Evolution Solar HFD
6
3.6
Installing the solar circuit
The solar circuit integrated in the boiler must be installed by qualified personnel. The solar circuit
basically consists of a dual-chamber domestic hot water storage tank, for exchanging heat with the
domestic hot water, one solar circulation pump, a flow regulator and a solar collector, for
exchanging heat with the sun.
To make optimum use of the solar energy, take special care when locating and positioning the solar
collector. Read the “Location of the Solar Collector” section carefully to obtain full performance
from the circuit. To correctly assemble the solar collector and its corresponding supports, carefully
follow the assembly instructions included with the same.
The hydraulic connection between the solar collector and the boiler is made using the solar inlet
socket "ES" and the solar return socket "RS" (see "Diagrams and Measurements"). On establishing
the solar circuit and the hydraulic connection between the solar collector and the boiler, the
following limitations must be taken into account:
Min. height
(G)
Max.
height
(H)
Max. horizontal L.
(flow and return)
(L)
Max. total
length
Min. slope (
α
)
Piping Ø
0.5 m.
10 m.
20 m.
40 m.
4%
Ø 12 mm.
See fig. A
When the solar circuit hydraulic connections have been made, fit the collector sensor bulb (Scol) to
the bulb-holder on the collector, and make the electrical connection on the terminal strip of
sensors J3, terminals 17 and 18 (see “Connection Diagram”). The collector sensor "Scol" is supplied
with the boiler, in the documents bag.
For the solar circuit to function properly, it is essential to start it up correctly, carefully following the
instructions given in the points on this subject in the “Start-up” section of this manual. These
sections provide a detailed description of how to correctly fill the circuit, control the seal and adjust
the flow.
The heat transmission in the
Evolution Solar HFD
boiler solar circuit is made by means of a heat-
carrying fluid consisting of a mix of water (70%) and
DOMUSA TEKNIK
inhibitor liquid (minimum
30%). The DOMUSA TEKNIK inhibitor liquid’s resistance and heat transmission properties make it
suitable for use in solar heating installations. Its main function is to protect the different
components from corrosion, as the installation contains various metals. The
Evolution Solar HFD
boiler is supplied pre-loaded with 8 litres of inhibitor liquid in the solar circuit of the hot water tank,
which means the optimum proportion of inhibitor liquid is reached when the circuit has been filled
(see “Filling the Solar Circuit").
IMPORTANT: The inhibitor liquid must always be mixed with water before use, as otherwise it
could damage the installation.
IMPORTANT: DOMUSA TEKNIK will only be liable for the correct functioning of the system if it
has been filled with DOMUSA TEKNIK inhibitor liquid.
IMPORTANT: Evolution Solar 30 HFD boilers are specifically designed to function with Ø12 mm
diameter tubes for the flow and return connection between the solar collector and
the hot water tank. If you wish to use any other diameter, consult the DOMUSA
TEKNIK customer service department.
