32
NOTE
Please refer to 3 - 3E and use the appropriate PPE when
carrying out any of the actions or procedures contained within
this section.
7.1 GENERAL
Once the appliance has been serviced, the benchmark Service
Record must be completed.
For UK only: It is important that the Benchmark Service Record
is correctly completed and handed to the user. Failure to install
and commission the appliance to the manufacturers instructions
will invalidate the warranty.
To ensure the continued safe and efficient operation of the ap
-
pliance, 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 Vokèra 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 Vokèra spare parts could
invalidate your warranty and may pose a potential safety haz-
ard. 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 Vokèra engineer, an approved
service agent, British Gas, GAS SAFE 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.
7 SERVICING INSTRUCTIONS
7.2 ROUTINE ANNUAL SERVICING
• Check the operation of the appliance and ensure it functions
as described in section 8.
• 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 8.3).
• Check and adjust – if necessary – the system design pres-
sure (see 6.11).
• Carry out an analysis of the flue gases (see 8.3), 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 recti
-
fied without delay.
• Check that the main heat exchanger is clean and free from
any debris or obstruction.
• Check and clean – if necessary – the condense trap to ensure
correct operation.
The flame side of the burner is made of state-of-the-art material.
Being fragile:
- be particularly careful when handling, mounting or disman-
tling the burner and adjacent components (e.g. electrodes,
insulation panelling etc.)
- avoid direct contact with any cleaning appliance (e.g. brushes,
aspirators, blowers, etc.).
This component does not need any maintenance, please do
not remove it from its housing, except where the O-ring may
have to be replaced.
The manufacturer declines all responsibility in cases of dam-
ages due to failing to observe the above.
SETTING THE DHW OUTLET TEMPERATURE
The DHW outlet temperature can be adjusted between 37 °C
- 60 °C via the buttons
A & B
(Fig. 1).
6.11 SETTING THE SYSTEM DESIGN
PRESSURE
The design pressure should be a minimum of 0.5 bar and a
maximum of 1.5 bar. The actual reading should ideally be 1bar
plus the equivalent height in metres (0.1 bar = 1 metre) to the
highest point in the system above the base of the appliance (up
to the maximum of 1.5 bar total).
N.B.
The safety valve is set
to lift at 3 bar/30 metres/45 psig. To lower the system pressure
to the required value, drain off some water from the appliance
drain valve until the pressure is correct.
6.12 REGULATING THE CENTRAL HEATING
SYSTEM
Fully open all radiator and circuit valves and run the appliance
for both heating and hot water until heated water is circulating.
If conditions are warm remove any thermostatic heads. Adjust
radiator return valves and any branch circuit return valves until
the individual return temperatures are correct and are approxi-
mately equal.
6.12.1 5.11.1 REGULATING THE DHW FLOW-RATE
The appliance is fitted with a flow rate restrictor that limits the
maximum flow rate that can be drawn through the appliance.
The restrictor eliminates the need to manually adjust the DHW
flow rate. However if it is felt necessary to further increase or
decrease the available flow rate, spare restrictors are available
from Vokèra spare parts.
The spare flow rate restrictors can be fitted to either increase
or decrease the maximum flow rate.
6.12.2 FLOW-RATE RESTRICTOR
The boiler is supplied with the following flow restrictor.
VISION PLUS 25C:
8 - litres flow restrictor
VISION PLUS 30C:
11 - litres flow restrictor
6.13 FINAL CHECKS
• ENSURE ALL TEST NIPPLES ON THE APPLIANCE GAS
VALVE ARE TIGHT AND CHECKED FOR TIGHTNESS.
• ENSURE THE APPLIANCE FLUE SYSTEM IS FITTED
CORRECTLY AND IS PROPERLY SECURED.
• ENSURE ALL PIPE WORK IS RE-CHECKED FOR TIGHT-
NESS.
• RE-FIT APPLIANCE CASING.
• COMPLETE BENCHMARK CHECKLIST.
FOR UK ONLY
Complete details of the boiler, controls, installation and com-
missioning in the Benchmark checklist at the back of this
book. It is important that the Benchmark checklist is correctly
completed and handed to the user. Failure to install and com-
mission the appliance to the manufacturers instructions will
invalidate the warranty.
6.14 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 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.
IMPORTANT
To validate the appliance warranty, it’s necessary to register
the appliance details with us. The warranty can be registered
in several ways:
• online at: www.vokera.co.uk (UK) or www.vokera.ie (Ireland)
• for UK residents by calling: 0800 479 0754
• for ROI residents by calling: 056 7755 055