Piezo Unit; General Access/Main Burner - Potterton Mersey Super Installation And Service Instructions Manual

Gas fired water heater
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REPLACEMENT OF PARTS - Page 11
6.1.

PIEZO UNIT

It will NOT be necessary to remove the outer case.
a.
Slide out the bottom cover.
b.
Disengage the electrode lead from the piezo unit.
c.
Remove or loosen and pull aside the spark button
retainer, taking care not to lose the shakeproof washer.
d.
Pull off the button and unscrew (anti-clockwise) the
piezo from its housing
6.2.

GENERAL ACCESS/MAIN BURNER

a.
Turn OFF the gas and water supplies at the service
cocks.
b.
Slide out the bottom cover.
c.
Remove the 3 fixing screws and pull off the outer case.
d.
Remove 4 fixing screws from the burner assembly (2
each side).
e.
Remove 2 screws securing the front to the heating unit.
f.
Pull the burner assembly slightly forwards to clear the
injectors, then pull apart and withdraw taking care not
to snag the pilot assembly.
NOTE: If required, the burner assembly can be dismantled
and the burner bars replaced individually. On re-assembly
ensure that the burner inlets locate in the 14 holes.
NOTE: On re-assembly of the burner assembly take care not
to snag the pilot assembly. Ensure the front face of the
assembly has located on the two studs on the heating unit.
Button
Piezo Unit
Spark Button
Retainer
Shakeproof
Washer
Fig. 17
Fig. 18
Screws 2 Off
Fig. 19
Electrode
Lead
MY99033A
Screws

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