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Frozen Line set

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  • #16
    Re: Frozen Line set

    If you can't resolve the cause...then resolve the problem. I agree this sounds like an air flow issue. If the fan speed is set correctly and you can find no other options, then the Johnson Controls A-419 is an answer. You can place the thermister on the evap supply lines and wrap it well. Then set the control to interrupt the condensor at say 34 degrees with a differential of 10 degrees. This will solve any freezing issues and keep the unit cooling during any call. I have needed to use this setup for odd situations and it works. You can make this control heat or cool any way you want the system to operate, with any delta T you set.

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    • #17
      Re: Frozen Line set

      sounds like a TXV problem give us some the suction and head pressures and outside air and inside air temps, suction line temp at service valve and the wet bulb temp at the return...

      Try taking the TXV bulb lose and get a glass of hot water and a glass of cold water(see where I'm going with this?) try submerging the bulb in one at a time and go observe the head and suction pressure. if there is no change then the power head of the TXV is dead (gas leaked out) if it gets better with the hot water it is leaked down some and you might be able to squeeze it down with some plyers for temporary until you get the new head (or TXV)... pump down unit get new power head (if it can be changed) and replace it. If it is a "sporlan" you should find a # stamped on it like "45" or "55" or "65" go get one of the same #. the model# on it may be "OEM" so look for the stamped one. also check if the system has a liquid line filter dryer and see if it is cooler on the discharge side or sweating , this would indicate that its clogged. good luck and let us know what happened.
      Last edited by jaminjimlp; 10-31-2011, 02:53 AM.
      ROMANS 10:9 confess with your mouth that JESUS is LORD and believe in your heart that GOD raised him from the dead and you will be Saved.

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      • #18
        Re: Frozen Line set

        1 sq ft per ton is rather large. With that calculation a 3 ton unit would require 36sq ft. That would mean a return air size of 18" x 24". More realistically, 75 to 80 sq inches per ton is fine. So a 3 ton unit would require a min of 225 sq inches eg, 10" X 24". You mentioned subcooling but u didn't say what your superheat is...you need both before you start looking for probs.

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