4.1
GAS VALVE
Each single module is mass produced
with gas valve model SIT 848 SIGMA
(fig. 18).
4.2
SINGLE MODULE HEAT
POWER ADJUSTMENT
To adjust heating power by changing the
58 kW factory setting, use a screwdriver
on the heat power trimmer (10 fig. 15).
To increase operating pressure, rotate the
trimmer clockwise, to reduce it, rotate the
trimmer counter-clockwise.
Boiler power settings can be checked by
observing the “
∆
p air” can be measured
with a digital pressure gauge connected as
indicated in fig. 19.
The resulting values must correspond to
those shown in the chart of Figure 19/a.
80
4
USE AND MAINTENANCE
1
2
3
4
5
6
Fig. 18
KEY
1
Upstream pressure fixture
2
Intermediate pressure fixture
3
Air signal intake
4
Downstream pressure fixture
5 Shutter
6 OFF-SET
2
4
5
3
7
6
1
8
KEY
1
Gas valve
2
Air pressure switch
3
Fan socket (+)
4 Mixer
intake
(–)
5 Nozzle
6
Digital pressure gauge
7
Air signal intake
8 Air/gas
mixer
Fig. 19
40
30
20
10
0
10
20
Potenza kW
∆
p ar
ia mmH
2
O
50
60
0
70
80
30
40
50
60
70
G20/G25
G31
5,8
17
56,5
10,9
22,6
63
Fig. 19/a
∆
p
air mmH
2
O
Heating power (kW)
Summary of Contents for DEWY EQUIPE 120 BOX
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