Jung RTR241 User manual

Operating instructions
Room thermostat (heating/cooling) 24 V
Art. no. RTR241
16.09.2022
82405003 J0082405003
ALBRECHT JUNG GMBH & CO. KG
Volmestraße 1
58579 Schalksmühle
GERMANY
Telefon: [phone]
Telefax: [phone]
[email protected]
www.jung.de

Table of Contents
1 Safety instructions.............................................................................................................3
2 Device components...........................................................................................................3
3 Intended use .....................................................................................................................3
4 Product characteristics......................................................................................................4
5 Functional description .......................................................................................................4
6 Operation ..........................................................................................................................5
7 Information for electrically skilled persons ........................................................................7
7.1 Commissioning ...................................................................................................... 9
8 Technical data.................................................................................................................11
9 Warranty..........................................................................................................................11
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Room thermostat (heating/cooling) 24 V

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. During installation and cable routing, comply with the regu-
lations and standards which apply for SELV circuits.
This manual is an integral part of the product, and must remain with the end cus-
tomer.
2 Device components
Image1: Device components
(1) Room temperature controller insert
(2) Cover frame
(3) Status LED
(4) Central plate
(5) Control knob
(6) Internal temperature sensor
(7) Adjustment rings temperature limit
During renovation work, the temperature sensor (6) must not become dirty or
be painted over.
3 Intended use
– Electronic room temperature controller for controlling electrothermal valve
drives for AC 24 V
– Control of the room temperature in closed rooms
– Mounting in appliance box with dimensions according to DIN 49073
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4 Product characteristics
– Manually setting a comfort temperature
– Manually switching off the temperature control
– Input terminal for activation of ECO temperature via central clock
– Input terminal for activating the cooling mode via central control
– Internal temperature sensor
– Frost protection function
– Temperature drop detection (adjusting to frost protection temperature when
window is opened)
– Controller output working method: pulse width modulation (PWM) or two-point
switchable
– Adaptation to valve type (deenergised opened or deenergised closed, switch-
able)
– Offset adjustment (correction value for measured temperature)
– Valve protection function (once a week opening and closing of valve)
– 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 24 V, the temperature is reduced by 4
°C and the status LED lights up green. This should be controlled by a central clock.
In cooling mode, the wiring of the input terminal Ø is ignored.
Cooling mode
Modern heat pump systems often also provide the option of cooling rooms. In cooling
mode, it is possible to change the cooling temperature using the control knob.
Switching between heating and cooling mode is done via the control knob or by wir-
ing the input terminal “C” with 24 V.
Temperature drop detection
In the event of a sharp drop in temperature, e.g. after opening a window, the system
regulates to the frost protection temperature of 5°C for a maximum of 30 minutes.
Pressing or turning the control knob cancels the operation.
Offset
This function allows the adjustment of the position of the control knob so that it cor-
responds to the room temperature. Thus, the indication of the temperature via the
control button is comparable in different rooms. An adaptation of up to +/- 3°C is
possible.
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Controller adaptation
Depending on the heating system, the control behaviour can be adjusted.
Pulse width modulated control (factory setting): Optimised for electrothermal valve
drives (see Technical data): The output is not permanently actuated, but for a time
period (pulse width) that depends on the difference between setpoint and actual tem-
perature. This method brings the actual temperature gradually closer to the setpoint
temperature.
Two-point control: The output remains switched on until the selected setpoint temper-
ature has been exceeded by 0.5 °C. The output will not be switched on again until
the setpoint value is undercut by 0.5 °C. Since most heating systems respond very
slowly, this type of control can entail temperature overshooting.
Setting the valve type
Depending on the electrothermal valve drive used, an adaptation to the valve type
must be made. There are valve drives where the valve is opened (deenergised
opened) or closed (deenergised closed, factory setting) when no supply voltage is
applied.
6 Operation
Brief overview
Function Control knob Status LED * LED colour
Change room tem-
perature
... turn right or
left
maximum 2
minutes
Red = heating mode
green = ECO heating mode
Blue = cooling mode
Orange = frost protection (10
seconds)
Display operating
mode
... press briefly 10 seconds. Red = heating mode
green = ECO heating mode
Blue = cooling mode
Orange = frost protection
* In permanent operation, the status LED lights up continuously during the active
heating or cooling phase, but with reduced brightness.
Increasing or reducing the room temperature
￭ Turn the control knob to the right or left.
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/cooling process (see Activate/deactivate
permanent LED operation).
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In the middle position, the device regulates to approx. 20 °C setpoint temperat-
ure. The room temperature reached depends on the installation location of the
device and the ambient conditions. The lowest setpoint temperature is
approx. 5 °C and the highest setpoint temperature is approx. 30 °C
Indication of the current operating mode
￭ Press the control knob briefly.
The LED lights up for 10 seconds in the colour of the current operating mode.
Red = heating mode, green = ECO heating mode, blue = cooling mode, or-
ange = frost protection.
Switching off the temperature control
￭ Press the control knob for longer than 2 seconds until the LED lights up or-
ange.
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 seconds.
The device switches back to the previous operating mode. The LED lights up
for 10 seconds.
Manual switching between heating and cooling mode
If 24 V is present at the input terminal C, manual switching to heating mode is not
possible.
￭ Press the control knob for longer than 4 seconds until the LED flashes red in
active heating mode, flashes green in ECO heating mode or flashes blue in
cooling mode.
￭ Briefly press the control knob again to change the operating mode.
￭ Press the control knob for longer than one second until the LED lights up con-
tinuously to accept the displayed operating mode.
After 10 seconds without actuation, the displayed operating mode is automat-
ically adopted.
Calibrating the actual and setpoint temperature
To see which rotary switch position corresponds to the current temperature, proceed
as follows.
￭ Heating mode: Turn the rotary switch slowly anticlockwise when the heating
phase is active (LED lights up red).
￭ Cooling mode: Turn the rotary switch slowly clockwise when the cooling phase
is active (LED lights up blue).
When the current temperature is reached, the LED goes out.
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Activate/deactivate permanent LED operation
The status LED lights up with reduced brightness during the active heating or cooling
phase.
￭ Press the control knob for longer than 10 seconds until the LED lights up or
flashes in the colour magenta.
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 mode.
￭ Press the control knob for more than one second or wait 10 seconds to adopt
the displayed mode.
7 Information for electrically skilled persons
Selecting a suitable installation location
– Recommended installation height: 1.50 m on interior walls
– Do not mount the device near sources of interference, such as ovens, refriger-
ators, draughts (e.g. next to the door) or direct sunlight. This affects the tem-
perature measurement of the internal temperature sensor.
– Do not mount the device within shelf walls or behind curtains and similar cov-
ers
– Do not use the device in multiple combinations with heat-generating devices
such as dimmers
DANGER!
Mortal danger of electric shock.
Disconnect the device. Cover up live parts.
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Connecting and fitting the device
Image2: Connection example of the insert
Image3: Clampable conductor cross-section
￭ Connect electrothermal valve drive (10) to insert (1) according to connection
diagram (see figure 2). Observe the conductor cross-sections (see figure 3).
￭ Optionally, connect the ECO operation input Ø via a switching contact of a
central clock (8).
If 24 V is applied to the input, the setpoint temperature is reduced by 4 °C, ex-
clusively in heating mode.
￭ Optionally, connect the cooling input C via a switching contact of the heating
system (9).
If 24 V is applied to input C, the cooling mode is active. If 24 V is switched off,
the device automatically switches to heating mode. After each switchover, the
LED lights up for 10 seconds in the colour of the current operating mode.
￭ Fit device in appliance box; terminals must be at the bottom.
￭ Fit the frame, central plate and control knob.
￭ Switch on supply voltage.
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The unit calibrates itself within the first 90 minutes. Control deviations are pos-
sible during this period.
7.1 Commissioning
Setting the control mode and valve type
Default setting:
– Pulse width modulated control (PWM)
– Valve type deenergised closed (NC)
This setting can be used with most heating systems without adaptation.
Changing the settings
￭ Press the control knob for longer than 20 seconds.
The LED flashes green for PWM control and green/blue for 2-point control.
￭ Press the control knob briefly: The control behaviour is changed.
￭ Press the control knob for longer than one second: The control behaviour is
saved.
Adapting the valve type.
The LED flashes red for valve type “deenergised closed” (NC) and red/blue for
valve type “deenergised opened” (NO).
￭ Press the control knob briefly: The valve type is changed.
￭ Press the control knob for longer than one second: The valve type is saved.
The setting mode is exited automatically.
After approx. 2 minutes without any operation the menu is exited without sav-
ing.
Setting the temperature limits
The room temperature controller has a setting range of 5 ... 30 °C. The adjustment
rings on 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 (see figure 4).
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-
ature. Each notch corresponds to a change of about 1°C.
￭ Turn the small red adjustment ring anticlockwise to the desired maximum tem-
perature.
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 axle.
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