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mbates

07:51PM | 11/20/06
Member Since: 11/20/06
4 lifetime posts
Bvhvac
Winter is just turning the nights cold here in North Texas. Our central heater (located in the attic)is doing something a little different this year. When it comes on in the middle of the night, it’s about 35 degrees-F outside. And the thermostat is set calling for heat to come on at 60 degrees. But the heater fan runs for only 2 minutes, then turns off for 2 minutes, and then back on again. This lasts for about 2 hours every night when the heater first comes on. The constant cycling on and off can not be energy efficient….. and the noise keeps us awake at night.

Can you tell me why the unit is doing that? Is there an something that I can make to correct it?


claryraven

06:23PM | 11/30/06
Member Since: 11/29/06
2 lifetime posts
our heater has been doing the same thing and it has an electric ignition which is equally annoying. this summer we found out we had a gas leak under the house and it was repaired and we hoped it would improve, but no luck. our thermostat is an older model, could that be the cause?

claryraven

07:21PM | 11/30/06
Member Since: 11/29/06
2 lifetime posts
i found a website when searching mercury thermostats that explained the entire mechanism of action. i too am in north texas and it is cold and windy tonight. the thermostat reads approx 60 and it is set on 90 at this time. i manipulated the anticipator and it seems to help a little but according to the website it should be moved clockwise but the arrows on the face display a counterclockwise direction for longer cycles. also, when they discuss the position of the wiper, is it the long end or the arrow end that should be closest to the yellow wire?

mbates

10:09AM | 12/07/06
Member Since: 11/20/06
4 lifetime posts
Make and model # is: American Standard, Freedom 80, model #TXC048C4HPB1. I have heard that if the house is below 60 degrees, the unit will cycle every 3 minutes until the house warms above 60. And then the unit will run steadily until the thermostat setting is reached. Is that true?

mbates

10:19AM | 12/07/06
Member Since: 11/20/06
4 lifetime posts
The thermostat is less than 3 years old. It is a digital programable item that allows us to select a cooler temp (we chose 55 degrees) while we are away or asleep.

mbates

05:02PM | 01/15/07
Member Since: 11/20/06
4 lifetime posts
We finally found someone who knew what the problem was. It was the programable thermostat. The repairman suspected the thermostat was set for electric heat rather than gas heat. He had to research online and foundout how the change the coding from electric to gas...and it worked.
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