General Access; Pcb Enclosure; Gas Valve - Potterton Performa 9 SL HE User Manual

9. Parts Replacement
9.3
Fig. 51
gas cock
Remove four
screws
9.4
Fig. 52
Remove front
screw
Inlet pressure
test point
9.4
Fig. 53
44
Disconnect
electrical plugs
Disconnect
electrical plug
Loosen rear
screws
Burner pressure test point
Burner pressure adjustment

9.2 General Access

1. Isolate the supplies as detailed in 9.1.2.
2. Pull the door panel down and remove the two
screws. Carefully slide the bottom cover out
and away from the boiler.
3. Remove the three screws and carefully lift
the outer case away from the boiler.

9.3 PCB Enclosure

1. Perform General Access - See 9.2. Removal
of the outer case is not necessary.
2. Disconnect all electrical plugs and slide the
enclosure out of its frame.
3. On re-assembly refer to the wiring diagram
when re-connecting electrical plugs.

9.4 Gas Valve

1. Perform General Access - See 9.2. Removal
of the outer case is not necessary.
2. Note how it fits then disconnect the electrical
plug from the gas valve.
3. Remove the gas cock by unscrewing the four
long hexagonal head screws from the side of
the valve.
Note: Loosen the condensate trap securing
screws to improve access to the gas valve.
4. Using the service spanner supplied with the
new valve, remove the front screw and
loosen the two rear screws securing the gas
valve to the manifold.
5. Slide the valve backwards and carefully
remove from the boiler.
6. Re-assemble in reverse order using a new
'O' ring. Remember to re-tighten the
condensate trap and ensure the electrical
plug to the gas valve is in the correct
orientation.
7. Check the burner pressure (see data label
for pressures). If adjustment is required, turn
pressure adjusting screw anti-clockwise to
increase pressure or clockwise to decrease.
© Baxi Heating UK Ltd 2008