16
Mynute
SECTION 6 SERVICING
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.
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 a 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
system will 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 both the burner and heat exchanger are
clean and free from any debris or obstruction.
●
Inspect all joints for signs of leakage and repair
if necessary.
●
Refer to the commissioning section and/or re-
placement of parts section for detailed
instruction if required.
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, 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 HEAD (see fig. 18)
Carry out component removal procedure as de-
scribed in 6.4.
Using a 4mm Allen key or ‘T’ bar, unscrew and
remove the four Allen screws that hold the pump
in position, pull firmly on the pump head to release
it from the base. Disconnect the electrical leads.
Replace in the reverse order.
6.6
SAFETY VALVE (see fig. 19)
Carry out component removal procedure as de-
scribed in 6.4.
Disconnect the outlet pipe from the safety valve,
remove safety valve locking screw from appliance
manifold.
Replace in the reverse order.
Fig. 18
1 Hydraulic manifold
2 Safety valve locking screw
3 Pressure gauge locking screw
4 Safety valve
5 Water pressure switch
6 Bleed/drain nipple
7 Automatic bypass
8 Water pressure switch, locking screw
Automatic
air-vent
Complete pump assembly
Fig. 19
1
2
3
4
5
6
7
8