GREE Air-ccoled Closed Control Unit Service Manual
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4. Power Distribution of the Unit
4.1 Power Distribution Diagram
4.1.1 Phase Reversal Protector
（
1
）
Protection conditions: Input terminal of power supply for the protector is phase
reversal;
（
2
）
Result of activation: The complete unit is de-energized and can’t be turned on;
（
3
）
Treatment: Adjust wire sequence of power patch board. Check if the voltage of
three-phase power is normal.
4.1.2 Thermal Overload Relay:
（
1
）
Protection conditions: Current of motor is huge and currents of three phases are not in
balance. There is phase loss.
（
2
）
Result of activation: Overload protection of motor will be shown on wired controller;
（
3
）
Treatment: Check if winding of three phases of compressor is normal. If it's normal,
turn on the unit again and check if the working current of motor is normal.
4.1.3 Thermostat:
（
1
）
Protection conditions:Temperature of controlled parts reaches the set value;
（
2
）
Result of activation: Contact of thermostat is on or off;
