Page 1 of 2 12 LastLast
Results 1 to 13 of 20
  1. #1
    Join Date
    Jan 2011
    Location
    Carol Stream, IL
    Posts
    11

    Confused RTU 48TJE KEEP FREEZING

    Hi everyone, hard to learn something new by itself, unfortunately that is my case. I was checking an carrier RTU and i could not figure out why was keep on freezing on me. Finally I evacuate all the refrigerant and came up that the amount of refrigerant was exactly the exactly the same as the label in the unit said, 7.9 lb. So I got to the point to assume that it was getting freeze up because the inside of the building was not to hot???? because, nothing else was wrong. All tips will be greatly appreciated.

  2. #2
    Join Date
    Jun 2010
    Posts
    167
    I doubt a low load would cause it to freeze up. Check your air flow, blower motor, and duct work.

  3. #3
    Join Date
    Jan 2011
    Location
    Carol Stream, IL
    Posts
    11
    Thank you. I did and everything seems to be find. That's why I was wondering if outside temp will affect that.

  4. #4
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,433
    Did you take any readings on the unit other than pulling the charge and weighing it?

    The answer lies within that data.

  5. #5
    Join Date
    Dec 2010
    Location
    new jersey
    Posts
    364
    Fire damper slammed shut....happened to me.

  6. #6
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    17,942
    We need all the numbers.

    You did gather the numbers, right?

    For example, the temp diff across the evaporator when it was thawed and recharged.

    Superheat.

    Subcooling.

    Outdoor and indoor.

    Stuff like that.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

    AOP Forum Rules:







  7. #7
    Join Date
    Sep 2009
    Location
    Boyertown, Pa
    Posts
    50
    More info needed. What was the outdoor temp? Is there a fan speed control for the condenser motor for cool weather operation?

  8. #8
    Join Date
    Jan 2011
    Location
    Carol Stream, IL
    Posts
    11
    Thank you every one for your advice, I really apreciate it. Is hard when you have to learn in your own. But thanks God and those who create HVAC TALK !!!!!!!!!!!!!!!. Thank you again.

  9. #9
    Join Date
    Jul 2008
    Location
    Denver, CO
    Posts
    4,229
    I've had a lot of problems with the headers plugging up on those units.

  10. #10
    Join Date
    Feb 2010
    Location
    Howell, Michigan
    Posts
    143
    Before you emptied the units freon did you check temperature on both sides of the liquid line filter dryer to see if there was a temp difference? The filter dryer could have debris or to much braising leaked silfloss into filter itself creating a restriction How old is the unit?
    Good Luck! Kimosobee

  11. #11
    Join Date
    Jan 2011
    Location
    Carol Stream, IL
    Posts
    11
    Thank you, and yes I did check the filter, it was ok. no difference in temp.

  12. #12
    Join Date
    May 2011
    Location
    West Virginia
    Posts
    4

    Your problem is it is a Carrier!

    Tell them that they should look at getting a Lennox. Ha-ha-ha!

  13. #13
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    17,942
    Quote Originally Posted by Assassin View Post
    Tell them that they should look at getting a Lennox. Ha-ha-ha!
    Everyone has an economic point-of-value. Lennox is not the right choice for some retail clients.

    As far as durability, I replace just as many condenser fan assys on Lennox as I do Carrier. In fact, I was at a location last Monday with seven bad fans out of five RTU's. Today, I replaced a completely blocked, and I mean 100% blocked filter dryer in an LGA.

    Good units? Sure. Perfect? No way even close. In fact, come winter, those JCI blue boxes are a staple of my no-heat calls on Lennox units.

    I'm gonna miss the blue boxes....
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

    AOP Forum Rules:







Page 1 of 2 12 LastLast

Tags for this Thread

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