Sanyo TH3642 / CH3642, XH3642 / CH3642 Compressor Current Detection Circuit, Overload Protection

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. Cut-off Range

Overload Protection Range

Normal Operation Range

			0447_M_S
				Fig. 18
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.

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SM830082

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