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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.
The frequency of servicing will depend upon the
particular installation conditions, but in general,
once per year should be adequate.
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, or other
CORGI registered 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 noticeable
deterioration should be identified and rectified
without delay.
Thoroughly inspect the appliance for signs of
damage or deterioration especially the flue
system and the electrical apparatus.
Check and adjust – if necessary – all burner
pressure settings (see 7.3).
Check and adjust – if necessary – the system
design pressure (see 5.10).
Carry out an analysis of the flue gases (see 7.4),
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.
Ensure both flue venturis are clean and free from
any debris or obstruction.
Ensure the burner, main heat exchanger, and
latent heat collector are clean and free from any
debris or obstruction.
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
TTo 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 safety 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.
6.5
PUMP ASSEMBLY (see fig. 20)
Carry out component removal procedure as
described in 6.4.
Disconnect and remove the ancillary items
(3,4,5,6,7) from the pump assembly. Slacken and
remove the securing screw (8) from the heating
manifold. Disconnect the electrical cover & lead
(1,2). The pump assembly can now be removed
from the heating manifold. Replace in the reverse
order.
5.13
INSTRUCTING THE USER
Hand over all documentation supplied with this
appliance – including these instructions – and
explain the importance of keeping them in a safe
place.
Explain to the user how to isolate the appliance
from the gas, water, and electricity supplies, and
the locations of all drain points.
Show the user how to operate the appliance and
any associated controls correctly.
Show the user the location of the filling valve and
how to top-up the system pressure correctly, and
show the location of all manual air release points.
Explain to the user how to turn off the appliance
SECTION 6
SERVICING
for both long and short periods and advise on
the necessary precautions to prevent frost
damage.
Explain to the user that for continued safe and
efficient operation, the appliance must be
serviced annually by a competent person.
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