GCRTR23 - Thermostats JUNG - Free user manual and instructions

Product Type	Room temperature controller
Model Variants	TR 231 U (230 V~), TR 241 U (24 V~), TR 236 U (230 V~), TR 246 U (24 V~)
Switching Principle	TR 231 U / TR 241 U: 1-pole break contact with ON/OFF switch; TR 236 U / TR 246 U: 1-pole changeover contact without switch
Temperature Range	5 °C to 30 °C (adjustable, can be limited via setting knob)
Temperature Differential	Approx. 0.5 K
Temperature Reduction	Approx. 4 K (models with separate terminal: TR 231 U and TR 241 U)
Power Supply	AC 230 V~ (TR 231 U, TR 236 U) or AC 24 V~ (TR 241 U, TR 246 U)
Nominal Current	TR 231 U / TR 241 U: 10 A (4 A inductive); TR 236 U / TR 246 U: Heating 10 A (4 A inductive), Cooling 5 A (2 A inductive)
Connection	Neutral conductor required; conductor cross-section 1 to 2.5 mm² solid
Mounting	In switch box according to DIN 49073; mounting height approx. 1.5 m above floor
Ambient Conditions	Relative air humidity max. 95%; avoid condensation
Accessories Included	Insert (depending on variant), setting knob, rocker, center plate, frame
Spare Parts	Inserts and covers available separately (e.g., TR 231 PL, TR 241 PL, TR 236 PL, TR 246 PL); special knob MS TR 231
Maintenance	Clean with a dry cloth; do not use solvents or abrasive cleaners
Warranty	Per legal framework through the specialty store

Frequently Asked Questions - GCRTR23 JUNG

What is the purpose of the JUNG GCRTR23 thermostat?

The JUNG GCRTR23 is a room temperature controller used to regulate temperature in closed rooms such as flats, schools, function suites, and workshops.

Which models are included in the GCRTR23 series?

The series includes TR 231 U (230 V~), TR 241 U (24 V~), TR 236 U (230 V~), and TR 246 U (24 V~). Variants differ in voltage and switching features.

How do I restrict the temperature setting range?

Remove the setting knob, turn the red (max) and blue (min) adjustment rings using a pen tip, then reattach the knob. The pointer must be roughly in the centre of the new range.

What is the temperature reduction feature?

Models TR 231 U and TR 241 U have a separate terminal for a temperature reduction of approx. 4 K (e.g., for nighttime lowering). The reduction is activated by an external clock signal.

Can I use this thermostat with a cooling system?

Yes, models TR 236 U and TR 246 U support cooling (changeover contact). For cooling, the nominal current is 5 A (2 A inductive).

What should I consider during installation?

Mount on an internal wall opposite heat sources, avoid external walls and draughts, ensure free air circulation. The neutral conductor must be connected. Disconnect power before installation.

How do I clean the thermostat?

Use a dry cloth. Do not use solvents, abrasive cleaners, or immerse in water. Avoid moisture ingress.

What is the warranty period?

The warranty follows the legal framework as provided by law, through the specialty store where purchased.

What spare parts are available?

Spare parts include inserts (e.g., TR 231 U, TR 241 U), covers (e.g., TR 231 PL), and a special knob (MS TR 231). Check with your supplier for exact compatibility.

What does the status LED indicate?

On models with an ON/OFF switch (TR 231 U and TR 241 U), the LED indicates when the set temperature is reached and the contact opens.

USER MANUAL GCRTR23 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

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

Fig. 2: TR 231 U

Fig. 3: TR 241 U

Fig. 4: TR 236 U

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.

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^irc C (max. scale).

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^irc C (min. scale).

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.