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View Full Version : Do I need to change the evaporator coil?


kathuat
10-22-2006, 10:01 AM
I have a 20 year old furnace and looking to replace that with a new 80/90% 2-stage furnace. My A/C unit is only 6 years old (10 SEER, RHEEM). At this point, I have decided not to change the AC considering the costs of a brand new system. However, the evaporator coil was not changed when the AC was changed 6 years ago. I understand that the coil needs to match with the AC. Since the coil is so old, does it make sense to use the same coil over a brand new furnace or I am better off changing the coil as well. If the recommendation it to change the coil, how do you find a match with the old AC or do you have to use a generic coil with the unit (with a TXV valve)? Do you use a RHEEM coil or you can use any coil?

Your help and assistance will be highly appreciated.
docholiday
10-22-2006, 10:05 AM
to tell you the truth, you can still get a coil that matches that unit for now. however, in the future, if your exsisting coil were to fail, leak, or something else, then you would have to replace the entire system (less the furnace).

If it were me, I would have them install a current matching coil to that outdoor unit. I'd hate to have a 20 year old coil drip water all over my new furnace.
beenthere
10-22-2006, 10:05 AM
I'd change the coil.

You should be able to find a Rheem match.
If not, an Aspen, or ADP coil.
kathuat
10-22-2006, 10:11 AM
My existing AC is a 4 Ton, 10 SEER Rheem? Does the new RHEEM matching coil need to have a TXV valve? How do you go about finding a match to the old AC? Just want to make sure what I am being recommended is correct. Thanks much.
BaldLoonie
10-22-2006, 10:20 AM
Rheem's matching coil for that was the RCBA-048. TXV not necessary but being a scroll unit, will work. The RCGA-048 or RCHA-048 have TXVs which will give you a little more humidity removal. ADP's HA12248 is an ARI match too and a good coil. Not sure what Aspen but many will be fine. Even the new RCFA coils will work since the scroll will work with the expansion valve. The RCFA is a restrictive coil where the older coils allowed for much better airflow.