Pump Down Operation - Samsung AM072BXV Series Service Manual

Troubleshooting
4-4 Case study for trouble shoots (cont.)

4-4-2 Pump down operation

Recover the refrigerant of Indoor Unit and Piping to outdoor side.
The operator need to close liquid service valve and the gas service valve
1. If the installation of the long pipe : Any refrigerant into the outdoor unit can not be recovered, therefore should use a
separate container
Caution
2. Observe low pressure using View Mode of K4 button if compressor operate.
- If low pressure goes down below about
: Immediately close the gas side service valve, then shut down the Pump Out operation
(Pump out operation shut down : K1 button once more press or K3 button one time press)
- If operation of low pressure goes down below
: Pump down operation will be
3. After pump out about 1kg of refrigerant will be remained in the pipe so use pipe cutter to detach the pipe.
(Do not use flame to detach the pipe)
K2 button
■ How to store refrigerant to the separate container.
1. Prepare manifold gage, container, scale.
2. Check total refrigerant in the system.
3. Connect manifold gage hose & Turn on 50% IDUs in cooling mode
4. 10mins later if the high pressure is over 30kg/cm2.g, turn off some indoor unit till high pressure is same or lower than 30kg/cm2.g
5. If high pressure is same or lower than 30kg/cm2.g, open the liquid valve and container valve.
6. Check the weight of container and then close the valve.
* Recommend to store 50% of total refrigerant.
* If too much refrigerant is stored in the container
system can't proceed pump down properly.
Samsung Electronics
manually
0.2MPa.g
0.1MPa.g
stopped automatically to protect the compressor.
How to lnitiate K2 Tact Swithc 3 times
Compressor Address No.1 Outdoor Unit-60Hz (Other Outdoor Unit COMP
OFF)
Indoor Unit Whole Operation (The set temperature=3
4Wasy Valve OFF (Cooling Mode)
Outdoor Fan Maximum air flow
Main EEV Operation side : 2000Step, Stop side : 2000Step
Maximum 30 minutes
Operation Time
Etc. Does not conduct the operation of the special operation, and
protection control.
Pressure and temperature is outside normal limits : Operation is
shut down after gas pipe
manually closed.
o
C)
Scale
153