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  1. #1
    Join Date
    Dec 2015
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    3
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    Adding refrigerant (404A) to Duke SUB-CP-TC 60 M

    I have Duke SUB-CP-TC 60 M sandwich unit for Subway restaurant. See attached pics. It's not cooling, staying around 56deg, everything is pretty clean. I am not trying to recharge this myself, this is just for my information as I am trying to learn. Which port is used to charge the refrigerant? One port is on left, just before the dryer and other is on the right (see pics). It's not very clear to me which is the low side.

    Thanks for any help.
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  2. #2
    Join Date
    Jun 2018
    Location
    Pensacola, FL
    Posts
    17
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    The port in front of the dryer is obviously liquid, or "high" side.
    The one on the compressor is called "Process port". It is a low side port.

  3. #3
    Join Date
    Jan 2016
    Location
    The triangle in the Keystone
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    883
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    I.C.E. this is a 3 week old thread without a response for a reason. DIY... and for a Subway none the less.

  4. Likes ECtofix, HVAC_Marc liked this post
  5. #4
    Join Date
    Mar 2013
    Location
    Billington Heights, NY
    Posts
    20,923
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    Quote Originally Posted by ranger007 View Post
    I have Duke SUB-CP-TC 60 M sandwich unit for Subway restaurant. See attached pics. It's not cooling, staying around 56deg, everything is pretty clean. I am not trying to recharge this myself, this is just for my information as I am trying to learn. Which port is used to charge the refrigerant? One port is on left, just before the dryer and other is on the right (see pics). It's not very clear to me which is the low side.

    Thanks for any help.
    If it's not DIY, you dont need to know which is the low side port. Your tech will know. Quit trying to BS us...

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