fan shuts down

[salv97]

i have a 23 yr old bryant heater,when it cycles on and off the fan shuts down too,shouldnt the fan run constantly till it reaches the desired temp,how can i fix this problem,i thought it was suppose to work that way

[hvacrmedic]

i have a 23 yr old bryant heater,when it cycles on and off the fan shuts down too,shouldnt the fan run constantly till it reaches the desired temp,how can i fix this problem,i thought it was suppose to work that way

The fan is supposed to shut down at the end of the cycle. If the heater isn't heating the house, then call an hvac contractor and have them check it out, or set the t-stat higher.

[salv97]

the fan shuts down every time it cycles every 3 or 4 minutes the fan should continue till it reaches the temp setting,right

[hvacrmedic]

the fan shuts down every time it cycles every 3 or 4 minutes the fan should continue till it reaches the temp setting,right

Ok, I think I understand what you're saying now. The fan is short-cycling during a call for heat. Same answer though, you need to have it checked out by a qualified service tech. I could go over a couple of likely causes for that, but unless you're going to attemp a repair youself, that info won't be of much value to you, and unfortunately we can't provide DIY advice in this forum.

[salv97]

can you tell me a couple of things that it could be,thanks

[hvacrmedic]

can you tell me a couple of things that it could be,thanks

I can only list two possible causes without providing DIY info. Those are plugged air filter and/or too many vents closed off. Have you checked the air filter? Do you have several vents closed off? The other items on the list would involve mechanical repair to the system, and because of that they would fall under the category of DIY, which again, is not allowed in this forum. HTH.

[salv97]

ok thanks,its not either of those two

[ccut]

the fan shuts down every time it cycles every 3 or 4 minutes the fan should continue till it reaches the temp setting,right

If you cancel your call for heat will your fan run in the on position?

[man from trane]

What kind of stat are you using? If it's mechanical it could be the anticipator adjustment.

Has it always done this? New house? You said "heater". Is that electric or gas furnace, or heat pump?

[Rusty49]

sounds like it's cycling on temp limit. Get a pro to find out why or if.

[uniservice]

ANTICIPATOR

[salv97]

its a gas furnace,ive had 2 thermostats and its done them on both,the fan will run on on position,

[Rusty49]

are you saying the funace shuts down after running a few min. and not reaching your thermostat setpoint, and then cycles back on a few min. later?

[beenthere]

Time to call a contractor, instead of guessing over the internet.

[trout lake]

ive alwayz wonder about anticipators that maybe the issue now that i think about it anticipator purpose is to trick the thermastat to come on when the temp is a little higher than the space hmm let me post this i want more info on anticipator trouble shooting i just know the anticipator is set to the current draw of the gas valve.

You need to breath when you write. The post would be easier to follow (if possible)

[man from trane]

ive alwayz wonder about anticipators that maybe the issue now that i think about it anticipator purpose is to trick the thermastat to come on when the temp is a little higher than the space hmm let me post this i want more info on anticipator trouble shooting i just know the anticipator is set to the current draw of the gas valve.

I-Phones are great but they do make puctuation difficult, don't they?

The anticipator is simply a small heater in series with the R-W circuit that heats the bimetal during a call for heating. Mechanically, the snap switch or mercury bulb has a 2 degree swing. The anticipator is designed to heat the bimetal about 1 degree, so the room temp only has to rise 1 degree to end the call for heat.

On old standing pilot systems, yes, you set the anticpator to the gas valve current draw. On modern systems, you set it to the heating control circuit current draw which is usually printed somewhere on the wiring diagram.

The first thing I do when I work on a system with an anticipator is sell them a new digital stat, programmable or non depending on the application.

[trout lake]

I-Phones are great but they do make puctuation difficult, don't they?

The anticipator is simply a small heater in series with the R-W circuit that heats the bimetal during a call for heating. Mechanically, the snap switch or mercury bulb has a 2 degree swing. The anticipator is designed to heat the bimetal about 1 degree, so the room temp only has to rise 1 degree to end the call for heat.

On old standing pilot systems, yes, you set the anticpator to the gas valve current draw. On modern systems, you set it to the heating control circuit current draw which is usually printed somewhere on the wiring diagram.

The first thing I do when I work on a system with an anticipator is sell them a new digital stat, programmable or non depending on the application.

Trane man
Well explained!

[salv97]

i have a 1400 square foot home rancher single home all one floor,the heater is 114000 btu single stage, i have newer windows and 20 inches of insulation in the attic,he said this is toomuch heater too much for this house so thats why its cycling on and off so much

[man from trane]

i have a 1400 square foot home rancher single home all one floor,the heater is 114000 btu single stage, i have newer windows and 20 inches of insulation in the attic,he said this is toomuch heater too much for this house so thats why its cycling on and off so much

OMG, you could run a duct to your neighbor's house and it heat it too! That's more than double what you need for your house. Must have been a sale on that model at the distributor when they put it in. That's a bummer. My first house had grossly oversized equipment and I hated it, but it was brand new so I couldn't justify replacing it.

[sammy37]

i have a 1400 square foot home rancher single home all one floor,the heater is 114000 btu single stage, i have newer windows and 20 inches of insulation in the attic,he said this is toomuch heater too much for this house so thats why its cycling on and off so much

Maybe time to consider replacing that thing with something more efficient and of a smaller btu input.
You will be much more comfortable with a unit that is properly sized.