Technical information

41
O
nce the gas pressure is set turn off the boiler and re-
c
onnect the detection electrode.
NB.: It may be necessary to reset the flame failure reset
a number of times during this operation.
Remove the pipe from the test point and tighten the
screw “
C” to the pressure test point in order to seal off
the gas. Carefully check the pressure test points for gas
l
eaks (valve inlet and outlet), reconnect the
c
ompensation pipe
D
1
.
IMPORTANT!
Whenever you disassemble and reassemble the gas
connections, always check for leaks using a leak
detection fluid.
NOTE: ALWAYS CHECK THE GAS RATES FOLLOWING
A
DJUSTMENT
.
Natural gas G20 Butane L.P.G. G30 Propane L.P.G. G31
Gas rate max.................................................... 3.52 m
3
/h 2.63 kg/h 2.58 kg/h
Gas rate min..................................................... 1.2 m
3
/h 0.89 kg/h 0.88 kg/h
Nominal inlet pressure ..................................... 20 mbar 28 mbar 37 mbar
Burner injector diameter
................................... 1.23 mm
0.74 mm 0.74 mm
Gas valve restrictor diameter ........................... 9.0 mm 9.0 mm 9.0 mm
16.1 Changing the Type
of Gas
The boiler can be converted to use either methane (natural) gas
(G20) or LPG (G30 - G31) by an Authorised Service Centre.
The operations that must be performed are the following:
1. Adjust the maximum and minimum thermal capacity values for the
boiler (see table below).
Minimum Pressure Nominal Pressure
G20 G30-G31 G20 G30-G31
2.7 12.5 12.5 27.9
(1 mbar = 10.197mm column of water)
The outlet pressure of the gas cock is obtained by completely loosening the screw on the solenoid. The maximum pressure of the gas
to the burner will be equal to the nominal delivery pressure minus the head loss within the gas valve.
Genus 30 Plus
M
aximum Heating Circuit Power
Gas : G20 PROPANE BUTANE
O
utput Inlet Inlet Inlet
(kW) Pressure Pressure Pressure
(
mbar) (mbar) (mbar)
8 0.7 7.1 5.6
12 1.6 15.3 11.5
16 2.8 21.7 15.2
20 4.4 29.5 21.3
24 6.3 30.2 23.5
28 8.6