Gas Valve Replacement - Keston Heat 45 Installation And Servicing Instructions

61 fAn RePlACeMent
1. Refer to Frame 53.
2. Remove the upper front panel (Refer
to frame 55).
3. Remove the fan and gas assembly
(Refer to frame 56).
4. Remove the screws retaining the
venturi to the fan.
5. Remove the extended nuts holding the
venturi to the fan.
6. Remove the screws retaining the fan
plate.
7. Transfer venturi and gas valve
assembly to the new fan.
8. Re-assemble in reverse order
checking seals and gaskets and
replacing if faulty or damaged.
9. Check the operation of the boiler
(Refer to frame 53).

62 GAS VAlVe RePlACeMent

1. Refer to Frame 53.
2. Remove the upper front panel (Refer to frame
55).
3. Remove the fan and gas assembly (Refer to
frame 56).
4. Remove the 3 screws holding the gas valve to
the venturi.
5. Remvove the four screws retaining the gas
valve.
6. Remove the venturi from the mixture chamber
before removing the gas valve.
7. Fit new gas valve to venturi using the new seal
provided, ensure gas injector is fitted correctly.
8. Re-assemble in reverse order checking seals
and gaskets and replacing if faulty or damaged.
9. Check the operation of the boiler (Refer to
frame 53).
48
SERVICING
Gas Management Assembly Part No's
Model Fan
45/55 176273
Gas Management Assembly Part No's
Model Fan
176273
45/55
6
Venturi Valve Injector
176360 176313 177038
Venturi Valve Injector
176360 176313 177038
Keston Heat -
Installation & Servicing
5
8
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