Engineering Manual
B-114
5-2. BRANCH BOX
PAC-MKA51BC PAC-MKA31BC
<Note>
1. At servicing for outdoor unit,
always follow the wiring diagram
of outdoor unit.
2.
Caution for electrical work.
• Use copper supply wires.
(Utilisez des fils d’alimentation en cuivre.)
3. When work to supply power
separately to Branch box and outdoor
units are applied, refer to Fig. 1.
4.
For the connection method, please
refer to the Branch box Installation
Manual.
<Symbols used in wiring diagram>
: Terminal block, : Connector
: Dip switch (■(black square) indicates
a switch position)
BU
RD
TO OUTDOOR UNIT
LEV-E
LEV-D
LEV-C
LEV-B
LEV-A
TH-E
tº
TH-D
tº
TH-C
tº
TH-B
tº
TH-A
tº
1 2 3 4 5 6
SW5
ON
OFF
10s
DIGIT
1s
DIGIT
TO
INDOOR UNIT-E
TO
INDOOR UNIT-D
TO
INDOOR UNIT-C
TO
INDOOR UNIT-B
TO
INDOOR UNIT-A
L1
L2
S3
S2
S1
S3
S2
S1
S3
S2
S1
S3
S2
S1
S3
S2
S1
M1
M2
S
TO OUTDOOR UNIT
DC24-30V
TB3E
TB3C
TB3A
TB3D
TB3B
F4
10A 250V
F3
10A 250V
F2
10A 250V
TB2B
TB1
TB5
(SHIELD)
(SHIELD)
CND
(BK)
F1
6.3A 250V
+
–
3
1
M-NET
CN3M
(BU)
5
LEV-E
(GN)
1
5
LEV-D
(BK)
1
5
LEV-C
(BU)
1
5
LEV-B
(RD)
1
5
LEV-A
(WH)
1
2 TH-E
1 (GN)
2 TH-D
1 (BK)
2 TH-C
1 (BU)
2 TH-B
1 (RD)
2 TH-A
1 (WH)
M
M
M
M
M
(PAC-MKA51BC only)
(PAC-MKA51BC only)
0
1
2
3
4
5
6
7
8
9
SW12
0
1
2
3
4
5
6
7
8
9
SW11
ON
OFF
1 2 3 4 5 6 7 8 9
10
SW4
1 2 3 4 5 6
SW1
ON
OFF
LED1
LED2
CNM
(WH)
1
14
B.C.
BU
BU
(PAC-MKA51BC only)
TO ANOTHER
BRANCH BOX
TO ANOTHER
BRANCH BOX
BU
RD
POWER SUPPLY
208/230V AC 60Hz
L1
L2
TB2B
TO
ANOTHER
BRANCH
BOX
CIRCUIT
BREAKER
Fig. 1
PULL
BOX
PULL
BOX
1
2
3
*
2
Indoor unit-D Indoor unit-E
<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.
SYMBOL
B.C.
LEV-A~E
TH-A~E
TB2B
TB5
Branch box controller board
Fuse <UL 6.3A 250V AC>
Fuse <UL 10A 250V AC>
*
1
Switch for indoor unit connection
*
2
Switch for function selection
Switch for function selection
Connector <Connection for service>
Light emitting diode
*
3
Terminal block <To Indoor unit-A~E>
*
4
Address Setting ones digit
Address Setting tens digit
Linear expansion valve
*
4
Thermistor <Gas pipe>
*
4
Terminal block <To Power Supply>
Transmission line
NAME
Indoor unit-A Indoor unit-B Indoor unit-C
*
3 LED on Branch box controller board for service
After each indoor unit is connected to the outdoor unit, turn on
the switch corresponding to each indoor unit. For example,
when the indoor units are connected to INDOOR UNIT-A
and C, turn SW1-1 and SW1-3 to on.
• start-up
Mark
LED 1
LED 2
Main power supply
Meaning
Main power supply (208/230V)
Power on → Lamps are lit
Function
Mark
LED 2 Total number of
indoor units
Meaning
LED 1 Main power supply Lamp is lit
Function
• normal operating
*
4 D and E for PAC-MKA51BC only.
PAC-MKA
51BC only
INDOOR UNIT-A
INDOOR UNIT-B
INDOOR UNIT-C
INDOOR UNIT-D
INDOOR UNIT-E
NO USE
SW1-1
SW1-2
SW1-3
SW1-4
SW1-5
SW1-6
NOT CONNECT
NOT CONNECT
NOT CONNECT
NOT CONNECT
NOT CONNECT
CONNECT
CONNECT
CONNECT
CONNECT
CONNECT
OFF
ON
*
1 F4 for PAC-MKA51BC only
*
2 SW1 setting
F1
F2~F4
SW1
SW4
SW5
CNM
LED1,2
TB3A~E
SW11
SW12