Glow-worm Ultracom hxi - Manual (Page 29)

0020107233_00 - 06/11 - Glow-worm
MAINTENANCE
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Diagram 11.4
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11.1 Servicing
IMPoRTanT: If the Combustion CO2, CO/CO2 ratio & Gas
rate checks did not require adjustment then it will not be
necessary to complete a full service.
In any case, a full service including the replacement of the
burner door seal must be carried out at least once every 5
years.
All routine servicing requirements can be achieved by the
removal of the front panel, see diagram 11.2. Position the
control box into the service position, see diagram 11.3.
Before commencing with a service or replacement of parts.
The boiler should be isolated from the electrical and gas
supplies.
13518
Diagram 11.5
11.2 Spark electrode
Disconnect the spark electrode plug and earth lead, see
diagram 11.5. Remove the two securing screws and withdraw
the spark electrode carefully from the combustion chamber,
see diagram 11.4.
Inspect the tips for damage.
Clean away any debris and check the spark gap is 3.5 to 4.5
mm.
Check the electrode gasket for signs of damage and replace if
necessary.
11.3 burner
IMPoRTanT:
● The following procedure will require that you replace the
burner door seal and nyloc nuts, Spare kit 801635.
● Removal of the burner is not necessary during a normal
service, but if it is removed it will require a new gasket, see
diagram 11.6.
● When replacing ensure that the sealing grommet, situated
below the gas valve is correctly re-seated.
Disconnect the gas valve electrical plug at the gas valve, see
diagram 11.5.
Disconnect the electrical plug from the fan.
Disconnect the spark electrode plug and earth lead, refer to
diagram 11.6.
Remove the gas pipe retaining clip.
Remove the five combustion chamber/burner door securing
nuts, see diagram 11.7, these should be discarded and
replaced with the new nylocs nuts supplied in the burner door
seal kit.
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Diagram 11.6