Installation & Service Instructions
This is a Wall Mounted Combination Boiler Gas Fired Central Heating Unit.
The boiler meets the requirements of Statutory Instrument “ The Boiler (Efficiency)
Regulations 1993 No 3083” and is deemed to meet the requirements of Directive
92/42/EEC on the energy efficiency requirements for new hot water boilers fired
with liquid or gaseous fuels:Type test for purpose of Regulation 5 certified by:
Notified Body 0051.
Product/Production certified by:
Notified Body 0086.
For use in GB/IE only.
These instructions include the Benchmark Commissioning Checklist and should be
left with the User for safe keeping.
Combi 24
Natural Gas
Main Combi 24 HE
G.C.No 47 474 02
Building Regulations and the Benchmark
Commissioning Checklist
Building Regulations (England & Wales) require
notification of the installation of a heating appliance to
the relevant Local Authority Building Control
Department. From 1 April 2005 this can be achieved via
a Competent Persons Self Certification Scheme as an
option to notifying the Local Authority directly. Similar
arrangements will follow for Scotland and will apply in
Northern Ireland from 1 January 2006.
CORGI operate a Self Certification Scheme for gas
heating appliances.
These arrangements represent a change from the
situation whereby compliance with Building Regulations
was accepted as being demonstrated by completion of
the Benchmark Logbook (which was then left on site
with the customer).
With the introduction of Self Certification Schemes, the
Benchmark Logbook is being withdrawn. However, a
similar document in the form of a commissioning
checklist and service interval record is incorporated at
the back of these instructions.
Baxi Potterton is a member of the Benchmark initiative
and fully supports the aims of the programme. Its aim is
to improve the standards of installation and
commissioning of central heating systems in the UK and
to encourage the regular servicing of all central heating
systems to ensure safety and efficiency.
Building Regulations require that installations should
comply with manufacturer's instructions. It is therefore
important that the commissioning checklist is completed
by the installer. The relevant section of Building
Regulations only relates to dwellings. Therefore the
checklist only applies if the appliance is being installed
in a dwelling or some related structure.
The flowchart opposite gives guidance for installers on
the process necessary to ensure compliance with
Building Regulations.
2
INSTALLER NOTIFICATION GUIDELINES
Install and Commission this
appliance to manufacturer's
instructions
Complete the
Benchmark Checklist
Choose Building
Regulations Notification
Route
Competent Person's
Self Certification Scheme
If you notify via CORGI Scheme,
CORGI will then notify the
relevant Local Authority
Building Control Scheme
on member's behalf
Building Control
Contact your relevant Local
Authority Building Control
(LABC) who will arrange
an inspection or contact
a government approved
inspector
Scheme Members only
Call CORGI on: 0870 88 88 777
or log onto:
www.corgi-notify.com
within 10 days
You must ensure that the
notification number issued by
CORGI is writen onto the
Benchmark Checklist
CORGI will record the data and
will send a certificate of
compliance to the property
LABC will record the data
and will issue a
certificate of compliance
3
LEGISLATION
IMPORTANT - Installation, Commissioning, Service & Repair
This appliance must be installed in accordance with the manufacturer’s
instructions and the regulations in force. Read the instructions fully before
installing or using the appliance.
In GB, this must be carried out by a competent person as stated in the Gas
Safety (Installation & Use) Regulations.
Definition of competence: A person who works for a CORGI registered
company and holding current certificates in the relevant ACS modules, is
deemed competent.
In IE, this must be carried out by a competent person as stated in I.S. 813
“Domestic Gas Installations”.
Lifting - This product should be lifted and handled by two people. Stooping
should be avoided and protective equipment worn where necessary. Carrying
& lifting equipment should be used as required, e.g. when installing in in a loft
space.
Baxi Potterton declare that no substances harmful
to health are contained in the appliance or used
during appliance manufacture.
The appliance is suitable only for installation in GB
and IE and should be installed in accordance with
the rules in force, and only used in a suitably
ventilated location.
In GB, the installation must be carried out by a CORGI
Registered Installer. It must be carried out in accordance
with the relevant requirements of the:
• Gas Safety (Installation & Use) Regulations.
• The appropriate Building Regulations either The
Building Regulations, The Building Regulations
(Scotland), Building Regulations (Northern Ireland).
• The Water Fittings Regulations or Water Byelaws in
Scotland.
• The Current I.E.E. Wiring Regulations.
Where no specific instructions are given, reference
should be made to the relevant British Standard Code of
Practice.
The addition of anything that may interfere with the normal operation of the
appliance without express written permission from the manufacturer or his
agent could invalidate the appliance warranty. In GB this could also infringe
the Gas Safety (Installation and Use) Regulations.
In IE, the installation must be carried out by a competent
Person and installed in accordance with the current
edition of I.S. 813 ‘Domestic Gas Installations’, the
current Building Regulations and reference should be
made to the current ETCI rules for electrical installation.
Warning - Check the information on the data plate is compatible with local
supply conditions.
All systems must be thoroughly flushed and
treated with inhibitor (see section 6.1).
Codes of Practice, most recent version should
be used
All CORGI registered installers carry a CORGI identification card and have a
registration number. You can check your installer is registered by telephoning
0870 4012300 or writing to:1 Elmwood,
Chineham Business Park,
Crockford Lane,
Basingstoke. RG24 8WG
or check online at www.corgi-gas-safety.com
4
In GB the following Codes of Practice apply:
Standard
Scope
BS 6891
Gas Installation.
BS 5546
Installation of hot water supplies for
domestic purposes.
BS 5449
Forced circulation hot water systems.
BS 6798
Installation of gas fired hot water boilers.
BS 5440 Part 1
Flues.
BS 5440 Part 2
Ventilation.
BS 7074
Expansion vessels and ancillary equipment
for sealed water systems.
BS 7593
Treatment of water in domestic hot water
central heating systems.
In IE the following Codes of Practice apply:
Standard
Scope
I.S. 813
Domestic Gas Installations.
The following BS standards give valuable additional information;
BS 5546
Installation of hot water supplies for
domestic purposes.
BS 5449
Forced circulation hot water systems.
BS 7074
Expansion vessels and ancillary equipment
for sealed water systems.
BS 7593
Treatment of water in domestic hot water
central heating systems.
CONTENTS
Section
Page
1.0
Introduction
6
2.0
General Layout
7
3.0
Appliance Operation
8
4.0
Technical Data
9
5.0
Dimensions and Fixings
10
6.0
System Details
11
7.0
Site Requirements
14
8.0
Installation
19
9.0
Commissioning
24
10.0 Completion
26
11.0 Servicing
27
12.0 Changing Components
29
13.0 Electrical
38
14.0 Fault Finding
39
15.0 Short Parts List
44
Benchmark Checklist
46
5
1.0
1.1
INTRODUCTION
Description
1. The Main Combi 24 is a fully automatic gas fired
wall mounted combination boiler. It is room sealed and
fan assisted, and will provide central heating and
mains fed domestic hot water.
Case Front Panel
2. The boiler is set to give a maximum output of
24.0 kW.
3. It is designed for use on Natural Gas (G20) and can
be converted to use Propane or Butane.
4. The boiler is suitable for use only on fully pumped
sealed heating systems. Priority is given to domestic
hot water.
5. The boiler data badge gives details of the model,
serial number and Gas Council number and is situated
on the control box. It is visible when the case front
panel is removed (Fig. 1).
6. The boiler is intended to be installed in residential /
commercial / light industrial E.M.C. environments on a
governed meter supply only.
Control Box
7. The boiler must be installed with one of the purpose
designed flues such as the standard horizontal flue kit,
part no. 247719.
Fig. 1
8. All systems must be thoroughly flushed and treated
with inhibitor (see section 6.2).
Data Badge
1.2
Optional Extras
1. Various flue extensions, bends, vertical flue kits,
control accessories etc. are available as optional
extras. These are detailed in a separate publication.
6
2.1
GENERAL LAYOUT
Layout
1.
Air Pressure Switch
2.
Expansion Vessel
3.
Burner Manifold
4.
Automatic Air Vent
5.
DHW Plate Heat Exchanger
6.
Circulation Pump
7.
Drain Off Point
8.
Pressure Relief Valve
9.
Optional Integral Timer Position
10.
Central Heating System Pressure Gauge
11.
Control PCB
12.
Control Box
13.
3-Way Valve Assembly
15
14.
Flame Sensing Electrode
14
15.
Spark Electrode
16.
Burner
17.
Primary Heat Exchanger
18
17
1
16
2
3
4
13
18.
Fan Assembly
19.
On / Off / Reset Selector Switch
20.
Burner Neon
21.
Power Neon
22.
Reset Neon
23.
Central Heating Temperature Control
24.
Hot Water Temperature Control
5
6
7
8
12
11
Fig. 2
10
9
2
Reset
Burner On
1
3
Flame Failure
Power On
4
2.0
0
bar
Fig. 3
19
20
21
22
23
24
10
9
7
3.0
NOTE: All delay timers mentioned in 3.1 and 3.2
are overridden by domestic hot water demand.
1
Central Heating Circuit
3.1
2
3 4
7
26
5
APPLIANCE OPERATION
6
Central Heating Mode (Fig. 4)
1. With a demand for heating, the pump circulates
water through the primary circuit. At a pre-determined
flow rate the central heating flow switch operates,
initiating the ignition sequence.
2. The main burner ignites at low rate, then the gas
valve controls the gas rate to maintain the heating
temperature measured by the temperature sensor.
25
24
8
23
9
22
21
11
17
10
3. When the flow temperature exceeds the setting
temperature, a 3 minute delay occurs before the
burner relights automatically (anti-cycling). The pump
continues to run during this period.
20
Fig. 4
18
16
19
15
14
13
3.2
12
1. Priority is given to the domestic hot water supply. A
demand at a tap or shower will override any central
heating requirement.
Key
1
2
3
4
5
6
7
8
9
10
11
12
13
Primary Heat Exchanger
Burner
Ignition Electrode
Flame Sensing Electrode
Gas Valve
Pump
Automatic Air Vent
Plate Heat Exchanger
Flow Sensor with Filter
Pressure Relief Valve
Boiler Drain Point
Heating Return
Cold Water Inlet On/Off Valve and Filter
14
15
16
17
18
19
20
21
22
23
24
25
26
Gas Inlet
Domestic Hot Water Outlet
Heating Flow
Pressure Gauge
Hydraulic Differential Pressure Sensor Microswitch
Automatic By-Pass
Hydraulic Differential Pressure Sensor
Diverter Valve Assembly
Domestic Hot Water Flow Priority Assembly
Domestic Hot Water Flow Priority Microswitch
Temperature Sensor
Overheat Thermostat
Expansion Vessel
Domestic Hot Water Circuit
2
3 4
7
26
5
6
25
24
8
23
9
22
21
11
17
10
20
8
16
18
19
15
14
13
2. The flow of water will operate the DHW flow switch
which causes the 3 way valve to change position. This
will allow the pump to circulate the primary water
through the DHW plate heat exchanger.
3. The burner will light automatically and the
temperature of the domestic hot water is controlled by
the temperature sensor.
4. When the domestic hot water demand ceases the
burner will extinguish and the diverter valve will
remain in the domestic hot water mode, unless there
is a demand for central heating.
1
Fig. 5
Domestic Hot Water Mode (Fig. 5)
12
IMPORTANT: When the selector switch is in the
‘0’ (Off) position the electrical supply to the boiler
is isolated. The boiler will not operate and the
integral timer (if fitted) will require resetting once
the selector switch is turned to either the DHW
or CH position.
4.0
TECHNICAL DATA
Appliance Type
C12
Appliance Category
C32
CAT
2H 3+
Max
Min
kW
26.3
10.6
Btu/h
89,739
36,167
Max
Min
kW
24.0
9.3
Btu/h
81,891
31,732
Heat Input C/H & DHW
Heat Output
Max Gas Rate (Natural Gas - G20)
(After 10 Mins)
m3/h
2.78
ft3/h
98.12
Burner Pressure (Natural Gas - G20)
Max Rate
Min Rate
mbar
12.2 ± 0.5
2.5 ± 0.2
in wg
4.88 ± 0.2
1.0 ± 0.2
Inlet Pressure (Natural Gas - G20)
mbar
20
in wg
8
Burner Injector (Natural Gas - G20)
12 x 1.28mm Diameter
Electrical Supply
230V~ 50Hz
(Appliance must be connected to an
earthed supply)
Power Consumption
170W
External Fuse Rating
3A
NOx Class
3
Flue Terminal
Dimensions
Diameter
Projection
Connections
Gas Supply
Central Heating Flow
Central Heating Return
Cold Water Mains Inlet
DHW Flow
Pressure Relief Discharge
Outercase Dimensions
Casing Height
Overall Height Inc Flue
Elbow
Casing Width
Casing Depth
Clearances
Both Sides
Above Casing
Below Casing
Front
Front
-
100mm
95mm
780mm
-
980mm
450mm
345mm
8
0.2
0.9
Flow Rates
DHW Flow Rate
@ 30o C Rise
l/min
11.4
DHW Flow Rate
@ 35o C Rise
9.8
Min Working
DHW Flow Rate
2.5
Pump Grundfos 15-50
Available Head
See graph below
Expansion Vessel - (For Central Heating
only. Integral with appliance)
bar
Pre-charge Pressure
0.5
5 mm Min
200 mm Min
200 mm Min
450 mm Min (For Servicing)
5 mm Min (In Operation)
Weights
Packaged Boiler Carton
Packaged Flue Kit
Installation Lift Weight
bar
Min Operating Pressure
at 9.8 l/min
copper tails
22mm
22mm
22mm
15mm
15mm
15mm
-
litre
Max Capacity of
CH System
Primary Water Content
of Boiler (unpressurised)
kg
46
3
38.5
125
1.0
Temperatures
C.H. Flow Temp (adjustable)
35°C to 85°C max (± 5°C)
Central Heating Primary Circuit
Pressures
D.H.W. Flow Temp (adjustable)
35°C to 65°C max (± 5°C)
dependent upon flow rate
bar
3
2.5
0.5
1-2
Safety Discharge
Max Operating
Min Operating
Recommend Operating
Internal Fuse Rating
Fuse 2A Fast Blow to BS 4265
DHW Circuit
Pressures
Max Operating
Min Operating
Electrical Protection
IPX4D
Pump - Available Head
5.5
5
4.5
4
3.5
3
LPG Gases - Propane G31 Butane G31
Burner Pressure Max Rate
Propane
mbar 36.2
in wg 14.5
Butane
mbar 28.3
in wg 11.3
Inlet Pressures
mbar
in wg
Butane
30
12
Min Rate
6.4
2.6
5.3
2.1
Propane
37
14.8
Metre wg
2.5
Burner Injector 12 x 0.77mm diameter
2
1.5
1
0.5
0
l/h
0
200
400
600
800
1000
1200
9
5.0
G
DIMENSIONS AND FIXINGS
E
Dimensions
A
A 780mm
B 345mm
C 450mm
B
D 107mm Ø Min.
E 200mm
360° Orientation
F 190mm
D
G 143mm
C
Tube Ø 100mm
Fig. 6
F
Gas Inlet
Heating
Flow
95mm
Domestic Hot
Water Outlet
65mm
Cold Water
Inlet
65mm
65mm
Heating
Return
65mm
165.7mm
View from under the appliance
Left Hand Side
of Boiler
130mm
Wall
Fig. 7
10
6.0
6.1
SYSTEM DETAILS
Information
1. The Main Combi 24 Combination Boiler is a ‘Water
Byelaws Scheme - Approved Product’.
To comply with the Water Byelaws your attention is
drawn to the following installation requirements and notes
(IRN).
a) IRN 001 -
See text of entry for installation
requirements and notes.
b) IRN 302 - Byelaw 14.
2. Reference to the WRc publications, ‘Water fittings and
materials directory’ and ‘Water supply byelaws guide’ give
full details of byelaws and the IRNs.
6.2
Central Heating Circuit
1. The appliance is suitable for fully pumped SEALED
SYSTEMS ONLY.
Treatment of Water Circulating Systems
• All recirculatory water systems will be subject to
corrosion unless an appropriate water treatment is
applied. This means that the efficiency of the system will
deteriorate as corrosion sludge accumulates within the
system, risking damage to pump and valves, boiler noise
and circulation problems.
• When upgrading existing systems that exhibit evidence
of sludging, it is advisable to clean the system prior to
treatment in order to remove any sludge and reduce the
likelihood of these deposits damaging new components.
• When fitting new systems flux will be evident within
the system, which can lead to damage of system
components.
• All systems must be thoroughly drained and flushed
out. The recommended flushing and cleansing agents
are Betz-Dearborn Sentinel X300 or X400 and Fernox
Superfloc Universal Cleanser which should be used
following the flushing agent manufacturer’s instructions.
• System additives - corrosion inhibitors and flushing
agents/descalers should be suitable for aluminium and
comply to BS7593 requirements. The only system
additives recommended are Betz-Dearborn Sentinel
X100 and Fernox-Copal which should be used following
the inhibitor manufacturer’s instructions.
Failure to flush and add inhibitor to the system
may invalidate the appliance warranty.
• It is important to check the inhibitor concentration
after installation, system modification and at every
service in accordance with the manufacturer’s
instructions. (Test kits are available from inhibitor
stockists.)
• For information or advice regarding any of the above
contact Technical Enquiries.
6.3
Bypass
1. The boiler is fitted with an automatic integral bypass.
6.4
System Control
1. The boiler is designed for use in a heating system that
incorporates external controls, i.e. a minimum of a timer
device.
2. An integral electro-mechanical or electronic timer is
available as an optional extra.
3. For optimum operating conditions and maximum
economy the fitting of a programmable thermostat is
recommended.
11
6.0
SYSTEM DETAILS
6.5
System Filling and Pressurising
1. A filling point connection on the central heating return
pipework must be provided to facilitate initial filling and
pressurising and also any subsequent water loss
replacement/refilling.
Stop
Valve
DHW
Mains
Inlet
Double
Check
Valve
Temporary
Hose
Fig. 8
2. There are connection points on the mains cold water
inlet and central heating return isolating taps to which
the optional filling loop kit (Part No. 248221) can be
assembled.
Stop
Valve
CH
Return
3. The filling method adopted must be in accordance
with all relevant water supply regulations and use
approved equipment.
4. Your attention is drawn to: for GB: guidance G24.2
and recommendation R24.2 of the Water Regulations
Guide.
for IE: the current edition of I.S. 813 “Domestic Gas
Installations”.
5. The sealed primary circuits may be filled or
replenished by means of a temporary connection
between the primary circuit and a supply pipe provided
the arrangement in accordance with Diagram R24.2a of
the Water Regulations Guide.
6. The temporary hose must be completely removed at
both ends after use.
6.6
Expansion Vessel (Central Heating only)
1. The appliance expansion vessel is pre-charged to
0.5 bar. Therefore, the minimum cold fill pressure is 0.5
bar. The vessel is suitable for correct operation for
system capacities up to 125 litres. For greater system
capacities an additional expansion vessel must be
fitted. For GB refer to BS 7074 Pt 1. For IE, the current
edition of I.S. 813 “Domestic Gas Installations”.
Pressure Relief Valve
6.7
Pressure Relief Valve (Fig. 9)
1. The pressure relief valve is set at 3 bar, therefore all
pipework, fittings, etc. should be suitable for pressures
in excess of 3 bar.
Fig. 9
Discharge Pipe
2. The pressure relief discharge pipe should be not less
than 15mm dia, run continuously downward, and
discharge outside the building, preferably over a drain.
It should be routed in such a manner that no hazard
occurs or causes damage to wiring or electrical
components. The end of the pipe should terminate
facing down and towards the wall.
3. The discharge must not be above a window,
entrance or other public access. Consideration must be
given to the possibility that boiling water/steam could
discharge from the pipe.
12
6.0
SYSTEM DETAILS
6.8
Domestic Hot Water Circuit
1. All DHW circuits, connections, fittings, etc. should
be fully in accordance with relevant standards, the
Water Supply (water fittings) Regulations and the
Water Bylaws (Scotland).
2. Your attention is drawn to:
for GB: Guidance G17 to G24 and recommendation
R17 to R24 of the Water Regulations Guide.
for IE: the current edition of I.S. 813 “Domestic Gas
Installations”.
3. A single check valve must be fitted as shown in
Fig. 11 to prevent backflow to the supply pipe and to
ensure the efficient operation of the expansion vessel
which is required to accommodate the thermal
expansion of the water.
4. When the domestic water system includes any
device which prevents water expanding back towards
the supply (check valve, loose jumpered stopcock,
water meter, water treatment device) then an
expansion vessel must be fitted (eg. Zilmet 160ml,
R1/2 15bar).
Other Tap
Outlets
Expansion
Vessel
Boiler
Check
Valve
Pressure
Reducing Valve
To Hot
Taps
Stop Tap
Fig. 11
5. If the hot water expansion is not provided for, then
high pressures can develop which may result in
damage to fittings and devices on the system.
6. The boiler’s maximum working mains pressure is 8
bar, therefore all pipework, connections, fittings, etc.
should be suitable for pressures in excess of 8 bar. A
pressure reducing valve must be fitted for pressures
in excess of 8 bar. The manufacturer of any outlet
fittings, such as a shower valve, may require a lower
maximum pressure. The pressure reduction must
take account of all fittings connected to the DHW
system.
6.9
Showers
1. If a shower control is supplied from the appliance it
should be of the thermostatic or pressure balanced
type. Thermostatic type shower valves provide the
best comfort and guard against water at too high a
temperature. Existing controls may not be suitable refer to the shower valve manufacturer.
6.10
Hard Water Areas
1. If the area of the installation is recognised as a
HARD WATER AREA then a suitable device should
be fitted to treat the mains water supply to the boiler.
Contact your Water Distribution Company for advice
on suitable devices.
13
450mm
5mm Min
7.0
SITE REQUIREMENTS
7.1
Location
5mm Min
200mm Min
1. The boiler may be fitted to any suitable wall with the
flue passing through an outside wall or roof and
discharging to atmosphere in a position permitting
satisfactory removal of combustion products and
providing an adequate air supply. The boiler should be
fitted within the building unless otherwise protected by
a suitable enclosure i.e. garage or outhouse. (The
boiler may be fitted inside a cupboard-see Section 7.3).
2. If the boiler is sited in an unheated enclosure then it
is recommended to leave the On/Off/Reset Selector
Switch in the On Position.
780mm
4. If the boiler is to be fitted into a building of timber
frame construction then reference must be made to the
current edition of Institute of Gas Engineers Publication
IGE/UP/7 (Gas Installations in Timber Framed
Housing).
2
Burner On
3
1
Reset
Flame Failure
4
0
Power On
3. If the boiler is fitted in a room containing a bath or
shower reference must be made to the relevant
requirements.
In GB this is the current I.E.E. Wiring Regulations and
Building Regulations.
In IE reference should be made to the current edition of
I.S. 813 “Domestic Gas Installations” and the current
ETCI rules.
bar
200mm Min
Fig. 12
7.2
Clearances (Fig. 12 & 13)
1. A flat vertical area is required for the installation of
the boiler.
2. These dimensions include the necessary clearances
around the boiler for case removal, spanner access
and air movement. Additional clearances may be
required for the passage of pipes around local
obstructions such as joists running parallel to the front
face of the boiler.
450mm Min
For Servicing
Purposes
5mm Min
In Operation
Fig. 13
14
7.0
7.3
SITE REQUIREMENTS
Ventilation of Compartments
1. Where the appliance is installed in a cupboard or
compartment, no air vents are required. The
appliance will run sufficiently cool without ventilation.
2. Minimum clearances must be maintained and the
compartment should be large enough to house the
boiler and any ancillary equipment only.
7.4
Gas Supply
1. The gas installation should be in accordance with
the relevant standards. In GB this is BS 6891. In IE
this is the current edition of I.S. 813 “Domestic Gas
Installations”.
2. The connection to the appliance is a 22mm copper
tail located at the rear of the gas service cock
(Fig. 14).
3. Ensure that the pipework from the meter to the
appliance is of adequate size. Do not use pipes of a
smaller diameter than the boiler gas connection
(22mm).
7.5
Electrical Supply
1. External wiring must be correctly earthed, polarised
and in accordance with relevant regulations/rules. In
GB this is the current I.E.E. Wiring Regulations. In IE
reference should be made to the current edition of
ETCI rules.
Fig. 14
Gas Service Cock
2. The mains supply is 230V ~ 50Hz fused at 3A
maximum.
NOTE: The method of connection to the electricity
supply must facilitate complete electrical isolation
of the appliance.
Connection may be via a fused double-pole
isolator with a contact separation of at least 3mm
in all poles and servicing the boiler and system
controls only.
15
7.0
7.6
SYSTEM REQUIREMENTS
Flue
1. the following guidelines indicate the general
requirements for siting balanced flue terminals. For
GB recommendations are given in BS 5440 Pt 1. For
IE recommendations are given in the current edition of
I.S. 813 “Domestic Gas Installations”.
2. If the terminal discharges onto a pathway or
passageway, check that combustion products will not
cause a nuisance and that the terminal will not
obstruct the passageway.
3. If a terminal is less than 2 metres above a balcony,
above ground or above a flat roof to which people
have access, then a suitable terminal guard must be
provided.
L
K
B,C
N
G
G
D
M
J
A
A
E
F
D
H,I
F
G
Fig. 16
Likely flue positions requiring
a flue terminal guard
Terminal Position with Minimum Distance (Fig. 16)
(mm)
A* Directly below an openable window, air vent or any other
ventilation opening.
300
B Below gutters, drain/soil pipe.
25
C Below eaves.
25
D Below balcony/car port roof.
25
E From vertical drain pipes and soil pipes.
25
F From internal or external corners.
25
G Above adjacent ground or balcony level.
300
H From a surface or boundary facing the terminal.
600
I Facing terminals.
1200
J For opening (door/window) in car port into dwelling.
1200
K Vertically from a terminal on the same wall.
1500
L Horizontally from a terminal on the same wall.
300
M* Above an opening, air brick, opening window etc.
300
N* Horizontally to an opening, air brick, opening window etc. 300
* In addition, the terminal should be no nearer than 150mm to an
opening in the building fabric formed for the purpose of
accommodating a built-in element such as a window frame. See
BS 5440 Pt. 1.
16
Terminal
Assembly
300 min
Top View Rear Flue
Property Boundary Line
7.0
7.7
SITE REQUIREMENTS
Flue Dimensions
The standard horizontal flue kit allows for flue lengths
between 100mm and 1metre from elbow to terminal
(Fig. 17).
1m
m
0m
10
The maximum permissible flue length is:
5 metres.
7.8
Flue Terminal Trim
1. Once the flue is secure the trim can be fitted if
required.
Fig. 17
2. Remove the protective backing from the adhesive
seal. Apply the seal to the rear of the trim flange
(Fig. 18).
3. Locate the trim over the flue terminal and push it
back to the wall to compress the seal (Fig. 19).
Flue Trim
7.9
Terminal Guard (Fig. 20)
Fig. 18
1. When codes of practice dictate the use of terminal
guards, they can be obtained from most Plumbers’
and Builders’ Merchants.
2. There must be a clearance of at least 50mm
between any part of the terminal and the guard.
Fig. 19
Adhesive Seal
3. When ordering a terminal guard, quote the
appliance name and model number.
4. The flue terminal guard should be positioned
centrally over the terminal and fixed as illustrated.
Fig. 20
17
7.0
SITE REQUIREMENTS
7.10
Flue Options
1. The Main Combi 24 can be fitted with flue systems
as illustrated.
2. The standard flue is suitable only for horizontal
applications.
3. Maximum permissible equivalent flue lengths are:Horizontal
5 metres
Vertical
4 metres
Vertical (Twin Pipe)
15 metres
Maximum Length = 4m inc. 2 x 45° bends
Horizontal
Flues
4. Any additional “in line” bends in the flue system
must be taken into consideration.
Their equivalent lengths are:Concentric Pipes:
45° bend
0.5 metres
90° bend
1.0 metres
Twin Flue Pipe
45° bend
0.25 metres
90° bend
0.50 metres
The elbow supplied with the standard horizontal flue
is not included in any equivalent length calculations
5. The illustrations opposite show examples of
maximum equivalent lengths.
6. Instructions for guidance and fitting are included in
each kit, where appropriate.
Vertical
Flues
(Twin Pipe)
Maximum Length = 14m
inc. 4 x 45° bends
Vertical
Flues
Maximum Length = 2m
inc. 2 x 90° bends
18
8.0
INSTALLATION
8.1
Initial Preparation
Fixing Template
The gas supply, gas type and pressure must be
checked for suitability before connection (see
Section 7.4).
1. After considering the site requirements
(see Section 7.0) position the fixing template on the
wall ensuring it is level both horizontally and vertically.
922.034.1
107mm Dia Minimum
Aperture For Flue Tube
Horizontal Side Flue
Centre Line
107mm diameter minimum
aperture for flue tube
200 mm
Minimum
Clearance
Vertical Flue
Centre Line
Appliance Wall Plate
2. Mark the position of the two most suitable fixing
slots for the wall plate and boiler lower fixing holes. It
is preferable to use the horizontal fixing slots. For side
flue exit, mark as shown.
Boiler Mounting Bracket Fixing Slots
Drill 8 mm diameter x 50 mm deep
190mm
3. Mark the position of the centre of the flue hole (rear
exit). For side flue exit, mark as shown.
4. If required, mark the position of the gas and water
pipes. Remove the template.
For Side Flue Exit
FIXING TEMPLATE
5. Cut the hole for the flue (minimum diameter
107mm).
6. Drill the wall as previously marked to accept the
wall plugs supplied. Secure the wall plate using two of
the fixing screws.
5 mm Minimum
Side Clearance
Appliance Outline
General area for
electrical supply
5 mm Minimum
Side Clearance
Profile of
Outercase
7. Using a spirit level ensure that the plate is level
before finally tightening the screws.
Boiler Lower Fixing Holes
Drill 8 mm diameter x 50 mm deep
General
Area For
Electrical
Supply
Central Heating Flow
8.2
Flushing
Domestic Hot Water Outlet
95 mm
1. Connect a tube to the central heating flow or return
pipe (Fig. 22).
Gas Supply
65 mm
Hot Water
Outlet
(15mm)
65 mm
Gas
Inlet
(22mm)
Cold Water
Inlet
(15mm)
65 mm
65 mm
Heating
Return
(22mm)
Pressure Relief
Valve
(15mm)
200 mm
Minimum
Clearance
Cold Water Inlet
Central Heating Return
2. Flush thoroughly (see System Details, Section 6.2).
65 mm
Heating
Flow
(22mm)
Comp No 249074 - Iss 1 - 3/01
Pressure Relief
Fig. 21
8.3
Preparing The Boiler
1. Remove all packaging.
2. Stand the boiler on its base by using the rear lower
edge as a pivot.
Flushing Tube
NOTE: A small amount of water may drain from the
boiler in the upright position.
Central Heating Return
Fig. 22
19
8.0
8.4
INSTALLATION
Fitting The Boiler
Wall Plate
1. Lift the boiler using the lower edges. Engage the
slots at the top rear of the boiler on the wall plate
hooks (Fig. 23).
2. Ensure that the boiler is level and sits against the
wall.
3. Take the two steel washers and remaining screws.
Using the previously drilled and plugged holes, secure
the bottom of the boiler to the wall (Fig. 24).
Fig. 23
4. Remove the elbows, valves and sealing washers
from the packaging. The 3/4 in valve with internal filter
must be fitted to the central heating return. The filter is
visible through the branch connection of the valve.
5. Using the sealing washers provided connect the
valves to the heating flow and return, and the cold
water inlet.
6. Connect the elbows to the gas service cock and hot
water outlet pipe, and then connect the elbows to the
boiler. Connect the elbows with flared ends to the
valves.
Securing Screw
Washer
7. Ensure that the sealing washers are used on all
connections. The rubber washers must be used on the
gas connections.
8. The gas and water supplies, central heating flow
and return and domestic hot water flow can now be
connected.
Fig. 24
8.5
Fitting the Pressure Relief
Discharge Pipe (Fig. 25)
Pressure Relief Valve
1. Remove the discharge pipe from the kit.
2. Determine the routing of the discharge pipe in the
vicinity of the boiler. Make up as much of the pipework
as is practical, including the discharge pipe supplied.
Fig. 25
Discharge Pipe
3. The pipework must be at least 15mm diameter and
run continuously downwards to a discharge point
outside the building. See section 6.7 for further details.
4. Using one of the sealing washers, connect the
discharge pipe to the adaptor and tighten the nut.
5. Complete the discharge pipework and route it to the
outside discharge point.
IMPORTANT: Make all soldered joints before
connecting to the pressure relief valve.
20
8.0
8.6
INSTALLATION
Fitting The Flue
HORIZONTAL FLUE
Wall Thickness
1. The standard flue is suitable for lengths 100mm
minimum to 1m maximum (measured from the edge
of the flue elbow outlet).
(X)
Rear Flue: maximum wall thickness - 900mm
Side Flue: maximum wall thickness - 870mm
2. Locate the flue elbow on the adaptor at the top of
the boiler. Set the elbow to the required orientation
(rear, right or left).
3. Measure the distance from the outside wall face to
the elbow (Fig. 27). This dimension will be known as
‘X’.
4. Taking the air duct, mark dimension ‘X’ as shown
(Fig. 28). Measure the length of waste material, and
transfer the dimension to the flue duct (Fig. 28).
IMPORTANT: Check all measurements before
cutting the ducts.
5. Remove the waste from both ducts. Ensure that
the cut ends are square and free from burrs.
6. Remove the flue elbow from the adaptor.
(X)
7. Insert the flue duct into the air duct and pass them
through the hole in the wall.
Wall Thickness
Fig. 27
(X)
Waste
Air Duct
Waste
Fig. 28
Flue Duct
21
8.0
INSTALLATION
8.6
Fitting the Flue (Cont)
IMPORTANT: If the flue length is greater than 1.5m
the restrictor MUST be removed from the adaptor
(Fig. 29).
Elbow
8. Take one of the rubber seals and position it on the
boiler flue adaptor. Engage the flue elbow on the
adaptor and pull the sleeve up so that it equally covers
the joint (Fig. 29).
Seal
Restrictor
Adaptor
9. Remove the screws from one of the clips provided.
Prise the clip apart and fit it over the seal. Set the
elbow to the required angle (Fig. 30).
Fig. 29
10. Refit the screws to the clip and tighten them to
secure the elbow. Take the second rubber seal and
position it on the flue elbow.
11. Locate the flue duct clamp on the flue outlet elbow.
Draw the flue duct out of the air duct, engage it in the
clamp and tighten the screws (Fig. 31).
Seal
Clip
12. Draw the air duct out of the wall and align it with
the elbow. Position the seal so that it equally covers
the joint (Fig. 32).
Screws
13. Remove the screws from the second clip provided.
Prise the clip apart and fit it over the seal. Refit the
screws to the clip and tighten them (Fig. 32).
14. Where possible position the clips so that the
screws are not visible.
Fig. 30
15. Make good between the wall and air duct outside
the building.
16. Fit the circular flue trim outside if required, and if
necessary fit a terminal guard (see Section 7.8 & 7.9).
Flue Duct
Flue Duct
Clamp
8.7
Extensions & Additional Elbows
1. The method of connecting any flue extensions or
additional elbows is the same as that for connecting
the standard flue and 90° elbow as described above.
2. If, for example, when a flue extension is connected
to a 90° elbow the flue duct will project from the air
duct at the unconnected end by the same amount as
the flue duct spigot does from the elbow . Further
elbows or extensions can then be added to this.
Fig. 31
Clip
Screws
3. Similarly, a concentric flue can be connected to the
boiler adaptor in the same manner as it does to the
elbow to provide a vertical flue.
4. The additional 90° elbow available is identical to the
elbow supplied with the standard flue. 45° elbows are
of the same principle.
Air Duct
Seal
Fig. 32
22
5. Extensions can be cut according to the requirements
of the installation.
8.0
8.8
INSTALLATION
Making The Electrical Connections
To connect the mains input cable proceed as
follows:-
Fig. 33
1. Slacken the facia panel securing screws and lift
the outercase panel so that its securing tabs are clear
of the facia. Remove the panel.
2. Undo the screws securing the facia panel and
hinge it down (Fig. 35).
Control Box Cover
3. Remove the control box cover securing screws.
Disengage the barbs on the control box from the
cover. Remove the cover (Fig. 33).
4. Slacken the cable clamp on the LH side of the
boiler chassis (Fig. 34). Insert the cable through the
clamp and route it to the terminal block.
5. Slacken the screws in the terminal block, connect
the input cable, and tighten the screws.
6. If an external control is to be connected it can be
done at this point. Run the input cable from the
external control through the second cable clamp on
the boiler chassis. Refer to the instructions supplied
with the control.
7. To connect external control(s) remove the link
between terminals 1 & 2. The 230V supply at
terminal 1 can be connected to the external
control as shown. The switched output from the
external control must be connected to terminal 2.
(Figs. 36 & 37).
Fig. 35
Fig. 34
Facia Panel
Cable Clamp
Frost Thermostat
L
N
Fuse
230 V
1
bk
2
bk
N
Live (brown)
Neutral (blue)
br
b
Earth (green/yellow)
g/y
SL
Room Thermostat
1
bk
2
bk
Terminal Block
Fig. 36
IMPORTANT: The external control MUST be
suitable for 230V switching.
IMPORTANT: If an integral timer is fitted to the
boiler an external frost thermostat wired as
shown will not operate correctly. Only external
timers may be used in such installations, as in
the diagram.
Fig. 37
Functional Flow Diagram
External
Controls
Pump
L
230 V
br
b
N
br
b
br
Pressure Switch
Fan
9. If an optional integral timer is to be used it should
be fitted at this point. Refer to the instructions
supplied with the timer. NOTE: An external frost
thermostat cannot be used with the integral timer.
br
b
Selector /
Reset Switch
br
bk
b
Safety Overheat Thermostat
b
b
r
b
br
bk
PCB
Preliminary Electrical Checks
Fig. 38
Key to Wiring
b - blue
br - brown
bk - black
r - red
g - green
w - white
NTC Sensor
r
bk
1. Prior to commissioning the boiler preliminary
electrical system checks should be carried out.
N
b
r
2. These should be performed using a suitable meter,
and include checks for Ground Continuity,
Resistance to Ground, Short Circuit and Polarity.
b
g/y
Always fit fast
blow 2A fuse
NOTE: If the room thermostat being used
incorporates an anticipator it MUST be wired as
shown in Fig. 37.
8.9
br
External Clock
Fused supply 3A
230V ~ 50Hz
230V
8. Ensure that both mains input and, where fitted,
external control input cables have sufficient slack to
allow the control box to drop down. Tighten the cable
clamp(s) on the boiler chassis.
L
N
Spark Electrode
Gas Valve
bk
bk
Gas Valve Modulator
Flame Sensing Electrode
r
Hydraulic Differential Pressure Switch
r
br
bk
3-way Valve Microswitch
b
N
23
9.0
COMMISSIONING
9.1
Commissioning the Boiler
1. Reference should be made to BS 5449 Section 5
when commissioning the boiler.
2. Open the mains water supply to the boiler.
3. Open all hot water taps to purge the DHW system.
4. Ensure that the filling loop is connected and open,
then open the heating flow and return valves on the
boiler.
5. Open the screw on the automatic air vent (Fig. 40).
6. The system must be flushed in accordance with BS
7593 (see Section 6.2) and the flushing agent
manufacturers instructions.
7. Pressurise the system to at least 0.5 bar then close
and disconnect the filling loop (Fig. 39).
Screw
Fig. 40
Pressure Gauge
8. Turn the gas supply on and purge the system
according to in GB BS 6891 and in IE I.S. 813
“Domestic Gas Installations”.
2
1
3
9. Test for gas soundness.
4
0
bar
Selector Switch
Fig. 39
Automatic Air Vent
2
Burner On
3
1
Reset
Flame Failure
4
0
Power On
bar
Fig. 41
Central Heating
Temperature Control
24
Hot Water
Temperature Control
10. If at any time during commissioning it is required to
terminate a particular cycle, turn the selector to the
OFF position and then back to either ( ) or (
)
(Fig. 41).
9.0
COMMISSIONING
9.2
Checking the Burner Pressure
Selector Switch
1. Turn on the gas and electrical supplies to the boiler
and ensure that all external controls are calling for
heat.
2. Set the temperature controls to maximum and the
selector switch to the Off position (Fig. 42).
2
Reset
Burner On
1
3
Flame Failure
4
0
Power On
bar
3. Slacken the pressure test point sealing screw on
the gas valve and connect a pressure gauge (Fig. 43).
Fig. 42
Central Heating
Temperature Control
4. Undo the screws securing the inner door panel. Lift
the panel slightly to disengage it from the studs on top
of the case.
5. IMPORTANT: Turn the selector switch fully
anticlockwise against the spring pressure to the
reset position and hold for at least 3 seconds to
reset the boiler.
OUT
Pressure Test Point
Sealing Screw
6. Turn the selector switch to the Cental Heating and
Domestic Hot Water position (
). The power On
neon ( ) will illuminate (Fig. 42).
MIN
7. Turn a hot water tap on to give a flow rate of at
least 10l/min.
8. The pressure should be as quoted in Section 4.0
Technical Data. If not, check that the gas supply
pressure is correct (Natural Gas 20mbar, Butane
30mbar and Propane 37mbar).
Hot Water
Temperature Control
Gas Valve
Fig. 43
9. The pressure can be adjusted if required.
10. To check and set minimum pressure first remove
one of the modulator wires.
Adjusting the Pressure (Fig. 44)
11. Remove the plastic protection cap from the
pressure adjustment nuts on the valve.
Plastic
Protection
Cap
12. The smaller nut (5mm) adjusts minimum pressure
and the larger nut (8mm) maximum pressure.
13. Using a suitable spanner adjust the relevant nut
until the correct pressure is achieved.
14. Once the pressure has been set turn the boiler off
and disconnect the pressure gauge.
Modulator
Wire
Minimum Rate
Adjustment Nut
Fig. 44
Maximum Rate
Adjustment Nut
NOTE: Gas Valve Electrical
Plug shown removed for clarity.
15. Tighten the pressure test screw and refit the
modulator to the valve. Reassemble in reverse order.
25
10.0 COMPLETION
10.1
Completion
1. Hinge the facia panel upwards and engage the
securing screws. Refit the case front panel and tighten
the screws (Fig. 45).
Case Front Panel
2. Instruct the user in the operation of the boiler and
system, explaining the operational sequence.
3. Carefully read and complete all sections of the
Benchmark Commissioning Checklist at the rear of
this publication that are relevant to the appliance and
installation. These details will be required in the event
of any warranty work. The publication must be handed
to the user for safe keeping and each subsequent
regular service visit recorded.
4. For IE, it is necessary to complete a “Declaration of
Conformity” to indicate compliance with I.S. 813. An
example of this is given in I.S. 813 “Domestic Gas
Installations”. This is in addition to the Benchmark
Commissioning Checklist.
4. Hand over the Users Guide, and these Installation
and Servicing Instructions, giving advice on the
necessity of regular servicing.
Facia Panel
Fig. 45
26
11.0 SERVICING
11 .1
Case Front Panel
Annual Servicing
1. For reasons of safety and economy, it is
recommended that the boiler is serviced annually.
Servicing must be performed by a competent person.
2. After servicing, complete the relevant Service
Interval record section of the Benchmark
Commissioning Checklist at the rear of this
publication.
3. Ensure that the boiler is cool.
4. Ensure that both the gas and electrical
supplies to the boiler are isolated.
5. Slacken the screws securing the facia panel. Lift
the outercase panel so that its securing tabs are clear
of the facia. Remove the panel (Fig. 47).
Fig. 47
6. Remove the screws securing the inner door panel.
Lift the panel slightly to disengage it from the studs
on top of the case (Fig. 48).
Facia Panel
7. Note the positions of the two sensing tubes on the
outlet elbow and three wires on the fan motor and
remove them (Fig. 49).
8. Slacken the screws on the outlet sealing collar.
Ease the collar upwards as far as possible (Fig. 50).
9. Remove the four screws securing the combustion
box door and remove the door (Fig. 48).
Combustion
Box Door
Inner Door
Panel
Fig. 48
Fan Wires
Fan
Sensing Tubes
Outlet Sealing
Collar
Fig. 49
Fig. 50
27
11.0 SERVICING
11.1
Baffle
Tab
Spring Clip
Annual Servicing (Cont)
10. Remove the spring clips retaining the air box side
baffle plates. Disengage the tabs on the baffles from
the slots in the fan hood (Fig. 52).
11. Undo the screws securing the fan hood assembly
to the appliance back panel, and draw the fan and
hood assembly forwards (Fig. 51).
Fig. 52
Fig. 51
Fan and Hood
Assembly
12. Draw the burner out of the combustion box, pulling
the electrode grommets from the slots in the
combustion box lower panel (Fig. 53).
13. Disconnect the electrode leads and grommets from
the electrodes. Completely remove the burner (Fig. 53).
14. Brush any deposits from the injectors. Do not use a
pin or wire to clean them.
15. Brush the burner blades and venturis and clean the
combustion box.
16. Ensure that the heat exchanger fins are clear of
any obstruction.
D.H.W. Filters
17. If the flow of domestic hot water is diminished, it
may be necessary to clean the filters.
Fig. 53
Electrode
18. Initially check the cold water inlet tap filter.
Grommets
Threaded
Bush
19. Turn the tap off. Undo the blanking cap and remove
the threaded bush (Fig. 53a).
Fig. 53a
21. Undo the filter cartridge from the inlet/return
manifold (Fig. 56).
Burner
Electrode
Leads
Gas Supply Pipe
20. Extract the filter and rinse thoroughly in clean
water. Reassemble and check the flow. If required
clean the manifold filter as described below.
Blanking
Cap
Cold Water
Inlet Tap
22. Dismantle the cartridge and carefully remove the
flow regulator and filter gauze. Rinse them thoroughly
in clean water and reassemble in reverse order
(Fig. 55).
23. Check that the pressure vessel charge is 0.5bar,
reassemble in reverse order of dismantling.
Cartridge
Body
24. Turn the selector switch fully anticlockwise against
the spring pressure to the reset position and hold for 3
seconds to reset the boiler before recommissioning.
Filter Gauze
Fig. 56
Fig. 55
Inlet / Return Manifold
Flow
Regulator
Venturi
28
25. Complete the relevant Service Interval Record
section of the Benchmark Commissioning Checklist at
the rear of this publication and then hand it back to the
user.
12.0 CHANGING COMPONENTS
IMPORTANT: When changing components ensure
that both the gas and electrical supplies to the
boiler are isolated before any work is started.
When the component has been changed turn the
selector switch fully anticlockwise against the
spring pressure to the reset position and hold for at
least 3 seconds to reset the boiler before
recommissioning.
Pressure
Switch
Fig. 57
Sensing
Tubes
+
See Section 11.1 “Annual Servicing” for removal of
case panel, door etc.
b
br
12.1
Pressure
Switch Wires
Pressure Switch
1. Note the positions of the two sensing tubes and
wires and remove them (Fig. 57).
2. Remove the two screws holding the pressure
switch to the combustion box top panel.
3. Fit the new pressure switch and reassemble all
components in reverse order of dismantling.
Fan Wires
12.2
Fan
1. Note the positions of the two sensing tubes on the
outlet elbow and three wires on the fan motor and
remove them (Fig. 58).
g/y
b
Fig. 59
br
-
2. Slacken the screws on the outlet sealing collar.
Ease the collar upwards as far as possible (Fig. 59).
3. Remove the four screws securing the combustion
box door and remove the door.
+
Sensing Tubes
Fan and Hood
Assembly
Outlet Sealing
Collar
Fig. 58
4. Remove the spring clips retaining the air box side
baffle plates. Disengage the tabs on the baffles from
the slots in the fan hood (Fig. 61).
Flue Outlet Elbow
5. Undo the screws securing the fan hood to the
appliance back panel, and draw the fan and hood
assembly forwards (Fig. 60).
Fan
Spring Clip
Baffle
Tab
6. Remove the screws and spring washers securing
the fan to the hood. Transfer the flue outlet elbow to
the new fan (Fig. 60).
7. Fit the new fan to the hood using the screws and
spring washers previously removed.
8. Reassemble in reverse order of dismantling.
Fig. 61
Spring
Washer
Securing Screw
Fan Hood
Fig. 60
29
12.0 CHANGING COMPONENTS
12.3
Heat Exchanger (Fig. 62)
1. Note the positions of the two sensing tubes on the
outlet elbow and three wires on the fan motor and
remove them (Figs. 58 to 61).
2. Slacken the screws on the outlet sealing collar.
Ease the collar upwards as far as possible.
3. Remove the four screws securing the combustion
box door and remove the door.
4. Remove the spring clips retaining the air box side
baffle plates. Disengage the tabs on the baffles from
the slots in the fan hood.
Fig. 62
5. Undo the screws securing the fan hood to the
appliance back panel, and draw the fan and hood
assembly forwards.
6. Drain the primary circuit. Prise the two pipe
connecting clips off the joints in the flow and return
pipes.
Heat Exchanger
7. Lift the heat exchanger to disconnect the flow and
return pipe joints. Withdraw it from the appliance,
taking care not to damage the rear insulation piece.
8. Fit the new heat exchanger, ensuring that the tabs
on the side insulation carriers engage in the slots in
the heat exchanger side plates.
Pipe Connecting Clips
9. Reassemble in reverse order of dismantling, and
repressurise the system.
12.4
Burner (Fig. 63)
1. Remove the four screws securing the combustion
box door and remove the door.
2. Draw the burner out of the combustion box, pulling
the electrode grommets from the slots in the
combustion box lower panel.
3. Disconnect the electrode leads and grommets from
the electrodes. Completely remove the burner.
4. Undo the screws securing the electrodes to the
burner. Examine the condition of the electrodes,
replacing if necessary. Fit the electrodes to the new
burner.
Electrodes
Burner
Fig. 63
Electrode
Grommets
Electrode
Leads
30
5. Engage the burner location brackets over the studs
on the injector manifold and reassemble in reverse
order.
12.0 CHANGING COMPONENTS
12.5
Injector
Manifold
Injectors (Fig. 64)
Inlet Elbow
1. Remove the burner as described in Section 12.4.
2. Undo the screws securing the injector manifold to
the inlet elbow and remove the manifold.
Fig. 64
Gasket
3. Unscrew and replace injectors as required and
examine the sealing gasket, replacing as necessary.
Reassemble in reverse order.
Injector
12.6
Electrodes (Fig. 64)
1. Remove the four screws securing the combustion
box door and remove the door.
Electrodes
2. Draw the burner out of the combustion box, pulling
the electrode grommets from the slots in the
combustion box lower panel.
Grommets
3. Disconnect the lead and grommet from the
electrode being replaced. Undo the securing screw
and withdraw the electrode to the burner.
Burner
Electrode
Electrode
Leads
4. Reassemble in reverse order.
12.7
Insulation (Fig. 65)
1. Remove the four screws securing the combustion
box door and remove the door.
2. Slide the side insulation pieces carefully out of
their carriers.
3. To replace the rear insulation piece it is necessary
to remove the heat exchanger as described in
Section 12.3 and slide out the side pieces.
4. The combustion box door insulation piece can be
replaced by carefully bending up the two retaining
tabs.
Side Insulation
Rear Insulation
5. Replace all insulation pieces and reassemble in
reverse order.
13.8
Side Insulation
Combustion
Box Door
Front Insulation
Fig. 65
31
12.0 CHANGING COMPONENTS
12.8
Gas Valve (Fig. 66)
1. Undo the nut on the gas feed pipe under the boiler.
2. Completely undo the securing screws and hinge the
facia panel down.
Electrode
Lead
Earth
Wire
Modulator
Wires
Gas Valve
3. Disconnect the earth wire and pressure sensing pipe
from the valve. Undo the screw securing the electrical
plug to the valve and disconnect the plug. Disconnect
the wires from the valve modulator.
4. Pull the earth wire off the spade terminal on the
valve.
5. Remove the screws securing the inlet pipe flange to
the boiler bottom panel and those securing the outlet
manifold to the burner manifold.
6. Remove the valve from the boiler.
Electrical
Plug
Earth Wire
Inlet Pipe
Gas Feed
Pipe
Fig. 66
7. Note the orientation of the inlet pipe and outlet
manifold. Undo the securing screws and remove the
pipe and manifold.
8. Examine the ‘O’ ring seals for damage, replacing as
necessary.
9. Fit the inlet pipe and outlet manifold to the new
valve, ensuring that the ‘O’ ring seals are in place.
10. Reassemble in reverse order and check the burner
pressure (Section 9.2).
12.9
Fig. 67
Flow Pipe
Temperature Sensor (Fig. 67)
1. Ease the retaining tab on the sensor away and
disconnect the electrical plug.
2. Unscrew the sensor from it’s pocket and reassemble
in reverse order. The plug will only fit one way.
12.10 Safety Thermostat (Fig. 67)
Safety
Thermostat
1. Pull the two electrical connections off the
thermostat.
2. Remove the screws securing the thermostat to the
mounting plate on the flow pipe.
3. Reassemble in reverse order. The thermostat is not
polarised - either wire can fit either terminal on the
thermostat.
Temperature
Sensor
32
12.0 CHANGING COMPONENTS
12.11 Pump - Head Only (Figs. 68 & 69)
1. Drain the primary circuit and remove the socket
head screws securing the pump head to the body
and draw the head away.
2. Undo the screw on the pump wiring cover and
remove the cover. Using a suitable flat bladed screw
driver press the cable securing levers downwards to
release each wire after noting their position.
3. A standard Grundfos 15-50 replacement head can
now be fitted. Connect the wiring to the new head.
The pump speed must be set to 3.
4. Reassemble in reverse order.
12.12 Pump - Complete (Figs. 69 & 70)
1. Drain the primary circuit and unscrew the
automatic air vent from the pump body. Undo the two
screws securing the body to the pipe and manifold
and draw the pump forwards.
2. Undo the screw on the pump wiring cover and
remove the cover. Using a suitable flat bladed screw
driver press the cable securing levers downwards to
release each wire after noting their position.
3. Connect the wiring to the new pump. Examine the
‘O’ ring seals on the return pipe and manifold,
replacing if necessary.
Pump Wiring
Cover
Pump Body
Fig. 68
Socket Headed
Screw
4. Fit the air vent to the pump body and reassemble
in reverse order.
Pump Head
12.13 Automatic Air Vent (Fig. 70)
1. Drain the primary circuit and unscrew the
automatic air vent from the pump body.
2. Examine the ‘O’ ring seal, replacing if necessary,
and fit it to the new automatic air vent.
Pump Setting
Automatic
Air Vent
Fig. 69
3. Reassemble in reverse order.
Pump Wiring
Cover
Fig. 70
33
12.0 CHANGING COMPONENTS
12.14 Pressure Gauge
1. Drain the primary circuit and undo the nut on the
pressure gauge capillary (Fig. 71).
Fig. 71
2. Remove the timer cover and ease the timer wiring
aside. Undo the screws securing the gauge retaining
bracket (Fig. 72).
3. Remove the bracket and gauge assembly. Depress
the barbs on the side of the gauge and remove the
retaining bracket (Fig. 73).
Pressure Gauge
Capillary
4. Reassemble in reverse order.
Gauge Retaining
Bracket
Fig. 72
12.15 Expansion Vessel
1. To replace the expansion vessel it is necessary to
remove the boiler from the wall.
Timer Cover
NOTE: Alternatively a vessel of equivalent capacity
can be fitted on the system return pipe as close as
possible to the boiler.
Pressure Gauge
2. Drain the system and undo all gas and water
connections. Remove the flue elbow.
Fig. 73
Expansion Vessel
Fig. 75
3. Lift the boiler off the wall bracket and lay it on it’s
side on a clean flat surface.
4. Undo the nut on the vessel outlet spigot, and remove
the locknut and spring washer securing the spigot to
the boiler chassis (Fig. 74).
Retaining Clip
Upper Cross
Member
Fig. 74
6. Reassemble in reverse order. Fully recommission
the appliance and system.
Vessel Outlet
Spigot
Boiler
Chassis
5. Undo the screws and remove the appliance upper
cross member (Fig. 76). Slide the expansion vessel out
of the retaining clips (Fig. 75).
12.16 Gas Valve Plug/Spark Generator (Fig. 77)
Spring
Washer
Lock Nut
1. The valve electrical plug, spark generator and lead
are combined in one unit.
2. Disconnect the earth wire and electrode lead from
the plug/generator. Undo the screw securing the
plug/generator to the valve and disconnect it.
Electrode
Lead
Earth
Wire
Gas Valve
Plug/Spark Generator
Fig. 76
3. Remove the screws securing the control box cover
and release the cover retaining barbs from their slots.
Disengage the rear tabs of the cover from the control
box hinge pin.
4. Remove the plug lead from the cable clip and
disconnect the multi-pin plug from the PCB.
Fig. 77
5. Reassemble in reverse order.
34
12.0 CHANGING COMPONENTS
12.17 Pressure Relief Valve (Fig. 78)
1. Drain the primary circuit.
2. Disconnect the discharge pipe from the valve.
Using a suitable hexagon key undo the grub screw
sufficiently to release the valve.
3. Note the orientation of the valve, rotate it and
withdraw it from the manifold.
4. Fit the new valve and ‘O’ ring seal and set to the
previously noted orientation. Reassemble in reverse
order.
12.18 P.C.B.
‘O’ ring seal
1. Note the settings of the temperature control knobs.
Rotate the knobs fully anticlockwise and pull them off
the drive pins (Fig. 80).
2. Remove the screws securing the control box cover
and release the cover retaining barbs from their slots.
Disengage the rear of the cover from the control box
hinge pin (Fig. 79).
3. Note the position of all plugs and wires on the
P.C.B. and disconnect them. Pull the drive pins off
the P.C.B.
Grub Screw
Pressure Relief Valve
Fig. 78
Discharge Pipe
4. Undo the securing screws and remove the P.C.B.
5. Reassemble in reverse order, ensuring that the
temperature controllers are reset to their previous
positions (Fig. 80).
Fig. 79
Control Box Cover
6. IMPORTANT: Turn the selector switch fully
anticlockwise against the spring pressure to the
reset position and hold for at least 3 seconds to
reset the boiler.
P.C.B.
12.19 Selector Switch
Selector
Switch
1. Note the setting of the selector switch knob and
carefully pull it off the facia (Fig. 80).
Drive Pins
2. Remove the screws securing the control box cover
and release the cover retaining barbs from their slots.
Disengage the rear of the cover from the control box
hinge pin (Fig. 79).
Fig. 80
3. Note the position of the electrical connections and
the orientation of the switch. Remove the electrical
connections.
4. Remove the screws securing the switch to the facia
panel (Fig. 80).
5. Fit the new switch, ensuring that it is correctly
positioned and reassemble in reverse order.
Facia
Selector Switch Knob
Temperature Control
Knobs
35
12.0 CHANGING COMPONENTS
12.20 Plate Heat Exchanger (Fig. 81)
Plate Heat Exchanger
1. Drain the primary circuit.
Fig. 81
2. While supporting the heat exchanger undo the
screws securing it to the brass manifolds.
3. Withdraw the heat exchanger upwards and to the
left of the gas valve, taking care not to damage any
wires or controls.
Seals
4. There are four rubber seals between the manifolds
and heat exchanger which may need replacement.
Rubber Seal
5. Ease the seals out of the manifold. Replace
carefully, ensuring that when the seal is inserted into
the manifold it is parallel and pushed fully in.
6. When fitting the new heat exchanger note that the
left hand location stud is offset towards the centre
more than the right hand one.
7. Reassemble in reverse order.
12.21 Diverter Valve Assembly (Fig. 82)
The diverter valve assembly comprises of a central
heating pressure differential valve and a domestic hot
water pressure differential valve. These are connected
to a manifold which is joined to the plate heat
exchanger.
Sensing Pipes
Manifold
DHW Pressure Differential Valve (Fig. 83)
1. Drain the primary circuit.
Microswitch
Bracket
Grub Screws
Fig. 82
DHW Pressure
Differential Valve
2. Undo the screw securing the microswitch bracket to
the valve (Fig. 82).
3. Disconnect the two sensing pipes and slacken the
grub screws securing the valve to the diverter
manifold.
4. Draw the valve away from the diverter manifold.
The valve may now be replaced or split to examine
the diaphragm.
Diaphragm
Diaphragm
Spring
5. To examine the diaphragm hold the valve body
securely and carefully remove the six screws. The
diaphragm spring will force apart the two halves of the
valve.
Plastic Disc
Pushrod
6. Remove the plastic disc and pushrod assembly.
Carefully examine the diaphragm and replace it if
there is any damage.
Fig. 83
7. Reassemble in reverse order.
36
12.0 CHANGING COMPONENTS
12.21 Diverter Valve Assembly (Cont)
Central Heating
Pressure Differential
Valve
Microswitch &
Bracket
CH Pressure Differential Valve (Fig. 84)
1. Remove the DHW pressure differential valve as
described above.
Sensing Pipe
2. From the brass diverter manifold undo the nut on
the heating flow pipe. Remove the screw securing the
diverter manifold to the appliance lower bracket.
3. Disconnect the pressure gauge capillary from the
diverter manifold and remove the two wires from the
microswitch.
4. Prise off the spring clip securing the by-pass pipe
to the diverter manifold and disconnect the sensing
pipe.
By-pass
Pipe
Diaphragm
Spring Clip
Heating
Flow Pipe
Fig. 84
Diverter Manifold
5. Ease the diverter manifold out of the plate heat
exchanger manifold. Remove the assembly from the
appliance.
Pressure Gauge
Capillary
6. Undo the screw securing the microswitch bracket
to the valve body. The sensor may now be dismantled
to examine the diaphragm.
7. To examine the diaphragm hold the assembly
securely and carefully remove the four screws. The
diaphragm spring will force the two halves of the
valve apart.
8. Carefully examine the diaphragm and replace it if
there is any damage.
9. Reassemble in reverse order.
CH Pressure Microswitch
(Fig. 84)
1. Remove the two wires from the pressure
microswitch.
2. Undo the screw securing the microswitch bracket
to the valve body.
3. Reassemble in reverse order.
12.22 Flow Regulator (Figs. 85 & 86)
1. Undo the filter cartridge from the inlet/return
manifold.
Cartridge
Body
2. Unscrew the venturi and remove the flow regulator.
3. Check the cleanliness of the filter gauze, rinsing
thoroughly in clean water as necessary. Fit the new
flow regulator and reassemble in reverse order.
Filter Gauze
Fig. 86
Fig. 85
Inlet / Return Manifold
Flow
Regulator
Venturi
37
13.0 ELECTRICAL
Pump
Mains Input
Link
g/y
b
On/Off/Reset
Selector Switch
br
Fuse
bk
bk
g/y
Temperature Sensor
br
b
b
b
br
8
b
9
10
12
34
bk
bk
br
bk
17
12
18
13
19
14
20
15
M3
Optional Timers
11
br
b
br
1
r
2
r
r
r
b
3
4
5
r
16
35
Hydraulic Differential
Pressure Switch
6
M1
b
7
Gas Valve
bk
br
b
36
bk
Control PCB
M2
Overheat Thermostat
37
38
39
M7
44
M4
bk
bk
43
42
32
b
31
30
b
br
29
3-Way Valve
Microswitch
28
Air Pressure
Switch
br
27
M5
FA2
Fan
br
bk
b
r
38
- brown g - green
- black g/y - green / yellow
- blue w - white
- red
Flame
Sensing
Electrode
14.0 FAULT FINDING
Carry out initial fault finding checks
1. Check that gas, water and electrical supplies are available at the boiler. Electrical supply = 230V ~ 50 Hz.
CH water system pressurised to 0.5 bar when the boiler is cold. The preferred minimum gas pressure is 19.5mbar (natural gas), 27mbar
(butane) or 36mbar (propane).
2. Carry out electrical system checks, i.e. Ground Continuity, Resistance to Ground, Short Circuit and Polarity with a suitable meter.
Note: These checks must be repeated after any servicing or fault finding.
3. Ensure all external controls are calling for heat and check all external and internal fuses. Before any servicing or replacement of parts
ensure the gas and electrical supplies are isolated.
Refer to Section 13.0 “Electrical” for position of numbered terminals
Central Heating - Follow operational sequence
Turn selector to
neon illuminated
NO
NOTE: When instructed to turn the Selector
to the reset position turn the Selector Switch
fully anticlockwise against the spring
pressure and hold for at least 3 seconds to
reset the boiler.
Go to section ‘A’
YES
Go to section ‘B’
YES
Turn
thermostat
to max.
Pump runs
NO
External controls and,
where fitted, integral timer
calling for heat
NO
Ensure controls are set to
demand and verify the
contacts are closed
YES
Primary flow switch
operated
NO
Go to section ‘C’
YES
Fan runs at max speed
NO
YES
Has safety thermostat
been activated?
YES
NO
Turn selector to reset
position. If regular
resetting is required, or
appliance still does not
operate, investigation is
necessary
Go to section ‘J’
Go to section ‘D’
Air pressure
switch proved
NO
Go to section ‘E’
YES
Spark at ignition
electrodes for up to 10
seconds
NO
illuminated
YES
NO
YES
Turn selector to the reset
position. If the light does
not extinguish go to
sections H & K
Replace PCB
Burner on
neon
illuminated
NO
Go to section ‘F’
YES
Burner extinguishes
after 10 seconds
YES
Go to section ‘I’
NO
Burner output
modulates until set
temperature is reached
NO
Go to section ‘G’
YES
Burner goes out
YES
Fan stops
YES
Pump stops
YES
Operation sequence
correct
39
14.0 FAULT FINDING
Domestic Hot Water - Follow operational sequence
Turn selector to
neon illuminated
NO
Replace diaphragm
Go to section ‘A’
YES
YES
Is mains water
filter and differential
assembly clean?
YES
NO
YES
Turn
thermostat to
max. Open DHW tap fully.
DHW flow switch operated
NO
DHW flow rate more than
2.5l/min.
YES
Primary water is diverted
from CH system to DHW
heat exchanger and flow
microswitch operated
NO
DHW flow valve
diaphragm damaged
Continuity across DHW
flow microswitch terminals
and PCB - M1 connector
terminals 13 & 14
(terminals 12-14 open)
DHW flow valve rod
obstructed
NO
YES
Replace DHW flow
microswitch
Replace PCB
YES
Pump runs
NO
Go to section ‘B’
YES
Primary flow switch
operated
NO
Go to section ‘C’
YES
Fan runs at max speed
NO
YES
Has safety thermostat
been activated?
YES
NO
Turn selector to reset
position. If regular
resetting is required, or
appliance still does not
operate investigation is
necessary
Go to section ‘J’
Go to section ‘D’
Air pressure switch
proved
NO
Go to section ‘E’
YES
Spark at ignition
electrodes for up to 10
seconds
NO
neon illuminated
YES
NO
YES
Turn the selector to the
reset position. If the light
does not extinguish go to
section H & K
Replace PCB
Burner on
neon
illuminated
NO
Go to section ‘F’
YES
Burner extinguishes
after 10 seconds
YES
Go to section ‘I’
NO
Burner output modulates
to maintain temperature
set at thermostat
NO
YES
Close DHW tap
Reduce the DHW flow
rate. If burner does not
modulate clean
temperature sensor and
DHW heat exchanger. If
modulation does not occur
go to section ‘G’
YES
DHW flow valve
senses no flow.
Primary water diverted to
CH system. DHW flow
switch released off
NO
Diverter valve spindle
assembly faulty
YES
Burner goes out
40
NO
Fan stops
YES
Pump stops
YES
Operation sequence
correct
14.0 FAULT FINDING
Fault Finding Solutions Sections A to E
A
Is there 230V at:
1.
Main terminals L and N
2.
Main terminal fuse
3.
B
NO
Check electrical supply
YES
Selector terminals a & b
and a & 3. PCB - M1
connector terminals 9 & 10
Replace fuse
NO
Check wiring
Replace selector
neon
illuminated
NO
Replace PCB
Is there 230V at:
1.
2.
Pump
NO
If pump jammed, release
PCB - M1 connector terminals 8 & 15
Replace pump
NO
Replace PCB
YES
Change pump supply cable
C
NO
1.
CH system pressure 0.5 to 1.5 bar
2.
Check the tap of the automatic
air vent is opened
3.
Primary flow valve diaphragm damaged
Re-pressurise system
NO
Open the automatic air vent
YES
Replace diaphragm
NO
Flow valve rod obstructed
D
1.
2.
3.
Continuity across flow
microswitch and PCB M2
connector terminals 3 & 4
NO
Replace microswitch
Primary temperature sensor faulty.
Cold resistance approx. 11K ohms
(resistance reduces with increase in temp.)
Fan connections correct at fan.
PCB - M5 connector, is 230V
across terminals 28 & 29
YES
YES
Replace sensor
Fan jammed or faulty winding
YES
Replace fan
NO
Replace PCB
41
14.0 FAULT FINDING
E
F
Check and correct if necessary
1. Electrical and pressure tube connections
2. Blockage of pressure tubes
3. Restriction in flue
4. Venturi
Gas at burner
NO
NO
Replace air
pressure switch
Ensure gas is on and purged
PCB - M4 connector is approx 70-140V DC,
terminals 36 & 38
YES
Replace gas valve
NO
neon illuminated
YES
Turn selector switch
to reset position R
NO
Replace PCB
G
1.
2.
Check the burner setting pressure of
the gas valve
(see Section 9.2 of Commissioning)
Voltage at modulating coil of gas valve is:
Max. burner press.approx 9V DC (13V DC LPG)
Min. burner press.approx 1V DC
Current at modulating coil of gas valve is:
(Use an instrument with average function for this
measure)
30 ÷ 230 mA DC (45 ÷ 310 mA DC LPG)
H
42
Check and correct if necessary
1. Ignition electrode and lead
2. Electrode connection
3. Spark gap and position
YES
YES
NO
Replace gas valve
Replace PCB
230V at Main PCB - M4
connector across terminals
37 & 38 and at igniter.
Check wiring
NO
YES
Replace PCB
Replace gas valve electrical
plug/spark generator
14.0 FAULT FINDING
I
Ensure that mains input
terminal L is Live (230V) and
N is Neutral (0V)
YES
Check and correct if necessary
1. Flame sensing electrode and lead connections
2. Electrode position
YES
Flame current should be 1 µA approx.
J
Overheat thermostat operated
or faulty, i.e. continuity across
thermostat terminals
NO
NO
Replace PCB
Replace flame sensing electrode
Allow to cool. Continuity
across thermostat terminals
more than 1.5 ohm
YES
Replace safety
thermostat
YES
Replace
PCB
K
Check terminal 1 of ON/OFF/RESET selector is in
connection with PCB - M1 connector terminal 16
Check electrical continuity across terminals 1 & a
of ON/OFF/RESET selector when turned to
position R
NO
YES
Replace ON/OFF/RESET selector
Replace PCB
43
15.0 SHORT PARTS LIST
Short Parts List
140
Key G.C.
No. No.
Description
Manufacturers
Part No.
22
E66 383 Fan
248001
23
393-497 Pressure Switch
247380
32
E66 393 Heat Exchanger
248016
41
E66 398 Burner
248029
44
E66 402 Injector - 1.28 NG
248210
44
22
135
131
44
Injector - 0.77 LPG
248211
63
154
59
E66 408 Electrode Lead
248037
63
E66 411 Spark or Sensing Electrode
247384
72
E66 413 Pump Complete
248041
101
E66 432 Hydraulic Outlet Assembly
248061
102
E66 434 Valve - 3-Way Assembly
248062
103
343 619 Pressure Differential Assy
248063
23
131
Temperature Sensor
5108265
135
Safety Limit Thermostat
248079
140
Gas Valve
5107339
154
PCB
5112657
41
72
101
169
E66 453 Pressure Gauge
A
Gas Valve Plug/
102
103
169
32
44
5112385
Spark Generator & Lead
59
A
248090
16.0 NOTES
45
BENCHMARK No. 5 1 1 5 8 0 7
GAS BOILER COMMISSIONING CHECKLIST
COLLECTIVE MARK
BOILER SERIAL No.
NOTIFICATION No.
CONTROLS To comply with the Building Regulations, each section must have a tick in one or other of the boxes
TIME & TEMPERATURE CONTROL TO HEATING
ROOM T/STAT & PROGRAMMER/TIMER
PROGRAMMABLE ROOMSTAT
CYLINDER T/STAT & PROGRAMMER/TIMER
COMBI BOILER
HEATING ZONE VALVES
FITTED
NOT REQUIRED
HOT WATER ZONE VALVES
FITTED
NOT REQUIRED
THERMOSTATIC RADIATOR VALVES
FITTED
AUTOMATIC BYPASS TO SYSTEM
FITTED
TIME & TEMPERATURE CONTROL TO HOT WATER
NOT REQUIRED
FOR ALL BOILERS CONFIRM THE FOLLOWING
THE SYSTEM HAS BEEN FLUSHED IN ACCORDANCE WITH THE BOILER MANUFACTURER’S INSTRUCTIONS?
THE SYSTEM CLEANER USED
THE INHIBITOR USED
FOR THE CENTRAL HEATING MODE, MEASURE & RECORD
GAS RATE
m3/hr
ft3/hr
BURNER OPERATING PRESSURE (IF APPLICABLE)
N/A
mbar
CENTRAL HEATING FLOW TEMPERATURE
°C
CENTRAL HEATING RETURN TEMPERATURE
°C
FOR COMBINATION BOILERS ONLY
HAS A WATER SCALE REDUCER BEEN FITTED?
YES
NO
WHAT TYPE OF SCALE REDUCER HAS BEEN FITTED?
FOR THE DOMESTIC HOT WATER MODE, MEASURE & RECORD
GAS RATE
m3/hr
N/A
MAXIMUM BURNER OPERATING PRESSURE (IF APPLICABLE)
ft3/hr
mbar
COLD WATER INLET TEMPERATURE
°C
HOT WATER OUTLET TEMPERATURE
°C
WATER FLOW RATE
lts/min
FOR CONDENSING BOILERS ONLY CONFIRM THE FOLLOWING
THE CONDENSATE DRAIN HAS BEEN INSTALLED IN ACCORDANCE WITH
THE MANUFACTURER’S INSTRUCTIONS?
YES
FOR ALL INSTALLATIONS CONFIRM THE FOLLOWING
THE HEATING AND HOT WATER SYSTEM COMPLIES
WITH CURRENT BUILDING REGULATIONS
THE APPLIANCE AND ASSOCIATED EQUIPMENT HAS BEEN INSTALLED AND COMMISSIONED
IN ACCORDANCE WITH THE MANUFACTURER’S INSTRUCTIONS
IF REQUIRED BY THE MANUFACTURER, HAVE YOU RECORDED A CO/CO2 RATIO READING?
N/A
THE OPERATION OF THE APPLIANCE AND SYSTEM
CONTROLS HAVE BEEN DEMONSTRATED TO THE CUSTOMER
THE MANUFACTURER’S LITERATURE HAS BEEN LEFT WITH THE CUSTOMER
COMMISSIONING ENG’S NAME PRINT
SIGN
46
CORGI ID No.
DATE
YES
CO/CO2 RATIO
SERVICE INTERVAL RECORD
It is recommended that your heating system is serviced regularly
and that you complete the appropriate Service Interval Record Below.
Service Provider. Before completing the appropriate Service Interval Record below, please ensure you have carried out the service
as described in the boiler manufacturer’s instructions. Always use the manufacturer’s specified spare part when replacing all controls
SERVICE 1 DATE
SERVICE 2 DATE
ENGINEER NAME
COMPANY NAME
TEL No.
CORGI ID CARD SERIAL No.
COMMENTS
ENGINEER NAME
COMPANY NAME
TEL No.
CORGI ID CARD SERIAL No.
COMMENTS
SIGNATURE
SIGNATURE
SERVICE 3 DATE
SERVICE 4 DATE
ENGINEER NAME
COMPANY NAME
TEL No.
CORGI ID CARD SERIAL No.
COMMENTS
ENGINEER NAME
COMPANY NAME
TEL No.
CORGI ID CARD SERIAL No.
COMMENTS
SIGNATURE
SIGNATURE
SERVICE 5 DATE
SERVICE 6 DATE
ENGINEER NAME
COMPANY NAME
TEL No.
CORGI ID CARD SERIAL No.
COMMENTS
ENGINEER NAME
COMPANY NAME
TEL No.
CORGI ID CARD SERIAL No.
COMMENTS
SIGNATURE
SIGNATURE
SERVICE 7 DATE
SERVICE 8 DATE
ENGINEER NAME
COMPANY NAME
TEL No.
CORGI ID CARD SERIAL No.
COMMENTS
ENGINEER NAME
COMPANY NAME
SIGNATURE
SIGNATURE
SERVICE 9 DATE
SERVICE 10 DATE
ENGINEER NAME
COMPANY NAME
TEL No.
CORGI ID CARD SERIAL No.
COMMENTS
ENGINEER NAME
COMPANY NAME
TEL No.
CORGI ID CARD SERIAL No.
COMMENTS
SIGNATURE
SIGNATURE
TEL No.
CORGI ID CARD SERIAL No.
COMMENTS
47
Publication No. 5115807 - Iss. 2 (05/2005)
General Enquiries (GB)
Tel.
08706 060 780
Technical (GB)
Tel.
08706 049 049
Service (GB)
Tel.
Fax.
08701 655 644
01926 410 006
Literature Request (GB)
Tel.
08706 060 623
Technical (IE)
Tel.
1850 560570
All descriptions and illustrations provided in this leaflet have been
carefully prepared but we reserve the right to make changes and
improvements in our products which may affect the accuracy of the
information contained in this leaflet. All goods are sold subject to
our standard Conditions of Sale which are available on request.
BAXI POTTERTON
A Trading Division of Baxi Heating UK Ltd
Brownedge Road Bamber Bridge Preston Lancashire PR5 6UP
After Sales Service 08701 655 644 Technical Enquiries 08706 049 049
Website www.baxipotterton.co.uk
company