15
Mynute
are also calling for heat. Turn the mode selector
knob to the ‘on’ position (fig. 1).
The appliance will now go through an ignition
sequence as described in 1.2. Should the appliance
fail to ignite, refer to 5.5 and/or section 7 (fault
finding).
5.7
CHECKING THE BURNER PRESSURE
Although the burner pressure is factory set, it is
necessary to check it during commissioning.
Isolate the appliance from the electrical supply
and attach a suitable manometer to the gas valve
outlet test nipple (see fig. 17). Light the boiler as
described in 5.6 and compare the reading on the
manometer with the value described in 2.2. If
adjustement is required, follow the detailed
instructions in section 7 (7.3).
Once the burner pressure has been checked,
isolate the appliance from the electrical supply,
remove the manometer, and tighten the gas
valve outlet test nipple.
5.8
FINAL FLUSHING OF THE HEATING SYSTEM
The system shall be flushed in accordance with
BS 7593. If a cleanser is to be used, it shall be
from a reputable manufacturer* and shall be
administered in strict accordance with the
manufacturers instructions.
*Both Sentinel and Fernox manufacture
products that have proved suitable for use with
Vokera appliances. Vokera Ltd. cannot
comment on the suitability of any other such
product with our appliances.
5.8.1
INHIBITORS
See 3.8.
5.9
SETTING THE BOILER OPERATING
TEMPERATURE
The flow oulet temperature can be adjusted
between 40
°
C - 80
°
C via the thermostat knob
(see fig. 1).
5.10
SETTING THE SYSTEM DESIGN PRESSURE
The design pressure should be a minimum of 1
bar and a maximum of 1,5 bar.
The actual reading should ideally be 1 bar 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, pull lever on head of safety
valve to release water until the required figure
registers on the pressure gauge (see fig. 1).
5.11
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 approximately equal.
5.12
FINAL CHECKS
●
ENSURE ALL TEST NIPPLES ON THE AP-
PLIANCE GAS VALVE HAVE BEEN
TIGHTENED AND CHECKED FOR
SOUNDNESS.
●
ENSURE THE APPLIANCE FLUE SYSTEM IS
FITTED CORRECTLY AND IS PROPERLY
SECURED.
●
ENSURE ALL PIPE WORK IS RE-CHECKED
FOR SOUNDNESS.
●
RE-FIT APPLIANCE CASING.
●
COMPLETE APPLIANCE LOGBOOK.
Complete details of the boiler, controls, installa-
tion and commissioning in the logbook supplied
with the boiler. This is an important document,
which must be correctly completed and handed
to the user. Failure to install and commission the
appliance to the manufacturers instructions may
invalidate the warranty.
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
its 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.
Fig. 17
Outlet test
nipple
Inlet test
nipple
Protective
cap
