26
TECHNICAL ASSISTANCE CENTRE
12 INITIAL STARTUP
FILLING THE SYSTEM
a
Do not fill the system in bright, sunny conditions or if
the collectors are hot.
1 Turn the knobs of the outlet and return valves (M) and
(R) fully anti-clockwise.
Close the flow regulator (V) (so that the screw slot is
horizontal).
2 Open the manual bleed valve and any vent valves at
the highest point in the system and keep them open
throughout the filling operation.
- 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.
- Temporarily raise the pressure in the system to 4 bar.
- Start up the system for about 20 minutes.
- Bleed the circuit again from step 2 until all the air has
been removed.
- 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.
- Close the cocks (A) and (B) and re-open the flow
regulator (V).
b
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.
H
H
Pressure at boiler
up to 15 m
3 bar
15 - 20 m
3,5 bar
20 - 25 m
4 bar
25 - 30 m
4,5 bar
General rule: p [bar] = 1.5 + H [m] / 10
Upward
flow only
(non-return
valve function)
Position of the knob
of the valve R - M
90°
0°
90°
Flow stopped
0°
Anti-freeze mix
R
M
Pump
Heat
transfer
fluid filling
pump
A
B
V
Outlet
group
Return
group
Technical Assistance Centre
