Potterton Promax 15 HE Installation And Servicing Instructions page 33

Injector Pipe
Gas Valve
Securing Screws
Boiler Side
Electrical Plug
Fig. 55
Securing
Nut
Condensate
Trap
Sensor
Leads
Lock Nut
Condensate
Drain Pipe
Supplied By www.heating spares.co Tel. 0161 620 6677
Case Pressure
Pipe
Gasket
Aluminium
Spacer
'O ring'
Nut Union
Gas Tap
Fig. 56
13.0 Changing Components
The removal of the fan is necessary to enable
the changing of the injector pipe, condensate
trap and gas valve (see section 13.8).
13.9 Injector Pipe (Fig. 55)
1. Remove the injector pipe by pulling out from
the 'O' ring joint in the gas valve.
2. Fit the new injector pipe and reassemble in
reverse order.
13.10 Gas Valve (Fig. 55)
1. Release user interface and pivot downward for
better access.
2. Disconnect the gas inlet union at the gas tap.
3. Undo the case pressure pipe from the gas
valve.
4. Undo the screw and disconnect the electrical
plug from the gas valve.
5. Remove the two gas valve securing screws
from inside the air box holding the gas valve.
Gas Valve
6. Remove the gas valve from the airbox side.
7. Remove the nut union, aluminium spacer and
its gasket from the gas valve.
8. Fit the nut union, aluminium spacer and its
gasket to the new valve.
9. Fit the new gas valve and reassemble in
reverse order.
13.11 Condensate Trap (Fig. 56)
1. Disconnect the condensate trap from the base
of the heat exchanger.
2. Disconnect the condensate drain (outside the
boiler) from the condensate trap.
3. Undo the condensate trap lock nut.
4. Remove the condensate trap from the boiler.
5. Disconnect the sensor leads.
Fit the new condensate trap and reassemble in
reverse order.
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