Hey, interesting read.

I have bought myself the fieldpiece ssx34 which automatically works out subcool and superheat also the diagnostic psychrometer, which tells you what your super heat and sub cool should be.

I have a client i look after that has loads of apac commerical air conditioning units. I have got all the coils, drains filters clean

I now want to performance test and check with the new meters

I really have never been shown properly, and the college text books are useless.

i appreciate all the information and i cant wait to become a better fridge mech.