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- Connect the charge hose which you disconnect-

ed 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 refriger-
ant). The procedure is the same if using a gas
cylinder.

- If the system can not be charged with the speci-

fied 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 suffi-
cient, wait approximately 1 minute and then
repeat the procedure (pumping down-pin).

- Stopping partway will allow the gas to be dis-

charged.

- If the system has been charged with liquid

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

- Use torque wrench to tighten the service port

nut to a torque of 1.8 kg.m.

- Be sure to check for gas leakage.

- 47 -

Lo

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.

Indoor unit

Liquid side

Outdoor unit

Open

3-Way

valve

3-Way

valve

Open

Gas side

Check valve

Charging

cylinder

CLOSE

OPEN

(1)

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

All amount of refrigerant leaked out. 
Check refrigeration cycle.

Refrigerant leakage
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.

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.

- 48 -

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

Temp. Difference 

Operating Current

Suction pressure

Temperature

(Compared with

(Compared with

Cause of Trouble

Description

the normal value)

the normal value)

High

Defective compressor

Current is low.

Defective 4-way reverse valve

Normal

Excessive amount of 

High pressure does not quickly 

refrigerant

rise at the beginning of operation.

Insufficient amount of

Current is low.

Lower

Higher

refrigerant (Leakage)
Clogging

Current is low.

Higher

- 49 -

YES

YES

YES

NO

YES

YES

NO

NO

NO

NO

YES

NO

: The unit does not operate.

Is the trans input power

AC240V?

Is the trans output power

about AC14V?

Is output voltage of IC2

DC12V?

Is output voltage of IC3

DC5V?

Is the reset circuit 

all right?

Check the fuse, check
the wiring diagram.

Is shorted the

trans output?

Check the main P.C.B
pattern.

Exchange the trans.

Exchange IC2.

Exchange IC3.

Check and exchange IC4.

Exchange Main P.C.B ASM

- 50 -

NO

YES

YES

NO

YES

YES

NO

NO

NO

NO

YES

NO

YES

YES

: Fan does not operate.

Is it the DRY Mode?

Is it the HOT Mode?

Is the IC8 O.K?

Is the each SSR 

all right?

Exchange the defect SSR

Check the FAN Motor and
Connector (CN-AC/DC)
Check the SSR-L, M, H

Does the temperature

set all right?

Does the temperature

set all right?

Does the deice

LED 4 right?

Adjust setting temp.

Adjust setting temp.

Check the FAN Motor
and Connector.

Exchange the IC8.