Hey guys im new to the hvac field and have some questions about low ambient charging, here is the situation in which i was in today.
I got a call out to refrigeration walk in cooler it turns out that it was tripped on high perssure from the other day and had a plug condensor, once the condensor cleaned i threw my guages back on and took some sc and sh readings. Here is what i got , 2-3 degree subcool if any, 20 superheat, head pressure was 30 above ambient, a full sight glass and i had a 10 degree split over the evap coil, suction line sweating back nice, 60 degree ambient temp. So where my question is steming from is full sight glass, 30+ ambient head, and 10 degree split over the evap that all looks good. but as far as 2-3 degree subcool and 20 superheat it looks like i could use some gas. So if im without a sight glass to prove the liquid line is full how am i determine wether or not have a good charge?