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INSTALLATION
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 anti-freeze heat transfer liquid immediately after flushing it out, because flushing water may remain
trapped in the circuit (with a consequent risk of freezing).
9
The anti-freeze fluid supplied as an accessory has been specially formulated for use in solar applications, and maintains its
characteristics over its entire working life. The mix is also non-toxic, biodegradable and biocompatible.
9
Do NOT part fill the circuit with anti-freeze then top up with water.
9
Temperatures in excess of the specified working temperature can cause the anti freeze to break down. This is easily visible be-
cause the liquid becomes darker.
2 - FILLING
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
external filling pump until all air bubbles have been elimi-
nated. 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 at the boiler according to the table
below 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.
Heat exchanger
of solar storage
cylinder
H
up to 15 m
15 - 20 m
20 - 25 m
25 - 30 m
General rule: p [bar] = 1.5 + H [m] / 10
H
12
Manual bleed
valve (accessory)
Solar collectors
R
7
M
°C
A
Heat
transfer fluid
filling pump
Water control system
Anti-freeze mix
Pressure at boiler
3 bar
3,5 bar
4 bar
4,5 bar
M
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