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MattOverMinder 01-22-2009 10:13 PM

Quick HVAC / sump pump wiring question
Hi, my 1962 house has a gas powered furnace and the interior unit for the heater / AC is hardwired into a dedicated 120v 20A circuit (being gas fired, this is basically just a big blower). Next to the unit is a small sump pump that spits the condensation from the unit out through the side of the house. The pump is plugged into an outlet that's on a 15A circuit that powers several other receptacles on that side of an unfinished basement. The pump is also wired into the AC unit in order to shut it down if the pump fails.

I'm planning on doing some rewiring and some re-purposing of the circuits in the area and I'd like to put the pump on the same 20A circuit as the AC unit. The AC circuit passes through a standard light switch that serves as a disconnect and the outlet that the pump is plugged into is directly beneath it. Having checked the specs on both, the pump is rated at 1.4A draw and the AC unit at 12A max, so load wise the combined 13.4A shouldn't be a problem. My question is... is there a code reason why I can not do this?



Reilley 01-22-2009 10:20 PM

Not sure on the code requirement but my condensate pump is wired into my furnace rather than an outlet. This may be an option with either your furnace or AC also. I'm guessing you meant condensate pump and not sump pump.

MattOverMinder 01-22-2009 10:31 PM

Yes, I meant the condensate pump... I think that I just like to say "sump pump". It's fun, you should try it. :laughing:

The pump has a standard plug on it and I don't immediately see a place to hard wire it, but I haven't looked that closely either.

micromind 01-23-2009 12:44 AM

2005 NEC 422.12 "Central heating equipment other than fixed electric space heating equipment shall be supplied by an individual branch circuit."

Exception #1 "Auxiliary equipment, such as a pump, valve, humidifier, or electrostatic air cleaner directly associated with the heating equipment, shall be permitted to be connected to the same circuit."

Obviously you can, and in my opinion, should, connect the condensate pump to the furnace circuit.


MattOverMinder 01-23-2009 07:42 AM

Thanks! That is the answer I'm looking for.

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