10
COMMISSIONING AND MAINTENANCE
COMMISSIONING AND MAINTENANCE
9
If copper piping has been used and joints have been hot
brazed, flush out the system to remove any brazing resi-
dues. Seal test the system after you have flushed it out.
9
The solar circuit must be immediately filled with a mixture
of water and glycol, that avoids freezing and corrosion.
15
SYSTEM FILLING COCK
Before filling the system:
− Cut power off to the solar station and to the connected
integration system, by setting the system's main switch
and the device's main switch to OFF
9
Always use a mixture of water and glycol suitable for solar
applications. Choose the mixture according to the minimum
temperature that can be reached at the installation site and
to the maximum service temperature of solar collectors. For
further information, please refer to the glycol safety data
sheet.
When using glycol not pre-mixed:
− Do NOT part fill the circuit with pure glycol then add water
later.
− Ensure that filling water characteristics comply with pre-
vailing regulations; if that is not so, filling water must be
treated. Use portable treatment systems, for instance. In
particular, when chlorine content is very high (> 50ppm)
you must use distilled water for the mixture.
Mixture
of glycol
and water
1
2
3
4
5
0
6
B
A
VM
VR
PC
PC
Heat transfer fluid filling pump
To fill the system, proceed as follows:
− Connect the filling pump (PC) as shown
− Turn handle on valve (VR) clockwise
Open taps (A) and (B) on the return tube
− Open manual degassing tap and any bleeder valve, lo-
cated at the highest points of the system, and keep them
open throughout the filling procedure.
− Pump the heat transfer fluid around the circuit with an
external filling pump until all air bubbles have been
eliminated. Close the manual bleed valve and any vent
valves opened previously.
− Turn handle on valve (VR) counter clockwise
− Temporarily raise the pressure in the system to 4 bar.
− Start up the system for about 20 minutes.
− Repeat air bleeding operation until system is completely
free of air bubbles.
− set the system pressure.
− Close taps (A) and (B).
9
The set pressure must ensure that the one measured at the
solar collectors is positive with respect to the ambient one
(avoid depression in the solar field) and must be set con-
sidering both the safety valve opening pressure (6) and the
solar expansion reservoir pre-charge pressure. To set the
system pressure correctly, refer to the design manual.
0
Do not fill the system in bright, sunny conditions or if the
collectors are hot.
9
Use a manual bleed valve, which should be installed at the
highest point in the system, to ensure that all air bubbles
have been eliminated from the circuit.