Potterton MULTIPOINT Installation And Service Instructions Manual page 12

Replacement of Parts - Page 12
Fig. 20
Fig. 21
Fig. 22
6.3. THERMOCOUPLE AND SPARK ELECTRODE
a. Gain general access - see 6.2
b. Remove the fixing screw and bracket then lower the
spark electrode.
c. Disconnect the nut securing the thermocouple to the
interrupter at the chassis base.
d. Disconnect the electrode lead from the back of the
piezo unit, pull the lead up through the grommet and
remove.
e. On re-assembly, ensure that the pilot tube bends
towards the rear of the appliance.(The thermocouple
will be vertical and nearest the burner manifold).
6.4. PILOT INJECTOR
a. Gain general access - see 6.2.
b. Lift up the lint filter, disconnect the union nut and
carefully lift up the pilot tube taking care not to lose the
pilot injector.
c. On re-assembly ensure the pilot injector is correctly
seated (taper side downwards) and that the lint filter is
correctly assembled and located on the union nut.
NOTE: The lint filter can be cleaned if required.
6.5. FLAME SAFETY DEVICE
a. Gain general access - see 6.2.
b. Disengage the electrode lead from the piezo unit.
c. Release the thermocouple from the back of the flame
safety device.
d. Release the union nuts above and below the flame
safety device.
e. Release the union nut securing the pilot transfer tube to
the flame safety device.
f. Remove the 3 screws securing the flame safety device
to the chassis base and carefully withdraw the unit.
g. Re-assemble in reverse order.