Air Conditioning - Larger Piston

I have an 11 month old unit for my upstairs & it wasn't keeping up. A/C company came out . . . their diagnosis: the piston was too small (said they replaced it). Does this sound legit? Thanks ahead of time.

Stace

their diagnosis: the piston was too small (said they replaced it). Does this sound legit?

Aw come on thats a new one on me. What are they talking about.?????
Id say call another AC company now.
the big or small of an AC would be in tons or BTU's. could he mean the orifice at the coil inside?????That is used when you dont use a TXV valve
ED:rolleyes:

I did a search on this site for the word "piston" and did come up with a few subjects that alluded to similar circumstances, so I don't think the a/c company's diagnosis was absurd. I originally thought they meant the piston in the compressor, but I see some references to piston size 70, removing the flange, the a-coil, etc. I'm now thinking that it's more like a schrader valve or something that is used for regulating freon flow. What is the piston's function and how it might apply in my case. Thanks again - Stace.

I'm now thinking that it's more like a schrader valve or something that is used for regulating freon flow. What is the piston's function and how it might apply in my case. .
It can be the orifice that meters the freon to the A coil in side the home. For what you called for on the AC he should have seen what the temp drop is over the coil there first.

ED;)

I normally call it an orifice but some around here do call it a pistion. Usually the evap comes with the correct sized "piston" orifice. Why they would have had the wrong one in there I have no clue.

They didn't charge you did they ?

Call them up and ask them to decipher the redneck jargon piston for you. Say do you mean your going to over haul my compressor. In that case I would like aluminum piston's a stroker crank and fluid dampening fly wheel, and titanium valves.
I have heard some crazy off the wall names that make no sense for an expansion but never heard piston.

I would like aluminum piston's a stroker crank and fluid dampening fly wheel, and titanium valves.


Don't forget the nitrous. :D

It may just be a regional thing like pop or soda. Here in Cincy I hear the fixed orifice called a piston all the time.

flowrater piston.;)

If the piston at the evaporator is not sized properly, the system will not cool properly. This happens sometimes when a new condensing unit is piped into an older evaporator.

Thanks to all who responded. I think I'm going to forego the nitros in favor of the flux capacitor conversion kit. Seems like there might be some truth to what they said, but still seems a little fishy since this is only an 11 month old house. I'll dig a little deeper and keep ya posted -- and no, lucky for them, they didn't charge me. Thanks again!