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44
SERVICING
Cleaning the burner and
primary heat exchanger
●
Turn off the boiler.
●
Isolate the electrical supply to the
boiler.
●
Remove the boiler case as
described on page 20.
●
Turn off the gas service valve.
●
Turn off the boiler CH service
valves.
●
Turn off the cold water inlet service
valve.
●
Release the three clamps (
1
),
remove the combustion chamber
cover (
2
) and then remove the flue
gas connector (
2a
) on the fan.
●
Remove the retaining spring (
3
).
●
Pull the three cables (
4
) and two
tubes (
5
) from the fan assembly.
●
Remove the fan assembly (
6
).
●
Remove the four screws (
7
) and
detach the front cover panel from
the combustion chamber (
8
).
●
Check the burner (
9
) and heat
exchanger fins (
10
) and remove
any loose deposits with a soft
brush.
●
Reassemble in reverse order.
Check central heating expansion
vessel.
●
Release the system water pressure
from the boiler.
●
Remove valve cap from expansion
vessel charge point.
●
Check that the internal charge
pressure of expansion vessel is
between 0.7 - 0.9 bar. If pressure
is lower than this the vessel should
be re-pressurised using an air
pump.
●
Refit valve cap.
●
Open central heating service
valves and re-pressurise the boiler
and heating system if necessary.
●
Open the gas service valve.
●
Turn on the mains power supply.
●
Operate the boiler and carry out
soundness, safety and function
checks.
●
Complete the service interval
record section in the log book and
leave with the user.
6
4
4
4
5
5
7
9
10
8
1
2
3
2a
Fig. W.1: Cleaning the burner and primary heat exchanger
Euro B/S 059/0
Note:
It is not necessary to carry out
this check every year – a check
every three years should be
sufficient.
