Flow Meter - Ferroli Domina F 24-30 E Technical Manual

Flow meter

Located at the cold water inlet, its task is to provide the card with a signal
at a frequency (7 Hz per litre) in direct proportion to the tap-water flow rate.
It is composed of a body (stator) and a rotor inside it. There is a filter on its
inlet to prevent foreign bodies damaging it. It should be remembered that
to turn on the boiler for tap-water operation, the tap-water pressure must
be at least 0.25 bars and the draw flow rate must be greater than 2.5 l/min.
Check
To check it works properly, you need to make sure the flow rate is at least
2.5 l/min and then test the signal to the electric card with a frequency meter.
This makes it possible to understand whether the problem lies with the flow
meter, incorrect contacts, or the card.
Flow-rate restrictor
This is a diaphragm downstream from the flow meter. Its task is to limit the tap-
water flow rate; the boiler modulates its capacity to keep the tap-water
temperature set by the user, but since the boiler capacity is limited to its rated
capacity, it is necessary to limit the tap-water flow rate to obtain high T.
16
Supplied By www.heating spares.co Tel. 0161 620 6677
DOMINA F 24 - 30 E
FERELLA F 24 - 30 MEL
MILOS AIR COMPACT E
In this case, above the flow-
*
rate limit m, even though
the boiler is working at its
rated capacity, it is not able
to maintain the set tempe-
rature of 50°C.
Version - 09.2002