SALUS RT520 Series Programmable Thermostats - Quick Guide

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. The full text of the EU Declaration of Conformity is available at www.saluslegal.com. Radio frequency: 868.0-868.6MHz; <13dBm.

Safety Information

Use the product in compliance with national and European regulations. Use the device as intended and keep it dry. This product is designed for indoor use only. Only a qualified person is authorized to install this product according to national and European regulations. Always disconnect the power supply before installing or working on components (this includes battery replacement). Use only 1.5V AA alkaline batteries in the thermostat. Do not use rechargeable batteries.

Technical Characteristics

Button Functions

Thermostat RT520 / RT520RF / RT520TX

• 1. MENU: Enter menu options; hold for 3 seconds to return to the main screen or disable Frost Protection mode.
• 2. SELECT: Confirm changes and access menus.
• 3. DOWN ARROW: Decrease temperature and navigate menus.
• 4. UP ARROW: Increase temperature and navigate menus.
• +HR: Activate Frost Protection mode.
• MANUAL: Activate/deactivate manual mode.
• ON: In manual mode, turns the boiler ON.
• OFF: In manual mode, turns the boiler OFF.
• AUTO: The receiver operates in automatic mode based on the thermostat.
• MANUAL: The receiver output is controlled by the On/Off switch.

LCD Icon Description

The thermostat features an LCD screen with various indicators:

• 1. Text Bar: Displays text messages.
• 2. Temperature Unit: Shows the unit (°C).
• 3A. Day of the Week (Numeric): Displays the current day numerically (1-7).
• 3B. Day of the Week (Alphabetic): Displays the current day alphabetically (Mon-Sun).
• 4. Clock: Shows the current time.
• 5. AM / PM: Indicates AM or PM for the time.
• 6. Cooling Mode Active: ❄️ Icon indicates cooling mode is active.
• 7. Holiday Mode Active: ?️ Icon indicates holiday mode is active.
• 8. Manual Mode Active: [Manual] Icon indicates manual mode is active.
• 9. Heating Mode Active: ? Icon indicates heating mode is active.
• 10. Low Battery Status: ? Icon indicates low battery.
• 11. Wireless Connection to Receiver: ? Icon indicates a stable wireless connection to the receiver.
• 12. Maintenance Mode Active: ? Icon indicates maintenance mode is active.
• 13. Ambient / Setpoint Temperature: Displays the current room temperature and the desired setpoint temperature.
• 14. Program Number: Indicates the current program number.
• 15. Settings: ⚙️ Icon indicates settings menu.
• 16. Program Indicator: Shows the status of the current program.
• 17. Frost Protection / Holiday Override Function: [Frost/Holiday] Icon indicates this function is active.

Wiring Diagrams

RT520TX Thermostat to RXRT520 Receiver Wiring

Receiver RXRT520 Connections:

• AC 230V: Connect Live (L) and Neutral (N) from the mains supply.
• COM: Common terminal.
• NO: Normally Open terminal.
• NL: Not used in this configuration.

Thermostat RT520TX Connections:

• COM: Common terminal.
• NO: Normally Open terminal.
• NC: Normally Closed terminal.
• B / A: OpenTherm communication terminals.

Wiring Description:

Connect the 230V AC mains supply to the N and L terminals on the RXRT520 receiver. Connect the thermostat's COM terminal to the receiver's COM terminal. Connect the thermostat's NO terminal to the receiver's NO terminal. For OpenTherm communication, connect the thermostat's B/A terminals to the receiver's B/A terminals.

Diagrammatic representation:

RT520TX Thermostat [COM, NO, NC, B/A] <-> RXRT520 Receiver [COM, NO, N, L, B/A]

Example wiring for RT520TX to RXRT520:

AC 230 V [N, L] to RXRT520 [N, L].

RT520TX [COM] to RXRT520 [COM].

RT520TX [NO] to RXRT520 [NO].

RT520TX [B/A] to RXRT520 [B/A].

OpenTherm Setup and Configuration

OpenTherm modulating auto-control is a control method used by modern heating systems. Instead of switching a boiler on and off at regular intervals, modulating control allows the boiler's heat output to be controlled to match the thermostat's variable demand. This results in greater system efficiency, energy savings, and increased comfort.

Initial Setup Steps:

1. Ensure connections are made and the receiver is powered before inserting batteries into the thermostat.
2. After inserting batteries, the thermostat will power on. Press [SELECT].
3. Use [UP ARROW] and [DOWN ARROW] to choose your language, then press [SELECT].
4. Use [UP ARROW] or [DOWN ARROW] to choose the time format (12/24 hour), then press [SELECT] to confirm.
5. Use [UP ARROW] or [DOWN ARROW], set the hour, then press [SELECT].
6. Use [UP ARROW] or [DOWN ARROW], set the minutes, then press [SELECT].
7. Use [UP ARROW] or [DOWN ARROW], set the year, then press [SELECT].
8. Use [UP ARROW] or [DOWN ARROW], set the month, then press [SELECT].
9. Use [UP ARROW] or [DOWN ARROW], set the day, then press [SELECT].
10. Use [UP ARROW] or [DOWN ARROW], select the day of the week format, then press [SELECT].
11. Use [UP ARROW] or [DOWN ARROW], enable or disable daylight saving time, then press [SELECT] to confirm.
12. Use [UP ARROW] or [DOWN ARROW], select your temperature accuracy (0.1°C or 0.5°C), then press [SELECT] to confirm.

When OpenTherm is connected, the thermostat software automatically adapts to OpenTherm parameters.

OpenTherm - Domestic Hot Water (DHW) Setup

1. Press [MENU].
2. Use [UP ARROW] or [DOWN ARROW] to access the DHW submenu, then press [SELECT].
3. Use [UP ARROW] or [DOWN ARROW], adjust the DHW temperature, then press [SELECT].

The thermostat will return to the main screen. The text bar will indicate that hot water is active.

Standard Setup and Configuration

Follow steps 1 to 17 from the OpenTherm Setup and Configuration section. NOTE: Using [UP ARROW] and [DOWN ARROW], you can choose PI (step 2) or INTERVAL (step 6). Choosing one option excludes the other.

PI (Proportional-Integral) Mode

PI mode is a self-learning function that ensures economical system operation by maintaining temperature more precisely and limiting overload conditions. It provides stable ambient temperature, minimizes energy consumption, and achieves significant savings. The RT520 offers 3 types of PI control:

1. For radiators (6 Cycles Per Hour - CPH)
2. For underfloor heating (3 CPH)
3. For electric heating (9 CPH)

Hysteresis

Hysteresis is the difference between the setpoint temperature and the temperature at which the boiler turns on. Use [UP ARROW] or [DOWN ARROW] to select the desired Hysteresis value, then press [SELECT] to confirm.

Optimum Start / Optimum Stop

Optimum Start is a selectable function that, based on the room's ambient temperature, will start the boiler operation at the optimal time to reach the setpoint temperature, saving energy by running the boiler for the minimum required time. Optimum Stop calculates the house's cooling down time and switches off the boiler as early as possible, preventing unnecessary operation. If sudden heat loss occurs during Optimum Stop, it will be cancelled to restore comfort.

Setup Steps:

1. Press [SELECT].
2. Use [UP ARROW] or [DOWN ARROW], select ON or OFF for Optimum Start/Stop, then press [SELECT] to confirm.
3. The thermostat will return to the main screen.

Programming - Automatic Mode

This mode allows for 6 time intervals per day, each with a different settable temperature. You can configure 2, 3, or up to 6 temperatures per day. Users can define thermostat schedules (temperature setpoints for specific time periods).

Programming Steps:

1. Press [MENU].
2. Press [SELECT].
3. Use [UP ARROW] or [DOWN ARROW], select the program type:
• +2: Program for weekdays and weekends.
• All: Program for the entire week.
• Daily: Daily program.
4. Press [SELECT] to confirm.
5. Use [UP ARROW] or [DOWN ARROW], set the hour for the interval, then press [SELECT].
6. Use [UP ARROW] or [DOWN ARROW], set the minutes, then press [SELECT].
7. Use [UP ARROW] or [DOWN ARROW], select the setpoint temperature, then press [SELECT].
8. Repeat the process for all desired periods.

Deleting Temperature Intervals:

If you do not wish to use all 6 temperature intervals per day (e.g., 1 eco, 2 comfort), you can delete unwanted intervals. Press [UP ARROW] on the interval you wish to delete the temperature from, until lines appear. When lines appear, press [SELECT] to confirm the deleted temperature interval.

Example Weekly Program:

• 6 temps/day: 06:00 - 21°C, 10:00 - 14°C, 12:00 - 21°C, 14:00 - 14°C, 18:00 - 21°C, 21:00 - 14°C.
• 2 temps/day: 06:00 - 21°C, 14:00 - 14°C.

A high temperature should be used for 'on' periods and a low temperature for 'off' periods.

Owner Settings

Owner settings are a PIN-protected feature allowing the owner to set a service reminder on the thermostat. This will alert the tenant when the boiler requires annual servicing. The owner can also set a lock temperature to prevent unauthorized changes.

Setup Steps:

1. Press [MENU].
2. Use [UP ARROW] or [DOWN ARROW] to access the owner submenu, then press [SELECT].
3. Use [UP ARROW] or [DOWN ARROW], enter the PIN number. Press [SELECT] to confirm each digit.
4. Use [UP ARROW] or [DOWN ARROW], select the warning period (service reminder interval), then press [SELECT].
5. Use [UP ARROW] or [DOWN ARROW], select the lock temperature, then press [SELECT].
6. Use [UP ARROW] or [DOWN ARROW], enter the phone number for service contact, then press [SELECT] to confirm each digit.
7. Use [UP ARROW] or [DOWN ARROW], select ON or OFF to enable/disable the owner settings lock, then press [SELECT] to confirm.

Once owner mode is activated, the device locks the setpoint temperature defined by the installer/owner. To unlock, the owner must be contacted and the boiler serviced.

Pairing RT520TX Thermostat with Receiver

If you are using the RT520RF pack, the thermostat and receiver are pre-paired at the factory. Ensure the thermostat and receiver are at least 1 meter apart during the pairing procedure.

If you purchased the RT520TX and RXRT520 separately or need to re-pair them:

1. Ensure the unit is unplugged from the power supply and the receiver switches are set to AUTO and ON.
2. Plug in the receiver and wait for the red LED to light up.
3. Quickly switch the receiver to OFF and then back to ON. The flashing red LED will confirm entry into pairing mode.
4. Press [MENU] on the thermostat.
5. Use [UP ARROW] or [DOWN ARROW] to access the Pairing submenu, then press [SELECT].
6. Use [UP ARROW] or [DOWN ARROW], select Pairing, then press [SELECT].

Once the devices are paired, the receiver's LED will turn solid red. The pairing process can take up to 10 minutes.

Test Pairing Process

1. Ensure the receiver is in AUTO mode.
2. Press [MENU] on the thermostat.
3. Use [UP ARROW] or [DOWN ARROW] to access the Pairing submenu, then press [SELECT].
4. Use [UP ARROW] or [DOWN ARROW], select Test, then press [SELECT].

The receiver's red and green LEDs will start flashing. The test process can take up to 10 minutes. Once successful, the receiver LED will turn solid red.

Factory Reset

1. To reset the thermostat, press and hold [MENU], [DOWN ARROW], and [+HR] simultaneously for 5 seconds.
2. The unit will reset and start automatically.

Note: Owner settings will not be reset during a factory reset.

Contact Information

For technical support, email: technicalsupport@saluscontrols.fr

Head Office: SALUS Controls, Units 8-10 Northfield Business Park, Forge Way, Parkgate, Rotherham S60 1SD

Email: sales@salus-tech.com

Website: www.salus-controls.com

SALUS Controls is a member of the Computime Group.

SALUS Controls plc reserves the right to modify the specifications, design, and materials of the products listed in this brochure without prior notice, as part of its continuous product development policy.

For the installation guide in PDF format, please visit www.salus-controls.com.

Date of Issue: July 2021 V015