SALUS RT520, RT520TX, RT520RF Quick Guide

Introduction

The RT520 and RT520RF are the latest additions to SALUS' tried and tested RT range of thermostat heating controls. With a new on-board load compensation feature, they offer the most cost effective fully compliant Boiler Plus solution on the market providing the homeowner with optimum efficiency and maximum heating control comfort. Available in both wired and wireless RF versions, the new RT520 series include all the features of the previous RT series with a larger more intuitive LCD display and a handy new suite of additional operational and efficiency functions.

Before use, please read this manual carefully.

Product Compliance

This product complies with the essential requirements and other relevant provisions of the following EU Directives: EMC 2014/30/EU, LVD 2014/35/EU, RED 2014/53/EU and RoHS 2011/65/EU.

Full text of the EU Declaration of Conformity is available on www.saluslegal.com.

(()) 868.0-868.6MHz; <13dBm

Safety Information

Use in accordance with national and EU regulations. Use the device as intended, keeping it in dry condition. Product for indoor use only. Installation must be carried out by a qualified person in accordance with national and EU regulations.

Always ensure the AC mains power is switched off before installing or working on any components (this includes replacing the batteries). Use only AA 1.5 V alkaline batteries in the thermostat. Place the batteries into the battery slot located in the back of the thermostat. Do not use rechargeable batteries.

Technical Specifications

Button Functions

RT520 / RT520RF Thermostat

• MENU ☰: Enter menu options, press and hold for 3 sec to return to main screen or to deactivate Boost Mode.
• SELECT ✔️: Confirm changes and enter menus.
• DOWN ⬇️: Decrease temperature and move through menus.
• UP ⬆️: Increase temperature and move through menus.
• BOOST ?: Activate Boost Mode.
• MANUAL ?: Activate / deactivate Manual Mode.

RXRT520 Receiver

• ON ▶️: When in Manual Mode, ON will turn the boiler on.
• OFF ⏹️: When in Manual Mode, OFF will turn the boiler off.
• AUTO ?: Receiver operates in automatic mode according to the thermostat.
• MANUAL ?: Receiver output is controlled by the On/Off slide switch.

LCD Icon Description

• 1 Text Bar
• 2 Temperature Unit
• 3A Day of the week (numeric)
• 3B Day of the week (alphabetic)
• 4 Clock ⏰
• 5 AM/PM
• 6 Cooling Mode On
• 7 Holiday Mode On
• 8 Manual Mode On ?
• 9 Heating Mode On
• 10 Low battery status ?
• 11 Wireless connection with the receiver ?
• 12 Service Mode On ⚙️
• 13 Temperature measured / set ℃
• 14 Program number ?
• 15 Settings ⚙️
• 16 Program indicator
• 17 Boost function ?

Terminal Descriptions

RT520 Thermostat Terminals

RXRT520 Receiver Terminals

Wiring Diagrams

RT520 Wiring Diagram (TPI, SPAN, OPENTHERM): This diagram illustrates the connections for the RT520 thermostat, showing its integration with OpenTherm communication and TPI/SPAN control options.

RT520TX Wiring Diagram (TPI, SPAN, OPENTHERM): This diagram details the wiring for the RT520TX thermostat, including TPI, SPAN, and OpenTherm functionalities, connecting to the RXRT520 receiver.

OpenTherm Power Up and Configuration

OpenTherm Modulating Control is an advanced method for modern heating systems. It allows the boiler's heat output to be precisely controlled based on the thermostat's demand, rather than simple on/off switching. This results in improved system efficiency, energy savings, and enhanced room comfort.

Important: Connect the receiver and power it before inserting batteries into the thermostat.

Step 1: After inserting batteries, the thermostat powers up.

Step 2: Press SELECT ✔️. Use UP ⬆️ or DOWN ⬇️ to choose your desired language ? and press SELECT ✔️.

Step 3: Press MENU ☰. Use UP ⬆️ or DOWN ⬇️ to navigate to the Hot Water ? submenu and press SELECT ✔️.

Step 4: Use UP ⬆️ or DOWN ⬇️ to adjust the hot water temperature and press SELECT ✔️.

Step 5: Use UP ⬆️ or DOWN ⬇️ to choose the time format ⏰ (12 hr / 24 hr) and press SELECT ✔️.

Step 6: Use UP ⬆️ or DOWN ⬇️ to set the hour and press SELECT ✔️.

Step 7: Use UP ⬆️ or DOWN ⬇️ to set the minutes and press SELECT ✔️.

Step 8: Use UP ⬆️ or DOWN ⬇️ to set the year ? and press SELECT ✔️.

Step 9: Use UP ⬆️ or DOWN ⬇️ to set the month ?️ and press SELECT ✔️.

Step 10: Use UP ⬆️ or DOWN ⬇️ to set the day ☀️ and press SELECT ✔️.

Step 11: Use UP ⬆️ or DOWN ⬇️ to select the week format and press SELECT ✔️.

Step 12: Press SELECT ✔️ to confirm.

Step 13: Use UP ⬆️ or DOWN ⬇️ to enable or disable DST (Daylight Saving Time) and press SELECT ✔️.

Step 14: Press SELECT ✔️.

Step 15: Use UP ⬆️ or DOWN ⬇️ to select your temperature accuracy (0.1°C or 0.5°C) and press SELECT ✔️.

Step 16: Press SELECT ✔️ to confirm.

Step 17: Press SELECT ✔️ to confirm.

Step 18: When OpenTherm is connected, the device software automatically adjusts to OpenTherm settings. The thermostat returns to the main screen. Press any button. The text bar indicates that hot water is in operation. ?

Standard Power Up and Configuration

Follow steps 1 to 17 from the OpenTherm Power Up and Configuration section. Note: You can choose either TPI (step 2) or SPAN (step 6) using UP ⬆️ or DOWN ⬇️. Choosing one excludes the other.

TPI (Time Proportional & Integral)

TPI is a self-learning, time-proportional algorithm that ensures economical system operation, accurate temperature maintenance, and limits overload conditions. It minimizes energy consumption and provides significant savings. RT520 offers 3 types of TPI control: 1. for radiator (6CPH); 2. for underfloor heating (3CPH); 3. for electric heating (9CPH).

Step 2: Press SELECT ✔️. Use UP ⬆️ or DOWN ⬇️ to select the TPI type and press SELECT ✔️.

SPAN

Span is the difference between the measured temperature and the set temperature.

Step 6: Press SELECT ✔️. Use UP ⬆️ or DOWN ⬇️ to select the Span value and press SELECT ✔️.

Optimum Start

Optimum Start is a selectable function that, based on the ambient room temperature, starts the boiler at the optimal time to achieve the set-point temperature. It saves energy by firing the boiler only for the minimum required time.

Optimum Stop

Optimum Stop calculates how long the house will take to cool down and turns off the boiler at the earliest possible moment. If there is a sudden heat loss, Optimum Stop will be overridden to regain comfort conditions.

Programming - Automatic Mode

In this mode, users can set schedules for the thermostat, defining temperature setpoints for specific periods. Programmed schedules should cover all time periods.

Step 1: Press SELECT ✔️.

Step 2: Use UP ⬆️ or DOWN ⬇️ to select the program type:

• +2 (schedule for working days and for the weekend)
• All (set one schedule for the entire week)
• Individual (set a daily schedule)

Press SELECT ✔️ to confirm.

Step 3: Use UP ⬆️ or DOWN ⬇️ to select the warning period ⚠️ and press SELECT ✔️.

Step 4: Use UP ⬆️ or DOWN ⬇️ to select the lock temperature ? and press SELECT ✔️.

Step 5: Use UP ⬆️ or DOWN ⬇️ to enter the phone number ?. Press SELECT ✔️ to confirm each digit.

Step 6: Press SELECT ✔️.

Step 7: Use UP ⬆️ or DOWN ⬇️ to select ON ▶️ or OFF ⏹️ and press SELECT ✔️.

Step 8: Use UP ⬆️ or DOWN ⬇️ to set the hour ⏰ and press SELECT ✔️.

Step 9: Use UP ⬆️ or DOWN ⬇️ to set the minutes and press SELECT ✔️.

Step 10: Repeat the process for all time periods.

Step 11: Use UP ⬆️ or DOWN ⬇️ to set the temperature ℃ and press SELECT ✔️.

Step 12: Once service mode is active, the device locks the set point temperature. To unlock, contact the landlord for boiler servicing. Landlord settings will not be reset.

Landlord Settings

Landlord settings is a PIN code protected feature that allows the landlord to set a service reminder on the thermostat. This warns the tenant when the boiler is due its annual service.

Step 1: Press MENU ☰.

Step 2: Use UP ⬆️ or DOWN ⬇️ to navigate to the Landlord submenu and press SELECT ✔️.

Step 3: Use UP ⬆️ or DOWN ⬇️ to enter the PIN code number. Press SELECT ✔️ to confirm every digit.

Step 4: Use UP ⬆️ or DOWN ⬇️ to select ON ▶️ and press SELECT ✔️.

Step 5: Use UP ⬆️ or DOWN ⬇️ to select the due date and press SELECT ✔️.

Step 6: Now you can check your settings. If you want to make a change, press UP ⬆️ or DOWN ⬇️ on the relevant screen.

RT520TX Thermostat Pairing with the Receiver

If you are using the RT520RF pack, the pairing between the thermostat and receiver is already done. For separate RT520TX and RXRT520 units, or for re-pairing:

Preparation: Ensure the thermostat and receiver are at least 1 meter apart. Disconnect the receiver from power. Set receiver switches to AUTO ? and ON ▶️. Connect receiver to power and wait for the red LED to light steadily. Switch the receiver to OFF ⏹️, then quickly back to ON ▶️. A flashing red LED indicates pairing mode.

Step 1: Press MENU ☰.

Step 2: Use UP ⬆️ or DOWN ⬇️ to navigate to the Pairing submenu ? and press SELECT ✔️.

Step 3: Use UP ⬆️ or DOWN ⬇️ to select PAIR and press SELECT ✔️.

The pairing process takes up to 10 minutes.

Result: Once devices are successfully paired, the LED on the receiver will go solid red. ?

Test the Pairing Process

Step 1: Press MENU ☰.

Step 2: Use UP ⬆️ or DOWN ⬇️ to navigate to the Pairing submenu ? and press SELECT ✔️.

Step 3: Use UP ⬆️ or DOWN ⬇️ to select TEST ? and press SELECT ✔️.

The testing process takes up to 10 minutes.

Result: The red LED and the green LED on the receiver will begin to flash. ??

Factory Reset

Step 1: To reset the thermostat, press MENU ☰, DOWN ⬇️, and BOOST ? simultaneously for 5 seconds.

Step 2: The device will reset and start up automatically. Landlord settings will not be reset.