Samsung Electronics
68
Troubleshooting
4-2 Service Operation (cont.)
4-2-1 Special Operation (cont.)
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Cooling Pump Down
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Recover the refrigerant of Indoor Unit and Piping to outdoor side.
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Liquid pipe service valve and the gas pipe service valve operation, the operator manually need to close.
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If the installation of the long pipe : Any refrigerant into the outdoor unit can not be recovered, therefore should use a separate container.
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Observe low pressure using View Mode of K4 button if compressor operate.
If low pressure goes down below about 0.2 MPa.g : Immediately lock the gas side service valve, Pump Out operation is shut down.
(Pump out operation shut down : K1 button once more press or K3 button one time press)
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If operation of low pressure goes down below 0.1 MPa.g : Will be stopped automatically for the protection of the compressor.
How to Initiate
K2 Tact Switch 3 times
Compressor
Address No.1 Outdoor Unit- 60Hz (Other Outdoor Unit COMP OFF)
Indoor Unit
Whole Operation (The set temperature=3°C)
4Way Valve
OFF (Cooling Mode)
Outdoor Fan
Maximum air flow
Main EEV
Operation side : 2000 Step , Stop side : 2000 step
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.
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Vacuum Operation
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Operation to facilitate vacuum to open the valve after the Outdoor Unit repair.
How to Initiate
K1 Tact Switch 7 times~10 times
K1 Tact Switch 11 times
Compressor
OFF
Indoor Unit/Outdoor Fan
OFF
4Way Valve
OFF
Valves
Open all valves of the outdoor unit
Open all valves of the system
(Including indoor unit and mcu)
Etc.
If not turn off the vacuum mode, the start of normal operation is prohibited.
