23
7. Electronic Circuit Diagram
7.1 CU-3E19RBU
+
BLK
BLK
1
2
3
W
W
W
W
BLK
Y/G
Y/G
R
1
CN-COM
(WHITE)
FUSE 401
(30A 250V)
ACL1
(BLACK)
ACN1
(WHITE)
FG1
(GREEN)
FG2
(GREEN)
CN-BLK (BLACK)
REC T IF IC ATION
CIRCUIT
REC T IFIC ATIO N
CIRCUIT
SWITCHING
POWER SUPPL Y
CIRCUIT
ELECTRONIC CONTROLLER
(MAIN)
ELECTRONIC CONTROLLER
(NOISE FILTER)
ELECTRONIC CONTROLLER
(DISPLAY)
PFC
CIRCUIT
AC-WHT
(
WHITE
)
Q10
U
W
V
(
RED
)
(
YELLOW
)
(
BLUE
)
P
N
U
V
W
W
B
R
R
R
R
1
33
11
1
1
1
10
11
1
1
4
4
2
4
4
4
1
1
7
CN-FM1
(WHITE)
CN-PSW1
(BLUE)
CN-TH3
(WHITE)
CN-TH4
(WHITE)
(WHITE)
CN-TH1
(YELLOW)
CN-TH2
t
t
t
t
t
t
t
t
t
t
FAN MOTOR
HIGH PRESSURE SW.
LIQUID PIPE TEMP. SENSOR (UNIT A) (THERMIS TO R)
LIQUID PIPE TEMP. SENSOR (UNIT B) (THERMISTOR)
LIQUID PIPE TEMP. SENSOR (UNIT C) (THERMISTOR) (5K, 3900)
GAS PIPE TEMP. SENSOR (UNIT A) (THERMISTOR)
GAS PIPE TEMP. SENSOR (UNIT B) (THERMISTOR)
GAS PIPE TEMP. SENSOR (UNIT C) (THERMISTOR) (5K, 3900)
OUTDOOR TEMP. SENSOR (THERMISTOR) (15K, 3950)
HEAT EXCHANGER TEMP. SENSOR (THERMISTOR) (5K, 3900)
DEFROST TEMP. SENSOR (THERMISTOR) (5K, 3900)
M
BLK
B
Y
Y
R
CONNECTOR
WHITE
COMPRESSOR
MS
3~
B
Y
AC-BLK
(
BLACK
)
FUSE 2
(T2.5A L250V)
FUSE 1
(T3.15A L250V)
CN-DATA
(
WHITE
)
CN-DATA
(
WHITE
)
CN-WHT
(
WHITE
)
W
BLK
BLK
REACTOR
REACTOR
L2-O
(BLK)
L1-O
(BLK)
L2-I
(GRY)
L1-I
(GRY)
BLK
BLK
GRY
GRYGRY
GRY
BLK
CONNECTOR
WHITE
1
W
W
W
W
W
W
W
W
W
1
99
NOISE FILTER
CIRCUIT
COMMUN IC ATION
CIRCUIT
G
G
CONTROL BOARD
CABINETSIDEPLATE
3
5
7
9
1
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
1
1
6
11
7
1
1
3
3
1
1
8
6
7
CN-DISP1
(WHITE)
CN-DISP1
(WHITE)
CN-DISP2
(WHITE)
CN-NMODE
(YELLOW)
CN-NMODE1
(WHITE)
CN-HOT
(BLUE)
(WHITE)
CN-EV1
(YELLOW)
CN-EV2
1
6
(BLUE)
CN-EV3
12
MMM
(WHITE)
CN-DIS
DISCHARGE TEMP.
SENSOR (THERMISTOR)
(50K, 3950)
UNIT C
ELECTRO-MAGNETIC COIL
(EXPANSION VALVE)
UNIT B
ELECTRO-MAGNETIC COIL
(EXPANSION VALVE)
UNIT A
ELECTRO-MAGNETIC COIL
(EXPANSION VALVE)
ELECTRO MAGNETIC
COIL
(4-WAY VALVE)
HEATER
CN-HT
(BLACK)
RY -HOT
RY -HT
14
8
B
Y
L1
L2
TERMINAL BOARD
TERMINAL BOARD
TO INDOOR UNIT A
1
2
3
BLK
TO INDOOR UNIT B
1
2
3
TO INDOOR UNIT C
SINGLE PHASE
POWER SUPPLY
AC 208/230V 60Hz
13V
b
e
c
5V
5V
5V
5V
5V
13V
b
c
e
13V
b
c
e
b
c
e
b
c
e
b
c
e
15V_2
b
c
e
5V
5V
5V
5V
13V
13V
5V
5V
5V
5V
PUMP DOWN
SW1
1
2
3
4
OPERATION TEST
SW2
1
2
3
4
WIRING CHECK
SW3
SW4 POWER SAVE
ON OFF
1
2
321
3
4
SW5 PRIORITY MODE
COOL ONLY
GREEN LED1
*JP1
ON OFF
321
GREEN LED2
GREEN LED3
GREEN LED4
GREEN LED5
GREEN LED6
5V
10
20
30
40
50
60
70
Temperature °C (°F)
Resistance (K)
Compressor Temp. Sensor
(Thermistor) Charateristics
0
10
20
30
40
50
60
70
Temperature °C (°F)
Resistance (K)
Sensor (Thermistor)
Characteristics
Outdoor Air Sensor
Outdoor Heat Exchanger
Sensor
-10
(40)
0
(32)
10
(50)
20
(68)
30
(86)
40
(104)
50
(122)
20
(68)
40
(104)
60
(140)
80
(176)
100
(212)
120
(248)
140
(284)
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