Sime MURELLE 25 OF Manual Del Usuario página 95

3.9 FUMES PRESSURE SWITCH
vers. BF-BFT
The pressure switch is calibrated by the
manufacturer at the following values:
5.3 - 6.3 H O for vers. "25 BF - 25 BFT"
2
3.6 - 4.6 H O for vers. "30 BF"
2
4.6 - 5.6 H O for vers. "20 BF - 35 BFT"
2
which can guarantee boiler functioning also
with aspiration and discharge pipes of the
maximum length allowed.
The value of the signal to the pressure swit-
ch is measured by a differential pressure
gauge connected as indicated in fig. 16.
3. 1 0 WATER
FLOW GUAGE
The water flow gauge (8 fig. 4) intervenes,
blocking burner functioning, if it detects
that there is insufficient water circulating in
the primary circuit (< 450 l/h).
To res t ore burner functioning, check
system pressure and the functioning of the
pump and the flow switch, and the cleaning
of the "Aqua Guard Filter System" filter.
3. 1 1 HEAD AVAILABLE
TO SYSTEM
Residual head for the heating system is
shown as a function of rate of flow in the
graph in fig. 17.
To obtain the maximum head available to
the system, turn off the by-pass by turning
the union to the vertical position (fig. 17/a).
600
500
400
300
200
100
0
By-pass on
By-pass inserito
30-35
25
25
200 400 600 800 1000
By-pass off
By-pass escluso
Fig. 16
By-pass inserito By-pass on
By-pass escluso
By-pass off
30-35
1200 1400 1600
PORTATA (l/h)
FLOW RATE (l/h)
Fig. 17
Fig. 17/a
ES
PT
GB
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