Page 1 of 2 12 LastLast
Results 1 to 13 of 17
  1. #1
    Join Date
    Oct 2011
    Location
    Gladstone, Oregon (Portland)
    Posts
    1,998
    Post Likes

    JPR-2 jumper....Trane

    Was on with tech support today and he had me cut the JPR-2/term jumper on the board to initiate a longer defrost. Anyone have specific numbers and criteria for doing this?

  2. #2
    Join Date
    Jan 2012
    Location
    Broomall, PA
    Posts
    2,942
    Post Likes
    What did 'he' say when you asked him?
    If I do a job in 30 minutes it's because I spent 30 years learning how to do that in 30 minutes. You owe me for the years, not the minutes.

  3. #3
    Join Date
    Oct 2011
    Location
    Gladstone, Oregon (Portland)
    Posts
    1,998
    Post Likes
    Thread Starter
    Quote Originally Posted by STEVEusaPA View Post
    What did 'he' say when you asked him?
    He didn’t say actual numbers. He just said it will run defrost longer to be more thorough and get all of the frost off before it terminates. He also said that Trane is very secretive about there defrost algorithms so he didn’t know the exact ambient/indoor sensor and delta T thresholds to initiate and terminate defrost.

  4. #4
    Join Date
    Jan 2012
    Location
    Broomall, PA
    Posts
    2,942
    Post Likes
    Sounds like he didn't know either. Gotta be someone on here who knows the secret sauce.
    If I do a job in 30 minutes it's because I spent 30 years learning how to do that in 30 minutes. You owe me for the years, not the minutes.

  5. #5
    Join Date
    Aug 2009
    Location
    Beatrice, NE
    Posts
    10,221
    Post Likes
    Are you talking a T/T defrost control or Demand?

  6. #6
    Join Date
    Oct 2011
    Location
    Gladstone, Oregon (Portland)
    Posts
    1,998
    Post Likes
    Thread Starter
    It’s a learning board. But the algorithms are a secret. Demand defrost.

  7. #7
    Join Date
    Aug 2009
    Location
    Beatrice, NE
    Posts
    10,221
    Post Likes
    I think it changes the termination temp by 5 or 10 degrees. Couldn’t find it in the book on a quick run through.

  8. #8
    Join Date
    Oct 2011
    Location
    Gladstone, Oregon (Portland)
    Posts
    1,998
    Post Likes
    Thread Starter
    Quote Originally Posted by BNME8EZ View Post
    I think it changes the termination temp by 5 or 10 degrees. Couldn’t find it in the book on a quick run through.
    I know what the jumper does. Changes it from 47 to 70 degrees. I just want some answers on what is more efficient.

  9. #9
    Join Date
    Jan 2004
    Location
    PA
    Posts
    78,377
    Post Likes
    Quote Originally Posted by Adlerberts-Protege View Post
    I know what the jumper does. Changes it from 47 to 70 degrees. I just want some answers on what is more efficient.
    If the coil is completely thawed/frost free, than a short defrost time is more efficient. If its not completely frost free in a short time, than a longer defrost time is more efficient. As you get more heat from a completely frost free coil, than one that still has frost/ice on it.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  10. #10
    Join Date
    Oct 2011
    Location
    Gladstone, Oregon (Portland)
    Posts
    1,998
    Post Likes
    Thread Starter
    Quote Originally Posted by beenthere View Post
    If the coil is completely thawed/frost free, than a short defrost time is more efficient. If its not completely frost free in a short time, than a longer defrost time is more efficient. As you get more heat from a completely frost free coil, than one that still has frost/ice on it.
    I get all that but what I want to know is if it is climate dependent or what there reasoning is for having this jumper than can be cut. I would imagine in my climate(a colder one) it makes more sense to cut the jumper. I just would like some hard data or something on paper stating this. All the higher ups in the Trane world are very secretive about these things.

  11. #11
    Join Date
    Jan 2004
    Location
    PA
    Posts
    78,377
    Post Likes
    Depends on how moist the areas winter is.

    A cold dry climate area doesn’t usually need a long defrost cycle.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  12. #12
    Join Date
    Oct 2011
    Location
    Gladstone, Oregon (Portland)
    Posts
    1,998
    Post Likes
    Thread Starter
    Quote Originally Posted by beenthere View Post
    Depends on how moist the areas winter is.

    A cold dry climate area doesn’t usually need a long defrost cycle.
    I figured that too but the reps I talked to (3), all know Central Oregon well (dry and cold), and all told me to cut the jumper. Hmmm.

  13. #13
    Join Date
    Jan 2004
    Location
    PA
    Posts
    78,377
    Post Likes
    Well, they may be guessing at the cause and cure. Is your area commonly windy?
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •