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Message
Running Central AC Gas Heater on a Generator
Posted on 2/14/21 at 4:49 pm
Posted on 2/14/21 at 4:49 pm
i just tried running my central ac unit's gas heater with my generator
for some reason the fan kicks on immediately when i plug it in and doesn't stop
any ideas? could it be a ground issue?
it's an inverter generator with clean enough power to run electronics (i actually looked at the output with an oscilloscope)
for some reason the fan kicks on immediately when i plug it in and doesn't stop
any ideas? could it be a ground issue?
it's an inverter generator with clean enough power to run electronics (i actually looked at the output with an oscilloscope)
4
Posted on 2/14/21 at 5:01 pm to DVinBR
220v?
Posted on 2/14/21 at 5:32 pm to LEASTBAY
120
Posted on 2/14/21 at 7:54 pm to DVinBR
You have 2 electric motors on a HVAC gas furnace - the larger blower motor which distributes heated or cooled air through the ducts - its 220v. The other motor is a small inducer motor 110V, which vents the heated combusted natural gas products outside the house through through a vent, usually from the roof. Which one is running?
Posted on 2/14/21 at 9:27 pm to CrawDude
Wrong
Posted on 2/14/21 at 9:29 pm to DVinBR
Your 100% right it’s either a ground issue or the neutral / hot are reversed. Worse case you should still be able to use the ground from the house.
Posted on 2/14/21 at 9:42 pm to DVinBR
I've never heard of this. Must be fairly small. Is this a small split unit?
Posted on 2/17/21 at 3:16 pm to DVinBR
quote:
i just tried running my central ac unit's gas heater with my generator
for some reason the fan kicks on immediately when i plug it in and doesn't stop
any ideas? could it be a ground issue?
I had an issue with my inverter trying to do that same as you. My fan wouldn't kick on though. My heater is fairly new and apparently picky about the grounding. I had to take off the panels to see the control board was showing an LED error code. The code was for "Ground not connected". I ended up running a pigtail directly to the wire in the breaker panel so I could attach the ground there. Then plugged the pigtail into a cord that ran to the generator. Not the cleanest way to do it, but I was able to heat almost 3,000 sq ft with a 2000 watt generator & gas heat.
Posted on 2/17/21 at 4:07 pm to LEASTBAY
quote:
I've never heard of this. Must be fairly small. Is this a small split unit?
My 5 ton gas furnace runs off of a standard 120v outlet...as well as every house I’ve ever owned
Posted on 2/21/21 at 5:49 pm to jmkidder
yep, the generator's neutral wasn't bonded to the ground, once i did that the unit worked perfectly
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