Supplied By www.heating spares.co Tel. 0161 620 6677
21
30
BURNER REMOV
AL
31
ELECTRODE ALIGNMENT
6.5
AIR PRESSURE SWITCH PIPES
6.6
HEAT EXCHANGER
6.7
GENERAL
6.8
RE-ASSEMBLY
6.9
RE-COMMISSIONING
6.10
SEALED WATER SYSTEMS
6.11
FINAL CHECKS
Check that the pr
essure switch sensing pipes are not blocked or
damaged. It is not necessary to remove the air pressure switch
which is not adjustable and does not require any servicing.
Inspect the heat exchanger from both above and below the fins. If
necessary, clean the fins with a soft, non-metallic brush.
NOTE:
Safe handling of substances.
Car
e should be taken when handling the boiler insulation panels,
which can cause irritation to the skin. No asbestos, mercury or
CFCs are included in any part of the boiler or its manufacture.
a)
Check that the combustion chamber insulation is not
damaged.
b)
Clean the inside of the sealed chamber using a soft br
ush or,
preferably, a vacuum cleaner.
c)
Check that the sealed chamber fr
ont panel seal is intact and in
good condition. Replace if necessary.
d)
Always wear a pr
otective mask when cleaning the appliance.
Re-assemble all components in reverse order, but do not swing the
fascia panel back into position or fit the casing front panel until
servicing has been completed.
When re-fitting the burner, it is essential to ensure that it is level
and that it is correctly assembled into the injector. Refer to Fig. 30.
Check that all joints and seals are correctly fitted.
Note that fan polarity is immaterial.
a)
Slacken the scr
ew in the burner pressure test point and
connect a suitable manometer. Refer to Fig. 31.
Turn on the gas and electricity supply and light the boiler as
described in section 5.2
b)
Check the operation of the appliance in both CH and DHW
modes. Ensure that the DHW maximum and minimum burner
pressures after ten minutes running are as stated on the data
badge.
c)
Remove the manometer and tighten the sealing scr
ew. Re-light
the appliance and test for gas soundness.
a)
Check the operation of the pr
essure relief valve as described
in section 5.1.
b)
Check the cor
rect operation of the pressure gauge by noting
the reading when cold and check that the pressure increases
with temperature. Replace the gauge if readings are suspect.
c)
Check that the system is at its original (cold) design pr
essure.
If necessary, re-pressurise the system as described in section
5.1 and search for and rectify any leaks causing loss of water.
d)
In case of heavy pr
essure fluctuations during the heat and cool
down cycle, check the pre-charge pressure of the expansion
vessel. If the air pressure is less than 0.75bar recharge vessel
with an air pump.
a)
Swing the fascia panel into the upright position and secur
e
with the two screws.
b)
Re-fit the fr
ont casing panel. Refer to Fig. 28.
c)
Retur
n all appliance and external controls (if fitted) to their
original settings.
IGNITION ELECTRODE
DETECTION ELECTRODE
(flame sensor)
12.2
20.0
2.5 ± 0.5
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