Low ambient conditions can cause head aches with air conditioning and refrigeration systems. Using condenser flood back to maintain discharge pressure is a great way overcome this problem. Using a combination of an ORI valve and ORD valve can accomplish this task. It will maintain discharge pressure by flooding the condenser while maintaining flow through the system.

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23 thoughts on “Maintain Discharge Pressure With Condenser Flood Back In Low Ambient Conditions

  1. Jeff Lawrence says:

    Fantastic Video Today. Love it.

    This a really great style with the diagrams and explanations.
    I often watch your channel but really like this format.

    Looking forward to more and hopefully persuading you more towards refrigeration, racks and controls, etc.

    Excellent work.

  2. Sterling Archer says:

    That's super interesting stuff I forgot from trade school, thank you for the reminder . The chillers i work on only use fan speed control , but I would imagine that up in Canada maybe because its gets so cold you fan speed is not enough to build up hp ?

  3. Joseph Schneider says:

    I do that differently. I install a low ambient pressure switch to stop condenser fan motor on cool days. Once pressure build up, pressure switch closes allowing the fan to come on. I adjust the pressures I want from the switch depending on the type of refrigerant and sub-cooling recommended by unit data plate. My goal its to maintain 100 percent liquid in the liquid line.

  4. Ebrahim Tirgardoun says:

    would ORD or ORI make it difficult to get the correct subcool measurement when charging the system, do we measure subcool same way at the outlet of condenser or inlet of receiver, or would be tricky with ORI,ORD SYSTEM,DO they fail to open or close .Thanks

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