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Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
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WIRING
1-Way Cassette TT, TU Chassis
Cable Connections
1. Ensure the input power is disconnected and there is no power on
the power input cable.
2. Refer to Figure 26 and route the power and outdoor unit com-
munications cables to the unit’s terminal block. Do not
route the communications cable near the power cable.
3. Connect the power cable to the 1(L1) and 2(L2) termi-
nal block connections. Ensure the screws
securely connect the wire to the terminals
and are not loose.
4. Connect the field-provided outdoor unit
communications cable to the 3(A) and
4(B) terminal block connections. This
cable must be 18-2, stranded, shielded,
and meet all applicable codes. Polarity
matters on this IDU to ODU communica-
tions bus. Be sure to connect A terminals
to A terminals and B terminals to B termi-
nals. Ensure the communication cable is
properly grounded at the master outdoor
unit only. Do not ground this IDU to ODU
communications cable at any other point.
5. If the unit has a wall-mounted zone controller, connect the con-
troller’s cable to the unit’s remote control connection. On some
units this cable connects to a pigtail cable from the CN-REMO
connector on the control board and on some units it connects
directly to the CN-REMO connector.
Figure 26: Typical TT, TU Chassis Cable Connections
1(L1) 2(L2)
3(A)
4(B)
Power Supply
High Voltage
(208/230V)
Communications
Lock nut
Conduit
mounting
plate
Conduit
DANGER
High voltage electricity is required to operate this system. Adhere to the National Electrical
Codes and these instructions when wiring. Always ground the unit following local, state, and
National Electrical Codes. Read the safety summary at the beginning of this manual.
