SERVICE AND SPARES
6 720 821 670 (2018/06)52
7.8.5 LOWERING THE APPLIANCE CONTROLS TO THE SERVICE
POSITION:
1.Remove two screws securing control.
2.Pull the control forward.
3.Lower the control to align the slots at the top of the control with the
lugs on the appliance framework.
4.Hang control on two lugs on appliance framework.
Fig. 71 Control panel into service position
7.8.6 GAS VALVE
▶ Isolate gas supply at appliance gas cock.
1.Refer to figure 72 and remove the wire clip from the gas valve outlet.
2.Pull the gas pipe free from the gas valve.
If the pipe will not pull out, unscrew the nut to aid removal.
Fig. 72 Gas valve upper connection
1. Refer to figure 73 and undo bottom gas connection to gas valve.
2. Undo two securing screws on the underside of casing.
▶ Disconnect electrical connections.
▶ Pull valve up and forward out of appliance.
▶ Replace valve with new seals and check for gas tightness.
Fig. 73 Gas valve lower connection
7.8.7 AIR/GAS MANIFOLD AND FAN ASSEMBLY
▶ Remove electrical connector and earth wire the from fan.
▶ Remove wire clip from gas valve outlet then pull gas pipe free from the
gas valve (see figure 72).
Fig. 74
6720644744-36.1Wo
1.
1.
2.
3.
4.
4.
1.
2.
6720643895-72.1Wo
NOTICE: The valve will require setting; follow
procedure “Setting the air/gas ratio”.
The following components require the
air/gas manifold and fan assembly to be removed:
▶ Fan electrode assembly
▶Burner
▶ Heat exchanger
NOTICE:
▶ If the joint between the Air/Gas manifold and heat
exchanger is disturbed sealing gasket must be
replaced.
▶ After re-assembly the combustion must be checked
using the procedure in the section “Setting the Air/
Gas ratio”. Measurement and setting (if necessary) of
the gas ratio must not be attempted unless the
person is equipped with a combustion analyser
conforming to
BS 7927 and is competent in its use.
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