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  1. #1
    Join Date
    Aug 2012
    Location
    Portland, Or
    Posts
    134

    Refrigeration piping and suction line trap help???

    Gentleman,

    I made the mistake of researching when I install a trap on suction line, and every manufacturer/HVAC site seems to have a different answer, so now I'm more confused. I'm gonna install a HP which is above the air handler, coil in basement. Piping is gonna go up 15' come over a few feet back down then over a few feet then into HP. Do I have to install a trap at the suction riser???? It's 410a, 35' line set at most.

    Goodman says anything over 20' install trap ( says 2 different things)
    Carrier Puron piping guideline says no trap period
    HVAC new says anything over 20'
    Goodman long line set practices says install if elevation diff exceeds 80'
    General info site says anything over 15'
    Lennox says 5-50' install a trap
    Some sites are saying if the height difference is more than 15'




    What's the general rule, as far as a trap? Difference with refrigerants? is it just for a vertical run? Difference with a HP? Just wanna know the general rule and my situation above guys? I figure I ask techs here versus what I read on a piece of paper or website.

    Thanks guys

  2. #2
    Join Date
    Apr 2013
    Posts
    6
    Quick warning: I am still new to this trade, but I'm going to tell you what I've been told is correct. (According to textbooks)

    Two reasons for using Traps on the suction line is to (1) provide extra turbulence for the oil and refrigerant to mix better so it can successfully return to the compressor and (2) help prevent refrigerant flow back to the TXV bulb to throw off it's superheat readings. I would see what the Manufacturer says about that specific unit though, to be sure.

    Again: If I'm wrong someone correct me, this is what I've read in textbooks and I know they can be ... off sometimes.

  3. #3
    Join Date
    Aug 2002
    Location
    Southold.calm
    Posts
    5,616
    Reread the text books

  4. #4
    Join Date
    Mar 2013
    Location
    Joplin,Missouri
    Posts
    310
    With the application you have and just a 35 foot total length I don't believe oil return will be a problem. If it were going in my house I would not install a trap.

  5. #5
    Join Date
    Apr 2013
    Location
    Home Counties UK
    Posts
    1
    Please be aware it will trap oil very nicely as well as refrigerant
    also decrease suction gas velocity

  6. #6
    Join Date
    Aug 2012
    Location
    Portland, Or
    Posts
    134
    Brian when would I install a oil trap and what length?

    Oldgit what will trap oil very nicely?

  7. #7
    Join Date
    Aug 2012
    Location
    Portland, Or
    Posts
    134
    Can installing a oil trap cause issues?

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