I was asked to look at a customers walk in beer coolers. There are two identical units side by side. One has a hot shot label on it. The other is unmarked. I told the owner that I could not be sure what refrigerant is in the unmarked unit and asked if he had any idea.
He called the company that has worked on the coolers recently and they said that they did not know what refrigerant was being used but could tell if they gave it a shot of gas.
Now I know a PT chart can help you to decide what refrigerant is in a system and there are some rather pricey refrigerant analyzers but the description of giving it a shot of gas to detect the type of refrigerant is new to me.
Is this slang for some technique that I am unfamiliar with?
I do residential HVAC but recently have started working on small refrigeration units at the request of my residential customers. Any idea on what a shot of gas means?