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Using an existing 4 conductor wire to supply a 220 v surface mounted heater with electric fan

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We have a Lions Club storage building that basically froze inside during the last cold snap. There is a metal clad cable with four conductors inside it. The heating unit does not have remote thermostat and there is no adjustable thermostat on the unit. We’re not convinced it was getting the full 220 V, and the also the unit was shutting off at too low of a temp.

The line to the heating unit has a red and black, both hot, a white neutral and a green ground. The heater just has a red and...

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