I only really work on environmental chambers. Occasionally I will work on large environmental chambers which are basically just walk in freezers. Larger systems are unfamiliar to me. A lot of people will just say keep adding gas until the sight glass clears. This is OK most of the time . But if I was on a callout to a walk in freezer. There's no information about the system other than the gas type. Target Superheat and sub cooling are unknown. Charge weight is unknown. The system is unique so no comparison can be made. If I had smart probes, how would I go about evaluating the system in a more professional way than just clearing the sight glass?
If I saw a subcooling of ??? If I saw a superheat of ??? On an unfamiliar system how would I know what these figures should be?
Charging environmental chambers consists of charging the low stage to a predetermined standing charge. And weighing in the high stage. Other chambers need a bit of experience to charge as sometimes conventions aren't followed. Sometimes you can't clear the sight glass on the high stage. Because when there isn't much load on it, there could be too much frostback. Cheers.
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