Differential in the electric switch

[@frankroper3274]

Differential is simply the difference between the set point and where the tstat calls for the unit to cut on and off. Most times it is 2 F such as if you have the tstat set at 70 F it will cut on at 72 and off at 68 for cooling and on at 68 and off at 72 for heat.

[@throttlebottle5906]

@ 4:02 likely the thermostat they wish they kept installed :))

[@grayfurnaceman]

They were not without problems, but they generally outlast the electronics. GFM

[@MsFishingdog]

thanks for the video. great info.

[@grayfurnaceman]

Welcome GFM

[@Spector_NS5_RD]

Great tutorials. Quick question, do you have any wiring tutorials for those old Honeywell fan limits? Those are before my time as a tech. I'll be honest, I don't get to do many repairs / service calls on older systems. It's either changeouts from existing or from scratch (new construction). Investors, flippers, huge rental companies and the like. Just last week we put in i put in 7 AC's (coil condenser) and 5 furnaces (coil condenser furnace). That's an ordinary week - year round. Get in get out. I'll most likely never see those systems again once i close the door behind me. Is it worth my time learning older tech? Thanks.

[@grayfurnaceman]

I have several. Try this one first. kzbin.info/www/bejne/oJiTn35qhrGjkNE GFM

[@ScramblerUSA]

I would rather use the word "Hysteresis" instead of "Differential" here. I don't know if that's the term used in the industry, though.

[@grayfurnaceman]

Hysteresis is a scientific term. I generally try to use descriptive terms where I can. As I have been a teacher, its important to simplify whenever possible. GFM