furnace fan doesn't shut off. heat kicks on off. Is thermo bad?

   / furnace fan doesn't shut off. heat kicks on off. Is thermo bad? #11  
I tried that but it felt drafty. I have thought about adding a repeat cycling relay to get some circulation but maybe the circ Tstat that RNeumann mentions is the ticket.

Check your furnace install manual. My furnace has a few speeds. Circ spins the fan very slowly. Higher for heat and cooling.

If you have a multispeed fan you can wire it as described above. The thermostat will switch about any dry contact type switch so your relay would do the trick too.
 
   / furnace fan doesn't shut off. heat kicks on off. Is thermo bad?
  • Thread Starter
#12  
I run my fan all the time. The small fractional HP motor doesn't use enough power to show on the bill. Maintains a more even heat in the house and keeps the electronic air cleaner working on the air all the time.

Ron
Good point. I noticed the exact same thing; heat was more even. Extra electric for fan running could be mitigated some because , I believe, cycling
on and off uses a surge of electric for starting each cycle? Maybe, fan last longer too. But, they usually last long time.

My first heating was ceiling cable heat. When I built the electric company wanted us to use electric. We were offered big discount for being all electric home. Somewhere along the line, the electric company took back the discount. I say, "they snuck the raise on bill". I switched to heat pumps. Zoned heating areas in order to adjust temperatures during daytime and nite.

Later I got some gas wells. I have an allowance from gas well for home use. In air conditioners air handlers we placed heat exchangers heated with water from gas fired boiler.

My best heat, In my opinion, was ceiling cable. No air blowing around. Never need to paint. No one smokes here. Under tables didn't heat so good. It was expensive.
Each room or area had a thermostat. Only fully heated rooms that we used at that time. Nite or day adjusted. Our electric cable heat is still in place inclining. I is emergency heat in event our gas well is interrupted.

So that's the long story.. Fan on always is worth experimenting with. Cheers....Coffeeman
 
   / furnace fan doesn't shut off. heat kicks on off. Is thermo bad? #13  
I run my fan all the time. The small fractional HP motor doesn't use enough power to show on the bill. Maintains a more even heat in the house and keeps the electronic air cleaner working on the air all the time.

Ron

I do this in the winter only if I'm on generator back-up, to avoid the surge. Also in the summer while on AC with utility power, when air movement helps with cooling & humidity.
 
   / furnace fan doesn't shut off. heat kicks on off. Is thermo bad? #14  
Check your furnace install manual. My furnace has a few speeds. Circ spins the fan very slowly. Higher for heat and cooling.

If you have a multispeed fan you can wire it as described above. The thermostat will switch about any dry contact type switch so your relay would do the trick too.
Mine is from 1988 and is not set up with a circ speed. I did have a house that had that and you are right, they do not blow enough to feel the draft. I suppose I could add a frequency drive if the motor is rated to take one. And wire it such that when the heat pump is running to go to full speed, but when I just want to circulate run it lower. At some point here I should probably upgrade the heat pump and make sure it has that feature. We do use the heat pump on the shoulder months. Also when I am away from the house since the wife is not into feeding the wood stove.
 
   / furnace fan doesn't shut off. heat kicks on off. Is thermo bad? #15  
Mine is from 1988 and is not set up with a circ speed. I did have a house that had that and you are right, they do not blow enough to feel the draft. I suppose I could add a frequency drive if the motor is rated to take one. And wire it such that when the heat pump is running to go to full speed, but when I just want to circulate run it lower. At some point here I should probably upgrade the heat pump and make sure it has that feature. We do use the heat pump on the shoulder months. Also when I am away from the house since the wife is not into feeding the wood stove.

Unless you have a multispeed fan motor (something with 4-5 wires coming out of it) changing speed isn’t all that easy. They do make VFDs for split phase motors but they aren’t all that cheap. It’s the brushless motor.......grrrrr
 

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