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Heat Recovery Unit Functions
Due to our policy of continuous product innovation, some specifications may change without notification.
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HEAT RECOVERY UNIT FUNCTIONS
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Table 53: Oil Return / Defrost Control.
Component Start During Operation Stop
Inverter Compressor Stop 60 Hz 40 Hz
High Pressure Vapor Valve Keep Close Open or Close
Low Pressure Vapor Valve Keep Open Open or Close
Balancing Valve Open for 30 seconds Close Close
Special Control
Liquid Bypass Control
Are the Indoor Units Operating?
Are All the Indoor Units
Operating in Cooling Mode?
Solenoid Valve Open for Liquid
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Low Pressure Vapor Valve).
Yes
No
Subcooling EEV Control
Subcooling EEV operates with fuzzy logic to keep the degree of subcooling (Target: About 77°F) at the outlet of the subcooler during simulta-
neous cooling / heating operation.
Temperature of Subcooler = T Subcooler Outlet – T Subcooler Inlet
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