buffer tank cooling temperatures

Discussion in 'General Discussions' started by csmeutah, Jul 7, 2022.

  1. csmeutah

    csmeutah New Member

    I see lot's of discussions around the heating temperatures for a buffer tank, but what are the recommended temps (setpoint and differential) for hot weather cooling? I have a 4 ton Econar W2W system and it is currently running at 40F setpoint and I vary the differential 4 - 10 degrees based on outdoor temps. Mostly I'm wondering if 40F is too low for a geothermal system.
  2. wing

    wing Member

    40 is plenty cold.

    Lower setpoint temperature means lower heat pump efficiency but more cooling to your house via the air handler. What are the run times on your heat pump ? Do you need the extra cooling to make your home comfortable ?

    you have antifreeze in your load loop ?

    I’m running at 44 degrees with 3 degrees upper/lower set points.
  3. csmeutah

    csmeutah New Member

    Thanks, setpoint is 40 but the differential is only upper so kicks in at 44 and stops at 40 . If I find the heat pump running multiple times for one tstat call I increase the differential so it is not starting and stopping multiple times per call. No antifreeze in the load loop, technician recommended against it locally.

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