21
ENGLISH
FILLING THE CIRCUIT
Step 1
Turn the knobs of the outlet valve (M) and return valve (R)
fully anticlockwise.
Close the flow regulator (V) (by turning clockwise with a
6 mm Allen key).
Step 2
Open the manual bleed valve and any vent valves at the
highest point in the system and keep them open through-
out the filling operation.
Step 3
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 and any vent valves
opened previously.
Step 4
Temporarily raise the pressure in the system to 4 bar.
Step 5
Start up the system for about 20 minutes.
Step 6
Repeat the air bleed operation from step 2 on until all
residual air is eliminated from the circuit.
Step 7
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.
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
H
Step 8
Close the cocks (A) and (B) and re-open the flow regula-
tor (V) (by turning anticlockwise with a 6 mm Allen key).
b
Do not fill the system in bright, sunny conditions or
if the collectors are hot.
b
Use a manual bleed valve, which should be in-
stalled at the highest point in the system, to ensure
that all air bubbles have been eliminated from the
circuit.
Gruppo di
mandata
Gruppo di
ritorno
Posizione della maniglia della valvola
R
90°
Flusso bloccato
0°
Flusso solo verso l’alto
(funzione di valvola
di non ritorno)
M
R
A
B
V
G
Pompa
di carico
fluido
termovettore
Miscela antigelo
Outlet
group
Return
group
Anti-freeze mix
Position of the knob of the r
etur
n valve
R
Heat transfer
fluid filling
pump
Flow stopped
Upward flow only
(non-return
valve function)
Summary of Contents for Dialog Plus 300
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