I had a cooling coil replaced a few weeks ago. My old coil was an older style (slab) 3 ton coilI. I upgraded to a carrier 3-1/2 ton cube coil and left the old condensing unit in place. My condensing unit compressor (17yrs. old also) starting shutting off at night. The tech was having to run refrig. pressures a little higher than normal to get the return line to sweat. After a week of cutting on and off we decided to replace the old CU with a new Linux 3-1/2 ton model. Things seem fine at first (2nd day on 6-25-09) but that unit started shutting off as well. It ran for most of the night and cooled the house from 83 deg to 76 deg. First thing this morning the compressor would not kick in. After a rest of 30-45 min it begin running but It will run for 30-45 min or so and the compressor will kick out (fan stays running). The air supply fan is starting to show it's age and will be replacing the fan soon; thinking there's maybe not enough air flow. When the unit is running I'll get 54deg air at the air device and the condensate with flow normal. I do have a medium grade digital programmable thermostat installed (Lowes or Home Depot type). One last thing the circuit board in the unit has been replaced 3 times due to capacitor's and fans going out in the condensing over the years (again 17 yrs old). Please help...this replacement thing is getting expensive.
You need to find another hvac contractor from all the things you stated it's not the equipment it's the people doing the installtion/service. For starters theses days you never use a 3.5 ton coil on a 3.5 ton air conditioner it won't ever achieve the efficiency labeled on the energy label. Also it sounds like before you replaced the outside unit they might have had a r-410a metering device for your older R-22 unit then when they switched to the new 410a they probbably did not flush the system out mixing oils from r-22 over to 410a is not a good thing. I'd try to get your money back find a qualified company don't go for the cheapest nor the big ad companies find a small family ran buisness that has referrals Facebook is a great place to find contractors the yellow pages and craigslist avoid these days. If the unit is new cleaning it will not solve anything this is clearly a bad installtion.
First of all, clean your outside coils so that you are assured of good cooling air. The compressors have an overtemp device that is usually internal to protect them against heat. If you have an air compressor use it to blow out the coils good. If the compressor will start, the capacitor is good so it sounds like a cooling problem with the compressor
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