Multi Zone Service Manual - General

- 16 -
Only for training and service purposes
Part 2 Functions & Controls
4.1 Hot start
• When heating is started, the indoor fan is stopped or very slow to prevent the cold air carry out
• When the temp. of heat exchanger reach 30°C(model by model), indoor fan is started.
4.2 Self-diagnosis Function
• The air conditioner installed can self-diagnosed its error status and then transmits the result to the central control.
Therefore, a rapid countermeasure against failure of the air conditioner allows easy management and increases the
usage life of air conditioner.
• Refer to trouble shooting guide.
4.3 Soft dry operation
• When the dehumidification operation input by the remote control is received, the intake air temperature is detected and
the setting temp is automatically set according to the intake air temperature.
• While compressor off, the indoor fan repeats low airflow speed and stop.
• While the intake air temp is between compressor on temp. and compressor off temp., 10-min dehumidification opera-
tion and 4-min compressor off repeat.
Compressor ON Temp. ‘ Setting Temp+1
°F( 0.5°C)
Compressor OFF Temp. ‘ Setting Temp-1 °F( 0.5°C)
• In 10-min dehumidification operation, the indoor fan operates with the low airflow speed.
4. Reliability
Intake air Temp. Setting Temp.
78°F(26°C) ≤ intake air temp. 77°F(25°C)
76°F(24°C) ≤ intake air temp.< 78°F(26°C) intake air temp. -2°F(-1°C)
72°F(22°C) ≤ intake air temp. < 76°F(24°C) intake air temp. 1°F(-0.5°C)
64°F(18°C) ≤ intake air temp. < 72°F(22°C) intake air temp.
intake air temp. < 64°F(18°C) 64°F(18°C)