LG MULTI V 5 Manual Book page 120

■ Detailed information
• This function is used with heat pump and heat recovery.
*Note : The amount of refrigerant that can be pumped out is limited by the amount of refrigerant that
can be stored in the outdoor unit and additional refrigerant storage containers may need to
be used. The maximum amount of refrigerant for Multi V 5 is size dependent and varies be-
tween 14.3 and 37.5 lbs / frame. If the system charge is greater than the volume that can be
stored, a supplemental storage device will be required to totally evacuate the system.
· Use pump down function within guaranteed temperature range.
- IDU : 20~32℃ [68~89.6℉] / ODU : 5~40℃ [41~104℉]
· Make certain that IDU doesn't run with thermo off mode during operation.
· Maximum operation time of pump down function is 30 min. (in case low pressure doesn't go down)
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_TROUBLE SHOOTING GUIDE BOOK
5.2 Pump Out
This function gathers the refrigerant to other ODU and IDU.
Use this function in case of compressor failure, ODU parts defect, leakage.
■ Setting the function
Function
Function
4.12 Pump Out
Pump Out SE 2
This function gathers the refrigerant to other ODU and IDU.
■ Flow Chart
Use this function in case of compressor failure, ODU parts defect, leakage.
Setting method
Close liquid service valve of each unit.
Refer the right side figures of this page
and open the proper valve by each system.
Power reset after Dip switch setting of ODU
Refer to Dip switch setting page
(General case, Inv. Comp failure case)
Press the red button (SW01C)
*Current low
All IDU heating operation
pressure
Satisfy low pressure target?
Note 2)
Yes
Note 1)
*Current low
Low pressure > 229kpa Pump out completed
pressure
Press the red button
(SW01C)
IDU, ODU OFF
Power reset after Dip switch off
[Note]
If low pressure become under 307kPa (blink), close the gas service valve of all ODU immediately.
*Note 1) If low pressure become under 307kPa, close the gas service valve of all ODU immediately.
If low pressure descends below 229 kPa, the system turns off automatically. Close gas service valve immediately.
*Note 2) If low pressure descends below 229 kPa, the system turns off automatically. Close gas service
This function is operating only Heat Pump model.
valve immediately. This function is operating only Heat Pump model.
Caution
1.Use pump out function within guaranteed temperature range
IDU : 10~32℃ [50~89.6℉]
ODU : 5~40℃ [41~104℉]
2. Make certain that IDU doesn't run with thermo off mode during operation
3. Pump out function takes 2~5 min. after compressor start.
Option
Po (display "Low Pressure"), oFF
[Case 1] ODU Service Valve Setting
(for Heat Recovery System)
Close Close Open
Liquid Low pressure High pressure
Pipe Gas Pipe Gas Pipe
[Case 2] ODU Service Valve Setting
(for Heat Pump System)
Close Close Open
No
Liquid No used Gas
Pipe (Keep closed) Pipe
[Case 1] ODU Service Valve Setting
(for Heat Recovery System)
*Current low pressure
Close Close Close
under 307kPa (blink)
Liquid Low pressure High pressure
Pipe Gas Pipe Gas Pipe
[Case2] ODU Service Valve Setting
(for Heat Pump System)
Close Close Close
Liquid No used Gas
Pipe (Keep closed) Pipe
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