Gas Valve; Modulating Valve; First Solenoid Valve; Second Solenoid Valve - Potterton Combi 80 Installation & Service Instructions Manual

Replacement of Parts - Page 28
5.7

Gas Valve

- Fig. 18
1. Remove the white front case, base panel & white left
hand side panel.
See 4.1, 4.2 & 4.3 in 'Routine Maintenance'.
2. Isolate the gas supply at the gas cock (1/4 turn).
3. Remove the electrical connectors from the modulating
valve, the plug from the first solenoid valve and gas
valve compensation tube.
4. Undo the nut on the lower gas supply tube.
5. Support the gas valve assembly and undo the nut on the
burner supply pipe under the air box. Remove the gas
valve assembly from the appliance.
6. Remove the second solenoid valve (2 screws).
7. Remove the screw and disconnect the electrical
connector to the second solenoid valve and remove the
rubber gasket.
8. Before the new gas control valve is fitted, fit the rubber
gasket to the second solenoid valve and secure the
electrical connector to the second solenoid valve (1
screw), transfer the burner feed pipe and lower gas
supply tube to the new valve. Replace the 'O' rings if
necessary.
9. Re-assemble in reverse order ensuring that the black
and red wires (low voltage) are connected to the
modulator valve, polarity is not important.
5.8

Modulating Valve

1. Remove the white front case.
See 4.1 in 'Routine Maintenance'.
2. Disconnect the electrical connections to the modulating
valve. (Red and Black).
3. Remove the clear plastic cover by cutting off the nylon
tie, twisting the cover anti-clockwise 90° and levering off
with a small screwdriver.
4. Using a 14 mm spanner unscrew the complete inner
cartridge and remove with niting plate.
5. Lift off the solenoid coil and remove from metal bracket,
6. Replace in reverse order ensuring the notch in the niting
plate is located over the raised pip on the new solenoid
coil.
7. Reconnect the red and black wires to the terminations
on the modulation coil. Polarity is not important.
8. Reset the gas pressure - see Section 3 'Commissioning'.
9. Refit the clear plastic cover, snap into place and turn.
5.9 First Solenoid Valve Coil
1. Remove the white front case.
See 4.1 in 'Routine Maintenance'.
2. Disconnect the electrical connecter to the first solenoid
valve.
3. Remove the first solenoid valve (2 screws).
4. Replace the solenoid valve in reverse order.
5. Re-commission the appliance as described in Section 3.
5.10
1. Remove the white front case.
2. Remove the second solenoid valve (2 screws).
3. Remove the screw and disconnect the electrical
4. Transfer the rubber gasket to the new solenoid valve.
5. Replace the solenoid valve in reverse order.
6. Re-commission the appliance as described in Section 3.
5.11
1. Remove the white front case, base cover and air box
2. Peel off the existing case seal(s).
3. Fit new seal(s) and re-assemble, in reverse order.
- Fig. 18

Second Solenoid Valve

See 4.1 in 'Routine Maintenance'.
connecter to the second solenoid valve.

Case Seals

covers.
See 4.1, 4.2 & 4.3in 'Routine Maintenance'.