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Control strategies for heat pump

Vince_4
Vince_4 Member Posts: 6
in THE MAIN WALL
If you were to add a back-up boiler, I assume it would be controlled to start and stop based on the tank temp. and demand. Is anybody using temp. differential with outdoor reset? Does that cause any nuisance boiler starts, which take away from the efficiency of the heat pump?

Comments

  • Vince_4
    Vince_4 Member Posts: 6


    I read in a prior post that a lot of geothermal heat pump systems are being set up with boilers for back-up radiant heat. I assume that's with the heat pump and boiler tee'd into a buffer tank. Does any have any "ideal" system diagrams or pics? What typically controls the boiler? I'm imagining a heat pump maintaining a buffer tank at a designated temp. What if outdoor reset is used? There doesn't seem to be many options for heat pump control, so I'm curious what strategies have been used.
  • Brad White_9
    Brad White_9 Member Posts: 2,440
    See Siggy's books and articles.

    If you want diagrams, John Siegenthaler and company has it covered. See "Modern Hydronic Heating" among other resources as one place to start.
  • Craig R Bergman
    Craig R Bergman Member Posts: 100
    We have...

    not had to use back-up heat on water to water Geothermal.
    Our latest home is 10,000 Sqft, 22 zones of Radiant heat and three Heat Pumps. (Really only two GSHP's.) One of the Heat Pumps is for the theater so it can cool in the winter.

    Bergy
  • zac_2
    zac_2 Member Posts: 32
    outdoor reset

    we've been using standard tekmar outdoor reset controls (256 single stage and 261 two stage) on our hydronic geo systems as well as the new tN4 system with great success. we don't usually install any backup heat source on our systems except for the elements in our "buffer tanks" (we use electric HWT's for this duty as there are no tanks that adequately serve this purpose on the north american market yet, but thats another story)

    why not plug your auxilliary boiler into the second (or third) stage output on a multi-stage boiler control such as a tekmar? it will only bring on the aux if the previous stages are taking too long to come up to temperature (and i believe the allowed time delay is adjustable). that should eliminate your nuisance boiler fires.
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