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  1. #1
    Join Date
    Jul 2012
    Location
    Southwest
    Posts
    114

    EPR on a Heat Pump?


    What do you guys think of this? I worked on a unit close by with its own issues. This is on a medium sized commercial building. I didnt even want to look at it, until they ask me to...
    EPR, 5 ton 13 seer 208/1 Heat Pump. Coil most likely a 5ton fixed orifice. Messed up line sizes, 5/8 liquid, 1 1/8 suction.. Again gulp, 125' + of lineset, yes I know a txv is required..
    Without even looking, or being asked to look at it, I feel it probably has a clogged screen at the orifice, poor piping design, and mix matched coil/condenser seer ratings, plus requires a txv, when a orifice is being used.

    I'm basing these conclusions on the unit I worked on nearby. I expect the pictured unit to fail soon, which will get thrown onto one of our guys.

  2. #2
    Join Date
    Apr 2012
    Location
    Paper Street Soap Company
    Posts
    2,304
    Unless they used the EPR to solve a oversizing issue is all I can think of,

    I would love to check that out and find out what their rationale was for installing that.

  3. #3
    Join Date
    Jul 2012
    Location
    Southwest
    Posts
    114
    It ran all 8 hours I was there, without stopping! lol

  4. #4
    Join Date
    Dec 2007
    Location
    South Eastern Missouri
    Posts
    446
    Please excuse my ignorance but what is an EPR?
    A people who would exchange liberty for apparent safety, will deserve neither and lose both.

  5. #5
    Join Date
    Apr 2012
    Location
    Paper Street Soap Company
    Posts
    2,304
    Evaporator Pressure Regulator.

    Typically they're are used on refrigeration equipment where you would have multiple evaporators and multiple liquid lines with dedicated solenoid valves to cycle each section off and on.

    They're supposed to keep an evaporator from going below a predetermined pressure and apparently it was some hacks attempt at solving a chronic icing problem.

    worked well didnt it

  6. #6
    Join Date
    Dec 2007
    Location
    South Eastern Missouri
    Posts
    446
    Quote Originally Posted by Six View Post
    Evaporator Pressure Regulator.

    Typically they're are used on refrigeration equipment where you would have multiple evaporators and multiple liquid lines with dedicated solenoid valves to cycle each section off and on.

    They're supposed to keep an evaporator from going below a predetermined pressure and apparently it was some hacks attempt at solving a chronic icing problem.

    worked well didnt it
    LOL Ok, I get it now, thanks for the info.
    A people who would exchange liberty for apparent safety, will deserve neither and lose both.

  7. #7
    Join Date
    Jul 2002
    Location
    Centerville, Iowa
    Posts
    383
    Clogged screen at the orifice? That would cause higher than normal superheat, that looks like frost after the EPR, if it is then that means that there is liquid refrigerant reaching the EPR indicating low superheat.
    In my neck of the woods to most people "Maintenance" equals cursing at and/or kicking something when it breaks down.

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