Results 1 to 10 of 10
  1. #1
    Join Date
    Oct 2002
    Location
    Houston,Texas
    Posts
    167

    Hmm

    working on a True T-23F freezer,what would be the ideal defrost time for this particular freezer,looked at it and this freezer goes into defrost every six hours and it stays on defrost for 20 minutes,is 20 minutes to much?any input would be much appriciated Thanks.

  2. #2
    Join Date
    Oct 2002
    Location
    Houston,Texas
    Posts
    167

    Hmm

    Norm,can you help!

  3. #3
    If it has a defrost termination sw then the time isn't critical, set it for 30 min. If not and it works at 20, leave it alone.
    Hey cockroach, don't bug me!

    www.AskTheDiceman.com

    www.TheColdConspiracy.com

    www.Pennwood-HVAC.Com

    Bring Em Home....

  4. #4
    Join Date
    Jul 2000
    Location
    Guayaquil EC
    Posts
    10,080
    The T23F is 120V I believe, so you want to look at a Paragon 8141-00 timeclock. It has a set of NC for the compressor, NO for the defrost heaters and a defrost termination solenoid to kick it out of defrost with the closure of the terminator klixon at the coil.

    It's a bit pricey, but I'm pretty sure that's the one you need.

  5. #5
    Join Date
    Apr 2003
    Posts
    139
    20 is good unless there isnt a defrost term ( a line connected to X on the timer) I wouldnt go any lower than
    10 though.

  6. #6
    Join Date
    Dec 2001
    Location
    Ocean Pines, MD
    Posts
    6,935

    35, Max.

    And make sure it has X and defrost termination stat. You really shouldn't have to rely on time for termination. But make sure you have the stats, (and separate limits are good too-but this IS a True unit). Frequency depends on use. You can try to time around peak times, but unless your there to recheck, it's going to vary

  7. #7
    There are a lot of variables here.

    Is the heaters in proper position to actually heat all of the evaporator coil?
    Is the drain line properly sized, properly heated and properly sloped for run off during defrost cycles?
    Are the fans working correctly?
    Are the door gaskets sealing and seating properly?
    Is the environment the system is in, not too hot and not too cold? How about humidity? Is it excessive, like as in Central Texas???
    How many door openings are taking place? The more that door is fanned, the more hot air enters the box and it's moisture is frozen into the coil.

    High useage box, more defrost cycles.
    Low useage box, less cycles.

    And then there is the issue of what is your product? If it's ice cream .... your talking about a deep freeze and only one or two defrosts a day.

    I hate to even mention this, cause I know SOME PEOPLE are gonna jump all over me about the fact that I am speaking highly of a product which most refrigeration men & women ... dont care for.
    For example, if you were dealing with a truly commercial duty box, like say an old Hussman UML-3BS, for example. You would have the capacity to hold your product at minus fifteen below zero, or colder. And you would have the ability to do two defrosts a day at 25 minutes per cycyle and never hurt the product.

    But that is all contingent upon your having a REAL piece of commercial equipment to work on in the first place.



    Oh ... and what Icemeister said about that time clock. .. right on the money. It is the best clock for the job. And just make sure your X terminal is hooked up properly and all the features work! Otherwise ... your gona have an unsatisfied customer who relies upon your expertice to protect their products.


  8. #8
    Join Date
    Dec 2001
    Location
    Ocean Pines, MD
    Posts
    6,935

    Bob

    Your sure giving Many D's a run for his money.
    If I'm not mistaken it's a True single door upright cap tube model that is not to be used for ice cream.
    We can only hope that all our customers live up to your expectations in equipment selection. Right.
    You are correct on the envioromental conditions in the settings of the clocks, but most of that can e a wait and see.
    I have a Traulson 2-door model that is in basically a tent with an exhaust hood, 2-steps from the beach, 100% humidity and the help using it for air conditioning, (I sat at the outside bar and seen this). How many defrost times should it have?

  9. #9
    Join Date
    Oct 2002
    Location
    Houston,Texas
    Posts
    167

    Thumbs up

    Thanks,for the input,I would monitor the operation to see how the freezer does next week,main complaint is that the freezer would take to long to cool to the desire temperature,I have checked it out and can't find any problems with it,I did add one more pin to the defrost timer to see if that would help.at this time it has four defrost pins and it set @ 10 minutes.
    Thanks:Hugo

  10. #10
    Originally posted by hugo
    Thanks,for the input,I would monitor the operation to see how the freezer does next week,main complaint is that the freezer would take to long to cool to the desire temperature,I have checked it out and can't find any problems with it,I did add one more pin to the defrost timer to see if that would help.at this time it has four defrost pins and it set @ 10 minutes.
    Thanks:Hugo
    I dont know how easy it is to see inside the evap to know whether or not you need that many defrosts.

    What would be ideal is to sit atop the unit and peer thru a glass window at the evap coil. With that you could see how much ice or frost is building up on the coil .. and when it is doing so.
    You could also see how much defrost time is necessary for minimum clean up.

    Afterall, you only want to initiate a defrost when it is absolutley necessary ... and not a moment before than.

    So if you could determine you need a defrost every eight hours ...during normal business ops ... then that is what you oughta schedule.
    But if you dont need any at all during the night ... then there should NOT be any ... during the night.
    Think of them as "Silver Bullets". Use only as necessary!



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