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Defrost Control
• While in heating mode operation in order to protect the evaporator pipe of the outdoor unit from freezing, reversed to
cooling cycle to defrost the evaporator pipe of the outdoor unit.
• Defrost control is available 45 min. later since heating mode operation started, and it will not prolong over 10 min.
• Defrost control is carried out according to the following priority order while in heating mode operation.
1st priority : Defrost control is carried out according to the indoor pipe temp 60 min. later since heating mode opera-
tion started.
2nd priority : The temp differences between the indoor pipe temp and the intake air temp 25 min. later(
∆
T1) and 45
min. later (
∆
T2) since heating mode operation started are measured, then defrost control is carried out
according to the dirrerence (
∆
T=
∆
T1-
∆
T2)
3rd priority : Defrost control is carried out according to the temp difference (E=TE1-TE2) between the indoor pipe
temperatures of 25 min later(TE1) and 45 min later (TE2) after heating mode operation started.
• When the indoor pipe temp is 41°C or above, defrost control is not carried out even if the condition is one of the
defrost conditions above.
• While in defrost control, the compressor is on and the indoor fan, the outdoor fan, and the 4 way valve are off.
More than 45 minutes
of heating operation
Within
9min. 45sec.
ON
OFF
ON
ON
ON
OFF
COMPRESSOR
4-WAY VALVE
INDOOR FAN
-6
°
C ON
12
°
C OFF
The outdoor
piping Temp.
More than 10 min.
running of compressor
More than 45 minutes
of heating operation
HOT-
START
ON
Summary of Contents for A2UN186FA0
Page 104: ... 104 Electronic Control Device 1 Room Type Indoor Unit MAIN P C B DC ASM MAIN P C B AC ASM ...
Page 105: ... 105 2 Cassette Type Indoor Unit MAIN P C B DC ASM ...
Page 106: ... 106 3 Art Cool Type Indoor Unit TOP VIEW BOTTOM VIEW ...
Page 107: ... 107 4 Convertible Type Indoor Unit ...
Page 109: ... 109 6 SUB P W B ASSEMBLY Art Cool Type Indoor Unit TOP VIEW BOTTOM VIEW ...
Page 110: ... 110 7 Outdoor Unit MAIN P C B ASM V P U N W ...
Page 111: ... 111 Schematic Diagram 1 Room Type Indoor Unit ...
Page 113: ... 113 3 Art Cool Type Indoor Unit ...
Page 114: ... 114 4 Convertible Type Indoor Unit RY 4WAY RY OUTFAN ...
Page 132: ...P No 3828A20097N August 2003 Printed in Korea ...