Gas Tap, Piezo And Injectors; Piezo; Injectors - Potterton Hallmark Installation & Service Instructions Manual

9. Servicing & Replacement of Parts - Page 14
14
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9.3. Gas Tap, Piezo And Injector
a) Perform General Access -9.1.
b) Remove the split pin connecting piezo to the control rod.
c) Disconnect the union nut securing the gas pipe to the
tap.
d) Disconnect the electrode lead from the piezo unit.
e) Remove the lock nut securing the tap to the burner.
Now either the Injectors or the piezo can be removed.

9.3.1 Piezo

a) Remove the two screws securing the piezo to tap. Be
careful to retain the small spring housed between the tap
and the piezo.
Note: When re-fitting the piezo to the tap, make sure the
small spring is housed in the piezo. The engaging
ribs at the base of the piezo should also be seated
correctly in the tap slots, before securing with the
two screws.

9.3.2 Injectors

Remove the two injectors.
The injectors are of the double ceramic tipped design and the
holes should be cleaned by immersion in a suitable solvent.
DO NOT CLEAN OUT with a pin or any other similar
implement. A broken orcracked injector must be replaced
with a new one.
Notes on re-assembly - Use a suitable sealing
compound on the threads.
e) Check for gas soundness and correct operation of the
fire.
Part No. 900/9350/1