Samsung Electronics DVM Series Technical Manual page 220

9-3. Recovery of refrigerant
(1) Close the service valve of liquid side and then press the refrigerant recovery
button on outdoor PCB
(2) When the low pressure is getting low enough, close the service valve and press
the refrigerant recovery button again or press key 3. Pressing the button stops the
compressor.
(3) When total amount of refrigerant in the pipe is more than 33lbs, the refrigerant may
not be recovered completely even though the refrigerant recovery (pump down) is
performed. So care must be taken when opening the system.
(4) The pump down time shall not exceed 5 minutes.
(5) Do not operate until the low-pressure progress to the vacuum state when pump is
down. You should operate while checking pressure after connecting the gauge to
the low-pressure side.
1) Refrigerant recovery button
Press times
1 Heating refrigerant charge
2
3
1) .
Key 1
Cooling refrigerant charge
Heating test operation Cooling test operation
47
Key 2 Key 3
Reset
Pump down
Key 4
View Mode