Haier HBU-18CF03 Service Manual page 85

Commercial Air Conditioner
Model: HBU-18CF03
HDU-42CF03/H HPU-42HF03
CN24：low speed control port of indoor fan motor
CN25：netural wire port of indoor fan motor
CN26：netural wire port of swing motor
CN27：control port of outdoor defrost sensor（not available for cooling only type）
CN28：low pressure switch
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