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-   -   Do older A/C need TX valves? (http://www.diychatroom.com/f17/do-older-c-need-tx-valves-76089/)

myleena 07-13-2010 05:51 PM

Do older A/C need TX valves?
 
hope someone can help me.

I bought a used A/C and someone I know came to my place to install it for me (free of charge). The coil was missing, so I am in the process of purchasing one through an online supplier for $200 (the local suppliers are asking $600+ for similar coils).

The installer said I needed an extension valve while the supplier said older air conditioners donít need one. I donít know what to order?

My A/C is a 2-ton Bryant - Model 593C.

The supplier suggested the following:

Aspen uncased A Coil Ė CA24A2G - (no TX valve) - $200
Carrier uncased N coil Ė CNPVU2414 - (with TX valve) - $270

Any suggestion?

Thanks!!

NitroNate 07-13-2010 05:58 PM

a txv will increase the efficiency slightly but is not necessary. i recently replaced my old non-txv evap. coil with a txv one. the only problem i had is that with the txv installed, there was a slightly higher head pressure when the system started up that caused the compressor to require a hard-start kit to get going initially. i did not realize this at the time i installed it, however it only cost about $8 and 5 minutes to add the hard start kit.

in any case, if it's an older unit i would probably opt for the cheaper one without the txv. in my situation i was unable to find a matching coil without the txv in a reasonable amount of time.

myleena 07-13-2010 06:04 PM

Thanks for your answer... but what determines if the A/C is an "older" model?

And... how do I know in what year it was built?

I wish the installer would provide more information, but since he is doing me a favor, I don't want to harass him :(

yuri 07-13-2010 06:17 PM

I would get the coil w/o a TX valve. Uses an orifice. A TX valve can be hard on older compressors. See if you can find a generic ADP coil, they are good (I have one) Aspen is not my favorite. Originally that unit never used TX valves from the dozens I have seen. It will be a 13 SEER coil and that unit is probably 8 SEER so it may not work real well with that mismatch. The TX valve if adjustable by a good Pro can help but it can be difficult to start the unit with. Hard start kits will shorten the life of a compressor. Used equipment does not match well or last a long time. There will be a serial # on the model info sticker, post it and I will age it for you.

beenthere 07-13-2010 06:25 PM

Post the serial number of your outdoor unit. The date code is in it.

Doubt it "NEEDS" a TXV.

myleena 07-13-2010 06:34 PM

Here are the first lines on the unit specs:

SERIAL: 1105E36731
PROD: 593CJX030000AEAA
MODEL: 593CJ030-E

FACTORY CHARGED 4.75 LBS 2.16 KG
INDOOR TVX SUB COOLING 20 F

ect.

Let me know if I should type the other information on the label as well.

Marty S. 07-13-2010 06:40 PM

Believe that's an 05 2.5 ton. I'd get the TXV since it's listed right on the tag.

beenthere 07-13-2010 06:40 PM

Look if it has a size listing for the piston on that label.

yuri 07-13-2010 06:43 PM

10 SEER or higher 2005 model, 30,000 BTU = 2.5 ton. A 2.5 ton generic ADP coil with orifice, piston will work. Younger than I thought. Look at that label and see if the charge is R22 or R410. May have to order the specific coil for the type of refrigerant.

myleena 07-13-2010 06:51 PM

Here is a pic of the label:

http://img207.imagevenue.com/img.php...98_122_1lo.JPG


Whew... orifice, piston size, etc... I didn't know this would be that complicated..

P.S. The unit is younger that "I" thought as well... nice surprise :)

beenthere 07-13-2010 06:53 PM

A 65 piston will work.

Thats what it says on that label.

Marty S. 07-13-2010 06:58 PM

yep. Make sure to order a 2 1/2 ton coil. Two ton wont be big enough for that AC.

yuri 07-13-2010 07:08 PM

Because I am a nice guy I even found you this
http://www.catalog.bryant.com/gen/pr...PRD817,00.html
Actually we are all nice guys:thumbsup:

myleena 07-13-2010 07:11 PM

You all are nice guys... and I bet you are all GUYS :)

I will contact the supplier and send them the label; maybe they can suggest a better suited coil. The guy I bought it from said it was a 2 ton unit so that's what I told the supplier. Should I specifically ask for a "2.5 ton coil with orifice, piston?"

I just hope the 2.5 ton coil isn't too expensive.

If you GUYS have other suggestions, please let me know!

BTW, this is a fun forum :laughing:

yuri 07-13-2010 07:14 PM

ADP is "Advanced distributor products" and they make a very good generic coil. Most refrigeration and HVAC wholesalers should have access to them. 2.5 ton R22 coil with #65 piston/orifice is what they need to know. Order a 3/8" 2.5 ton liquid line sweat on filter drier also as he needs to install it to remove any contaminants from the system. Try these guys:
http://www.cozyparts.com/
ADP is owned by Lennox. Phone their 1-800 # and ask if they sell coils and driers as well as the Lennox parts. What is the make and model and serial # of your furnace. We need to know if it has a powerful enough fan to work with a 2.5 ton AC unit.


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