Salus RT520 & RT520RF Thermostats and RT520TX Receiver Quick Start Guide

Introduction

The SALUS RT520 and RT520RF are the latest thermostats in the proven RT series. Their new integrated compensation function offers an economical solution, providing homeowners with optimal performance and maximum heating control comfort. Two thermostat variants are available: with wired or wireless connection. The thermostats feature a large, intuitive LCD display and new functionalities. Please read this manual carefully before use.

Product Compliance

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

[Radio Frequency: 868.0-868.6MHz; <13dBm]

Safety Information

Use in accordance with national and EU regulations. Use the device as intended and keep it dry. The product is intended for indoor use only. Installation must be performed by a qualified person in accordance with national and EU regulations.

Before installing or working on any components (including battery replacement), always ensure the mains power supply is switched off. Use only AA 1.5V alkaline batteries in the thermostat. Insert batteries into the battery compartment located on the back of the thermostat. Do not use rechargeable batteries.

Technical Specifications

Button Functions

RT520 / RT520RF Thermostat Buttons

• 1. MENU: Enter menu options. Press and hold for 3 seconds to return to the main screen or deactivate the BOOST function.
• 2. SELECT: Confirm changes and enter menus.
• 3. DOWN: Decrease temperature and navigate menus.
• 4. UP: Increase temperature and navigate menus.
• 5. BOOST: Activate the BOOST function.
• 6. MANUAL: Activate/deactivate manual mode.

RXRT520 Receiver Buttons

• 7. ON: In manual mode, ON turns on the boiler.
• 8. OFF: In manual mode, OFF turns off the boiler.
• 9. AUTO: The receiver operates in automatic mode according to the thermostat.
• 10. MANUAL: The receiver output is controlled by the On/Off switch.

Wiring Diagrams

RT520 Thermostat Wiring

Terminals:

• B/A: OpenTherm Communication Terminals
• NC: Normally Closed Contact
• NO: Normally Open Contact
• COM: Common Terminal

Wiring Connections:

• Connect OpenTherm communication wires to B/A.
• Connect boiler control wires to NO/COM or NC/COM depending on boiler type.

RT520TX Receiver Wiring

Terminals:

• N, L: Power Supply (230V AC)
• COM, NO: Switched Output (Volt-free NO contact)
• A/B: OpenTherm Communication Terminals

Wiring Connections:

• Connect N and L to 230V AC power.
• Connect COM and NO to the boiler or heating system control input.
• Connect A/B to the boiler's OpenTherm terminals.

Diagram Description: Shows connections for RT520 thermostat to boiler (OpenTherm, NO/COM, NC/COM) and RT520TX receiver to 230V AC power and boiler control (COM/NO, OpenTherm A/B).

LCD Display Icons Description

The thermostat's LCD display shows various icons:

• 1. Text Line: Displays messages or status.
• 2. Temperature Unit: Indicates °C.
• 3A. Day of the Week (Numeric): e.g., 1 for Monday.
• 3B. Day of the Week (Alphabetic): e.g., MON for Monday.
• 4. Clock: Displays current time.
• 5. Cooling Mode: Icon indicates cooling is active.
• 6. Holiday Mode: Icon indicates holiday mode is active.
• 7. Manual Mode: Icon indicates manual mode is active.
• 8. Heating Mode: Icon indicates heating mode is active.
• 9. Low Battery Indicator: Icon shows when batteries are low.
• 10. Low Battery Status: Textual indicator for low battery.
• 11. Wireless Communication: Icon indicates wireless connection with the receiver.
• 12. Service Mode: Icon indicates service mode is active.
• 13. Measured/Set Temperature: Displays current room temperature and target temperature.
• 14. Program Number: Shows the current program number.
• 15. Setting: Indicates a setting is being adjusted.
• 16. Program Indicator: Shows program status.
• 17. BOOST Function: Icon indicates BOOST is active.

OpenTherm Control Configuration

OpenTherm is a modulation control method used by modern heating systems. Instead of regularly switching the boiler on and off, it allows modulation to control the heat output to match the thermostat's demands. This results in higher system efficiency, energy savings, and increased comfort.

Initial Setup Steps:

1. Insert Batteries: After inserting batteries, the thermostat will power on.
2. Select Language: Press [Select]. Use [Up] or [Down] buttons to choose your language and press [Select].
3. Time Format: Use [Up] or [Down] buttons to select time format (12 hr or 24 hr). Press [Select] to confirm.
4. Set Time: Press [Select]. Use [Up] or [Down] buttons to set the hours, then press [Select]. Use [Up] or [Down] buttons to set the minutes, then press [Select].
5. Set Date: Press [Select]. Use [Up] or [Down] buttons to set the year, then press [Select]. Use [Up] or [Down] buttons to set the month, then press [Select]. Use [Up] or [Down] buttons to set the day, then press [Select].
6. Day Format: Use [Up] or [Down] buttons to select the week format. Press [Select] to confirm.
7. DST Setting: Press [Select]. Use [Up] or [Down] buttons to activate or deactivate DST (Daylight Saving Time). Press [Select] to confirm.
8. Temperature Sensitivity: Press [Select]. Use [Up] or [Down] buttons to set the temperature display sensitivity and press [Select].

Note: If OpenTherm is connected, the thermostat software will automatically adapt the OpenTherm settings.

Diagram Description: Illustrates sequential LCD screens showing language selection, time format selection, time setting (hours, minutes), date setting (year, month, day), day format selection, DST activation, and temperature sensitivity setting.

OpenTherm - Hot Water (TUV) Configuration

1. Press the [Menu] button.
2. Use [Up] or [Down] buttons to navigate to the TUV submenu and press [Select].
3. Use [Up] or [Down] buttons to set the desired hot water temperature and press [Select].

The thermostat will return to the main screen. Press any button. A text line will indicate that Hot Water is active.

Diagram Description: Shows LCD screens for accessing the TUV menu, setting the hot water temperature, and confirmation of TUV activation.

Standard Control Configuration

Follow steps 1 to 17 from the OpenTherm Control Configuration section. Note: Use [Up] or [Down] buttons to choose either TPI or SPAN. Selecting one option excludes the other.

TPI (Time Proportional & Integral)

TPI is a self-learning time-proportional algorithm that ensures economical system operation by maintaining temperature more precisely and limiting frequent heat source switching. Benefits include stable room temperature, minimized energy consumption, and savings. RT520 offers 3 TPI control types:

• 1. For Radiator (6 CPH)
• 2. For Underfloor Heating (3 CPH)
• 3. For Electric Heating (9 CPH)

Configuration Steps:

1. Press [Select].
2. Use [Up] or [Down] buttons to select the desired TPI type and press [Select] to confirm.

SPAN (Hysteresis)

SPAN is the difference between the measured temperature and the set temperature (hysteresis).

1. Press [Select].
2. Use [Up] or [Down] buttons to select the SPAN value and press [Select] to confirm.

Optimal Start

Optimal Start is an optional feature that initiates boiler operation at the optimal time to reach the desired temperature, depending on the ambient room temperature. It saves energy by running the boiler only for the minimum required time.

Optimal Stop

Optimal Stop calculates how long the room will cool down and then switches off the boiler as soon as possible, meaning the system does not run when not needed. If there is a sudden heat loss, Optimal Stop will be overridden to maintain comfort.

Diagram Description: Illustrates LCD screens for selecting TPI types (TPI RAD, TPI UFH, TPI EL), setting SPAN values (e.g., 1.0, 1.5, 2.0), and activating/deactivating Optimal Start and Optimal Stop.

Programming - Automatic Mode

The schedule has 6 time intervals for which different temperatures can be set. You can set 2, 3, or up to 6 temperature segments per day. All time segments must be defined. The following is an example of setting a specific time segment and temperature.

Setting a Time Segment:

1. Press [Select].
2. Use [Up] or [Down] buttons to select the desired program type (e.g., [+2] for weekdays/weekends, [All] for the whole week, [Individual] for daily schedules). Press [Select] to confirm.
3. Press [Select].
4. Use [Up] or [Down] buttons to set the desired temperature for the selected time segment and press [Select].
5. Repeat the process for all desired time periods.

Removing a Time Segment:

1. In the time segment you wish to remove, press the [Up] arrow repeatedly until dashes appear on the display.
2. Once dashes appear, press [Select] to confirm the removal of that time segment.

Example Schedule: Shows a weekly schedule with example ON times (higher temperature) and OFF times (lower temperature) for 6 temperature/day or 2 temperature/day settings.

Checking Settings:

You can now check your settings. To make a change, press the [Up] or [Down] button on the relevant screen.

Diagram Description: Shows LCD screens for selecting program types, setting temperatures for different time intervals, and an example of removing a time segment by displaying dashes. Also shows a comparison of 6 Temps/Day vs. 2 Temps/Day with example times and temperatures.

Admin Settings

Admin Settings is a PIN-protected function that allows a landlord to set a service reminder on the thermostat, alerting the tenant for annual servicing.

1. Press the [Menu] button.
2. Use [Up] or [Down] buttons to navigate to the Admin submenu and press [Select].
3. Use [Up] or [Down] buttons to enter the PIN code digits. Press [Select] to confirm each digit.
4. Press [Menu].
5. Press [Select].
6. Use [Up] or [Down] buttons to select [On] and press [Select].
7. Use [Up] or [Down] buttons to select the service due date and press [Select].
8. Use [Up] or [Down] buttons to select the number of days until service and press [Select].
9. Use [Up] or [Down] buttons to select the desired temperature to be locked in service mode and press [Select].

Note: Once service mode is active, the thermostat will lock the desired temperature according to the installer/landlord's settings. To unlock this device, contact the installer/landlord.

Diagram Description: Illustrates LCD screens for accessing Admin settings, entering a PIN code, enabling service reminders, setting the service date, and locking a temperature.

Pairing RT520TX Thermostat with Receiver

If you own an RT520RF kit, the pairing between the thermostat and receiver is already done. During the pairing process, ensure the thermostat and receiver are at least 1 meter apart.

If you purchased the RT520TX unit and RXRT520 receiver separately, or wish to re-pair the thermostat with the receiver, ensure the device is disconnected from power and the switches on the receiver are set to AUTO and ON. Then, connect the receiver to power and wait for the red LED to light up or blink. Switch to OFF and then quickly back to ON (within 2 seconds). The red LED will blink, indicating entry into pairing mode.

1. Press the [Menu] button.
2. Use [Up] or [Down] buttons to navigate to the Pairing submenu and press [Select].
3. Use [Up] or [Down] buttons to select [Pairing] and press [Select].
4. The pairing process takes up to 10 minutes. Once the devices are successfully paired, the red LED on the receiver will light up permanently.

Diagram Description: Shows receiver switches set to AUTO and ON, followed by switching to OFF and then ON to initiate pairing mode (blinking red LED). Also shows a permanently lit red LED indicating successful pairing.

Pairing Test Process

1. Press the [Menu] button.
2. Use [Up] or [Down] buttons to navigate to the Pairing submenu and press [Select].
3. Use [Up] or [Down] buttons to select [TEST] and press [Select].
4. Use [Up] or [Down] buttons to set the hour and press [Select].
5. Use [Up] or [Down] buttons to set the minutes and press [Select].
6. Use [Up] or [Down] buttons to set the temperature and press [Select].

The test process takes up to 10 minutes. The red LED and green LED on the receiver will start blinking. This is a test of the pairing process.

Diagram Description: Shows LCD screens for setting time (hour, minute) and temperature for the pairing test. Also shows blinking red and green LEDs on the receiver.

Factory Reset

To reset the thermostat, simultaneously press the [MENU], [DOWN], and [BOOST] buttons for 5 seconds. The device will reset and start automatically. Admin settings will not be reset.

Diagram Description: Shows the thermostat with the MENU, DOWN, and BOOST buttons highlighted, indicating they should be pressed simultaneously.

Distributor, Importer, Producer

DISTRIBUTOR:
Thermo-control CZ s.r.o.
Sychrov 2, 621 00 Brno, Czech Republic
Email: obchod@thermo-control.cz

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

Salus Controls is a member of the Computime Group. Salus Controls reserves the right to change the specification, appearance, and material of the product described in this manual without prior notice.

Release Date: July 2021 V016

[CE EAC] [ISO 9001 Certified]