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  1. #1

    r22 at 300 psig?

    Why does my employer keep all his ptac 10 ton 2 stage units running at 300 psig with fan cycle.. 50 on the lowside... These numbers don't seem right but this is how they want to run em.

  2. #2
    Join Date
    Oct 2001
    Posts
    6,966
    what is the application of the unit retail,computer rooms???....why is that suction so low at 300psi head? dirty condensers and short on that charge is my idea there at 300psi that amperage on the compressor should be at least 75% of the RLA running.
    "when in doubt...jump it out" http://www.youtube.com/watch?v=U1qEZHhJubY

  3. #3
    Quote Originally Posted by maxster View Post
    what is the application of the unit retail,computer rooms???....why is that suction so low at 300psi head? dirty condensers and short on that charge is my idea there at 300psi that amperage on the compressor should be at least 75% of the RLA running.
    I work at a mushroom farm.are goal is to keep the rooms at about 50 degrees Fahrenheit. Condenser coil are clean and I weighed in the refrigerant according to nameplate. 2 stage 10 ton compressors. Weatherking unit.

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