
TABLE OF CONTENTS
1. Introduction...............................................................................................................................................................4
1.1 Product Compliance ......................................................................................................................................................................4
1.2 Safety Informations.......................................................................................................................................................................4
2. Product Overview .......................................................................................................................................................5
2.1 Example of boilers compatible with the OpenTherm OT+ 4.0 protocol..........................................................................................6
2.2 Montage........................................................................................................................................................................................7
2.3 Package content............................................................................................................................................................................7
2.4 Proper thermostat location ...........................................................................................................................................................7
3. RXRT520 receiver ........................................................................................................................................................8
3.1 Receiver’s switches description......................................................................................................................................................8
3.2 LED indications in the receiver.......................................................................................................................................................9
3.3Wall mounting of the receiver .....................................................................................................................................................10
3.4 Connection description................................................................................................................................................................11
I A - Boiler connection ........................................................................................................................................................11
I B - Pump /Valve connection.............................................................................................................................................11
4. Before you start (rst power up) ................................................................................................................................12
4.1 LCD icon description ....................................................................................................................................................................12
4.2 Button description.......................................................................................................................................................................12
4.3 First power up sequence and conguration.................................................................................................................................13
4.4 OpenTherm - HotWater conguration.........................................................................................................................................17
4.5 Max boiler temperature settings.................................................................................................................................................17
5. User settings ............................................................................................................................................................18
5.1 Manual mode..............................................................................................................................................................................18
5.2 Schedule mode - programming schedule....................................................................................................................................19
5.3 Switching between manual and schedule mode.........................................................................................................................20
5.4 BOOST mode - hourly temperature override (+Hr)......................................................................................................................21
5.5 Control and Heat/Cool settings....................................................................................................................................................22
5.6 OFFSET temperature calibration..................................................................................................................................................23
5.7 Landlord settings ........................................................................................................................................................................24
5.7.1 PIN code setting.........................................................................................................................................................24
5.7.2 Service reminder / notication setting.......................................................................................................................25
5.7.3 Maximum / Minimum setpoint temperature setting..................................................................................................27
5.7.4 Receiver’s operation setting .......................................................................................................................................28
5.8Time/Date ...................................................................................................................................................................................29
5.9 Holiday mode..............................................................................................................................................................................30
5.10 Language ..................................................................................................................................................................................31
6. RT520RF thermostat pairing with the receiver............................................................................................................32
7. Test the pairing process.............................................................................................................................................33
8. LOSTLINK monit ........................................................................................................................................................33
9. Factory Reset............................................................................................................................................................34
10. Error codes..............................................................................................................................................................34
11. Battery change .......................................................................................................................................................34
12. Cleaning and Maintenance ......................................................................................................................................35
13. Technical Informations ............................................................................................................................................35
14. Warranty ................................................................................................................................................................36