Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Pump sizing

CBRob
CBRob Member Posts: 276
edited September 2023 in THE MAIN WALL
Been learning a bit about pump sizing and the goal of going for the highest delta T allowed by the manufacturer.

Regarding the 155 unit, 

In this chart, is the wrong grundfoes pump listed for the relative Delta T?

Wouldn't the 26-99 pump  more ft per second or gpm than the 15-58? 
For a 20 degree rise use the more powerful pump, for a 30 degree rise use the slower pump?


Comments

  • Teemok
    Teemok Member, Email Confirmation Posts: 652
    The 155 20F delta 15-58 pump should be in the 30F delta slot? Looks like a mistake.
  • Zman
    Zman Member Posts: 7,609
    Get an ECM Delta T circ and let it do it’s job. Some boilers (Lochinvar sometimes) come with a 0-10 VDC circ and handle it with the onboard controller.
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
  • GroundUp
    GroundUp Member Posts: 2,007
    There was a mistake in the chart
    CBRob
  • CBRob
    CBRob Member Posts: 276
    Thanks, had me wondering.

Categories