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DOMITOP HF 24 - 30 E
FERELLA GOLD HF 24 - 30 MEL
Version - 09.2002
Hydraulic unit
This is a single piece of brass to which the
exchanger delivery is connected for ease of
access. It accommodates a number of safety
and adjustment components.
The hydraulic unit includes:
- safety valve
- water pressure switch
- heating sensor
- filler cock
- check valve
Safety valve
It opens if the pressure exceeds 3 bars, making boiler operation safer and
protecting it against overpressure. You are strongly recommended not to use
this valve to drain the system; once open, dirt could remain inside it, preventing
it from closing completely.
Check valve
It ensures the filling system flows only in one direction and remains airtight
along with the cock.
Filler cock
The boiler has a 1/2 connection on the right-hand side of the heating delivery
for filling the system. It is not fitted on the boiler for some markets such as the
British and Belgian ones.
Water pressure switch
It ensures a minimum pressure for the system. It is normally open (NO) and
closes the contact when the pressure exceeds 0.5 bar. It works on low voltage.
Supplied by HeatingSpares247.com
