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I'm having some unusual issues with staging on my Ecobee Smart Thermostat and I was wondering if others have seen the same things.
I have a Ecobee Smart Thermostat (bought and installed just before E3 was announced, sigh) hooked up to a 2-stage geothermal heat pump with electric aux heat. System is configured with reverse-staging, stage 2 cutin is -2 F from setpoint, aux heat cutin is -5 F from setpoint. Electric aux heat is configured with a 5 minute minimum runtime, simultaneous compressor and aux heat are enabled, compressor minimum runtime is 10 minutes).
I've been experiencing two strange issues with the staging:
The use of aux heat seems to push the system into conventional staging. Based on my staging strategy, falling below 5 degrees from setpoint should result in enabling aux heat until the 5 minute runtime is met and the temperature is <5 F from setpoint. At that point, the system should stage down to stage 2. However, instead of staging down, the thermostat keeps the unit at stage 2 with aux heat on until setpoint is met.
Aux heat will sometimes engage with only compressor stage 1 on when returning to setpoint. This behavior appears to occur when the setpoint is changed and temperature is >5 degrees from setpoint. This is unexpected based on the staging described above.
Has anyone experienced similar issues? I really appreciate any help you can provide.