Potterton Promax SL range Installation & Service Instructions Manual page 44

Air Box Door Panel
Earth
Spark
Sleeve
Sensing
Fig. 40
44
© Baxi Heating UK Ltd 2014
Lead Terminals
Combustion Box
Door Panel
14.0
14.2
1. Ensure that the boiler is cool.
2. The boiler cannot be switched off at the boiler, therefore it
is important to isolate the electrical supply at the mains fuse.
3. Hazardous materials are not used in the construction of
these products, however reasonable care during service is
recommended.
4. When replacing the combustion box door after servicing it is
essential that the retaining screws are tightened fully.
5. Ensure that both the gas and electrical supplies to the
boiler are isolated.
6. Remove the outercase and lower door panel (see Fitting the
Outercase, Section 13.0).
WARNING: The PCB Control and Fan
Assembly are 325 Vdc. Isolate at supply
before access.
7. Release the four
panel and remove the door (Fig. 39).
8. Disconnect the leads from the centre and right hand
terminals (earth and flame sensing probe) (Fig. 40). Reconnect
Fig. 39
in reverse order.
9. Undo the four screws securing the combustion box door
and remove the door (Fig. 41).
10. Visually check for debris/damage and clean or replace if
necessary the following:
a) Burner.
b) Heat exchanger fins.
c) Fan compartment
d) Insulation.
e) Door seals-Important: Pay particular attention to
the condition of the combustion box door seals.
f) Electrodes.
g) The condensate trap
NOTE: Remove the trap drain plug and place a vessel
underneath to catch the condensate (care should be
taken as this could be hot). Clean the trap and refit
the drain plug. Check for leaks.
h) Top of heat exchanger.
Fig. 41
Servicing the Boiler
Annual Servicing - Inspection
1 / turn screws securing the air box door
4
(Check also for condensate leaks).