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SECTION 6
SERVICING INSTRUCTIONS
6.1
GENERAL
To ensure the continued safe and efficient opera-
tion of the appliance, it is recommended that it is
checked and serviced at regular intervals. To en-
sure correct and safe operation of the appliance,
it is essential that any worn or failed component
be replaced only with a genuine spare part.
It should be remembered that although certain
generic components may look similar, they will
be specific to an individual appliance or product
range. Use of non-genuine spare parts could
invalidate your warranty and may pose a potential
safety hazard. The frequency of servicing will
depend upon the particular installation conditions,
but in general, once per year should be sufficient.
It is the law that any servicing work is carried out
by competent person such as a engineer, an
approved service agent, British Gas, CORGI
registered personnel or other suitably qualified
personnel. The following instructions apply to the
appliance and its controls, but it should be
remembered that the central heating and the
domestic hot water systems would also require
attention from time to time.
6.2
ROUTINE ANNUAL SERVICING
• Check the operation of the appliance and ensure
it functions as described in section 7.
• Compare the performance of the appliance with
its design specification. The cause of any no-
ticeable deterioration should be identified and
rectified without delay.
• Thoroughly inspect the appliance for signs of
damage or deterioration especially the flue sys-
tem and the electrical apparatus.
• Check and adjust – if necessary – all burner
pressure settings (see 7.4).
• Check and adjust – if necessary – the system
design pressure (see 5.10).
• Carry out an analysis of the flue gases (see
7.5), and visually check the condition of the entire
flue assembly.
• Compare the results with the appliance design
specification. Any deterioration in performance
must be identified and rectified without delay.
• Check that the burner and main heat exchanger
are clean and free from any debris or obstruction.
• Check and clean – if necessary – the condense
trap to ensure correct operation.
6.3
REPLACEMENT OF COMPONENTS
Although it is anticipated that this appliance will
give years of reliable, trouble free service, the life
span of components will be determined by factors
such as operating conditions and usage. Should
the appliance develop a fault, the fault finding
section will assist in determining which compo-
nent is malfunctioning.
6.4
COMPONENT REMOVAL PROCEDURE
To remove a component, access to the interior of
the appliance is essential. Isolate the appliance
from the electrical supply and remove the fuse.
And when necessary, close all service valves on
the appliance, remove the appliance casing as
described in section 4.7.1 and drain the water
14
content from the appliance via the drain valve.
Ensure some water absorbent cloths are avail-
able to catch any residual water that may drip
from the appliance or removed component. Un-
dertake a complete commissioning check as de-
tailed in section 5, after replacing any component.
ALWAYS TEST FOR GAS SOUNDNESS IF ANY
GAS CARRYING COMPONENTS HAVE BEEN
REMOVED OR DISTURBED.
6.4.1
AIR BOX FRONT COVER REMOVAL (fig. 17)
Locate the two clips and remove air box front
cover. If it's necessary to remove the air box side
cover, locate and remove the 4 securing screws.
fig. 17
6.5
PUMP ASSEMBLY (fig. 18)
Carry out component removal procedure as de-
scribed in 6.4. Disconnect the flow pipe from the
combustion chamber connection (only 32/36 HE),
slacken the pipe at the hydraulic assembly and
swing/rotate clear of the pump assembly (C).
Disconnect and remove the pump outlet pipe from
the pump assembly/combustion chamber
connection.
C
fig. 18
Remove the expansion pipe locking pin from the
top of the pump assembly and withdraw the flexible
pipe. Locate and remove the pressure gauge
securing pin (D1) and disconnect the pressure
gauge from the pump assembly. Disconnect the
electrical wiring from the pump's electrical
connection point (E). Locate and remove the 2
securing screws (A) at the rear of the pump as-
sembly. Remove locking pin (F) from pump base
and lift pump assembly clear of the hydraulic
manifold. The pump assembly can now be removed
from the appliance. Replace carefully in the re-
verse order.
clips
H
G
A
D
D1
E
F
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