Due to our policy of continuous product innovation, some specications may change without notication.
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Outdoor Unit Functions
BASIC CONTROLS
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
• Avoiding control of high discharge
temperature
Minimum Pulse
Indoor Unit EEV Superheat Fuzzy Logic Subcooling Fuzzy Logic Minimum Pulse
Heating mode does not operate when outside air temperature is >81°F and head pressure is >514 psi.
Normal Operation
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.
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.
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