Caution For Servicing - Mitsubishi Electric PK12FK Technical & Service Manual

6.2. Outdoor Unit
PU12/18EK WIRING DIAGRAM
1
SYMBOL NAME
C COMPRESSOR CAPACITOR
C3 FAN CAPACITOR
CH CRANKCASE HEATER
CONNECTING WIRES INDOOR/OUTDOOR
CN3<O. B>
CONNECTOR
CN4T<O. B> TRANSFORMER CONNECTOR
FROM INDOOR UNIT
CONNECTING WIRES
12V DC (polar)
POWER SUPPLY
208/230V
1phase 60Hz
Main functions of LED (when both Nos. 1 and 2 of ¤
LED NO. Output display (steady light)
LD1 Compressor indoor command
LD2 —
LD3 —
LD4 Compressor ON
LD5 Outdoor fan ON
LD6 —
LD7 —
LD8 Crankcase heater ON
NOTES :If the operation stops to function of the protection device, the check display flashes.
How to use SW1 and 2
Pressing ¤
erases the past check contents loaded on the microcom-
SW1
puter.
The output display (light) remains during operation but pressing ¤
displays the past check contents in flashing mode.
switch again returns to output display (light).

CAUTION FOR SERVICING

The connector marked s —⁄
ı
— is to turn the compressor ON-OFF during servicing. The
compressor stops by disconnecting the white connector as shown at the right.
CAUTION FOR POWER SUPPLY WIRING
Since LD8 lights when normal power is turned "ON", check the power supply with
the "ON" or "OFF" LD8.
Since the indoor transformer (T) is connected with 230V power, if 208V power is
used, change the wiring connection in the following Procedure.
CAUTIONS 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.
24
SYMBOL
LD1 ~ LD8 LED <CHECK, SERVICE>
MC COMPRESSOR
MF OUTDOOR FAN MOTOR (INNER THERMOSTAT)
O. B OUTDOOR CONTROLLER BOARD
SW1, 2, 3<O. B> SELECT SWITCH <CHECK, SERVICE>
T TRANSFORMER
FC <O. B> FAN CONTROLLER
F <O. B> FUSE <6A>
LED
1
YLW
TH3
2
ORN
TB3
O.B
SW1
SW2
SW3
OFF
ON
2 1
2
CN3
1
CN4T
4 3 2 1 4
BRN AC12.3V
RED
208V
WHT
RED AC12.3V
ORN
WHT
230V
T
RED
WHT
TB1
L1
RED
L2
WHT
GR
GRN
are ¨OFF¨)
SW3
Check display (flashing)
TH3 short / open
63H2 functions
TH3 overheat protection
Defective input
SW2
Pressing the
NAME
4 3 2 1
X12 X11
CN2
CN4
63HI
X12 X12
F
ZNR
TRF 52C CH R/1 S/2
BLU
S
A
CH
52C
B
52C
R U
BLU
2
WHT
T W
BLU
—
—
—
—
White connector
SYMBOL
TH3 OUTDOOR COIL THERMISTOR
X11 <O. B> CRANKCASE HEATER RELAY
X12 <O. B> COMPRESSOR RELAY
ZNR <O. B> VARISTOR
52C CONTACTOR
63H2 HIGH PRESSURE SWITCH <PROTECT>
TB1 POWER, SUPPLY TERMINAL BLOCK
CONNECTING WIRES INDOOR/OUTDOOR
TB3
TERMINAL BLOCK
51C OVERCURRENT RELAY
FC
5
26C
63H2
MF1
51CM
T/3
BLU
63H2
MF
R
51C
1 C
WHT
MC
RED
S
C
When power Supply is 208V
208V
RED WHITE
230V
ORANGE
NAME
RED
C3
ORN