Design Of Control Wiring - Toshiba MCY-MHP0404HT-E Engineering Data Book

4
Wiring design

4-5. Design of control wiring

4-5-1. Summary of control wiring
Central controller
U1 U2
U3 U4
Open
Control wiring and central control wiring use 2-core non-polarity wires.
Use 2-core shield wires to prevent noise trouble.
In this case, for the system grounding, close (connect) the end of shield wires, and isolate the end of terminal.
Use 2-core non-polarity wire for remote controller. (A, B terminals)
Use 2-core non-polarity wire for wiring of group control. (A, B terminals)
Outdoor unit
U1 U2 U3 U4
Control wiring between indoor and outdoor unit
(Shield wire)
Control wiring between indoor units (Shield wire)
U1 U2 A B
Indoor unit Indoor unit
A B
Remote controller
U1 U2 A B U1 U 2 A B
Indoor unit
A B A B
Remote controller
Remote controller
(Group control)
26
U1 U 2 A B
Indoor unit