Removed a 3 ton lennox r22 split system on saturday and replaced it with a luxaire 3 ton r410a system. There was no place to run a new line set so we flushed it with par flush and nitrogen and did a bunch of leak checks. We installed the A/H with a TXV and installed the new condenser, pulled a 300micron vac that held, opened the valves and added 3.5lbs of refrigerant. The unit was running PERFECTLY: 20 degree split, 11 degrees of subcooling, no problems what so ever.
So i decide to cycle the white rodgers thermostat we installed as well. Turn the temp down, let the unit shut off and then turn it back on.....The CFM comes on but not the compressor. Ok so i clamp up my amp meter, turn the disconnect back on and check it out: The compressor starts pulling LRA. At this point im pissed, so I shut the stat off again and wait a few minutes. The condenser comes on and is working perfectly!!!! I shut it off again and turn it back on.....compressor out on LRA again. I did this a few times and got the same results everytime.
What could be causing this problem? I was thinking that maybe the pressures inside the compressor are not having time to equalize which could be causing the compressor to pull LRA....Tell me what you think.