Atlantic 024122 - Page 28

3.4.6 Recovering the refrigerant
in the outdoor unit
" Before performing any maintenance, make
sure that all power supplies have been cut o󰀨.
"
Stored energy: after cutting o󰀨 the power
supplies, wait for 1 minute before accessing
the internal parts of the equipment.
Perform the following procedures to collect the
refrigerant.
- 1- Switch the start/stop switch to the 0 position
(mark 3, gure 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. Switch
the start/stop switch to position 1.
(The green and red LEDs start ashing;
1s on / 1s o󰀨). 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󰀨 and
opening the "liquid" and "gas" valves. Then after
2-3 minutes, restart the pump down operation.
gure 24 - Location of DIP switches and LEDs
on the hydraulic unit interface board
DIP SW
Interface Board
LED2
(Green)
LED1
(Red)
OFF
ON
Installation and Operating Manual "1821- EN"
Alféa Extensa Duo A.I. Heat Pump
- 28 -