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Technical Information
2.3 Discharge Protection Function
• When the discharge temperature is low, the compressor raises the operational frequency. When the discharge
temperature is high, the compressor frequency is restricted or lowers the operational frequency; when the
discharge temperature is too high, the compressor protection stops running.
• If the discharge temperature protection continuously runs for 6 cycles, the compressor will shut down and fail
to run. The compressor will be able to run after cutting off power to the unit and restoring it after the capacitors
have been effectively rid of any residual charge. If the running time of the compressor is longer than 7 minutes,
the protection time record will be cleared.
2.4 Communication Malfunction
• If the outdoor unit does not receive communication from the indoor unit after 3 minutes of being powered-up,
the outdoor unit will infer that the indoor unit is not installed and will power down.
2.5 Overcurrent Protection
• Overcurrent protection of complete unit, phase wire protection, and compressor phase current protection.
2.6 Compressor High-Pressure Protection
• If the high-pressure switch is isolated for 3 seconds, the compressor will enter high-pressure protection mode
and will come to a complete stop. Simultaneously, the outdoor unit will send the signal – high pressure protection
engaged – to the indoor unit(s).
• Once high pressure protection mode has been engaged, the high pressure switch will be closed for 6 seconds and
the compressor will resume running after the power has been cutoff and restored.
2.7 Compressor Overload Protection
• When the compressor overload switch detects movement, the indoor unit will display malfunction and it will stop
the indoor unit from reaching the set temperature. When the compressor stops for more than 3 minutes and
the overload switch is reset, the unit will resume normal operating status automatically. If overload protection is
activated more than 6 times, the unit will fail to resume normal operation. It will only resume running after the
power has been cutoff and restored.
2.8 Compressor Phase-Lacking Protection
• If one of three phases is detected as open during power up of the compressor, the compressor will enter phase
lacking protection. The malfunction will automatically clear after 1 minute, the unit will restart and then attempt
to detect is phase lacking protection is still needed. If phase lacking protection is detected 6 times, the
compressor will not restart but will be able to run after power has been cutoff and restored. At this point, if the
run time of the compressor is 7 minutes without interruption, the protection record will be cleared and the system
will run under normal conditions.
2.9 IMP Protection
• When the IMP module protection is detected, the outdoor unit will stop the indoor unit from reaching the set
temperature. After the compressor has stopped for 3 minutes, the unit will resume normal operational status
automatically. If the IMP protection occurs more than 6 times, the system will completely stop and the send the
signal of module protection to the indoor unit. The unit cannot resume operational status automatically, it will
only resume running after the power has been cutoff and restored.
