Trane Foundation EBC180, Installation, Operation And Maintenance Manual

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1. Use copper conductors unless otherwise specified.
2. Ensure that the AC control wiring between the
controls and the unit’s termination point does not
exceed three (3) ohms/conductor for the length of
the run.
N No otte e:: Resistance in excess of 3 ohms per conductor
could cause component failure due to
insufficient AC voltage supply.
3. Be sure to check all loads and conductors for
grounds, shorts, and mis-wiring.
4. Do not run the AC low voltage wiring in the same
conduit with the high voltage power wiring.
5. Route low voltage wiring as per Figure 14, p. 21 .
Table 2. Electromechanical thermostat 24V AC conductors with electromechanical unit
Distance from Unit to Control Recommended Wire Size
0 - 30 feet
22 gauge
0 - 9.1 m 0.33 mm^2
31 - 50 feet
20 gauge
9.5 - 15.2 m 0.50 mm^2
51 - 75 feet
18 gauge
15.5 - 22.9 m 0.75 mm^2
76 - 125 feet
16 gauge
23.1 - 38.1 m 1.3 mm^2
126 - 200 feet
14 gauge
38.4 - 60.9 m 2.0 mm^2
Figure 14. Conventional thermostat field wiring diagram
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