TFC Group Towerstat REM STT/REM - Manual (Page 10)

Battery Installation
Your thermostat uses two (2) “AA” size alkaline batteries. To power-
up the unit, insert two “AA” batteries into the battery compartment.
Be sure to observe correct polarity (+ and -).
When power is applied for the first time, the display should show the
time and the day as well as the room temperature (for example 28.5˚C)
as follows:
9
2 3 Span
ON ON +/- 0.25 ¼C
ON OFF +/- 0.5 ¼C
OFF ON +/- 0.75 ¼C
OFF OFF +/- 1 ¼C
ON
1 2 3