Wilo Wilo-Control EC-L, Installation And Operating Instructions Manual

Page: 68 / 264

en Installation
68 WILO SE 2018-12
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54
55 56 57 58 59 60
10
Fig. 12: Pressure connection
10 Dynamic pressure bell, pressure connection
NOTICE! The use of a bubbling-through system is recommended for the optimal
venting of the dynamic pressure bell.
1. Loosen and unscrew the union nut from the pressure connection.
2. Insert a union nut on the pressure hose of the dynamic pressure bell
3. Push the pressure hose onto the pressure connection as far as it will go.
4. Screw the union nut back onto the pressure connection and tighten it to fasten the
pressure hose.
6.5.7 Connection of the NW16 level
monitor
NOTICE
Do not apply external voltage!
An external voltage which is applied destroys the component.
The level detection for two pumps can be performed using the NW16 level monitor.
The level monitor has the following switching points:
29 28 31 33 34
P1 P2
ON / OFF ON
bk bn bk gy (bu) gn-y
e
bn
Fig. 13: Connection diagram NW16 at the con-
trol EC-L 2x...
▪ Pump 1 On/Off
▪ Pump 2 On/Off
▪ High water alarm
The level control corresponds to operation with separate float switches. The internal
structure of the level monitor ensures hysteresis between the activation/deactivation
level of the relevant pump.
Insert the connection cable laid by the customer through the threaded cable connec-
tions and secure. Connect the wires to the terminal strip according to the connection
diagram.
DANGER! Risk of explosion due to incorrect connection! The level monitor may not
be installed in potentially explosive atmospheres!
6.5.8 Connection dry-running protec-
tion/min. Water level with separ-
ate float switch
NOTICE
Do not apply external voltage!
An external voltage which is applied destroys the component.
Dry-running protection (“drain” operating mode)
!
Fig. 14: Overview of connection symbol
The dry-running level can also be monitored by a float switch:
▪ Open: Dry run
▪ Closed: No dry run
The terminals are fitted with a converter bridge at the factory.
NOTICE! A separate dry-running protection system is recommended as an additional
system safety measure.
Insert the connection cable laid by the customer through the threaded cable connec-
tions and secure. Remove the converter bridge and connect the wires to the terminal
strip according to the connection diagram.
For details on the terminal number, see the
overview of connections in the cover.
DANGER! Risk of explosion due to incorrect connection! If the connected float
switch is used in potentially explosive atmospheres, observe the potentially explos-
ive atmospheres section in the appendix!