Hi folks, I got a heat pump installed at my home and I’m looking to better understand when/how it switches over to backup fuel in the winter.
My unit is the LENNOX ELITE EL18XPV SERIES, which I found heating specs on here
It is installed in conjunction with a heating oil fired boiler and an aqua coil as the backup heat source. When it was installed, I asked, and the installer indicated that the heat pump will switch over to the boiler at about 37F. What I don’t fully understand though, is that this unit was billed as a variable speed/inverter, so it seems it should be able to run at lower temperatures than 37. The website above seems to indicate it should produce 31,800 BTU/h at 17F, so can I set the “switch-over” temperature of outside to be lower to use less oil?

  • @bbbbbOPEnglish
    1•1 year ago

    Hey, so I have an s30 lennox thermostat. For anyone who runs into this in the future, I actually managed to find it in settings under 'heat & cool" and “balance point auxiliary heat”. It seems my heat pump is intended to work at the same time as auxiliary heat when it’s inside a certain temperature range, switching over to auxiliary heat entirely once it gets to the lower number