T-EF-SERIES
DIGITAL ROOM CONTROLLER
Version: 2002-02 Page 2/ 4
point is indicated by pressing the UP or DOWN key once. The set point will be changed,
if either one of this keys is pressed again within 2 seconds. The two-digit display will
return to indicate the room temperature after 2 seconds if no key is pressed.
3. Manual Control
The air volume can be manually adjusted by pressing
the MANUAL/AUTO button once while in auto mode.
The lower status LED will light up green. The two-
digit display will show the degree of the opening of
the damper from 0 -90°. The damper can be
positioned with 5° steps by pressing UP or DOWN
buttons.
4. Switching OFF
The unit is switched off by pressing the POWER
button once.
5. Changing HEATING/COOLING mode.
Pressing the HEAT/COOL button for more than 3 seconds will change the temperature
control mode. The mode of the unit is indicated by the color of the upper status LED.
Green is for cooling and red is for heating.
6. Calibration of P-Band
Warning! Calibration should only be done by experts!
The T-EF offers calibration of the P-band and the running time of the actuator.
Pressing MANUAL/AUTO and HEAT/COOL button together for two seconds starts the
calibration mode. The first step is the setting of the P-Band. Range is 2 -5 ° C. The
setting can be changed by pressing UP or DOWN button. The unit will return to normal
mode, if no key is pressed for two seconds.
7. Calibration of actuator timing
Warning! Calibration should only be done by experts!
Pressing MANUAL/AUTO and HEAT/COOL button together again while in calibration
mode will lead to the setting of actuator timing. The two-digit display indicates the
running time of the actuator in steps of 10 seconds. A display of 15 therefore stands for
150 seconds. Use UP or DOWN key to change the timing. The calibration can as well be
used to fine-tune the outlets in a VAV system. The opening of the damper can be limited
in areas of high pressure by reducing the running time setting of the actuator. Again,
this should only be done by experienced personnel. The unit will reset itself after a
change of actuator timing. The green and red LED will blink alternately and the damper
will be closed.
8. External Temperature Sensor
It is possible to connect an external sensor on the connectors 6 and 7. In order to use
the external connection, the internal sensor has to be removed. This is done by cutting
the legs of the sensor on the PCB. The sensor is marked RT. Use a standard NTC
temperature sensor for the external sensor.
9. Resetting
In order to keep the actuator position accurate at longer operation intervals, the unit is
reset each time the damper is closed. This is done automatically by extending the close
signal by 10s.
10.Power Failure
In case of a power failure the unit will close the damper at the resumption of power.
The status LED's will blink alternating red and green. The closing time depends on the
setting of the controller. (See point 7). The unit will remain in the OFF position after
closing. When switching on, the last recorded operation mode will be activated. All the
settings and set points are memorized and will not have to be re-entered.
Two digital LED
number displays
indicate room -and
setpoint temperature.
The upper LED on the right side of
the display indicates heating (red) or
cooling (green) mode. The lower LED
shows manual operation (green)
