hi all
Just recently joined a refrigeration company after many years of air conditioning installs.
Thing are going well and rely enjoying the change.
But having a few issues setting lp switch cut in and cut out .Can some one please explain in plain English how to do this? and what methodology they used
I want to use the pressure as the thermostat ..

chillier freezer
set point 2c -20
134a 404a

regards peter