Basic Control; Normal Operation; Compressor Control; Outdoor Unit Functions - LG Multi V5 Service Manual
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Also See for Multi V5:
- Data manual (162 pages) ,
- Manual book (133 pages) ,
- Engineering manual (105 pages)
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Normal Operation
Table 1: Normal Operation Functions.
Component
Compressor
Fan
Main EEV
Subcooling EEV
Indoor Unit EEV
Heating mode does not operate when outside air temperature is >81°F and head pressure is >514 psi.
Compressor Control
Fuzzy logic helps ensure stable system performance by maintaining a constant evaporating temperature (Te) in cooling mode, and a constant
condensing temperature (Tc) in heating mode. Both Te (cooling) and Tc (heating) can be set at various steps in the installation mode.
• Cooling Mode (Te): 35.6~41°F
• Heating Mode (Tc): 116.6~123.8°F
Te and Tc can be determined simultaneously by setting DIP switches.
Figure 1: Fuzzy Logic Diagram.
Fuzzy Logic start
Min. frequency
Stop(0 Hz)
Fuzzy Logic
Cooling Operation
Fuzzy Logic
Fuzzy Logic
Higher: Minimum Pulse
Lower: Fully Open
Fuzzy Logic
Superheat Fuzzy Logic
Figure 2: Inverter Linear Control Chart.
Target
Inverter linear control as cooling and heating load increases
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.
BASIC CONTROL
Normal Operation / Compressor Control
Heating Operation
Fuzzy Logic
Fuzzy Logic
Fuzzy Logic
• Normal: Vapor Injection Control
• Avoiding control of high discharge
temperature
Subcool Fuzzy Logic
(Linear Control)
(Linear Control)
Inverter
Comp 3
Inverter
Inverter
Comp 2
Comp 2
Inverter
Inverter
Comp 1
Comp 1
Cooling and heating load
System Not in Operation
Stop
Stop
Minimum Pulse
Minimum Pulse
Minimum Pulse
Inverter
Comp 4
Inverter
Comp 3
Inverter
Comp 2
Inverter
Comp 1
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Troubleshooting
