Pump Down Operation - Samsung AM080FXWANR 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)
How to lnitiate
Compressor
Indoor Unit
4Wasy Valve
Main EEV
Maximum Operation Time
Etc.
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
0.2MPa.g
stopped automatically
K2 Tact Swithc 3 times
Address No.1 Outdoor Unit-60Hz (Other Outdoor Unit COMP OFF)
Whole Operation (The set temperature=3
OFF (Cooling Mode)
Operation side : 2000Step, Stop side : 2000Step
30 minutes
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.
manually
0.1MPa.g
to protect the compressor.
K2 button
o
C)
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