Mitsubishi PU12EK Technical & Service Manual page 17

MODEL : PU42EK7
SYMBOL NAME
CONNECTOR
CN3<O.B>
(CONNECTING WIRES INDOOR/OUTDOOR)
CN4T<O.B>
CONNECTOR(TRANSFORMER)
CH CRANKCASE HEATER
C3, 4 RUN CAPACITOR FOR MF1,2
C RUN CAPACITOR FOR MC
FC<O.B> FAN CONTROLLER
F<O.B> FUSE(6A/250V)
1
YLW
TO INDOOR UNIT
2
ORN
CONNECTING WIRES
DC 12V (polar) TB3
BRN AC12.3V
RED AC12.3V
TB1
L1
POWER SUPPLY
L2
208/230V
1 phase 60Hz GR
Main functions of LED
(When both No.1 and 2 of SW3 are"OFF")
LED NO. Output display(light)
LD1 Compressor indoor command
LD2
LD3
LD4 Compressor ON
LD5 Outdoor fan ON
LD6
LD7
LD8 Crankcase heater ON
NOTE: If the operation stops to function of the protection device, the check display flushes.
CAUTION FOR SERVICING
S
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.
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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)for indoor and outdoor units.
PU42EK7
1 2
SYMBOL
LD1~LD8 LED(CHECK, SERVICE)
MC COMPRESSOR MOTOR (INNER THERMOSTAT)
MF1, 2 FAN MOTOR (INNER THERMOSTAT)
O.B OUTD00R CONTROLLER BOARD
SW1·2·3<O.B> SELECT SWITCH(CHECK,SERVICE)
T TRANSFORMER
TB1 TERMINAL BLOCK(POWER SUPPLY)
TERMINAL BLOCK
TB3
(CONNECTING WIRES INDOOR/OUTDOOR)
LED
TH3
O.B
SW1
CN2
SW2
SW3
OFF
ON
2 1
2
CN3
1
CN4T
4
4 3 2 1
RED
208V
WHT
ORN WHT
230V
T
RED
WHT
52C
RED
1/L1
WHT
3/L2
5/L3
GRN
RED
Check display(flush)
Pipe temperature sensor short/open
63H2 functions
51C functions
26C functions
TH3 overheat protection
Defective input
NAME
4 3 2 1
X12 X11
CN4
63H1 63H1 63H1 63H1
X12 X11
F
CH ZNR
TRF 52C R/1 S/2
BLU BLU
S
A1
CH
52C
A2
51C
2/T1
BLU
R
4/T2 WHT
C
RED
S
BLU
C
6/T3
How to use SW1 and 2
White connector
17
SYMBOL NAME
THERMISTOR FOR PIPE TEMPERATURE
TH3
(32°F/15kΩ,77°F/5.4kΩ)
AUXILIARY RELAY FOR CH
X11<O.B>
AUXILIARY RELAY FOR MC
X12<O.B>
VARISTOR
ZNR<O.B>
51C THERMAL RELAY
52C MAGNETIC CONTACTOR FOR MC
63H2 HIGH PRESSURE SWITCH(PROTECT)
26C DISCHARGE THERMAL SWITCH
FC
5
26C
63H2
51CM
T/3
95
51C
26C 63H2
96
MC
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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When Power Supply is 208V
RED 208V
230V
ORANGE
MF2
MF1
RED
MF1 C3
ORN
BRN
MF2
C4
YLW
WHITE