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Room temperature sensor. (Thermistor)

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Maintains the room temperature in accordance with the Setting Temp. 

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Indoor fan is delayed for 5 seconds at the starting.

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Restarting is inhibited for approx. 3 minutes.

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High, Med, Low

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Intermittent operation of fan at low speed.

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The louver can be set at swing up and down automatically.

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The setting temperature, indoor fan speed and desired operation mode are automatically set.

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Both the indoor and outdoor fan stops during defrosting.

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Hot start after defrost ends.

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The indoor fan stops until the evaporator piping temperature will be reached at 28

¡

.

–3–

–30–

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)

–31–

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  

–32–

: The unit does not operate.

YES

YES

YES

NO

YES

Is the input voltage

of transformer AC230V?

Is the input voltage

of IC01D DC12V?

Check the FUSE
and the wiring diagram.

Is the output voltage 

of IC01D DC12V?

Is the PIN 31,32 of

MICOM. DC5V?

Exchange MICOM

YES

NO

Check the main P.C.B
pattern

NO

NO

Check the D02D~D05D

NO

YES

Exchange 
the transformer

Is shorted the

transformer output?

NO

YES

Is the output voltage 

of IC02D DC5V?

NO

Exchange IC01D

Exchange IC02D

Is the output voltage

of transformer about DC12V?

Check the 
5V P.C.B pattern.