Gas valve
(see fig. 1)
• Disconnect the joints and remove the gas pipe
connecting the gas valve to the venturi.
• Disconnect the gas valve ring – nut at the bottom of
the room – sealed chamber back side.
• Remove the flanged elbow coupling of the existing
valve and fit it to the new valve; also fit a new cork
washer.
• Replace the gas valve and re-assemble the
components following the above procedure in
reverse order.
• Replace all the gas seals.
• Fully tighten the gas connections.
• Switch on the electricity, water and gas supplies
and carry out gas soundness test.
Electric fan
(see fig. 2)
• Remove and dismantle the entire burner unit (see
6.6.1 “Cleaning the burner unit”).
• Use an 8 mm spanner to unscrew the four nuts
securing the electric fan to the gas manifold and
then remove the electric fan, noting the positions of
the washer and diaphragm.
• Remove the air intake duct, unscrew the two fixing
screws from the venturi and remove the electric fan,
paying particular attention not to damage the cork
gasket.
• Replace the electric fan and re-assemble the
components following the above procedure in
reverse order.
• Switch on the electricity, water and gas supplies
and check the soundness of the joint by measuring
the CO
2
levels;
gas valve
Fig. 1
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