Si18-201 System control
Main Functions 151
3.27 Cooling Outdoor Unit SC Control
Outline This function controls the subcooling of the outdoor heat exchanger in order to ensure
maximum use of the outdoor heat exchanger capacity.
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Normal cooling operation ... Controls the difference between the high pressure and outside
temperature to the temperature difference most suitable for the heat exchanger capacity.
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Cooling operation under low outside temperature ... Since the fan control alone cannot
maintain appropriate compressor differential pressure, the control function sends surplus
refrigerant to the outdoor heat exchanger in order to reduce the heat exchanger
performance and maintain the high pressure.
When excessive liquid refrigerant is collected in outdoor heat exchanger;
→
Reduction of outdoor heat exchanger performance
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Increase of high pressure
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High pressure saturation temperature rises higher than target high pressure saturation
temperature
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EVL is opened to send surplus refrigerant (subcooled liquid) to receiver
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