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mr_bill92@yahoo.com

new member

0 post(s)
posted on 6/19/2007

I have a three year old trane central AC (3 ton I think), in a 3 year old 2 story 1,800 sq. ft. house. During the hot part of the day, the airflow from the vents is diminished. The house warms to about 80 degrees, and the air continues to run.

During the night, it cools down to where we have the thermostat set, usually around 72.  If we adjust the thermostat throughout the day to stay a degree or two below the house temperature, the house doesn't get as warm, but still warmer than we would like.  Here is my question.  Is there a system on the AC that will diminish the air output flow as an efficiency thing?  Can I 'open' the ducts so that the air will flow like it does at night, so the house will stay cool?  I have cleaned the unit outside, and inside and replaced all the filters.  I can also find no ice or even condensation, so it doesn't seem to be freezing up.  Any help would be appreciated.  Thanks,

Bill

 


 
 
Replies [ post reply ]
tammyngabe1@att.net

senior member

45 post(s)
replied on 6/19/2007

i would try a t.d. across the coil.put a temp probe on the return side of your system and then put on your supply side and you should have a temp. diff. of around 20 deg. let me know if this helps.


ljsteffes@comcast.net

senior member

26 post(s)
replied on 6/23/2007

Was the system sized properly for the structure? That unfortuately is the problem in todays world. If the A/C is oversized it will cool down the temp too fast to acheive proper dehumidification. If undersized, it wont keep up with the heat load. Duct work in not always sized properly. This will affect the system operation as proper air flow is critical to proper operartion and comfort. Unfortunately our industry is crying for qualifide techs, installers and designers. Too many turd hurders in the business today. Get a truley qualified tech to evalute your system, and recommend proper soulutions such as zoning, 2 stage, dual system, etc. Good luck.

Gasman



cplangelo@yahoo.com

junior member

7 post(s)
replied on 7/19/2007

I HAVE TO AGREE WITH GASMAN. IT SOUNDS LIKE A DUCT ISSUE.
MANY CONTRACTORS USE FLEX DUCT INSTEAD OF HARD PIPE WHICH
IS O.K. TO USE BUT, A GIVEN SIZE SUCH AS 12' FLEX DOES NOT
CARRY AS MUCH AIR AS 12' HARD PIPE. ALSO PROPER DUCT DESIGN 
IS A BIG ISSUE. GET A CERTIFIED SERVICE TECH TO EVALUATE 
YOUR AIR FLOW PROBLEM. ANY QUESTIONS OR CONCERNS E-MAIL ME BACK



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