Results 1 to 9 of 9

Thread: super heat

  1. #1

    super heat

    How do you determine the super heat on a unit per say 404 ice maker or a simple cooler 134a or R22 thanks for the help

  2. #2
    Join Date
    Oct 2011
    Location
    Chicagoland Area
    Posts
    4,578
    Are you asking how you know what it's supposed to be or how to check it?
    Officially, Down for the count

    YOU HAVE TO GET OFF YOUR ASS TO GET ON YOUR FEET

    I know enough to know, I don't know enough
    Liberalism-Ideas so good they mandate them

  3. #3
    Join Date
    Nov 2011
    Location
    St. Louis
    Posts
    3,334
    I assume checking it would be no different than any other refrigeration system, as would subcooling, regardless of refrigerant. But what kind of ballpark readings would we expect, what kind of ambient or box temps do we need to consider and other conditions...hot pull down, evaporator coil frozen over etc.?

    Is it pretty much like simple conditioning? Like I would expect my superheat to be high if the inside coil is absorbing heat from warmer unfrozen product in a walk in freezer? Lower SH if the evap. coil is obstructed with ice? Higher if the seal around the door is shot?

  4. #4
    Join Date
    Jul 2012
    Location
    Western KY
    Posts
    1,221
    Who cares. Just double the nameplate charge and its all good.

  5. #5
    Join Date
    Jul 2012
    Location
    Western KY
    Posts
    1,221
    Quote Originally Posted by Tommy knocker View Post
    Who cares. Just double the nameplate charge and its all good.
    That's a joke. Don't do that. Check the same as u would on any system. On refrigeration there is typically a receiver and subcooling won't help with charging.

  6. #6
    Join Date
    Jul 2005
    Location
    Phoenix, AZ
    Posts
    266
    Go to where the superheat is. At the TXV bulb. Or the evaporator outlet to take your temperature reading. Get your suction pressure as close to the evaporator outlet as possible. Pull out your P-T chart and convert that suction pressure to temperature using the chart, and subtract the difference. That will be your superheat.

    Sent from my DROID RAZR using Tapatalk 2

  7. #7
    Join Date
    Dec 2003
    Location
    Salisbury, MD.
    Posts
    1,473
    If you have no information on the unit, I would generally go with 10-15 SH and 10-20SC. Now if you try and use these numbers during adverse conditions you may find you are adjusting the charge later. I also like to check these when i am closer to normal operating conditions. I wouldn't be too concerned about subcooling on a walk in freezer until my temps were well below 32degrees and closer to normal for ac. Now, this is if I have no other information. Some units run much lower superheats when operating normally. But if you are trying to get a system running and have no clue what the manufacturer wants I go with the 10-15 and 10-20. It will get you fairly close to a proper operating system.

  8. #8
    Join Date
    Sep 2007
    Location
    Denver , Co.
    Posts
    109
    my signature says it all lol.
    Outlaw guns? only outlaws will have guns
    Those who live by the sword are SHOT by us who don't.

  9. #9
    thank you all for your help

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event