Central Remote Controller
Installation Manual
11
-EN
When connecting to a previous model light commercial, air to air heat exchanger, air to water
heat pump, or general purpose equipment control interface
Follow the wiring specifications in the table below even when there is a mix of U series and non-U series in the connected indoor
units or remote controllers.
Wiring specifications
REQUIREMENT
When wiring the control wiring between indoor and outdoor units (Uv line)/control wiring between outdoor units (Uc line) and the
central control wiring (Uh line), use the same wire type and diameter for each line.
Using a mixture of different wire types and diameters may cause a communication error.
System diagram
* The wiring specifications in the system diagram above are the same even when the indoor unit or remote controller are other
than the U series.
Item
Communication line
Central control wiring (Uh line)
Wire diameter
1.25 mm
2
(up to 1000 m)
2.0 mm
2
(up to 2000 m)
Wire type
2-core, non-polar
Wire types that can be used
Shielded wire
U2
U4
U3
U4
U3 U4
U6
U4
U1
Uv
U2
A B
U2
U5 U6
U3 U4
U1
U3 U4
U3 U4
LINK (Uh)
U6
U4
U4
A B
U6
4
Uh
A B
Central control
device
Outdoor unit
and Other
Indoor unit *
Hydro unit
<U series>
Remote
controller *
[Central control wiring (Uh line)]
L1 = Up to 2000 m
[Control wiring between indoor and outdoor units
(Uv line)/Control wiring between outdoor units (Uc line)]
L2 = Up to 1000 m
Light Commercial
Air to air heat
exchanger
General purpose
equipment
control
interface
Air to Water
Heat Pump
TCC-LINK
adapter
Summary of Contents for TCB-SC640U-E
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