Technical data

10.0 Changing Components
39
10.3 Ignition Electrode (Fig. 114)
1. Disconnect the spark electrode lead at the
electrode.
2. Unscrew the electrode from the manifold and
withdraw the electrode.
3. Replace the new electrode in reverse order,
ensuring that the sleeving is pushed over the end
of the electrode.
10.4 Gas Valve (Fig. 115)
1. Disconnect the inlet gas cock union.
2. Remove the cover from the front face of the gas
valve and remove the electrical connections from
the tags on the gas valve.
3. Disconnect the gas valve by unscrewing the
three screws on the top face of the gas manifold. If
access to these screws is difficult the valve can be
removed with the manifold.
4. Remove the gas valve being careful not to
damage the gasket.
5. Fit the new gas valve by re-assembling all
components in reverse order, ensuring that the
gasket is properly positioned.
6. Check Burner pressure is 16mbar ± 0.5 (See
section 6.1 paragraph 2 if burner pressure needs
adjusting).
10.5 Thermostat Sensor (Fig. 116)
1. Disconnect the two electrical tags from the
sensor.
2. Prise the clip and sensor off the flow manifold.
3. Clip the new sensor to the pipe and reconnect
the wires. Either wire can be connected to either
spade terminal - there is no polarity.
10.6 Over-Heat Thermostat
(Figs.116 & 117)
1. Disconnect the two electrical tags from the
overheat thermostat.
2. Remove the two screws securing the thermostat
to the pipe.
3. Ensure the thermostat mounting plate is clean
and free of debris. Fit the new thermostat using the
screws previously removed.
4. Connect the two electrical tags to the terminals
on the overheat thermostat - either wire can be
connected onto either terminal - there is no polarity.
Fig. 114
Fig. 115
Electrode
Fig. 116
Fig. 117
Overheat
Thermostat
Flow Pipe
Thermostat Sensor
Orange Leads
Yellow Leads
British Gas Service
Test Point.
For use by B.G.
Personnel only
Regulator - Turn in
either direction to
adjust burner pressure
Thermostat
Mounting Plate