Coil with TXV

[nitrothunder]

when using a coil with a TXV and your soldering in the coil what should you do with the sensing bulb????? test question

[airworx]

burn it up.

[bornriding]

Remove it from the line or cover it with a wet cloth.

Richard

[resolutetech]

you just did nitro's homework riding

[beenthere]

cut it out of the way.

[wayner211]

Wrap it in a wet rag or put it down in a glass of ice water. In other words dont damage it in any way

[mark beiser]

I don't have any facts to back it up, but my gut fealing is that most of the "warranty" TXV failures that happen are due to installers not protecting the TXV sensing bulb when brazing the vapor line onto a coil or air handler that has a built in TXV.
Most of the coils and air handlers with built in TXVs have the sensing bulb mounted just a few inches away from where you braze the lines on.

[air2spare]

Originally posted by mark beiser
I don't have any facts to back it up,

with the evap coils are crap anyways (can you say Trane?)
but even then the sensing bulb is clipped on and very easily moved for brazing

[heetseeker]

What are the signs that a txv has gone bad?

[Milk man]

Originally posted by heetseeker
What are the signs that a txv has gone bad?

Overfeeding, starving, hunting.

Tip: Save the cut sheet from TXV boxes. They have troubleshooting info and how to adjust them.

[2hot2coolme]

If I sell a job with a TXV, I sell the TXV cased coil.

It's already installed.

[heetseeker]

Thanks for ypur reply but I do not know how hunting, overfeeding or starving manifest themselves. What would happen with these problems?

[Milk man]

Starving looks like the unit is short refrigerant, but your subcooling is mormal to high.

Overfeeding your superheat is very low and compressor may be sweeting.

Hunting is where your superheat never stabalizes.