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4
SERVICING INSTRUCTIONS
18 REPLACEMENT OF PARTS .........................................................................................................................42
18.1 To Gain General Access........................................................................................................................42
18.1.1 Removing the front panel.......................................................................................................................42
18.1.2 Lowering the control panel.....................................................................................................................42
18.2 Access to the Combustion Chamber .....................................................................................................43
18.2.1 Removing the combustion chamber front panel ....................................................................................43
18.2.2 Removing the burner .............................................................................................................................44
18.2.3 Removing the detection electrode .........................................................................................................44
18.2.4 Removing the ignition electrode.............................................................................................................44
18.2.5 Removing the fan...................................................................................................................................45
18.2.6 Removing the gas valve.........................................................................................................................45
18.2.7 Removing the heat exchanger...............................................................................................................46
18.2.8 Removing the spark generator...............................................................................................................46
18.3 ACCESS TO THE WATER CIRCUIT ....................................................................................................47
18.3.1 Drain down.............................................................................................................................................47
18.3.2 Removing the 3 way valve.....................................................................................................................47
18.3.3 Removing the float of the flow switch ....................................................................................................47
18.3.4 Removing the secondary heat exchanger .............................................................................................48
18.3.5 Removing the pump...............................................................................................................................48
18.3.6 Removing the pressure relief valve ......................................................................................................49
18.3.7 Removing the domestic expansion vessel.............................................................................................49
18.3.8 Removing the overheat thermostat........................................................................................................49
18.3.9 Removing the temperature sensors (NTC’s) .........................................................................................49
18.3.10 Removing the pressure gauge...............................................................................................................50
18.3.11 Removing the DHW flow switch.............................................................................................................50
18.3.12 Removing & cleaning the condensate trap............................................................................................50
18.4 ACCESS TO THE CONTROL SYSTEM ...............................................................................................50
18.4.1 Removing the PCB’s..............................................................................................................................50
18.4.2 Removing the fuses...............................................................................................................................51
18.5 CONNECTING THE EXTERNAL SENSOR ..........................................................................................51
19 INCORRECT FUNCTION ..............................................................................................................................52
20 MAINTENANCE INSTRUCTIONS.................................................................................................................53
20.1 GENERAL REMARKS...........................................................................................................................53
20.2 CLEANING THE PRIMARY EXCHANGER...........................................................................................53
20.3 OPERATIONAL TEST...........................................................................................................................53
21 SHORT SPARES LIST ..................................................................................................................................54
22 TECHNICAL DATA ........................................................................................................................................55
23 BENCHMARK COMMISSIONING CHECKLIST............................................................................................57
24 SERVICE INTERVAL RECORD ....................................................................................................................58
25 NOTES...........................................................................................................................................................59
INTRODUCTION
The
COMBI A is a fully automatic, wall mounted, low water content condensing combination boiler. It is a room
sealed, fan assisted, balanced flued appliance providing central heating and mains pressure domestic hot water
on demand. It has electronic ignition and is suitable for all modern electrical control systems. The boiler is
designed for sealed systems only and a circulating pump, expansion vessel together with a pressure gauge and
safety valve are included within the boiler.
The
COMBI A range of boilers are domestic gas boilers and intended for domestic use only.
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