points. The electrode is connected to
the earth or badly worn and must be
replaced. The electronic board is faulty.
In the case of a sudden lack of voltage, the
burner will immediately switch off. When
voltage returns, the boiler will automatically
700
600
500
400
300
200
100
0
92
start up again.
3.8
HEAD AVAILABLE TO SYSTEM
(fig. 14)
Residual head for the heating system is
500
1000
Flow
FIXED
POMPA
Portata
rate
PUMP
FISSA
(l/h)
(l/h)
(mbar)
(mbar)
0
633
200
621
400
600
600
567
800
524
1000
478
1200
417
1400
345
1600
266
1800
173
2000
78
shown as a function of rate of flow in the
graph in fig. 14.
The speed of the modulating pump system
is set as default (installation parameter
PAR 13 = - - ).
POMPA MODULANTE
VARIABLE SPEED
A VELOCITA' VARIABILE (M)
MODULATING PUMP (M)
POMPA FISSA
FIXED PUMP
1500
2000
VARIABLE SPEED
POMPA MODULANTE A
MODULATING PUMP (M)
VELOCITA VARIABILE (M)
(mbar)
(mbar)
648
639
623
601
568
528
482
429
367
300
217
2500
3000
PORTATA (l/h)
FLOW RATE (l/h)
Fig. 14