Potterton Thames Installation And Servicing Instructions page 9

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Servicing - Page 9
Operate the appliance noting any faults in the component
units. Carry out the servicing procedure then correct any
other faults by reference to 'Replacement of Parts', in which
section you will find details of how to dismantle and
reassemble the following detailed components. Check that
the burner ignition is smooth and quiet when a hot tap is
opened. The burner ignition has been factory set and should
not need adjustment. However, if adjustment is required a
slow ignition screw is fitted to the appliance and is situated
above the cap screw in the water governor body (fig. 16).
Turning the screw clockwise delays the ignition, anti-
clockwise advances the ignition.
WARNING: NEVER OPERATE THIS APPLIANCE WITH
THE OUTER CASE REMOVED.
1. Check the piezo unit, flame safety device and
thermocouple, clean or replace if necessary.
2. Remove the burner assembly and clean using a soft
brush or vacuum cleaner.
3. Check the pilot injector and clean or replace if
necessary. Also clean the lint filter.
4. Remove the water governor assembly complete with
push rod. Replace the seals if necessary. Descale and
regrease the push rod, washers and diaphragm
housing using Dow Corning 111 silicone grease.
5. Remove the thermostat assembly and throttle. Replace
any seals as necessary. Descale and regrease the
push rod using Dow Coming 111 silicone grease.
6. Check for water and gas soundness. Replace 'O' rings,
sealing washers and gaskets where required.
7. Clean any deposits off the heating unit by washing or
brushing. Descale the heating unit if required.
Fig. 14
Fig. 15
Fig. 16