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—36—

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 revers 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
(High handle)

Open

2-Way
valve

3-Way
valve

OPEN
(Low handle)

Open

Check valve

(1)

Manifold
Gauge

—37—

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 

: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 valve)

High 

Defective compressor

Current is low

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 

Higher  

—38—

Turn off Main Power.

Turn on Main Power.

Does "beeping" sound is made from the Indoor Unit?

Primarily, the operating condition of Micom is OK.

Check the voltage of power(About AC 220V/240V, 50Hz).

• Main power's voltage
• Voltage applied to the unit
• Connecting method of Indoor/Outdoor connecting

cable

• Check PWB Ass'y

- Fuse
- Pattern damage
- Varistor(ZNRI)

Check the connection housing for contacting.

• Connector related to CN-POWER
• Connector related to CN-FAN
• Connector contacting of Outdoor Fan/Compressor
• Display PWB Ass'y 

Check each load(Indoor/Outdoor Fan Motor,
Compressor, Stepping Motor) and contacting 
condition of related connector.

PCB Board Operation Check

Items

• Power Transformer

(Outdoor unit)
- Input Voltage
- Output Voltage

‹X

• IC2(7812) Output

(Indoor/Outdoor unit)

‹X

• IC3(7805) Output

(Indoor/Outdoor unit)

‹X

• IC4(KIA7036, Reset IC)

X01(4MHz)

• Replace Trans

• Replace IC2

• Replace IC3

• Replace faulty parts

- About AC220V/240V±10% - Check the power voltage
- About AC14±3V

• DC +12V

• DC +5V

• Voltage of Outdoor unit Micom No. 8,

(DC +4.5V over) and Soldering condition.

Content

Remedy

NO

YES

(After 10 seconds)

—39—

Turn on Main Power

While the compressor has been stopped, the compressor does not

operate owing to the delaying function for 3 minutes after stopped.

Caused by other parts except the remote controller

Cause by the remote controller

When the mark(       ) is displayed in LCD screen, replace
battery.

Check the contact of CN-DISP connector.

When the compressor stopped Indoor Fan is driven by a low speed.
At this point the wind speed is not controlled by the remote controller.
(When operated in the Sleeping Mode, the wind speed is set to the
low speed by force.)

Check DISP PWB Ass'y
- Voltage between CN DISP 

¤

- 

¤

: DC +5V

When the detect switch(double key) inside the remote 
controller door is fault, it is impossible to operate 

Check the connecting circuit between the remote controller
MICOM (No. 

§

) - R17(2

Ω

) - IR LED - Q1 - R16(2.2K

Ω

).

Check point

• Check the connecting circuit between PIN

¤Ł

-

R75(1K) - C71(680PF) - MICOM PIN 

¤

• Check Receiver Ass'y