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Method to Connect Wires
1. Make connection between PI 485
installed on the outdoor unit and central
controller.
2. To supply power to the central controller,
supply it from the terminal block Vcc and
GND terminal of PI 485 or supply it
through a separate DC 10V power supply
unit.
• Where more than 2 central controllers
are installed, refer to system wiring
drawing. (See page 6)
CAUTION:
1. For supplying DC10V power from PI 485, power supply is permitted up to 3
central controllers per PI 485. When supplying power to more than 3 central
controllers, failure may occur in operation of the central controller.
2. For expanding and connecting PI 485 communication lines C, D up to 16
central controllers can be connected. (In case if functional controller is also
connected, then only 8 controllers can be connected.)
3. Use the 0.75 Square Shield wires for connection wires between PI485 and
central controller wires.
4. For length of connection wires, observe the following regulations.
- Length of connection wires between central controllers: Less than 1m
- Length of connection wires between outdoor unit and central controller:
Less than 200m
- Length of whole connection wires: Less than 1Km.
Method to Connect Wires
Central controller
Central
controller PI 485
VCC
10V
GND
GND
C
BUS-A
(PI 485)
D
BUS-B
Outdoor unit
Installation Manual 13
- Quick Links:
- Central Controller
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