Increase cool fan speed on Carrier - http://www.hvacmechanic.com/ Forums
Original message
| Hasty
 |  "Increase cool fan speed on Carrier"
, posted Wed 16 Jul 18:00  
Hi, is there a way to increase the cool fan speed on a Carrier 58STX90-16 . My A/C contractor says that it only has 2 speeds and the cool speed is not giving me enough air flow to cool my home. Before the a/c was installed the unit could heat the home perfectly with good airflow.
Thanks!
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Replies:
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| allclimate
| "Re(1):Increase cool fan speed on Carrier" , posted Wed 16 Jul 19:17
Most furnaces that are not variable speed blowers (Which would be yours)have 4 speeds and only two are used one lower speed for heat and the highest speed for cooling. Heat does not require a lot of air flow to work (it absorbs easily thru the house)Air conditioning on the other hand needs to move a lot of air to effectively cool. Furnaces come shipped in the highest speed for cooling. Adding the A/C coil adds about a 1/4" or more static pressure that will slow the air down. most likely if the unit is sized OK the problem is air distribution. With a little info on your home I can pinpoint the problem (SQ FT, age, 1 story or 2 story and A/C size)
Russ (All Climate heating and air conditioning
www.allclimate.net
http://www.allclimate.net/
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| | Hasty
| "Re(2):Increase cool fan speed on Carrier" , posted Wed 16 Jul 19:30
Thanks for the reply. The home is 2600sq ft 2 story home and 2 years old. The AC unit is a 4 ton Ducane with a EMT248NBM1 coil. The house has 2 supplies 1 upstairs and 1 downstairs. Here are some pics of the mess I have in my attic now.
http://members.cox.net/atayde/P7150052.JPG
http://members.cox.net/atayde/P7150053.JPG
http://members.cox.net/atayde/P7150054.JPG
http://members.cox.net/atayde/P7150055.JPG
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