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Dayton 3ph 208V heater # 2yu72 not firing off - WHY?

Hello - let me get to the point. I am an electrician and have replaced the contactor at the belly of the unit due to overheating and one of the phase wires dissconnecting from the contactor by melting. I bypassed the contactor by sliding up the manual contactor override and the unit works fine. Everything checks out with the thermostat but it still will not fire off. Just wondering what else I should be looking for to get this thing going and me on to another project. Any help would be greatly appreciated!! Thank you againg for your time.

Justin

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I assume you mean its not Heating by not firing? If its 3 phase you may have lost 2/3's of your heat not just 1/3. Look at the safety's and find if 1 or more are open. Also there is a fuse able link on most elements and if you have had the heater try to run without a blower lately (or anytime in the past) the link may be out. These are usually installed where they "see" the heaters. If you have power to all the elements look for this or a bad element(s).

If your contactor is still not pulling in check for open safety's or bad timer.

Posted on Mar 04, 2009

  • john094 Jan 18, 2011

    I too am an electrician as the above comments. I have the same problem with one phase wire melting off, is this an ongoing problem? I would like to replace the contactor, Can you tell me where I can buy one? John

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