PANEL HANDBOOK aH72 SK
V 6.0
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4.7
Control system
There are many manufacturers of solar thermal controllers or regulators. Depending on the
configuration of the installation, the controller that guarantees the perfect operation of the installation
will be selected, taking into account that the simplest installation will include at least 2 temperature
sensors: one in the panel and another in the tank and 2 relays or control capacity: one for the circulator
pump and another for the heat sink (with 3-way valve or another pump).
The following figure shows a basic control scheme with S1, S2, R1 and R2 being mandatory parts in
any installation.
S1: Sensor to be inserted in the interior part of the panel
S2: Sensor inserted in the tank
R1: Control over 3-way valve and heatsink
R2: Control over circulation pump
Fig. 12.
Standard diagram of the control of the thermal part
4.8
Configuration and testing of the thermal system
Before filling the solar circuit, the tank must be flushed (cleaned) and filled according to the instructions
in the corresponding manual. To fill and empty the solar system, a dedicated discharge pump is
required.
There is a risk of burning caused by the hot fluid if there has been significant solar irradiation. For
safety reasons, the solar system should only be filled when the fluid is cold. This work should be done
by covering the panels completely and conveniently during the whole process.
It is necessary to initially flush the system with water, which can also be used for pressure testing.
S1
S2
R1
R2