Deice Control; Soft Dry Operation - LG FMN0760NL Service Manual

9. Deice Control

• Deicing operation is controlled by timer and sensing the outdoor piping temperature.
• The first deicing starts only when the outdoor pipe temperature falls below -6°C after 45(30) minutes passed
from starting of heating operation.
• Deicing ends after 10(6) minutes passed from starting of deice operation or when the outdoor pipe temperature
rises over 12°C even if before 10(6) minutes.
• The second deicing starts only when the outdoor pipe temperture falls below -6°C after 45(30) minutes passed
from ending of the first deicing.
The outdoor
piping Temp.
12°C
DEICE OFF
-6°C
DEICE ON
INDOOR FAN
COMPRESSOR
4-WAY VALVE

10. Soft Dry Operation

• During Soft Dry Operation, the compressor ON temperature is the setting temperature plus 1°C, the compressor
OFF temperature is the setting temperature minus 0.5°C.
• When the room temperature rises over the compressor ON temperature, the operation mode is switched to the
cooling mode.
• When the room temperature falls between the compressor ON temperature and OFF temperature, the opera-
tion mode is switched to the Soft Dry Operation.
In this temperature range, 10min. Dry Operation, 7min operation OFF. During 10min Dry operation, if the room
temperature falls below compressor OFF temperature, Compressor OFF.
• In micom dehumidify mode, control of fan speed is as following.
Intake Air temp.
Setting temp. +1.0˚C
(Compressor ON)
Setting temp.
Setting temp. -0.5˚C
(Compressor OFF)
COMPRESSOR
OUTDOOR FAN
INDOOR FAN
More than 45(30) minutes
of heating operation
ON
ON
ON
Cooling 2min.58sec. 10min.
ON OFF ON
ON OFF ON
Selected
Fan
Within
More than 45(30) minutes
10(6) minutes
Deicing
OFF
ON
OFF
7min. 10min. Within 7min. Cooling
OFF ON OFF
OFF ON OFF
Low Fan
–21–
of heating operation
HOT-
START
ON
ON
ON
2min.58sec.
ON OFF ON
ON OFF ON
Selected
Low Fan
Fan
Deicing
OFF
ON
OFF
OFF
OFF