Pressure & circulation in the panels

How to set up the calorimeter function on a Dualsun installation?
A panel temperature probe is provided in the Dualsun essential kit. This probe is to wire to the S1 terminal block of the solar controller.   The ...
What is the expansion volume of the heat exchanger of the SPRING panel and the DualQuickFit hose?
With its aluminum exchanger, the SPRING4 expansion is negligible. Therefore there is no sense to calculate it.  At +20°C the p olypropylene heat exc...
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 commis...
Can glycol be used to melt the snow on the panels?
From the panel's point of view, there is no cons to use the hydraulic circuit to melt the snow, within the limits of the operating temperatures of o...
What are the different pressure limits for a Dualsun installation?
The inflation pressure of the expansion tank (which is not always mandatory : Is it necessary to have an expansion tank with a Dualsun SPRING installa...
What are the components of the kit for pressurized systems?
For a pressurized individual solar water heater installation with Dualsun panels, the heating kit consists of: a Dualsun solar station delivered with:...
I’ve noticed a pressure variation on my Dualsun Spring installation, should I be worried?
The pressure in the solar circuit of Dualsun Spring installations will tend to drop during its first days/weeks of operation, until it stabilizes. Thi...
What are the advantages of Dualsun SLL controller over pressurized systems?
The DualSun SLL controller is specifically configured for DualSun panels in Solar Water Heating application with or without pool discharge.  Compact, ...
What is the maximum allowable flow rate of Dualsun panels?
To determine the maximum allowable flow rate of Dualsun Spring hybrid panels, we distinguish two types of installations: Direct pool systems Maximum a...
How to wire the Dualsun SLL solar controller for a ISWH pool discharge system?
To activate and deactivate the ISWH solar circulator (R1), the DualSun SLL controller calculates the temperature difference between : the panel temper...
What should I do with my solar system when going on vacation?
In the event of holidays (no demand for domestic hot water), there is no risk of letting the water stagnate in the Dualsun hybrid solar panels, thanks...
KSW-E regulation : how to wire? How to adjust the flow?
As a reminder, (as summarized in this article ) whatever your hardware, the steps to commission a pressurized system with DualSun SPRING panels are...
How to set the pressure during commissioning with the OEG control group or Thermador?
As a reminder, (as summarized in this article ) whatever your hardware, the steps to commission a pressurized system with Dualsun SPRING panels are...
What can I do if Dualsun SLL regulation display an error code or if the indicator light color changes?
SLL share its status through two ways (1) The screen (2) The light led in the center of the LightwheelⓇ.   The regulator has a multicolor light led d...
How to check the hydraulic flow rate of a Dualsun solar system?
Checking the hydraulic flow rate ensures that the Dualsun solar system is working properly. To do so, you have to operate the solar control and read t...
How to carry out a hydraulic commissioning with Dualsun SPRING panels?
Whatever your hardware, the steps for commissioning a pressurized system with Dualsun SPRING panels are as follows: Filling with water Glycol fillin...
ModVSol L regulation : how to wire? How to adjust the flow?
As a reminder, (as summarized in this article ) whatever your hardware, the steps to commission a pressurized system with Dualsun SPRING panels are...
CS/2 regulation: How to wire? How to adjust the flow?
As a reminder, (as summarized in this article ) whatever your hardware, the steps to commission a pressurized system with DualSun SPRING panels are...
Is the DualSun SPRING panel compatible with pool water?
It is important to distinguish between our two generations of SPRING currently available: The SPRING3 , with its polymer exchanger, sold from July 20...
Which heat transfer fluid should be used in a pressurized system?
For a pressurized installation, do not use water from the municipal distribution system, as it contains chlorine which causes corrosion of metals and ...
What is the recommended hydraulic operating flow for DualSun panels?
The proper throughput of an installation depends on the schema listed below. The lower the rated thermal load of a plant, the higher the flow rate. Th...
Is the DualSun Wave panel compatible with pool water?
The DualSun Wave panel is not directly compatible with pool water. In fact, the chlorination and saline ions present in pool water can have a detrimen...
What is the maximum operating pressure of the SPRING panels?
The maximum allowable operating pressure in DualSun SPRING4 panels is 6 bar. The maximum allowable operating pressure in DualSun SPRING3 panels is 1...
How can I check the watertightness of a system with panels in parallel?
For installations with Spring panels: in order to check the watertightness of the system without wasting heat transfer fluid, we recommend that you fi...
What happens if the solar hot water tank reaches its maximum temperature?
The solar circuit stops. Under the hottest conditions, the solar hot water tank can reach its maximum temperature (around 55°C to 60°C), known as the...
Is there a maximum recommended distance between the panels and the tank?
To minimize heat losses, it is recommended that you reduce not only the distance between the panels and the tank as much as possible, but also between...
What is the power of the pump included in a DualSun solar station?
The complete DualSun solar station (with DualSun SLL controller) is equipped with a WILO Yonos PARA ST 15/7-50/IPWM2 circulation pump. The power absor...
Why use a 6 bar valve if the maximum operating sensor pressure is 1.5 bar?
The maximum operating pressure of the hybrid DualSun Spring panel is 1.5 bar. It can be increased up to 2 bar during the filling phase only. A 6 bar s...
How to check and change the circulator and the controller on a solar station SLL?
The green LED on the side of the circulator indicates the presence of 230V voltage when it is flashing. If the LED is off, check the voltage at the ou...
How to control the electrical resistance of a hot water tank (relay or clock)? Is it necessary to have peak/off-peak operation?
Our SPRING hybrid solar panels are always accompanied by a secondary hot water heating system, which serves as a backup. This can be an electric resis...
Is it possible to install DualSun SPRING panels to replace old thermal solar panels?
Yes, it is quite possible to install DualSun SPRING panels instead of thermal sensors. However, there are two points to be aware of before installing...
What are the characteristics of the CALOP 30D heat transfer fluid?
This solution prevents the fluid from freezing down to an outside temperature of -23°C. CALOP 30D heat transfer fluid is a pre-diluted solution based...
How do I purge the solar circuit of a Spring panel?
Fill each line of panels separately by installing valves on the interline fittings in order to purge the air efficiently. Make sure that the pump is u...
What are the conditions of use of the SLL solar station?
The DualSun SLL solar station is equipped with a pump (also called circulator) and a 6 bar safety valve which are the 2 elements that define its maxim...
Is the DualSun Spring panel compatible with ethanol as an antifreeze fluid?
Ethanol is not recommended, even if the materials used in our design are compatible. Indeed, for optimal protection against frost outdoors, the conce...
What are the pressure drops of the DualSun Wave panel?
The pressure drop of the Wave panel is about 6000 Pa at a flow rate of 200 L/h, which corresponds to 0.6 mWC (meter of water column). To use the same ...
What is the maximum operating pressure of the Wave panel?
The maximum allowable operating pressure in the DualSun Wave panel is 2 bar . To guarantee their resistance to this pressure, all DualSun Wave panels...