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Routine Maintenance - Page 28
5.8
Remove the Burner
(Fig. 25)
Electronic versions
a. Disconnect the two leads to the electrodes. (Do not pull
on the cable).
Permanent Pilot versions
a. Disconnect the pilot tube, thermocouple and spark
electrode lead and pull all three away from the pilot
burner. Note: The pilot injector will be loose. Do not
remove the two screws holding the pilot burner to the
main burner.
All types
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 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 (or the Low System Pressure
light is illuminated), 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 12.
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 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 Hot Water expansion vessel - access is made
by lowering the controls panel and removing the access
cover on the rear panel, also temporarily remove the
transformer - See 6.31. The vessel charge point can
now be connected. Re-pressurise the vessel to 3.5 bar
(51 p.s.i) or higher if mains water pressure is higher.
Note: If the portable pump can not easily be connected, the
vessel can be removed and re-pressurised off the appliance.
(see section 6.25, Expansion vessel D.H.W.).
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