5. PROTECTION FUNCTION
5.1 Symbol & Meaning
TA: Indoor ambient temperature;
TE: Indoor evaporator temperature;
TS: Setting temperature through the remote controller.
5.2 Protection Function
3 minute compressor time delay
The compressor will wait for 3 minutes before restarting, so as to prevent the pressure
imbalance in refrigerant system from resulting in compressor rotor locking.
Anti-freezing protection in cooling or dry mode
Anti-freezing function is activated according to TE.
If TE is lower than 33.8°F (1℃) for 14 minutes, the evaporator anti-freezing protection will be
activated. The compressor will turn off for 5 minutes. 5 minutes later, if the evaporator pipe
temperature is still lower than 33.8°F (1℃), the compressor remain off; when it gets higher
than 33.8°F (1℃), the compressor will restart and the antifreeze function will be cancelled.
Note: If the compressor stops operation, the time will be cleared.
If the fan motor turns to High speed or the indoor ambient temperature gets over 78.8°F
(26℃), the time will keep inactive, not be cleared.
Anti-frosting protection and defect at cooling or dry mode
After compressor runs for 3 minutes, if TE is less than 5°F (-15℃) for the subsequent 3
minutes, the anti-frosting protection will be activated and the compressor will stop for the
following 6 minutes. After that time, if the condition for de-frosting function is met again in the
following 10 minutes while the compressor is operating, the unit will display ‘Ed’ to indicate that
the unit is in the defrost mode defect. The compressor and fan motor will turn OFF
Note: The Defect display can be cancelled only by pressing the ON/OFF button on the unit
or the remote controller.
Service Manual
Room Air Conditioner with R-410A
Heat Controller, Inc.
8