10
OVERHEAT THERMOSTAT
Two overheat thermostats E and F are fitted to the appliance
which interrupt the electricity supply in the event of overheating.
The thermostats are reset manually.
If the appliance fails to light, check that the overheat thermo-
stats have not operated by pressing the reset buttons E and F. If the
overheat thermostats stop the appliance again call a service engineer.
NOTE: If the electrical supply to the appliance is interrupted at
the isolation switch or a power failure occurs whilst the burner is fir-
ing, the boiler will normally relight automatically when the power
supply is restored. However, depending upon circumstances it may be
necessary to reset the overheat thermostats before the appliance will
operate.
TO LIGHT THE APPLIANCE
(O.F./B.F. ONLY)
See Figs 2 and 4.
Set the Operating Switch C (or programmer) to OFF. Switch off
the electricity supply. Remove the cabinet front panel by lifting off its
mountings. Turn the gas service cock D on. Check that the white nee-
dle on the pressure gauge is not below the required pressure (sealed
systems only).
Push the grey gas control knob J fully in and hold. At the same
time repeatedly press and release the red piezo igniter button K until
the pilot lights. The pilot can be seen either through the pilot win-
dow L (BF) or under the combustion
chamber door baffle (OF). When the
pilot lights, continue to hold the grey
gas control knob in for a further 15
seconds and then slowly release it.
CAUTION: If the pilot light goes
out at this, or any other stage, twist
the grey knob clockwise and release.
Wait three minutes, then repeat the
lighting procedure, holding in the grey
gas control knob for a little longer
than before.
Switch on the mains electricity
indicated by the Standby light G.
Turn the central heating tempera-
ture control B to max. Set the
Operating Switch C (or programmer)
to HEATING AND WATER and the
burner will light.
Set the Operating Switch (or pro-
grammer) to the required position.
Set the room thermostat, if fitted,
to the desired temperature. Set the
central heating temperature control B
to the required position.
Replace the cabinet front panel.
Fig. 4. O.F. & B.F. models with cabinet front cover removed
Circulating
pump
Domestic
hot water
high limit
thermostat
reset
button E
Expansion
vessel
Standby G
A
Demand H
Pilot observation window. B.F. only.
Located behind expansion vessel
Slot in front
cover. O.F.
only.
Red Piezo
igniter but-
ton K
Heatbank
Water
diverter
valve
Gas control
knob J
Pressure
gauge
Gas serv-
ice cock D
To observe pilot and burner
look in this direction
B C
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