working on a rtaa 140 ton
1991 model, twin screw.
the question that i have is about the common, 198, 199, diag.,
now i know about the hi discharge temp can cause low oil flow diag, due to the velocity,
also i know about dirty coils, filter, fan, and fans running backwards, and also non condensiables,
i did a pd across the oil filter and is only about 2-10 lb pd across oil filter, cleaned the coils on maint, all fan working and not running backwards.
i told customer these r the issues that can cause this and what i have checked,
i suggested the oil filter, liquid line filter be changed due to know knowing when last time this has been done., i was going to calibrate the oil pressure switch, and he told me just to replace the switch, oil and refrig filters,
now it there anything else that can be done, im thinking not,
has anyone had problems with the mechanical oil switch going bad,?
any other suggestions?