Pennsylvania Need Help

Discussion in 'Maintenance and Troubleshooting' started by Scott B, Dec 11, 2019.

  1. Scott B

    Scott B New Member

    I have a vertical closed non pressure system w 2 command aire heat pumps. They are controlled by 2 Ranco temp controllers. When heat is called Heatpump one kicks on, and after timer delay, heat pump 2 kicks on but will only run for about 30 seconds. And turns off. I was worried thinking compressor was bad but....I unhooke safety switch wire on HP1. (Running Heat pump) Called for heat, heard contractors click but compressor didn’t start because switch unplugged, after timer delay HP 2 fired up and ran perfectly heating buffer tank as it should. This tells me unit is fine. Question why won’t both run together like it’s designed to. System is 12-13 years old. Once winter kicks into full gear, one pump can’t keep up and ancillary heat will destroy electric bill. I’m thinking temp controller but any suggestions appreciated.
     
  2. wing

    wing Member

    What is your closed loop flow rate through each pump ? Maybe there is not enough flow for the two heat pumps to run simultaneously? Thus the second pump locks out with low flow error after running 30 seconds.
     
  3. Scott B

    Scott B New Member

    Don’t know actual rate but each loop has 2 stacked up 26-99 pumps. Being that it runs by itself and each loop has their own pumps I assumed flow rate would be fine but not sure. I can check the pumps.
     
  4. wing

    wing Member

    The two heat pumps share the same closed loop - correct ?
     
  5. Stickman

    Stickman Member Forum Leader

    The way I read this is as 2 separate loops, each with two 26-99s.
     
  6. ChrisJ

    ChrisJ Active Member Forum Leader

    He might have meant to say each heat pump has it's own pumps.

    Can you switch which controller controls which heat pump? To see if it's the #2 controller.
     
  7. Scott B

    Scott B New Member

    Two 2699 to each heat pump but share same loop
     
  8. Scott B

    Scott B New Member

    Pic of loop
     

    Attached Files:

  9. Scott B

    Scott B New Member

    Pic of controls/tank
     

    Attached Files:

  10. wing

    wing Member

    What are the specifications on the ground loop ? Pipe size and length ? You have nine boreholes - correct ?
     

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