SALUS RT520 Series Smart Thermostats

Introduction

The RT520 and RT520RF thermostats are the latest SALUS products, carefully designed and tested. Thanks to new auto-adaptive functions (TPI or OpenTherm), these thermostats offer the most efficient solution for reducing heating costs, being fully compliant with the latest industry standards (e.g., UK's "Boiler Plus"). They provide homeowners with optimal and efficient heating control, ensuring maximum comfort. Available in both wired and wireless versions, the new RT520 series includes all the features of the previous RT series, enhanced with a larger, more intuitive LCD screen and numerous other efficiency-focused functions. Please read this installation guide carefully before use.

Product Conformity

This product complies with the following European directives: EMC 2014/30/EU, LVD 2014/35/EU, RED 2014/53/EU and RoHS 2011/65/EU. The full text of the EU Declaration of Conformity is available at the following internet address: www.saluslegal.com

Safety Information

Use in accordance with European and national regulations. For indoor use only. Keep the product perfectly dry. This product requires installation by a competent person in compliance with national and European regulations. Disconnect the appliance from the electrical power supply before installation or any other modification (including battery replacement). For the thermostat, use only 1.5V AA alkaline batteries. Place batteries in the battery compartment on the back of the thermostat. Do not use rechargeable batteries.

Technical Specifications

Button Functions

• [MENU]: Access options; press and hold for 3 seconds to return to the main screen or deactivate Boost Mode.
• [SELECT]: Confirm changes and enter menus.
• [DOWN ARROW]: Decrease temperature and navigate menus.
• [UP ARROW]: Increase temperature and navigate menus.
• [TEMPORARY MANUAL BOOST]: Activate "BOOST" mode.
• [MANUAL]: Activate Manual mode; press and hold for 3 seconds to deactivate.
• [ON]: In Manual mode, turns the boiler ON.
• [OFF]: In Manual mode, turns the boiler OFF.
• [AUTO]: Receiver operates in automatic mode according to the thermostat.
• [MANUAL]: Control of the connected equipment (ON/OFF) is managed by the slider button.

LCD Icons

• 1. Text Bar
• 2. Temperature Unit (°C)
• 3A. Day of the Week (Numeric)
• 3B. Day of the Week (Alphabetic) (MON, TUE, WED, THU, FRI, SAT, SUN)
• 4. Clock
• 5. AM/PM
• 6. Cooling Mode On
• 7. Vacation Mode On
• 8. Manual Mode On
• 9. Heating Mode On
• 10. Low Battery Indicator
• 11. Wireless Connection with Receiver
• 12. Service Mode On
• 13. Measured / Set Temperature
• 14. Program Number
• 15. Settings
• 16. Program Indicator

Wiring Diagrams

RT520TX Thermostat Wiring Diagram: This schematic illustrates the connections for the RT520TX thermostat, the RXRT520 receiver, and AC 230V mains power. Terminals on the receiver include N (Neutral), COM (Common), NO (Normally Open), NC (Normally Closed), and OpenTherm (B/A) for communication.

RT520 Thermostat Wiring Diagram: This diagram shows the RT520 thermostat's connection to OpenTherm terminals (B/A) and the receiver's connection to mains power (L, N).

RXRT520 Receiver Terminal Description: Details the terminal connections on the RXRT520 receiver, including OpenTherm (B/A), potential-free output terminals (NO, NC, COM), and AC 230V power supply (L, N).

OpenTherm Activation and Configuration

OpenTherm is a modulation control method used by modern heating systems. It allows the boiler's heat output to be adjusted to match the thermostat's demand, offering increased efficiency, energy savings, and comfort.

Steps:

1. Connect and power the receiver before inserting batteries into the thermostat.
2. Insert batteries (2x AA alkaline) into the thermostat.
3. Upon inserting batteries, the thermostat powers on. Press [SELECT] to activate.
4. Select language using [UP ARROW] or [DOWN ARROW] and press [SELECT]. (e.g., ROMANA)
5. Press [MENU].
6. Select language using [UP ARROW] or [DOWN ARROW] and press [SELECT].
7. Press [SELECT] to activate automatic summer/winter time switching.
8. If the thermostat does not have an active OpenTherm connection, consult the Standard Start-up and Configuration section.
9. Use [UP ARROW] or [DOWN ARROW] to set the temperature display precision and press [SELECT].
10. Press [SELECT] to confirm.
11. Navigate to the Hot Water submenu using [UP ARROW] or [DOWN ARROW] and adjust the temperature, then press [SELECT].
12. The thermostat will return to the main screen. Press any button.
13. The text bar indicates that the hot water function is ON.

OpenTherm - Hot Water: Adjust hot water temperature settings. The device software will automatically adjust settings when OpenTherm terminals are connected.

Standard Start-up and Configuration (without OpenTherm connection)

Follow steps 1 to 16 from the OpenTherm Activation and Configuration section. NOTE: Use [UP ARROW] or [DOWN ARROW] to choose either TPI Mode or Hysteresis Mode. Choosing one option excludes the other.

TPI Mode (Time Proportional & Integral): This mode activates an advanced algorithm that maintains room temperature as close as possible to the user's desired value. By reducing room overheating, TPI can lead to energy savings and increased comfort. The algorithm continuously evaluates temperature fluctuations and proactively turns heating on/off to prevent unwanted temperature deviations. RT520 offers 3 TPI control modes:

• RAD: For radiators (6 CPH - cycles per hour).
• PARD: For underfloor heating (3 CPH).
• ELEC: For electric heating (9 CPH).

Hysteresis Mode: This mode allows a fixed deviation between the set temperature and the measured temperature.

1. Select the hysteresis value using [UP ARROW] or [DOWN ARROW] and press [SELECT].

Optimum Stop Function: This function calculates how long it takes for the dwelling to cool down and switches off the boiler as soon as possible, meaning the heating system does not operate when not needed. In case of heat loss during this period, the Optimum Stop function will override to reach comfortable heating conditions.

Optimum Start Function: This function is based on an algorithm to reach the set room temperature at the optimal time. Depending on the thermal inertia of the heating system where the thermostat is installed, it will start the boiler in advance so that the set temperature is reached at the scheduled time.

Owner (Administrator) Settings

Owner Settings is a function that can be secured with a PIN code. It allows the thermostat owner to set a service alert, which will warn the tenant when periodic boiler maintenance is due. WARNING: Losing the PIN code may lead to the inability to use the thermostat.

1. Press [MENU].
2. Navigate to the Owner submenu using [UP ARROW] or [DOWN ARROW] and press [SELECT].
3. Enter the PIN code using [UP ARROW] or [DOWN ARROW]. Press [SELECT] to confirm each digit. (Default PIN: 0000)
4. Press [SELECT].
5. Select ON or OFF using [UP ARROW] or [DOWN ARROW] and press [SELECT].
6. Select the warning period and press [SELECT].
7. Enter the phone number using [UP ARROW] or [DOWN ARROW]. Press [SELECT] to confirm each digit.
8. Press [SELECT] to confirm.
9. You can now check the settings. If you wish to modify a setting, press [UP ARROW] or [DOWN ARROW] on the relevant screen.

Service Mode: Once Service Mode is active, the device will remain locked at the temperature set by the installer/administrator. To unlock this device, the owner must be contacted for boiler servicing.

Synchronization between RT520TX Thermostat and Receiver

During the synchronization process, ensure the thermostat and receiver are at least 1 meter apart.

If you are using the RT520RF package, synchronization is performed at the factory.

To re-sync:

1. Disconnect the receiver from the power supply.
2. Ensure the receiver buttons are in the AUTO and ON positions.
3. Connect the receiver to the power supply and wait for the LED to turn solid red.
4. Move the switch to the OFF position and immediately back to the ON position. The red LED will flash, indicating the start of Synchronization mode.
5. Press [MENU].
6. Navigate to the PAIR submenu using [UP ARROW] or [DOWN ARROW] and press [SELECT].
7. Select PAIR and press [SELECT].
8. Select the execution date using [UP ARROW] or [DOWN ARROW] and press [SELECT].
9. The synchronization process can take up to 10 minutes.
10. Once the devices are successfully synchronized, the LED indicator will turn solid red.

Test Synchronization:

1. Press [MENU].
2. Navigate to the PAIR submenu using [UP ARROW] or [DOWN ARROW] and press [SELECT].
3. Select TEST and press [SELECT].
4. The testing process can take up to 10 minutes.
5. The red and green LEDs on the receiver will start flashing.

Programming - Auto Mode

In this mode, the user can set programs for the thermostat (reference temperature values for specific time periods). When programming, all time intervals must be used, even if the same temperature value needs to be assigned.

1. Press [MENU].
2. Navigate to the PROGRAM submenu using [UP ARROW] or [DOWN ARROW] and press [SELECT].
3. Select the program type:
   • 5+2: (Program for weekdays and weekend)
   • All: (Single program for the entire week)
   • Individual: (Program for each day separately)
4. Press [SELECT].
5. Select ON or OFF using [UP ARROW] or [DOWN ARROW] and press [SELECT].
6. Set the hour using [UP ARROW] or [DOWN ARROW] and press [SELECT].
7. Set the minutes using [UP ARROW] or [DOWN ARROW] and press [SELECT].
8. Repeat the process for all time periods.
9. Use [UP ARROW] or [DOWN ARROW] to set the temperature and press [SELECT].

Example: Setting a program for 06:00 at 18.0°C.

Thermostat Reset

To reset the thermostat, press [MENU], [DOWN ARROW], and [TEMPORARY MANUAL BOOST] simultaneously for 5 seconds.

Administrator settings will not be reset.

Your device will be reset to factory settings and will restart automatically.