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Honeywell RedLink thermostats have different Deadbands. Why?

Old_Army_Guy
Old_Army_Guy Member Posts: 1
in A-C, Heat Pumps & Refrigeration
Why do the two Honeywell RedLink thermostats have different Auto Changeover Deadband factory settings? The THX9421R5021WW comes preset to 5°F and the TH821R1001 comes preset to 9°F. I am installing both on two air-to air heat pumps in south Florida. Heat pumps are Trane single stage heat with electric backup and single stage cool. Should I leave the Auto Changeover Deadbands at factory settings or make both the same?

Comments

  • ratio
    ratio Member Posts: 3,910
    Are you talking about the enforced deadband between the cooling setpoint & heating setpoint. That is 3* in the 8000 series as shipped from the factory, I'm not sure about the 9000 series, but I'd guess 2 or 3*.
  • ChrisJ
    ChrisJ Member Posts: 16,465
    I'd make them both the same.

    Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.

  • SWEI
    SWEI Member Posts: 7,356
    Assuming those figures really are correct, I'd suspect this could well be due to fubmlefingering somewhere by the manufacturer. 5°C = 9°F.
  • ratio
    ratio Member Posts: 3,910
    FWIW, I just found out that if an 8321U is programmed for dehumidification by cooling droop, the deadband range changes from 3-9 to 5-9 *F.

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