Supplied By www.heating spares.co Tel. 0161 620 6677
18
220459C
Diagram 10.3
Diagram 10.5
THERMOSTAT
PHIAL/OVERHEAT
CUT-OFF
10 Servicing and Replacement of Parts
Unscrew the thermocouple nut.
The pilot burner can now be lifted away.
Take care not to damage the electrode.
When replacing ensure that the spark gap is as shown in
diagram 10.3.
10.5 Thermocouple
Generally follow the instructions given in Section 10.1.
Release, but do not remove, the two screws securing the
front plate and rear gland plates. Pull the front gland
plate forward, see diagram 10.4. Disconnect the
thermocouple at the gas valve and remove.
Use the old thermocouple as a pattern when fitting the
new one. Do not tighten more than a quarter turn
beyond finger tight at the gas valve.
Check the electrode spark gap, see diagram 10.3.
10.6 Electrode
Generally follow the instructions given in Section 10.1.
Unscrew the electrode from the pilot shield.
When refitting check that the spark gap is as in
diagram 10.3.
10.7 Over Heat Cutoff
Generally follow the instructions in Section 10.1.
Remove the two screws securing the over heat cutoff
clamp, see diagram 10.5.
Release connections at the gas valve, see diagram 10.6.
Release but do not remove the two screws securing the
front and rear gland plates, see diagram 10.4 and
withdraw the cutoff leads.
When refitting smear a little of the heat sink compound,
supplied, between the face of the cutoff and the water
pipe, make sure that it is correctly located on the pipe.
PILOT FLAME & SPARK GAP
14 to 17 mm
14 to 17 mm
ELECTRODE
THERMOCOUPLE
SPARK GAP
3 to 4 mm
RELEASE SCREWS
DO NOT REMOVE
AND PULL FRONT
GLAND PLATE FORWARD
REAR
GLAND
PLATE
HEAT
EXCHANGER
THERMOSTAT
PHIAL
OVERHEAT
CUT-OFF
RETAINING
CLIP
CUT-OFF
SECURING
SCREW(S)
GLAND PLATE
Diagram 10.4
IGNITION
LEAD
OVERHEAT
CUT-OFF LEADS
THERMOSTAT
CAPILLARY
THERMO-
COUPLE
PILOT
TUBE
1053
FRONT GLAND
PLATE
0394
0951
