How to Calibrate a T8112 Thermostat

The T8112 Thermostat from American manufacturer Honeywell is a thermostat for home use. As of this writing it is a discontinued model, but some private retailers still have it in stock. It can be used to control temperature settings for air conditioners and heating systems. This thermostat can be programmed for precise temperature control as well as to specify the time of day when the system is to be in operation. Eight simple programming buttons are used to program the Honeywell T8112. The procedure is familiar to anyone who has programmed a video player or remote control.

2 alkaline or lithium AA batteries

Instructions

- 1
  Replace or install the thermostat batteries if they are low or dead, or if this is the first time you are using the thermostat. Turn the thermostat off by sliding the switch at the lower right hand corner of the device to the "off" position, which is between "cool" and "heat."
- 2
  Remove the battery door to the left of the control panel using a coin. Press down on the left ends of the batteries to remove them, and insert new batteries so that the positive terminal of the top battery points to the left and that of the bottom battery points to the right. Replace the battery door and turn the system switch to "Heat."
- 3
  Press and release the "clock/day" key at the top left of the bank of keys once, and press the up and down arrows to the right of it until the right time appears.
- 4
  Press and release the "clock/day" key again and press the up and down arrows until the right day of the week appears.
- 5
  Press the "Run Program" key, located at the top right of the bank of keys, once.
- 6
  Press and release the "Schedule" key, located below the "Clock/day" key, once and wait for the display to show the words "wake," "Mon-Fri" and "set."
- 7
  Set the "wake" time by pressing the up or down time keys to your wake-up time. Set the "wake" temperature using the up and down "temp" keys located to the right of the time keys.
- 8
  Repeat Step Six and Step Seven to set the "leave", "return" and "sleep" times that correspond to the hours when no one is in the house, when you and your family return home and when you are sleeping.
- 9
  Set the weekend schedule by pressing the "Schedule" key until "sat," "sun," "wake" and "set" appear on the display. Program the wake and sleep times for Saturday and Sunday by repeating Step Seven twice.
- 10
  Slide the system switch at the bottom right of the thermostat to "cool" (the left position) and repeat the above four steps for the weekday and then the weekend cooling schedule.
- 11
  Adjust the fan and system switches for the desired heating, cooling or ventilation mode, then press and release the "Run Program" key.

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