Hamworthy Sherborne Series Installation, Commissioning And Service Manual page 41

from the gas valve and refit to the replacement valve
using a thread sealant. When replacing the gas
valve, it is advisable to renew the `O` ring. See
recommended spares section for Part Nos.
For LPG applications, ensure that the gas orifice
plate is undamaged and fitted into the recess in
the gas valve outlet. (Refer fig 11.2). Do not over
tighten screws in gas valve body.
7) Re-assemble in reverse order using new gaskets
where necessary and ensuring correct orientation of
the gas valve. Ensure electrical plugs are firmly and
correctly located. Switch on gas and power supply
and check for integrity of all joints using a
proprietary leak detector.
operation is correct and safe before continuing.
6) Re-light the boiler, check and adjust the
combustion as detailed in Section 11.4
14.5 Fan Assembly
Part No. 563901376
1) To replace the fan it is preferable to remove the
complete gas valve/venturi and fan assembly.
2) Unplug the connectors from the fan (two) and the
gas valve. Disconnect the 15mm gas connection to
the gas valve inlet.
3) Remove the 4xM5 screws/nuts securing the fan/
venturi/gas valve assembly to the transition duct.
Note the use of a spacer on the screw/nut nearest
to the heat exchanger casting. Withdraw the
assembly from the air inlet duct.
4) Remove the 2xM5 screws securing the venturi/
gas valve assembly to the fan noting the cork
sealing gasket.
5) Re-assemble in reverse order using new gaskets
where necessary. Ensure all screws are tightened
and electrical plugs are firmly and correctly located.
6) Re-light the boiler, check and adjust the
combustion as detailed in Section 11.4
HAMWORTHY HEATING LTD
Ensure gas valve
SHERBORNE
14.6 Ignition Sequence Controller.
Part No. 533901379
1) Remove the front screw and loosen the rear
screw securing the fascia panel to the controls panel
body. Carefully withdraw the fascia panel and
secure on the two hooks on the control panel body.
2) Disconnect the plug connectors from the ignition
pcb, remove the 2xM4 securing screws and
withdraw the control.
3) Re-assemble in reverse order.
4) Re-light the boiler and check for operation by
turning the thermostat up and down.
14.7 Main control PCB
Part No. 533901380 – (S65) Nat Gas
Part No. 533901381 – (S70c) Nat Gas
Part No. 533901415 – (S65) LPG
Part No. 533901416 – (S70c) LPG
1) Remove the front screw and loosen the rear
screw securing the fascia panel to the controls panel
body. Carefully withdraw the fascia panel and
secure on the two hooks on the control panel body.
Disconnect the plug connectors from the main PCB.
Carefully remove the board from the plastic support
pillars and withdraw the control.
2) Re-assemble in reverse order.
Re-light the boiler and check for operation by turning
the thermostat up and down.
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500001103/E