21
CONTROL
4.7.5 Compressor current protection control
This control protects the compressor from abnormally high currents.
Normal operation
Current > Max current
↓ ↑
Current < Max current
Current compressor protection, error code P3 is displayed
Size 2,1 - 3.1 4.1 - 5.1 6.1-7.1-8.1 6.1T-7.1T-8.1T 9.1 10.1 12.1 14.1
Maximum current
18A 19A 30A 14A 28A 28A 28A 28A
When the compressor current rises above the maximum current, the system displays P3 protection and the unit shuts
down.
When the compressor current drops below the maximum current, the compressor enters re-start control.
4.7.6 Voltage protection control
This control protects the unit from abnormally high or abnormally low voltages.
Normal operation
Units 2.1 to 8.1:
voltage ≥ 265V
or voltage ≤ 172V
Units 6.1T to 8.1T:
voltage ≥ 457V
or voltage ≤ 298V
Units 9.1 to 14.1:
voltage ≥ 265V for 30s
or voltage ≤ 172
↓ ↑
Units 2.1 to 8.1:
254V < voltage < 187V
Units 6.1T to 8.1T:
440V < voltage < 312V
Units 9.1 to 14.1:
voltage < 265V for 30s
or voltage ≥ 180V
Compressor voltage protection, error code H7 is displayed
For single-phase unit, when the AC power supply voltage is at or above 265 V for more than 30 seconds, the system
displays H7 protection and the unit shuts down.
When the voltage drops below 265 V for more than 30 seconds, the refrigerant circuit restarts once the compressor
re-start delay has elapsed.
When the voltage is below 172 V, the system displays H7 protection and the unit shuts down.
When the AC voltage rises to more than 180 V, the refrigerant circuit restarts once the compressor re-start delay has
elapsed.
For three-phase unit, when the AC power supply voltage is at or above 457 V for more than 30 seconds, the system
displays H7 protection and the unit shuts down.
When the voltage drops below 440 V for more than 30 seconds, the refrigerant circuit restarts once the compressor
re-start delay has elapsed.
When the voltage is below 298 V, the system displays H7 protection and the unit shuts down.
When the AC voltage rises to more than 312 V, the refrigerant circuit restarts once the compressor re-start delay has
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