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Filling the circuit
9 FILLING THE CIRCUIT
Perform the following steps before starting up the system.
1 - FLUSHING AND SEAL TESTING THE SYSTEM
If copper piping has been used and joints have been hot brazed,
flush out the system to remove any brazing residues. Seal test
the system after you have flushed it out.
9
Fill the solar collector with glycol/water mix immediately
after flushing it out, because flushing water may remain
trapped in the circuit (with a consequent risk of freezing).
2 - PREMIXING WATER + GLYCOL
Glycol anti-freeze is supplied separately in standard volumes
and must be premixed with water in a suitable container before
being used to fill the system. For example, a mix of 40% glycol
and 60% water provides anti-freeze protection down to a tem-
perature of -21°C.
9
The propylene glycol supplied is specially formulated for solar
collector applications and remains fully efficient throughout
the -32 to +180°C temperature range. It is also non-toxic,
biodegradable and biocompatible.
9
Do NOT part fill the circuit with pure glycol then add water
later.
3 - FILLING
9
Only fill and bleed the solar circuit at ambient tempera-
ture, with the collectors shielded from the sun's rays.
1
Open the non-return valve (A)
2
Open the air vent at the highest point in the system (see
figure alongside) and keep it open throughout the filling
operation
3
Open the vent valve (7)
4
Pump the heat transfer fluid around the circuit with an ex-
ternal filling pump until all air bubbles have been eliminat-
ed. Close the manual bleed valve
5
Temporarily raise the pressure in the system to 4 bar
6
Start up the system for about 20 minutes
7
Bleed the circuit again from step 2 until all the air has been
removed
8
Set the circuit pressure according to the table on the next
page in order to ensure a minimum pressure of 1.5 bar at the
height of the collector field
9
Close the non-return valve (A) and any open vent valves to
prevent the heat transfer fluid from evaporating.
9
Make sure that you have bled all the air out of the system,
using the water control system vent too.
Heat transfer fluid filling pump (accessory). A manual bleed
valve is not required if this pump is used.
Anti-freeze
50%
40%
30%
Manual
bleed valve
(accessory)
°C
Heat exchanger
of solar
Water control system
9
Temperature
Density
-32 °C
1,045 kg/dm
-21 °C
1,037 kg/dm
-13 °C
1,029 kg/dm
Solar collector
M
R
7
M
T
A
Heat
transfer fluid
filling pump
Anti-freeze mix
3
3
3
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