Basic Controls; Normal Operation / Compressor Control - LG MULTI V ARUN072BTE4 Service Manual

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 evaporating temperatures (Te) in cooling mode, and condensing tem-
peratures (Tc) in heating mode. Both cooling and heating modes can be determined at various steps in the installation mode.
• Te: 36~41°F
• Tc: 117~124°F
Te and Tc can be simultaneously determined 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.
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BASIC CONTROLS

Normal Operation / Compressor Control

Heating Operation
Fuzzy Logic
Fuzzy Logic
Fuzzy Logic
• Normal: Vapor injection
• Avoiding control of high discharge
temperature
Subcooling 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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