heating vent damper install question

[Fitter30]

The damper question is resolved, but the underlying sizing issue is worth flagging for anyone landing on this thread later.

A 60,000 BTU furnace in a 1,008 sq ft well-sealed house is roughly 2x oversized. Even dialed down to 45,600 BTU via the jumper it's still heavy. Short cycling reduces efficiency and puts more wear on the heat exchanger than longer steadier runs would.

If the house is truly well air-sealed as described, a proper Manual J would likely put the heating load somewhere in the 20,000–30,000 BTU/hr range for Michigan at design temp. Worth running the numbers just to understand what you're working with. There's a free iOS app called HVAC Load Calculator that makes it straightforward if you want a ballpark.

Have you adjusted the cycle rate in a electronic thermostat or the heat anticipator on a mechanical. Is the blower shutting off when t stat satisfy then comes back on in 5 minutes or less?

 

[corvairbob]

the furnace inducer starts in about 30 seconds the flames lights and in about 30 seconds the blower comes on it runs flame for maybe 8 minutes and then the flame turns off and then a few minutes later the blower turns off. i went thru the honeywell electronic t-stat and set it for gas heat and then all the rest of the settings seemed to just go into default. the house is comfortible i have it set for 67 deg and it runs like i said maybe 10 minutes give or take a bit. it runs a bit more often when the temps get down into the low 20's or below. the furnace guy when he set the furnace it was getting cold out and he stayed and watched it run thru a cycle. in doing a what size furnace for a 1000 sq ft house be i got 40 to 60k for a size.