Service Manual 81
Operation Details
• While in compressor off, the indoor fan is off when the indoor pipe temperature is below 33°C, when above
35°C , it operates with the low airflow speed.
• If overloaded while in heating mode operation, in order to prevent the compressor from OLP operation, the
outdoor fan is turned on/off according to the indoor pipe temperature
• While in defrost control, both of the indoor and outdoor fans are turned off.
■ Fuzzy Operation
• When any of operation mode is not selected like the moment of the power on or when 3 hrs has passed
since the operation off, the operation mode is selected.
• When determining the operation mode, the compressor, the outdoor fan, and the 4 way valve are off and
only the indoor fan is operated for 15 seconds. Then an operation mode is selected according to the intake
air temperature at that moment as follows.
24°C ≤ Inatake Air Temperature ➲ Fuzzy Operation for Cooling
21°C ≤ Inatake Air Temperature <24°C ➲ Fuzzy Operation for Dehumidification
Inatake Air Temperature <21°C ➲ Fuzzy Operation for Heating
• If any of the operation modes among cooling / dehumidification / heating mode operations is carried out for
10 sec or longer before Fuzzy operation, the mode before Fuzzy operation is operated.
1) Fuzzy Operation for Cooling
• According to the setting temperature selected by Fuzzy rule, when the intake air temperature is 0.5°C or
more below the setting temperature, the compressor is turned off. When 0.5°C or more above the setting
temperature, the compressor is turned on.
Compressor ON Temperature ➲ Setting Temperature +0.5°C
Compressor OFF Temperature ➲ Setting Temperature – 0.5°C
• At the beginning of Fuzzy mode operation, the setting temperature is automatically selected according to
the intake air temperature at that time.
26°C≤ Intake Air Temperature ➲ 25°C
24°C≤ Intake Air Temperature <26°C ➲ Intake Air Temperature – 1°C
22°C≤ Intake Air Temperature <24°C ➲ Intake Air Temperature – 0.5°C
18°C≤ Intake Air Temperature <22°C ➲ Intake Air Temperature
Intake Air Temperature <18°C ➲ 18°C
• When the Fuzzy key (Temperature Control key) is input after the initial setting temperature is selected, the
Fuzzy key value and the intake air temperature at that time are compared to select the setting temperature
automatically according to the Fuzzy rule.
• While in Fuzzy operation, the airflow speed of the indoor fan is automatically selected according to the tem-
perature.
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