Mitsubishi Electric MXZ-8A140VA1 Technical & Service Manual page 24

7-2. BRANCH BOX : PAC-AK50BC PAC-AK30BC
Note : " PAC - AK30 . 50BC, PAC - AK31 . 51BC " is only for R410A.
SYMBOL
B.C Branch box controller board
F1 <B.C> Fuse 250V 6.3A
SW1<B.C> Switch for service
CNM<B.C> Connector
LED1~5< B.C> Light emitting diode
LEV - A~E
Linear expansion valve
TH - A~E
Thermistor
Pipe temp.detection / Gas
(0 / 15k , 25
TB2B Terminal block / To outdoor unit
Terminal block / To indoor unit - A
TB3A
Terminal block / To indoor unit - B
TB3B
Terminal block / To indoor unit - C
TB3C
Terminal block / To indoor unit - D
TB3D
Terminal block / To indoor unit - E
TB3E
Note
1. At servicing for outdoor unit, always follow the wiring diagram of Outdoor unit.
2. Symbols used in wiring diagram above are,
(Combination of indoor units)
Enter the location of combined indoor units with model name in each
blank below because it is necessary for service and maintenance.
Indoor unit - A Indoor unit - B Indoor unit - C Indoor unit - D Indoor unit - E
Setup of SW1
Make it the same setup as former
when exchanging PCB.
(PAC - AK50/51BC only)
TB3E
S1
TO INDOOR
S2
UNIT - E
S3
(PAC - AK50/51BC only)
TB3D
S1
TO INDOOR
S2
UNIT - D
S3
TB3C
S1
TO INDOOR
S2
UNIT - C
S3
TB3B
S1
TO INDOOR
S2
UNIT - B
S3
TB3A
S1
TO INDOOR
S2
UNIT - A
S3
TB2B
S1
TO OUTDOOR
S2
UNIT
S3
PAC-AK51BC PAC-AK31BC
NAME
/ 5.4k )
The black square (
ON
OFF
SW1
YLW
5
TB3E
ORN
3
(GRN)
BRN
1
YLW
5
ORN TB3D
3
(BLK)
BRN
1
YLW
5
ORN TB3C
3
(BLU)
BRN
1
YLW
5
ORN TB3B
3
(RED)
BRN
1
YLW
5
ORN TB3A
3
(WHT)
BRN
1
YLW
ORN
1
CN3C
BRN
(BLU)
3
3 F1
CND
(ORN)
1
TB1
: terminal block, : connector.
■
) indicates a switch position.
LED1 LED2 LED3 LED4 LED5
1 2 3 4 5 6 7
8 9 10 11 12 13 14
CNM
24
B.C
1
TH-A
TH - A
(WHT) 2
1
TH-B
TH - B
(RED) 2
1
TH-C
TH - C
(BLU)
2
TH-D 1
TH - D
(BLK)
2
(
1
TH-E
TH - E
(GRN)
2
LEV - A
6
1
LEV-A
(WHT) 6
LEV - B
6
1
LEV-B
(RED) 6
LEV - C
6
1
LEV-C
(BLU) 6
LEV - D
6
1
LEV-D
(BLK) 6
(PAC - AK50/51BC only)
LEV - E
6
1
LEV-E
(GRN) 6
PAC - AK50/51BC only
)