Yes, a 120 volt circuit for the gas furnace is usually correct. 14 or 12-2wg is correct wiring. Do verify on the nameplate. The outside unit circuit is usually 240 volts only + ground w/o a neutral for 120 volts. Also, the outside unit circuit is sized for that unit only.
--- In DoIt_Yourself@yahoogroups.com, Mike Shoaf <mike.shoaf@...> wrote:
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> check the nameplate on the furnace for voltage and amperage; most gas furnaces I have dealt with only need 120-volts and a minimum of 15 amps, thus a 14-2 NM cable with a good ground. the condenser unit outside requires its own dedicated 240-volt circuit. if in doubt, call an electrician to check it out!
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> ________________________________
> From: Ron Johnson <l0c0l0b0@...>
> To: doit_yourself@yahoogroups.com
> Sent: Monday, August 27, 2012 1:46 PM
> Subject: [DIY] Furnace wiring
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> I have bought a building and there is an old Heil furnace (Model Number NUGE080GK01) in the basement. I already know that there is a lot to do on this (like rerunning the gas vent exhaust), but right now I need to wire up the unit. It looks like they had a double-30 amp circuit with a 10/3 equivalent (actually they ran an outdoor wire which looks like a 10/2 and then added a single wire for the common). I had to remove a bunch of wires from the old circuit breaker box and now realized I missed rewiring the furnace. Is a 10/3 on a double 30 amp circuit what I need? There is another unit outside that is already powered by a double 30 amp circuit breaker box so I am wondering if I can just splice off that. As you might be able to tell, I don't know much about HVAC systems.
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