DOWNLOAD LG LS-D2461HL Service Manual ↓ Size: 1.28 MB | Pages: 75 in PDF or view online for FREE

cylinder. 
–  Connect the charge hose which you dis-

connected from the vacuum pump to the valve
at the bottom of the cylinder. 

– If you are using a gas cylinder, also use a scale

and reverse the cylinder so that the system can
be charged with liquid. 

–  Open the valve at the bottom of the cylinder

and press the check valve on the charge set to
purge the air. (Be careful of the liquid
refrigerant).  The procedure is the same if
using a gas cylinder. 

charge the system with liquid refrigerant.
–  If the system can not be charged with the

specified amount of refrigerant, it can be
charged with a little at a time (approximately
150g each time) while operating the air
conditioner in the cooling cycle; however, one
time is not sufficient, wait approximately 1
minute and then repeat the procedure
(pumping down-pin).

the 3-way valve’s service port. 
–  Stopping partway will allow the gas to be

discharged.

– If the system has been charged with liquid

refrigerant while operating the air conditioner
turn off the air conditioner before disconnecting
the hose. 

port nut. 
– Use torque wrench to tighten the service port

nut to a torque of 1.8 kg.m.

– Be sure to check for gas leakage. 

\

This is different from previous procedures.
Because you are charging with liquid refrigerant
from the gas side, absolutely do not attempt to
charge with larger amounts of liquid refrigerant
while operating the air conditioner. 

Lo

Charging
cylinder 

Outdoor unit

Indoor unit

Liquid side

Gas side

CLOSE

Open

2-Way
valve

3-Way
valve

OPEN

Open

Check valve

(1)

ƒ¡

54

ƒ¡

1. Check temperature difference between intake and discharge air and operating current. 

Temp. Difference 

Temp. difference   :   approx. 0°C
Current                  :   less than 80% of 

rated current  

Temp. difference   :   approx. 8°C
Current                  :   less than 80% of 

rated current  

Temp. difference   :   less than 8°C
Current                  :   over the rated

current 

Temp. difference   :   over 8°C 

Operating Current 

All amount of refrigerant leaked out
Check refrigeration cycle

Refrigerant leakege
Clog of refrigeration cycle
Defective compressor 

Excessive amount of refrigerant

Normal 

Notice : 
Temperature difference between intake and discharge air depends on room air humidity. When the room air
humidity is relativery higher, temperature difference is smaller. When the room air humidity is relatively lower
temperature difference is larger. 

2. Check temperature and pressure of refrigeration cycle. 

Notice : 
1. The suction pressure is usually 4.5~6.0 kg/cm

2

G at normal condition. 

2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with

putty. 

Suction pressure

Temperature

(Compared with

(Compared with

Cause of Trouble

Description

the normal value)

the normal value)

Defective compressor

Current is low

Defective 4-way reverse valve

Excessive amount of

High pressure does not quickly

Normal

refrigerant

rise at the beginning of 
operation

Insufficient amount of 

Current is low

Lower 

Higher

refrigerant (Leakage)
Clogging

Current is low 

High 

Higher  

ƒ¡

55

ƒ¡

: The unit does not operate

1) Check Outdoor Unit 

ƒ¡

56

ƒ¡

YES

YES

YES

NO

YES

Is the trans input power

AC220-240V?

Is the trans 

output (red part) about 

AC38V?

Is the trans output

(blue part) about AC13V?

Check the fuse, check
wiring connection.

Is input voltage of

IC2 DC15V?

Is output voltage of

IC3 DC5V?

Exchange IC1

YES

NO

Check the main P.C.B
pattern.

NO

NO

Exchange BD1

NO

YES

Exchange the trans.

Is shorted the

trans output?

NO

YES

Is output voltage of

IC2 DC12V?

NO

Is the voltage of pin NO64

of IC1 DC5V?

YES

Exchange IC2

Exchange IC3

NO

Check P.C.B pattern

Is the trans 

output (red part) about 

AC25V?

18K

24K,26K,28K,30K

WARNING :
1. When servicing the unit, remove the power cord of outdoor unit.
2. The FAN MOTOR of outdoor unit operates intermittently for the reliability of the unit during operation.

2) Check Indoor Unit 

ƒ¡

57

ƒ¡

YES

YES

YES

Is the voltage between

NO.4 and NO.2 pin of CN-DC/DC

DC40V?

Is the input voltage

of IC2 about DC22V?

Is the output of IC2 DC12V?

Check the voltage of the
counter part of the outdoor
main P.C.B assembly.

Is the output of IC3 DC5V?

Is the connection

between main P.C.B and CN-Display 

P.C.B correct?

Exchange IC1

YES

Exchange TR01 and ZD01

NO

Exchange IC3

NO

Exchange IC2

YES

Is the output of NO.43 pin 

of IC1 DC5V?

NO

Is the voltage of NO.64 pin

of IC1 DC5V?

YES

Exchange IC4

Connect correctly

NO

Check P.C.B pattern

NO

NO

Is the voltage between

NO.4 and NO.2 pin of CN-DC/DC

DC28V?

24K, 26K, 28K, 30K

18K

Is the input voltage

of IC2 about DC18V?

NO

YES