System wiring diagram
Indoor unit / FS unit
power supply
208/230 V-1-60Hz
Circuit breaker
Pull box
EN-21
Outdoor unit
Headr outdoor
U1 U2 S U3U4 U5 U6 S
Control wiring between indoor and outdoor units
Indoor unit
Indoor unit
Ground
Ground
L1
L2
U1
U2
A
B
Disconnect
Disconnect
switch per
switch per
A
B
NEC
NEC
Remote control
Pull box
Communication
wire
FS unit
FS unit
A
B
1 L
L
2
1 L
2 L
Ground
Ground
Disconnect
Disconnect
switch per
switch per
NEC
NEC
Pull box
Pull box
11
Outdoor unit
Follower outdoor
U1 U2 S U3 U4 U5 U6 S
Control wiring between outdoor units
Control wiring between indoor units
Indoor unit
Ground
1 L
2 L
U1
U2
A
B
1 L
2 L
U1
U2
Disconnect
switch per
A
B
NEC
Remote control
Remote control
Pull box
Pull box
Communication
Communication
wire
wire
FS unit
A
B
A
B
1 L
2 L
Ground
Disconnect
switch per
NEC
Pull box
Indoor unit
Ground
A
B
1 L
2 L
U1
U2
A
B
Disconnect
switch per
A
B
NEC
FS unit
Disconnect
switch per
NEC
A
B
L1 L2
Ground
Pull box
EN-22