Sanyo 24KHS72 Service Manual - Page 41
CT Peak current cut-off control, Defrost detection and release
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Defrost detection and release Reverse-Cycle Defrosting Defrosting Sequence Heating operation Outdoor fan ON 4-way valve ON Frost sensing Defrost detection occurs in either of the following cases: • The temperature of the heat exchanger remains at or below the L1 line for 3 minutes after the start of HEAT operation. • The temperature of the heat exchanger remains at or below the L2 line for 120 minutes after the start of HEAT operation. Outdoor heat exchanger temp. 0 Ambient temp. L2 L1 Frosting area Reverse-cycle defrosting operation Compressor 1 minute after it is stopped, compressor is ON. Outdoor fan OFF Indoor fan OFF 4-way valve OFF Operation lamp Repeatedly switches between red and orange illumination. Releasing of defrosting Outdoor heating exchanger temp. is over 57.2°F (14°C). Defrosting operation lasts 12 minutes (maximum). 2 minutes after it is stopped, compressor is ON. 4-way valve is ON. Outdoor fan is ON. NOTE If the air conditioner is turned off during the defrosting cycle, it will continue defrosting and turn itself off after defrosting is completed. CT (Peak current cut-off control) • This function prevents the circuit breaker or fuse from operating to open the circuit. This function works when electrical current has increased due to an increase in the cooling / heating load, or to a decrease in the power supply voltage. In these cases, operation frequency is reduced or operation is interrupted automatically to control the electrical current for operation. • When the cause of the increase in electrical current is rectified, the system will resume operation in the original mode. < KHS1872 > (A) Cooling Dry Heating Peak current cut-off trips 22.5 Hz down 14.0 15.0 < KHS2472> Peak current cut-off trips Hz down Cooling Dry 22.5 14.0 (A) Heating 17.5 NOTE Electrical current setting for COOL operation is used during DEFROST operation. 41