7.3 Gas Valve Replacement
Step 1:
Remove the burner assembly as
described in section 4 (Servicing).
Step 2:
Open the right hand access door and
disconnect the burner controller from the wiring
harness.
Step 3:
Open the left hand access door and
detach 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.
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Step 6:
Detach the two screws holding the front
of the gas valve.
Step 7:
Remove the four screws (arrowed)
holding the rear burner plate in position.
Step 8:
Remove the rear plate complete with
gas fitting .
Step 9:
The two screws retaining the gas valve
can now be removed.
Step 10:
The jet carrier and wiring harness can
now be detached from the gas valve.
Step 11:
The gas valve can now be replaced.
Step 12:
Refit all components.
Step 13:
Set pressures and ensure reliable
burner performance.
Step 14:
Test product and close access door.