DOWNLOAD LG LP-E5082HA_HL Service Manual ↓ Size: 3.96 MB | Pages: 127 in PDF or view online for FREE

– 62 –

CLOSE

Lo

OPEN

(1)

Gas side

Liquid side

Indoor unit

Check valve

Charging

cylinder

Outdoor unit

Open

Open

3-Way

valve

3-Way

valve

¤

• Connect the charge hose which you disconnected

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

• If you are using a gas cylinder, use a scale and

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

¤Ł

Purge the air from the charge hose.
• 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.

¤Ø

Open the valve (Lo side) on the charge set and
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).

¤Œ

• 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.

¤º

- Use a torque wrench to tighten the service port nut. 

- Be sure to check 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.

In general, possible trouble is classified as two causes.
The one is so called Starting Failure which is caused from an electrical defect, and the other is Ineffective Air
Conditioning caused by a defect in the refrigeration circuit and improper application.

– 63 –

Check outdoor coil
(heat exchanger) & fan
operation.

Check gas leakage.

Repair gas leak.

Replacement of unit if the
unit is beyond repair.

Satisfactory operation with
temperature difference of
inlet & outlet air ;
COOLING :   7~10

°

C

HEATING  : 15~17

°

C

Check heat load rise at
cooling operation.

Unexpected residue

Added electrical utensil

Check inside gas
pressure.

Adjust refrigerant
charge.

Malfunction of compressor.

Replacement of
compressor

Check of cold (warm) air cir-
culation for smooth flow.

Dirty indoor coil
(heat exchanger.)

Malfunction of fan.

Clogging of air filter.

Obstruction at air outlet.

Stop of auto air-swing.

Countermeasure against
above trouble.

Check clogging in refrigera-
tion circuit.

Repair clogging in refrigera-
tion circuit.

– 72 –

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

Is the unit 

operating?

Is the DC5V 

at 55pin of IC1

(MICOM)?

Is the DC5V 

at 54pin of IC1

(MICOM)?

Is the DC5V 

at 53pin of IC1

(MICOM)?

Is the DC12V 

at each terminal

(RY10COIL)?

Is the DC12V 

at each terminal

(RY8COIL)?

Is the 

AC220V(240V)

between "C" and "H"

of P.C.B?

Is the 

AC220V(240V)

between "C" and "M"

of P.C.B?

Is the 

AC220V(240V)

between "C" and "L"

of P.C.B?

Replacement IC3

Replacement RY8

Check the motor winding

Replacement RY9

Replacement RY10

Is the DC12V 

at each terminal

(RY9COIL)?

Replacement

IC1(MICOM) and

check the EVA-Th.

Reset the power ON/OFF S/W

– 73 –

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

Is the unit 

operating?

Is the DC5V at 55 pin

of IC1 (MICOM)?

Is the DC12V at each

terminal of RY1 coil of

SUB PCB ASM?

Replacement IC2

Is the AC220V (240V)

between "C" and "H" of

SUB P.C.B?

Replacement RY1 of 

SUB PCB

Check the motor winding 

Replacement RY2 of 

SUB PCB

Replacement RY3 of 

SUB PCB

Is the AC220V (240V)

between "C" and "M" of

SUB P.C.B?

Is the AC220V (240V)

between "C" and "L" of

SUB P.C.B?

Is the DC12V at each

terminal of RY2 of SUB

PCB ASM?

Is the DC12V at each

terminal of RY3 of SUB

PCB ASM?

Is the DC5V at 54 pin

of IC1 (MICOM)?

Is the DC5V at 53 pin 

of IC1 (MICOM)?

Replacement 

IC1 (MICOM) and

check the EVA -Th.

ON/OFF S/W ON