Potterton Performa 24 Installation & Servicing Instructions Manual page 30

Fig. 66
Electrical
Plug
Earth Wire
Inlet Pipe
Gas Feed
Pipe
Fig. 67
Flow Pipe
Safety
Thermostat
Reset
Button
Temperature
Sensor
30
Gas Valve
12.0 Changing Components
12.8 Gas Valve (Fig. 66)
1. Undo the nut on the gas feed pipe at the tap rail
under the boiler.
2. Remove the securing screws and hinge the
facia panel down.
3. Disconnect the earth wire and pressure sensing
pipe from the valve. Undo the screw securing the
electrical plug to the valve and disconnect the
plug.
4. Remove the screws securing the inlet pipe
flange to the tap rail and those securing the outlet
manifold to the burner manifold.
5. Remove the valve from the boiler.
6. Note the orientation of the inlet pipe and outlet
manifold. Undo the securing screws and remove
the pipe and manifold.
7. Examine the 'O' ring seals for damage,
replacing as necessary.
8. Fit the inlet pipe and outlet manifold to the new
valve, ensuring that the 'O' ring seals are in place.
9. Reassemble in reverse order and check the
burner pressure (Section 9.2).
12.9 Temperature Sensor (Fig. 67)
1. Ease the retaining tab on the sensor away and
disconnect the electrical plug.
2. Unscrew the sensor from it's pocket and
reassemble in reverse order. The plug will only fit
one way.
12.10 Safety Thermostat / Reset (Fig. 67)
1. Pull the two electrical connections off the
thermostat.
2. Remove the screws securing the thermostat to
the mounting plate on the flow pipe.
3. Reassemble in reverse order. The thermostat is
not polarised - either wire can fit either terminal on
the thermostat.