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Idiomas disponibles
Idiomas disponibles
4
USE AND MAINTENANCE
4. 1
GAS VALVE (fig. 16)
The boiler is supplied as standard with a
gas valve, model SIT 848 SIGMA (Fig. 16).
4
3
2
1
KEY
1
Upstream pressure intake
2
Intermediate pressure intake
3
Air signal inlet (VENT)
4
Downstream pressure intake
5
Capacity step
6
OFF-SET
4.2
GAS CONVERSION (fig. 17)
This operation must be performed by
authorised personnel using original Sime
components.
To convert from natural gas to LPG or vice
versa, perform the following operations
–Close the gas cock.
–Replace the two differential nozzles (1-2)
and relative seal o-rings (3) with those
supplied in the transformation kit. The dif-
ference in the shape of the head of the
nozzles, avoid reversal during assembly.
–Apply the nameplate with the new gas
flow layout.
–Calibrate the maximum and minimum
pressures of the gas valve following the
instructions provided in paragraph 4.2.2.
4.2. 1
New fuel configuration
For access to the installer's parameters,
press simultaneously keys
and
5 seconds (3 fig. 12).
The parameters will scroll up and down
with the keys
and
.
The display pane will show the values of the
parameter PAR 1. If the boiler is a vers. 25
me t hane (G20) model, SET 3 will be
displayed:
WARNING: The vers. 12T
does not include the posi-
tions 2 and 3 shown in the
figure.
5
6
Fig. 16
To change the fuel to propane (G31), it is
necessary to set SET 9, by pressing the key
.
The standard display will automatically
return after 10 seconds.
The table below shows the SET settings to
enter when the type of gas fuel is changed.
GAS
METHANE
(G20)
for
PROPANE
(G31)
4.2.2
Calibrating the gas valve
pressures
Measure the CO
analyzer.
Sequence of operations:
3
1
2
MODELS
PAR 1
12 T
1
20 T
2
25 - 25 T
3
30 - 30 T
4
35 - 35 T
5
12 T
6
20 T
7
-
8
25 - 25 T
9
-
10
30 - 30 T
11
35 - 35 T
12
values with a combustion
2
3
1) Press and hold the button down for a
.
few seconds
2) Press the button for a few seconds
3) Identify the CO
values at max. power by
2
adjusting the shutter (5 fig. 16):
MAX power
CO
(Methane)
CO
(Propane)
2
2
9,0 ±0,3
10,0 ±0,3
4) Press the button for a few seconds
5) Identify the CO
values at min. power by
2
adjusting the OFF-SET regulation screw
(6 fig. 16):
MIN power
CO
(Methane)
CO
(Propane)
2
2
9,0 ±0,3
10,0 ±0,3
6) Press the buttons several times to
check the pressures
and
ge them if required.
7) Press the button
once more to quit
the function.
4.4
DISASSEMBLING
THE SHELL
(fig. 19)
To simplify maintenance operations on the
boiler, it is also possible to completely remo-
ve the shell, as shown in figure 19.
Turn the control panel to move it forward
and be able to access the internal compo-
nents of the boiler.
ES
PT
ENG
Fig. 17
.
.
chan-
101
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