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SM830082
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Section
5
2. Processes and functions
2-15 Compressor Current Detection Circuit
❑ The Compressor Current Detection Circuit detects the compressor current and,
depending on the current range, can stop the compressor motor so it will not be
damaged by overcurrent.
❑ Overcurrent can be caused by several factors, particularly mechanical seizing of the
compressor or liquid backflow. Either of these conditions can hold the compressor
to run, and thus drawing so much current that the motor can burn out.
Fig. 18
Locked Comp. Cut-off Range
Overload Protection Range
Normal Operation Range
Comp. Amps.(A)
Is 1.17
Is 1.4
Is
Rated Current
value
+
+
0447_M_S
Outdoor Model
Rated Current Value Overload Protection Locked Compressor Cut-off
ls (A) ls x 1.17 (A) Is x 1.4 (A)
CH2442 17.1 20.0 23.9
CH3642 27.5 32.2 38.5
CH4242 34.7 40.6 48.6
Chart Summary and Explanations
❑ Overload Protection
• When the detected current is 1.17 – 1.4 times greater than the rated current value (Is) and continues
for 30 seconds, both compressor and outdoor fan stop (Thermostat OFF).
• After 3-minute pause, if the air conditioner is ready for Thermostat ON, it starts again. However, if the
condition mentioned above repeats twice within 30 minutes, the remote controller displays the alarm
message H01, compressor overload.
❑ Locked Compressor Cut-off
• When the detected current is 1.4 times greater than the rated current value (ls) and continues for 2
seconds, both compressor and outdoor fan stop (Thermostat OFF).
• After 3-minute pause, if the air conditioner is ready for Thermostat ON, it starts again. However, if the
condition mentioned above repeats twice, the remote controller displays the alarm message H02,
compressor locked.
❑ Failure of Compressor Current Detection
• When the Compressor Current Detection Circuit fails to detect the compressor current within 2
seconds after compressor starts, both compressor and outdoor fan stop (Thermostat OFF).
• After 3-minute pause, if the air conditioner is ready for Thermostat ON, it starts again. However, when
the circuit fails to detect the current twice in a row, the remote controller displays alarm message H03,
Failure of compressor Current Detection.