Pump Down - LG MULTI V IV ARNU07GTU 2 Series Service Manual

4.10 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 )
Press the red button (SW01C)
All IDU cooling operation
pressure target?
Note 2)
*Current low
Low pressure < 229kpa
pressure
IDU, ODU OFF
Power reset after Dip switch off
[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 : 20~32C
ODU : 5~40C
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)
Copyright ©2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Satisfy low
Yes
Pump down completed
Press the red button
(SW01C)
*Current low
pressure
No
Note 1)
*Current low pressure
under 307kPa (blink)
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Function
ODU SVC V/V Setting
Close
Liquid Pipe Gas Pipe
ODU SVC V/V Setting
Close Close
Liquid Pipe Gas Pipe
LGE Internal Use Only
Open