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Recovering the refrigerant in the outdoor unit
Before performing any maintenance, make sure that all power supplies have been
cut off .
Stored energy: after cutting off 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. 9, 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 off ). 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 off and
opening the “liquid” and “gas” valves. Then after
2-3 minutes, restart the pump down operation.
fi g. 36 - 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
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