TRA241 - Thermostat JUNG - Free user manual and instructions

Product Type	Thermostat
Brand	JUNG
Model	TRA241
Power Supply	2x AA batteries (1.5V)
Dimensions (HxWxD)	80 x 80 x 30 mm
Weight	150 g
Display Type	LCD with backlight
Temperature Range	5°C to 35°C
Accuracy	±0.5°C
Programming	7-day programmable
Modes	Comfort, Economy, Frost Protection
Compatibility	Most heating systems (gas, electric, heat pump)
Control Type	Push buttons and rotary dial
Mounting	Wall-mounted (flush or surface)
Wiring	3-wire (L, N, output) or 2-wire (battery)
Maintenance	Clean with a soft, dry cloth; avoid liquids
Safety	CE certified, low voltage
Spare Parts	Batteries only (user-replaceable)
Repairability	Not user-serviceable; contact professional

Frequently Asked Questions - TRA241 JUNG

How do I install the TRA241 thermostat?

Install the thermostat by first turning off power to your heating system. Mount the backplate on the wall using the provided screws, connect the wires according to the diagram (L, N, and output for 3-wire systems, or simply insert batteries for 2-wire battery operation), then snap the thermostat onto the backplate.

How do I set the time and date?

Press and hold the Menu button for 3 seconds. Use the rotary dial to set the year, month, day, hour, and minute. Confirm each setting by pressing the dial.

How do I program the weekly schedule?

Press Menu and select Schedule. Choose a day, then set time periods (e.g., Comfort and Economy) using the dial. You can copy schedules to other days.

Why is my thermostat not responding?

Check if the batteries are depleted (replace with new AA batteries). Ensure the device is correctly seated on the backplate. If using wired power, check the circuit breaker.

What do the symbols on the display mean?

Common symbols include: Sun (Comfort mode), Moon (Economy mode), Snowflake (Frost protection), Battery (low battery), and Flame (heating active).

Can I use the TRA241 with a heat pump?

Yes, the TRA241 is compatible with most heat pumps. Ensure the output type is set to heat pump in the advanced settings menu (press Menu and hold for 5 seconds).

How do I reset the thermostat to factory defaults?

Go to Menu > Settings > Factory Reset. Confirm by pressing Yes. All programmed schedules will be erased.

What type of batteries does the TRA241 use?

It uses two AA 1.5V alkaline batteries. Do not use rechargeable batteries as they may have lower voltage.

How do I lock the thermostat to prevent tampering?

Press and hold the Up and Down buttons simultaneously for 5 seconds. A lock icon will appear on the display. Repeat to unlock.

What is the temperature accuracy of the TRA241?

The thermostat has a temperature accuracy of ±0.5°C at room temperature, ensuring precise comfort control.

USER MANUAL TRA241 JUNG

Room temperature controller

GB

Ref.-no.: TR .. 231 ..

TR .. 241 ..

TR .. 236 ..

TR .. 246 ..

Operating instructions

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 devise or load.

A relative air humidity of max. 95% may not be exceeded. Avoid any moisture condensation.

These instructions are an integral part of the product, and must remain with the end customer.

2 Structure of the device

Exploded view diagram of an electrical switchgear with numbered parts and labeled components

The room temperature controller is used to regulate the temperature in closed rooms such as flats, schools, function suites, workshops, etc.

Product characteristics

Neutral conductor required

TR 231 U / TR 241 U:

• Separate terminal for temperature reduction of 5 K (e.g. during night time)
• ON/OFF switch with status LED

- When set temperature is reached the contact opens up.

TR 236 U / TR 246 U:

• No OFF-position
• Without switch and control LED
• When set temperature is reached the NO/NC contact switches over.

4 Information for electrically skilled persons

Installation and electrical connection

DANGER

Electric shock from touching live parts in the installation environment.

An electric shock can be fatal.

Before working on the device, disconnect the power and cover live parts in the area.

• Mount the room temperature controller on an internal wall opposite the heat source if possible.
• Do not mount the room temperature controller on outside walls.
• Avoid draughts from windows and doors.
• Ensure that the normal air circulation in the room reaches the controller without any obstacles.
• External heat sources influence the accuracy of the controller. Avoid direct sunlight and do not place heat-emitting devices in the vicinity of the room temperature controller (heaters, lamps, etc.).
• Dimmers also generate heat.
  If a controller is installed in a common switch frame with a dimmer, the distance between them should be as great as possible. When arranging them vertically, the controller must be installed underneath the dimmer.

Connection

10(4)A EAC WWJJ JUNG TR231U 0231026100 AC230V~ L N L T TA <θ RF N

Fig. 2: TR 231 U

AC1 AC2 AC1 TA AC2 24V~ 10(4)A WWJJ JUNG TR241U 0231026200

Fig. 3: TR 241 U

10(4)A 5(2)A EAC WWJJ JUNG TR236U 0231028300 AC230V~ L N L N <θ RF

Fig. 4: TR 236 U

AC1 AC2 AC1 AC2 10(4)A 5(2)A WWJJ EAC 30° JUNG TR246U 24V~ 8246026100 AC1 <θ RF

Fig. 5: TR 246 U

- Carry out the electrical connection according to the respective wiring diagram.

i Ensure that the neutral conductor N is connected to terminal N. Considerable fluctuations in temperature may otherwise occur.

Conductor cross-section: 1 to 2.5 mm² solid conductor

Symbols used in the wiring diagram

L = L conductor

N = N-conductor

AC1 = 24 V power supply

AC2

① = Connection for clock signal to reduce temperature

= Heating

※ = Cooling

RF = Resistor for thermal feedback

TA = Resistor for night reduction of room temperature

Installation

- Mount room temperature controller in a switch box in accordance with DIN 49073.

Mounting height: approx. 1.5 m above the floor

- Clip the rocker (4) on the switch in the flush insert. (fig. 1)

- Place the center plate together with the frame on the flush insert. The center plate must snap in place in the top left of the housing base.

• Tighten the screw (5). (fig. 1)

- Clip on the setting knob (6). (fig. 1)

5 Operation

Restricting the temperature setting range

The temperature controller is set ex works to the maximum setting range of 5 °C to 30 °C.

30°C 5°C

Fig. 6: Temperature setting range

Two adjustment rings are located in the setting knob. You can use these rings to restrict the temperature setting range required e.g. between 8 °C and 23 °C.

Procedure:

- Select the temperature limits.

Example: min 8 °C, max. 23 °C

- Important!

First position the setting knob roughly in the centre of the required setting range.

Example: The centre point between 8 °C and 23 °C is approximately 15 °C.

- Now remove the setting knob.

- Set the red locating ring to the max. temperature limit.

Example: 23 °C

- Rotate anti-clockwise.

The numbers on the outer dial apply!

- Insert the tip of a pen in the hole and turn the red ring to the left until it reaches 23^ (max. scale).

23°C min. 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23

Fig. 7: Temperature setting range max.

- Set the blue locating ring to the min. temperature limit.

Example: 8 °C

- Rotate clockwise.

The numbers on the inner dial apply.

- Insert the tip of a pen in the hole and turn the blue ring to the right until it reaches 8^ C (min. scale).

min 8°C 0.2 0.5 1.0 1.5 2.0 3.0 4.0 5.0 6.0 7.0 8.0

Fig. 8: Temperature setting range min.

- Clip on the setting knob.

The pointer must be roughly in the centre of the new setting range.

Example: approx. 15 °C

Scale for setting the temperature with dials

1 = approx. 5 °C

2 = approx. 10 °C

3 = approx. 15 °C

4 = approx. 20 °C

5 = approx. 25 °C

6 = approx. 30 °C

Symbols

O Off

I On

6 Technical data

TR 231 U / TR 241 U:

Switching principle 1-pole break contact

+ on/off switch

Temperature range 5 ... 30 °C

Nominal voltage

TR 231 U AC 230 V \~

TR 241 U AC 24 V \~

Nominal current* 10 (4) A

Differential of

functioning temperature approx. 0.5 K

Temperature reduction approx. 4 K

Energy class I = 1 %

The value in brackets indicates the inductive load at a cos φ of 0.6.

TR 236 U / TR 246 U:

Switching principle 1-pole change over contact

without switch

Temperature range 5 ... 30 °C

Nominal voltage

TR 236 U AC 230 V \~

TR 246 U AC 24 V \~

Nominal current*

Heating 10 (4) A

Cooling 5 (2) A

Differential of

functioning temperature approx. 0.5 K

* The value in brackets indicates the inductive load at a cos φ of 0.6.

7 Accessories

Inserts

TR 231 U

TR 241 U

TR 236 U

TR 246 U

Covers

.. TR 231 PL ..

.. TR 241 PL ..

.. TR 236 PL ..

.. TR 246 PL ..

Special knob

MS TR 231 ..

8 Warranty

The warranty follows about the specialty store in between the legal framework as provided for by law.