Installation guide

-49-
Design & installation Guide For McQuay MDS Multi System
Outdoor
220V/1~/50Hz
QF
Communication wire
Communication wire Communication wire
Main power 
terminal support
Main power
terminal support
Main power
terminal support
Main power
terminal support
Unit electric control box
Unit electric control box
Main board
Communic-
ation port
Unit electric control box
Main power
terminal support
Unit electric control box
L N
Power
supply
Power
supply
Power
supply
Power
supply
Indoor unit 1 Indoor unit 2
Indoor
220V/1~/50Hz 
220V/1~/50Hz 
220V/1~/50Hz 
220V~/50Hz 
N
L
N
L
N
L
Shielded wire
Notes:
1.The J1 of the control module sets the inside unit number. The first digit 
of indoor unit J2 which is at the end of the bus is set to ON. 
2. For specifications of the power cable, refer to the Installation Manual.
3. To avoid interference of strong electricity to weak electricity, the communication
cables of the power box are distributed separately.
4. The indoor units are powered from the same power supply.
Main board
Communic-
ation port
Main board
Communic-
ation port
Main board
Communic-
ation port
Main board
Communic-
ation port
Unit electric control box
R
S
T
N
N
L
N
L
N
L
N
L
QF
L1 L2 L3 N
380V/3N~/50Hz
220V/1~/50Hz
220V~/50Hz
220V~/50Hz
Unit electric control box
Unit electric control boxUnit electric control box
Power
supply
Power
supply
Power
supply
Power
supply
Notes:
1.The J1 of the control module sets the inside unit number. The first digit 
of indoor unit J2 which is at the end of the bus is set to ON. 
2. For specifications of the power cable, refer to the Installation Manual.
3. To avoid interference of strong electricity to weak electricity, the communication
cables of the power box are distributed separately.
4. The indoor units are powered from the same power supply.
Outdoor
Communication wireCommunication wire Communication wire
Communication wire
Main power
terminal support
Indoor unit 1 Indoor unit 2
Indoor
Shielded wire
Main power 
terminal support
Main power 
terminal support
Main power 
terminal support
Main power 
terminal support
Main board
Main board
Main board
Communic-
ation port
Main board
Communic-
ation port
Main board
Communic-
ation port
Unit electric control box
Unit electric control box
2.7.2 MDS050A/AR MDS060A/AR
2.7 Electric Connection
2.7.1 MDS030A/AR MDS040A/AR MDS050A/AR