Potterton Promax FSB 30 HE Installation & Service Instructions Manual page 46

Injector Pipe
Gas Valve
Securing Screws
Boiler Side
Fig. 53
Securing
Nut
Sensor
Leads
Condensate
Trap
Lock Nut
Service Drain
Plug
Trap to Condensate
Pump Inlet Pipe
46
© Baxi Heating UK Limited 2010
Case Pressure Pipe
Gasket
Aluminium
Spacer
'O ring'
Electrical Plug
Fig. 54
15.0 Changing Components
The removal of the fan is necessary to enable the changing of
the injector pipe, condensate trap and gas valve (see section
13.6).
15.9 Injector Pipe (Fig. 53)
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.
15.10 Gas Valve (Fig. 53)
IMPORTANT: After replacing the valve the CO
checked as detailed in Section 14.1.4 to 14.1.6. Only
change the valve if a suitable calibrated combustion
analyser is available, operated by a competent person -
see Section 14.1.3.
1. Isolate gas supply and disconnect the gas tap by removing
the four screws.
2. If required remove the condensate pump to increase access
(see Section 13.4) and undo the case pressure pipe from the
valve.
3. Disconnect the electrical plug from the gas valve.
4. Remove the fan (see Section 13.6) and injector pipe.
Gas Valve
5. Remove the two gas valve securing screws from inside the
air box holding the gas valve, and remove the valve.
Gas Tap
6. Remove the aluminium spacer and its gasket from the gas
valve.
7. Fit the aluminium spacer and its gasket to the new valve.
8. Fit the new gas valve and reassemble in reverse order.
NOTE: Check for gas tightness after replacing gas valve.
9. Check the CO 2 level. If the level is greater than that quoted,
telephone the Technical Enquiries for further advice.
15.11 Condensate Trap (Fig. 54)
1. Disconnect the condensate trap from the base of the heat
exchanger.
2. Disconnect the condensate drain 'O' ring connection from
the condensate trap and condensate pump. For ease of access
also remove the pump.
3. Undo the condensate trap lock nut.
4. Remove the condensate trap from the boiler.
5. Disconnect the sensor leads.
6. Fit the new condensate trap and reassemble in reverse
order. When refitting the pipe from the trap to the pump
ensure that all seals and connections are made.
7. Prime the condensate trap (fill first chamber), check for leaks
(see Section 8.5).
must be
2