18 REPLACEMENT OF PARTS .........................................................................................................................46
18.1
To Gain General Access........................................................................................................................46
18.2
18.2.2 Removing the burner .............................................................................................................................48
18.2.5 Removing the fan...................................................................................................................................49
18.2.6 Removing the gas valve.........................................................................................................................49
18.3
Access to the Water Circuit ...................................................................................................................51
18.3.1 Drain down.............................................................................................................................................51
18.3.3 Removing the pump...............................................................................................................................52
18.4
Access to the Control System................................................................................................................54
18.4.1 Removing the PCB's..............................................................................................................................54
18.4.2 Removing the fuses ...............................................................................................................................55
18.5
19
ERROR CODES ....................................................................................................................................56
20
INCORRECT OPERATION ..................................................................................................................57
21
MAINTENANCE INSTRUCTIONS.........................................................................................................58
21.1
General Remarks...................................................................................................................................58
21.2
21.3
Operational Test ....................................................................................................................................58
22
SHORT SPARES LIST ..........................................................................................................................59
23
TECHNICAL DATA ................................................................................................................................60
24
25
SERVICE INTERVAL RECORD ............................................................................................................62
INTRODUCTION
The SYSTEM A is a fully automatic, wall mounted, low water content condensing system boiler. It is a room
sealed, fan assisted, appliance providing central heating. It has electronic ignition and is suitable for all modern
electrical control systems. The boiler has been designed for domestic use on sealed systems only. A circulating
pump, expansion vessel together with a pressure gauge and safety valve are included within the boiler.
The standard horizontal flue kit is suitable for lengths 300 mm minimum to 815 mm maximum (see pages 19 & 20)
and includes an elbow adapter that can be rotated through 360° . The horizontal flue can extend up to 5 metres
(Ø60/100) and 10 metres (Ø80/125) using 1 metre flue extension kits. 45° and 90° flue bends are also available
as accessories, for more information on the fitting of the flue kits and the suitable flue runs, please refer to Section
12 Connecting the Flue (page 19).
4