Ferroli BLUEHELIX 352 RRT 28 C Instructions For Use & Installation page 161

BLUEHELIX PRO RRT 28 C
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 pressure falls below minimum va-
lues, the boiler stops and fault F37 is displayed. Turn
the filling knob (detail 1 - fig. 16) counter-clockwise to
restore the pressure to the initial value. Always close
1
it afterwards.
2
Once the system pressure is restored, the boiler will
activate the 300-second air venting cycle,indicated on
the display by Fh.
To prevent boiler shutdown, it is advisable to periodi-
cally check the pressure on the gauge with system
fig. 16- Filling knob
cold. In case of a pressure below 0.8 bar, it is advisa-
ble to restore it.
System draining
The drain faucet ring nut is located under the safety
valve inside the boiler.
To drain the system, turn the ring nut (ref. 1 - fig. 17)
counter-clockwise to open the faucet. Do not use any
tools; use hands only.
To drain only the water in the boiler, first close the
shut-off valves between the system and boiler before
turning the ring nut.
1
fig. 17- Safety valve with drain faucet
161
EN
cod. 3541Q440 - Rev. 01 - 07/2020