STE-6012/6016 Room Temperature Sensors
2
Application Guide, AN0412C Rev. B
Overview
Each STE-6012/6016 includes an LCD display for
the room temperature and setpoint, which can be
toggled between Fahrenheit (the default) and Celsius
scales. The sensor allows a user to adjust the setpoint
via the Up and Down arrow buttons on the front
panel.
If the system is in
occupied/normal mode (12 VDC
applied to terminal D or the green wire)
, press-
ing a button will raise or lower the setpoint. When
either button is pushed, the display will toggle from
room temperature to the setpoint. The setpoint will
increment or decrement (a degree with each press)
depending on the button being pressed. When the
button is released, the number displayed is the new
setpoint, and the display will return to room tem-
perature after ten seconds.
If the system is in
unoccupied/setback (for heating
or setup for cooling) mode (7.5 VDC applied to
terminal D or the green wire)
, pressing either but-
ton also selects override mode (and “OVERRIDE” is
shown on the LCD display).
NOTE: Pressing the
Down button
momentarily
sends
0 VDC
to the controller (via the
C terminal or the orange wire) for a
SENSORON
signal; pressing the
Up
button
sends
greate
r than 5 VDC
for a
SENSOROFF
signal.
Controller Connection
For the STE-6012/6016, the
controller
will need signal
lines for two inputs (thermistor and setpoint), one
output (7.5/12 VDC supply), and common (ground).
Since each STE-6012/6016 has 0–5 volt DC outputs
for both the temperature and the setpoint lines,
turn OFF the corresponding 10,000 ohm pull-up re
-
sistors on the controller board!
Consult the control-
ler’s setup instructions for information on turning off
the pull-up resistors. (For the other STE-6000 series
sensors, do
not
turn off the resistors on the controller
board as stated for the STE-6012/6016.)
NOTE:
For controller configuration instructions,
see the appropriate section in the Controller
Configuration section.
Fahrenheit/Celsius Display Selection
The STE-6012/6016 has an LCD display for showing
room temperature and setpoint. The display can be
toggled between Fahrenheit (the default) and Celsius
scales by performing the following procedure.
NOTE: Doing this
erases any stored calibration
offset value
(see below) and returns the
calibration to the default setting!
1. Press and hold either the Down or Up arrow
buttons for at least 20 seconds. The display will
toggle from one temperature scale to the other.
2. Release the button.
NOTE: This setting is written to nonvolatile
memory and will be saved even if power to
the sensor is lost.
Displayed Temperature Calibration (Offset)
NOTE: The total offset value is limited to +/– 3
degrees from the default value.
The temperature value displayed by the STE-
6012/6016 may be fine-tuned if desired by
performing the following steps. The sensor must be
in a stable location and operating at least ten minutes
before calibrating. Hold an accurate thermometer
about an inch under the unit as a reference during
this procedure.
1. Click the Down arrow button to decrement the
setpoint to its lowest value, 40° Fahrenheit or 4°
Celsius, then press and hold the Down arrow
button.
2. After holding the Down arrow button for about
ten seconds, the display will start flashing
the room temperature value and start an
approximately 15-second “exit calibration” timer.
NOTE: Entering the calibration mode erases any
previous saved offset value and will return
to the default setting.
3. While the room temperature value is flashing,
press the Up or Down arrow button to modify the
room temperature value. Each press of the Up or
Down arrow button will change the temperature
value by one degree.
4. The display will continue to flash for approxi
-
mately 15 seconds after the last button press.
Then the STE-6012/6016 will write the modified
value to memory and return to normal operation.
NOTE: This procedure affects only the temperature
displayed on the LCD screen. It does
not
affect the calibration or temperature value
in the controller.
Sensor Configuration
