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Originally Posted by Bugeater
That's interesting that you say that, I had my condenser changed out a couple years ago and I don't believe they changed the evap, and it doesn't have a TXV. I know the pistons are model-specific as well, and I have no idea if they put the proper one in either. That's another reason I went to school for this, it drove me nuts not knowing how the heck any of this stuff worked, and you have no idea who you can trust in the business.
I haven't taken any classes on commercial systems yet, and I have PTACs at one of my properties and all I've learned from them is that they are a complete pain in the ass.
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Don't trust anyone else in this business! There are to many people that think they know what they are doing simply because they have been doing it for 20 years.
If you know the series of operations and the flow of refrigerant you should be alright. Things just get bigger. Meaning 2 speed equipment, bigger tonage attained by multiple compressors and so on. Be sure to learn your 3 phase power stuff for the commercial work.
Now you will find some equipment that uses amonia as its refrigerant in larger buildings. Be very careful with those units. Amonia is a lot more explosive than other refrigerants.
PTACS do suck but they are basicly glorified heat pump window units. Cheaply made and not meant to be repaired much.