Supplied By www.heating spares.co Tel. 0161 620 6677
19
UNICA BHE
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 Vokera spare
part
. It should be remembered that although cer-
tain generic components may look similar, they
will be specific to an individual appliance or prod-
uct range. Use of non-genuine Vokera spare parts
could invalidate your warranty and may pose a
potential safety hazard. The frequency of servic-
ing 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, Brit-
ish Gas, CORGI registered personnel or other
suitably qualified personnel. The following instruc-
tions 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
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 TIGHTNESS IF ANY
GAS CARRYING COMPONENTS HAVE BEEN
REMOVED OR DISTURBED.
6.4.1
AIR BOX FRONT COVER REMOVAL (fig. 21)
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. 22)
Carry out component removal procedure as de-
scribed in 6.4. Disconnect the flow pipe
(B)
from
the combustion chamber connection (only 32/36
HE), slacken the pipe at the hydraulic assembly
and swing/rotate clear of the pump assembly.
Disconnect and remove the pump outlet pipe
(C)
from the pump assembly/combustion chamber
connection.
fig. 21
Remove the expansion pipe locking pin
(D)
from
the top of the pump assembly and withdraw the
flexible pipe. Locate and remove the pressure
gauge securing pin (
D
1
) and disconnect the pres-
sure 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
fig. 22