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  1. #1
    Join Date
    Dec 2015
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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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