Salus Controls ERT20RF Wireless Electronic Thermostat
Model: ERT20RF
Introduction
The ERT20RF is a wireless, electronic, and surface-mounted room thermostat designed to easily adjust room temperature. It activates the heating system via receiver contacts and indicates operation with a red LED diode (?) on the transmitter. For initial use, please read the manual carefully. The thermostat is powered by 2x AA alkaline batteries. The use of rechargeable batteries is prohibited.
Product Compliance
This product complies with the essential requirements and other relevant provisions of the EU Directives: 2014/30/EU, 2014/35/EU, 2011/65/EU. Operating frequency: 868.0 MHz - 868.6 MHz; <13dBm. The full text of the EU Declaration of Conformity is available at: www.saluslegal.com.
Safety Information
Use in accordance with national and EU regulations. Use the device as intended, keeping it in dry conditions. This product is for indoor use only. Installation must be carried out by a qualified person in accordance with national and EU regulations.
Technical Data
| Feature | Specification |
|---|---|
| Transmitter power supply | 2x AA alkaline batteries |
| Receiver power supply | 230 V AC 50 Hz |
| Receiver max load | 16 (5) A |
| Receiver output | Volt-free NO/COM relay |
| Setpoint temperature range | 5 - 32.5°C |
| RF signal frequency | 868 MHz |
Proper Thermostat Placement
For optimal performance, the thermostat should be mounted on an internal wall at a height of approximately 150 cm from the floor. Ensure it is at least 20 cm away from any corners or obstructions that might affect temperature readings.
Principle of Operation
The ERT20TX transmitter allows setting the desired room temperature using a control knob. When the heating mode is active, the thermostat's LED diode will turn red (?). The RXRT505 receiver features an ON/OFF switch and two indication diodes. The green diode (?) lights up when the receiver receives a signal from the transmitter indicating a heat demand. The red diode (?) lights up when the receiver is connected to the 230V AC power supply and the switch is in the ON position.
RXRT505 Receiver Terminals Description
| Terminal | Function |
|---|---|
| NO | Normal-open contact |
| COM | Common contact |
| L, N | 230 V AC power supply |
Wiring Diagram
⚠️ NOTE: Always isolate the AC Mains supply before installing or working on any components requiring a 230 V AC 50Hz supply. Installation should be performed by a qualified person with appropriate electrical permissions. Incorrect wiring can damage the device.
The wiring involves connecting the ERT20TX thermostat to the RXRT505 receiver. The receiver's terminals (L, N, COM, NO) are used to connect to the boiler's ON-OFF thermostat contacts. The diagram shows the receiver connected to a 230V AC power supply (L, N) and its relay output (NO, COM) wired to the boiler control circuit.
Communication Code Change
⚠️ NOTE: To prevent interference from other wireless devices, it is strongly recommended to change the communication code from the factory default.
- Communication code change is performed using DIP switches (numbered 1-5) located on the receiver. Set these DIP switches to random positions.
- Ensure the receiver's switch is set to the ON position; the receiver's red LED diode will start flashing.
Pairing Process
Follow these steps to pair the ERT20TX transmitter with the RXRT505 receiver:
- Press and hold the SYNC button on the back of the thermostat for 3 seconds. The thermostat's red LED diode will begin flashing.
- If the LED diode on the receiver stops flashing, the pairing process was successful.
- To finalize the pairing, press and hold the SYNC button on the thermostat again. The thermostat's LED diode will stop flashing.
- To verify successful pairing: set the thermostat knob to its maximum setting. The thermostat's red LED should light up, sending a heating signal. If the receiver's green LED (?) lights up, the devices are paired correctly.
Heating/Cooling Mode Changing
The ERT20RF thermostat is factory-set for heating mode. It can be switched to cooling mode to work with a cooling device. To change the mode, adjust the position of the jumper located on the back of the thermostat as illustrated.
Heating Mode: Jumper in default position.
Cooling Mode: Jumper moved to the alternative position.
