Supplied By www.heating spares.co Tel. 0161 620 6677
25
221504A
Notes: To ensure the continued efficient and safe operation of
the boiler it is recommended that it is checked and serviced at
regular intervals. The frequency of servicing will depend upon
the particular installation conditions and usage, but in general
once a year should be enough.
It is the Law that any servicing must be carried out by a
competent person.
Before starting a service remove the front panel by pulling it
forward at the base and lifting off, see diagram 11.4.
As an aid to servicing the air pressure switch tube connection
can be used to obtain a products of combustion reading.
Remove the RED tube from the connection on the air pressure
switch and insert the analyser probe into the tube.
Turn on gas supply.
Switch on the electrical supply, turn the boiler thermostat fully
clockwise and the boiler will operate.
On completion of the test, switch off the electrical and gas
supplies and reconnect the red tube to the air pressure switch.
Isolate the boiler from the electrical supply and turn the gas
supply off at the gas service cock, see diagram 10.1.
Unless stated otherwise, parts removed for servicing should be
replaced in the reverse order to removal.
After completing any servicing of gas carrying components,
ALWAYS test for gas soundness and carry out functional check
of controls.
12.1 Heat Exchanger Cleaning
Remove the inner case, see diagram 10.6
Disconnect the fan air pressure tubes, electrical connections
and remove the fan assembly securing screws and fan, see
diagram 7.2.
Remove the fluehood securing angle wing nuts the securing
angle and fluehood, see diagram 7.2.
Note: 1. Before refitting the flue hood make sure that it is clean,
for example, by washing thoroughly.
2. Remove the combustion chamber front panel, see diagram
7.2.
3. When replacing the combustion chamber front panel, refer to
diagram 14.9 and make sure that the sides are in the top
location.
4. When refitting the flue hood make sure that it is correctly
located under the rear combustion chamber mounting plate
return lip.
Disconnect the ignition lead from the electrode, taking care not
to damage the lead insulation.
Unscrew the tubing nut at the base of the pilot burner, see
diagram 12.1.
Remove the burner support bracket, see diagram 12.1.
To release the pilot burner/electrode assembly remove the pilot
burner securing screws and washers and withdraw see diagram
12.1.
Spring the pilot tube downward sufficiently to allow the main
burner to move forward to disengage from the injector at the
rear. Raise the burner up through the combustion chamber and
remove.
Take care not to damage the insulation inside the combustion
chamber.
Protect the pilot tube and olive.
12 Servicing
Diagram 12.1PILOT BURNER ASSEMBLY
BURNER SUPPORT
BRACKET SECURING
SCREW AND WING NUT
PILOT
TUBE NUT
PILOT BURNER
SECURING SCREW (2)
IGNITION
LEAD
3348
Diagram 12.2MAIN BURNER INJECTOR
MAIN BURNER
INJECTOR
3340
Place a sheet of paper in the base of the combustion chamber
and clean the heat exchanger thoroughly with a suitable stiff
brush.
Do not use a brush with metallic bristles.
Remove the paper and any deposits.
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