12.0 Servicing the Boiler
28
12.1
Annual Servicing (Cont)
11. To clean the heat exchanger and burner
proceed as follows:
a) Disconnect the electrical leads to the fan
component protection sensor (Fig. 41).
b) Loosen the screw retaining the gas injector
pipe at the venturi (Fig. 41).
c) Undo the two wing nuts to disconnect the fan
(Fig. 41).
d) Remove the fan and disconnect the electrical
supply to it (Fig. 41).
e) Remove the gas injector pipe from the gas
valve (push-fit) (Fig. 41).
f) Undo the condensate trap securing nut, lock
nut and the condensate drain pipe. Remove the
condensate trap and disconnect the sensor
leads (Fig. 42).
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. 43) (see note, page 26).
h) Loosen the two screws retaining the heat
exchanger support bracket and slide to the left
to remove (Fig. 43).
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. 43). Replace the lower insulation
pad if necessary.
k) Ensure the heat exchanger fins are clear of
any obstruction.
l) Check condition of all seals.
m) Reassemble in reverse order.
12. 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
Lock Nut
Condensate
Trap
Condensate
Drain Pipe
Securing Nut
Central Insulation Panel
Heat Exchanger
Support Bracket
Injector Pipe
Injector Pipe
Retaining Screw
Protection
Sensor Leads
Fan
Fig. 41
Fig. 43
Fig. 42
Sensor
Leads
