Are DualSun SPRING Panels compatible with Yack ORA thermodynamic water heater?


Yes, the DualSun SPRING hybrid panels can be coupled with the Yack ORA thermodynamic water heater (YORABTMHE200 & YORABTM270 models only).

For optimal coupling, it is recommended to schedule heating time slots by the thermodynamic group according to  the customer's consumption habits and solar heating hours as well as insure the communication between the solar system and the thermodynamic water heater.

Thermodynamic water heater programming

Temperature setpoint: 55 °C
Hysteresis: 5 °C
Base program: ECO with derivation of -15 °C

Time slots according to the customer’s heat water consumption: 

  • In the morning and the evening

  • Slot 1: 2 a.m. - 7 a.m. = NORMAL mode

    • Slot 2: 2 p.m. - 6 p.m. = NORMAL mode

  • In the evening only 

  • Slot 1: 2 p.m. - 5 p.m. = NORMAL mode

    • Slot 2: 5 p.m. - 6 p.m. = CONFORT+ mode

  • In the morning only

  • Slot 1: 12 a.m. - 7 a.m. = NORMAL mode




Wiring between the solar regulation and the thermodynamic water heater

The communication between the DualSun SLL solar controller and the Yack ORA thermodynamic water heater controller is possible to intelligently activate the compressor according to the solar energy.

For this purpose, the relay R2 of the SLL controller must be wired to terminal block B1 B2 of the Yack ORA water heater dedicated to the external source: 


In DualSun SLL controller, set R2 using the parallel relay option: 

  • OPARR = ON

  • Parallel relay: REL = R2

  • Reference relay: RELR = R1


In the Yack water heater controller, assign the function "OFF" to the external input (green "ON/OFF" symbol with waves), see of the storage tank manual.




The slot for inserting the storage tank temperature sensor, which is connected to terminal strip S2 of the DualSun SLL solar controller, is located at marker (10) in the diagram below.

Lower the temperature sensor as far as possible in order to collect the lowest possible storage tank temperature and thus optimize the solar control system.