Ferroli Domina Oasi F 24 E Technical Manual page 12

Circulator (230v/50Hz)
Located on the heating circuit return, it is connected directly to the exchanger
via special forks and connected to the system via a threaded brass fitting. It has
three delivery/head levels (see diagram). Changing the delivery/head changes
the speed of the water flowing through the boiler exchanger and as a result the
temperature difference (∆T) between heating delivery and return. Clearly,
increasing the delivery of the circulator decreases ∆T and vice versa. If it is not
used for a long time, the impeller might "jam" due to debris in the water. With
the front screw it is possible to access the impeller, which can be freed with the
aid of a screwdriver. The connection to the expansion tank and the air separator
is installed on the pump casing.
Checks
If the pump doesn't work:
• Check that the impeller is free to turn by turning the screw on the front with
a screwdriver.
• Check that both the card and the pump connection are powered.
• If there is no power supply, check the card.
• If there is power, change the pump.
m
6
C.A.
5,5
5
4,5
3
4
3,5
3
2
2,5
2
1
1,5
1
0,5
0
0 0,2 0,4 0,6 0,8 1
Air separator and automatic air vent
This is used to expel the air in the tap-water and heating circuit automatically.
It can be removed by simply unscrewing it from its seat on the air separator. The
function of the latter is to slow down the speed of the water, preventing the air
it contains from getting dragged along.
12
DOMINA OASI F 24 - 30 E
FERELLA BOIL F 24 - 30 MEL
KEA AIR COMPACT E
A
B
1,2 1,4 1,6 1,8 2 2,2 2,4 2,6 2,8 3 3,2 3,4 3,6 3,8
Key
1 - 2 - 3 = Pump selector position
A = Losses of head 24kW version
B = Losses of head 30kW version
m 3 /h
4
Version - 09.2002