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OPERATION
18K, 24k and 36k Control Mode
1. Cooling Anti-freeze Protection
To prevent freezing caused by too low temperature of indoor evaporator, the air conditioner will implement real‑time detection
over the indoor coil temperature. If the indoor coil temperature is too low, the compressor will be prohibited from increasing or
decreasing the frequency or shutting down automatically.
2. Heating Overload Protection
To prevent system overload caused by excessive pressure in heating operation, the unit will implement real‑time detection over the
indoor fan‑coil temperature: If the indoor coil temperature rises, the compressor will be prohibited from increasing the frequency;
If the temperature continues to rise, the compressor will decrease the frequency; If the indoor coil temperature is too high, the
compressor will stop working immediately. The compressor then will reboot after the indoor coil temperature reduces.
3. Cooling Overload Protection
To prevent system overload due to excessive pressure during cooling operation, the unit will implement real‑time detection over
the outdoor condenser coil temperature: If the outdoor coil temperature rise, the compressor will be prohibited from increasing
the frequency; If the temperature continues to rise, the compressor will decrease the frequency; If the outdoor fan‑coil temperature
is too high, then the compressor will stop working immediately. The compressor will reboot after the outdoor coil temperature
reduces.
4. Discharge Temperature Protection
To prevent working conditions of compressor from deteriorating due to high discharge temperature, the unit will implement
real‑time detection over the discharge temperature. If the discharge temperature rises, the compressor will be prohibited from
increasing the frequency; if the temperature continues to rise, the compressor will decrease the frequency automatically; if the
discharge temperature is too high, the compressor will stop working immediately. The compressor will then reboot when the
discharge temperature returns to the normal condition.
5. Oil Return Control
When the compressor continues to operate at low frequency, there will be an oil return. The
compressor increases the frequency, and thus returns the oil in refrigerant system to the compressor.
6. Operation Mode
Mode Category
Air conditioning mode is the operation mode set by users through the remote controller. Four modes are available: cooling, heating,
dehumidification, and fan mode.
Mode conflict
The operating mode of outdoor unit is decided by the operating mode of the indoor unit that is booted first. Indoor units
subsequently booted will determine whether it’s own mode is conflict with the outdoor mode. If so, the indoor unit will automatically
shut down after three beeps; If there is no conflict, the indoor unit will boot normally. The relationship of mode conflict is as follows:
√ Mode conflict will not happen
× Mode conflict will happen
Driven choice
Active mode
Cooling
Dehumidification Heating fan
Cooling
√ √
×
√
Dehumidification
√ √
×
√
Heating × ×
√
×
Fan
√
√
×
√
√Mode conflict will not happen
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