McQuay MDS080B R Installation Manual page 21

8.3.2 For combined outdoor units
Power
L3 N
L1 L2
Switch
Switch
L1 L2 L3 N L1 L2 L3 N
Fuse
Fuse
Switch
Switch
Two-core cable
Fuse
Fuse
(power circuit)
Note: For MDS320B(R) you can use only the separate connection, other combined units we recommend use the series connection.
Separate electrical connection for
combined outdoor unit(FOR MDS260 ～ 320B(R))
8. 4 Communication cable wiring for indoor and outdoor unit;
As shown as below:
Outdoor unit
Control box
Screen
layer
Main PCB
Connection
port
Communication cable
To network or central
control (optional)
For combined unit:
Outdoor unit
Screen
Master unit
layer
Main PCB
Connection
port
To network or central
control (optional)
Outdoor unit
Master Slave
Two-core cable
(power circuit)
Indoor unit
Indoor unit 1
Control box
PCB
Connection port
A
com1
B A B
Communication cable
Slave unit
Main PCB
Connection
port
Communication cable
L1
Switch
Switch
Fuse
Fuse
Indoor unit 2
Control box
PCB
Connection port
A
com1
A B
B
Indoor unit 1
Control box
PCB
Connection port
A
com1
B
A B
Communication cable
Power
L1 L2 L3 N
Switch
L1 L2 L3 N
Fuse
Outdoor unit
Master
N L1 N
Switch
Two-core cable
Fuse
Two-core cable
(power circuit)
(power circuit)
Indoor unit
Series electrical connection for combined outdoor unit
(FOR MDS260 ～ 300BR)
Control box
Connection port
A
B
Communication cable
Indoor unit 2
Control box
PCB
Connection port
A
com1
B
A B
Communication cable
©2005 McQuay International
20
Slave
L1 N
Switch
Fuse
Indoor unit i
PCB
JP1
com1
A B
1
JP of last unit on
main bus should be on
Indoor unit i
Control box
PCB
Connection port
A
JP1
com1
B
A B
1
JP of last unit on
main bus should be on