Mitsubishi PU12EK Technical & Service Manual page 15

MODELS : PU24EK PU30EK PU36EK PU42EK2
SYMBOL NAME
C COMPRESSOR CAPACITOR
C3, 4 FAN CAPACITOR
CH CRANKCASE HEATER
CONNECTING WIRES INDOOR/OUTDOOR
CN3<O. B>
CONNECTOR
CN6T<O. B> TRANSFORMER CONNECTOR
FC <O. B> FAN CONTROLLER
F3<O. B> FUSE <6A>
1
FROM INDOOR UNIT
CONNECTING WIRES 2
12V DC (polar)
TB3
TB1
L1
POWER SUPPLY
L2
208/230V
1phase 60Hz
GR
Main functions of LED (when both No. 1 and 2 of
LED NO. Output display (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 micro-
SW1
computer.
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.
CAUTIONS 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.
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.
SYMBOL
LD1~LD8 LED <CHECK, SERVICE>
MC COMPRESSOR (INNER THERMOSTAT)
MF3, 4 OUTDOOR FAN MOTOR (INNER THERMOSTAT)
O. B OUTDOOR CONTROLLER BOARD
SW1, 2, 3<O. B> SELECT SWITCH <CHECK, SERVICE>
T TRANSFORMER
TB1 POWER SUPPLY TERMINAL BLOCK
CONNECTING WIRES INDOOR/OUTDOOR
TB3
TERMINAL BLOCK
LED
YLW
ORN
O.B
LD8
SW1
LD7
LD6
SW2
LD5
LD4
SW3
LD3
OFF
LD2
ON
LD1
2 1
2
CN3
1
CN6T
6 5 4 3 2 1
4
RED
BRN 11.5V AC
208V
RED 15.5V AC
WHT
ORN
ORN 36.0V AC
WHT
230V
T
RED
WHT
RED
WHT
GRN
€
are ¨OFF¨)
SW3
Check display (flush)
TH3 short / open
63H2 functions
TH3 overheat protection
Defective input
Pressing the
NAME
TH3
CN2
X12 X11
X12 X11
F3
ZNR
TRF 52C CH R/1 S/2
BLU
S
A
CH
52C
B
52C
R U
BLU
WHT
T W
BLU
—
—
—
—
€
SW2
White connector
15
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>
R RESISTOR
C5 COMPRESSOR START CAPACITOR
19 COMPRESSOR START RELAY
FC
5
26C
63H2
51CM
T/3
MF4 MF3
BLU
63H2
R
C
MC
RED
S
C
PU42EK2 only
52C
R
U BLU
WHT
WHT
W
T
1
R
19
19 2
BLU RED
3
C5
When power Supply is 208V
208V
RED WHITE
230V
ORANGE
NAME
RED
C3
MF3
ORN
BRN
MF4 C4
YLW
BLU
R
C
MC
C
S
RED