Page 1 of 3 123 LastLast
Results 1 to 13 of 34
  1. #1
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    5,798
    Post Likes

    Freeze pump on 100% OAU

    Installed a freeze pump for a 100% OAU. Dual temp coil. It has frozen 2 years in a row. More pics to come.

    Motor starter has HOA. Hand runs pump 24/7. Auto runs thru a Tstat set at 40* to run the pump even unoccupied.




    Sent from my iPhone using Tapatalk

  2. #2
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    5,798
    Post Likes
    Thread Starter
    New piping from the tee on the supply to the bottom of the actuator flange on return


    Sent from my iPhone using Tapatalk

  3. #3
    Join Date
    Oct 2016
    Posts
    1,251
    Post Likes
    What happens if the pump knocks off? There should be a freeze stat to shut off the fan and open the valve for full flow if the temp get below 38 deg anywhere in the air stream. Just finished a similar job and I had the control guys bring the pumps on at 45 deg just to make sure no freeze stat trips.

    Face and bypass coils are the best for 100% oa units. Just open the valve 100% and modulate how much air goes through the coil. Especially with a steam coil.

    Pipe work looks good.

  4. #4
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    5,798
    Post Likes
    Thread Starter
    The unit has a freeze stat that;

    Closes o/a damper. Opens control valve 100%. Shuts the fan off.

    I tested operation and verified it worked. First time seeing the unit, the county takes care of it.

    I installed new coil and a freeze pump per their request.


    Sent from my iPhone using Tapatalk

  5. #5
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    5,798
    Post Likes
    Thread Starter



    Sent from my iPhone using Tapatalk

  6. #6
    Join Date
    Nov 2014
    Location
    Northern Idaho
    Posts
    981
    Post Likes
    That is some clean work Gravity!

    Nice job on adding OC protection to the control circuit since it leaves the panel


    Sent from my iPhone using Tapatalk

  7. Likes gravity liked this post
  8. #7
    Join Date
    Mar 2005
    Posts
    1,249
    Post Likes
    use oily rag on pipe to prevent solder drips?
    Keep it simple to keep it cool!

  9. #8
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    5,798
    Post Likes
    Thread Starter
    Quote Originally Posted by stanbyyourword View Post
    use oily rag on pipe to prevent solder drips?
    Just dont drip


    Sent from my iPhone using Tapatalk

  10. #9
    Join Date
    Mar 2005
    Posts
    1,249
    Post Likes
    Good job then 😎

  11. #10
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    5,798
    Post Likes
    Thread Starter
    Quote Originally Posted by stanbyyourword View Post
    Good job then
    Actually, if i have a drip about to occur, i wipe/flick it with my finger on my pants. Lol


    Sent from my iPhone using Tapatalk

  12. #11
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    24,414
    Post Likes
    Pro Press all the way now!

    Nice Job as well!

  13. #12
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    5,798
    Post Likes
    Thread Starter
    Quote Originally Posted by pecmsg View Post
    Pro Press all the way now!

    Nice Job as well!
    Dislike


    Sent from my iPhone using Tapatalk

  14. #13
    Join Date
    Nov 2014
    Location
    Northern Idaho
    Posts
    981
    Post Likes
    Quote Originally Posted by gravity View Post
    Dislike


    Sent from my iPhone using Tapatalk
    curious what type of solder you use?

    How did you select the pump?
    Last edited by GoCougs; 08-24-2019 at 11:46 AM.

Page 1 of 3 123 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
  •