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Old 06-01-2010, 09:21 AM   #1
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Use of a TXV on a 4 ton unit


My buddy is looking at getting a 14SEER SSX140481A Goodman AC unit and a CAUF4860D6A uncased coil. In looking at the cooling data on this link:
https://www.acwholesalers.com/v/vspf...sx14_specs.pdf (pdf page 31)

It seems like the SEER performance of 14.5 to 15.50 goes with the air handler and not the TXV, but all the units they list with the TXV do worse then a good air handler with a orifice.

How do you decide if you need the TXV? Are most installers using them these days on 14SEER AC?

Thanks,

Jeff


Last edited by zootjeff; 06-01-2010 at 09:55 AM.
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Old 06-01-2010, 12:11 PM   #2
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Use of a TXV on a 4 ton unit


i always thought a txv would increase efficiency over an equivalent orifice coil. the idea is to control refrigerant flow dynamically, as opposed to constant flow, therefore allowing the system to run more efficiently and respond to system load.

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Old 06-01-2010, 02:37 PM   #3
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Use of a TXV on a 4 ton unit


Which air handler are you comparing to which furnace on that chart.
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Old 06-01-2010, 03:12 PM   #4
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Use of a TXV on a 4 ton unit


Quote:
Originally Posted by beenthere View Post
Which air handler are you comparing to which furnace on that chart.
CA*F4860*6A* G*V80905C** 45,500 33,200 15.00 12.50 1008561
CA*F4860*6A* G*V81155C** 46,000 33,600 14.50 11.80 1293957
CA*F4860*6A* G*V950905D** 45,500 33,200 15.00 12.50 921492
CA*F4860*6A* G*V951155D** 45,500 33,200 15.00 12.50 924446
CA*F4860*6A*+EEP 46,000 33,600 14.00 12.00 923927
CA*F4860*6A*+MBE2000**-1 46,000 33,600 15.50 13.00 923133
CA*F4860*6A*+TXV G*E80905C** 45,500 33,200 14.50 12.00 1273392
CA*F4860*6A*+TXV G*E81155C** 46,000 33,600 14.50 11.80 1293958

The TXV is only listed on the non variable speed blowers. It's like if they have a variable speed blower they don't use the TXV. Maybe that is how it shows up in the 15 SEER datasheet?

In any case, should I recommend a TXV for 70 bucks + install. Is it always worth it?
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Old 06-01-2010, 03:19 PM   #5
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Use of a TXV on a 4 ton unit


A VS blower usually increases SEER by .5 to 1 point.

Its not the use or lack of TXV your seeing, its the blower itself. And the case width of the furnace/blower.

A TXV never hurts.
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