LG LP-E5082HA Service Manual ▷ View online
– 62 –
2) Heating Mode
(After Evacuation)
CLOSE
Lo
OPEN
(1)
Gas side
Liquid side
Indoor unit
Check valve
Charging
cylinder
Outdoor unit
Open
Open
3-Way
valve
3-Way
valve
• Procedure
¤
Connect the charge hose to the charge cylinder.
• Connect the charge hose which you disconnected
from the vacuum pump to the valve at the bottom
of the cylinder.
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.
charged with liquid.
¤Ł
Purge the air from the charge hose.
• Open the valve at the bottom of the cylinder and
• 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.
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
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).
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
Immediately disconnect the charge hose from the
3-way valve's service port.
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.
off the air conditioner before disconnecting the
hose.
¤º
Mount the valve stem nuts and the service port nut.
- 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.
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.
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.
Unit runs but ineffective cooling
– 63 –
9. TROUBLESHOOTING GUIDE
Ineffective Cooling or Heating
Check outdoor coil
(heat exchanger) & fan
operation.
(heat exchanger) & fan
operation.
Check gas leakage.
Repair gas leak.
Replacement of unit if the
unit is beyond repair.
unit is beyond repair.
Satisfactory operation with
temperature difference of
inlet & outlet air ;
COOLING : 7~10
temperature difference of
inlet & outlet air ;
COOLING : 7~10
°
C
HEATING : 15~17
°
C
Check heat load rise at
cooling operation.
cooling operation.
Unexpected residue
Added electrical utensil
Check inside gas
pressure.
pressure.
Adjust refrigerant
charge.
charge.
Malfunction of compressor.
Replacement of
compressor
compressor
Check of cold (warm) air cir-
culation for smooth flow.
culation for smooth flow.
Dirty indoor coil
(heat exchanger.)
(heat exchanger.)
Malfunction of fan.
Clogging of air filter.
Obstruction at air outlet.
Stop of auto air-swing.
Countermeasure against
above trouble.
above trouble.
Check clogging in refrigera-
tion circuit.
tion circuit.
Repair clogging in refrigera-
tion circuit.
tion circuit.
– 72 –
2-1) Indoor fan does not operate(Models below 48,000 BTU/h capacity)
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 –
2-2) Indoor fan does not operate (Models over 72,000 BTU/h capacity(8HP models))
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
Click on the first or last page to see other LP-E5082HA service manuals if exist.