SALUS RT520, RT520TX, RT520RF Thermostat User Guide
Product Series: RT520, RT520TX, RT520RF
Brand: SALUS
Introduction
This document provides comprehensive information for the SALUS RT520, RT520TX, and RT520RF series of thermostats. These devices are designed for intelligent heating control, offering features like LCD displays, OpenTherm communication, and advanced TPI (Time Proportional & Integral) control algorithms to optimize comfort and energy efficiency.
Key Features
- Clear LCD display for easy readability.
- OpenTherm compatibility for advanced boiler communication.
- TPI control algorithm for precise temperature regulation.
- Multiple TPI cycles (3, 6, 9 CPH) for customization.
- Frost protection to prevent freezing in heating systems.
- User-friendly interface with dedicated buttons.
- Wireless communication for RT520RF and RT520TX models.
Specifications
| Model | Power Source | Temperature Range | Temperature Resolution | Dimensions (W x H x D) | Wireless Frequency | Max Load (for RXRT520) |
|---|---|---|---|---|---|---|
| RT520 / RT520RF | 2 x AA 1.5V Batteries | 5°C – 33.5°C | 0.1°C / 0.5°C | 118 x 95 x 26 mm | 868 MHz | N/A |
| RT520TX | 2 x AA 1.5V Batteries | 5°C – 33.5°C | 0.1°C / 0.5°C | 118 x 95 x 26 mm | 868 MHz | N/A |
| RXRT520 (Receiver) | 230V AC | N/A | N/A | 96 x 96 x 26 mm | 868 MHz | 16(5)A |
Certifications: EMC 2014/30/EU, LVD 2014/35/EU, RED 2014/53/EU, RoHS 2011/65/EU.
RF Power: 868.0-868.6MHz; <13dBm.
Installation and Wiring
This section details the wiring connections for the SALUS thermostat system. Ensure all power is disconnected before proceeding with installation.
RT520 / RT520RF Wiring Diagram Description
The RT520/RT520RF thermostat typically connects to the heating system via terminals labeled COM, NO (Normally Open), and NC (Normally Closed). It also supports OpenTherm communication. The diagram shows connections for:
- N, L: Mains power input (230V AC) for the receiver unit (if applicable, or for wired thermostats).
- COM: Common terminal.
- NO: Normally Open terminal. Connects to the heating system load (e.g., boiler, zone valve).
- NC: Normally Closed terminal. Used for specific system configurations.
- OpenTherm A/B: Terminals for connecting to an OpenTherm compatible boiler.
Diagram Description: A wiring diagram illustrates the RT520/RT520RF thermostat with terminals COM, NO, NC, and OpenTherm A/B. It shows connections for mains power (N, L) to the receiver unit (RXRT520) and then to the thermostat's control terminals. The diagram also depicts the OpenTherm connection between the thermostat and the boiler.
RT520TX Wiring Diagram Description
The RT520TX is a wireless transmitter. Its wiring typically involves connecting to the receiver unit (RXRT520). The diagram shows:
- N, L: Mains power input (230V AC) for the receiver unit (RXRT520).
- COM, NO, NC: Control terminals on the receiver unit (RXRT520) that connect to the boiler or heating system.
- OpenTherm A/B: Terminals on the receiver unit (RXRT520) for connecting to an OpenTherm compatible boiler.
Diagram Description: A wiring diagram shows the RT520TX transmitter communicating wirelessly with the RXRT520 receiver. The RXRT520 receiver has terminals N, L for mains power, and COM, NO, NC for controlling the heating system. It also features OpenTherm A/B terminals for boiler communication. The diagram illustrates how the receiver unit is wired into the heating system.
RXRT520 Receiver Wiring Diagram Description
The RXRT520 is the receiver unit that connects directly to the heating system and boiler. It receives signals wirelessly from the RT520TX or RT520RF. The diagram shows:
- N, L: Mains power input (230V AC) for the receiver.
- COM, NO, NC: Control terminals for the heating system. Typically, COM and NO are used to switch the boiler on/off.
- OpenTherm A/B: Terminals for connecting to an OpenTherm compatible boiler.
Diagram Description: A detailed wiring diagram for the RXRT520 receiver unit. It shows connections for 230V AC mains power (N, L). It also shows the control terminals COM, NO, NC for switching the heating load, and OpenTherm A/B terminals for communication with the boiler. The diagram indicates how these terminals connect to the boiler's control circuit.
System Wiring Examples
The document provides several wiring examples for different configurations:
- RT520/RT520RF to Boiler: Direct wiring of the thermostat to the boiler's low-voltage control terminals (COM, NO/NC).
- RT520TX/RT520RF with RXRT520 Receiver: Wireless communication between thermostat and receiver. The receiver is wired to the boiler.
- OpenTherm Connection: Wiring the OpenTherm terminals (A/B) on the thermostat or receiver to the corresponding terminals on an OpenTherm compatible boiler.
Diagram Descriptions: Multiple diagrams illustrate specific wiring scenarios. For instance, one shows the RT520 connected directly to a boiler's control terminals. Another shows the RT520TX communicating wirelessly with the RXRT520 receiver, which is then wired to the boiler. Diagrams also detail the OpenTherm connections, showing how terminals A and B on the thermostat/receiver link to the boiler's OpenTherm ports. Specific terminal labels like 'COM', 'NO', 'NC', 'N', 'L', 'A', 'B' are shown with example wire routing.
Operation and Controls
The thermostat features several buttons for operation:
- MENU: Accesses the main menu and settings.
- SELECT: Confirms selections and navigates through options.
- DOWN: Decreases values or scrolls down.
- UP: Increases values or scrolls up.
- BOOST: Activates a temporary boost mode for heating.
- MANUAL: Switches between automatic and manual modes.
- ON/OFF: Manual override for the heating system.
- AUTO: Returns the thermostat to its programmed schedule.
The display shows the current temperature, set temperature, operating mode (Auto, Manual, Off), and other status indicators.
TPI Control Explained
TPI (Time Proportional & Integral) control is an advanced algorithm that provides more accurate temperature regulation compared to simple on/off thermostats. It modulates the heating output over a cycle time to maintain the set temperature more precisely.
TPI Cycles Available:
- 6 CPH (Cycles Per Hour): Standard setting for balanced performance.
- 3 CPH (Cycles Per Hour): Slower cycling, suitable for systems with high thermal mass or for maximum energy saving.
- 9 CPH (Cycles Per Hour): Faster cycling, for systems requiring quicker response or tighter temperature control.
The thermostat uses the TPI algorithm to calculate the proportion of time the heating system should be on within each cycle to reach and maintain the target temperature, minimizing temperature swings.
Menu Navigation and Settings
Access the main menu by pressing the MENU button. Use UP and DOWN to navigate through options and SELECT to confirm. Common settings include:
- Temperature Calibration: Adjust the displayed temperature if it differs from the actual room temperature.
- Frost Protection: Set a minimum temperature to prevent the system from freezing.
- Backlight: Adjust backlight settings (e.g., always on, on with button press, off).
- TPI Settings: Select the desired CPH cycle (3, 6, or 9).
- Factory Reset: Restore the thermostat to its default settings.
- OpenTherm Settings: Configure OpenTherm communication parameters if applicable.
Diagram Descriptions: Several diagrams illustrate menu navigation. For example, one shows pressing MENU, then using UP/DOWN to highlight an option like 'TPI', and pressing SELECT to enter the TPI settings submenu. Another diagram might show adjusting the CPH value using UP/DOWN and confirming with SELECT. A diagram might also show the frost protection setting with a temperature slider or input field.
Troubleshooting
If you encounter issues, consult the following:
- No Power: Check battery installation (RT520/RT520TX/RT520RF) or mains power supply (RXRT520).
- Heating Not Turning On/Off: Verify wiring connections, especially COM, NO/NC terminals, and ensure the thermostat is in the correct mode (Auto/Manual). Check boiler status.
- Temperature Inaccurate: Allow the thermostat time to acclimatize. Check for drafts or heat sources affecting the sensor. Use temperature calibration if necessary.
- Wireless Connection Issues (RT520TX/RT520RF): Ensure the receiver (RXRT520) is powered and within range. Check battery levels in the transmitter. Try re-pairing the devices.
- OpenTherm Errors: Ensure correct OpenTherm wiring and that the boiler is compatible. Consult boiler manual.
Contact and Support
For further assistance, please contact the relevant support channels:
- Russia: russia@salus-controls.eu, +7 (495) 773-09-45
- Ukraine: service.ukraine@salus-controls.eu, +38 (050) 010 81 31
- Belarus: info@euroterm.by, +375 29 366 71 04
Importer: QL CONTROLS Sp. z o.o. Sp. k. ul. Rolna 4, 43-262 Kobielice
Producer: Salus Limited 6/F, Building 20E, Phase 3, Hong Kong Science Park, 20 Science Park East Avenue, Shatin, New Territories, Hong Kong
Manufacturer Address: SALUS Controls, Moscow, 107023, Shcherbakovskaya St., Bldg. 3, Lit. 1, Office 7, +7 (495) 773-09-45
Website: www.salus-controls.eu
Document Version: V012, Date: 06 2020
