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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.
HEAT RECOVERY UNIT FUNCTIONS
Basic Control
Normal Operation
Table 50: Normal Operation Functions.
Component Power On Cooling Operation Heating Operation Stop Operation
High Pressure Vapor Valve Close Close Open Keep
Low Pressure (Vapor Valve
Open after thirty (30)
seconds
Open Close Keep
Liquid Valve Close Open Close Close
Start Control (Heating Mode Only)
When the system operates in heating mode, all of the high pressure vapor valves in the heat recovery unit are open.
Valve Control
See Mode Change Time Calculations in the "Mode Change Time Calculation" table. How the valves are controlled by the Mode Change Time
can be seen in the "Valve Control by Mode Change Time" table.
Table 51: Mode Change Time Calculation.
Previous Mode Change Mode Mode Change Time
Stop or Ventilation Cooling or Heating 120 seconds
Cooling Heating 180 seconds
Heating Cooling 120 seconds
Cooling or Heating Stop or Ventilation
During Heating: 60 seconds
During Cooling: 0 seconds
Table 52: Valve Control by Mode Change Time.
Operation Mode Mode Change Time High Pressure Vapor Valve Low Pressure Vapor Valve Balancing Valve
Cooling
7LPH Keep Keep Close
0 < Time < 120 Close Close Open
Time = 0 Close Open Close
Heating
7LPH Keep Keep Close
0 < Time < 180 Close Close Close
Time = 0 Open Close Close
Stop or Ventilation
0 < Time < 5 Cooling Mode: Close Keep Close
Time = 0
Heating Mode: Low Pressure
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Keep Close
The time of Mode Change Time will differ based on the software version of the heat recovery unit PCB.
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