Results 1 to 6 of 6
  1. #1
    Join Date
    Sep 2010
    Location
    Indiana
    Posts
    732
    Post Likes

    BQ Cartridge Selection

    Hello,

    I have had a BQ kit for some time but have never needed it.

    I am putting one on a small cooler. 4600 BTU R22.

    AAA Cartridge is 1/8 - 1/3 ton (1500 - 4000)
    AA Cartridge is 1/2 - 2/3 ton (6000 - 8000)

    Do I round up or round down?

    Thanks!

  2. #2
    Join Date
    Jul 2019
    Location
    Oklahoma home its in the name
    Posts
    1,015
    Post Likes
    Sorry for the elementary question but what is a BQ cartridge?

    Sent in a state of increasing entropy using Tapatalk

  3. #3
    Join Date
    Sep 2010
    Location
    Indiana
    Posts
    732
    Post Likes
    Thread Starter
    Quote Originally Posted by R600a View Post
    Sorry for the elementary question but what is a BQ cartridge?

    Sent in a state of increasing entropy using Tapatalk
    Sporlan TXV kit. You build it from a body, power element, and cartridge to fit your need.

  4. Likes R600a liked this post.
  5. #4
    Join Date
    Aug 2013
    Location
    Omaha
    Posts
    3,214
    Post Likes
    A. When in doubt, pick the smaller size. Itll throttle better and you wont have hunting from too big of a valve.

    B.. remember refrigerant choice matters in picking cartridge size. Sporlan has a chart for which size to use. Compare r12/134a to r22 or 404a. Quite a difference

    Sent from my SM-G975U using Tapatalk

  6. Likes VanMan812 liked this post.
  7. #5
    Join Date
    Jan 2010
    Location
    Sea to Sky
    Posts
    3,525
    Post Likes
    Stop guessing and follow Sporlan's selection criteria.....Bulletin 10-10

    https://www.google.ca/url?sa=t&sourc...LvJXknyblNxsZI

    Sent from my SM-G965W using Tapatalk

  8. Likes icemeister, UmmScott liked this post.
  9. #6
    Join Date
    Jul 2000
    Location
    Guayaquil, EC
    Posts
    14,308
    Post Likes
    The BQ AAA cartridge should work well. If you go to Bulletin 10-10 and do the recommended selection procedure you'll find the corrected capacity is often higher than the nominal capacity of the cartridge.

    In this instance, since you have a small cooler with a R22 compressor capacity of 4600 Btuh, I''ll assume a 20F evaporator temperature and 110F liquid temperature and 200 psi available pressure drop across the TXV.

    NOTE: If the evaporator has a distributor you need to deduct the pressure drop of the distributor nozzle and the distributor tubes which would be approximately 35 psi. In this case however, the capacity is too low to require a distributor.

    The nominal capacity for a AA cartridge is listed as .38 tons, the liquid temperature correction factor is .94 and the pressure drop factor is 1.26, so multiplying those out I get a corrected capacity of .45 tons or 5400 Btuh.

Posting Permissions

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