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major problems with new carrier system
our company installed the last part of march a new two ton carrier base model air conditioner with matched indoor cased evaporator coil. the unit ran fine for a couple of months with no issues. at about the middle of june the unit would not cool. someone went out and replaced the txv because the unit would rung with good pressures, but after about 30 minutes of run time the unit would pump down, almost like there was a restriction, and there was no pressure drop across the liquid line drier. after a couple of days with the new txv the unit again would not cool, another tech went out there and found that the compressor was running with equalized pressures. the compressor was condemned, and replaced.after a couple of days, same symptoms the system was running fine for a bout thirty minutes with good pressures (135- 315 16 sh 20 sc) and had a 20 degree drop across the evaporator coil. this is a 410 a system. after a while of running the pressures dropped to a suction pressure of 80 and the subcooling went up to 40 degrees. it was almost like the txv had failed again, or there was a major restriction in the indoor coil. there is no temperature drop in the liquid or suction lines, and the lines are brand new and have been blown through with nitrogen several times. today someone was going out there to replace the evaporator coil entirely, and when he went to pump the unit down, the compressor pressures were equalized, the compressor was not pumping. the suction line was warm, and the discharge line was outdoor air temperature, not even warm to the touch. this would be the second compressor that has failed in this system. this is a very basic residential setup with only about 20' line set (3/4 and 3/8) with only about four foot of vertical change. the condenser is below the evaporator. we are at our ropes end with this system and it makes no sense what this system is doing. any ideas of what to do next would be much appreciated. short of asking our carrier salesperson for a new coil and condenser, we have hit a road block with everything that has been tried thus far. the unit info is as follows:
condenser carrier model 24abb324w330
evaporator carrier model cnpvp2417ala
compressor copeland model zp20kae-pfv-830
thanks to all