Hitachi RAC-50WX8 - Page 131

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LD303
LD302
LD301
SYSTEM POWER MODULE
MEASURING POSITION OF DC VOLTAGE
(
−
)
MEASURING POSITION OF DC VOLTAGE
(
＋
)
HIC P. W . B .
SERVICE SWITCH
SCREW
(
DANGER OF ELECTRIC SHOCK
)
SERVICE
OPERATION
SELF-DIAGNOSIS LIGHTING MODE
:OFF
L
D
3
0
2
L
D
3
0
1
RED RED
SELF-DIA-
GNOSIS NAME
DETAILS
MAIN CHECK POINT
[1]DURING OPERATION LD303 (RED) LIGHTS.
NORMAL
OPERATION
COMPRESSOR
OPERATION
NOT MALFUNCTION
OVERLOAD
(1)
OVERLOAD
(2)
OVERLOAD
(3)
ROTATI ON SPEED
SET
VALUE
TIME
THE ROTATION SPEED IS
AUTOMATICALLY CONT-
ROLLED TO PROTECT THE
COMPRESSOR IN THE
OVERLOAD CONDITION.
[2]DURING STOP LD303 (RED) GOES OFF. 
NORMAL
STOP
NOT MALFUNCTION.
1TIME
RESET
STOP
2TIMES
PEAK CURRENT
CUT
3TIMES
ABNORMAL
LOW SPEED
ROTATI ON
4TIMES
SWITCHING
FAILURE
SWITCHING FROM LOW
FREQUENCY SYNC START
TO POSITION DETECTION
OPERATION FAILURE.
5TIMES
OVERLOAD
LOWER LIMIT CUT
① OUTDOOR UNIT IS EXPOSED TO DIRECT
SUNLIGHT OR ITS AIRFLOW BLOCKED.
②FAN MOTOR ③FAN MOTOR CIRCUIT
④THE VOLTAGE IS EXTREMELY LOW. 
6TIMES
OH THERMISTOR
TEMP.RISE
7TIMES
THERMISTOR
ABNORMAL
①THERMISTOR ②CONNECTION
OF THERMISTOR DEFECTIVE
③THERMISTOR CIRCUIT 
8TIMES
①LEAK OF REFRIGERANT
②COMPRESSOR
12TIMES
EEPROM
READ ERROR
MICROCOMPUTER CANNOT
READ THE DATA IN EEPROM.
13TIMES
ACTIVE CONVERTER
DEFECTIVE
SYSTEM POWER MODULE
10TIMES
※EXAMPLE OF
BLINKING (5 TIMES)
2sec.
‥LIGHTS FOR 0.25
SEC AT INTERVAL
OF 0.25 SEC.
9TIMES
14TIMES
COMMUNICA-
TIONS ERROR
COMMUNICATIONS BETWEEN
INDOOR UNIT AND OUTDOOR
UNIT ARE INTERRUPTED
①CABLE IS WRONG CONNECTED
②CABLE IS OPEN ③INTERFACE
CIRCUIT OF BETWEEN INDOOR
UNIT AND OUTDOOR UNIT 
FAN LOCK
ERROR
OUTDOOR FAN RPM IS
NOT ROTAT E AS INTENDED
RPM
①FAN MOTOR
②FAN MOTOR CIRCUIT
OVERLOAD PROTECTION
FUNCTION IS REQUESTING
LOWER SPEED THAN MINIMUM
SPEED OF COMPRESSOR.
OVERVOLTAGE WAS
DETECTED BY
SYSTEM POWER MODULE
COMPRESSOR PEAK
CURRENT WAS BEYOND
MAXIMUM LIMIT.
LOST THE COMPRESSOR
ROTOR POSITION.
ABNORMAL THERMISTOR
VALUE (OPEN OR SHORT)
WAS DETECTED.
MICROPROCESSOR WAS
REBOOTED. (IT IS NORMAL
WHEN POWER SW HAS BEEN
TURNED ON)
STOPPED BY THERMOSTAT
OR CONTROLLER.
ACCELERATION
FAILURE
COMPRESSOR WAS NOT
ACCELERATED MORE THAN
MINIMUM SPEED.
COMPRESSOR OVERHEAT
WAS DETECTED BY
OH THERMISTOR.
①
LEAK OF REFRIGERANT ② COMPRESSOR
③OH THERMISTOR CIRCUIT
④FAN MOTOR ④FAN MOTOR CIRCUIT 
:LIGHT :BLINK
THIS SHOWS AN
OVERLOAD PROTECTION
STATUS.
NOT MALFUNCTION.
PROCEDURE OF REFRIGERANT PUMP
DOWN OR INDEPENDENT OPERATION
OF OUTDOOR UNIT.
1. CUT OFF THE POWER SOURCE ONCE
THEN ON AGAIN.
2. WAIT 1 MINUTE AL LEAST.
3. PRESS THE SERVICE SWITCH
(
WHICH IS ON THE PWB
)
MORE
THAN 1 SECOND.
SERVICE OPERATION WILL BE STARTED.
TO STOP THIS OPERATION
,
PRESS
THE SERVICE SWITCH AGAIN
(
MORE
THAN 1 SECOND
)
.
TO RESUME TO NORMAL OPERATION
,
CUT THE POWER SOUCE ONCE THEN
ON AGAIN.
IN ORDER TO PROTECT THE DAMAGE
OF COMPRESSOR
,
DO NOT OPERATE
MORE THAN 5 MINUTES WITH SERVICE
VALVE CLOSE.
DANGER
CONTRÔLER QUE LE
VOLTAGE EST DE
MOINS DE 10V. C.C.
AU POINT DE MESURE.
NE PA S TOUCHER LA
VIS DU MODULE DE
PUISSANCE DU SYSTÈME
À CAUSE DE SON
VOLTAGEÉLEVÉ.
NE TOUCHER AUCUNE
PARTIE SUR LE
BOÎTIER CONTENANT
L'INTERRUPTEUR DE
BRANCHEMENT.
ATTENDRE DIX MINUTES
APRÈS AVOIRÉTEINT
L'INTERRUPTEUR DE
COURANT QUAND
L'OPÉRATION
D'ENTRETIEN EST
TERMINEÉ.
(
C.C. DE 400V
)
ABNORMAL
POWER
SOURCE
ABNORMAL POWER SOURCE
WAS DETECTED
P. W . B .
①SYSTEM POWER MODULE
②COMPRESSOR ③P. W . B . 
①SYSTEM POWER MODULE
②COMPRESSOR ③P. W . B . 
①SYSTEM POWER MODULE
②COMPRESSOR ③P. W . B . 
P. W . B .
①ABNORMAL POWER SOURCE
②CABLE IS WRONG CONNECTED
③SYSTEM POWER MODULE
④P. W . B .
(3)
(2)
(1)
POINT DE MESURE
CN12
CN6
CN18
CN14
CN13
CN11
CN5 CN10 CN9
CN8
CN15
CN2
CN7
YEL
BLU
RED
BRN
GRN1
WHT
BLK
GRN2
RED
WHT
N
DANGER
(
DC400V
)
CUT THE POWER
SOURCE AND WAIT
MORE THAN 10
MINUTES BEFORE
SERVICE WORK.
DO NOT TOUCH THE
SCREWS AT SYSTEM
POWER MODULE DUE
TO HIGH VOLTAGE.
DO NOT TOUCH THE
OTHER COMPONENTS
WHEN OPERATING THE
SERVICE SWITCH.
CONFIRM THE DC
VOLTAGE AT THE
MEASURING POINT
SHOWN IN FIGURE
MUST BE LESS
THAN 10V.
LIGHTING MODE OF THE SELF-DIAGNOSIS LAMP
MODEL RAC-50WX8, RAC-D18EX3