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4
USE AND MAINTENANCE
4. 1
PRESSURE CHECK
AT GAS NOZZLES
To measure pressure at the nozzles, con-
nect the pressure gauge as shown in fig.
22.
This connection must also be used to check
maximum and minimum gas pressure, but
if the setting needs to be adjusted, follow
the indications in point 4.3. 1 .
4.2
GAS VALVE (fig. 23)
The gas valve SIT 845 SIGMA is set at two
pressure values: maximum and minimum,
corresponding, according to the type of
gas, to the values indicated in Table 5.
Maximum and minimum gas pressures are
set by SIME on the production line; you are
therefore recommended not to vary the
settings.
Variation in working pressure is allowed
only in the case of a changeover from one
type of gas supply (methane) to a different
type (butane or propane).
4.3
GAS CONVERSION
This operation must be carried out by
authorised personnel and only original
5
4
1
3
6
76
Sime components may be used.
To change from methane gas to LPG and
vice versa, it is necessary to (fig. 24):
– Close the gas tap.
– Slide off the burner manifold (3).
– Replace the main nozzles (6) and the
copper washer (4) with those provided in
the kit; to carry out this operation use a
fixed size 7 spanner.
– Move the connector "MET-LPG" of the
card onto the position corresponding to
the gas used (5 fig. 18).
TABLE 5
Max burner pressure
Gas type
mbar
25 BF TS2
30 BF TS2
G20 (*)
11,8
14,5
G30
28,5
28,2
G31
36,5
36,2
(*) Max burner pressure is guaranteed only when the supply pressure is at least 3 mbar more than max.
burner pressure
2
3
1
4
KEY
1
Modulator
2
2
Coils EV1-EV2
3
Pressure inlet upstream
4
Pressure inlet downstream
5
VENT pressure test point
Modulator
Min burner pressure
current
mbar
mA
25 BF TS2
130
2,0
165
4,8
165
6,3
KEY
1
Pressure inlet downstream
2
VENT pressure test point
3
Sealed chamber
4
Pressure gauge differential
– To set maximum and minimum gas pres-
sure values, adhere to the indications
given in point 4.3. 1 .
– On completion of the operations, apply
the plate indicating the gas adaptation,
provided in the kit, to the mantle.
NOTE: When fitting the components
removed, replace the gas washers and,
after fitting, test the seal of all the gas
connections using soapy water or special
products, avoiding the use of open fla-
mes.
Modulator
current
30 BF TS2
mA
2,5
0
4,7
0
6,0
0
Fig. 22
Fig. 23
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