Raychem NRG-DM Thermostat

2 DESCRIPTION

The Raychem NRG-DM thermostat is a smart electronic thermostat designed for electrical underfloor heating. It controls underfloor heating to provide optimal comfort with minimal energy consumption. The NRG-DM features an ambient sensor and a floor sensor, enabling it to monitor and control heating cables in four modes: Room sensing, Floor sensing, Room sensing with floor limiter, or No sensor mode, based on user needs.

The NRG-DM switches the electrical floor heating on and off to achieve the set temperature. When the heating is active, a symbol (?) is displayed. The thermostat operates in three primary working modes:

3 NAVIGATION PRINCIPLE

The NRG-DM features a 1.8-inch display and three control buttons. The display elements include: 1. On/OFF switch, 2. Day and time, 3. Working Mode, 4. Heating Symbol (?), 5. Displayed temperature, 6. Command area, and 7. The three control buttons.

Figure 3 shows the display with these numbered elements. The left and right buttons adjust the set temperature by 0.5°C increments (indicated by "-" and "+"), while the middle button accesses the Menu.

4 GETTING STARTED

Upon initial power-up, the NRG-DM guides the user through a setup wizard with four questions: Select Language, Confirm Time, Confirm Date, and Select Sensor.

Figure 4-7 depict these setup screens. When selecting the sensor (Figure 7), options include:

• Factory: The sensor included with the NRG-DM.
• NRG-Temp: For retrofitting an NRG-Temp or Green Leaf thermostat.
• Other: For retrofitting with different sensor types (e.g., 2kΩ, 10kΩ, 12kΩ, 15kΩ, 33kΩ). For these, users may need to input reference values at specific temperatures (15°C, 20°C, 25°C, 30°C) or use standard table settings.

This wizard appears on first installation or after a factory reset (see Section 7.3.8).

5 NAVIGATION STRUCTURE

Navigating the NRG-DM menu is straightforward for activating modes or changing settings. Figure 8 illustrates the menu structure, leading to Working Modes (Boost, Event, Constant) or Settings.

The settings are categorized into three main areas:

• Event settings: For programming the weekly schedule (see Section 7.1).
• User settings: For minor adjustments by users (see Section 7.2).
• Engineer settings: For installers or advanced users (see Section 7.3).

Figure 9 shows how to select a working mode, and Figure 10 depicts the settings categories.

6 WORKING MODES

6.1 EVENT MODE (weekly schedule mode)

The Event Mode is the energy-efficient option, utilizing a customizable weekly schedule. The schedule is based on a 7-day cycle, with each day configurable into 1 to 6 events, each defined by a duration (From – To) and a temperature.

The default pre-programmed schedule is shown in Table 2:

Users can program or adapt the weekly schedule via the Event settings (Section 7.1). The Boost Mode can be temporarily activated to step away from the weekly schedule (Section 6.3).

6.2 CONSTANT MODE (single temperature mode)

In Constant Mode, the NRG-DM maintains a single target temperature, adjustable using the +/- buttons. This mode can also be temporarily overridden by activating the Boost Mode (Section 6.3).

6.3 BOOST MODE (temporary override mode)

Boost Mode temporarily overrides the current working mode (Constant or Event). Upon expiry, the thermostat returns to the mode active before Boost Mode was initiated. Activating Boost Mode prompts the user to confirm the desired temperature and duration.

The Boost Mode is indicated by a specific icon on the screen: a flame symbol (?) when coming from Constant Mode, or a clock symbol (?) when coming from Event Mode.

To stop Boost Mode prematurely, press the 'Stop' button. Figure 11 shows the display with the Boost Icon and Stop button. Figure 12 illustrates the steps to activate Boost Mode via the menu.

7 CHANGING/CONSULTING SETTINGS

7.1 EVENT SETTINGS (programming a weekly schedule)

Event settings allow programming or modifying the weekly schedule for Event Mode. This process involves three steps:

1. Step 1: Select Day(s): Choose a specific day or a sequence of days (Mon-Fri, Sat-Sun) to program. Figure 14 shows this selection screen.
2. Step 2: Program Periods: Up to six periods can be programmed per day. This involves setting the 'From' and 'To' times for each period (Figure 15) and the target temperature (Figure 16 for Period 1, Figure 17 & 18 for Period 2).
3. Step 3: Copy Programming: Decide whether to copy the programmed schedule to the next day. This process can be repeated for other days as needed.

7.2 USER SETTINGS

7.2.1 TIME AND DATE

This setting allows adjustment of the thermostat's clock and calendar.

7.2.2 CHILD LOCK

Activating the Child Lock feature locks the thermostat settings to prevent accidental changes. A lock symbol appears on the home screen (Figure 19). To unlock, press and hold all three buttons for five seconds.

7.2.3 DISPLAY SETTINGS

Users can customize the display content:

• Time and Day: Show or hide the time and day on the home screen (Figure 20).
• Temperature: Choose to display either the desired set temperature or the actual measured temperature.
• Screen saver: Activate or deactivate the screen saver, which displays temperature, time, and day after 60 seconds of inactivity (Figure 21).

7.2.4 ENERGY MONITORING

This feature provides statistics on the NRG-DM's usage. Users need to input currency, the installed heating cable load (in kW), and the cost per unit of energy (kWh). The monitoring menu displays data for the last 2 days, the last month, and the last year.

7.3 ENGINEER SETTINGS

7.3.1 TEMPERATURE CALIBRATION

For Floor Sensor Mode: Calibrate the floor sensor to match the actual floor temperature, accounting for differences due to floor construction.

For Room Sensor Mode: Calibrate the ambient sensor to match the actual room temperature. The NRG-DM performs auto-calibration for the Room Sensor after factory resets or initial installation. Manual calibration is recommended only in specific cases where auto-calibration accuracy is suboptimal.

7.3.2 ADAPTIVE FUNCTION

The Adaptive Function helps the NRG-DM learn when to activate heating to reach the desired temperature at the scheduled time. It operates in Event Mode and is factory-activated, but can be deactivated. This function optimizes energy consumption for user comfort.

7.3.3 SENSOR SETTING

This setting configures the thermostat based on the installed sensor type:

• When a floor sensor is installed:
  • Floor: Regulates temperature based on the floor sensor input.
  • Room/limit: Regulates based on room sensor input but prevents the floor temperature from exceeding a set limit measured by the floor sensor.
• When no external sensor is installed:
  • Room: Regulates based on the room sensor input.
  • No sensor: Operates as a regulator using duty cycles to control heating cables.

7.3.4 TEMPERATURE SCALE

Allows setting the minimum and maximum settable temperatures for all working modes (Event, Constant, Boost).

7.3.5 BACKLIGHT

Defines the behavior of the blue backlight:

• Auto: Deactivates after 30 seconds of inactivity.
• On heat: Lights up when the thermostat is actively heating.
• Constant On: The backlight remains on continuously.

7.3.6 SENSOR

Selects the type of installed sensor:

• Factory: Sensor delivered with the NRG-DM (12kΩ).
• NRG-Temp: Sensor for NRG-Temp or Green Leaf thermostats (10kΩ).
• Other sensor types: 2kΩ, 10kΩ, 12kΩ, 15kΩ, 33kΩ. For these, reference points may be required for calibration.

7.3.7 LANGUAGE

The NRG-DM supports 11 languages for its firmware: Czech, Dutch, English, Finnish, French, German, Lithuanian, Norwegian, Polish, Russian, and Swedish. Users can select their preferred language in this menu.

7.3.8 FACTORY RESET

This function resets all settings to their original factory defaults.

7.3.9 INFORMATION

Provides information on contacting support, measured temperatures, calibration status, and the thermostat's software version.

8 TROUBLE SHOOTING

In case of sensor damage or malfunction, the heating output is disabled (fail-safe), and an error code is displayed. Table 3 lists common error codes:

* Note: If replacing the floor sensor, use product reference 1244-002952 and select the NRG-Temp sensor in the settings (Section 7.3.6).

9 TECHNICAL SPECIFICATION

* According to the EN 60730-1 table 1

10 APPROVALS AND DECLARATIONS

The NRG-DM thermostat complies with relevant safety and performance standards, indicated by certifications such as CE, DVE, and EAC.