Sime FORMAT DGT 30e - Head Available to System; Water Pressure Switch

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6.3.8 WATER
PRESSURE
SWITCH
The water pressure switch (C fig. 21)
intervenes,blockingtheboileroperation,
ifitdetectsthatthereisinsufficientpres-
sureintheboiler(<0,6bar).
To restore burner functioning, to bring
backthepressureoftheboileratvalues
comprisebetween1-1,2bar.
6.3.9 HEAD
AVAILABLE
TO SYSTEM
Residualhead fortheheatingsystemis
shownasafunctionofrateofflowinthe
graphinfig.20.
To obtain the maximum head available
to the system, turn off the by-pass by
turningtheadjustertotheverticalposi-
tion(fig.21).
0
200
1600
140012001000800600400
PORTATA (l/h)
PREVALENZA RESIDUA (mbar)
500
400
10 0
200
300
Format DGT
600
By-pass inserito
By-pass escluso
RESIDUALHEAD(mbar)
FLOWRATE(l/h)
Fig.20
A
B
C
RIFERIMENTO POSIZIONE BY-PASS
D
Fig.21
KEY
A By-passon
B By-passoff
C Waterpressurevalve
D Automaticairvent
By-pass on
By-pass off
REFERENCEPOSITIONBY-PASS