A customer has 2 Ruud mod. URGE-270-100CKR units which are useless at present. One unit has 1 circuit restricted, both
circuits are restricted on the other. I installed a LL filtr
dryr, and backflushed the distributor and cap tubes w/ nitrogen. I then evaced it, and weighed in 5lbs R-22.
I then observed 160/10 psi (dischg/suc). I added another lb.
and pressures remained 160/10. the other units act the same way... coils are clean and airflow ok. My boss can't see how 3 of 4
circuits are stopped up. Units are 10+ years old. We can't scrap the units,is the only fix ....to replace or rod out the captubes? Also, anyone knoe the correct charge,per circuit?