Milk man - You can't charge a system with a receiver with sub coolong , it is what it is..
Charge to a full sight glass and and add 10% then pump down watch high side needle for rise over 5 psi if it does you are over charged if it does not run torch up and down receiver a couple of passes then take your finger and run it up receiver where the temp changes from cool to hot is your liquid level, Not To Exceed 80% volume,.... You are now charged...
Hope this Helps...