LG LM-1962C2N_M_D Service Manual ▷ View online
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9. Defrost Control(Heating Model)
• Defrost operation is controlled by timer and sensing temperature of outdoor pipe.
• The first defrost starts only when the outdoor pipe temperature falls below -6°C after 60 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 within
max. 2 minutes 30 seconds when the outdoor pipe temperature rises over 12°C even if before 12 minutes.
• The second defrost starts only when the outdoor pipe temperature falls below -6°C after 60 minutes passed from
ending of the first defrost and more than 10 minutes operation of compressor.
OUTDOOR
PIPE TEMP.
PIPE TEMP.
More than 60 minutes
of heating operation
More than 10 min.
running of compressor
More than 60 minutes of
heating operation
More than 10 min.
running of compressor
Within
12minutes
Defrost
Defrost
HOT-
START
2 minutes
30 seconds
12°C
(DEFROST OFF)
-6°C
(DEFROST ON)
INDOOR FAN SPEED
ON
OFF
ON
OFF
COMPRESSOR
ON
ON
ON
ON
4-WAY VALVE
ON
OFF
ON
OFF
OUTDOOR FAN
ON
OFF
ON
OFF
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10. Soft Dry Operation Mode
• During Soft Dry Operation, the compressor ON temperature is the setting temperature plus 1°C, the com-
pressor 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 operation.
• When the room temperature falls between the compressor ON temperature and OFF temperature, the
operation mode is switched to the Soft Dry Operation.
• The operation diagram is shown below.
INTAKE AIR TEMP.
SETTING TEMP. +1°C
(Compressor ON)
SETTING TEMP. -0.5°C
(Compressor OFF)
Selecting
fan speed
fan speed
Selecting
fan speed
fan speed
Cooling
Operation
Soft Dry Operation
maximum
4 minutes
maximum
10 minutes
3 minutes
10 minutes
maximum
7 minutes
3 minutes
Cooling
Operation
COMPRESSOR
ON
OFF
ON
OFF
ON
OFF
ON
INDOOR FAN SPEED
Low
Low
Low
Low
Low
11. Cooling overload(Heating Model)
• Control indoor fan by sensing outdoor pipe temperature.
• One step down from setting fan speed if pipe temperature is over 50
¡
C and if below 45
¡
C, operate on set-
ting temperature.
50
°
C
45
°
C
OUTDOOR
PIPE
TEMP.
PIPE
TEMP.
INDOOR FAN
SETTING
FAN SPEED
FAN SPEED
SETTING
FAN SPEED
FAN SPEED
SETTING FAN SPEED
-1 STEP
-1 STEP
SETTING FAN SPEED
-1 STEP
-1 STEP
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12. Heating overload(Heating Model)
• Outdoor fan ON/OFF by sensing outdoor pipe temperature.
• Outdoor fan is OFF if pipe temperature is over 6.5°C and outdoor fan is ON if pipe temperature is below
0°C.
• Outdoor fan is off if any one part is heating overload condition.
13. Heating low temperature compensation function(Heating Model)
• In heating mode, indoor fan speed is one step lower if outdoor pipe temperature is below 34°C, operate as
setting temperature if above 38°C.
14. Buzzer ring function(Heating Model)
• Buzzer frequency ring changeable according to operation condition.
- When initial power supply is reset, buzzer frequency is increasing with sound "di, ri, ri, ring" and then buzzer rings.
- When operation is on, buzzer frequency is increasing with sound of "di, ri, ring" and then buzzer rings.
- When operation is off, buzzer frequency is decreasing with sound of "di, ri, ring" and then buzzer rings.
- When input remocon key except operation/stop key, "ding" is ringing.
- When operation is on, buzzer frequency is increasing with sound of "di, ri, ring" and then buzzer rings.
- When operation is off, buzzer frequency is decreasing with sound of "di, ri, ring" and then buzzer rings.
- When input remocon key except operation/stop key, "ding" is ringing.
• At the time of performance/stop reservation, there is no buzzer.
6.5
°
C
0
°
C
OUTDOOR
PIPE
TEMP.
PIPE
TEMP.
OUTDOOR FAN
OFF
ON
OFF
OFF
ON
INDOOR
PIPE
TEMP.
PIPE
TEMP.
38
°
C
34
°
C
INDOOR FAN
SETTING FAN SPEED
-1 STEP
-1 STEP
SETTING FAN SPEED
-1 STEP
-1 STEP
SETTING FAN SPEED
1. Heating Model
• Cooling, Soft Dry, Fan, Heating
• Timer Mode
• Sleep Mode
• Hot-start, Deice
Note: For normal operation after checking by test mode, you should press SW1 nine times for resetting or
reconnect the power cord.
2. Cooling Model
• Cooling, Soft Dry, Fan, Heating
• Timer Mode
• Sleep Mode
• Outdoor Unit Operating or not
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Display Function
Operation Indicator
Timer Indicator
Sleep Timer Indicator
Deice Indicator
Operation Indicator
Timer Indicator
Sleep Timer Indicator
Outdoor Unit Operation
OUT
DOOR
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