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I have a wall heater. I am installing a new 240 Line voltage…

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I have a wall heater...
I have a wall heater. I am installing a new 240 Line voltage thermostat, Single pole. I was dumb and unhooked the old thermostat wires before labeling them. The white is already hooked up(white to white). My problem comes that the other 2 wires in the wall box are black. How do I find out which wire is Power and which is Heater?
Submitted: 2 years ago.Category: HVAC
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Answered in 3 minutes by:
2/1/2016
HVAC Technician: airheatman, HVAC Technician replied 2 years ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 9,376
Experience: Furnace, A/C and heat pump specialist.
Verified

If you have a volt meter we can check between White and each black to see which has power on it.

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HVAC Technician: airheatman, HVAC Technician replied 2 years ago

That is the proper way to determine.You can get an inexpensive meter at Walmart for about 15 bucks if you do not have one.

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