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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.
2
Outdoor Model
GR250R5TAA
GR250R7TAA
GR360R7TAA
GR480R7TAA
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.
Comp. Amps.(A)
Is
1.4
Is
1.17
Is
Rated Current
value
Rated Current Value
ls (A)
24.0
7.1
7.5
10.4
Chart Summary and Explanations
Locked Comp. Cut-off Range
Overload Protection Range
Normal Operation Range
Overload Protection
ls x 1.17 (A)
28.08
8.3
8.8
12.2
44
–
–
0447_M_S
Fig. 18
Locked Compressor Cut-off
Is x 1.4 (A)
33.6
9.9
10.5
14.6
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