nVent RAYCHEM NRG-DM Smart Thermostat

Product Overview

The NRG-DM is a smart electronic thermostat designed for electric floor heating systems. It offers precise temperature control to ensure optimal comfort while minimizing energy consumption. The thermostat features a built-in room sensor and can also utilize an external floor sensor for advanced regulation.

It supports multiple operating modes, including Constant Mode for a single set temperature, Event Mode for programmed weekly schedules, and Booster Mode for temporary temperature overrides.

Technical Drawings and Dimensions

The NRG-DM thermostat has a compact design:

• Front Dimensions: 82 mm x 82 mm
• Depth: 20 mm
• Back/Mounting Dimensions: 74 mm x 74 mm

Figure 1: Shows the front and side views of the NRG-DM thermostat, highlighting its display, control buttons, and mounting points.

Figure 2: Illustrates the process of detaching the front cover using a screwdriver, typically for installation or access.

Safety Information

OBS! (Warning): This product may be used by children aged 8 years and above, and by persons with reduced physical, sensory, or mental capabilities, or lack of experience and knowledge, provided they are supervised or have received instructions on safe product use and understand the associated risks. Children must not play with the product. User cleaning and maintenance must not be performed by children without supervision.

Product Description

The NRG-DM thermostat is an intelligent electronic device for electric floor heating. It regulates your floor heating to provide maximum comfort with minimal energy usage. The NRG-DM is equipped with an integrated room sensor and a floor sensor to monitor and control your floor heating across four regulation modes: floor sensor only, room sensor only, room sensor with floor limitation, or as a regulator. The thermostat switches the electric floor heating on and off to achieve the set temperature. When the electric floor heating is active, a "heating-on indicator" is displayed.

The NRG-DM controls electric floor heating in three operating modes:

Table 1: Summary of Operating Modes.

Navigation Principle

The NRG-DM features a large and clear 1.8-inch display. Navigation is intuitive using the three physical buttons.

Key Display Elements:

1. ON/OFF Switch
2. Date and Time
3. Operating Mode
4. Heating Symbol
5. Temperature Display
6. Command prompts
7. Physical Buttons

Figure 3: Illustrates the thermostat display with numbered elements corresponding to the controls.

Button Functions:

• The left and right buttons display "-" and "+" respectively. These are used to adjust the set temperature in 0.5°C increments.
• The middle button displays "Menu". This button is used to access the thermostat's menus.

Getting Started

Upon the first power-up, the NRG-DM guides you through a 4-step initial setup:

1. Select Language: Choose your preferred language from a list (e.g., English, Norwegian).
2. Confirm Time: Set the current time.
3. Confirm Date: Set the current date.
4. Select Sensor: Choose the type of temperature sensor to be used.

Figure 4, 5, 6, 7: Show the initial setup screens for language, time, date, and sensor selection.

Note: This setup guide appears only on the first installation or after a factory reset (refer to Section 7.3.8 Factory Reset).

Sensor Selection Options (refer to Figure 7):

• Factory: Use the sensor supplied with the NRG-DM.
• NRG-Temp: For use with an existing T2NRG-Temp floor sensor.
• Other: For use with other compatible sensors, such as 2kΩ, 10kΩ, 12kΩ, 15kΩ, and 33kΩ sensors. If you have the sensor's reference values table, use it to set the correct reference values at 15°C, 20°C, 25°C, and 30°C. Otherwise, use the default settings by confirming the values with the OK button.

Navigation Structure

The NRG-DM offers an intuitive menu system for activating operating modes or changing settings.

Figure 9: Illustrates the menu flow, showing how to access Operating Modes (Booster, Event, Constant) or Settings from the main menu.

Figure 10: Shows the structure of the settings menu, categorizing them into Engineer settings, User settings, and Event settings.

Settings are divided into three categories:

• Event Settings: Used to program the weekly schedule (refer to Section 7.1 Set Event).
• User Settings: Allows the user to make simple adjustments (refer to Section 7.2 User Settings).
• Engineer Settings: For advanced configurations by installers or experienced users (refer to Section 7.3 Engineer Settings).

Operating Modes

6.1 Event Mode (Weekly Schedule)

Event Mode is an energy-saving mode where a pre-set weekly schedule can be easily customized to your needs. The weekly schedule is based on a 7-day pattern, with each day definable by 1 to 6 periods/events. Each event is a combination of a duration (From – To) and a temperature.

The pre-programmed weekly schedule is as follows:

Table 2: Pre-programmed weekly schedule.

Note: You can temporarily override the weekly schedule by activating Booster Mode (refer to Section 6.3 Booster Mode).

6.2 Constant Mode (Single Temperature)

Constant Mode is a simple operating mode where the NRG-DM focuses solely on a set temperature. In this mode, you can adjust the temperature using the "+" and "-" buttons.

Note: You can temporarily override Constant Mode by activating Booster Mode (refer to Section 6.3 Booster Mode).

Booster Mode (Temporary Override)

Booster Mode temporarily overrides the currently set operating mode (Event Mode or Constant Mode). Once the Booster Mode duration ends, the thermostat resumes operation in the mode that was active before Booster Mode was activated.

When activating Booster Mode, the NRG-DM prompts you to confirm the desired temperature and duration.

Booster Mode is identified on the display by the following symbols:

• When coming from Constant Mode: [Constant Mode indicator]
• When coming from Event Mode: [Event/Booster Mode indicator]

If you wish to end Booster Mode earlier than the set duration, press the "Stop" button.

Figure 11: Shows the display with the "Stop" button.

Figure 12: Illustrates the menu navigation to activate Booster Mode: press "Menu", navigate to Booster Mode, and then press "Select".

Note: If using Event Mode, Booster Mode can be activated by directly pressing the "+" or "-" buttons.

Changing/Viewing Settings

7.1 Set Event (Program Weekly Schedule)

Event settings are used to program or customize the weekly schedule. Programming the weekly schedule involves 3 steps:

1. Step 1: Select Day(s): Choose a day or a sequence of days to program (e.g., Mon-Fri, Sat-Sun).

Figure 14: Shows the screen for selecting days.

2. Step 2: Program Periods: Program up to 6 periods for the selected day(s).
• Period 1: Set duration (From 00:00 to 07:00) and temperature (e.g., 16.0°C).

Figure 15: Shows setting the 'From' time for Period 1.

Figure 16: Shows setting the temperature for Period 1.

• Period 2: Set duration (From 07:00 to 09:00) and temperature (e.g., 23.0°C).

Figure 17: Shows setting the 'To' time for Period 2.

Figure 18: Shows setting the temperature for Period 2.

• Periods 3-6: Program remaining periods or until 24:00.
3. Step 3: Copy Schedule: Decide whether to copy this schedule to the next day.

You can repeat steps 1 to 3 for other days as needed.

7.2 User Settings

7.2.1 Time and Date

The Time and Date setting allows you to set the clock and calendar.

7.2.2 Child Lock

When the child lock is activated, a "child-lock indicator" is displayed. This prevents accidental changes to the thermostat's settings. To unlock the NRG-DM, press and hold all three buttons for 5 seconds.

Figure 19: Shows the display with the child lock symbol.

7.2.3 Display Settings

Display settings allow you to customize what is shown on the display:

• Time and Date: Show or hide the time and date on the home screen.

Figure 20: Illustrates showing/hiding time and date, and the ON/OFF toggle for this feature.

• Temperature: Display the desired setpoint temperature or the actual measured temperature.
• Screen Saver: Activate or deactivate the screen saver. The screen saver displays temperature, time, and date when the thermostat has been inactive for 60 seconds.
• Screen Mode: The display can be shown in standard or inverted mode.

Figure 21 & 22: Illustrate display options including screen saver and screen modes (Standard/Inverted).

7.2.4 Energy Monitoring

You can view usage statistics for the NRG-DM. To do this, you must first set the currency, load (electrical load in kW), and energy cost per kWh in the Energy Monitoring menu.

The Energy Monitoring menu displays calculated values for the last 2 days, the last month, and the last year.

Engineer Settings

7.3.1 Temperature Calibration

When using a Floor Sensor (refer to Section 7.3.3 Regulation Mode):

You can calibrate the floor sensor to the actual floor temperature using the Calibration menu. The floor's actual temperature may differ from the temperature measured by the sensor due to the floor's construction.

When using a Room Sensor (refer to Section 7.3.3 Regulation Mode):

You can calibrate the room sensor to the actual room temperature using the Calibration menu.

The NRG-DM performs an automatic calibration of the room sensor after each factory reset (or after the initial installation). Manual calibration of the room sensor should only be performed after this automatic calibration, and only if the automatic calibration does not seem 100% accurate.

7.3.2 Adaptive Function

Thanks to the adaptive function, the NRG-DM learns when to switch on the heating to achieve the desired temperature at the desired time. The adaptive function is only active in Event Mode and is enabled by default in the factory settings. You can disable the Adaptive Function in the Adaptive Function menu. The adaptive function optimizes energy consumption to provide the user with desired comfort.

7.3.3 Regulation Mode

The NRG-DM can operate with various sensor configurations. Some settings are activated in the thermostat when a physical floor sensor is installed. Other settings are activated when no external sensor is installed.

• When a floor sensor is installed and connected:
  • Floor Sensor Regulation: The NRG-DM regulates the temperature based on the input signal from the floor sensor (placed in the floor).
  • Room Sensor with Floor Limitation: The NRG-DM regulates the temperature based on the input signal from the room sensor (built into the thermostat), but ensures the floor does not exceed the desired temperature, as measured by the floor sensor.
• When no external sensor is installed or connected:
  • Room Sensor Regulation: The NRG-DM regulates the temperature based on the input signal from the room sensor (built into the thermostat).
  • Regulator: The thermostat functions as a regulator. It operates with specific switching times, and the floor heating is activated for a percentage of the switching time.

7.3.4 Temperature Scale

The Temperature Scale settings allow you to limit the adjustable minimum and maximum temperatures in the operating modes (Event Mode, Constant Mode, or Booster Mode).

7.3.5 Lighting

You can select the backlight (blue light) for the NRG-DM as follows. There are three possible settings:

• Auto: The backlight deactivates 30 seconds after the last activity.
• Heat: The backlight turns on every time the thermostat calls for heat.
• Continuous: The backlight is always on.

7.3.6 Sensor

For the Sensor setting, you select the type of floor sensor that has been installed. Possible choices for floor sensors are:

• Factory: The floor sensor supplied with the NRG-DM (12kΩ sensor).
• NRG-Temp: Floor sensor for NRG-Temp or Green Leaf thermostat (10kΩ sensor).
• 2 kΩ sensor
• 10 kΩ sensor
• 12 kΩ sensor
• 15 kΩ sensor
• 33 kΩ sensor

With the exception of the Factory and NRG-Temp sensors, you must enter the reference value for the sensor at 15°C, 20°C, 25°C, and 30°C. If you do not have these reference values for the sensor, the NRG-DM suggests a standard calibration for the sensor. This may not be 100% accurate but will be close to the actual values.

Language, Reset, Information, and Troubleshooting

7.3.7 Language

The NRG-DM supports 12 language settings. You can select the following languages for the firmware:

Czech, Danish, Dutch, English, Finnish, French, German, Lithuanian, Norwegian, Polish, Russian, or Swedish.

7.3.8 Factory Reset

This function returns all settings to their factory default values.

7.3.9 Information

In the information section of the thermostat, you can find details on how to contact nVent, measurement values for temperature and calibration, and the software version.

8 Troubleshooting

If any of the temperature sensors are damaged or stop functioning, the heating will be turned off (fail-safe function), and an error code will be displayed.

Table 3: Error codes and their meanings.

* The floor sensor can be replaced with a new one (product reference = 1244-002952). When replacing the floor sensor, you must select the NRG-Temp sensor in the sensor list (refer to Section 7.3.6 Sensor).

9 Technical Data

* According to EN 60730-1 Table 1

Table 4: Technical specifications summary.

10 Approvals and Declarations

The NRG-DM thermostat complies with relevant standards, indicated by the CE marking.