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Jung FTR231 Floor Thermostat Instruction Manual

1. Safety instructions

Electrical devices may only be mounted and
connected by electrically skilled persons.
Serious injuries, fire or property damage possible. Please read and follow
manual fully.
Danger of electric shock. Always disconnect before carrying out work on the
device or load. In so doing, take all the circuit breakers into account, which
support dangerous voltages to the device and or load.
Danger of electric shock. The sensor cable is connected to the mains voltage
potential. If the sensor cable is damaged, immediately disconnect the device
from the mains by switching off all associated circuit breakers.
This manual is an integral part of the product, and must remain with the end
customer.

2 Device components

Image 1: Device components

1. Room temperature controller insert
2. Frame
3. Status LED
4. Central plate
5. Control knob
6. Adjustment rings for temperature limit

3 Intended use

•  Electronic temperature controller for controlling electric underfloor heating or floor temperature conditioning systems
• Control of the floor temperature in closed rooms
•  Mounting in appliance box with dimensions according to DIN 49073

4 Product characteristics

• Manually setting a comfort temperature for the floor
• Manually switching off the temperature control
• Input terminal for activation of reduction temperature (ECO) via central clock
• External temperature sensor (remote sensor)
• Frost protection function
•  Controller output working method: pulse width modulation (PWM) or two-point switchable
• Interruption of heating for 5 minutes after one hour in continuous heating mode
• Permanent LED operation possible

5.Functional description

ECO operation In many areas of the building it makes sense for the temperature
to be set to a lower ECO temperature at certain times rather than to heat
permanently to the comfort tem- perature. By connecting the input terminal Ø
to 230 V, the temperature is reduced by 4 °C and the status LED lights up
green. This should be controlled by a central clock.

Controller adaptation

Depending on the heating system, the control behaviour can be adjusted.
Pulse width modulated control (factory setting): The output is not permanently
actu- ated, but for a time period (pulse width) that depends on the difference
between tar- get and actual temperature. This method brings the actual
temperature gradually closer to the target temperature.
Two-point control: The output remains switched on until the selected target
temperat- ure has been exceeded by 0.5 °C. The output will not be switched on
again until the target value is undercut by 0.5 °C. Since most heating systems
respond very slowly, this type of control can entail temperature overshooting.

6. Operation

Brief overview

heating mode

green = ECO heating mode

Orange = frost protection (10 seconds)

Display operating mode| … press briefly| 10 seconds.| Red = heating mode

green = ECO heating mode Orange = frost protection

• In permanent operation, the status LED lights up continuously during the active heating phase, but with reduced Increasing or reducing the floor temperature
• Turn the control knob to the right or If the setpoint temperature is not reached, the LED lights up for a maximum of 2 minutes in the colour of the current operating mode. The indication can also take place during the entire heating process (see Activating/deactivating per- manent LED operation). In the middle position, the device regulates to approx. 30 °C target temperat- ure. The lowest target temperature is approx. 5 °C and the highest target tem- perature is approx. 50 °C

Indication of the current operating mode

• Press the control knob

The LED lights up for 10 seconds in the colour of the current operating mode.
Orange = frost protection, red = heating mode, green = ECO heating mode.
Switching off the temperature control

• Press the control knob for longer than 2 seconds until the LED lights up or-

The device has switched to frost protection. The frost protection prevents the
temperature from falling below 5 °C.
Each time the control knob is turned, the LED lights up orange for 10 seconds.

• To activate the temperature control, press the control knob again for more than two

The device switches back to heating mode. The LED lights up red for 10
seconds.

Activating/deactivating permanent LED operation

In permanent operation, the status LED lights up continuously during the
active heat- ing phase.

• Press the control knob for longer than 10 seconds until the LED lights up or flashes in the colour

LED lights up magenta = permanent operation is active

LED flashes magenta = permanent operation is inactive (default setting)

• Press the control knob briefly to switch the
• Press the control knob for more than one second to adopt the displayed After 10 seconds without actuation, the displayed mode is automatically adop- ted.

7 Information for electrically skilled persons

Remote sensor mounting instructions
The remote sensor must meet the requirements of protection class II and be
routed together with sensor cable S03VV in a protective tube. This protects
the remote sensor from humidity and allows for an easier exchange in the event
of repair.
Is the status LED (3) flashes red rapidly, there is an error at the remote
sensor. No temperature measurement, and thus no control, is possible.
If the sensor cable is interrupted or no remote sensor is connected,
continuous heating is carried out. If there is a short circuit of the sensor
cable, heating is not carried out.

DANGER!

Mortal danger of electric shock. Disconnect the device. Cover up live parts.
Connecting and fitting the device Recommended installation height: 1.50 m.

Floor thermostat

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1. External temperature sensor (remote sensor)
2. Switching contact of central clock
3. Electric underfloor heating
4. Connect insert (1) according to the connection diagram (see figure 2). Ob- serve the conductor cross-sections (see figure 3).
5. Optionally, connect the ECO operation input Ø via a switching contact of a central clock (8).

If 230 V is applied to the input, the target temperature is reduced by 4 °C.

• Fit device in appliance box; terminals must be at the
• Fit the frame, central plate and control
• Switch on mains

7.1 Commissioning

Setting control behaviour Factory setting: pulse width modulated control (PWM)
This setting can be used with most heating systems without adaptation.
Changing the settings

• Press the control knob for longer than 20
  The LED flashes green for PWM control and green/blue for 2-point control.

• Press the control knob briefly: The control behaviour is

• Press the control knob for longer than one

The current control behaviour is saved and the setting mode is exited automat-
ically. After approx. 2 minutes without any operation the menu is exited
without sav- ing.
Setting the temperature limits The temperature control has a setting range
from 5 to 50 °C. The adjustment rings in the central plate can be used to
limit the temperature setting range.

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Image 4: Setting the temperature limit (before/after)

• Pull the control knob off the central plate so that the adjustment rings are vis- ible

Pulling off is done by hand or with a suitable tool, e.g. vacuum lifting tool
or key cap puller.

• Turn the large blue adjustment ring clockwise to the desired minimum temper- Each notch corresponds to a change of about 2 °C.
• Turn the small red adjustment ring anticlockwise to the desired maximum tem-

The respective adjustment ring can only be turned in one direction. To return
to the original setting, continue turning to the respective position.

• Replace the control knob, observing the coding (Fig. 4, bottom) of the control knob and rotary

1Technical data

Rated voltage                                               AC 220 … 240 V ~
Mains frequency                                          50 / 60 Hz
Switching current                                        10 A
Connected load
Ohmic load                                                  2300 W
Standby power                                              max. 0.15 W
Ambient temperature                                   -5 … +45 °C
Storage/transport temperature                     -25 … +70 °C
Cable length inputs                                        max. 100 m
Controller class (EU 811/2013)                    IV
Contribution to energy efficiency                  2%
FFNTC remote sensor
Dimensions Ø×H                                         7.8 × 28 mm
Length connecting cable                                 4 m (can be extended
to 50 m) Degree of protection
IP 67
Remote sensor resistance values

Temperature

(°C)

| Resistance

(kΩ)

|  | Temperature

(°C)

| Resistance

(kΩ)

—|—|—|—|—
5| 89.5|  | 30| 26.2
10| 68.8|  | 35| 20.9
15| 53.5|  | 40| 16.7
20| 41.9|  | 45| 13.5
25| 33.0|  | 50| 11.0

The resistance values can only be measured if the sensor is disconnected.

2 Warranty

The warranty is provided in accordance with statutory requirements via the
specialist trade.
ALBRECHT JUNG GMBH & CO. KG
Volmestraße 1
58579 Schalksmühle GERMANY
Telefon: +49 2355 806-0
Telefax: +49 2355 806-204kundencenter@jung.de
www.jung.de

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References

• JUNG — Switches and systems

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