LG LS-K2460HL Service Manual ▷ View online
2) Balance refrigerant of the 2-way, 3-way valves
(Gas leakage)
- 47 -
Lo
Open
Open
3-Way
valve
valve
2-Way
valve
valve
Gas side
CLOSE
OPEN
Outdoor unit
Liquid side
Indoor unit
• Procedure
(1) Confirm that both the liquid side and gas side
valves are set to the back seat.
(2) Connect the charge set to the 3-way valve's port.
-Leave the valve on the charge set closed.
-Connect the charge hose to the service port.
-Connect the charge hose to the service port.
(3) Open the valve (Lo side) on the charge set and dis-
charge the refrigerant until the gauge indicates 0
kg/cm
kg/cm
2
G.
- If there is no air in the refrigerant cycle (the pres-
sure when the air conditioner is not running is high-
er than 1 kg/cm
er than 1 kg/cm
2
G), discharge the refrigerant until
the gauge indicates 0.5 to 1 kg/cm
2
G. if this is the
case, it will not be necessary to apply an evacua-
tion.
tion.
- Discharge the refrigerant gradually; if it is dis-
charged too suddenly, the refrigeration oil will also
be discharged.
be discharged.
3. Evacuation
(All amount of refrigerant leaked)
• Procedure
(1) Connect the vacuum pump to the center hose of
charge set center hose
(2) Evacuation for approximately one hour.
- Confirm that the gauge needle has moved
toward -76cmHg (vacuum of 4 mmHg or less).
(3) Close the valve (Lo side) on the charge set, turn off
the vacuum pump, and confirm that the gauge nee-
dle does not move (approximately 5 minutes after
turning off the vacuum pump).
dle does not move (approximately 5 minutes after
turning off the vacuum pump).
(4) Disconnect the charge hose from the vacuum
pump.
- Vacuum pump oil.
If the vacuum pump oil becomes dirty or depleted,
replenish as needed.
replenish as needed.
- 48 -
Lo
Open
Open
Vacuum pump
2-Way
valve
valve
Outdoor unit
Liquid side
Indoor unit
Gas side
3-Way
valve
valve
CLOSE
OPEN
4. Gas Charging
(After Evacuation)
• Procedure
(1) Connect the charge hose to the charging 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, also use a scale and
reverse the cylinder so that the system can be
charged with liquid.
charged with liquid.
(2) 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.
the air. (Be careful of the liquid refrigerant). The
procedure is the same if using a gas cylinder.
(3) 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
- 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 approxi-
mately 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 approxi-
mately 1 minute and then repeat the procedure
(pumping down-pin).
(4) Immediately disconnect the charge hose from the
3-way valve's service port.
- Stopping partway will allow the gas to be dis-
charged.
- If the system has been charged with liquid refriger-
ant while operating the air conditioner turn off the
air conditioner before disconnecting the hose.
air conditioner before disconnecting the hose.
(5) Mount the valve stem nuts and the service 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.
- 49 -
Lo
Charging
cylinder
cylinder
Outdoor unit
Indoor unit
Liquid side
Gas side
CLOSE
Open
2-Way
valve
valve
3-Way
valve
valve
OPEN
Open
Check valve
(1)
This is different from previous procedures.
Because you are charging with liquid refriger-
ant 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 refriger-
ant from the gas side, absolutely do not
attempt to charge with larger amounts of liquid
refrigerant while operating the air conditioner.
- 50 -
Cycle Troubleshooting Guide
Trouble analysis
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 reated
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
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 tem-
perature difference is larger.
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 tem-
perature difference is larger.
2. Check temperature and pressure of refrigeration cycle.
Notice :
1. The suction pressure is usually 4.5~6.0 kg/cm
1. The suction pressure is usually 4.5~6.0 kg/cm
2
G(Cooling) 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 valve)
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.
operation.
Insufficient amount of
Current is low.
Lower
Higher
refrigerant (Leakage)
Clogging
Clogging
Current is low.
High
Higher
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