Troubleshooting
Samsung Electronics
153
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
manually
Caution
1. If the installation of the long pipe : Any refrigerant into the outdoor unit can not be recovered, therefore should use a
separate container
2. Observe low pressure using View Mode of K4 button if compressor operate.
- If low pressure goes down below about
0.2MPa.g
: 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
0.1MPa.g
: Pump down operation will be
stopped automatically
to protect the compressor.
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
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
o
C)
4Wasy Valve
OFF (Cooling Mode)
Outdoor Fan
Maximum air flow
Main EEV
Operation side : 2000Step, Stop side : 2000Step
Maximum
Operation Time
30 minutes
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.
4-4 Case study for trouble shoots (cont.)
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.
Scale
