Gas Valve; Gas Conversion - Sime FORMAT.zip 4 25 OF Manual Del Instalacion

IT
ES
PT
GB
3
GR
4
RO
RUS
SIT 845 SIGMA
5
4
1
3
KEY
6
1 Modulator
2 EV1-EV2 coils
3 Pressure inlet upstream
4 Pressure inlet downstream
5 VENT pressure test point
TABLE 4
Type of gas
G20 *
G30
G31
(*) Max. burner pressure is guaranteed only when the supply pressure exceeds the max. burner
pressure by at least 3 mbar.
82
2
1 KEY
1
2
3
4
2
5
2
Burner max. pressure Modulator
mbar current
"25 OF" "25 BF" mA
11, 1 11,8 130
27,7 28,5 165
35,7 36,5 165
Pressure inlet downstreamr
VENT pressure test point
Sealed chamber
Manometer
Fig. 20
HONEYWELL VK 4105M
1 2
4 3
SIEMENS VGU 50
1
3 4 5
Burner min. pressure Modulator
mbar current
"25 OF" "25 BF" mA
2,2 2,3 0
5,0 5,9 0
6,4 7,7 0
Fig. 21
KEY
1 Swivel connection 1/2"
2 Locknut 1/2"
3 Burner manifold
4 Washer ø 6. 1
5 Burners
6 Nozzle M6
7 Screw
WARNING: To ensure a perfect seal,
always use the washer (4) supplied
in the kit when replacing nozzles,
even in burner units for which it is
not specified.
Fig. 22
ter as shown in figure 20. This connection
must also be used when checking maxi-
mum and minimum gas pressure; refer to
the directions provided under point 4.5. 1 if
you need to correct the settings.
4.4

GAS VALVE

The boilers are equipped standard with the
SIT 845 SIMGA/HONEYWELL VK 4105M
/SIEMENS VGU 50 gas valve (fig. 21).
The gas valve is set at two pressure values:
maximum and minimum.
According to the type of gas burnt, these
correspond to the values given in Table 4.
The gas pressures at the maximum and
minimum values, are factory set. Conse-
quently they must not be altered.
Only when you switch the appliance from
one type of gas suppl y (me t hane) t o
another (butane or propane), it is permit-
ted to alter the operating pressure.
4.5

GAS CONVERSION

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 (fig. 22):
– Close the gas cock.
– Disassemble the burner manifold (3).
– Replace the main nozzles (6) supplied in
a kit, inserting the copper washer (4).
Use a ø 7 spanner to perform this ope-
ration.
– Remove the "METANO/GPL" connector
link on the card and set it in the posi-
tion corresponding to the gas to be
used (4 fig. 15).
– To set the values of maximum and mini-
mum gas pressure, follow the instruc-
tions given in section 4.5. 1 .
– After have ultimated the conversion of
the boiler, please stick onto the casing
panel the plate showing the relevant fee-
ding gas which is included into the kit.
NOTE: When reassembling components
which you have removed, replace gas
seals; test all gas connections after
assembly using soapy water or a product
made specifically for the purpose, being
sure not to use open flame.
4.5. 1 Adjusting valve pressure
Set maximum and minimum pressure on
gas valves as follows (fig. 22/a):
– Connect the column or a manometer to
the intake downstream of the gas valve.
In "25 BF" models, disconnect the valve
VENT pressure test point tube (5 fig. 21).
– Remove the cap (1) from the modulator.
– Place the hot tap water potentiometer
knob at the maximum position.
– Turn on the boiler using the four-way
switch and turn on a hot water tap all