LG LB-H1860HL_CL / LB-H2460HL_CL / LB-G3680HL_CL Service Manual ▷ View online
–13–
Operation Details
(1) The function of main control
1. Time Delay safety Control
• 3min... The compressor is ceased for 3minutes to balance the pressure in the refrigeration cycle.
(Protection of compressor)
• 30sec... The 4-way valve is ceased for 30sec. to prevent the refrigerant-gas abnormal noise when the Heating
operation is OFF or switched to the other operation mode while compress is off.
While compressor is running, it takes 3~5 seconds to switch.
2. Soft-Dry Operation
• The indoor fan speed is automatically set to the low, so the shift of the indoor fan speed is impossible because of
already being set to the best speed for Dry Operation by Micom Control.
3. Cooling Mode Operation
• When selecting the Cooling( ) Mode Operation, the unit will operate according to the setting by the remote con-
troller and the operation diagram is as following.
Intake Air temp.
SET TEMP.+0.5°C
(COMP. ON)
SET TEMP. -0.5°C
(COMP. OFF)
More than
More than
3 minutes
3 minutes
Selecting
Selecting
Selecting
fan speed
fan speed
fan speed
COMPRESSOR
ON
OFF
ON OFF
ON
INDOOR FAN
Low Low
–14–
Intake Air temp.
Setting temp.+3°C
(Compressor OFF)
Setting temp.
(Compressor ON)
(Compressor ON)
INDOOR FAN
Low
OFF Low
Low
OFF
COMPRESSOR
ON
OFF
ON
OFF
• A point;
While the indoor Heat-Exchanger temperature is higher than 40°C fan operates at low speed, when
it becomes lower than 40˚C fan stops.
• B point;
When the indoor Heat-Exchanger temperature is higher than 42°C, fan operates at seleted fan
speed, when it becomes lower than 39°C, the fan operates at low speed.
4. Heating Mode Operation (Except Cooling Model)
The unit will operate according to the setting by the remote controller and the operation diagram is shown as following.
Hot Start
Low
Selecting
Fan Speed
minimum 3min
Selecting fan
speed
minimum
10sec.
1min
A
A
minimum
10sec.
B
5. Hot-Start Control
• The indoor fan stops until the evaporator piping temperature will be reached to 31°C.
• The operation diagram is as following.
PIPING
TEMPERATURE
TEMPERATURE
1min
COMPRESSOR
INDOOR FAN
ON
28
°
C
: Selected Fan
: Low Fan
: Fan Stop
31
°
C
–15–
6. Defrost Control(36K)
• 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.
■
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.
• 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.
• 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
Accident Point
CH 01
Indoor room temperature thermistor error
CH 02
Indoor piping thermistor error
CH 03
Indoor main body / Remote controller unit communication error
CH 04
(Optional)
Water level float switch error
More than 45 minutes
of heating operation
Within
9min. 45sec.
ON
OFF
ON
ON
ON
ON
OFF
OFF
COMPRESSOR
4-WAY VALVE
INDOOR FAN
-6
°
C ON
12
°
C OFF
The outdoor
piping Temp.
ON
More than 10 min.
running of compressor
More than 45 minutes
of heating operation
5sec.
HOT-
START
ON
–16–
Installation of Indoor, Outdoor Unit
1. Selection of the best location
1) Indoor unit
Select location
Install the air conditioner in the location that satis-
fies the following conditions.
• The place shall easily bear a load exceeding four
Install the air conditioner in the location that satis-
fies the following conditions.
• The place shall easily bear a load exceeding four
times the indoor unit’s weight.
• The place shall be able to inspect the unit as the
figure.
• The place where the unit shall be leveled.
• The place shall allow easy water drainage.(Suit-
• The place shall allow easy water drainage.(Suit-
able dimension “H” is necessary to get a slope to
drain as figure.)
drain as figure.)
• The place shall easily connect with the outdoor
unit.
• The place where the unit is not affected by an
electrical noise.
• The place where air circulation in the room will be
good .
• There should not be any heat source or steam
near the unit
2) Outdoor unit
• If an awning is built over the unit to prevent direct
sunlight or rain exposure, be careful that heat
radiation from the condenser is not restricted.
radiation from the condenser is not restricted.
• There should not be any animals or plants which
could be affected by hot air discharged.
• Ensure the spaces indicated by arrows from the
wall, ceiling, fence or other obstacles.
3) Piping length and the elevation
Indoor unit
Outdoor unit
B
A
More than
30cm
30cm
More than
30cm
30cm
More than
70cm
70cm
Sunr
oof
Fence or
obstacles
H
600
600
Top view
(unit: mm)
Front view
Front
Inspection hole
(600X600)
Control box
1000
• If 18K Model is installed at a distance of 15m, 225g of
refrigerant should be added (15-7.5) x 30g = 225g
• Capacity is based on standard length and maximun
allowance length is on the basis of reliability.
• Improper refrigerant charge may result in abnormal
cycle.
18K BTU/h
30
35
45
35
45
36K BTU/h
Capacity
Gas
5/8"
5/8"
5/8"
5/8"
Liquid
1/4"
1/4"
1/4"
1/4"
Elevation B(m)
Length A(m)
*Additional
refrigerant
(g/m)
Pipe Size
(Diameter: Ø)
Standard
7.5
7.5
7.5
7.5
Standard
5
5
5
5
5
Max.
50
50
50
50
50
Max.
30
30
30
30
30
24K BTU/h
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