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MXZ-8B140YA MXZ-8B160YA
SYMBOL
NAME
TB1
Terminal Block <Power Supply>
Terminal Block <Branch Box>
TB2
MC
Motor for Compressor
Fan Motors
MF1, MF2
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
TH6
Thermistor <Outdoor 2 - Phase Pipe>
Thermistor <Outdoor>
TH7
ACL1~ACL4
Reactor
Main Smoothing Capacitor
CB1, CB2
Capacitor
CK
Rush Current Protect Resistor
RS
CY1,CY2
Capacitor
Power Circuit Board
P. B.
TB-U/V/W
Connection Terminal <U / V / W - Phase>
TB-L1/L2/L3 Connection Terminal <L1/L2/L3-Power Supply>
Connection Terminal
TB-P2
TB-C1
Connection Terminal
TB-N1
Connection Terminal
IGBT
Power Module
52C Relay
X52A
Noise Filter Circuit Board
N. F.
Connection Terminal <L1/L2/L3/N-Power Supply>
LI1/LI2/LI3/NI
Connection Terminal <L1/L2/L3/N-Power Supply>
LO1/LO2/LO3/NO
Connection Terminal <Ground>
GD1, GD3
Controller Circuit Board
CONV.B.
Connection Terminal <L1-Power Supply>
L1-A1 / IN
L1-A2 / OU
Connection Terminal <L1-Power Supply>
L2-A2 / OU
Connection Terminal <L2-Power Supply>
Connection Terminal <L3-Power Supply>
L3-A2 / OU
N-IN
Connection Terminal <N-Power Supply>
Connection Terminal <CK>
CK-OU
C. B.
Controller Circuit Board
Switch <Forced Defrost, Defect History
SW1
Record Reset>
Switch <Self Diagnosis Switch>
SW2
SW4
Switch <Test Operation>
Switch <Function Switch>
SW5
SW6
Switch <Model Select>
SW7
Switch <Function Setup>
Switch <Function Setup>
SW8
SW9
Switch <Function Setup>
CN31
Connector
CN51
Connector <Connection for Option>
SS
Connector <Connection for Option>
Connector <Connection for Option>
CN3S
CNIT
Connector <Connection for Option>
Connector <Connected for Option
CNDM
(Contact Input)>
LED3
Light Emitting Diode
<Operation Inspection Indicators>
F1 ~ F4
Fuse <T6.3AL250V>
Relay
X51,X52,X54,X55
*1 MODEL SELECT
The black square ( ) indicates a switch position.
MODEL
SW6
1 2 3 4 5 6 7 8
140Y
ON
OFF
1 2 3 4 5 6 7 8
160Y
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[540 V]in the main capacitor will drop to 20 V in approx.5 minutes (input voltage : 380 V). when servicing, make sure that LED on the outdoor circuit board goes out,
●
and then wait for at least 5 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)
7
MS
3~
CNF2
MF2
1
(WHT)
7
MS
3~
3
1
2
CNDC
(PNK)
F2
CNS
(WHT)
F1
3
1
TB2
S1
S2
BRANCH
BOX
S3
TB1
RED
L1
POWER
WHT
L2
SUPPLY
3N
~
380/400/415V
L3
50H
Z
N
GRN/YLW
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)
CN2
(WHT)
(WHT)
1
7
TRANS
2
7
F3
CNAC
(WHT)
1
2
F4
3
1
21S4
(GRN)
3
4
21S4
7
3
P. B.
1
3
7
1
CN2
CN7
(WHT)
(WHT)
2
2
CN4
(WHT)
1
2
2
CN5
(RED)
1
X52A
RED
RED
TB-P2
N. F.
CNAC1
(WHT)
3
1
LI1
LI2
LI3
BLK
NI
BLU
GD1
GD3
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), 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)
19
The black square ( ) indicates
a switch position.
w1
3
5
1
CNIT
(RED)
1
14
CNM
CN31
(WHT)
CN4
LED3
1
1 2
3
1
3
1
5
3
1
3
1
3
1
SV2
SV1
SS
(BLU)
(GRY)
(WHT)
SV2
SV1
IGBT
TB-W
MC
BLK
W
TB-V
WHT
V
MS
3~
U
RED
TB-U
TB-L3
BLK
TB-L2
WHT
TB-L1
RED
TB-C1
TB-N1
3
3
1
CB1
CB2
CK
2
CNCT
CNAC2
(RED)
(RED)
1
1
3
2
LO1
RED
LO2
WHT
LO3
BLK
NO
BLU
1
3
3
1
CNDC
CNL
(PNK)
(BLU)
2
Details
CONV. B.
ACL1
ACL2
ACL3
ACL4
Code
U2
U7
U1
UL
U6
UF
UH
UP
U3
U4
U5
U8
U9
PA
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Troubleshooting
