Wiring Diagram - Mitsubishi MXZ-8B140VA Technical & Service Manual

6

WIRING DIAGRAM

MXZ-8B140VA MXZ-8B160VA
SYMBOL NAME
Terminal Block <Power Supply, Branch Box>
TB1
MC Motor for Compressor
MF1, MF2 Fan Motors
21S4 Solenoid Valve <Four-Way Valve>
63H High Pressure Switch
63L Low Pressure Switch
63HS High Pressure Sensor
Solenoid Valve <Bypass Valve>
SV1,SV2
TH3 Thermistor <Outdoor Pipe>
Thermistor <Compressor>
TH4
Thermistor <Outdoor 2 - Phase Pipe>
TH6
Thermistor <Outdoor>
TH7
DCL Reactor
CB Main Smoothing Capacitor
CY1,CY2 Capacitor
P. B. Power Circuit Board
Connection Terminal <U / V / W - Phase>
U / V / W
LI / NI Connection Terminal <L / N - Phase>
P2,N2 Connection Terminal <CB>
DCL1,DCL2 Connection Terminal <DCL>
IGBT Power Module
EI,E2,E3,E4 Connection Terminal <Ground>
52C Relay
52C
C. B. Controller Circuit Board
SW1 Switch <Forced Defrost, Defect History
Record Reset>
SW2 Switch <Self Diagnosis Switch>
Switch <Test Operation>
SW4
Switch <Function Switch>
SW5
Switch <Model Select>
SW6
SW7 Switch <Function Setup>
SW8 Switch <Function Setup>
SW9 Switch <Function Setup>
CN31 Connector
CN51 Connector <Connection for Option>
SS Connector <Connection for Option>
CN3S Connector <Connection for Option>
CNIT Connector <Connection for Option>
CNDM Connector <Connected for Option
(Contact Input)>
LED3 Light Emitting Diode
<Operation Inspection Indicators>
F1 ~ F4 Fuse <T6.3AL250V>
X51,X52,X54,X55 Relay
*1 MODEL SELECT
The black square ( ) indicates a switch position.
MODEL SW6
1 2 3 4 5 6 7 8
140V
ON
OFF
1 2 3 4 5 6 7 8
160V
ON
OFF
Operation / Inspection Display
LED on the controller board display the operation and inspection status as follows.
If LED does not light, it indicates that no power is supplied to the board:
Power turned on
Normal status
63L connector (red) is open.
Faulty status
63H connector (yellow) is open.
(blinking)
2 connectors (63H/63L) are open.
Branch box/outdoor communication error (Signal receiving error)(Outdoor unit)
Indoor/branch box communication error (Signal receiving error)(Branch box)
Branch box/outdoor communication error (Transmitting error)(Outdoor unit)
Indoor/branch box communication error (Transmitting error)(Branch box)
•Mis-Wiring of indoor-branch box / branch box-outdoor unit connecting wire.
•Too many indoor units / branch box are in the system.
Mis-wiring of indoor-branch box/branch box-outdoor unit connecting wire (converse wiring or disconnection)
Startup time over
Communication error except for outdoor unit
Combination errer, undefined error
Serial communication error
Cautions when Servicing
WARNING:When the main supply is turned off, the voltage[340 V]in the main capacitor will drop to 20 V in approx. 2 minutes (input voltage : 240 V). when servicing, make sure that LED on the outdoor circuit board goes out,
●
and then wait for at least 1 minute.
Components other than the outdoor board may be faulty : Check and take corrective action, referring to the service manual. Do not replace the outdoor board without checking.
●
OCH480D
C. B.
MF1
CNF1
1
(WHT)
MS 7
3~
CNF2
MF2
1
(WHT)
7
MS
3~
3
2
1
CNDC
(PNK)
F2
CNS
(WHT)
F1
3 1
WHT
CB
RED
Details Code
(blinks)
Operation status display,
such as C5. H7
F3
F5
F9
E8
E9
EA
Eb
Ec
E0 - E7
EE, EF
Ed
63H 63L
63HS
TH7 TH6 TH3 TH4
t° t° t° t°
1 4 1 2 2 1 1
TH7/6 TH3 TH4 63HS
(RED) (WHT) (WHT) (WHT)
1 3
63L
(RED)
1 3
63H
(YLW)
CN4
CN2
(WHT)
(WHT)
1 2
1 7
TRANS
2
7
F3
CNAC
(WHT)
2
1
F4
3 1
21S4
(GRN)
3 4
21S4
2
1 2 7
1
CN2
CN4
(WHT)
(WHT)
N2
P2
W V U DCL2 DCL1
DCL
V
W
U
MS
3~
MC
Compressor temperature fault
Low-discharge superheating fault, Erroneous connection of refrigerant pipes or
the connecting wires
High pressure fault (63H operates)
Low pressure fault (63L operates)
Abnormality of power moduls
Compressor over current shutoff (Start up locked)
Current sensor fault (P. B.)
Compressor overcurrent shutoff fault
Compressor thermistor (TH4) open or short-circuit
Outdoor unit thermistors (TH3, TH6, TH7, and TH8), 63HS, and branch dox
thermistors open or short-circuit
Radiator panel temperature fault
Abnormality in outdoor fan motor
Voltage fault, current sensor fault
Forced compressor stop
(Overlap malfunction of drain pump in indoor unit
and linear expansion valve in branch box)
18
The black square ( ) indicates
a switch position.
w1
3 5
1
CNIT
(RED)
1 14
CNM
CN31
(WHT)
CN52C
LED3
1
(RED)
1 3
3
1
3
3
1
5
3 1 3 1 3 1
SV2 SV1 SS
(BLU) (GRY) (WHT)
SV2 SV1
3
CN52C
(RED)
1 3
52C
52C
2
CNDC
(PNK)
3
1
IGBT
E4
EI
NI
L N S1 S2 S3
BRANCH BOX
POWER SUPPLY
~/N
220/230/240V 50H
Z
220V 60H
Z
Details
U2
U7
U1
UL
U6
UF
UH
UP
U3
U4
U5
U8
U9
PA
P. B.
BLK
1
3 BLK
1
3
LI
CY1
CY2
TB1
Code