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MULTI V 5 Outdoor Unit Service Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Pump Down (SE1, Pd)
Pump Down function gathers the refrigerant in the system, and sends it to the outdoor unit.
Use Pump Down function when there is a refrigerant leak, or if an indoor unit needs to be re-
placed. The maximum refrigerant for outdoor units is size dependent and varies between 14.3
and 37.5 lbs per frame. If the system charge is greater than the volume that can be stored,
a supplemental vacuum pump and third-party storage containers will be required. Set Pump
Down mode on the master outdoor unit, but all outdoor units will function while the system is
in Pump Down. For use on both heat pump and heat recovery systems.
Operate the system in all indoor unit cooling.
Choose SE1, Pd, and then press the red
6:&FRQILUPƔEXWWRQ
*Current low
pressure
*Current low
pressure
*Low pressure <44.5
SVLOLJKWZLOOEOLQN
Yes
Low pressure
SVL
Turn all indoor units and outdoor units off.
Pump down complete.
Close service valves.
Press the red SW01C
ƔEXWWRQWRFRQILUP
Is the low pressure target satisfied.
Outdoor Unit Service Valves for Heat Recovery
System Pump Down
Outdoor Unit Service Valves for Heat Pump
System Pump Down
No
Keep the liquid service valves to each
outdoor unit closed. See figures at right for
instructions on which vapor service valve is
WREHRSHQIRUZKLFKV\VWHP
Liquid
Pipe
Closed
Open
Closed
Closed Closed Closed
Closed Closed Closed
Closed
Open
Closed
Low Pressure
Vapor Pipe
High Pressure
Vapor Pipe
Liquid
Pipe
Not Used
(Keep Closed)
Vapor
Pipe
Liquid
Pipe
Not Used
(Keep Closed)
Vapor
Pipe
Liquid
Pipe
Low Pressure
Vapor Pipe
High Pressure
Vapor Pipe
Reset power, then turn No. 5 on the master outdoor unit PCB
',3VZLWFKEDQN6:WR216HOHFWWKH³6Y&´PRGHE\XVLQJ
WKH6:&IRUZDUGŹEXWWRQDQG6:&EDFNZDUGŻEXWWRQV
Turn No. 5 on the master outdoor unit
3&%',3VZLWFKEDQN6:WR2))
Reset power.
Outdoor Unit Service Valves for Heat Recovery
System After Pump Down Is Complete
Outdoor Unit Service Valves for Heat Pump
System After Pump Down Is Complete
1. If low pressure falls below 33.2 psi, the system will automatically turn off. Immediately close the vapor service valves. (See figures
above.)
2. If low pressure falls below 44.5 psi (light will blink), immediately close the vapor service valves of all outdoor units.
• Use the Pump Down function while ambient conditions are within the manufacturer’s operating temperature ranges:
Indoor Units = 68~89.6°F; Outdoor Units = 41~104°F.
• Do not run the indoor units in thermo off mode during Pump Down.
• Maximum operation time of Pump Down is thirty (30) minutes (in case low pressure does not satisfy target levels immediately).
OTHER CONTROLS
Setting Optional Modes
Settings Function
oFF (Default) Pump Down is not enabled.
Pd (on)
Pump Down is enabled.
Display Will Show Low
Pressure.
Table 39: Setting the Pump Down Function.
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