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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.
Comp. Amps.(A)
Is | + | 1.4 |
Is | + | 1.17 |
Is
Rated Current value
Locked Comp.
Overload Protection Range
Normal Operation Range
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| 0447_M_S | |
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| Fig. 18 |
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Outdoor Model | Rated Current Value | Overload Protection |
| Locked Compressor |
ls (A) | ls x 1.17 (A) |
| Is x 1.4 (A) | |
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CH2442 | 17.1 | 20.0 |
| 23.9 |
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CH3642 | 27.5 | 32.2 |
| 38.5 |
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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
❑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
❑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
Failure of compressor Current Detection.
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SM830082
II - 17