This video is about commercial refrigeration. Video #1 is about liquid refrigerant flood back on a supermarket rack. (Closed Captioned)

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7 thoughts on “Refrigeration 101: Liquid Flood Back

  1. Gavin Humes says:

    frost is just an indication of pipe temp relative to dewpoint and humidity it truly doesnt say anything about refrigeration except for the fact the pipe is colder than 32. the reason i say it depends on the suction group is because depending what youre running for suction pressure saturation with the correct superheat you still may form frost. example. you are working on a system with a -30 suction group 404a you have 12 degrees superheat at coil and 40 deg superheat at compressor. copeland spec is 20 deg superheat at compressor to ensure no liquid. so with a -30 saturated suction group and a 40 degree superheat you will still have a suction temp of 10 degrees and will form ice you have no liquid present. now say you have a plus 15 suction group, you have 20 deg superheat at compressor pipe temp of 35 you will not form ice now say you are flooding back and have a 5 degree superheat and a pipe temp of 20 now you are flooding back. so depending on suction group ice does not ALWAYS indicate flood back.

  2. Paul Dr. Freeze says:

    Fools frost as an example of superheat problem stupid Low temp suction groups all have frost Whats the superheat at the compressor? All circuits have LLS on racks already Cap was not insulated  Stupid vid must be a HVAC guy

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