Servicing The Boiler - Potterton Promax 12 SL Installation And Service Instructions Manual

Air Box Door Panel
Spark
Sleeve
Sensing
Fig. 40
Earth
Combustion Box
© Baxi Heating UK Ltd 2007
Lead Terminals
Door Panel
14.0
14.1
If a combustion analyser is available the CO/CO2 can be
checked (for levels see Section 4.0). If the the reading is
acceptable, and a visual inspection of the appliance is
satisfactory, it is not necessary to perform a full strip-
down.
IMPORTANT: When servicing ensure that both the gas
and electrical supplies to the boiler are isolated before
any work is started.
"The boiler cannot be switched off at the boiler,
therefore it is important to isolate the electrical supply at
the mains fuse."
Hazardous materials are not used in the construction of
these products, however reasonable care during service
is recommended.
When replacing the combustion box door after servicing
it is essential that the retaining screws are tightened fully.
After Annual Servicing a combustion check should be
performed (see Section 14.1.11).
1. For reasons of safety and economy, it is recommended
that the boiler is serviced annually. Before servicing please
read Section 1.2 Important Information.
2. After servicing, complete the relevant Service Interval
Record section of the Benchmark Commissioning
Checklist at the rear of this publication.
3. Ensure that the boiler is cool.
Fig. 39
4. Ensure that both the gas and electrical supplies to the
boiler are isolated.
5. 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.
6. Release the four
door panel and remove the door (Fig. 39).
7. Disconnect the leads from the centre and right hand
terminals (earth and flame sensing probe) (Fig. 40).
Reconnect in reverse order.
8. Undo the four screws securing the combustion box
door and remove the door (Fig. 41).
9. Visually check for debris/damage and clean or replace if
necessary the following:
a) Burner.
b) Heat exchanger fins.
c) Fan compartment
d) Insulation.
Fig. 41
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.

Servicing the Boiler

Annual Servicing
1 / turn screws securing the air box
4
(Check also for condensate leaks).
39