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Electrical Wiring
Due to our policy of continuous product innovation, some specifications may change without notification.
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Figure 54: Space II Unit to Indoor Unit Communications Cable Termination Detail.
Communication Cables Between the Space II Unit and the Indoor Units
The terminal tagged “GND” on the Space II unit PCB is not an earth ground terminal. It is a neutral (-) terminal provided to connect the Space
II unit to central control devices.
• Field Provided 18 Gauge Stranded Two-core
Cable (Shielded)
• Insulation material as recommended by local
code.
Communication Cables Between the Space II Unit and the Controllers
• AC Ez or Simple Central Controller: field-provided, 18 gauge, stranded four-conductor communication cable (shielded).
• All other Central Controllers: field-provided, 18 gauge, stranded two-conductor communication cable (shielded).
• Insulation material as recommended by local code.
Connect all central control devices such as AC Smart II, AC Smart Premium, ACP, BACnet and LonWorks gateways, and energy recovery
ventilators all on the same cable. Order does not matter. Polarity does. Keep “A” terminals with “A” terminals, and “B” terminals with “B”
terminals. Starting at the Space II unit, terminate the cable on terminals Internet A and Internet B. Route the cable as needed between each
device.
Connect the shield to ground ONLY at the Space II unit. Tie shields together at each termination point.
Between Space Unit and Indoor Units
IDU BSODU B
INT B
SODU A IDU A
INT A
TR / TQ Cassette Frames and
All Other Indoor Unit Styles
TM / TN / TP Cassette
Frames Only
1(L1) 2(L2) 3(A) 4(B)
1(L1) 2(L2) 3(L1) 4(L2)
6(B)5(A)
DRY 1 DRY 2 GND
12V
ELECTRICAL WIRING
Communications Cables
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