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18
SECTION 6 SERVICING INSTRUCTIONS
6.1
GENERAL
To ensure the continued safe and efficient
operation of the appliance, it is recommended that
it is checked and serviced at regular intervals. To
ensure correct and safe operation of the appliance,
it is essential that any worn or failed component
be replaced only with a genuine Vokera 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 Vokera 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
Vokera 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
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Check the operation of the appliance and ensure
it functions as described in section 7.
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Compare the performance of the appliance with
its design specification. The cause of any
noticeable deterioration should be identified and
rectified without delay.
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Thoroughly inspect the appliance for signs of
damage or deterioration especially the flue
system and the electrical apparatus.
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Check and adjust – if necessary – all burner
pressure settings (see 7.4).
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Check and adjust – if necessary – the system
design pressure (see 5.10).
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Carry out an analysis of the flue gases (see
7.5), and visually check the condition of the entire
flue assembly.
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Compare the results with the appliance design
specification. Any deterioration in performance
must be identified and rectified without delay.
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Check that the burner and main heat exchanger
are clean and free from any debris or obstruction.
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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
component 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
content from the appliance via the drain valve.
Ensure some water absorbent cloths are available
to catch any residual water that may drip from the
appliance or removed component. Undertake a
complete commissioning check as detailed 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. 18)
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.
6.5
PUMP ASSEMBLY (fig. 19)
Carry out component removal procedure as
described in 6.4. Locate and remove the 2 securing
screws (A) at the rear of the pump assembly.
Disconnect the flow pipe (B, only for 30-35HE)
from the combustion chamber connection, slacken
the pipe at the hydraulic assembly and swing/ro-
tate clear of the pump assembly.
Disconnect and remove the pump outlet pipe (C)
from the pump assembly/combustion chamber
connection. Remove the expansion pipe locking
pin from the top of the pump assembly and
withdraw the flexible pipe (D). Locate and remove
the pressure gauge securing pin (D) and
disconnect the pressure gauge from the pump
assembly.
Disconnect the electrical wiring from the pump’s
electrical connection point (E). 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 reverse order.
6.6
SAFETY VALVE (fig. 19)
Carry out component removal procedure as
described in 6.4. Disconnect the outlet pipe from
the safety valve, remove safety valve locking
screw from the hydraulic manifold. Replace in the
reverse order.
clips
Fig. 18
