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Old 10-15-2011, 08:42 PM   #1
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Heat pump thermostat balance point.


Very helpful forum.
I had an issue this past winter when my heat pump broke down (3 years old). Called a tech and he replaced the low pressure switch. The one he installed did not work either so he installed a different one. The second time around he told me that with the low pressure switch he installed, I should not run the heat pump when it is below -18c (about 0F). He said that since my heat pump was not equipped with a thermostat (which he could install for 300$) I would have to only run AUX heat when very cold or risk problems with the compressor. Not wanting to give this guy any more money, I sent him on his way and decided to upgrade my thermostat with a model that has an external temperature sensor and can lock out the compressor.

My question is. The thermostat (Aprilaire 8570) I installed has a setting for low balance point (temp to lockout compressor) and high balance point(temp to lockout AUX heat). Should I use -18c (0F)for low, which the tech suggested, or is this a number specific to my heat pump? What should I use for the high balance point (or leave it OFF)?

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Old 10-16-2011, 05:24 AM   #2
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Heat pump thermostat balance point.


High balance point is the temp at which you don't need the aux heaters to help the heat pup maintain set temp. Could be 15, 20, 24 degrees F etc. Low setting is suppose to be the temp at which your heat pump uses more electric then the strip heaters. This could be 0 or -10F.

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Old 10-16-2011, 02:45 PM   #3
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Heat pump thermostat balance point.


Thanks for the response. I understand what the terms mean. What I'm asking is I how go about finding the high and low balance point temperatures.
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Old 10-16-2011, 03:03 PM   #4
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Heat pump thermostat balance point.


Generally, its suppose to be done by a load calc and then taking the performance charts of the heat pump, you make up a balance point graph, and plot it.

If you don't have a load calc, or the performance charts. You wing it, and just try a low temp for the heat pump lock out. If it can't keep up, you know to set it higher, if it keeps up, you try a lower setting.
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