How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask airheatman Your Own Question
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8264
Experience:  Furnace, A/C and heat pump specialist.
16514686
Type Your HVAC Question Here...
airheatman is online now
A new question is answered every 9 seconds

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

Customer Question

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: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

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

Expert:  airheatman replied 1 year 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.