Pump Out (Se2, Po) - LG Multi V5 Service Manual

Pump Out (SE2, Po)

The Pump Out function pushes refrigerant from a malfunctioning outdoor unit to other outdoor
units, indoor units, and the building piping system. Use this function if an outdoor unit com-
pressor fails, if a part is defective and needs to be replaced, or if there is a leak. In systems
with short piping systems, the refrigerant amount that can be pumped from the outdoor unit
will be limited, and additional refrigerant storage containers will need to be used. Set Pump
Out mode on the master outdoor unit, but all outdoor units will function while the system is in
Pump Out. For use on both heat pump and heat recovery systems.
Keep the liquid service valves to each
outdoor unit closed. See figures at right for
instructions on which vapor service valve is
Reset power, then turn No. 5 on the master outdoor unit PCB
Choose SE2, Po, and then press the red
Operate the system in all indoor unit heating.
Is the low pressure target satisfied.
Low pressure
>33.2 psi.
Turn all indoor units and outdoor units off.
Turn No. 5 on the master outdoor unit
Reset power.
1. If low pressure falls below 33.2 psi, the system will automatically turn off. Immediately close the vapor service valve of all outdoor units
(Heat Pump systems only). (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 Out function while ambient conditions are within the manufacturer's operating temperature ranges:
Indoor Units = 50~89.6°F; Outdoor Units = 41~104°F.
• Do not run the indoor units in thermo off mode during Pump Out (in case low pressure does not satisfy levels).
• Maximum operation time of Pump Out takes two (2) to five (5) minutes after the compressor starts.
*Current low
pressure
Yes
*Current low Pump down complete.
Close service valves.
pressure
Press the red SW01C
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.
OTHER CONTROLS
Table 40: Setting the Pump Out Function.
Outdoor Unit Service Valves for Heat Recovery
System Pump Out
Closed
Outdoor Unit Service Valves for Heat Pump
System Pump Out
Closed
No
Outdoor Unit Service Valves for Heat Recovery
System After Pump Out Is Complete
*Low pressure <44.5
Closed
Outdoor Unit Service Valves for Heat Pump
System After Pump Out Is Complete
Closed
Setting Optional Modes
Settings Function
oFF (Default) Pump Out is not enabled.
Pump Out is enabled.
Po (on) Display Will Show Low
Pressure.
Open
Closed
Liquid Low Pressure High Pressure
Pipe Vapor Pipe Vapor Pipe
Open
Closed
Liquid Not Used Vapor
Pipe (Keep Closed) Pipe
Closed Closed
Liquid Low Pressure High Pressure
Pipe Vapor Pipe Vapor Pipe
Closed Closed
Liquid Not Used Vapor
Pipe (Keep Closed) Pipe
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