Sime FORMAT DGT 25/15 BF Manual De Instrucciones página 77

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).
NOTE: The expansion vessel supplied with
the boiler is suitable for heating systems
with a maximum water capacity of 80
litres. In excess of such capacity, arrange
for an additional expansion vessel.
3. 1 0 WATER PRESSURE VALVE
(fig. 17/a)
The water pressure valve (C fig. 17/a)
intervenes, blocking burner functioning, if it
detects that there is insufficient pressure
in the boiler (< 0,9 bar).
To restore burner functioning, to bring back
the pressure of the boiler at values compri-
se between 1 - 1,2 bar.
SEALED CHAMBER
CAMERA STAGNA
(--)
(+)
PRESSURE SWITCH
PRESSOSTATO
600
500
400
300
200
100
0
200 400 600
C
VENTILATORE FAN
By-pass on By-pass inserito
By-pass off
By-pass escluso
800 1000 1200 1400 1600
FLOW RATE (l/h)
PORTATA (l/h)
REFERENCE POSITION BY-PASS
A RIFERIMENTO POSIZIONE BY-PASS
Fig. 16
Fig. 17
LEGENDA
A By-pass on
B By-pass off
C Water pressure valve
B
Fig. 17/a
77
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PT
ENG