96
ES
PT
GB
4.1
ADJUSTMENT OF
D.H.W. FLOW RATE
To adjust the D.H.W. flow rate, use the flow
rate adjuster (5 fig. 4).
Remember that the flow rates and corre-
sponding temperatures of use of hot water,
given in section 1.3, have been obtained by
positioning the selector of the circulation
pump on the maximum value.
Should there be any reduction in the
D.H.W. flow rate, the filter installed on the
inlet to the divertor valve (3 fig. 4) will
need cleaning.
4.2
GAS VALVE
The boilers are equipped standard with the
SIT 845 SIMGA / HONEYWELL VK 4105M
/ SIEMENS VGU 50 gas valve (fig. 18).
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
o n e t y p e o f g a s s u p p l y ( m e t h a n e ) t o
another (butane or propane), it is permit-
ted to alter the operating pressure.
4.3
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.
19):
– 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.
– Configure the new fuel as indicated in
point 4.3.1
– For calibrating the maximum and mini-
mum gas pressure values, see point
4.3.2.
– 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.
4.3.1
New fuel configuration
For access to the installer's parameters,
press simultaneously keys
and
for
5 seconds (3 fig. 14).
4
USE AND MAINTENANCE
3
4
2
1
5
6
1
2
4
3
5
SIT 845 SIGMA
HONEYWELL VK 4105M
KEY
1
Modulator
2
EV1-EV2 coils
3
Pressure inlet upstream
4
Pressure inlet downstream
5
VENT pressure test point
1
2
3
4
5
SIEMENS VGU 50
Fig. 19
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. 18
TABLE 4
Model
Burner max pressure mbar
Modulator current mA
Burner min pressure mbar
Modulator current mA
G20 (*)
G30
G31
G20 (*) G30
G31
G20 (*)
G30
G31
G20 (*)
G30
G31
25 OF
11.0
27.7
35.7
130
165
165
1.8
4.7
4.7
0
0
0
30 OF
11.1
27.7
35.7
130
165
165
1.9
4.8
4.8
0
0
0
25 OFT
11.0
27.7
35.7
130
165
165
1.8
4.7
4.7
0
0
0
25 BF
11.8
28.5
36.5
130
165
165
2.0
4.8
4.8
0
0
0
30 BF
12.0
28.5
36.5
130
165
165
2.1
5.0
5.0
0
0
0
35 BF
13.7
28.2
36.2
130
165
165
2.2
4.5
4.5
0
0
0
20 BFT
11.0
28.5
36.5
130
165
165
1.9
4.8
4.8
0
0
0
25 BFT
11.8
28.5
36.5
130
165
165
2.0
4.8
4.8
0
0
0
(*) Max. burner pressure is guaranteed only when the supply pressure exceeds the max. burner pressure by at least 3 mbar.
Содержание Murelle 20 BFT
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