12.0 SERVICING
30
Publication No. 5106451
12.1
Annual Servicing (Cont)
NOTE: General cleaning can be undertaken
using a vacuum. However debris should only
be gently blown off the burner skin due to its
fragile nature.
10. To clean the heat exchanger and burner
proceed as follows:
a) Disconnect the electrical leads to the fan
component protection sensor (Fig. 42).
b) Loosen the screw retaining the gas injector pipe
at the venturi (Fig. 42).
c) Undo the two wing nuts to disconnect the fan
(Fig. 42).
d) Remove the fan and disconnect the electrical
supply to it (Fig. 42).
e) Remove the gas injector pipe from the gas valve
(push-fit) (Fig. 42).
f) Undo the condensate trap securing nut, lock nut
and the condensate drain pipe. Remove the
condensate trap and disconnect the sensor leads
(Fig. 43).
g) Remove the two screws securing the burner and
remove the burner. Visually inspect the internal
burner baffle for obstruction.
NOTE:
The burner skin is fragile - handle with
care. Clean and if necessary replace the burner
(Fig. 44) (see note above).
h) Loosen the two screws retaining the heat
exchanger support bracket and slide to the left to
remove (Fig. 44).
i) Remove the four screws securing the heat
exchanger/combustion box base and withdraw the
base.
j) Lower the central insulation panel and check
condition (Fig. 44). Replace the lower insulation pad
if necessary.
k) Ensure the heat exchanger fins are clear of any
obstruction.
l) Check condition of all seals.
IMPORTANT:
Pay
particular attention to the condition of the combustion
box door seals.
m) Reassemble in reverse order.
11. Complete the relevant section of the
“Benchmark” Installation, Commissioning and
Service Record Log Book and hand it back to the
user.
Combustion Box Base
Securing Screws
Burner Securing
Screws
Combustion
Box Base
Burner
Wing Nuts
Electrical Supply
Central Insulation Panel
Heat Exchanger
Support Bracket
Injector Pipe
Injector Pipe
Retaining Screw
Protection
Sensor Leads
Fan
Fig. 42
Fig. 44
Lock Nut
Condensate
Trap
Condensate
Drain Pipe
Securing Nut
Fig. 43
Sensor
Leads
