109
ES
PT
ENG
4.1
GAS VALVE (fig. 16)
The boiler is supplied as standard with a
gas valve, model SIT 848 SIGMA (fig. 16).
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
difference 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
for 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
25
ErP
methane (G20) model, SET 1 will be
displayed:
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.
4.2.2
Calibrating the gas valve
pressures
Measure the CO
2
values with a combustion
analyzer.
Sequence of operations:
1)
Press and hold the button down for a
few seconds
.
2)
Press the button for a few seconds
.
3)
Identify the CO
2
values at max. power
by adjusting the shutter (5 fig. 16):
4)
Press the button for a few seconds
.
5)
Identify the CO
2
values at min. power
by adjusting the OFF-SET regulation
screw (6 fig. 16):
6)
Press the buttons several times to
check the pressures
and
change 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
remove 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 pro-
visions in force, it must be regularly che-
cked; the frequency of the checks depends
on the type of appliance and the installa-
tion and usage conditions.
In any case, it should be inspected at least
once a year by a qualified technician.
During maintenance operations, it is
important to verify that the drip-plate
with drain trap contains water (this check
Fig. 16
KEY
1
Upstream pressure intake
2
Intermediate pressure intake
3
Air signal inlet (VENT)
4
Downstream pressure intake
5
Shutter
6
OFF-SET
4
USE AND MAINTENANCE
MAX power
CO
2
(Methane)
CO
2
(Propane)
9,3 ±0,2
10,2 ±0,3
MIN power
CO
2
(Methane)
CO
2
(Propane)
8,4 ±0,2
10,0 ±0,3
1
2
3
4
5
6
1
2
3
3
Fig. 17
GAS
MODELS
PAR 1
25 - 25 T ErP
1
METHANE
30 ErP
2
(G 20)
35 - 35 T ErP
3
25 - 25 T ErP
9
PROPANE
30 ErP
10
(G 31)
35 - 35 T ErP
11
ATTENTION: Before performing any work on the boiler, make sure
that the same and its components have cooled in order to prevent
the risk of burns due to high temperatures.
