I have called the contractor back once and the same thing is happening again. The 3 ton upstairs unit will cool for about 10 minutes (during a very hot day) and then shut off and the thermostat says wait. then it will kick back on about 5 minutes later and run for a little while, usually 10-20 minutes and kick off again. The air coming out is not nearly as cool as the downstairs 4 ton that works flawlessly. They are both the tranquility 27 packaged units.
The first trip out, the tech said he coulnd't really isolate a problem but had the water lines bled (we heard some gurfling in the garage where they come in) and changed the air filter and it seemed to work ok after that. He said it was probably the high pressure limit switch due to not enough water getting way up there to the 2nd floor attic where the unit is located. Now it is doing it again. I don't hear the gurgling but could be because I haven't listened for it. It's 100+ out and I don't spend too much time sitting out there waiting for it..
I guess he will fix it one way or another, I am just curious if anybody has a guess as to what it could be. It's kind of discouraging knowing that you spend $30k plus on a new system and if it's kicking limit switches off and cycling so much it's probably using more electric than a regular heat pump.. not to mention it was almost 80 degrees upstairs all weekend.