Cooling Overload Control (Cool); Heating Overload Control (Heat); Extreme Low Temperature Compressor Low Pressure Protection Control (Heat) - Panasonic CU-4E23JBE Service Manual

13.5. Cooling overload control (Cool)

• This control detect outdoor pipe temperature and perform the compressor frequency restriction during cooling operation.

13.6. Heating overload control (Heat)

• This control detect indoor pipe temperature and perform the compressor frequency restriction during heating operation.
• This control detect outdoor ambient temperature and perform the fan speed adjustment during heating operation.
13.7. Extreme Low Temperature Compressor low pressure protection control
(Heat)
• This control is to prevent low pressure drops too low during extremely low outdoor ambient temperature to improve the
compressor reliability.
• During heating operation, when outdoor ambient temperature is in Zone 1, this control will be activated. Compressor frequency
restriction will be based on outdoor piping temperature.
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