Oil plugging condenser coil

[Danimal535]

So last year customer called me no A/C spring 2010 so I go to her house and unit has High head low suction. Restriction so I remove refrigerant and blast the coil with nitro filled with oil closed system ad 1 /2 oz oil evacuate and charge all good no problems all summer get a call today no A/C same zone. Unit is 5yrs old never prob before last year Condenser is in attic 15 ft away from air handler in attic forget brand name job belt drive condenser fan ducted up false chimney. System was designed by engineer if its the same problem should I try a solinoid on the liquid line or a trap?

[jpsmith1cm]

High head and low suction aren't symptoms of a restriction, they are symptoms o a restriction that was missed and a bunch of extra gas was dumped into.

Measuring superheat and subcooling will help to eliminate that from happening.

[Danimal535]

could be JP It was almost pumping down
Why did this oil migrate

[JakRabbit]

By some odd chance is the Indoor Coil very dirty or did you ever clean it? This causes a low Suction of course not so much the head pressure though. If the compressor is above the Air Handler yes you need a Valve on it.

[Danimal535]

coils are both clean ah is 15 ft from condenser 12inch lift once i blew out coil all was good

[Danimal535]

wow now that I think about it It was the evap that was plugged with oil sorry its been a year

[JakRabbit]

Put a Solenoid Valve on it if the compressor is higher in elevation. This is because the oil will migrate to the Evap coil.

[Danimal535]

compressor is same height

[Danimal535]

Well it was not the same problem as last year it was a bad thermostat sending a signal thru w making heat turn on