Servicing - Baxi System 100 HE Plus Installation & Servicing Instructions Manual

Flue Sampling Point
Air Box Door Panel
Combustion Box
Lead Terminals
Door Panel
12.0
12.1
IMPORTANT: When servicing ensure that both the gas
and electrical supplies to the boiler are isolated before
any work is started.
Hazardous materials are not used in the construction of
Baxi products, however reasonable care during service
is recommended.
1. For reasons of safety and economy, it is
recommended that the boiler is serviced annually.
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.
4. Ensure that both the gas and electrical supplies to
the boiler are isolated.
5. Remove the outercase and lower door panel.
WARNING: The PCB Control and Fan
Assembly is 325 Vdc. Isolate at supply
before access.
6. Release the four
door panel and remove the door (Fig. 40).
Fig. 40
7. Disconnect the three lead terminals from the
combustion box door taking note of their positions
(Fig. 40).
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 (Fragile - handle with care).
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 must be thoroughly cleaned
at every service (see 13.17 for removal).
NOTE: If necessary 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.
NOTE: General cleaning can be undertaken using a
vacuum.
10. Check CO/CO
Fig. 41
(Fig. 40). See section 4.0.
11. Check system pressure is between 1 and 2.5 bar.

Servicing

Annual Servicing
1 / turn screws securing the air box
4
(Check also for condensate leaks).
ratio at the flue sampling point
2
31