Defrost Control; Self-Diagnosis Function - LG LB-D1861HL Service Manual

6. Defrost Control(30K/36K/42K/48K/60K)
• Defrost control is availavle 45 minutes later since heating mode operation started, and it will not prolong over
10 minutes.
• Defrost control is carried out when the outdoor pipe temp. falls below -6°C for more than 3 minutes after 45
minutes passed from starting of heating operation.
• Defrost ends after 10 minutes passed from starting of defrost operation or when the outdoor pipe temp. rises
over 12°C after 5 minutes passed from starting of defrost.
INDOOR FAN
COMPRESSOR
4-WAY VALVE
Defrost Control (New Type Defrost Control) (18K/24K)
• 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 dirrerence (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.

7. Self-diagnosis Function

• 'CHECK' will flash in the remote controller display when a problem occurs. Then please contact your dealer.
• Correct the accident point as shown in the table below before restarting operation.
• During the normal operation 'CHECK' won't be displayed in the remote controller.
Remote controller LCD
C H 0 1
CH 02
CH 03
CH 04(Optional)
More than 45 minutes
The outdoor
of heating operation
piping Temp.
12°C OFF
-6°C ON
Within
9min. 45sec.
5sec.
ON
OFF
ON
ON OFF
Accident Point
Indoor room temperature thermistor error
Indoor piping thermistor error
Indoor main body / Remote controller unit communication error
Water level float switch error
–21–
More than 45 minutes
of heating operation
More than 10 min.
running of compressor
HOT-
START
OFF ON
ON
ON
ON