Potterton Suprima 100, Installation & Service Instructions Manual

Page: 26 / 38

To Service the Boiler & Component Replacement - Page 26
4.3.6 Gas Valve
Gain General Access - See 4.1
1. Turn gas cock OFF, see fig.17.
Pull off the electrical connector at the valve.
2. Remove the gas cock by unscrewing the four long
hexagonal head screws from the top of the valve.
3. Remove the burner - See 4.3.4.
4. Remove the two screws securing the side and rear
insulation assembly to the front of the chassis and
remove assembly.
5. Remove the three screws securing the gas valve
manifold assembly to the chassis and remove the
complete assembly.
6. Remove the four screws securing the gas manifold to the
gas valve.
7. Use a new 'O' ring and refit the manifold to the new gas
valve.
8. Re-assemble in reverse order, use a new 'O' ring in the
gas cock and a new injector manifold gasket.