warm air from vents, not hot - http://www.hvacmechanic.com/ Forums
Original message
| wdsfr68
 |  "warm air from vents, not hot"
, posted Tue 29 Apr 08:47  
Just moved into a house that's about 6 years old. The house has an American Standard Freedom 80 gas furnace. The furnace has a new filter and the burners are coming on. I hear the burners light and then after a minute or two the blower comes on. However, I've checked the output from the vents and it's only about 88-90 degrees. From what I understand the vent output into the rooms should be well in the 120-130 degree range. The furnace will then stay on for about 5 minutes in the 90 degree range and then shut off.
Any ideas ?
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Replies:
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| theduke03
| "Re(1):warm air from vents, not hot" , posted Tue 29 Apr 17:32
I suspect that gas pressure is too low. If you don't have a manometer then you will need a pro to adjust the pressures correctly.
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| | wdsfr68
| "Re(2):warm air from vents, not hot" , posted Mon 5 May 10:16
I checked the temperature on the main floor vents and it's coming out between 115-120 degrees. However, the second floor is only reaching about 90 degrees. I seem to be getting a strong air floor on the second floor just not the temperature.
Will an inline fan help or do you suggest something else ?
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| | theduke03
| "Re(3):warm air from vents, not hot" , posted Mon 5 May 19:03
That's really impossible to have good air flow to 2nd fl and a 30 degree temp difference at the same time. You need to insert probe into vent to measure temp cuz it mixes w/ room temp air as soon as it leaves vent. You don't need to though cuz supply air is 115-120 like you said. Sounds great to me. You sure that wasn't a ceiling return temp you were reading? If room(s) on 2nd floor are cold in winter then check for dampers in trunk for each floor and close 1st floor 1/2 way.
"My dad was the most feared furnace fighter in Northern Indiana."
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| | wdsfr68
| "Re(4):warm air from vents, not hot" , posted Fri 9 May 16:46
I have a thermometer with about a 6 inch probe that goes down well into the heat vent. I've checked that the dampers are open. Is it possible I'm just losing that much heat in the ductwork ? As I said, I'm still getting very good airflow on the second story.
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| Jojo98
| "Re(1):warm air from vents, not hot" , posted Tue 29 Apr 13:32
Sounds like you have an air flow issue. Make sure the filter and blower wheel are clean. Also, ensure you do not have more than 1 filter in the return duct. Pull the filter and turn the heat on and see what happens.
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