- 29 -
▼
Recovering the refrigerant in the outdoor unit
Before performing any maintenance, make sure that all power supplies have been
cut o
ff
.
Stored energy: after cutting o
ff
the power supplies,
wait for 10 minutes before accessing the internal parts of the equipment.
Perform the following procedures to collect the
refrigerant.
1.
Press the ON/OFF button to the
OFF
position
(mark
3
,
fi
g. 8, page 13
). Disconnect the outdoor
unit’s power supply.
2.
Remove the front panel. Open the power control
box. Then turn
ON
the
DIP SW1
on the interface
board,
3.
Reconnect the power supply. Press
the ON/OFF button to position ON.
(The green and red LEDs start
fl
ashing;
1s on / 1s o
ff
). The outdoor unit begins cooling
operation about 3 minutes after being switched on.
4.
The circulation pump starts.
5.
Close the liquid valve on the outdoor unit
maximum
30 secs after the outdoor unit starts.
6.
Close the gas valve on the outdoor unit when the
pressure is below 0.02 relative bar read on the
Manifold
, or 1-2 minutes after the liquid valve has
been closed, while the outdoor unit continues to
operate.
7.
Disconnect the power supply.
8.
Recovery of the refrigerant is complete.
Notes:
- The pump down operation cannot be activated even
if
DIP SW1
is set to
ON
while the heat pump is in
operation.
- Do not forget to switch
DIP SW1
back to
OFF
after the
pump down operation has been completed.
- Select the heating mode.
- If the pump down operation fails, try the
operation again by turning the machine o
ff
and
opening the “liquid” and “gas” valves. Then after
2-3 minutes, restart the pump down operation.
fi
g. 29 - Location of DIP switches and LEDs
on the hydraulic unit interface board
ON
DIP
SW
Interface Board
LED2
(Green)
LED1
(Red)
Alfea Extensa A.I. R32 / INSTALLATION / 2114 - EN
