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4
USE AND MAINTENANCE
4. 1
GAS CONVERSION (fig. 23)
– Close the gas cock.
– Replace the injector (pos. 30) and
the relevant gasket (pos. 45).
– Test for soundness all the gas
connections using soapy water or
appropriate products.
DO NOT USE NAKED FLAMES.
– Stick onto the casing panel the plate
showing the relevant feeding gas.
– Proceed with air and gas calibration
as described below.
4.2
GAS VALVE (fig.23/a)
The boiler, is equipped standard with the
SIT 848 SIGMA gas valve.
4.2. 1 Calibrating the gas valve
pressures
Measure the CO
values with a combustion
2
analyzer (A).
Sequence of operations:
1) Set the boiler in position "winter" (B)
and set the potentiometer of the hea-
ting to the maximum (C), then remove
the Knob of the heating set point by pul-
ling it out.
2) Turn fully clockwise the trimmer B (D) to
light up the boiler at its maximum heat
output.
3) Identify the CO
values at max. power to
2
be within the values shown on the table
below, if necessary adjust by using the
shutter (5):
MAX power
CO
(Natural gas) CO
(Propane)
2
2
9.5 ±0,3
10.5 ±0,3
4) Turn fully anticlockwise the trimmer B
(D) to reach the boiler minimum output.
5) Identify the CO
values at minimum
2
power to be within the values shown on
the table below, if necessary adjust by
using the OFF-SET (6):
MIN power
CO
(Natural gas) CO
(Propane)
2
2
9.5 ±0,3
10.5 ±0,3
6) Turn fully clockwise the trimmer B to
recheck the CO
values at the maxi-
2
mum power to be within the values
shown on the table below.
MAX power
CO
(Natural gas) CO
(Propane)
2
2
9.5 ±0,3
10.5 ±0,3
28
14
16
106
28
64
57
4
3
2
1
A
C
35
34
29
30
45
65
63
5
KEY
1
Upstream pressure fixture
6
2
Intermediate pressure fixture
3
Air signal intake
4
Downstream pressure fixture
5
Shutter
6
OFF-SET
B
Dise
D
B
ENG
FR
Fig. 23
Fig. 23/a
33
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