Fan plug
Combustion Fan
High Fire Adjustment
Gas valve support bracket
Venturi insert clip
Venturi insert
Figure 45 Gas valve and fan components
7.3.1 Replacing the fan
1. Turn off the electric power and gas supply to the boiler.
2. Ensure the boiler cools down to the surrounding temperature. Do not drain the boiler unless
freezing conditions are expected during this procedure.
3. Remove the front cover, and then remove the four Torx 20 head screws on the top panel of
the boiler.
A ladder or step may be required to have a clear vertical view of the work area. Do not
attempt to reach from the front without a clear view, as damage to connectors, screws or
refractory may occur.
4. Undo the union nut at the gas valve outlet.
5. Carefully remove the O-ring and orifice for re-installation later.
6.
Remove the electrical connection to the fan.
7.
Move the gas valve outlet tube away from the gas valve.
8. To remove the fan, unscrew the two bolts at the base of the fan, and retain with the
washers and fan gasket.
9. Carefully lift and remove the fan from the boiler case.
10.
From the fan, remove the venturi insert clip (with a flathead screwdriver) and the gas
valve outlet tube . Retain for reassembly.
11.
From the fan inlet , remove the venturi insert .
12. Remove the fan gasket.
13. Position the fan gasket (supplied in kit) onto the new fan, so that the holes align.
14. Secure the new fan onto the heat exchanger lid with bolts and washers.
15. Ensure that the venturi insert is in place.
Section: Service and maintenance
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