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6.18 Fan
Unscrew the gas joint at the top of the gas cock and remove the CVBC (red box)
from the gas valve. Unscrew the fan and gas/air manifold assembly (3 screws)
from the heat exchanger. Unplug the multi pin plug connections from the top of
the control and the fan. Remove the assembly. Replace with a new component in
reverse order.
6.19 Gas Valve & Venturi Assembly
NOTE: the gas valve is factory preset and a replacement valve must only be
supplied by Johnson & Starley Ltd.
Remove the complete fan assembly as shown at section 6.18 and remove the 4
fixing screws holding the gas feed flange on the gas valve. Remove the 2 fixing
screws securing the venturi (and gas valve) to the fan and remove the assembly
from the fan carefully removing the gasket.
Replace with a new component in reverse order, ensuring that all seals are in
good condition and correctly positioned. Check the gas rate and combustion as
described in section 5 Servicing Instructions.