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DIVA D F
System water pressure adjustment
The filling pressure with system cold, read on the
boiler water gauge (detail 2 - fig. 8), must be approx
1.0 bar. If the system pressure falls below minimum
values, the boiler stops and fault F37 is displayed. Pull
out the filling knob (detail 1 - fig. 8) and turn it counter-
clockwise to return it to the initial value. Always close
it afterwards.
Once the system pressure is restored, the boiler will
1
activate the 300-second air venting cycle, indicated on
the display by Fh.
2
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. 8- 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. 9) 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.
1
fig. 9- Safety valve with drain faucet
46
EN
cod. 3542A640 - Rev. 01 - 03/2023
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