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4
USE AND MAINTENANCE
4. 1
GAS VALVE (fig. 17)
The boiler is supplied as standard with a
gas valve, model SIT 848 SIGMA.
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
4.3
GAS CONVERSION (fig. 18)
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 4.3.2.
4.3. 1
New fuel configuration
Access the parameters section by pres-
sing the control panel keys (
the same time for 5 seconds.
The red LED flashes and the display shows:
Scroll the parameters using
To enter the fuel configuration paramater
PAR 01, use
or
.
The set value flashes and if the boiler in
question is a BRAVA DGT HE 30 with
methane, the display shows:
110
WARNING: The vers. 12T
does not include the posi-
tions 2 and 3 shown in the
figure.
5
6
Fig. 17
For the BRAVA DGT HE 30 boiler to func-
tion with LPG, press
Confirm this value using
Exit the parameters section by pressing
The table below gives the values to set
when the supply gas is changed:
GAS
METHANE
(G20)
PROPANE
(G31)
4.3.2
Calibrating
and
) at
the gas valve
pressures
Measure the CO
analyzer.
Sequence of operations:
or
.
1) Press buttons
time for 5 seconds.
(Lo) will appear on the display and the
boiler will work at minimum power.
2) Press button
maximum power (Hi) .
3) Search for CO
ted below by acting on the capacity step
(5 fig. 17):
3
1
2
until 05 appears.
or
.
.
MODELS
PAR 1
25
01
30
02
35
03
12 T
07
25
04
30
05
35
06
12 T
08
values with a combustion
2
and
at the same
to raise the boiler to
values at max power sta-
2
3
MAX power
Boiler
CO
2
model
(Methane)
(Propane)
12 T
9.2 ±0,3
10. 1 ±0,3
25-30-35
9.0 ±0,3
10,0 ±0,3
4) Press button
to bring the boiler to
minimum power (Lo).
5) Search for CO
values at min power sta-
2
ted below by acting on the OFF-SET adju-
stment screw (6 fig. 17):
MIN power
Boiler
CO
2
model
(Methane)
(Propane)
12 T
9.2 ±0,3
10. 1 ±0,3
25-30-35
9.0 ±0,3
10.0 ±0,3
6) Press buttons
and
several times
to verify the pressures; if necessary,
make the appropriate corrections.
7) Press button
to exit 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.
4.5
MAINTENANCE (fig. 20)
To guarantee functioning and efficiency of
the appliance, in respect of the legal provi-
sions in force, it must be regularly checked;
the frequency of the checks depends on
Fig. 18
CO
2
CO
2
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