BLUEHELIX TECH RRT H
159EN
cod. 3541C673 - Rev. 00 - 11/2020
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. 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 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
cold. In case of a pressure below 0.8 bar, it is advisa-
ble to restore it.
fig. 16- Filling knob
System draining
The drain faucet ring nut is located under the safety
valve inside the boiler.
To drain the system, turn the ring (ref. 1 - fig. 17) coun-
ter-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.
fig. 17- Safety valve with drain faucet
A
2
1
B
1
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