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  1. Superheat and subcooling.

    Quote Originally Posted by nike123 View Post
    Superheat of TXV should be adjusted at commissioning or replacement of valve.
    Superheat should be adjusted at about 65% of evaporator design TD when ambient temperature of cooling equipment is 1-2 K near design temperature.

    http://maleki-hvac.ir/Portals/0/Kuba...ructions_2.pdf

    Subcooling should be adjusted with refrigerant charge when ambient temperature is near design temperature. Condenser could be partially covered to get that design condensation temperature.
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  2. Presure-Entalpy chart explained

  3. 9 superheat & subcooling scenarios

    Quote Originally Posted by nike123 View Post
    • LOW CHARGE = High superheat. Low suction pressure, indoor TD, subcooling, head pressure & compressor current draw.
    • OVER CHARGE = Low superheat. Normal indoor TD. High suction pressure, subcooling, head pressure & compressor current draw.
    • LOW INDOOR AIR FLOW = Low superheat & suction pressure. Low to normal head pressure. High indoor TD. High to normal subcooling. Not much effect on current draw.
    • MILD LOW OUTDOOR AIR FLOW = Low superheat & subcooling. High suction
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  4. Extending torque wrench correctly

  5. What is the purpose of having the capillary tube soldered to the suction line.

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