42
3.5. Available pressure head
The boiler is equipped with a high efficiency variable speed circulator.
The circulator speed is managed automatically by the electronics, on the basis of the settings made in the boiler parameters.
The circulator operation modes are two:
1 "ΔT constant” operation
In the ΔT constant operation mode the circulator speed changes automatically to keep fixed the ΔT between the system supply and return
lines to a value set in the boiler parameters.
2 “Fixed speed” operation
In the fixed operation mode the circulator speed remains constant at maximum value.
The circulator is set during production in ΔT constant operation mode.
For a correct operation of the boiler, it is recommended to not change the default settings.
In case the circulator settings must be changed, contact an Authorized Service Centre.
Q
H
0
100 200 300 400 500 600 700 800 900 1000 1100
0
1,0
2,0
3,0
4,0
5,0
6,0
7,0
100%
fig. 15
Play Entry 20
Q
= Flow rate (l/h)
H
= Pressure head available (m.c.a.)
