Contents
Design principles & operating sequence Page
1.1 Principle components 3
1.2 Mode of operation (at rest) 3
1.3 Mode of operation (heating) 3
1.4 Mode of operation (Hot water) 3
1.5 Safety devices 3
Technical data Page
2.1 Central heating 4
2.2 Domestic hot water 4
2.3 Gas pressures 4
2.4 Expansion vessel 4
2.5 Dimensions 4
2.6 Clearances 4
2.7 Connections 4
2.8 Electrical 4
2.9 Flue details (concentric) 4
2.9A Flue details (twin pipes) 4
2.9B Flue details (80/125) 4
2.10 Efficiency 4
2.11 Emissions 4
2.12 Pump duty 5
General requirements (UK) Page
3.1 Related documents 6
3.2 Location of appliance 6
3.3 Gas supply 6
3.4 Flue system 6
3.5 Air supply 6
3.6 Water circulation 6
3.7 Electrical supply 7
3.8 Mounting on a combustible surface 7
3.9 Timber framed buildings 7
3.10 Inhibitors 7
3.11 Showers 7
Installation Page
4.1 Delivery 8
4.2 Contents 8
4.3 Unpacking 8
4.4 Preparation for mounting the appliance 8
4.5 Fitting the flue 8
4.6 Connecting the gas & water 10
4.7 Electrical connections 11
Commissioning Page
5.1 Gas supply installation 12
5.2 The heating system 12
5.3 Initial filling of the system 12
5.4 Initial flushing of the system 12
5.5 Pre-operation checks 12
5.6 Initial lighting 12
5.7 Checking gas pressure & combustion analysis 12
5.8 Final flushing of the heating system 13
5.9 Setting the boiler operating temperature 13
5.10 Setting the system design pressure 13
5.11 Regulating the central heating system 13
5.12 Final checks 13
5.13 Instructing the user 13
Servicing Page
6.1 General 14
6.2 Routine annual servicing 14
6.3 Replacement of components 14
6.4 Component removal procedure 14
6.5 Pump assembly 14
6.6 Safety valve 15
6.7 Lower automatic air release valves 15
6.8 Water pressure switch 15
6.9 Primary thermistor 15
6.10 Return thermistor 15
6.11 Printed circuit board 15
6.12 Gas valve 15
6.13 Electrodes and condense sensor 16
6.14 Flue fan & mixer 16
6.15 Burner 16
6.16 Main heat exchanger 16
6.17 Automatic by-pass 17
6.18 Expansion vessel 17
6.19 Condense trap removal 17
6.20 Flue collector removal 17
Checks, adjustments and fault finding Page
7.1 Checking appliance operation 19
7.2 Appliance modes of operation 19
7.3 Appliance fan speed 20
7.4 Checking the CO
2
& adjusting the valve 20
7.5 Combustion analysis test 21
7.6 Checking the expansion vessel 21
7.7 External faults 21
7.8 Electrical checks 21
7.9 Fault finding 22
7.10 Component values & characteristics 22
7.11 Boiler configuration 22
7.12 Final fault codes 22
Wiring diagrams Page
8.1 External wiring 23
8.2 Typical control applications 23
8.3 Other devices 23
8.4 Twin-channel programmer 23
Exploded diagrams Page
9.1 Table 1 25
9.2 Table 2 26
9.3 Table 3 27
9.4 Table 4 28
9.5 Table 5 29
L.P.G. instructions Page
10.1 Related documents 30
10.2 Technical data 30
10.3 Converting the appliance gas type 30
10.4 Gas supply 30
10.5 Gas supply installation 30
10.6 Adjusting the gas valve 30
10.7 Appliance fan speed 31
Benchmark 32-33
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