Air Conditioning - Add a new return?
Doityourself.com community forum was created to provide answers to all questions related to home improvement and home repair. Doityourself community can help you find information about how-to topics on small fixes to large remodeling projects. With comprehensive how-to content and expertly moderated community forums DoItYourself.com makes it easy to tackle even the most complex home improvement projects.View Full Version : Add a new return?
kamrandiaz
07-21-07, 08:46 PM
Ok here's the scoop:
I got a 5 ton 10 SEER CAC with only ONE 29"x24" return on the 2nd floor. It's positioned right above the stairwell to the second floor so I guess it captures a bit of the first floor air too. This unit cools approximately 2500 square feet totalling 2 floors. It takes about 5-6 hours for it to cool down about 5-6 degrees (from 80 to 74).
Do you guys think one 29x24 return is adequate enough or can my cooling be improved? My 2nd floor gets cooler quicker than the first floor with a 2.5-3 degree difference on the first floor (76 on the first floor, 73 on the 2nd floor). I see a potential for another return in the 1st floor hallway but I have to relocate a chimney flue for it. How large should the return ducting be?
I could add a 12"x8" (inches) duct easily but that seems to be too small for a return right?. I could double that if I relocate the boiler and hot water tank flue somewhere else.
As I understand, for a return: 12x12 is per ton so if I want a 5 ton air handler to fully cfm I would need a total of 60x60 return? or more than one 29"x24" return. What do you guyz think?
BTW in my previous post I was wondering if someone could tell me if I certainly do have a 5 ton evaporator coil by its model number, here it is again:
http://img527.imageshack.us/my.php?image=modelbi0.jpg
Carrier evaporator coil model #:
2PGH005000
I gota know for sure if this is indeed a 5 ton coil so I can add more returns. Should I just do a manual measurement LxWxH of the coil and post it here?
Any advice would be appreciated...
>Kam
I got a 5 ton 10 SEER CAC with only ONE 29"x24" return on the 2nd floor. It's positioned right above the stairwell to the second floor so I guess it captures a bit of the first floor air too. This unit cools approximately 2500 square feet totalling 2 floors. It takes about 5-6 hours for it to cool down about 5-6 degrees (from 80 to 74).
Do you guys think one 29x24 return is adequate enough or can my cooling be improved? My 2nd floor gets cooler quicker than the first floor with a 2.5-3 degree difference on the first floor (76 on the first floor, 73 on the 2nd floor). I see a potential for another return in the 1st floor hallway but I have to relocate a chimney flue for it. How large should the return ducting be?
I could add a 12"x8" (inches) duct easily but that seems to be too small for a return right?. I could double that if I relocate the boiler and hot water tank flue somewhere else.
As I understand, for a return: 12x12 is per ton so if I want a 5 ton air handler to fully cfm I would need a total of 60x60 return? or more than one 29"x24" return. What do you guyz think?
BTW in my previous post I was wondering if someone could tell me if I certainly do have a 5 ton evaporator coil by its model number, here it is again:
http://img527.imageshack.us/my.php?image=modelbi0.jpg
Carrier evaporator coil model #:
2PGH005000
I gota know for sure if this is indeed a 5 ton coil so I can add more returns. Should I just do a manual measurement LxWxH of the coil and post it here?
Any advice would be appreciated...
>Kam