Electrical Assistance with a furnace please
Hi all, I just installed a new Suburban NT20 furnace and I need some help with the wiring. There's only four wires, red (hot) yellow(grnd) and two blue which are for the t-stat. My issue is that the ...
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The red lead of the voltmeter would go to one wire and the black to the other. Meter set on DC volt scale around 20 volts or so. The meter will read voltage. If there is a negative bar on the left side of the reading, it is reversed.
On a analog meter, one with a needle, the meter will deflect to the left if reversed.
On a analog meter, one with a needle, the meter will deflect to the left if reversed.
