coleman furnaces

[riadoc]

Are the fan switches on a coleman furnace adjustable. This furnace sits in a trailer. The blower motor runs for about 3mins after thermostat is satisfied. Is this the correct amount of time or is it too long?

[roaddog]

Your fan will run until your heat exchanger has cooled down enough to "break" fan switch. Is your thermostat overshooting its set point because of this?

[Milk man]

Is your filter clean. What about your A-Coil?

When was your last tune-up?

[RoBoTeq]

Sounds a little long. Are you certain it is 3 minutes, or might it just seem that long :D

Are the homeowner of this unit or a tech working on it?

[riadoc]

I am a service tech. Adjusted anticipator on thermostat and watched cycle off. It is a 7600 series coleman furnace and the fan shuts off at 2min 30 seconds. Is there some sort of timer on this furnace that breaks contact after so long.

[frigetater]

look at the unit...a tech should be able to tell what cycles the blower off.....

[beenthere]

It could have a fan limit switch with the fan switch fixed at 105-20, or a fan switch at 110-20, or 130-35.

You'll have to look for yourself which one is controling the fan.