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Issue Date: 22.01.2020
Thermokon Sensortechnik GmbH, Platanenweg 1, 35756 Mittenaar, Deutschland · tel: 02778/6960-0 · fax: -400 ·
LCF02-Touch_3AO2DO_Datasheet_en.docx © 2020
Operating mode
Press the “Mode Key”
, to adjust the mode cyclically (Cooling > Ventilating > Auto mode > Heating …).
In 2-pipe configuration not available modes (depending on the change-over sensor’s signal) will be skipped. In this case the user can select the
available modes only.
Standby / ECO / ON
The Power-Button switches the device from Stand-by to ON. In Standby the display is off, but the control loop is actively monitoring the
temperature and will activate the heating output if the room temperature drops below the frost protection threshold.
In case the external sensor is configured as a temperature limiter, the heating valve will be closed in case the threshold value will be exceeded.
Besides the frost protection the device shall monitor a high limit as well in case the external sensor input is configured as a temperature limiter.
This is the case for floor heating systems, where the external sensor is embedded in the floor. In case the floor temperature will exceed a certain
threshold the heating valve shall be closed to avoid damaging the floor or the pipes embedded in the floor.
Pressing the button once switches the display on and the device to ECO mode. In ECO mode it controls the room temperature to the setpoint
predefined by register 275 and 276 (0x0113, 0x0114). The display will show the average of both ECO Setpoint Temperatures (25+18 /2=
21,5
) and
the leaf symbol to indicate the ECO mode. In ECO mode the setpoint is fixed and the device does not react to any button pressed by the user
besides pressing the Stand-by /ECO/ON button a 2nd time. Then it will switch from ECO to comfort mode. To indicate that the Fancoil thermostat
is in ECO mode it will show the leaf and the word ECO in the display.
In case an occupancy sensor is connected to one of the inputs the mode will change from ECO to Comfort as soon as the input becomes active
and the previously used Setpoint will be restored and the leaf symbol will not be showing any more.
Temperature sensor input – temperature limiter and external sensor
The temperature sensor input (address 0x0152) can be used as change over sensor (addresses 0x012B and 0x012C) or as external temperature
sensor.
Furthermore, it can also be used to limit the heating temperature (address 0x010A) and cooling temperature (address 0x010B). This is the case
for floor heating systems, where the external sensor is embedded in the floor. In case the floor temperature will exceed a certain threshold the
heating valve shall be closed to avoid damaging the floor or the pipes embedded in the floor.
Fan control
If the fan is configured to be 1-stage or 2-stage the selection will be adapted accordingly. In „ventilating mode“, the valves will be closed. If the fan
speed
is set to Auto the steps are switched depending on the temperature difference between the setpoint value and the current temperature
value.
In auto mode heating or cooling, the fan level is calculated from the output of the PI loop (control variable).
