Gas Adjustments; Changing The Type Of Gas - Ariston Contract STI 125 Indirect Installation Instructions Manual

5.

GAS ADJUSTMENTS

CATEGORY II2H3+
Lower Wobbe Index (15°C;1013mbar)
Nominal Delivery Pressure
Minimum Delivery Pressure
10 RFFI
Main Burner: n. 8 jets (ø)
Restrictor
Consumption (15°C; 1013mbar)
Consumption (15°C; 1013mbar)
Gas Burner Pressure:
max - min
[1 mbar = 10,197 mmc.a.]
5.1 C
HANGING THE
T G
YPE OF AS
Supplied By www.heating spares.co Tel. 0161 620 6677
Methane Gas
G20
MJ/m 3 h 45.67
mbar
mbar
mm 1.30
ø
m 3 /h 1.22
Kg/h
mbar
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.
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. Replace the jets on the main burner (see table in section 5);
2. Pay attention to put the gas restrictor if convert the boiler from NG to
GPL and to take it out when pass from LPG to NG;
2. Adjust the maximum and minimum thermal capacity values for the boiler
(see table in section 5);
3. Replace the gas rating plate;
4. Adjust the maximum thermal power setting;
5. Adjust the soft-light feature (open the cover of the regulation screw on the
gas valve (see F
installation requirements).
18
Liquid Butane Gas
G30
80.58
20 29
17 20
0.77
--- 2.9
----
---- 0.91
8.3 22.9
. 5.1). Rotate clockwise from min. to max. as per
IG
F . 5.1
IG
T 5.1
ABLE
Liquid Propane Gas
G31
80.58
37
25
0.77
2.9
----
0.90
29.5