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  1. #14
    Join Date
    Jun 2011
    Location
    NE Ohio
    Posts
    2,651
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    frost may or may not appear on the suction line, it depends on box temperature, system design, and charge ... do not use a frost line to charge a cap tube unit

    charge for ' around 10 degree superheat ' ( evaporator outlet ) when your box temperature starts to hit around 42 - 44 degrees, make sure you maintain ' around 10 degrees superheat ' ( evaporator outlet ) a few degrees lower that your off temperature setting ( do not allow system to flood, IE overcharged )

    cap tube systems are charged by targeting the lowest suction pressure / temperature while still maintaining superheat, also, pay attention to your ambient conditions

    or weigh in your charge
    Last edited by hvacskills; 12-18-2018 at 01:01 PM.
    "All that is necessary for the triumph of evil is that good men do nothing." (Edmund Burke)

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