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5
WIRING DIAGRAM
PAC-MK53BC
PAC-MK33BC
PAC-MK53BCB
PAC-MK33BCB
SYMBOL
NAME
B.C.
Branch box controller board
F1
Fuse <T6.3AL 250V>
F2~F4
Fuse <T10AL 250V>
SW1
Switch for indoor unit connection
SW4
Switch for function selection
SW5
Switch for function selection
CNM
Connector <Connection for service>
LED1,2
Light emitting diode
TB3A~E
Terminal block <To Indoor unit-A~E>
SW11
Address Setting ones digit
SW12
Address Setting tens digit
LEV-A~E
Linear expansion valve
TH-A~E
Thermistor <Gas pipe>
TB2B
Terminal block <To Power Supply>
TB5
Transmission line
REACTOR BOX
Optional parts
TB2C
Terminal block <To Power Supply>
TB2D
Terminal block <To Branch box (TB2B)>
*
1 F4 for PAC-MK53BC (B) only
*
2 SW1 setting
OFF
SW1-1
INDOOR UNIT-A
NOT CONNECT
SW1-2
INDOOR UNIT-B
NOT CONNECT
SW1-3
INDOOR UNIT-C
NOT CONNECT
SW1-4
INDOOR UNIT-D
NOT CONNECT
SW1-5
INDOOR UNIT-E
NOT CONNECT
SW1-6
NO USE
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.
*
3 SW4 setting
OFF
Cooling & Heating system
Cooling only system
SW4-5
When the outdoor unit is cooling only system, turn
SW4-5 to on.
*
4 Refer to the installation manual of Branch box for details.
<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
B.C.
(PAC-MK53BC (B) only)
5
LEV-E
LEV-E
M
(GN)
1
5
LEV-D
LEV-D
M
(BK)
1
5
LEV-C
LEV-C
M
(BU)
1
5
LEV-B
LEV-B
M
(RD)
1
5
LEV-A
LEV-A
M
(WH)
1
(PAC-MK53BC (B) only)
2 TH-E
TH-E
1 (GN)
tº
2 TH-D
TH-D
1 (BK)
tº
TH-C
2 TH-C
1 (BU)
tº
2 TH-B
TH-B
1 (RD)
tº
TH-A
2 TH-A
1 (WH)
tº
LED1
LED2
OCH664
*
5 LED on Branch box controller board for service
• start-up
Mark
LED 1
Main power supply
*
1
LED 2
*
2
• normal operating
*
3
*
Mark
4
LED 1 Main power supply
*
LED 2 Total number of
5
*
indoor units
6
*
6
*
*
6 D and E for PAC-MK53BC (B) only
6
<Note>
1. At servicing for outdoor unit,
always follow the wiring diagram
of outdoor unit.
2. When work to supply power
ON
CONNECT
separately to Branch box and outdoor
CONNECT
units are applied, refer to Fig. 1.
CONNECT
PAC-MK
However, when the Branch box is
CONNECT
53BC (B)
CONNECT
connected to MXZ-6C/8C∙NAM,
only
power must not be supplied separately.
3. For the connection method, please
refer to the Branch box Installation
Manual.
ON
<Symbols used in wiring diagram>
Indoor unit-C
F1
6.3A 250V
3
–
1
+
CND
(BK)
3
M-NET
CN3M
1
(BU)
F4
10A 250V
*
*
SW4
3
SW1
2
ON
ON
OFF
OFF
1 2 3 4 5 6 7 8 9 10
1 2 3 4 5 6
F3
10A 250V
SW12 SW11
SW5
ON
OFF
1 2 3 4 5 6
10s
1s
DIGIT
DIGIT
F2
10A 250V
14
1
CNM
(WH)
Meaning
Function
Main power supply (220/230/240V)
Power on → Lamps are lit
Meaning
Function
Lamp is lit
Blink depend on the total number
<example> The total number is 2
1 Blink 2 times.
2 Turn off for 3 sec.
3 Repeat 1 to 2 .
: Terminal block,
: Connector
: Dip switch (■ (black square)
indicates a switch position)
Indoor unit-D
Indoor unit-E
TB5
BU
M1
BU
M2
S
TB2B
RD
L
BU
N
TB1
(PAC-MK53BC (B) only)
S3
TB3E
S2
TO
S1
INDOOR
UNIT-E
S3
TB3D
S2
TO
S1
INDOOR
UNIT-D
S3
TB3C
S2
TO
S1
INDOOR
UNIT-C
S3
TB3B
S2
TO
S1
INDOOR
UNIT-B
S3
TB3A
S2
TO
S1
INDOOR
UNIT-A
12
TO OUTDOOR UNIT
DC24-30V
(SHIELD)
TO ANOTHER BRANCH BOX or
M-NET CONTROL INDOOR UNIT
(SHIELD)
REACTOR BOX (optional parts)
7
*
TB2D
TB2C
WH
L
L
BU
N
N
TO OUTDOOR UNIT
BK
*
7 Depending on which
indoor unit is combined
with which outdoor unit,
TO ANOTHER
reactor box should be
installed.
BRANCH BOX
Refer to the installation
manual of branch box or
that of outdoor unit for
details.
Fig. 1
POWER SUPPLY
220/230/240V 50Hz
220/230V 60Hz
CIRCUIT
REACTOR BOX
BREAKER
(optional parts)
*
7
TB2B
TB2D
TB2C
WH
L
L
L
BU
N
N
N
BK
TO ANOTHER
BRANCH BOX,
REACTOR BOX
*
(optional parts)
7
or M-NET
CONTROL
INDOOR UNIT
PULL
BOX
PULL
BOX
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