The RT520 and RT520RF are the latest additions to SALUS’ tried and tested RT range of thermostat heating controls. With a new onboard 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 includes 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.
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 on www.saluslegal.com
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 to 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.
RT520 Thermostat | RT520TX Thermostat | |
Thermostat supply | 2 x AA alkaline batteries | 2 x AA alkaline batteries |
Thermostat rating max | 3 (1) A | – |
OpenTherm terminals | A / B | – |
Outputs | Voltage free NC / NO / COM terminals | – |
Temperature range | 5°C – 33.5°C | 5°C – 33.5°C |
Temperature accuracy | 0.1°C or 0.5°C | 0.1°C or 0.5°C |
ErP control class | V | V |
Radio frequency | – | 868 MHz |
Dimension [mm] | 118 x 95 x 26 [mm] | 118 x 95 x 26 [mm] |
RXRT520 Receiver | |
Receiver supply | 230 V AC |
Receiver rating max | 16 (5) A |
OpenTherm terminals | A / B |
Outputs | Voltage free NO / COM terminals |
Radio frequency | 868 MHz |
Dimension [mm] | 96 x 96 x 26 [mm] |
Terminal | Description |
B / A | OpenTherm Communication Wire |
NC | Switched Live OFF |
NO | Switched Live ON |
COM | Common Terminal |
RXRT520 Receiver Terminals Description
Terminal | Description |
B / A | OpenTherm Communication Wire |
NO | Switch Terminal |
COM | Common Switch Terminal |
L; N | Supply (230 V AC) |
RT520 Wiring Diagram
RT520TX Wiring Diagram
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. Please make the receiver connections and power the receiver before inserting the batteries into the thermostat.
The schedule has 6-time intervals for which different temperatures can be adjusted. You can set 2, 3 or up to 6 temperatures per day. You must define all time periods. Here is an example of setting a certain time with a certain temperature
Repeat the process for all time periods. If you do not want to use the 6 temperature intervals/day (ex: 1 eco, 2 comforts), please see below how to delete one or more intervals.
This is an example of your weekly schedule. The high temperature should be used for the ON times and the low temperature for the OFF times.
TIME: | 6 temp / day – eco – | 2 temp / day – comfort – |
06.00 | 21 °C | 21 °C |
10.00 | 14 °C | – |
12.00 | 21 °C | – |
14.00 | 14 °C | – |
18.00 | 21 °C | – |
21.00 | 14 °C | 14 °C |
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 for its annual service.
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.
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 repair 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 the ON position quickly. The red flashing LED will confirm entering the pairing mode.
Factory Reset
Landlord settings will not be reset.
SALUS Controls is a member of the Computime Group.
Maintaining a policy of continuous product development SALUS Controls plc reserve the right to change the specification, design, and materials of products listed in this brochure without prior notice. www.salus-tech.com
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SALUS RT520 THERMOSTAT Installation Guide
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SALUS RT520 THERMOSTAT User Manual
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