I am having a problem with a friend of mine's A/C unit. It has a 17degree temp split but the compressor drops out now & then & wont come back on for a long time. My gauges show that the pressures are not equalizing after it kicks out, to allow the pressure switch to let the compressor restart. There is an expansion valve on the system. She tells me that the entire system was just replaced about 2yrs. ago. Any suggestions??? Its hot here in Houston & she is an elderly woman.
Sounds like something is wrong with the pressures in the system, the low pressure cut off should not be holding the compressor out it is in the safety circuit to shut down for low pressure only not to cycle the unit.
On some pump down systems it is used to start and stop units with a positive shutoff solenoid, mostly commercial and industrial systems with receiving tanks.