ↓6.
6.
Is the ground connection correct?
yes:
↓7.
no:
B Correct the electrical ground connection.
B Press
, restart the appliance.
EA? ↓7.
7.
Two phase net:
Is there a resistor fitted between Pe
and N?
yes:
↓8.
no:
B Power OFF the appliance.
B Disconnect the boiler electrical connection.
B Insert a 2 MΩ resistance between the ground
and the N connection.
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
B Press
, restart the appliance.
EA? ↓11.
7 181 465 346 GB (03.02)
33
Failure identification procedure
EA
and
flashing.
No flame ionisations signal
Check
8.
Is diaphragm in the mixer unit correctly fitted and functional?
B Open mixer unit (29).
B Check diaphragm for correct orientation, soiling and splitting.
Is diaphragm OK?
Action
yes:
B Close mixer unit.
↓9.
no:
B Insert diaphragm in the fan intake duct as per
installation instructions so that the flaps open
upwards.
B Close mixer unit.
EA? ↓9.
9.
Is the condensation trap blocked?
yes:
B Clean out condensation trap discharge pipe.
B Press
, restart the appliance.
EA? ↓13.
10.
Check the gas valve?
B Power OFF the appliance.
B Unplug the connectors from the
gas valve.
B Measure the gas valve coils I and
II electrical resistance.
R = 164 ± 40Ω ?
no:
↓10.
yes:
B Reconnect the gas valve.
B Turn ON the appliance.
B Press
, restart the appliance.
EA? ↓11.
no:
B Change the gas valve.
B Reconnect the gas valve.
B Turn ON the appliance.
B Press
, restart the appliance.
EA? ↓11.
11.
12.
Problem with flue?
B Check CO2 level in combustion
air.
Is CO2 level above 0,2 % ?
yes:
B Check flue and clean if necessary.
B Press
, restart the appliance.
EA? ↓12.
B Open up heat exchanger - is it
dirty?
no:
↓12.
Is flue gas CO2 level incorrect1)?
yes:
B Adjust to correct level.
B Press
, restart the appliance.
EA? ↓13.
no:
34
↓13.
7 181 465 346 GB (03.02)
Failure identification procedure
EA
and
flashing.
No flame ionisations signal
Check
13.
14.
Action
B Press buttons
and
simultaneously.
B Select service-function 5.1.
Continuous ignition (without gas)
OK?
yes:
Ignition lead connected to ignition
electrodes?
yes:
↓15.
no:
B Connect cable to ignition electrode.
B Press buttons
and
simultaneously.
and
simultaneously.
↓14.
no:
B Press buttons
↓17.
B Press
, restart the appliance.
EA? ↓15.
15.
Ignition cable connector engaged in
switchbox?
yes:
↓16.
no:
B Power OFF the appliance.
B Engage ignition cable connector in switchbox.
B Turn ON the appliance.
B Press
, restart the appliance.
EA? ↓16.
16.
Is the ignition electrical wire
damaged?
yes:
B Power OFF the appliance.
B Change the ignition electrical wire.
B Turn ON the appliance.
B Press
, restart the appliance.
EA? ↓17.
17.
18.
no:
↓17.
yes:
↓19.
B Select service-function 3.3.
Is the ionisation quality 2. or 3. ?
no:
↓18.
Electrode assembly defective?
B Power OFF the appliance.
B Remove electrode assembly.
Electrodes worn out?
yes:
B Replace electrode assembly.
B Turn ON the appliance.
B Press button
.
B Press
, restart the appliance.
EA? ↓19.
no:
B Refit electrode assembly.
B Turn ON the appliance.
B Press
, restart the appliance.
EA? ↓19.
7 181 465 346 GB (03.02)
35
Failure identification procedure
EA
and
flashing.
No flame ionisations signal
19.
Check
Action
Check if the 20-pin connector lead
assembly is damaged.
B
B
B
B
B
Power OFF the appliance.
Disconnect the boiler electrical connection.
Change the 20-pin connector lead assembly.
Turn ON the appliance.
Reconnect the boiler electrical connection.
B Press
, restart the appliance.
EA?
B Power OFF the appliance.
↓20.
20.
The PCB control board is damaged.
B Make a note of the altered service settings (see
table 1, "First Service Level; Values that can be
modified" at page 8 and table 5, "Secondary
Service Level; Values that can be modified" at
page 11).
B Power OFF the appliance.
B Disconnect the boiler electrical connection.
B Change PCB control board.
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
B Restore service settings previously noted down.
To return to normal function mode:
B Press buttons
and
simultaneously.
B Regulate the temperature control
and the
temperature control
on the previously set
positions.
1)
36
See installation instructions
7 181 465 346 GB (03.02)
Failure identification procedure
F0
(and possibly
) flashing.
Internal failure
Check
Action
B Note the setting of the temperature controls
and
1.
2.
3.
.
B Press buttons
and
simultaneously.
B Select service function 9.3 .
A service code is displayed.
B Enter figure displayed in customer service record.
B Select service function 5.2 .
A service code is displayed.
B Enter figure displayed in customer service record.
flashing?
↓2.
↓3.
yes:
B Press button
.
B Initiate demand for heat by pressing
button
and then press again after 30 seconds to cancel.
B Initiate two more demands for heat as above.
F0? ↓4.
no:
4.
The PCB control board is damaged.
↓4.
B Make a note of the altered service settings (see
table 1, "First Service Level; Values that can be
modified" at page 8 and table 5, "Secondary
Service Level; Values that can be modified" at
page 11).
B Power OFF the appliance.
B Disconnect the boiler electrical connection.
B Change PCB control board.
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
B Restore service settings previously noted down.
To return to normal function mode:
B Press buttons
and
simultaneously.
B Regulate the temperature control
and the
temperature control
on the previously set
positions.
7 181 465 346 GB (03.02)
37
Failure identification procedure
F7
and
flashing.
Although appliance switches off, flame still detected
1.
Check
Action
Electrode(s) dirty or defective.
B Power OFF the appliance.
B Replace electrode assembly.
B Turn ON the appliance.
B Press
, restart the appliance.
F7? ↓2.
2.
B Power OFF the appliance.
B Disconnect the boiler electrical
connection.
B Remove PCB control board.
PCB control board damp?
yes:
B Dry PCB control board (e.g. with hair dryer).
B Look for point where damp is entering switchbox
and seal as necessary (cable grommets properly
fitted, ...?).
B Refit PCB control board.
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
B Press
, restart the appliance.
F7? ↓3.
3.
4.
38
Problem with flue?
B Check CO2 level in combustion
air.
Is CO2 level above 0,2 % ?
The PCB control board is damaged.
no:
↓3.
yes:
B Check flue and repair or replace if necessary.
no:
↓4.
B Make a note of the altered service settings (see
table 1, "First Service Level; Values that can be
modified" at page 8 and table 5, "Secondary
Service Level; Values that can be modified" at
page 11).
B Power OFF the appliance.
B Disconnect the boiler electrical connection.
B Change PCB control board.
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
B Restore service settings previously noted down.
7 181 465 346 GB (03.02)
Failure identification procedure
FA
and
flashing.
Although appliance switches off, flame still detected
Check
Action
B Note the setting of the temperature controls
and
.
B Power OFF the appliance.
1.
Condensation trap blocked?
yes:
B Clean condensation trap discharge pipe.
B Press
, restart the appliance.
FA? ↓2.
2.
Electrode assembly defective?
B Power OFF the appliance.
B Remove electrode assembly.
Electrode assembly burnt out?
no:
↓2.
yes:
B Replace electrode assembly.
B Turn ON the appliance.
B Press
, restart the appliance.
FA?
B Power OFF the appliance.
↓3.
no:
B Refit electrode assembly.
B Turn ON the appliance.
B Press
, restart the appliance.
FA? ↓3.
3.
Problem with flue?
B Check CO2 level in combustion
air.
Is CO2 level above 0,2 % ?
yes:
B Check flue and repair or replace if necessary.
B Press
, restart the appliance.
FA?
B Power OFF the appliance.
↓4.
no:
4.
The gas valve is damaged.
↓4.
B Change the gas valve.
B Turn ON the appliance.
B Press
, restart the appliance.
FA?
B Power OFF the appliance.
↓5.
7 181 465 346 GB (03.02)
39
Failure identification procedure
FA
and
flashing.
Although appliance switches off, flame still detected
5.
Check
Action
Check if the 20-pin connector lead
assembly is damaged.
B
B
B
B
B
Power OFF the appliance.
Disconnect the boiler electrical connection.
Change the 20-pin connector lead assembly.
Turn ON the appliance.
Reconnect the boiler electrical connection.
B Press
, restart the appliance.
FA?
B Power OFF the appliance.
↓6.
6.
40
The PCB control board is damaged.
B Make a note of the altered service settings (see
table 1, "First Service Level; Values that can be
modified" at page 8 and table 5, "Secondary
Service Level; Values that can be modified" at
page 11).
B Power OFF the appliance.
B Disconnect the boiler electrical connection.
B Change PCB control board.
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
B Restore service settings previously noted down.
7 181 465 346 GB (03.02)
Failure identification procedure
Fd
Button
and
flashing.
pressed without necessity
Check
1.
Button
Action
is flashing.
B Press
, restart the appliance.
Fd? ↓2.
2.
The PCB control board is damaged.
7 181 465 346 GB (03.02)
B Make a note of the altered service settings (see
table 1, "First Service Level; Values that can be
modified" at page 8 and table 5, "Secondary
Service Level; Values that can be modified" at
page 11).
B Power OFF the appliance.
B Disconnect the boiler electrical connection.
B Change PCB control board.
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
B Restore service settings previously noted down.
41
Failure identification procedure
3.4
Faults that are not displayed
3.4.1
Appliance faults
Excessive burner noise, rumbling noises
Check
Action
B Note the setting of the temperature controls
and
1.
Does the gas supply type match the
specifications on the appliance identification plate?
.
yes:
↓2.
no:
B Convert appliance to correct gas type.
↓2.
2.
3.
4.
B Test gas supply pressure - OK?
Does pressure match figure specified in installation instructions?
yes:
↓3.
no:
B Decommission appliance.
For natural gas:
B Notify gas company.
Problem with flue?
B Check CO2 level in combustion
air.
Is CO2 level above 0,2 % ?
yes:
B Check flue and repair or replace if necessary.
no:
↓3.
Cascade system:
Is the appliance min. output high
enough to open the shut-off device?
yes:
↓5.
no:
B Press buttons
and
simultaneously.
B Select Service Function 5.5 .
B Increase min. output.
5.
6.
Is appliance’s internal air/flue channel leaking or blocked?
B Open up heat exchanger and
inspect.
B Remove silencer, flue duct and air
flow limit.
B Open trap and inspect.
Air channels dirty/clogged, seals
defective or not correctly fitted?
yes:
B Repair or replace components.
B Grease seal before fitting.
B Make sure it is fitted in correct position.
no:
↓6.
B Measure CO2 levels.
yes:
B Adjust CO2 level as per installation instructions.
no:
B
B
B
B
B
B
CO2 levels in flue gas at min and
max output do not match figures
specified in installation instructions.
42
Turn off gas cock.
Power OFF the appliance.
Change the gas valve.
Open the gas cock.
Turn ON the appliance.
Check appliance for leaks.
7 181 465 346 GB (03.02)
Failure identification procedure
Excessive burner noise, rumbling noises
7.
Check
Action
B Press buttons
and
simultaneously.
B Select service-function 5.9.
0 is displayed.
B Set to 1 for high start-up speed.
Flue gas levels incorrect, CO level too high
Check
1.
Does the gas supply type match the
specifications on the appliance identification plate?
Action
yes:
↓2.
no:
B Convert appliance to correct gas type.
↓2.
2.
3.
4.
5.
yes:
↓3.
no:
B Decommission appliance.
B Notify gas company.
Problem with flue?
B Check CO2 level in combustion
air.
Is CO2 level above 0,2 % ?
yes:
B Check flue and repair or replace if necessary.
no:
↓4.
Flue gas CO2 levels measured at
min. and max. load do not match
specified levels?
B Measure CO2 levels.
yes:
B Adjust CO2 levels.
no:
↓5.
yes:
B Reduce gas volumetric flow rate by means of
adjusting screw on gas valve and/or gas flow
restrictor.
B Check CO2 adjustment.
no:
↓6.
B Test gas supply pressure - OK?
Gas volumetric flow too high when
CO2 level correctly set.
6.
7 181 465 346 GB (03.02)
B
B
B
B
B
B
Turn off gas cock.
Power OFF the appliance.
Change the gas valve.
Open the gas cock.
Turn ON the appliance.
Check appliance for leaks.
43
Failure identification procedure
Ignition too harsh, ignition poor
Check
Action
B Note the setting of the temperature controls
and
1.
2.
.
B Press buttons
and
simultaneously.
B Select service-function 5.1.
Continuous ignition (without gas)
OK?
yes:
↓6.
no:
↓2.
Ignition lead connected to ignition
electrodes?
yes:
↓3.
no:
B Connect cable to ignition electrodes.
B Press button
.
Ignition poor? ↓3.
3.
Ignition cable connector engaged in
switchbox?
yes:
↓4.
no:
B Power OFF the appliance.
B Engage ignition cable connector in switchbox.
B Turn ON the appliance.
B Press button
.
Ignition poor?
B Power OFF the appliance.
↓4.
4.
Is the ignition electrical wire damaged?
yes:
B Power OFF the appliance.
B Change the ignition electrical wire.
B Turn ON the appliance.
B Press button
.
Ignition poor?
B Power OFF the appliance.
↓5.
5.
Electrode assembly defective?
B Power OFF the appliance.
B Remove electrode assembly.
Electrodes worn out?
no:
↓5.
yes:
B Replace electrode assembly.
B Turn ON the appliance.
B Press
, restart the appliance.
Ignition poor? ↓6.
no:
B Refit electrode assembly.
B Turn ON the appliance.
B Press
, restart the appliance.
Ignition poor? ↓6.
44
7 181 465 346 GB (03.02)
Failure identification procedure
Ignition too harsh, ignition poor
Check
6.
7.
8.
9.
Action
Does the gas supply type match the
specifications on the appliance identification plate?
yes:
↓7.
no:
B Carry out gas type conversion as described in
installation instructions.
B Test gas supply pressure - OK?
yes:
↓8.
no:
B Decommission appliance.
B Notify gas company.
Problem with flue?
B Check CO2 level in combustion
air.
Is CO2 level above 0,2 % ?
yes:
B Check flue and repair or replace if necessary.
no:
↓9.
Flue gas CO2 levels measured at
min. and max. load do not match
specified levels.
yes:
B Adjust CO2 level as per installation instructions.
no:
↓10.
↓9.
B Measure CO2 levels.
10.
Burner not correctly fitted or defective?
B Remove burner.
Cover fixings not tight or seal
defective or not correctly fitted or
burner defective!
B Replace burner and seal if necessary.
B Ensure seal is fitted in correct position.
To return to normal function mode:
B Press buttons
and
simultaneously.
B Regulate the temperature control
and the
temperature control
on the previously set
positions.
7 181 465 346 GB (03.02)
45
Failure identification procedure
Loose or broken contact on heat store NTC sensor
1.
Check
Action
Heat store NTC sensor lead is not
fitted as described in the installation
instructions (i.e. the cable does not
pass through the cable grip in the
switchbox).
B Record condition of appliance as found in customer service record.
B Route cable as specified in installation instructions.
Boiler indicates P1, P2, P3 at start-up and then restarts with P1..
Check
1.
Fuse T 1,6 A (312) defective.
Action
yes:
B Turn ON the appliance.
B Change the fuse.
B Power OFF the appliance.
Start sequence not completed? ↓2.
no:
2.
46
The PCB control board is damaged.
↓2.
B Make a note of the altered service settings (see
table 1, "First Service Level; Values that can be
modified" at page 8 and table 5, "Secondary
Service Level; Values that can be modified" at
page 11).
B Power OFF the appliance.
B Disconnect the boiler electrical connection.
B Change PCB control board.
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
B Restore service settings previously noted down.
7 181 465 346 GB (03.02)
Failure identification procedure
Specified CH flow temperature from TA... programmer exceeded
Check
Action
B Note the setting of the temperature controls
and
.
If outside-temperature controlled programmer (TA...) is connected to boiler:
• The anti-cycle time is adjusted by the programmer to the suit the system.
• The factory setting for the anti-cycle time (3 min.) and the heating mode hysteresis setting, if applicable, are deactivated.
• In cyclic mode, the switching of the boiler on or off is subject to a time delay in order to prevent divergence between the average CH flow temperature and the specified CH flow temperature.
As a result (depending on the heat draw), the specified CH flow temperature is briefly exceeded.
In extreme cases, it can happen that the burner does not switch off until the maximum CH flow temperature is reached even though a lower CH flow temperature has been specified.
1.
B Press button
.
B Select service-function 2.7.
Read off status of automatic anticycle time (0 = Disabled, 1 = Enabled).
2.
B Select service-function 2.4.
Read off anti-cycle time setting
(0 ... 15 min).
B Disable automatic anti-cycle time, i.e. change
setting to 0.
B Set anti-cycle time as required, e.g. factory setting 3 min.
To return to normal function mode:
B Press buttons
and
simultaneously.
B Regulate the temperature control
and the
temperature control
on the previously set
positions.
Hot water has unpleasant odour or is dark colour
Check
Action
This is generally caused by the formation of hydrogen sulphide by sulphate-reducing bacteria. Such bacteria are
found in water which is very low in oxygen and live off the hydrogen produced by the anode.
1.
B Clean the hot water cylinder.
B Replace the sacrificial anode.
B Heat cylinder to a temperature ≥60˚C
2.
B Replace magnesium sacrificial anode with
impressed-current anode.
The conversion costs are payable by the operator!
7 181 465 346 GB (03.02)
47
Failure identification procedure
Condensation in the flue pipe
1.
3.4.2
Check
Action
Is diaphragm in mixer unit fitted correctly (see installation instructions)?
B Open mixer unit (29).
B Check diaphragm for correct orientation, soiling and splitting.
B Fit diaphragm as per installation instructions or
replace.
B Close mixer unit.
Programmer faults
Set room temperature not reached (TR 2 and TR 212 E)
Check
1.
Thermostatic valve(s) set too low?
Action
yes:
B Turn up thermostatic valve(s).
↓2.
2.
3.
48
CH flow temperature control on
boiler set too low?
Air in the heating system.
no:
↓2.
yes:
B Turn up CH flow temperature control.
no:
↓3.
B Power OFF the appliance.
B Check appliance and system for water leaks and
repair as necessary.
B Top up system.
B Select Service Function 7.3 .
Select 1 (on, automatically deactivated) and confirm.
B Vent appliance.
B Vent radiators.
B Turn ON the appliance.
7 181 465 346 GB (03.02)
Failure identification procedure
Set room temperature not reached (TA 211 E und DT 2)
Check
1.
Thermostatic valve(s) set too low?
Action
yes:
B Turn up thermostatic valve(s).
↓2.
2.
Heating characteristic set too low?
no:
↓2.
yes:
B Correct heating characteristic.
↓3.
3.
4.
CH flow temperature control on
boiler set too low?
Is heat store temperature unreachable (CH flow temperature control set
too low)?
no:
↓3.
yes:
B Turn up CH flow temperature control.
↓4.
no:
↓4.
yes:
B Turn up CH flow temperature control.
↓5.
no:
5.
Air in the heating system.
7 181 465 346 GB (03.02)
↓5.
B Power OFF the appliance.
B Check appliance and system for water leaks and
repair as necessary.
B Top up system.
B Select Service Function 7.3 .
Select 1 (on, automatically deactivated) and confirm.
B Vent appliance
B Vent radiators.
B Turn ON the appliance.
49
Failure identification procedure
Set room temperature exceeded by large amount
Check
1.
Do radiators get too hot?
Action
yes:
TR 2:
B Decrease setting of “Heating” control
TA 211 E:
B Correct heating characteristic.
↓2.
2.
Bad choice of location for programmer, e.g. outside wall, near window,
in draught, on hollow wall, etc.
no:
↓2.
yes:
B Select better installation location.
-orB Fit external room thermostat.
↓3.
no:
↓3.
B Turn down thermostatic valve(s).
3.
Excessive fluctuations in room temperature (TA 211 E)
Check
1.
Periodic effect of external heat on
room, e.g. from sunshine, lighting, TV,
separate stove, fire, etc.
Action
yes:
↓2.
no:
2.
B Eliminate external heat sources if possible.
↓2.
B Select better installation location.
-orB Fit external room thermostat.
Bad choice of location for programmer, e.g. outside wall, near window,
in draught, on hollow wall, etc.
Room temperature too high in Economy mode
Check
Building retains heat well
50
Action
yes:
B Set economy temperature lower .
or
B Set to Frost Protection instead of Economy.
or
B Set start time for Frost protection/Economy
earlier.
7 181 465 346 GB (03.02)
Failure identification procedure
Temperature rises instead of falling
Check
Action
Timer clock (DT 2) incorrectly set
B Check setting and correct as necessary.
Incorrect or no modulation
Check
Action
Programmer incorrectly wired
B Check wiring against wiring diagram and correct
as necessary.
7 181 465 346 GB (03.02)
51
Appendix
4
Appendix
4.1
NTC values
4.1.1
Outside temperature sensor
4.1.2
Outside temperature
(˚C)
Measurement
tolerance ±10%
Ω)
Resistance (Ω
-20
2 392
-16
2 088
-12
1 811
-8
1 562
-4
1 342
0
1 149
4
984
8
842
10
781
15
642
20
528
25
436
Table 11
CH flow NTC sensor, heat store NTC sensor, constant hot water NTC sensor and
hot water NTC sensor
Temperature (˚C)
Measurement
tolerance ±10%
Ω)
Resistance (Ω
20
14 772
25
11 981
30
9 786
35
8 047
40
6 653
45
5 523
50
4 608
55
3 856
60
3 243
65
2 744
70
2 332
75
1 990
80
1 704
85
1 464
90
1 262
95
1 093
100
950
Table 12
52
7 181 465 346 GB (03.02)
Appendix
4.2
Electronic schemes
o - orange g - green bl - black
r - red
p - purple
33
365
364
61
317
366
363
367
ECO
4.1
25 V
153
230V/AC
230 V
310
136
135
312
328
302
313
151
318
315
124 789
L N Ns Ls LR
161
p
p
p
300 314
84
M
96
328.1
9
M
mains supply
18
g
6
M
g
o
r
r
o
226
52
52.1
56
o
o
bl
bl
bl
bl
36
bl
6.1
32
6 720 610 576-08.2O
4.1
6
6.1
6.3
18
32
33
36
52
52.1
56
61
84
96
135
136
151
153
161
226
300
302
310
312
313
314
315
317
318
328
Ignition transformer
Heat exchanger overheat cut-out
Flue gas NTC sensor
Hot water sensor
Central heating pump
Flame sensing electrode
Spark electrodes
Temperature sensor in CH flow
Safety gas valve 1
Safety gas valve 2
CE 428 gas valve
Reset button
Motor (ZWB/ZB)
Microswitch, water switch (ZWB)
Main power switch
Heating outlet temperature potentiometer
Fuse T 2,5 A, 230 V AC
Transformer
Bridge
Fan
Code key
Ground electrical connection
Sanitary outlet temperature potentiometer
Fuse T 1,6 A, 24 V DC
Fuse T 0,5 A, 5 V DC
Strip connector for TA 211 E fitted programmer
Terminal block for programmer
Digital display
Internal programmable clock connection
230 V AC connection
7 181 465 346 GB (03.02)
328.1
363
364
365
366
367
Bridge
Flame presence led
Electrical power led (0/I)
Chimney cleaner button
Technique service button
ECO button
53
Appendix
4.3
List of most important replacement parts
Component
Order no.
Remarks
Switchbox
PCB control
board
8 748 300 385
Transformer
8 747 201 358
Ignition lead
8 714 401 999
20-pin connector lead assembly
8 714 402 087
20-pin connector lead assembly
8 714 402 086
Fuse
1 904 552 730
T 0,5 A
Fuse
1 904 552 740
T 1,6 A
Fuse
1 904 521 342
T 2,5 A
Set of fuses
8 744 503 010
Switchbox kpl.
8 717 207 514
with DT 2
Switchbox kpl.
8 717 207 513
without DT 2
Component
Order no.
Remarks
Temperature
sensor, CH flow
8 714 500 087
NTC
Electrode
assembly
8 718 107 077
Gas valve
Gas valve
8 747 003 516
CE 427
ZB...
Other components
ZWB...
Fan
8 717 204 343
Gas supply pipe
8 710 725 500
Plate-type heat
exchanger
8 715 406 651
Overflow trap
8 710 725 328
Diaphragm in the
mixer unit
8 715 505 801
ZWB...
Table 13
Code plug included in
Conversion kit
G20 -> G31
7 710 149 048
ZWB
7/11-29 A
Conversion kit
G31 -> G20
7 710 239 084
ZWB
7/11-29 A
Conversion kit
G20 -> G31
7 710 149 049
ZB
7/11-28 A
Conversion kit
G31 -> G20
7 710 239 085
ZB
7/11-28 A
Conversion kit
G20 -> G31
7 710 149 044
ZWB
7/11-27 A
Conversion kit
G31 -> G20
7 710 239 080
ZWB
7/11-27 A
Conversion kit
G20 -> G31
7 710 149 045
ZB
7/11-27 A
Conversion kit
G31 -> G20
7 710 239 081
ZB
7/11-27 A
8 729 000 144
110˚C
Heat exchanger
Temperature
limiter
Table 13
54
7 181 465 346 GB (03.02)
Appendix
4.4
Approved corrosion inhibitors and
anti-freeze fluids for central
heating water
If any system water treatment is required then
only products suitable for use with Aluminium
shall be used i.e Fernox- Copal or Superconcentrate or Sentinal X100, in accordance with the
manufacturers instructions. The use of any other
substances will invalidate the guarantee. The pH
value of the system water must be less than 8 or
the appliance guarantee will be invalidated.
4.4.1
Frost protection
B Add a suitable anti-freeze fluid to the water in the
central heating system.
Suitable products are available from Betz-Dearborn
Tel.: 0151 4209563, Fernox Tel.: 01799 550811
and Salamander Tel.: 0121 378 0952.
4.4.2
Sealing agents
B In our experience, the addition of sealing agents to
the water in the central heating system can cause
problems (deposits in the heat exchanger). For that
reason we advise against their use.
4.5
Summary of BDH Information
Sheet on Identifying Corrosion by
CFCs
The presence of halogenated hydrocarbons in the combustion air causes surface corrosion on affected metals. Particularly susceptible is the combustion chamber
and the heat exchanger surfaces (including stainless
steel) as well as the metal components in the flue
socket, flue pipe connections and in the chimney.
The halogen compounds present in the combustion air
produce highly corrosive hydrochloric acid in the flame
and in some cases - depending on the precise composition of the combustion air - hydrofluoric acid, both of
which accumulate in the boiler and remain active over
long periods.
In order to limit the damage, the source of the air contamination must be located and sealed off. If this is not
possible, the combustion air must be drawn from an
alternative clean source.
Halogens can occur in the following locations:
Commercial and industrial sources
Dry cleaners
Trichloroethylene, tetrachloroethylene, fluorinated hydrocarbons
Degreasing baths
Perchloroethylene, trichloroethylene, methyl chloroform
Printers
Trichloroethylene
Hairdressers
Aerosol spray propellants,
hydrocarbons containing fluorine and chlorine (freons)
Sources in the home
Cleaning and
degreasing
agents
Perchloroethylene, methyl
chloroform, trichloroethylene,
methylene chloride, carbon
tetrachloride, hydrochloric
acid
Home workshops
Solvents and thinners
Various chlorinated hydrocarbons
Spray cans
Chlorofluorohydrocarbons
(freons)
Table 14
7 181 465 346 GB (03.02)
55
Users Instructions and
Customer Care Guide
RD 532 Condensing boiler
RD 428 Condensing boiler
6 720 611 441-00.1O
6 720 610 600 GB (04.06) OSW
ZWB 7-32 RD 532 GC-Number: 47 108 13
ZB 7-28 RD 428 GC-Number: 41 108 07
Contents
Contents
Excellence comes as standard
4
Safety precautions
5
1
General notes
6
2
Controls
10
3
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
Operating the Appliance
Preparation
Switching the Appliance On/Off
Switching on the Central Heating
Controlling Central Heating
RD 532 Boilers: Setting the Hot Water Temperature
Summer Mode, Hot Water Only (RD 532 Appliances)
Frost protection (RD 532 Appliances)
Fault Condition
11
11
13
14
14
15
16
16
17
4
Tips on saving energy
18
5
General Information
19
6
Maintaining your appliance
20
7
Service
20
8
Fault or breakdown
21
2
6 720 610 600 GB (04.06)
Contents
9
Your guarantee
22
10
Guarantee registration
23
11
Operating Instructions Quick Reference
24
6 720 610 600 GB (04.06)
3
Excellence comes as standard
Excellence comes as standard
Thank you for purchasing an RD 532/RD 428 condensing appliance.
The RD 532/RD 428 Series has been developed by the Bosch
Group and the strictest quality control standards are demanded
throughout every stage of production.
Indeed, the Bosch Group have led the field in innovative appliance
design and performance for many years.
The result is that your new RD 532/RD 428 appliance offers you
the very best of everything – quality, efficiency, economical running costs, proven reliability and value for money.
What’s more, you also have the assurance of our no nonsense
2 year parts and labour guarantee.
And it’s backed up by British Gas - Offering a complete maintenance scheme to keep your boiler operating at peak condition and
efficiency.
No wonder that more and more people are agreeing that when it
is gas, it has to be a British Gas/Scottish Gas Condensing appliance.
Benchmark
The “Benchmark” initiative is the new code of practice to encourage the correct installation, commissioning and servicing of
domestic central heating boilers and system equipment.
The “log-book” is a vital document that must be completed by the
installer at the time of installation. It confirms that the boiler has
been installed and commissioned according to the manufacturers
instructions.
Without the completion of the “log-book”, manufacturers may
refuse to respond to a call–out from a householder, who will be
advised that he or she must call back the installer, who has not fulfilled his obligations to record the information required by the initiative.
4
6 720 610 600 GB (04.06)
Safety precautions
Safety precautions
Gas Safety (Installation and Use) Regulations 1998
It is the law that all gas appliances are installed by a competent
person in accordance with the above regulations. Failure to install
appliances correctly could lead to prosecution. It is in your interest, and that of safety, to ensure compliance with the law.
If you smell gas:
B Turn off gas service cock at the meter.
B Open all doors and windows.
B Do not operate any electrical switches.
B Do not smoke.
B Extinguish any naked flames.
B Call your gas company.
If you smell fumes from the appliance:
B Switch off appliance.
B Open windows and doors.
B Inform your heating engineer.
Fitting and modifications
B Fitting of the appliance or any modifications to the appliance
may only be carried out by a competent person.
B Flue systems must not be modified in any way.
Maintenance
B We recommend that you take out a maintenance contract
with a competent installer and have the appliance serviced at
regular intervals.
B Ensure that your Service Engineer uses only genuine spare
parts!
6 720 610 600 GB (04.06)
5
General notes
Combustible materials
B Do not store or use any combustible materials (paper, thinners, paints etc.) in the vicinity of the appliance.
Health and safety
B This appliance contains no asbestos products.
B There is no potential hazard due to the appliance being electrically unsafe.
B There are no substances used in the construction that are a
potential hazard in relation to the COSHH Regulations (Control of Substances Hazardous to Health Regulations 1988).
Combustion Air/Ambient Air
B Keep combustion air/ambient air free of corrosive substances
(e.g. halogenated hydrocarbons which contain chlorine or fluorine compounds). In this way corrosion can be prevented.
1
General notes
To get the best from your appliance please read these instructions carefully.
Sealed heating systems
The appliance is fitted to a sealed heating system which is prepressurised. Your installer will tell you of the minimum and maximum pressure which must be indicated on the pressure gauge.
Check regularly that the pressure is maintained and contact your
installer or maintenance engineer if there is a permanent significant drop in the pressure. If the system loses pressure it should
be repressurised and the cause of the fall investigated.
Central heating systems
During the first few hours of operation of the central heating system, check that all radiators are being heated at an even rate. If
the top of a radiator is at a lower temperature than the bottom then
it should be vented by releasing air through the venting screw at
the top of the radiator. Ask your installer to show you how this is
6
6 720 610 600 GB (04.06)
General notes
done. Repeated venting will reduce the quantity of water in the
system and this must be replenished for safe and satisfactory
operation of the appliance.
Should water leaks be found in the system or excessive venting is
required then a service engineer must be contacted to inspect the
installation and rectify any fault.
Only additives that are compatible with aluminium may be used in
the system. Any incompatible additive used will invalidate the
guarantee.
Condensate drain
This is a condensing appliance and the terminal will, at times, give
out a plume of water vapour. This is quite normal.
The appliance produces quantities of condense which is discharged regularly through the siphon.
Clearances
Your installer will have provided adequate space around the appliance for safety and servicing access. Do not restrict this space
with the addition of cupboards, shelves etc. next to the appliance.
Left-hand side
10 mm
Right-hand side
10 mm
In Front
600 mm
Above Casing (Vert. Flue)
75 mm
Above Flue Turret
30 mm
Below
200 mm
Table 1
Room thermostat
A room thermostat may be fitted to control the central heating.
Refer to the instructions supplied with the thermostat for information on siting and setting. A programmable thermostat may also
be used with this appliance to provide additional timed control of
the central heating.
6 720 610 600 GB (04.06)
7
General notes
Thermostatic radiator valves
It is recommended that this type of valve is fitted to all the radiators except one, usually radiator where the room thermostat is fitted. They should conform to the requirements of BS2767:10.
Showers, bidets, taps and mixing valves – RD 532 Boilers
Standard hot and cold taps and mixing valves must be suitable for
operating at mains pressure. Thermostatically controlled or pressure equalising shower valves will guard against the flow of water
at too high a temperature.
Hot and cold mains fed water can be supplied directly to an overrim flushing bidet subject to local water company requirements.
With all mains fed systems the flow of water from individual taps
will vary with the number of outlets operated simultaneously and
the cold water mains supply pressure to the property.
Flow balancing using “ball-o-fix” type valves is recommended to
avoid an excessive reduction in flow to individual outlets.
For further information contact British Gas Technical Services
Department.
Hot and cold flow – RD 532 Boilers
The flow of water demanded from both hot and cold service outlets is dependent upon the mains supply, it may not be possible
in some installations to operate all outlets simultaneously.
Water mains failure – RD 532 Boilers
If there is a failure of the mains water supply then no water will be
available at a tap or shower until the mains supply is restored. The
appliance will still operate in the central heating mode.
Use in hard water areas – RD 532 Boilers
In exceptionally hard water areas a device to prevent scale formation may be fitted. Installation of a scale inhibitor assembly should
be in accordance with the requirements of the local water company. An isolating valve should be fitted to allow for servicing.
8
6 720 610 600 GB (04.06)
General notes
Alternatively the maximum temperature of the domestic hot water
may be reset to about 45 °C which will reduce the risk of scale
formation in these hard water areas.
Ventilation
This is a room sealed appliance and does not require any air for
combustion from inside the house. If the appliance is fitted into a
cupboard or a compartment is built around the appliance after
installation then the compartment must be separated from the
boiler space by a perforated non-combustible partition as
described in BS6798.
Notwithstanding the requirements of BS6798, there is no need
for ventilation openings to be provided in the compartment
because of the low heat loss from the casing.
Do not allow the flue terminal fitted on the outside wall to become
obstructed or damaged.
Pump
The pump will have been set by the manufacturer and must not be
manually re-adjusted.
6 720 610 600 GB (04.06)
9
Controls
2
Controls
136 365
61
317 366 367 363 310 422
ECO
364
8.1
135
E
CH
C
295
170
171
172
170
173
6 720 610 600-01.1O
8.1
61
135
136
170
171
172
173
295
310
317
363
364
365
366
367
422
10
System Pressure gauge
Reset button
Master switch
Central heating temperature control
Service valves in CH flow and return
Hot water
Gas isolation valve (open)
Cold water inlet
Identification sticker
Hot water temperature control (RD 532)
Display
Indicator lamp for “burner on”
Indicator lamp for “off/on”
“Chimney sweep” button
Service button
“ECO” button
Optional timer
6 720 610 600 GB (04.06)
Operating the Appliance
3
Operating the Appliance
3.1
Preparation
Turn on the gas cock (172).
B Press in the handle and turn it anti-clockwise as far as the stop
(when handle is in line with direction of flow, the cock is open).
Central heating system valves (170)
B Using a spanner, turn square nut until groove is in line with
direction of flow (see detail).
Groove at right angles to direction of flow = off.
Cold water inlet valve (173)
B Turn handle so that it is in line with direction of flow.
When handle is at right angles to direction of flow, the valve is
closed.
170
172
173
6 720 610 577-02.1O
6 720 610 600 GB (04.06)
11
Operating the Appliance
Check the central heating system pressure
B The pointer on the pressure gauge (8.1) should be about
1 bar.
B If the pointer is below 1 bar (when the system is cold), top up
the system with water until the pointer is 1 bar. Your installer
will have shown you how to do this.
B The maximum operating pressure of 2.5 bar at maximum
central heating flow temperature must not be exceeded. If the
pressure increases to 3 bar then the relief valve (15) opens.
2
3
1
4
0
bar
8.1
CH
C
15
6 720 610 600-03.1O
12
6 720 610 600 GB (04.06)
Operating the Appliance
3.2
Switching the Appliance On/Off
Switching on
B Switch on the appliance at the master switch (I).
The indicator lamp shows green and the display will show the
central heating flow temperature, when the appliance is operating in the central heating mode.
6 720 610 333-04.1O
i
If the display alternates between -II- and the central heating flow temperature, the trap filling programme is active.
The trap filling programme ensures that the condensation trap is
filled after the appliance has been installed or after the appliance
has been out of use for a long period. For that reason, the appliance remains at minimum heating output for 15 minutes.
Switching off
B Switch off the appliance at the master switch (0).
The green indicator lamp goes out. The optional timer will continue running until the emergency supply is exhausted.
6 720 610 600 GB (04.06)
13
Operating the Appliance
3.3
Switching on the Central Heating
B Turn the central heating temperature control
level:
to the desired
– “Min” setting: 35˚C
– Low-temperature heating: setting “E” (approx. 75˚C)
– “Max” setting: 88˚C
When the burner is lit, the red indicator lamp is illuminated.
6 720 610 333-05.1O
3.4
Controlling Central Heating
B Set room thermostat to the desired room temperature.
B Set room temperature controller unit, if fitted. Refer to the
instructions with the control.
B Set the thermostatic radiator valves to the desired settings.
14
6 720 610 600 GB (04.06)
Operating the Appliance
3.5
RD 532 Boilers: Setting the Hot Water
Temperature
Hot water temperature
On RD 532 models, the hot water temperature can be set to
between approx. 40˚C and 60˚C using the temperature
control
.
The domestic hot water temperature is not shown on the display.
6 720 610 333-07.1O
Control Setting
Water Temperature
Anti-clockwise limit
approx. 40˚C
approx. 55˚C
Clockwise limit
approx. 60˚C
Table 2
“ECO” button
By pressing and holding the “ECO” button
, until the display
lights, you can switch between Comfort mode and Economy
mode.
Comfort mode: button is not lit (factory setting)
The appliance is held constantly at the set temperature. This
means that hot water is available almost instantaneously at the
tap. Consequently the appliance will switch on at intervals, even if
no hot water is being drawn.
6 720 610 600 GB (04.06)
15
Operating the Appliance
ECO mode with demand detection, button is lit
The demand detection function enables maximum gas and water
economy.
Briefly turning a hot water tap on and then off again signals
demand to the appliance which then heats up the water to the set
temperature.
Hot water is thus available in about 1 minute.
ECO mode, button is lit
Water is not heated up until hot water is drawn. This means that
there is a longer waiting period before hot water is available.
3.6
Summer Mode, Hot Water Only
(RD 532 Appliances)
With room thermostat
B Turn temperature control
on the appliance anti-clockwise
as far as the stop.
The central heating is now turned off. The hot water function
and the mains power supply for the heating programmer and
timer remain switched on.
3.7
Frost protection (RD 532 Appliances)
B Leave master switch switched on.
If the appliance is to be left for long periods switch the central
heating off:
B Add a suitable anti-freeze fluid to the water in the central heating system.
Suitable products are available from Betz-Dearborn Tel.: 0151
4209563, Fernox Tel.: 01799 550811 and Salamander on
0121 378 0952.
16
6 720 610 600 GB (04.06)
Operating the Appliance
3.8
Fault Condition
In the unlikely event of a fault occuring while the appliance is in
operation:
The display then shows a fault code and the button
flash.
If the button
may also
flashes:
B Press and hold the button
until the display shows “– –”.
The appliance will then start up again and the display will show
the central heating flow temperature.
If the button
does not flash:
B Switch the appliance off and then on again at the master
switch.
The appliance will start up again and the central heating flow
temperature will be displayed.
If the fault remains and can not be cleared:
B Call British Gas for assistance, giving a description of the fault
and, if possible, the fault code from the facia display.
6 720 610 600 GB (04.06)
17
Tips on saving energy
4
Tips on saving energy
Heating economically
The boiler is designed to provide a high level of comfort while
keeping gas consumption and the resulting environmental effect
as low as possible. The gas supply to the burner is con-trolled
according to the level of demand for heat. The boiler con-tinues to
operate with a low flame if the demand for heat reduces. The technical term for this process is modulating control. Modulating control keeps temperature fluctuations small and provides even
distribution of heat throughout the home. This means that the
boiler may stay on for relatively long periods but will use less gas
than an appliance that continually switches on and off.
Central heating systems with room thermostats/thermostatic radiator valves
The central heating control on the boiler should be set to the maximum rated temperature of the central heating system or to position “E”, when the maximum central heating water temperature
obtained is 75˚C.
The temperature can be set individually in each room (except primary room with the room thermostat) using the thermostatic radiator valves. If you wish to have a lower temperature in the primary
room than in the other rooms, leave the room thermostat at the set
temperature and turn down the radiator using the radiator valve.
Reduced-output operation
Considerable fuel savings can be made by slightly reducing the
room temperature. Lowering the temperature by 1 °C can bring
about energy savings of up to 5 %. However, it is not advisable to
allow the room temperature to fall below +15 °C. The room temperature for reduced-output mode can be set separately on the
room thermostat. Instructions are given in the control unit operating instructions.
18
6 720 610 600 GB (04.06)
General Information
Hot water
A lower setting on the hot water temperature control can result in
considerable energy savings.
For RD 532 appliances:
The on-demand activation using the ECO-button makes possible the maximum savings of gas and water.
Now you know how to heat your home economically with the RD
532/RD 428 gas condensing boiler. If you have any other questions, please contact your installer – or write to us.
5
General Information
Cleaning the Outer Case
Wipe down the outer case with a damp cloth. Do not use abrasive
or caustic cleaning agents.
Appliance details
If you ever need to call Customer Service it helps us a great deal
if you can provide precise details of your appliance.
The information is printed on the appliance identification plate/
sticker (see page 10, item 295).
Your installer will have completed the Benchmark “log-book” giving details of the boiler together with name, address and registration number. Have the “log-book” to hand when calling a Service
Engineer.
6 720 610 600 GB (04.06)
19
Maintaining your appliance
6
Maintaining your appliance
Your new RD 532/RD 428 gas-fired appliance represents a longterm investment in a reliable, high quality product.
In order to realise its maximum working life, and to ensure it continues to operate at peak efficiency and performance, it is essential that your boiler receives regular, competent servicing and
maintenance checks beyond the initial 2 year guarantee period.
To arrange for a British Gas three star cover agreement please
call 0845 9 60 50 40.
7
Service
If your RD 532/RD 428 appliance should fail to operate correctly
or requires servicing please call British Gas on:
0845 9 60 50 40.
20
6 720 610 600 GB (04.06)
Fault or breakdown
8
Fault or breakdown
This product is supported in the UK by Worcester Heat Systems
Ltd. – part of the Bosch Group.
A specialist factory trained field SERVICE ENGINEER is available
to attend a breakdown or manufacturing fault occuring on this
appliance.
No charge will be made for parts and/or labour providing:
• An appliance fault is found and the appliance has been
installed within the past 24 months. Reasonable evidence of
this must be supplied on request.
A call-out charge will be made where:
• The appliance has been installed for over 24 months.
OR
• Our Field Service Engineer finds no fault with the appliance
(see NOTE).
OR
• The cause of breakdown is misuse or with other parts of your
plumbing/heating system, or with equipment not supplied by
Worcester.
NOTE: No appliance fault is found on over 30 % of all service call
outs.
If in doubt contact our British Gas on 0845 9 60 50 40.
IN THE EVENT OF AN APPLIANCE FAULT OR BREAKDOWN please contact your Service Centre (see over). Your service administrator will arrange for an engineer to call with the
minimum of delay; under normal circumstances this will be within
the period 1-3 working days (excluding weekends) for priority
breakdown situations (no hot water and/or heating service).
INVOICES FOR ATTENDANCE AND REPAIR WORK CARRIED OUT ON THIS APPLIANCE BY ANY THIRD PARTY
WILL NOT BE ACCEPTED.
6 720 610 600 GB (04.06)
21
Your guarantee
9
Your guarantee
This appliance is guaranteed against faulty material or workmanship for a period of 24 calendar months from the date of installation subject to the following conditions and exceptions.
• That during the currency of this guarantee any components of
the unit which are proved to be faulty or defective in manufacture will be exchanged or repaired free of material charges and
free of labour charges by Worcester Heat Systems Limited.
• That the householder may be asked to prove the date of installation, that the appliance was correctly commissioned and,
where appropriate, the first 2 year service has been carried out
to the satisfaction of Worcester Heat Systems Limited when
requested.
• That any product or part thereof returned for servicing under
the guarantee any components of the unit which are proved to
be faulty guarantee must be accompanied by a claim stating
the Model, Serial Number, Date of Installation.
• That Worcester Heat Systems Limited will not accept responsibility for damage caused by faulty installation, neglect, misuse or accidental damage, the non observance of the
instructions contained in the Installation and Users Instructions
Leaflets.
• That the appliance has been used only for normal domestic
purposes for which it was designed.
• That this guarantee applies only to equipment purchased and
used in Great Britain.
This guarantee is given in addition to all your normal statutory
rights.
22
6 720 610 600 GB (04.06)
Guarantee registration
10
Guarantee registration
You should complete and return the postpaid Guarantee Registration Card within 14 days of purchase.
The card will register you as the owner of your new RD 532/
RD 428 appliance and will assist us in maintaining an effective
and efficient customer service by establishing a reference and
permanent record for your boiler.
This will not affect your statutory rights in any way.
Important:
For your own record:
Model
......................................................................................................................
Serial number:..........................................................................................
(See identity label inside appliance casing)
Type/size:...................................................................................................
Date of installation:................................................................................
Check that the Benchmark “log-book” has been completed by
your installer or service engineer.
EXCELLENCE COMES AS STANDARD
Manufactured exclusively for British Gas by The Bosch Group
Bosch Group, Worcester Heat Systems, Cotswold Way,
Warndon, Worcester WR4 9SW.
Telephone: (01905) 754624 Fax: (01905) 754619
SERIAL NUMBER. Copy the number off the Guarantee Card.
6 720 610 600 GB (04.06)
23
11
“ECO”-button lit –
Economy mode.
6 720 610 333-07.1O
Hot water temperature
Set room thermostat to desired
temperature or the outside-temperature control unit to the appropriate setting.
Controlling the central heating
6 720 610 333-11.1O
Switching off
If the
button flashes, press and
hold-in to reset the appliance.
Refer to page 17.
Fault Condition
6 720 610 333-09.1O
Hot water only
Operating Instructions Quick Reference
Switching on
6 720 610 333-04.1O
Switching the central heating
on
6 720 610 333-05.1O
“ECO”-button not lit –
Comfort mode

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