97
ES
PT
ENG
3.9
FUMES PRESSURE SWITCH
vers. 25/55 BF - 30/55 BF
(fig. 16)
The pressure switch is calibrated by the
manufacturer at the following values:
5.3 - 6.3 H
2
O for vers.
“25/55 BF”
3.6 - 4.6 H
2
O for vers.
“30/55 BF”
which can guarantee boiler functioning also
with aspiration and discharge pipes of the
maximum length allowed. The value of the
signal to the pressure switch is measured
by a differential pressure gauge connected
as indicated in fig. 16.
3.10
WATER FLOW GUAGE
The water flow gauge (4 figs. 3 - 3/a) inter-
venes, blocking burner functioning, if it
detects that there is insufficient water cir-
culating in the primary circuit and in the
case the pump not functions.
N.B.: when replacing the flow meter valve,
verify that the arrow printed on its body
is pointing in the same direction of the
water flow.
3.11
HEAD AVAILABLE TO SYSTEM
(fig. 17)
Residual head for the heating system is
shown as a function of rate of flow in the
graph in fig. 17. The speed of the modula-
ting pump is set as default (installation
parameter
PAR 13=1
).
Fig. 16
0
200
1400
1200
1000
800
600
400
PORTATA (l/h)
PREV
ALENZA RESIDU
A (mbar)
500
400
100
200
300
Mur
elle 25-30/55
1600
Fig. 17
RESIDU
AL
HEAD (mbar)
FLOW RATE (l/h)
Summary of Contents for MURELLE EV 25/55 BF
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