I often pump down a system and have a helper recover the refrigerant at the shop. It saves time on the job and is cheaper for me to pay a helper than do it myself. There will be two brass valves sticking out of the unit where the lineset would attach. Take off the big brass cap with an adjustable wrench and see if the inside is threaded all the way down, if it is there is still refrigerant in the system if not its dry.
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