T valve - http://www.hvacmechanic.com/ Forums

Original message

beginner

162.84.152.237

"T valve" , posted Thu 22 Apr 21:29

I have a job involving replacing a water regulating valve in an AC. The capillary tube from the original valve is brazed to a T. It looks really bad. Now the new one has a flare nut on it. I wanted to use the flare nut instead of brazing. It will save me time from recovery, vacuuming, and charging. The local shop has a T valve. I am thinking of using one on the high side service valve then connect the flare nut from the regulating valve. Had anyone ever use one? Are they strong enough for the high side?

Replies:

Xenos
Webmaster

67.71.21.201

"Re(1):T valve" , posted Thu 22 Apr 21:48

Yes I use them all the time, for installing pressure controls and such.

Xenos.

The best way to escape a problem is to solve it.

beginner

162.84.152.237

"Re(2):T valve" , posted Thu 22 Apr 22:16

Thanks! Going to try one next Monday. I haven't work on an AC unit before. It is an old 5 ton unit. It has 2 compressors. I am pretty sure it will need charging as well. There is no sight glass. It does have a Penn pressure control. All the lables are gone. Any thought of the lowside should be on the manifold?

Xenos
Webmaster

67.71.21.201

"Re(3):T valve" , posted Fri 23 Apr 07:50

It's all dependant on load, It’s superheat that really matters. The back pressure could be anywhere from 60-75, the big thing is, it must be over 58. When you set up the new valve set the head pressure 230lbs.

If it’s R- 22 that is .

Xenos.

The best way to escape a problem is to solve it.

beginner

24.215.232.3

"Re(4):T valve" , posted Fri 23 Apr 18:07

Thanks!

hvacguy1179

24.49.188.136

"Re(5):T valve" , posted Sun 25 Apr 13:04

Make sure when you charge go with tempture dont go with presures ie. Super heat over suction subcooling over high side we are in the busness of temp control not presure control a older time said to me once when i first started and he found out i didnt have temp sensors buti had gages.

God made heat but I control it.
Who has more power Man or the one who cant even control his own creation

Xenos
Webmaster

67.71.21.201

"Re(6):T valve" , posted Sun 25 Apr 13:27

“we are in the business of temp control not pressure control”

What a great line, I’m stealing it.

Xenos.

The best way to escape a problem is to solve it.

beginner

24.215.232.3

"Re(7):T valve" , posted Tue 27 Apr 22:47

OK! Put in the valves today. I hooked up the manifold and the low-side was reading 40 psi high-side was 150. The ambient temperature was about 60 deg.F. The water temp. is about 55. All the labels from the unit were gone, except the name plate is Weather Wise and Barkow. I am guessing it uses R22. So, going back there tomorrow with the R22 and give it a little charge. This is unit has beening servicing the owner for about 25 years. The daughter took over and forgot to shut off the water during off season. She learned from the mistake.

Xenos
Webmaster

67.71.22.52

"Re(8):T valve" , posted Wed 28 Apr 08:08

If it is R-22 with a high side pressure of 150 the water regulating valve wouldn’t even be open yet therefore no cooling would be taking place. If it’s open tighten the spring down to the line on the valve, it’s about 1/4 -1/3 from the top.

Xenos.

The best way to escape a problem is to solve it.

beginner

24.215.232.3

"Re(9):T valve" , posted Fri 7 May 13:32

Finalized the job today, got it all set up. Just in time to turn the unit on for the place. Thanks!