Contents
Design principles and operating sequence
Page
1.1
Principle components
2
1.2
Central heating mode
2
1.3
Hot water mode
2
1.4
Safety devices
2
1.5
Frost protection
2
Technical data
Page
2.1
Central heating
3
2.2
Domestic hot water
3
2.3
Gas pressure
3
2.4
Expansion vessel
3
2.5
Dimensions
3
2.6
Clearances
3
2.7
Connections
3
2.8
Electrical
3
2.9
Flue details
3
2.10
Efficiency
3
2.11
Pump duty
4
General requirements (UK)
Page
3.1
Related documents
5
3.2
Location of appliance
5
3.3
Gas supply
5
3.4
Flue system
5
3.5
Air supply
5
3.6
Water circulation
5
3.6.1
Pipework
6
3.6.2
Automatic by-pass
6
3.6.3
Drain cocks
6
3.6.4
Air release points
6
3.6.5
Expansion vessel
6
3.6.6
Filling point
6
3.6.7
Low pressure sealed system
6
3.6.8
Frequent filling
6
3.7
Electrical supply
6
3.8
Showers
6
3.9
Mounting on a combustible surface
7
3.10
Timber framed building
7
3.11
Inhibitors
7
General requirements (EIRE)
Page
3.A1
Related documents
7
3.A2
Location of appliance
7
3.A3
Gas supply
7
3.A4
Flue system
7
3.A5
Air supply
8
3.A6
Water circulation
8
3.A6.1 Pipework
8
3.A6.2 Automatic by-pass
8
3.A6.3 Drain cocks
8
3.A6.4 Air release points
8
3.A6.5 Expansion vessel
8
3.A6.6 Filling point
8
3.A6.7 Low pressure sealed system
8
3.A6.8 Frequent filling
8
3.A7
Electrical supply
8
3.A8
Showers
8
3.A9
Mounting on a combustible surface
8
3.A10
Timber framed building
8
3.A11
Inhibitors
8
3.A12
Declaration of conformity
8
Installation
Page
4.1
Delivery
9
4.2
Contents
9
4.3
Unpacking
9
4.4
Preparation for mounting the appliance
9
4.4.1
Important
9
4.4.2
Flue restrictor ring
9
4.5
Fitting the flue
9
4.5.1
Concentric horizontal flue
9
4.5.2
Concentric vertical flue
11
4.5.3
Twin flue system
11
4.6
Connecting the gas and water
13
4.6.1
Gas
13
4.6.2
Flow and return
14
4.6.3
Safety valve
14
4.6.4
Cold water inlet
14
4.6.5
Hot water outlet
14
4.7
Electrical connections
14
4.7.1
Casing removal
14
4.7.2
Electrical connection
14
4.7.3
Connecting the mains (230V) input
15
Commissioning
Page
5.1
Gas supply installation
16
5.2
The heating system
16
5.3
Initial filling of the system
16
5.4
Initial flushing
16
5.5
Filling the hot water system
16
5.6
Pre-operation checks
16
5.7
Initial lighting
16
5.8
Checking burner pressures
16
5.9
Final flushing of the heating system
17
5.9.1
Inhibtors
17
5.10
Setting the flow temperature
17
5.11
Setting the system design pressure
17
5.12
Regulating the central heating system
17
5.13
Regulating the domestic hot water
17
5.14
Final checks
17
5.15
Instructing the user
17
Servicing instructions
Page
6.1
General
18
6.2
Routine annual servicing
18
6.3
Replacement of components
18
6.4
De-scaling main heat exchanger
18
6.5
Component removal procedure
18
6.6
Pump head
18
6.7
Safety valve
18
6.8
Automatic air release valve
19
6.9
Water pressure switch
19
6.10
Domestic water flow switch
19
6.11
Pressure gauge
19
6.12
Primary and secondary thermistors
19
6.13
High limit thermostat
19
6.14
PCB
20
6.15
Integral time switch
20
6.16
Gas valve
20
6.17
Burner, injectors and spark/sense electrode
20
6.18
Flue fan
21
6.19
Heat exchanger
21
6.20
Air pressure switch
21
6.21
Expansion vessel
21
6.22
Expansion vessel (removal)
21
Checks, adjustments and fault finding
page
7.1
Checking appliance operation
22
7.2
At rest mode
22
7.3
Hot water mode
22
7.4
Heating mode
22
7.5
Frost protection mode
22
7.6
Burner pressure settings
22
7.6.1
Setting the maximum DHW gas pressure
23
7.6.2
Setting the minimum DHW gas pressure
23
7.6.3
Setting the max & min CH burner pressures
23
7.7
Combustion analysis test
23
7.8
Checking the expansion vessel
23
7.9
Electro-mechanical faults
23
7.10
Possible installation faults
24
7.11
Electrical checks
24
7.11.1
Earth continuity test
24
7.11.2
Short circuit test
24
7.11.3
Polarity check
24
7.11.4
Reversed polarity or supply fault
24
7.11.5
Resistance to earth check
24
7.11.6
Fuses
24
7.12
Fault finding
24-31
Wiring diagrams
Page
8.1
Connection of a room thermostat
32
8.2
Connection of an external time clock
32
Functional flow diagram
33-34
Exploded diagrams
Page
Table 1
35
Table 2
36
Table 3
37
Table 4
38
Table 5
39
L.P.G. instructions
Page
10.1
Technical data
40
10.2
Related documents
40
10.3
Gas supply
40
10.4
Gas supply installation
40
10.5
Burner pressures
40
10.5.1
Setting the maximum DHW gas pressure
40
10.5.2
Setting the minimum DHW gas pressure
40
10.5.3
Setting the max & min CH burner pressures
40
REAR FLUE
Page
11.1
Fitting the flue
41