Supplied By www.heating spares.co Tel. 0161 620 6677
19
ROUTINE SERVICING
6
To ensure continued efficient operation of the appliance, it is
recommended that it is checked and serviced as necessary at
regular intervals. The frequency of servicing will depend upon the
particular installation conditions and usage but in general once a
year should be adequate. It is the law that any service work must
be carried out by a competent person such as British Gas or other
CORGI registered personnel.
The boiler incorporates a flue sampling point on the fan pressure
sensing tube, located at the top right hand side of the boiler. If
the service engineer has suitable equipment to analyse the flue
gas, the plastic cap may be removed and a 6mm inside diameter
sample tube fitted. The front painted case and the right hand
portion of the case must be removed to gain access. Do not
forget to replace the plastic cap after use.
Before commencing any service operation, ISOLATE the mains
electrical supply, remove the front painted door by sliding up and
then away from the boiler, remove the right hand portion of the
case by unscrewing the upper and lower right hand screws
(Fig. 15) and sliding the case away from the appliance. TURN
OFF the gas supply at the main service cock. Remove the four
screws securing the left hand case. Remove the case by sliding it
forwards and off the appliance. Service the appliance by
following the full procedure detailed below:
6.1
MAIN BURNER ASSEMBLY
a)
Disconnect the two electrode wires from the gas valve
assembly and feed them through the sealed chamber
grommet to the burner.
b)
Remove the combustion chamber/collector hood front by
easing it forwards out of the boiler.
c)
The burner will now slide forwards out of the boiler complete
with its electrodes.
d)
Inspect and, if necessary, clean the burner assembly. If either
electrode shows signs of damage or wear replace it.
e)
Inspect and, if necessary, clean the main injector which
remains fitted inside the boiler.
6.2
FAN ASSEMBLY
f)
Disconnect the electrical connections to the fan.
g)
Remove the two screws securing the fan assembly and remove
by sliding it down a few mm, rotate the top forwards and slide
the assembly up and out of the boiler.
h)
Inspect the fan assembly (especially the impellor) for dirt,
deposits, or debris by looking through the air intake. Clean
with a soft brush if necessary.
6.3
HEAT EXCHANGER
i)
Remove the flue baffles.
j)
Inspect the heat exchanger from both above and below the
fins. If necessary clean the fins with a suitable brush.
k)
Reassemble all components in reverse order except the right
hand case and front door which should not be refitted until
the burner pressure has been checked. Ensure that all joints
and seals are correctly fitted. (Polarity is immaterial on the fan
L and N connections). When refitting the burner assembly,
push the burner assembly backwards until the burner brackets
stop against the rear of the boiler. The ignition electrode
should be at the front LHS of the burner.
l
) Unscrew and connect a pressure gauge to the burner pressure
test point on the multifunctional control. (Fig. 29)Turn on the
gas and electricity supply and light the appliance as described
in section 5.
m)
Check the operation of the appliance and ensure that the
burner pressure after at least 10 minutes running is as stated
on the data plate or in section 2.l. Adjust if necessary as
described in section 5.
n)
Turn off the boiler and remove the pressure gauge and tighten
the sealing screw. Relight the appliance and test for gas
soundness.
o)
Refit the right hand inner case and front panel.
p)
Return all appliance controls to their original settings.
6.4
RE-ASSEMBLE &
RE-COMMISSION
