Inhaltsverzeichnis
Werbung
Verfügbare Sprachen
Verfügbare Sprachen
General Instructions
6. Flow Diagrams
Filling curves
Fast filling
Refilling
∆p (bar)
Fast filling
Refilling
The flow rate and therefore the filling time for
fast filling are dependent on the position of
the ball valve lever.
Refilling
∆p (bar)
Fast filling
Refilling
At the end of the filling operation the position
of the ballvalve lever should be set to "Refill".
An interlock prevents the appliance from
being closed if the lever is not in the "Refill"
position.
The refill volume can be checked by
comparing the before and after water meter
readings.
20
7. Method of Operation
5
If the system pressure falls to below the lower set value, for example through leakage losses,
then an electrical impulse from the level switch 13 opens the changeover valve 3 and
thereby permits fluid flow to the backflow preventer. The inlet pressure moves the backflow
preventer 5 to the flow position and the system is refilled until the level rises to the set upper
limit. The time period of the refill is controlled by the time relay 10 . Once the upper limit has
been reached, the level switch 13 closes the changeover valve 3 and the backflow
preventer goes to the shutoff position (open to atmosphere). The time relay then returns to the
outlet position.
If the inlet pressure falls to the operating pressure of the backflow preventer during the
automatic refilling operation, then the backflow preventer automatically goes to the shutoff
position (open to atmosphere). The shutoff position of the backflow preventer is indicated
in the viewing window (green visible = shutoff position)
General Instructions
10
13
3
A1
11
15
C
MAX MIN
ENS
mecotron
A1
A2
12
11
14
Sens.k
B1
B2 B3
R
U
14
18
12
16
A2
21
Werbung
Inhaltsverzeichnis
