BlueHelix ALPHA C
282
EN
cod. 3541U152 - Rev. 01 - 04/2021
System water pressure adjustment
The filling pressure read on the boiler water
gauge (detail 2 - fig. 16) with system cold
must be approx 1.0 bar. If the system pres-
sure falls below minimum values, the boiler
stops and fault
F37
is displayed. Pull out the
filling knob (detail 1 - fig. 16) and turn it anti-
clockwise to return it to the initial value.
Always close it afterwards.
Once the system pressure is restored, the
boiler will activate the 300-second air ven-
ting cycle indicated on the display by
Fh
.
To prevent boiler shutdown, it is advisable to
periodically check the pressure on the gau-
ge with system cold. In case of a pressure
below 0.8 bar, it is advisable to restore it.
fig. 16- Filling knob
System draining
The drain cock ring nut is located under the
safety valve inside the boiler.
To drain the system, turn the ring nut (ref. 3
- fig. 17) counter-clockwise to open the
cock. Do not use any tools; use hands only.
To drain only the water in the boiler, first clo-
se the shut-off valves between the system
and boiler before turning the ring nut.
fig. 17
3
