3.3 Gas Valve Replacement
Step 1 Remove the burner assembly as de-
scribed in the Servicing Sections.
Step 2 Open the right hand access door and
detach the burner controller from the wiring
harness.
Step 3 Open the left hand access door and de-
tach the impulse hoses from the air pressure
switch.
Step 4 Remove the 4 screws holding the burner
head onto the burner assembly.
Step 5 The burner head can now be detached
by disconnecting the impulse tube and the
burner head wiring.
Step 6 Detach the two screws holding the front
of the gas valve.
Step 7 Remove the four screws holding the rear
burner plate in position.
Step 8 Remove the rear plate.
Step 9 The jet carrier, gas inlet, and wiring har-
ness can now be detached from the gas valve.
Step 10 The two screws retaining the gas valve
can then be removed.
Step 11 The gas valve can now be replaced.
(ensure approved gas thread sealant is used)
Step 12 Refit all components.
Step 13 Set pressures and ensure reliable
burner performance.
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