To avoid these ads, REGISTER NOW!

Reznor WMO furnace switch?

RonRock

Well-known member
Joined
Oct 6, 2007
Messages
1,174
Location
Iowa, USA
I have a Reznor WMO furnace in the shop. The OEM "main" switch went bad. So I am in process of replacing it. The OEM was a double pole single throw switch. It switched both Hot and Neutral of the incoming 120V line.

I plan on replacing it with a SPST switch and not switching the neutrals. There is a mess in the small wiring enclosure of the Reznor and I think I can clean it up with less connections in the box.

Is a DPST switch appropriate in this as OEM? Or should the Neutrals not be switched? This is an older unit so things may have changed since it was manufactured.

The furnace calls for and is wired with a 30 amp circuit to the switch #8 then on the other side is #10 from the switch to controls. I'm also considering a 30 amp fused disconnect on the wall and running flex to the box with #10 to the switch.
 
To avoid these ads, REGISTER NOW!

TRWham

Well-known member
Joined
Aug 11, 2017
Messages
2,021
Location
East Cobb County, Georgia
There are a few applications where you do want to break the neutral to be sure there is no voltage of any kind that might lead to a spark during service. The one I am most familiar with is fuel pumps and dispensers (sparks and gasoline are a bad combination), but perhaps they treat waste oil burners the same way because of the presence of flammable liquid.
 
To avoid these ads, REGISTER NOW!
Top Bottom