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Wiring a generator transfer switch to a gas furnace

transfer switch gas furnace_install

I have a series of videos I’ll be uploading over the course of the next week regarding the wiring and install of the Heezy HTS15 transfer switch.


Today the video is how to wire a generator transfer switch to a gas furnace. If you have done any electrical work before, this video might be a little slow and seem simple. It’s over 30 minutes long and I’ve tried going into detail about everything you need to know about wiring a generator transfer switch to a gas furnace.

The video;

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  1. Justin says:

    I have a bryant 90 plus furnace that also has a condensation pump. Would I just need to run another extensions cord for the pump to the generator? Also does the transfer switch clean up the power from the generator? How big of risk is there in frying the cicrcuit board or other electrical parts? Very nice tutorial-very throrough for the average electrician.

    1. Rick says:

      Yes, if the condensate pump gets it’s power separate than the furnace than you’ll want to power that too otherwise you will have a mess to deal with and the condensate is acidic so it’s not fun to clean up. The transfer switch doesn’t clean up the power, I’ve addressed this before not sure if it’s posted here or not but their is little to no risk of problems powering from a generator, just don’t run out of gas while the furnace is running or shut the generator off, this could cause a power fluctuation that might blow a fuse or trip the low voltage breaker on the control board.

  2. Herman Kophoff says:

    How do I wire a transfer switch when using a Inverter instead of an generator. I am concerned about floating ground.

    1. Rick says:

      hi Herman, I’ve done some posts about using inverters, wiring is no different then wiring anything else, just be sure to ground your inverter. Some inverters require the neutral to be switched and some may only work if the neutral and ground are bonded together. “Generally” floating grounds require the Neutral wire to be unswitched, basically you would keep this bonded to the ground as well as it would normally be wired in a breaker panel. I hope that makes sense, Floating ground generators usually produce a higher quality of power like the Honda Eu series, and it’s what I use…

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About Rick

I've been an HVAC/R Mechanic working in the Seattle area for over 15 years, specializing in the commercial service industry.. I’m also a Licensed Electrician & Gas Piping Mechanic and have numerous other trade related certifications. I’ve instructed at local trade schools and now continue teaching through this site.

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