Question about Heating & Cooling
If you are certain that the heater has only two wires and that it is a 240 volt unit, here's what you do:
Bring in a 240 volt line. There are three wires. The red and black are the opposite phases and are each 120 volts above ground/neutral. Connect them to the load wires. If there is a neutral, connect that to the white wire, even if it is bare wire. Bare wire and white are the same for all practical purposes. If the unit has a fan, it will run on the neutral/white and one of the phases. Wire sizing is important. Make sure you have a properly sized wire for the job Up to 20 Amps, use #12 wire. If over 20 Amps rated, use #10. Fuse appropriately.
Make sure the power is off when doing this work! 240 will KILL YOU.
Posted on Nov 23, 2008
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Posted on Jan 02, 2017
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