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Outdoor Unit Functions
Due to our policy of continuous product innovation, some specifications may change without notification.
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BASIC CONTROL
Normal Operation / Compressor Control
Table 1: Normal Operation Functions.
Component Cooling Operation Heating Operation System Not in Operation
Compressor Fuzzy Logic Fuzzy Logic Stop
Fan Fuzzy Logic Fuzzy Logic Stop
Main EEV
Higher: Minimum Pulse
Lower: Fully Open
Fuzzy Logic Minimum Pulse
Subcooling EEV Fuzzy Logic
• Normal: Vapor Injection Control
• Avoiding control of high discharge
temperature
Minimum Pulse
Indoor Unit EEV Superheat Fuzzy Logic Subcool Fuzzy Logic Minimum Pulse
Normal Operation
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.
Fuzzy Logic
Stop(0 Hz)
Min. frequency
Fuzzy Logic start
Target
Inverter linear control as cooling and heating load increases
System Capacity
Cooling and heating load
(Linear Control)(Linear Control)
Inverter
Comp 2
Inverter
Comp 1
Inverter
Comp 2
Inverter
Comp 3
Inverter
Comp 1
Inverter
Comp 2
Inverter
Comp 3
Inverter
Comp 4
Inverter
Comp 1
Figure 1: Fuzzy Logic Diagram. Figure 2: Inverter Linear Control Chart.
Heating mode does not operate when outside air temperature is >81°F and head pressure is >514 psi.
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