VOKERA RAIN 24 Installation And Servicing Instructions - page 27
25
24/28/bi
24/28/bi
24/28/bi
24/28/bi
24/28/bi
SECTION 10
L.P.G. INSTRUCTIONS
10.2
GAS SUPPLY
The gas supply must be connected to the appli-
ance by a competent LPG installer and must be
of sufficient size to supply the appliance at its
maximum output.
An existing supply must be checked to ensure
that it is of adequate size to deal with the maxi-
mum rated input of this and any other appliances
that it serves.
10.3
GAS SUPPLY INSTALLATION
The entire installation including the meter must
be purged and checked for gas soundness.
10.4
CHECKING AND ADJUSTING BURNER PRES-
SURE (see fig. 21)
Although the burner pressure is factory set, it is
necessary to check it during servicing or if the gas
valve has been removed.
Isolate the appliance from the electrical supply
and attach a suitable manometer to the gas valve
outlet test nipple. Remove the compensator tube.
10.4.1 SETTING THE MAXIMUM BURNER PRES-
SURE
Light the boiler as described in 5.6 and compare
the reading on the manometer with the value
described in 10.1. If adjustment is required, re-
move the protective cap from the gas valve
modulating coil assembly and turn the outer
(10mm) nut clockwise to increase, or counter-
clockwise to decrease the burner pressure.
NOTE
You should ensure that all radiators or heat emit-
ters are fully open during the above procedure.
This will ensure that the output of the boiler
(burner pressure) is not compromised due to a
high flow temperature.
10.1
TECHNICAL DATA
GAS PRESSURES
24-24 bi
28-28 bi
Inlet gas pressure
37 mbar
37 mbar
Burner pressure maximum
36.00 mbar
36.00 mbar
Burner pressure minimum
7.30 mbar
6.80 mbar
Maximum gas rate
2.04 kg/h
2.37 kg/h
Minimum gas rate
0.87 kg/h
0.99 kg/h
Injectot size (quantity)
12 x 0.77
13 x 0.78
NOx (max - min) PPM
160 - 110
180 - 120
CO (max - min) PPM
80 - 140
70 - 150
CO
2
(%)
8.10 - 3.10
7.65 - 2.90
CO/CO
2
ratio (max - min)
0.0009 to 1 - 0.0045 to 1
0.0009 to 1 - 0.0051 to 1
10.4.2 SETTING THE MINIMUM BURNER PRESSURE
Once the maximum burner pressure has been
checked and/or adjusted, remove one of the grey
wires from the modulating coil. Compare the
reading on the manometer with the value de-
scribed in 10.1. If adjustment is required, turn the
inner (red) cross-head screw clockwise to in-
crease, or counter-clockwise to decrease the
burner pressure, whilst ensuring that the outer
(10mm) nut does not move. When checking and/
or adjustment has been completed, isolate the
appliance from the electrical supply, replace the
protective cap, refit the compensator tube, refit
the grey wire to the modulating coil, remove the
manometer and tighten the outlet test nipple.
IMPORTANT, A GAS SOUNDNESS CHECK
MUST BE CARRIED OUT.
For details of converting boilers to LPG please refer to the instructions supplied with the relevant conversion kit.