What materials are necessary to set up a thermal monitoring system in a DualSun installation?

At least two temperature probes are required for the correct operation of any DualSun installation:

  • one for the panels (panel probe),
  • one for the tank (storage tank probe for a DHW system or a pool probe for a swimming pool heating system).

The panel probe is supplied automatically with the panels in the essential kit.

Solar water heater installation (DHW):

The DualSun SLL solar controller is supplied with a storage tank probe, to be installed at the bottom of the storage tank and wired to the terminal strip S2 of the solar controller.

A modulated control signal controls the circulating pump of the solar station: this is done via a PWM cable.

The DualSun SLL solar controller enables a calorimetric balance thanks to the panel and storage tank probes and the calculation of the flow rate according to the PWM signal. 

  • Setting of the DualSun SLL solar controller:
    Long press on the confirmation button 
  • Go to the OCAL menu by turning the rotary actuator
  • Short press on validation button 
  • Activate the OCAL function by switching to ON
  • VART = 1
  • DMAX = maximum flow rate in L/min. Set with the commissioning setting flow rate, i.e. 1 L/min/panel, to be multiplied by the number of SPRING panels.
  • GELT = type of heat transfer fluid = 3
  • GELT% = glycol concentration = 40%.
  • SDCAL = flow sensor = S1
  • SRCAL = return sensor = S2

Swimming pool solar heating system:

The DualSun BS/2 solar controller is supplied with a temperature probe which must be installed at the surface of the pipe between the filtration pump and the sand filter and wired to the terminal strip S2 of the solar controller.

To carry out a calorimetric balance, an additional probe is to be installed between the mitigation tee and the pool water inlet. This probe must be wired to terminal block S4 of the solar control.

The DualSun BS/2 solar controller allows you to carry out a calorimetric balance by means of the panel probe (S1) and mitigation probe (S4) and by calculating the flow rate according to the manually set value as follows. 

Setting of the DualSun BS/2 solar control:

  • Multiple presses on the right-hand button and then long press 
  • Go to the OCAL menu 
  • Short press on the validation button in the middle
  • Activate the OCAL function by switching to ON
  • GELT = type of heat transfer fluid = 0
  • DMAX = maximum flow rate in L/min. Set with the commissioning setting flow rate, i.e. 3.33 L/min/panel, to be multiplied by the number of SPRING panels.

Remote thermal monitoring:

Real-time remote thermal monitoring is possible thanks to the DualSun T-Box and allows data to be displayed on your computer screen or smartphone.

An additional probe is delivered with the T-Box. It can be installed at the top of the storage tank in a DHW system or near the water inlet in a swimming pool heating system.

The T-Box also allows remote monitoring of the installation, facilitating any after-sales service and limiting the number of field interventions.

Please refer to the DualSun pressurized systems installation manual or the Pool installation manual for the key steps of a proper DHW or pool installation.

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