Dualsun SLL: how to wire? How to adjust the flow for a ISWH system?


As a reminder: ISWH means Individual Solar Water Heater.

As a reminder, (as summarized in this article) whatever your hardware, the steps to commission a pressurized system with Dualsun SPRING panels are as follows:

  • Filling with water

  • Glycol filling

  • Pressure adjustment

  • Flow adjustment

  • Setting the back-up


1 - Wiring the regulation

To activate and deactivate the solar pump (R1), the Dualsun SLL control calculates the temperature difference between :

  1. the panel temperature sensor S1 

  2. the tank temperature sensor S2

S1 probe

The S1 probe (4 mm) is supplied with the essential kit, delivered with the Dualsun SPRING panels

Position of S1: in the exchanger hole at the outlet of the last panel


S2 probe

The S2 probe (6 mm) is supplied with the Dualsun SLL regulation 

Position of S2: at the bottom of the tank in a 6 mm thermowell 


S3 probe

If a KM2 T-Box has been ordered, S3 is supplied with the T-Box. 

Position of S3: at the top of the tank (6 mm thermowell probe)


Operation of the solar regulation in SSC mode

As soon as the temperature difference between S1 and S2 is greater than or equal to the set value for switching on the pump (R1), the pump is switched on and the storage tank is heated until its temperature reaches the set switch-off value or the maximum threshold.

  • DTO = 6 = Delta activation temperature (S1 - S2 )

  • DTF = 2 = Delta switch-off temperature (S1 - S2)

  • RNOM = 60 = Nominal tank temperature

  • R MAX = 80 = Maximum tank temperature


2- Flow regulation 

All our information are available on the manual page 39


You need therefore to set up the auxiliary heating.
For this you need to start to know when is it necessary to control the auxiliary heating with Dualsun solar controller?


> Back to the main article: How to carry out a hydraulic commissioning with Dualsun SPRING panels?