Wiring
Low Voltage
Figure 8: Typical Field Wiring |
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Note: | CTA180B/S(C,I)RH120 | |
1. Wiring shown with dashed lines is to | CTA180B/S(C,I)RH150 | |
be furnished and installed by the cus- | Field Wiring: | |
tomer. All customer supplied wiring | ||
A — 2 power wires. Line voltage for | ||
must be copper only and must con- | ||
single phase | ||
form to NEC and local electrical codes. | ||
B — 3 power wires. Line voltage for | ||
Codes may require line of sight be- | ||
3 phase | ||
tween disconnect switch and unit. | ||
C — Cooling only thermostat: 4 wires, | ||
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CTA090A/S(C,I)RH030 | 24 volts. | |
CTA090A/S(C,I)RH050 | D — 3 control wires, 24 volts. | |
CTA120A/S(C,I)RH075 |
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CTA120B/S(C,I)RH100 |
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Field Wiring: |
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A — 2 power wires. Line voltage for single phase
B — 3 power wires. Line voltage for 3 phase; 2 wires for single phase
C — Cooling only thermostat: 3 wires,
24 volts.
—Digital thermostat: add 1 addi- tional wire, 24 volts.
D — 2 control wires, 24 volts.
WARNING:
Hazardous Voltage w/Capacitors! Disconnect all electrical power, including remote disconnects and discharge all motor start/run ca- pacitors before servicing. Follow proper lockout/tagout procedures to ensure the power cannot be in- advertently energized. Verify with an appropriate voltmeter that all capacitors have discharged. Fail- ure to diconnect power and dis- charge capacitors before servicing could result in death or serious injury.
Note: For additional information regarding the safe discharge of capacitors, see
Determine proper wire sizes and unit protective fusing requirements by referring to the unit nameplate. Field wiring diagrams for accessories are shipped with the accessory.
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