VOKERA RAIN 24 Installation And Servicing Instructions - page 14
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Isolate the appliance from the electrical supply
and attach a suitable manometer to the gas valve
outlet test nipple (see fig. 11). Light the boiler as
described in 5.6 and compare the reading on the
manometer with the value described in section 2.
If adjustment 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
I. S. 813 and the DWTA Code of Practice. If a
cleanser is to be used, it must be suitable for low
water content, copper heat exchangers. It shall
be from a reputable manufacturer and shall be
administered in strict accordance with the manu-
facturing instructions.
5.8.1
INHIBITORS
See section 3A.9.
5.9
SETTING THE BOILER OPERATING TEM-
PERATURE
The flow outlet temperature can be adjusted
between 40 ºC - 80 ºC 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 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, 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 SYS-
TEM
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 cor-
rect and are approximately equal.
5.12
FINAL CHECKS
●
ENSURE ALL TEST NIPPLES ON THE AP-
PLIANCE GAS VALVE HAVE BEN TIGHT-
ENED 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.
●
CLOSE AND LOCK ENCLOSURE DOOR.
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 lock/unlock the enclo-
sure door, how to isolate the appliance from the
gas, water and electricity supplies and the loca-
tions 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 serv-
iced annually by a competent person.
Fig. 11
Outlet
test nipple