Radiant RBS 24 Installation And Maintenance Manual - page 20
Installation Manual
CONVERSION OF GAS TYPE
5
10
8
6
7
9
5
11
7
6
8
3
4
1
2
Conversion of the boiler from natural
gas to LPG and viceversa must be
performed by qualified personnel
only. Conversion is performed as
follows:
a.
turn off the main power switch;
b.
close the gas cock;
c.
substitute the jets on the main
burner as follows:
• undo the gas pipe 5 (fig.1) from
the burner manifold using a size
24 spanner;
Fig. 1
• separate the burner manifold 2
from the burner ramps 1 by
undoing the 4 screws 3 using a Philips screwdriver;
• fit new jets 4 to the burner suitable for the type of gas the boiler will run on
using a no. 7 spanner. The jets must be fitted with new gaskets;
• reassemble the entire burner unit. Use the soapy water
• method to check for gas leaks each time gas connections are dismantled and
reassembled;
d.
calibrate the new max. and min. settings for the modulator.
e.
replace the gas setting plate that indicates the type of gas and nominal
pressure for the boiler. When converting the boiler to work with a different
type of gas, remove the existing plate and replace it with the new one
supplied in the conversion kit.
GAS DATA TABLE
models: RBS 24
NATURAL GAS G 20
LIQUID BUTAN GAS G 30
LIQUID PROPANE GAS G 31
Lower Wobbe index (15°C; 1013 mbar)
MJ/Nm
3
45.67 80.58
70.69
Rated feed pressure
mbar
20 30
37
Minimum feed pressure
mbar
17 20
25
Main burner: 12 Jets - Ø jet
mm
1.30 0.77
0.77
Consuption (15°C; 1013 mbar)
m
3
/h
2.71 -
-
Consuption (15°C; 1013 mbar)
kg/h
- 2.019 1.99
GAS DATA
TABLE
Boiler Power Rating
Natural Gas G 20
L.P.G. G30/G31
min.
max.
min.
max
24.000 kcal/h
mbar
1.5
10.4
5
28-30/37
LEGEND
:
1.
GAS VALVE
2.
INLET PRESSURE POINT
3.
OUTLET PRESSURE POINT
4.
GAS PRESSURE ADJUSTAMENT SREW
5.
GAS PIPE
6.
BURNER MANIFOLD
7.
12 RAMP GAS BURNER
8.
INJECTORS
9.
IGNITION ELECTRODES
10.
FLAME IONISATION ELECTRODES
11.
MANIFOLD FIXING SCREW
REGULATING THE GAS PRESSURE
Maximum and minimum modulation pressures.
N.B. The following operations must only be carried out by
authorised personnel and are necessary when the boiler is
converted to run on one type of gas or another or also in cases
where the maximum pressure is not the same as that shown on the
plate.
MAXIMUM GAS PRESSURE DIAGRAMS HEATING POWER
F o r 2 2 K W o u t p u t b o i l e r
(G20 - G30/31)
L.P.G.
NATURAL
GAS
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
0
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
Ga s p r e ssu r e i n m b a r
COMBI – TG05A039.B0305
17