SALUS RT520, RT520TX, RT520RF Thermostats - 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.

Please read this guide carefully before use.

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.

RF Frequency: 868.0-868.6MHz; <13dBm

Safety Information

Use in accordance with national and EU regulations. Use the device as intended, keeping it in a 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

Thermostat Specifications

Receiver Specifications (RXRT520)

Button Functions

RT520/RT520RF Thermostat Buttons

• 1. MENU [⚙️]: Enter menu options, press and hold for 3 sec to return to main screen or to deactivate Boost Mode.
• 2. SELECT [✅]: Confirm changes and enter menus.
• 3. DOWN [⬇️]: Decrease temperature and move through menus.
• 4. UP [⬆️]: Increase temperature and move through menus.
• 5. BOOST [⚡]: Activate Boost Mode.
• 6. MANUAL [✋]: Activate/deactivate Manual Mode.

RXRT520 Receiver Buttons

• 7. ON [▶️]: When in Manual Mode, turns the boiler ON.
• 8. OFF [⏹️]: When in Manual Mode, turns the boiler OFF.
• 9. AUTO [?]: Receiver operates in automatic mode according to the thermostat.
• 10. MANUAL: Receiver output is controlled by the On/Off slide switch.

LCD Icon Description

• 1. Text Bar
• 2. Temperature Unit (°C)
• 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 Description

Wiring Diagrams

RT520TX Thermostat Wiring Diagram: Shows connections for TPI, SPAN, and OPENTHERM between the RT520TX thermostat and the RXRT520 receiver, including AC 230V supply to the receiver.

RT520 Wiring Diagram: Illustrates connections for TPI, SPAN, and OPENTHERM for the RT520 thermostat, connecting to the RXRT520 receiver.

OpenTherm Power Up and Configuration

OpenTherm Modulating Control is a method of control used by modern heating systems. Instead of switching a boiler on and off at intervals, modulating control allows the amount of heat provided by the boiler to be controlled to match the varying demand from the thermostat. This means the customer has greater system efficiency, energy saving, and room comfort from our heating controls.

Procedure:

1. Please make the receiver connections and power the receiver before inserting the batteries into the thermostat.
2. After inserting the batteries, the thermostat will power up.
3. Press [SELECT] to confirm.
4. Using [UP] or [DOWN], choose your language and then press [SELECT].
5. Using [UP] or [DOWN], choose the time format and press [SELECT].
6. Using [UP] or [DOWN], set the hour and then press [SELECT].
7. Using [UP] or [DOWN], set the minutes and then press [SELECT].
8. Using [UP] or [DOWN], set the year and then press [SELECT].
9. Using [UP] or [DOWN], set the month and then press [SELECT].
10. Using [UP] or [DOWN], set the day and then press [SELECT].
11. Using [UP] or [DOWN], select the week format and press [SELECT].
12. Using [UP] or [DOWN], enable or disable DST (Daylight Saving Time) [☀️]/[?] and press [SELECT].
13. Using [UP] or [DOWN], select your temperature accuracy and press [SELECT].

When OpenTherm is connected, the device software will automatically adjust to the OpenTherm settings.

OpenTherm - Hot Water

Procedure:

1. Press [MENU].
2. Using [UP] or [DOWN], navigate to the Hot Water submenu and press [SELECT].
3. Using [UP] or [DOWN], adjust the temperature and then press [SELECT].

The thermostat will return to the main screen. Press any button. The text bar indicates that hot water is in operation.

Standard Power Up and Configuration

Please follow steps 1 to 17 from section OpenTherm Power Up and Configuration.

Note: Using [UP] or [DOWN], you can choose either TPI (step 2) or SPAN (step 6). Choosing one option excludes the other.

TPI (Time Proportional & Integral)

TPI is a self-learning, time-proportional algorithm. TPI type of regulation ensures economical system operation through more accurate temperature maintenance during the controlling process and limits overload conditions. In addition to exact and stable room temperature, the advantage of this system is the minimization of energy consumption and significant savings. RT520 offers 3 types of TPI control: 1. for radiator (6CPH); 2. for underfloor heating (3CPH); 3. for electric heating (9CPH).

1. Press [SELECT].
2. Using [UP] or [DOWN], select the TPI type you want to use and press [SELECT].

SPAN

Span is the difference between the measured temperature and the set temperature. Using [UP] or [DOWN], select the Span value and press [SELECT].

Optimum Start/Stop

Optimum Start [?]: A selectable function which, depending on the ambient room temperature, will start the boiler operation at the optimum time to achieve the set-point temperature. It saves energy by only firing the boiler for the minimum required time.

Optimum Stop [?]: Calculates how long the house will take to cool down, then turns off the boiler at the earliest possible moment, meaning the system is not running when it's not actually necessary. If there is a sudden heat loss during this period, then Optimum Stop will be overridden to regain comfort conditions.

Programming - Automatic Mode

In this mode, the user can set schedules for the thermostat (temperature setpoints for specific periods of time). Programmed schedules should use all time periods.

1. Press [SELECT].
2. Using [UP] or [DOWN], select the program type between:
   • +2 (schedule for the working days and for the weekend)
   • All (set one schedule for the entire week)
   • Individual (set a daily schedule). Press [SELECT] to confirm.
3. Repeat the process for all time periods.

RT520TX Thermostat Pairing with the Receiver

If you are using the RT520RF pack, the pairing between the thermostat and the receiver is already done. During the pairing process, please make sure the thermostat and the receiver are at least 1 meter from each other.

If you bought the RT520TX and RXRT520 separately or if you want to re-pair the thermostat with the receiver, make sure that the device is disconnected from the power supply and the switches on the receiver have been set to AUTO [?] and ON [▶️]. Then connect the receiver to the power supply and wait for the red LED to light steadily. Then switch to the OFF [⏹️] position and again to ON [▶️] position quickly. The red flashing LED will confirm entering the pairing mode.

Procedure:

1. Press [MENU].
2. Using [UP] or [DOWN], navigate to the Pairing submenu [?] and press [SELECT].
3. Using [UP] or [DOWN], select PAIR [?] and press [SELECT].

The pairing process takes up to 10 minutes. Once devices are successfully paired, the LED on the receiver will go solid red.

Test the Pairing Process

1. Press [MENU].
2. Using [UP] or [DOWN], navigate to the Pairing submenu [?] and press [SELECT].
3. Using [UP] or [DOWN], select TEST [?] and press [SELECT].

The testing process takes up to 10 minutes. The red LED and the green LED on the receiver will begin to flash.

Landlord Settings [?]

Landlord settings is a PIN code [?] protected feature that allows the landlord to set a service reminder on the thermostat that will warn the tenant when the boiler is due its annual service.

1. Press [MENU].
2. Using [UP] or [DOWN], navigate to the Landlord submenu [?] and press [SELECT].
3. Using [UP] or [DOWN], enter the PIN code number [?]. Press [SELECT] to confirm every digit.
4. Using [UP] or [DOWN], select ON [▶️] or OFF [⏹️] and press [SELECT].
5. Using [UP] or [DOWN], select the warning period [⚠️] and then press [SELECT].
6. Using [UP] or [DOWN], select the lock temperature [?] and then press [SELECT].

Once service mode has become active, the device will lock the set point temperature as set by the installer/landlord. To unlock this device, the landlord needs to be contacted and the boiler serviced.

Factory Reset

1. To reset the thermostat, press [MENU], [DOWN] [⬇️], and [BOOST] [⚡] simultaneously for 5 seconds.
2. Landlord settings will not be reset.
3. The device will be reset and will start up automatically.

Company Information

SALUS Controls plc

Units 8-10, Northfield Business Park, Forge Way, Parkgate, Rotherham, S60 1SD

Email: sales@salus-tech.com

Website: www.salus-tech.com

SALUS Controls is a member of the Computime Group. Maintaining a policy of continuous product development, SALUS Controls plc reserves the right to change specification, design and materials of products listed in this brochure without prior notice.

For PDF Installation guide please go to www.salus-manuals.com

Issue Date: January 2020 V0012