Mitsubishi Electric PKH18FK Technical & Service Manual page 23

MODELS PUH18EK WIRING DIAGRAM
C COMPRESSOR CAPACITOR
C1 FAN CAPACITOR
F<O.B> FUSE<6A>
FC<O.B> FAN CONTROLLER
HC CRANKCASE HEATER
LD1~LD8 LED<CHECK,SERVICE>
MC COMPRESSOR
MF FAN MOTOR<INNER THERMOSTAT>
O.B OUTDOOR CONTROLLER BOARD
1 YLW
FROM INDOOR UNIT
2
ORN
CONNECTING WIRES
3 BRN
12V DC (polar)
TB3
BRN 12.3V AC
RED 12.3V AC
L1
POWER SUPPLY
L2
1{ 208/230V
GR
60Hz
Main function of LED(when both Nos.1 and 2 of
LED NO. Output display (light)
LD1 Compressor indoor command
LD2 Heating indoor command
LD3 63H1
LD4 Compressor
LD5 Outdoor fan
LD6 R.V.coil
LD7 Bypass valve
LD8 Crankcase heater
NOTES : 1. If the operation stops to function of the protection device, the check display flashes.
2. Symbols used in wiring diagram above are. / :Terminal block, ¤¤¤ :Connector, ¤ :PC board insertion tab.
CAUTION FOR SERVICING
s
The connector marked —¤— 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 in the right figure.
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.
RT
SW1•2•3<0.B>
T
TB1,3
X11<O.B>
X12<O.B>
X13<O.B>
LED
RT
O.B
SW1
CN2
SW2
SW3
OFF
ON
X14
2 1
3
2
CN3
1
CN4T
4
4 3 2 1
SV TRF
21R
RED
208V
WHT
ORN
WHT
230V
T
RED
BLK
TB1
52C
R
RED
BLK
T
GRN
SW3
Check display (flash)
ON RT short/open
ON 63H2 funcitons
ON
ON
ON RT overheat protection
ON Defective input
OUTDOOR COIL THERMSTOR
<32˚F/15kΩ,77˚F/5.4kΩ>
SELECTOR<CHECK,SERVICE>
TRANSFORMER
TERMINAL BLOCK
CRANKCASE HEATER RELAY
COMPRESSOR RELAY
R.V RELAY
4 3 2 1
X14 X13 X12 X11 CN4
X13 X12 X11
21S4 52C CH ZNR
S
A
21
HC
52C
S4
B
U BLU
R
51C
WHT 2 1 WHT
C
W
BLU RED
S
C
are "OFF")
How to use SW1 and 2
—
—
—
—
X14<O.B> BYPASS VALVE RELAY
ZNR<O.B> VARISTOR
21R BYPASS VALVE COIL
21S4 R.V COIL
51C OVERCURRENT RELAY
52C CONTACTOR
63H1
CONTROL HIGH PRESSURE SWITCH
63H2 PROTECT HIGH PRESSURE SWITCH
5
63H1
F
R/1 S/2
T/3
BLU BLU
63H1
MC
Pressing SW1 erases the past check contents
loaded on the microcomputer.
The output display (light) remains during opera-
tion but pressing SW2 displays the past check
contents in flashing mode. Pressing the switch
again retums to output display (light).
White connector
w
When Power Supply is 208V
RED
ORANGE 230V
FC
26C
MF2
63H2
MF1
51CM
63H2
BLU
4
WHT
3
RED RED
MF
2
C1
1
ORN ORN
WHITE
208V
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