Valve Control; Functions - LG Multi V5 Service Manual

HEAT RECOVERY UNIT FUNCTIONS
Basic Control
Normal Operation
Table 50: Normal Operation Functions.
Component
High Pressure Vapor Valve
Low Pressure (Vapor Valve
Liquid Valve
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
Stop or Ventilation
Cooling
Heating
Cooling or Heating
The time of Mode Change Time will differ based on the software version of the heat recovery unit PCB.
Table 52: Valve Control by Mode Change Time.
Operation Mode Mode Change Time
Cooling 0 < Time < 120
Heating
0 < Time < 180
0 < Time < 5
Stop or Ventilation
94
Power On
Close
Open after thirty (30)
seconds
Close
Change Mode
Cooling or Heating
Heating
Cooling
Stop or Ventilation
High Pressure Vapor Valve
Time = 0
Time = 0
Cooling Mode: Close
Heating Mode: Low Pressure
Time = 0
Due to our policy of continuous product innovation, some specifications may change without notification.
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Cooling Operation
Close
Open
Open
Mode Change Time
120 seconds
180 seconds
120 seconds
During Heating: 60 seconds
During Cooling: 0 seconds
Low Pressure Vapor Valve
Keep
Close
Close
Keep
Close
Open
Heating Operation Stop Operation
Open
Close
Close
Balancing Valve
Keep
Close
Open
Keep
Close
Close
Keep
Keep
Keep
Keep
Close
Close
Open
Close
Close
Close
Close
Close
Close