commercial refrigeration

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29 thoughts on “adjusting and replaceing TXV

  1. OcRefrigeration , Hvac & Electrical Video's. says:

    Good video. But, as u probably figured out after you made the video you were going the Wrong way with the Txv to open it. counter clockwise opens a txv. you kind of have to think of it like opening a Faucet. to Let more Refrigerant into the Evap you open the Faucet. we open faucets counter clockwise which lets in More refrigerant into the evap dropping the head pressure and suction will pop up because of the increased amount of refrigerant entering the Evap. But, what you have to Think of Even Before all That is Why ? did the Txv all of a sudden close. you were right in your diagnosis that the Power head probably failed. but, you had closed the valve alot so it would have to be Re-opened and adjusted to a 10 degree t/d or 10 degree superheat at the evap. i Personally Never Just Replace a Power head because the Txv is old and worn out anyway with a possible sticking pin or Worn out spring inside. For a Better Job and Happier customer and no call backs it's allways Best to Replace the Txv as a Whole item. 35 years in the Trade. Also if there is a screen in the old txv you need to look at it . if it's full of junk you might have a drier coming apart. and need to replace the drier too. i'm glad u replaced the txv at the end. that was best. we all have off days. but you got it done. thats what counts.

  2. Ivansgarage says:

    WOW a guy that knows how to read PT chart. I did refrigeration 40 years ago on 20 tonTurbo Ice Makers 12 plates 12 distributors on a txv and NEVER used a temp probe to do superheat.

    Simple open txv till it just starts to flood suction, close it to bring frost line back to evaporator, DONE deal you are using all of the evap, and not flooding suction line.

    And a txv with external equalizer tube that is attached to the suction line at the bulb
    does just what I explained (it will kind of by pass the temp bulb) till the evap gets established.

    Nice Job

  3. 9to5tech says:

    What's that black stuff on the txv bulb. Just wanted to know. And also do u have to have it on their. And if you don't will that case damage to the txv

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