Hisense 2AMW-42U4RRA, Technical & Service Manual, Page: 52 / 80

12. CONTROL MODE
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12. 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 the frequency or decrease the frequency even
shut down automatically
2) Heating Overload Protection
To prevent system overload caused by excessive pressure in heating operation, the machine will
implement real-time detection over the indoor fan-coil temperature:
If the indoor coil temperature grows higher, 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 machine will
implement real-time detection over the outdoor condenser coil temperature: If the outdoor coil
temperature grows higher, 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 machine will implement real-time detection over the discharge temperature.
If the discharge temperature grows higher, 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 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 to return the oil in refrigerate system to the
compressor.
6) Operation Mode
a.. Mode Categori
Air conditioning mode is the operation mode set by users through remote controller, four modes are
available: cooling, heating, dehumidification, as well as fan mode.