The ATA is a tin plated copper coil. Carrier refers to the plating as "Armour Coat". It is supposed to be Carrier's most reliable coil. Both coils have a 10 year parts warranty. The tin plated coil has been recommended on this forum. My contractor installed ATA coils for my Carrier systems.

Had the above carrier system installed yesterday ...OMG the installer was a best just at of high school...3new returns installed , original wall returns disconnected ..1return makes buzzing sound-1 original air vent makes some noise.. But I am concerned about the infinity thermostat set up.. They didn't even set date or time- I research how to bring up set up mode looks like the heater name is there.. But on ac it said 1 stage-then it looked like it was going to run a check so I was afraid to mess it up so I exited the system...I am not confident they were competent to set it up seems all to smooth.. But heater NOT SET Up has a new vent pipe needed to be installed and it raining... Will come back to install- do they start up the heater as well to verify all is right ???what questions do I need to ask... This has not gone smoothly at all- contractor explains everything is digital and told them exactly what the problems were..however not any adjustment needed..good install(he states) PLEASE HELP!!!!

There is no excuse as to why the Infinity controller has not been set up properly. The date and time needs to be set up otherwise you will never be able to set up the four daily temperature periods. The contractor has the ability to run diagnostic tests. He can enter their name and address so it pops up when there a service problem.

The controller should automatically recognize the furnace and condenser. Have them show you how to operate controller. This is a very good thermostat once it is set up properly.

I agree... But what questions should I ask to see on the thermostat myself to be assured it is running in the correct mode i.e I believe I saw 1 stage Ac selected as the setup for system . i was sold a two stage system and also does it not suppose to show u the static pressure reading???
Thanks so much for the help...

You can check these items yourself. You can enter the service menu by holding down the advanced button for 10 seconds. You will see a list of menus. You will find the information you want. Be careful not to change anything.

If you do a Google search you should be able to find the Infinity controller installation manual. It describes the various set up options.

Thanks mike home, but should my thermostat be set up on 2 stage for my ac ?

If you have the Performance 24ABC7 condenser, then yes the Infinity controller should be set up as 2-stage AC. You should see the AC model number listed in the set up menu. If not, then the controller may not be communicating to the condenser.

You have listed several issues in your threads. Has the contractor returned to correct the problems?