Glow-worm Xtramax - Manual (Page 30)

30 4000116705-2
17 Routine Cleaning and Inspection
17.10 Spark and Sense Gaps
• Check that the spark and sense gaps as shown in diagram
17.5.
17.11 Domestic hot water discharge (Annual
Check)
Refer to diagram 5.1. Open expansion valve (24) and
temperature/pressure release valve (27) and check that the
discharge outlet is not blocked (D2) and that the valves close,
check the pressure reducing valve and strainer and clean if
necessary, check the air pressure in the domestic expansion
vessel (26) and recharge if required.
17.12 Reassembly of parts removed for
servicing
All parts are replaced in reverse order to removal.
17.13 Flue system
• Check externally to make sure that flue is not blocked
• Inspect flue system to make sure that all fittings are secure.
17.14 Operation of fan
• Switch on electrical supply and turn on gas.
• Light burner by opening a hot water tap.
• Check that fan operates when burner lights and stops when it
goes out.
17.15 Cold water inlet filter
Drain down domestic hot water circuit of boiler only, as follows:
• Close isolating valve/throttle (m) on cold water isolating cock,
see diagram 8.1.
Note: This valve is closed when screwed fully clockwise.
• Drain DHW boiler circuit, refer to Section 4.2.
• Undo connecting nut from boiler cold water inlet connection.
• Clean and inspect filter, replace if necessary, see diagram
17.6.
• With both filter and restrictor in place, reconnect connecting
pipe to inlet connection and tighten.
• Fully open isolating valve/throttle on cold water inlet and check
for leaks.
4mm
4mm
5mm
SPARK GAP
SENSE GAP
9326
Diagram 17.5
9327
Diagram 17.6
9339
FLOW
RESTRICTOR
AND COLD
WATER INLET
FILTER