ALWAYS use a TXV... one of my minimum requirements... Like ALL coils get a float safety switch... no exceptions.
The only TXV issues I had were the Rheem/Ruud coils in 2010... only had 2 bad ones... both of them replaced under warranty and I got labor to change them.
TXV's, like anything else, have specific details which must be followed for them to work properly and last a long time. I prefer to REMOVE the bulb when brazing... then replace it a half hour later when the suction line is cool. On Rheem coils the bulb is loose from the factory... so it will be mounted after brazing. The TXV issues I have repaired were mainly due to improperly mounted bulbs.
I do not mean this to be rude... however I really cannot understand why it is sooo hard to understand how to mount a tXV bulb... The ides is for the liquid refrigerant to STAY in the bulb... so mount it so the line is UP... how hard is that?
TXV's are a great thing... methinks the only reason they are not universal on residential AC is cost.
BTW: How many pistons do you see in refrigeration... <grin>
Galatians 2:20-21; Colossians 1: 21-22 & 26-27; 3:1-4; Romans Ch's 5-6-7-8
2 Chronicles 7:14
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