Hvac R us 2: Thanks for the support. I was hoping that some people would understand where I was coming from. Yes, they changed the liquid line filter/dryer when they opened up the system. I just want you to know that it was the fan coil that they changed the TXV in. The serial # is 2001A62237, model # is FV4ALK003
Originally posted by hvac r us 2
Thorton you have the right approach, as a homeowner myself I understand where you are coming from.
TXV’s can go bad, a lot more TXV’s have failed due to foreign material, overheating, or just plan old miss-diagnosed in my opinion.
Non-condensable can shut a TXV down right now; of course changing the TXV will correct the problem after the system has been cleaned up properly. But it probably would not have failed in the first place if a proper evacuation and start was performed during installation.
Puron can be “topped off” so to speak. It is a 50/50 blend with an even leak rate. But the bigger question is why should it have to be topped off? Don’t let anybody kid you when they say, “better to be a little low” that is just as damaging to the compressor.
When you’re low on refrigerant there is not enough suction gas to properly cool down the compressor.
A little high, a little low…here’s a novel idea, how about being right on?
Sorry, you caught me monologing…sore subject with me (refrigerant charging)
Anyhow, checking sub cooling would be to complicated to explain to somebody with no refrigeration knowledge. But it would not hurt to ask you’re dealer how they determined if the charge is right, guys that respond with “the pressures looked good” are scary.
In your case the answer would be they charged by sub cooling, probably for that unit in the range of 12-14 degree’s of sub cooling.
Another thing to look for, did they change the liquid line drier? If the answer is no I would worry about their workmanship…insist on a new drier since they have been into the system.
Good luck, there are lots of great HVAC guys out there. Protect yourself by educating yourself on the subject.
One thing I did not see mention was the serial number? There were some units that got out with contaminated accumulators. I believe without looking most was in the 04 range.
There is a policy for that which gives the dealer the ability to change out the unit and labor.
Something you might want to look into.