Technical data

Contents
Design principles and operating sequence Page
1.1 Principle components 2
1.2 Mode of operation (at reset) 2
1.3 Mode of operation (Heating) 2
1.4 Mode of operation (DHW) 2
1.5 Safety devices 2
1.6 Optional accessories 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 (concentric) 3
2.9A Flue details (twin pipes) 3
2.10 Efficiency 3
2.11 Pump duty 4
2.12 Emissions 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 6
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 6
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 7
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
4.5 Fitting the flue 9
4.5.1 Concentric flue
4.5.2 Concentric horizontal flue 60/100 mm 9
4.5.3 Concentric vertical flue 60/100 mm 11
4.5.4 Concentric horizontal flue 80/125 mm 12
4.5.5 Concentric vertical flue 80/125 mm 13
4.5.6 Twin flue system 14
4.6 Connecting the gas and water 16
4.6.1 Gas 16
4.6.2 Flow and return 16
4.6.3 Cold water inlet 16
4.6.4 Hot water outlet 16
4.6.5 Safety valve 16
4.6.6 Condense pipe 17
4.7 Electrical connections 17
4.7.1 Casing removal 17
4.7.2 Appliance terminal block 17
4.7.3 Connecting the mains (230V) input 17
4.7.4 Connecting the Vokera time clock 18
Commissioning Page
5.1 Gas supply installation 19
5.2 The heating system 19
5.3 Initial filling of the system 19
5.4 Initial flushing 19
5.5 Filling the hot water system 19
5.6 Pre-operation checks 19
5.7 Initial lighting 19
5.7.1 Checking burner pressures 19
5.8 Final flushing of the heating system 20
5.8.1 Inhibtors 20
5.9 Setting the boiler operating temperature 20
5.9.1 Setting the domestic hot water temperature 20
5.10 Setting the system design pressure 20
5.11 Regulating the hot water 20
5.11.1 Changing the flow restrictor 20
5.11.2 Regulating the central heating system 20
5.12 Final checks 20
5.13 Instructing the user 20
Servicing instructions Page
6.1 General 21
6.2 Routine annual servicing 21
6.3 Replacement of components 21
6.4 Component removal procedure 21
6.5 Pump assembly 21
6.6 Safety valve 22
6.7 Automatic air release valve 22
6.8 Water pressure switch 22
6.9 Pressure gauge 22
6.10 Primary thermistors 22
6.11 High limit thermostat 23
6.12 Printed circuit board 23
6.13 Gas valve 23
6.14 Integral time switch 24
6.15 Electrode, burner thermostat, burner & injectors 24
6.16 Flue fan 25
6.17 Main heat exchanger 25
6.18 Air pressure switch 25
6.19 Flow restrictor 25
6.20 DHW flow switch 25
6.21 DHW heat exchanger 26
6.22 Valve actuator 26
6.23 Divertor valve assembly 26
6.24 Secondary thermistor 27
6.25 Automatic by-pass 27
6.26 DHW non-return valve 27
6.27 Expansion vessel 27
6.27.1 Expansion vessel removal 27
6.27.2 Expansion vessel removal 27
6.28 Latent heat collector 28
6.28A Dismantling the latent heat collector 28
6.29 Condense trap removal 28
Checks, adjustments and fault finding page
7.1 Checking appliance operation 29
7.2 Appliance mode of operation 29
7.2.1 Selector switch in the off position 29
7.2.2 Selector switch in the hot water only position 29
7.2.3 Selector switch in the heating & hot water position 29
7.2.4 Appliance functions 29
7.2.5 Heating mode 29
7.2.6 DHW mode 30
7.3 Checking and adjusting burner pressure 30
7.3.1 Setting the maximum burner pressure 30
7.3.2 Setting the minimum burner pressure 30
7.4 Combustion analysis test 30
7.5 Checking the expansion vessel 31
7.6 External faults 31
7.6.1 Installation faults 31
7.7 Electrical checks 31
7.7.2 Short circuit test 31
7.7.3 Polarity check 31
7.7.4 Reversed polarity or supply fault 31
7.7.5 Resistance to earth check 32
7.8 Fault finding 32
7.9 Fault codes 33-40
Wiring diagrams Page
8.1 External wiring 41
8.2 Typical control applications 41
8.3 Vokera time clock 41
8.4 Vokera remote control 41
8.5 Vokera room thermostat 41
8.6 Other controls 41
Exploded diagrams Page
Table 1 - 5 45 - 49