Defrost Control; Fuzzy Operation; Fuzzy Operation For Cooling - LG A2UN186FA0 Service Manual

• While in compressor off, the indoor fan is off when the indoor pipe temp 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 temp.
• While in defrost control, both of the indoor and outdoor fans are turned off.

Defrost Control

• Defrost operation is controlled by timer and sensing temperature of outdoor pipe.
• The first defrost starts only when the outdoor pipe temperature falls below -5°C after 40 minutes passed from
starting of heating operation and more than 10 minutes operation of compressor.
• Defrost ends after 12 minutes passed from starting of defrost operation or after the outdoor fan operates with-
in max. 2 minutes 30 seconds when the outdoor pipe temperature rises over 12°C even it before 12 minutes.
• The second defrost starts only when the outdoor pipe temperature falls below -5°C after 40 minutes passed
from ending of the first defrost and more than 10 minutes operation of compressor.

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
temp at that moment as follows.
24°C ≤ Inatake Air Temp
21°C ≤ Inatake Air Temp<24°C
Inatake Air Temp<21°C
• 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 temp is 0.5°C or more below
the setting temp, the compressor is turned off. When 0.5°C or more above the setting temp, the compressor
is turned on.
Compressor ON Temp
Compressor OFF Temp
• At the beginning of Fuzzy mode operation, the setting temperature is automatically selected according to the
intake air temp at that time.
26°C≤ Intake Air Temp
24°C≤ Intake Air Temp<26°C
22°C≤ Intake Air Temp<24°C
18°C≤ Intake Air Temp<22°C
Intake Air Temp<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.
Fuzzy Operation for Cooling
Fuzzy Operation for Dehumidification
Fuzzy Operation for Heating
Setting Temp +0.5°C
Setting Temp – 0.5°C
25°C
Intake Air Temp – 1°C
Intake Air Temp – 0.5°C
Intake Air Temp
18°C
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