51C functions
THERMAL RELAY
51C
26C functions
LED NO.
LD1
LD2
LD3
LD4
LD5
LD6
LD7
LD8
Output display(light)
Compressor indoor command
Compressor ON
Outdoor fan ON
Crankcase heater ON
Check display(flush)
Pipe temperature sensor short/open
63H2 functions
RT overheat protection
Defective input
NOTES: 1. If the operation stops to function of the protection device,the check display flushes.
2. Symbols used in wiring diagram above are. :Terminal block :Connector :PC board insertion tab.
CAUTION FOR SERVICING
The connector marked for 52C is to turn the compressor ON-OFF during servicing.
The compressor stops by disconnecting the white connector as shown at the right.
CAUTIONS FOR POWER SUPPLY WIRING
Since LD8 lights when normal power is turned"ON", check the power supply with the"ON"or"OFF"LD8.
w Since the indoor transformer(T) is connected with 230V power, if 208V power is used, change the
wiring connection as shown at the right.
CAUTION FOR INDOOR AND OUTDOOR CONNECTING WIRES
Since the indoor and outdoor connecting wires has polarity, make sure to connect the same terminal numbers(1,2,3)for indoor and outdoor units.
How to use SW1 and 2
Main functions of LED (When both No.1 and 2 of SW3 are"OFF")
S
White connector
w When Power Supply is 208V
208V
RED
WHITE
230V
ORANGE
Heating indoor command
63H1 ON
4-Way valve ON
Bypass valve ON
SYMBOL
HC
NAME SYMBOL NAME SYMBOL NAME
CRANKCASE HEATER
FAN MOTOR CAPACITOR
COMPRESSOR CAPACITORC
C1, 2
63H2
63H1
52C
ZNR(O.B)
X14(O.B)
X12(O.B)
X13(O.B)
COMPRESSOR RELAY
21S4 RELAY
21R RELAY
VARISTOR
COMPRESSOR CONTACTOR
CONTROL HIGH PRESSURE SWITCH
PROTECT HIGH PRESSURE SWITCH
X11(O.B) HC RELAY
OUTDOOR CONTROLLER BOARD
SELECT SWITCH(CHECK,SERVICE)
TRANSFORMER
TERMINAL BLOCK
(32°F/15kΩ,77°F/5.4kΩ)
PIPE TEMPERATURE THERMISTOR
RT
TB1, 3
T
SW1·2·3(O.B)
O.B
MF1,2 FAN MOTOR(INNER THERMOSTAT)
COMPRESSOR MOTOR(INNER THERMOSTAT)
MC
LD1~LD8
LED(CHECK, SERVICE)
FC(O.B)
F(O.B)
21S4
21R BYPASS VALVE SOLENOID COIL
4-WAY VALVE SOLENOID COIL
FUSE(6A/250V)
FAN CONTROLLER
26C
DISCHARGE THERMAL SWITCH
96
95
51C
2/T1
4/T2
6/T3
1/L1
3/L2
5/L3
RED
YLW
YLW
51C
MF1
MF2
51CM
63H2
26C
FC
WHT
BLU
WHT
BLU
BLU
BLUBLU
T/3S/2R/1
ZNR
CH
HC
52C
A2
A1
S
GRY
GRY
WHT
WHT
52CTRF
CN4
X12 X11
RT
5
F
WHT
WHT
LD8
LD6
LD5
LD4
LD3
LD2
LD1
LD7
OFF
ON
POWER SUPPLY
1[ 208/230V
60Hz
TB1
TO INDOOR UNIT
CONNECTING WIRES
DC 12V (polar)
SW1
O.B
SW2
SW3
21
3
2
CN3
CN4T
4321
4
208V
230V
RED
BLK
RED
BLK
ORN
RED
BRN AC12.3V
RED AC12.3V
L1
L2
GR
TB3
2
1
YLW
LED
ORN
T
GRN
RED
RED
BRN
BRN
63H1
R
MC
C
S
RED
C
BLU
WHT
BLU
52C
RED
C1
ORN
YLW
BRN
C2
MF2
MF1
BLK
BLK
21
S4
21S4
21R
RED
RED
SV
X14
X14 X13
1
3
BRN
63H1
63H2
CN2
4321
X13 X12 X11
1
1
WHT
WHT
BLK
GRY
GRY
BLK
ORN
RED
YLW
BRN
WHT
BLU
WHT
BLU
2
3
4
2
3
4
BLU
WHT
WHT
BLU
26C
Pressing SW1 erases the past check contents
loaded on the microcomputer.
The output display (light) remains during operation
but pressing SW2 displays the past check contents
in flushing mode. Pressing the switch again returns
to output display(light).
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