Johnson Controls YVAHP072B31S, Service Manual

Page: 323 / 1796

Service Manual
1-307
INSTALLATION
8.2.3 Electrical Wiring for Indoor Unit
Refer to the “Installation and Maintenance Manual” for the outdoor unit for details on the electrical wiring
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outdoor unit.
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(2) Connect the communication cables between the indoor unit and the outdoor unit correctly.
Check to ensure that the terminal for power supply wiring (Terminals “L1” to “L1” and “L2” to “L2” for
each terminal block: AC208/230V) between the indoor unit and the outdoor unit correspond correctly.
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the communication cable between the outdoor unit and the indoor units. They are connected to the
terminals 1 and 2 of the terminal blocks. The controller cable is connected to the terminals A and B of
each indoor unit terminal block.
(4) The total cable length should not exceed 3281ft (1000m).
NOTE:
The total wiring length for the wired controller can be extended up to 1640ft (500m). If the total wiring
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(1) Connect the power supply wirings (L1 and L2) to the terminal block correctly.
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< In Case of Using an Optional Wired Controller or Optional Receiver Kit >
The following setting is required when the optional wired controller
or the optional receiver kit is used.
x
The setting before shipment is “Wireless”. Set SW2 to “Wired”.
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x
Connect the controller cables to the terminals A and B at the terminal block TB2.
< In Case of Using an Optional Wireless Controller >
x
The SW2 switch setting is NOT required when the wireless controller is used with the receiver built into
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used with the receiver built into the indoor unit. If the multiple indoor unit's operation is required with this
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x
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should be set to “B mode”. (Refer to the “Installation and Maintenance Manual” for the wireless controller
about the “B mode” setting.)
A B 1 2
L1
Controller
Line
Communication
Line
Power Supply Line
TB2
TB1
L2
A B 1 2
L1 L2
Controller
Line
Power Supply Line
Communication
Line
TB2
TB1
Wired
Wireless
SW2
DIP Switch PCB
Change to “Wired” .
NOTICE