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Routine Maintenance - Page 29
5.8
Remove the Burner
(See Fig. 24)
a. Disconnect the two leads to the electrodes. (Do not
pull on the cable).
b. Undo the hexagonal union nut under the burner, taking
care not to loose the seal *. Carefully pull the burner
forward approximately 3 mm to disengage the rear
burner supports, then lift the rear of the burner to an
angle greater than 45°. Continue to roll the burner out
of the appliance.
c.
Remove the burner injectors separately to examine
their status, clean or renew as necessary.
*
If, during removal of the burner, the burner sealing
washer becomes damaged, the appliance is supplied
as standard with two spare sealing washers. They are
in a polythene bag located on the inside face of the
base panel. Further washers can be purchased from
Potterton, Part No.13-18693.
If the boiler has been operating, care must be taken to
avoid contact with any hot ceramic fibre board or
pipework on the underside of the appliance, during
inspection and cleaning.
5.9
Gas Pressures - Adjustment
See Section 3.4. Page 21.
5.10 The Central Heating Sealed System
Check that the pressure in the system is being
maintained. The pressure gauge is fitted with a
moveable red marker which indicates the initial filling
pressure of the system when cold. If the pressure
gauge needle indicates a lower pressure than the red
marker, the system has lost pressure and should be
re-pressurised. The correct procedures are shown in
the installations section. See
`permissible methods of filling' Page 10.
5.11 Other Components
No further servicing is required on any other appliance
components. It is advisable to operate the three water
isolating taps to maintain free operation. It is
recommended that the pressure relief valve is
operated during servicing. It may occasionally be
necessary to replenish the pre-charge in the expansion
vessels. This can be readily achieved by use of a
portable air pump.
Note: The water side of either expansion vessel must
be depressurised prior to re-pressurising the air side.
Access can be made to the charging points on the
respective vessels, as follows:
a. Central Heating expansion vessel - access is made
Part No. 27/20334
to the vessel charging point from above on the right
hand side of the appliance. Re-pressurise to a
minimum of 1 bar (14.5 lb/in) or marginally greater than
the designed system pressure at the appliance when
cold, which ever is higher.
b. Domestic Water expansion vessel - access to the
vessel charging point is at the top of the vessel
underneath the black plastic cap. This can be gently
prized off using a screwdriver.
Storage Tank
The strainer will need to be checked periodically to ensure that
no blockage has occurred. Access is via a cap that unscrews.
Isolate the tank by closing the tank isolation valve and turning
on a domestic hot water tap, drain the tank using the drain
valve below the tank. This will drain most of the water from the
outlet pipework but some may still remain, therefore take care
when removing the strainer cap.
Routine Maintenance 29
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