To get email notification when someone adds to a thread you're following, click on the star in the thread's header and it will turn yellow; click again to turn it off. To edit your profile, click on the gear.
The Wall has a powerful search engine that will go all the way back to 2002. Use "quotation marks" around multiple-word searches. RIGHT-CLICK on the results and choose Open Link In New Window so you'll be able to get back to your results. Happy searching!
In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.

What is SubCooling

TechmanTechman Posts: 2,101Member ✭✭✭
and what is it for? A house has 2- 3t AC systems, they are identical.The first floor evap is 15' away ,in the basement. The other evap is 40' away, up in the attic The cond units are labled 15* SC. Do I set up both units the same?


  • JStarJStar Posts: 2,668Member ✭✭✭

    Subcooling gurantees that you have enough liquid at the metering device. The amount of subcooling required depends on the pressure drop through the liquid line. See photo below...

    It's way too early for me to be doing any kind of real math, but you can calcuate the pressure drop of your LL, then correlate that to a temperature change in refrigerant. If the temperature remains below saturation, even after your pressure decreases, you are subcooled at the metering device. The manufacturer gives us an easy number to aim for, with a fairly healthy margin for error.
    - Joe Starosielec
    [email protected]
  • TechmanTechman Posts: 2,101Member ✭✭✭
    edited June 2013

    Hay JStar, where did you get this chart? My computer screen is fuzzy or something. Those two identical AC systems have two very different SC's. due to that "static head" of 1 psi press drop =2' vertical for R22.
This discussion has been closed.


It looks like you're new here. If you want to get involved, click one of these buttons!