RAGGIO C
170
EN
cod. 3541V280 - Rev. 01 - 04/2021
System hydraulic pressure manual reset
The filling pressure with system cold, read
on the boiler pressure gauge (detail 2 -
fig. 9), must be approx 1.0 bar. The boiler
stops if the system pressure drops to values
below the minimum. Pull out the filling knob
(detail 1 - fig. 9) and turn it counterclockwise
to return it to the optimal value. Always close
it afterwards.
Once the system pressure is restored, the
boiler will activate the 300-second air ven-
ting cycle, identified on the display with the
appropriate sequence of screens.
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. 9- Filling knob
System semiautomatic pressure restoration (P62 = 0)
In case of low water pressure (indicated by the symbol
), access the pressure control screen
(fig. 8) and press the
"RESTORE” button
.
This activates the filling valve until the pressure returns to the nominal value
(P57)
+0.4 bar.
If the nominal pressure is not reached within a time limit (4 min), a shutdown is generated
(A23)
.
System automatic pressure restoration (P62 = 1)
If the boiler detects a too low system pressure, the filling valve is automatically activated until the
nominal value is reached
(P57)
+0.4 bar.
If the nominal pressure is not reached within a time limit (4 min), a shutdown is generated
(A23)
.
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. 10) counter-clockwise to open the fau-
cet. 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.
fig. 10- Safety valve with drain faucet
2
1
1
