Salus Controls RT520, RT520TX, RT520RF Thermostat User Manual

Introduction

The RT520 (wired model) and RT520RF (wireless model) thermostats are the latest additions to SALUS's RT series. These advanced thermostats incorporate all existing RT series functions while introducing new features and properties to enhance efficiency and user comfort. Key highlights include a large LCD display, intuitive programming and settings, and additional operational functions. Notably, these devices utilize the OpenTherm protocol and the TPI algorithm, which adapt to room characteristics and optimize the performance of the heating equipment. Please read this manual carefully before use.

Declaration of Conformity

This product complies with the following Directives: EMC 2014/30/EU, LVD 2014/35/EU, and RoHS 2011/65/EU. For full information regarding the Declaration of Conformity, please visit our website: www.saluslegal.com. (868.0-868.6MHz; <13dBm)

Safety Information

Use the equipment strictly according to the instructions provided. This device is intended for indoor use only. Installation must be performed by a qualified specialist. The installation must comply with all applicable instructions, norms, and regulations in the city, country, or state where it is installed. Failure to adhere to relevant instructions, standards, and rules may result in malfunction, personal injury, death, or legal consequences.

Before commencing any installation, repair, or maintenance work, and during all connection procedures, ensure the power supply is disconnected (this includes battery replacement). Use only 1.5V AA alkaline batteries. Do not use rechargeable batteries. Insert batteries into the compartment located on the back of the thermostat.

Technical Specifications

Feature	RT520 Thermostat	RT520TX Transmitter	RXRT520 Receiver
Power Supply	2 x AA alkaline batteries	2 x AA alkaline batteries	AC 230V
Max. Load	3 (1) A	-	16 (5) A
Temperature Adjustment Range	5°C - 33.5°C	5°C - 33.5°C	5°C - 33.5°C
Temperature Display Accuracy	0.1°C or 0.5°C	0.1°C or 0.5°C	0.1°C or 0.5°C
ErP Class	V	-	V
Radio Frequency	-	868 MHz	868 MHz
Dimensions [mm]	118 x 95 x 26	118 x 95 x 26	96 x 96 x 26

Button Functions (RT520/RT520RF)

1. [MENU]: Enter menu; press and hold for approximately 3 seconds to return to the main screen or deactivate Boost mode.
2. [SELECT]: Confirm selection, enter menu.
3. [DOWN]: Decrease set temperature, move to the next function in the menu.
4. [UP]: Increase set temperature, move to the previous function in the menu.
5. [BOOST]: Activate Boost mode (temporary manual mode).
6. [MANUAL]: Activate/deactivate manual mode.

Screen Icon Descriptions

1. Text panel: Displays information.
2. Measurement units: Displays temperature units (°C).
3. Day of the week (digital): Displays the day of the week numerically (1-7).
4. Day of the week (letter): Displays the day of the week using abbreviations (MON, TUE, etc.).
5. Time: Displays current time, with an indicator for AM/PM.
6. Cooling mode: Indicates that the system is in cooling mode.
7. Holiday mode: Indicates that the holiday program is active.
8. Manual mode: Indicates that manual temperature control is active.
9. Heating mode: Indicates that the system is in heating mode.
10. Battery status indicator: Shows the remaining battery level.
11. Wireless connection: Indicates the status of the wireless connection with the receiver.
12. Service mode: Indicates that the thermostat is in service or diagnostic mode.
13. Measured / Set temperature: Displays the current room temperature and the target set temperature.
14. Program number: Shows the currently active program number.
15. Settings: Indicates that the device is in the settings menu.
16. Program indicator: Shows that a programmed schedule is active.
17. Boost mode: Indicates that the Boost function is active.

Terminal Descriptions

RT520 Thermostat Terminals

B/A: OpenTherm Communication Wire.
NC: Normally Closed Contact (used for switching).
NO: Normally Open Contact (used for switching).
COM: Common Terminal (used for switching).

RXRT520 Receiver Terminals

B/A: OpenTherm Communication Wire.
NC/NO/COM: Potential-free Terminals for switching the heating system (Normally Closed, Normally Open, Common).
L; N: Power Supply (230 V AC).

Connection Schematics

RT520TX Transmitter & RXRT520 Receiver (TPI or Hysteresis Modes)

This configuration involves wireless communication between the RT520TX transmitter and the RXRT520 receiver. The RXRT520 receiver is powered by AC 230V and connects to the heating system via its COM, NO, and NC terminals to control the boiler.

RT520TX Transmitter & RXRT520 Receiver (OpenTherm Mode)

In this setup, the RT520TX transmitter communicates wirelessly with the RXRT520 receiver. Additionally, the RT520TX connects to the boiler using OpenTherm terminals (B/A) for advanced boiler modulation. The RXRT520 receiver is powered by AC 230V and controls the heating system via its COM, NO, and NC terminals.

RT520 Thermostat & RXRT520 Receiver (TPI or Hysteresis Modes)

This wired setup connects the RT520 thermostat directly to the RXRT520 receiver. The RT520 uses its terminals (N, L, COM, NO, NC) for this connection. The RXRT520 receiver is powered by AC 230V and controls the heating system via its COM, NO, and NC terminals.

RT520 Thermostat & RXRT520 Receiver (OpenTherm Mode)

In this wired configuration, the RT520 thermostat connects to the RXRT520 receiver. The RT520 uses OpenTherm terminals (B/A) for communication with the boiler and N, L terminals for power. The RXRT520 receiver is powered by AC 230V and controls the heating system via its COM, NO, and NC terminals.

OpenTherm Protocol

The OpenTherm protocol is an advanced method used in modern boiler systems that enables modulating (variable) heat output. Unlike simple on/off control, OpenTherm communication allows the thermostat to signal the boiler's exact heating demand based on room conditions. This results in more precise temperature control, increased energy efficiency, extended boiler lifespan, and enhanced user comfort.

Note: Before installing batteries in the regulator, connect the receiver unit and ensure it is powered on.

OpenTherm - Hot Water Supply (DHW)

When using OpenTherm, the system can also manage domestic hot water (DHW) heating. The thermostat will display information related to DHW preparation.

To set DHW temperature:

Using the [UP]/[DOWN] buttons, navigate to the DHW (Domestic Hot Water) submenu and press [SELECT].
Using the [UP]/[DOWN] buttons, set the desired hot water temperature, then press [SELECT].
The thermostat will return to the main menu. Press any button to confirm or exit.

Information will appear on the text panel indicating that the DHW is heating.

Setting Time, Date, and DST

Follow these steps to set the clock and date:

Using the [UP]/[DOWN] buttons, select the time format (12/24 hour). Press [SELECT] to confirm.
Using the [UP]/[DOWN] buttons, set the hours. Press [SELECT] to confirm.
Using the [UP]/[DOWN] buttons, set the minutes. Press [SELECT] to confirm.
Using the [UP]/[DOWN] buttons, set the year. Press [SELECT] to confirm.
Using the [UP]/[DOWN] buttons, set the month. Press [SELECT] to confirm.
Using the [UP]/[DOWN] buttons, set the day. Press [SELECT] to confirm.
Using the [UP]/[DOWN] buttons, select the display format for the days of the week. Press [SELECT] to confirm.
Using the [UP]/[DOWN] buttons, enable or disable DST (Daylight Saving Time). Press [SELECT] to confirm.

Setting Temperature Display Step

You can adjust how the temperature is displayed:

Using the [UP]/[DOWN] buttons, set the temperature display step (e.g., 0.1°C or 0.5°C). Press [SELECT] to confirm.

TPI Mode (Time Proportional & Integral)

TPI is an advanced algorithm designed to optimize heating system performance. It ensures the room temperature remains as close as possible to the setpoint, minimizing fluctuations and maximizing energy savings. The RT520 offers three TPI modes:

1. 6 CPH (Cycles Per Hour): A standard cycle rate.
2. 3 CPH: A slower cycle rate, suitable for well-insulated rooms or systems with high thermal mass.
3. 9 CPH: A faster cycle rate, suitable for rooms with poor insulation or rapid heat loss.

The thermostat intelligently adjusts the heating output based on the room's heating demand and the selected TPI algorithm. For example, if the set temperature is 20°C, the TPI mode aims to maintain the temperature within a narrow band, such as between 19.75°C and 20.25°C.

Hysteresis Mode

Hysteresis mode provides a simpler control method. The heating system turns ON when the room temperature drops below the setpoint minus the hysteresis value, and turns OFF when it rises above the setpoint plus the hysteresis value. This creates a small temperature band to prevent rapid cycling.

Example: With a set temperature of 20°C and a hysteresis of 0.5°C, the heating will activate at 19.5°C and deactivate at 20.5°C.

Boost Mode

The Boost function provides temporary manual heating for a pre-set duration (e.g., 10 minutes). Pressing the [BOOST] button activates this feature. The thermostat will automatically revert to its programmed schedule once the Boost period has ended, ensuring energy efficiency.

Manual Mode

Manual mode allows you to set a constant desired temperature, overriding the programmed schedule. Use the [UP] and [DOWN] buttons to select your preferred temperature. Press the [MANUAL] button to activate or deactivate this mode.

Auto/Program Mode

In Auto mode, the thermostat follows the programmed schedule. It automatically switches between different temperature settings based on the time of day and day of the week, providing comfort and energy savings.

Holiday Mode

Holiday mode is designed for extended absences. It allows you to set a lower, energy-saving temperature for a specific period. The thermostat will automatically resume normal operation at the end of the set holiday period, ensuring your home is warm upon your return.

Service Mode

Service mode is typically used by installers or technicians for diagnostic purposes, testing specific functions, or making advanced configuration changes. Access to this mode may be restricted.

Wireless Pairing (RT520TX/RT520RF with RXRT520)

The RT520TX (transmitter) or RT520RF (wireless thermostat) communicates wirelessly with the RXRT520 receiver. Ensure the RXRT520 receiver is powered on before initiating the pairing process. Follow the on-screen prompts on the thermostat to establish a connection. The RXRT520 receiver also features manual ON/OFF switches for direct control.

Contact Information

Russia: russia@salus-controls.eu, tel. +7 (495) 773-09-45

Ukraine: service.ukraine@salus-controls.eu, tel. +38 (050) 010 81 31 ext. 902

Belarus: info@euroterm.by, tel. +375 29 366 71 04

Importer: QL CONTROLS Sp. z o.o. Sp. k., ul. Rolna 4, 43-262 Kobielice

Producer: Salus Limited, 6/F, Building 20E, Phase 3, Hong Kong Science Park, 20 Science Park East Avenue, Shatin, New Territories, Hong Kong

Website: www.salus-controls.eu

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