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Sunday, 22 June 2008

How to change the temperature scale on a Honeywell T6575 Thermostat

Posted on 14:29 by Unknown

[The complete documentation can be found at http://customer.honeywell.ca/techlit/pdf/95c-00000s/95c-10897.pdf]

 

This was bugging me for a while - the thermostat in my condo was configured to display in Fahrenheit.  I had removed the device figuring there would be a jumper or dipswitch on the back, but I had assumed incorrectly.  It turns out this device contains an EEPROM for storing configuration data.  Getting into the setup is relatively straight forward.

T6575B1003

  1. Change the temperature set point to 10C or 50F.  If it will not go this low then the minimum set point has been modified - you can access setup by selecting the lowest your device will go.
  2. Wait about 3 seconds until the room temperature is displayed
  3. Press and hold the UP and DOWN buttons until tS is displayed
  4. Press  UP once to show the current setting, press UP again so that it changes to Celcius.
  5. Press DOWN to commit your change.
  6. Continue pressing DOWN as you cycle through the available options (db, OP, uC, uH, CO, CL, HL, ES, rt) until you reach rT.
  7. Press DOWN once more and the unit should return to the current room temperature display, this time in the scale of your choice!
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