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SERVICING INSTRUCTIONS - Page 21
Regular skilled servicing and cleaning of the appliance is
essential to ensure continued safe and efficient operation.
The frequency of cleaning will depend upon the particular
installation conditions, and the use to which the appliance
is put, but in general, once per year should be adequate.
It is the law that all gas appliances are installed and
serviced by competent persons as stated in Gas Safety
(Installation and Use) Regulations 1994.
For Health and Safety information see back page.
Electrical installation and servicing should be carried out by
a competent person in accordance with the I.E.E. Wiring
Regulations.
Servicing is best arranged by a contract placed with
Potterton Myson Ltd., and further details are available from
Service Operations at Warwick.
The boiler DATA PLATE and WIRING DIAGRAM are
attached to the inside of the controls cover. The boiler
CODE NUMBER which should be quoted when ordering
spares or requesting information is on the front of the
control box. See FIG. 2.
All parts likely to require servicing are readily accessible.
By removing the cover from the boiler controls and
removing the front door from the boiler, most components
are exposed. Remove the front of the combustion chamber
to gain access to the main and pilot burner and the ignition
electrode. Removing of the fan and its mounting plate
exposes the flue system, i.e. the flue elbow and fluehood.
These must be removed to gain access to the flueways in
the heat exchanger for cleaning.
The following notes apply to the boiler and its controls but it
should be remembered that attention must also be paid to
the heating circuit itself including radiator
Fig. 29 BURNER AND GAS CONTROL ASSEMBLY
(White Rodgers valve illustrated)
Supplied By www.heating spares.co Tel. 0161 620 6677
valves, thermostats, the time control and the expansion
and feed water system. It is advisable to clean the boiler
immediately after the end of the heating season.
In all cases prior to servicing, light up the boiler and check
that the pilot and main burners have a clean, even flame
and that the gas rate and main burner pressure are
correctly set. If the pilot flame is satisfactory, no further
servicing of the pilot burner is necessary and the
information given in '3. PILOT BURNER' can be ignored.
WARNING
Before the start of any servicing work, switch off at the
external electricity supply by disconnecting the supply plug
at the socket or switching off the external isolating switch.
Turn off the boiler gas service cock.
NOTE: After completing any servicing or replacement of
components check for gas soundness and carry out
functional checks.
1. PREPARING THE BOILER FOR SERVICING
See FIG. 14.
NOTE: Boilers with side or rear flues have a flue elbow
fitted to the fluehood.
The elbow is replaced by an adapter on vertically flued
boilers.
A. Remove controls cover by opening the door
covering the securing screw on the underside of
the controls cover, see FIG. 14. Undo securing
screw, pull controls cover forward 10mm, lower it
to release it from its four side fixings and pull
forward clear of the thermostat knob.
B. Remove door by undoing the lower fixing screws
and lift door off the two upper hinge brackets.
21
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