Results 1 to 5 of 5

Thread: Heat pump Txv

  1. #1
    Join Date
    Mar 2003
    Location
    Brooklyn, Ohio
    Posts
    102

    Heat pump Txv

    We have a customer that has an Ameristar Heat pump. Outdoor M/N 2A6B0024A1000AB Indoor air handler M/N TWG025A140B1. This is installed in a condo with the air handler on the 5th floor and the outdoor unit on the 12th.(roof) All of the units were installed with pistons as metering devices. There have been a number of problems including leaks and dirty indoor coils. Another company came out before we did and said the system needed a TXV installed and that would take care of it. My question is will it really make a difference? There are about 110 units here and most if not all of them have pistons. We had to clean drywall from the coil,and do a leak check and repair.
    This customer is asking why we are not recomending a TXV also.
    Thoughts?

  2. #2
    Join Date
    Jun 2008
    Location
    Monroe Ga
    Posts
    77
    Are these R 410a systems? If so...To be "text book" with these they require TXV's

  3. #3
    Join Date
    Mar 2003
    Location
    Brooklyn, Ohio
    Posts
    102
    Sorry>> R22

  4. #4
    Join Date
    Jan 2008
    Location
    Elkton, MD
    Posts
    141
    You have exceeded the maximum (35PSI) liquid line pressure drop for this system.
    This application will require a subcooler, sump heater, and indoor txv for maximum reliability.
    Please contact the field service representative at your local American Standard or Trane distributor to obtain a copy of of the Refrigerant Piping Application manual which includes specific instructions for High Rise Applications.

  5. #5
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    66,824
    Quote Originally Posted by hvac-master View Post
    You have exceeded the maximum (35PSI) liquid line pressure drop for this system.
    .
    With condenser on the 12th floor, and air handler on the 5th floot. There is no vertical pressure drop on the liquid line.

    The pressure increases .5PSIG for every foot of vertical drop.

    The piston is seing more pressure then his guages read at the condenser service valve.

    A TXV or or properly resized smaller piston will help.
    Contractor locator map

    How-to-apply-for-Professional

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

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