Question about charging semi hermetic fridge

[flectric]

This is my first post and i'm glad to be apart of this hvac forum, as a fresh out of school worker I still run into things I either have to retained or never caught on to. But i'm trying hard to learn everything. I'm a electrician by trade but thought in this economy two trades is better than 1 to keep me working.

Question. What should suction pressure be on a 38deg cooler running r22 in a chilled water system. ?

I have charged up semi hermetic before, and I always charged up based on sight glass and head pressure. Yesterday, I was charging a system and it dawned on me I dont know what the suction pressure should be. I know the reciever is there and will deter too much refrigerant from entering evap, but is there a way to tell what the suction should be?

[ryan1088]

Welcome to the trade and the site. Seems like you need to get your post count up and apply for pro membership, that way you can get some really good answers to your needs.

[2sac]

The PT chart is your friend