Wilo Tagus Vac Notice De Montage Et De Mise En Service page 10

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3.2 Controller SCU
7
1 Control panel for the controller, graphical
display, LED for error display, selector switch
(click and roll)
2 P ower switch, ON: flashes red
3 Internal fuse F1: T 16 A 250 V
4 Internal fuse F2: T 3,5 A 250 V
5 H ardware release, service menu E2
A
6 Terminal bars for
B
• Electric supply;
• sensors;
C
• Impulse water counter;
• External activation for refilling process;
P
• Collective malfunction message;
D
• Pump.
7 Interface RS485.
E
3.3 Working principle
G
The automat serves primarily as an active
deaerating device. In addition as a make-up
device for re-filling the water losses in a
system.
16
1
2
3
4
5
6
P
3.3.1 Deaeration
A
B
C
P
D
E
G
For deaerating the water, the system water
is drawn in via a bypass from the return line
of the system (H). The water is run through
a flow regulator (G) and the strainer (F) into
the deaeration tank (C). It is subjected to
a vacuum during the cyclic running of the
pump (D) and passed through a ring packing
H
(E). As a result of the lowered pressure, and
the large surface of the ring packing, air
dissoleves from the water.
F
When the pump switches off, the
replenishing medium flowing into the tank
causes the pressure in the tank to increase
to the level of the system pressure so that
the air which has accumulated above the
water level is discharged via the vent. device
(A). While the pump is running, the water
quantity supplied into the tank is returned
via a bypass line to the return branch (B) of
the system.
• Fast deaeration mode (Fast = Turbo):
An interval during which the pump is run-
ning (vacuum is forming) alternates with an
interval during which the air is discharged
(pump is stopped).
• Normal deaeration mode:
An additional pause is added between
the end of the evacuation interval and
the starting of the pump. This additional
interval can be selected via a parameter
within fixed limits. Upon expiry of the
deaeration interval, the system changes
to the normal deaeration mode, which
then takes place continuously. The
H
F
P
WILO 07/2018