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Only training and service purposes.
4.2 Pump Down
This function gathers the refrigerant present in the system to ODU
Use this function to store refrigerant of system in ODU for leakage or IDU replacement.
Close liquid SVC v/v of each unit.
Open gas SVC v/v of each unit.
Power Reset after Master Unit
Dip switch setting (Refer to Dip switch setting page )
All IDU cooling operation
Press the red button (SW01C)
*Current low
pressure
*Current low
pressure
*Current low pressure
under 307kPa (blink)
Note 1)
Note 2)
Yes
Low pressure < 229kpa
IDU, ODU OFF
Power reset after Dip switch off
Pump down completed
Press the red button
(SW01C)
Satisfy low
pressure target?
ODU SVC V/V Setting
ODU SVC V/V Setting
[Note]
If low pressure become under 307kPa (blink), close the gas SVC V/V of all ODU immediately.
If low pressure descends below 229 kPa, the system turns off automatically. Close the gas SVC V/V immediately.
Caution
1.Use pump down function within guaranteed temperature range
IDU : 20~32 °C
ODU : 5~40 °C
2. Make certain that IDU doesn't run with thermo off mode during operation
3. Maximum operation time of pump down function is 30 min.
(In case low pressure doesn't go down)
No
Close
Liquid Pipe
Gas Pipe
Open
Close
Close
Liquid Pipe
Gas Pipe
Function
