Jung RTR231 - User Manual

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Overview

Function Description
Important Technical Specifications
Usage Features
Maintenance Features

This document describes the JUNG Room Thermostat (heating/cooling) 230 V, Art. no.: RTR231, an electronic room temperature controller designed for managing electrothermal valve drives in closed rooms. It is intended for mounting in appliance boxes conforming to DIN 49073.

Function Description

The room thermostat offers a range of functionalities for precise temperature control:

ECO Operation: This feature allows the temperature to be set to a lower ECO temperature at specific times, rather than maintaining a constant comfort temperature. By connecting the input terminal to 230 V, the temperature is reduced by 4 °C, and the status LED illuminates green. This function is typically controlled by a central clock. In cooling mode, the wiring of the input terminal is ignored.

Cooling Mode: The device supports cooling functionality, often used with modern heat pump systems. The cooling temperature can be adjusted using the control knob. Switching between heating and cooling modes is achieved either via the control knob or by wiring the input terminal "C" with 230 V.

Temperature Drop Detection: In instances of a rapid temperature drop, such as when a window is opened, the system automatically regulates to a frost protection temperature of 5 °C for a maximum of 30 minutes. This operation can be canceled by pressing or turning the control knob.

Offset Adjustment: This function enables the adjustment of the control knob's position to align with the actual room temperature. This ensures consistent temperature indications across different rooms. An adaptation of up to +/- 3 °C is possible.

Controller Adaptation: The control behavior can be adjusted based on the specific heating system.

Pulse Width Modulated (PWM) Control (Factory Setting): Optimized for electrothermal valve drives, this method does not permanently actuate the output. Instead, it actuates for a time period (pulse width) that varies depending on the difference between the setpoint and actual temperature, gradually bringing the actual temperature closer to the setpoint.
Two-Point Control: The output remains switched on until the selected setpoint temperature is exceeded by 0.5 °C. It will not switch on again until the setpoint value is undercut by 0.5 °C. Due to the slow response of most heating systems, this control type can lead to temperature overshooting.

Setting the Valve Type: The device can be adapted to the specific electrothermal valve drive used. Options include "deenergised opened" (NO) or "deenergised closed" (NC), with "deenergised closed" being the factory setting.

Frost Protection Function: Prevents the room temperature from falling below 5 °C.

Silent Switching: Ensures quiet operation of the device.

Valve Protection Function: Automatically opens and closes the valve once a week to prevent seizing.

Permanent LED Operation: The status LED can be set to operate continuously with reduced brightness during active heating or cooling phases.

Important Technical Specifications

Rated Voltage: AC 230 V~
Mains Frequency: 50/60 Hz
Standby Power: max. 0.5 W
Connected Load: 20 W
Connection: Thermal valve drive 230 V, art. no. TSA230NCWW
Number of Valve Drives: 1 ... 10
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%

Usage Features

Increasing or Reducing Room Temperature: Turn the control knob right or left. If the setpoint temperature is not reached, the LED illuminates for up to 2 minutes in the color of the current operating mode. This indication can also be set to occur during the entire heating/cooling process. The middle position regulates to approximately 20 °C. The lowest setpoint is 5 °C, and the highest is 30 °C.

Indication of Current Operating Mode: Briefly press the control knob. The LED will illuminate for 10 seconds in the color corresponding to the current operating mode:

Red = heating mode
Green = ECO heating mode
Blue = cooling mode
Orange = frost protection

Switching Off Temperature Control: Press the control knob for more than 2 seconds until the LED illuminates orange. The device enters frost protection mode (5 °C). Turning the control knob will cause the LED to flash orange for 10 seconds. To reactivate temperature control, press the control knob again for more than two seconds; the device will return to the previous operating mode.

Manual Switching Between Heating and Cooling Mode:

If 230 V is present at 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 for active heating, green for ECO heating, blue for cooling).
Briefly press the control knob again to cycle through operating modes.
Press the control knob for longer than one second to accept the displayed mode, or wait 10 seconds for automatic adoption.

Calibrating Actual and Setpoint Temperature:

Heating Mode: Slowly turn the rotary switch anticlockwise until the LED (red) goes out, indicating the current temperature is reached.
Cooling Mode: Slowly turn the rotary switch clockwise until the LED (blue) goes out.

Activating/Deactivating Permanent LED Operation: Press the control knob for longer than 10 seconds until the LED illuminates or flashes magenta.

Solid magenta = permanent operation active.
Flashing magenta = permanent operation inactive (default).
Briefly press the control knob to switch modes.
Press for more than one second or wait 10 seconds to adopt the displayed mode.

Setting Temperature Limits: The adjustment rings on the central plate allow limiting the temperature setting range (e.g., from 5-30 °C to 10-25 °C). To do this, pull off the control knob to reveal the adjustment rings. Turn the large blue ring clockwise for the minimum temperature and the small red ring anticlockwise for the maximum temperature. Each notch corresponds to approximately 1 °C.

Setting the Offset: This function allows adjusting the control knob's position to match the actual room temperature, ensuring consistent temperature readings across different rooms (up to +/- 3 °C). This is only possible if the lower temperature limit has not been raised by the blue setting ring.

With the desired setpoint temperature reached, turn the control knob to 5 °C (left stop) and double-click. The LED will flash quickly, alternating red and green.
Turn the control knob to the desired position for the current room temperature and press it for longer than one second. The position is saved, and the LED lights up green for 5 seconds.
If the LED flashes red for 5 seconds, the change was greater than +/- 3 °C and is discarded.

Maintenance Features

Installation Location:

Recommended installation height: 1.50 m on interior walls.
Avoid mounting near interference sources like ovens, refrigerators, draughts, or direct sunlight, as these can affect the internal temperature sensor's measurement.
Do not mount within shelf walls or behind curtains/covers.
Do not use in combination with heat-generating devices like dimmers.

Commissioning: The unit calibrates itself within the first 90 minutes after switching on mains voltage. Control deviations may occur during this period.

Safety: Electrical devices must only be mounted and connected by electrically skilled persons. Always disconnect power before working on the device or load to prevent electric shock. The manual is an integral part of the product and must remain with the end customer. During renovation, the temperature sensor (6) must not become dirty or painted over.