Supplied By www.heating spares.co Tel. 0161 620 6677
34
BURNER REMOVAL
35
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
a)
Check that the pressure switch sensing pipes are not blocked
or damaged. It is not necessary to remove the air pressure
switch, this is not adjustable and does not require any
servicing.
a)
Inspect the heat exchanger from both above and below the
fins. If necessary, clean the fins with a soft, non metallic brush.
a)
Check that the combustion chamber insulation is not
damaged.
b)
Clean the inside of the sealed chamber using a soft brush or
(preferably) a vacuum cleaner.
c)
Check that the sealed chamber front panel seal is intact and
in good condition. Replace if necessary.
d) Always wear a protective mask when cleaning the
appliance.
a)
Re-assemble all components in reverse order except do not
pivot the control box back into position or fit the casing front
panels until the servicing work has been completed.
When re-fitting the burner it is essential to ensure that the
burner guides locate in the appropriate channel as shown in
Figure 34.
Check that all joints and seals are correctly fitted. Note that
fan polarity is immaterial.
a)
Loosen the screw at the burner pressure test point and connect
a pressure gauge to this point (Fig. 36). Turn on the gas and
electricity supply and light the boiler as described in section 5.3
b)
Check the operation of the appliance in both central heating
and DHW modes and ensure that the DHW max and
minimum burner pressures after ten minutes running are as
stated on the data badge.
c)
Remove the pressure gauge and tighten the sealing screw.
Re-light the appliance and test for gas soundness.
d)
Inspect the fan assembly (especially the impeller) for dirt,
damage, or signs of wear. If necessary clean the impeller
using a soft brush or vacuum cleaner. Spin the impeller and
check that it rotates freely, without noise, and without
imbalance. If there is any signs of deterioration or damage,
replace the fan.
a)
Check the operation of the pressure relief valve as described
in section 5.2.
b)
Check the correct 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 it’s original (cold) design pressure
(indicated by the pointer on the pressure gauge) If necessary,
re-pressurise the system as described in section 5.1 and
search for and rectify any leaks causing loss of water.
a)
Pivot the control box into the upright position and secure with
the two screws, then re-fit the front casing panels (Fig. 32).
b)
Return all appliance and external controls (if fitted) to their
original settings.
•
•
•
•
IGNITION ELECTRODE
4±1mm
DETECTION ELECTRODE
(Flame Sensor)
8±1mm
BURNER
23
