SALUS Controls RT520/RT520RF Thermostats

Introduction

The RT520 (wired) and RT520RF (wireless) thermostats are new additions to the SALUS RT series. These thermostats incorporate all existing features of the RT series, along with new characteristics and properties to enhance efficiency and user comfort. Key features include a large LCD display, intuitive programming and settings, and additional operational functions. A significant advancement is the use of the OpenTherm protocol and the TPI (Time Proportional & Integral) algorithm, which optimize heating equipment performance by considering room characteristics.

Please read this manual carefully before use.

Safety Information

Use the equipment according to the instructions. Apply only indoors. This device must be installed by a competent specialist. Installation must comply with the manual, norms, and regulations applicable in the city, country, or state of installation. Failure to comply with relevant guides, standards, and rules may result in device damage, injury, death, or legal prosecution.

Compliance: The equipment complies with Directives: EMC 2014/30/EU, LVD 2014/35/EU, RED 2014/53/EU, and RoHS 2011/65/EU. Full Declaration of Conformity is available at www.saluslegal.com.

Radio Frequency: 868.0-868.6MHz; <13dBm

Technical Specifications

Thermostat Button Functions

The RT520/RT520RF thermostat features the following buttons:

• 1. MENU: Enter menu; press and hold for approx. 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: Activates Boost mode (temporary manual mode).
• 6. MANUAL: Activates/deactivates manual mode.

Receiver Functions

The RXRT520 receiver has manual control switches:

• ON: In manual mode, turns the boiler ON.
• OFF: In manual mode, turns the boiler OFF.
• AUTO: The receiver operates in automatic mode, according to commands sent by the thermostat.
• MANUAL: The receiver operates based on the position of the lower ON/OFF switch.

Wiring Diagrams and Connections

RT520/RT520TX Connection (Standard TPI/Hysteresis Modes):

This diagram illustrates the connection between the RT520 thermostat and the RXRT520 receiver. The RT520 has terminals labeled COM, NO, NC. The RXRT520 has terminals L, N, COM, NO. Connections are made from RT520 COM to RXRT520 COM, and RT520 NO to RXRT520 NO. The RT520 NC terminal is not used in this configuration. Power (230V AC) is supplied to the RXRT520's L and N terminals. The RT520TX transmitter is shown as a separate unit.

RT520 Connection (OpenTherm Mode):

This diagram shows the RT520 thermostat connected via its OpenTherm terminals (A and B) to the corresponding OpenTherm terminals (A and B) on the RXRT520 receiver. Power (230V AC) is supplied to the RXRT520's L and N terminals. The RT520TX transmitter is shown separately.

RT520TX Transmitter Connection to RT520 Thermostat:

This diagram depicts the RT520TX transmitter connected to the RT520 thermostat using terminals A and B, which facilitate OpenTherm communication. The RT520 thermostat also features COM, NO, and NC terminals.

RT520TX Transmitter Connection to RXRT520 Receiver:

This diagram shows the RT520TX transmitter connected to the RXRT520 receiver. The transmitter has terminals B and A, which connect to the receiver's terminals B and A respectively. The receiver also has terminals L, N, COM, and NO. Power (230V AC) is supplied to the receiver's L and N terminals.

Description of Screen Icons

The thermostat display shows various icons:

• 1: AM/PM indicator.
• 2: Day of the week (numeric display, e.g., 1 for Monday).
• 3A: Holiday Mode is active.
• 3B: Units of measurement displayed (e.g., °C).
• 4: Cooling Mode is active.
• 5: Day of the week (alphabetic display, e.g., MON).
• 6: Manual Mode is active.
• 7: Current Time display.
• 8: Heating Mode is active.
• 9: Indicates a wireless connection with the receiver.
• 10: Displays the current Program Number.
• 11: Program Indicator, showing the active program segment.
• 12: Battery Status Indicator, showing remaining battery life.
• 13: Displays both the Measured and Set Temperatures.
• 14: Service Mode is active.
• 15: Indicates the thermostat is in the Settings menu.
• 16: Boost Mode is active.
• 17: An alternative Program Indicator.

Description of Electrical Terminals

RT520 Thermostat Terminals:

• B / A: OpenTherm Communication Wire.
• NC: Normally Closed Contact.
• NO: Normally Open Contact.
• COM: Common Contact.

RXRT520 Receiver Terminals:

• B / A: OpenTherm Communication Wire.
• NO: Normally Open Contact.
• COM: Common Contact.
• L; N: Power Supply (230V AC).

Initial Setup and Configuration

Important: Before installing batteries, connect the actuator unit and its power supply. Use 1.5V AA alkaline batteries only. Do not use rechargeable batteries.

1. Install batteries into the thermostat. The thermostat will power on automatically.
2. Language Selection: Use the DOWN/UP buttons to select your preferred language, then press SELECT to confirm.
3. Time Setup (Hour): Use the DOWN/UP buttons to set the current hour, then press SELECT.
4. Time Setup (Minutes): Use the DOWN/UP buttons to set the current minutes, then press SELECT.
5. Year Setup: Use the DOWN/UP buttons to set the current year, then press SELECT.
6. Month Setup: Use the DOWN/UP buttons to set the current month, then press SELECT.
7. Day Setup: Use the DOWN/UP buttons to set the current day, then press SELECT.
8. Time Format: Use the DOWN/UP buttons to select the time format (12-hour or 24-hour), then press SELECT to confirm.
9. Day of Week Format: Use the DOWN/UP buttons to select the display format for the day of the week, then press SELECT to confirm.
10. Temperature Display Step: Use the DOWN/UP buttons to set the temperature display step (0.1°C or 0.5°C), then press SELECT to confirm.
11. DST (Daylight Saving Time): Use the DOWN/UP buttons to enable or disable DST, then press SELECT to confirm.
12. OpenTherm Detection: If the thermostat was connected using the OpenTherm terminal, the software will automatically adapt to OpenTherm settings. Press SELECT to confirm.

Standard Connection and Settings

Follow steps 1 through 17 from the "Wiring Diagrams and Connections" section. Subsequently, you can choose between TPI or Hysteresis control and configure the settings for each type of connection.

IMPORTANT: Use the DOWN or UP buttons to select TPI (step 2) or HYSTERESIS (step 6). Selecting one option excludes the other.

TPI (Time Proportional & Integral) Control

TPI is a self-learning proportional temperature control algorithm that allows for faster and more accurate achievement of the set temperature for a given time, taking into account the specific characteristics of each room. Due to precise maintenance of the set temperature, this algorithm also minimizes energy consumption and significantly reduces costs. The RT520 thermostat offers 3 types of TPI control:

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

Optimal Stop: This is an additional intelligent function that continuously compares the current and set temperatures, calculating how long the heating will continue after the load is switched off, and switches off the load in advance. As this function operates constantly and in real-time, its parameters will automatically adjust in case of unexpected heat loss in the room, preventing room overcooling.

Optimal Start: This is an additional intelligent function that compares the current and set temperatures, switching on the load at the most optimal time to reach the set temperature precisely according to the schedule. This function saves energy by activating the load only when truly necessary and provides additional user comfort by strictly adhering to the schedule.

Hysteresis: Hysteresis is the difference between the temperature at which the load connected to the thermostat turns on and turns off. For example, if you set the room temperature to 20°C and the hysteresis to 0.5°C, the load will turn on when the temperature drops to 19.75°C and turn off when it rises to 20.25°C.

Programming - Auto Mode

In this mode, the user can create custom programming settings for the thermostat, defining set temperatures for specific time periods. Remember to utilize all time periods.

Programming Options:

• +2: Separate schedules for weekdays and weekends.
• All days same: One schedule for all days of the week.
• Each day individually: A unique schedule for each day.

Follow the on-screen prompts using the DOWN/UP buttons to set the desired temperatures and times for each program period. Press SELECT to confirm each setting.

Pairing RT520TX Transmitter with RXRT520 Receiver (for RT520RF models)

A. If you purchased an RT520RF kit: The devices are already paired with each other. Ensure the thermostat and receiver are within 1 meter of each other during pairing.

B. If you purchased the RT520TX transmitter and RXRT520 receiver separately: Follow the instructions below to pair the devices.

1. Ensure the actuator unit is disconnected from power and set to AUTO mode, position ON.
2. Connect power to the actuator unit; the red LED will start to glow constantly red.
3. Set the switch on the receiver to the OFF position, then immediately (without delay) switch it to the ON position. The red LED will start flashing, indicating the receiver is in pairing mode.
4. On the thermostat, press MENU, then use the DOWN or UP buttons to navigate to the PAIRING menu and press SELECT.
5. Select PAIRING and press SELECT.
6. The pairing process may take up to 10 minutes.
7. When the red and green LEDs on the receiver start flashing, the devices are successfully paired.

Test Pairing:

1. Press MENU, then use the DOWN or UP buttons to navigate to the TEST menu and press SELECT.
2. Select TEST and press SELECT.
3. The thermostat will return to the main menu.

Service Settings

Service settings (administrator settings) are protected by a PIN code and allow the heating system installer to configure alerts (displayed on the thermostat) for necessary boiler servicing.

1. Press MENU.
2. Use the DOWN or UP buttons to navigate to the ADMIN menu and press SELECT.
3. Use the DOWN or UP buttons to enter the PIN code, pressing SELECT to confirm each digit.
4. Use the DOWN or UP buttons to enter the service and installation company's phone number, pressing SELECT to confirm each digit.
5. Use the DOWN or UP buttons to select the time when the reminder should appear, then press SELECT.
6. Use the DOWN or UP buttons to set the temperature that will be maintained during thermostat lockout, then press SELECT.

Once the Service Mode is activated, the thermostat will be locked, but it will maintain the temperature set by the administrator/installer. To unlock the thermostat, the user must contact the installer for a boiler inspection.

Factory Reset

To reset all thermostat settings, press and hold the MENU, DOWN, and BOOST buttons simultaneously for approximately 5 seconds. The settings will be reset, and the thermostat will restart. Administrator settings will not be reset.

Company Information

Head Office:
SALUS Controls plc
SALUS House
Dodworth Business Park South,
Whinby Road, Dodworth,
Barnsley S75 3SP, UK.
T: +44 (0) 1226 323961
E: sales@salus-tech.com
E: techsupport@salus-tech.com

Regional Contacts:
RU: russia@salus-controls.eu
Tel: +7 (495) 773-09-45
UA: service.ukraine@salus-controls.eu
Tel: +38 (050) 010 81 31 ext: 902
BY: info@euroterm.by
Tel: +375 29 366 71 04

Website: www.salus-tech.com

SALUS Controls is part of Computime Group Limited. SALUS Controls plc continuously improves and modifies its products, therefore it reserves the right to change the specifications, design, and materials of the products listed in this instruction without prior notice.