English
22
WILO SE 11/2013
6 Description and function
6.1
Switchbox description
The switchbox SK 601N provides a 24-hour time switch for the
time-dependent connection of Wilo heating and potable water
pumps of all series at pre-scheduled times. The time switch is
enclosed in a housing for wall-mounted installation with termi-
nals and terminal compartment for wiring. The cables are fed via
cable feedthroughs with screwed connections. The time switch
can be set under a transparent cover flap, which can be opened
from the outside.
6.2
Switchbox function
The electromechanical time switch switches the connected
phase to the mechanically set switching times. To save energy
on the timer, the neutral conductor is also required, in addition
to the switching phase. The timer has a battery backup for
100 hours. The ON and OFF switching times of the time switch
are mechanically set by switching the segments on the 24-hour
wheel. Switching times are possible in 15-minute intervals.
The time switch has a position switch, which allows a perma-
nent ON or OFF connection, as well as a third option which
allows a timer function.
With the switched phase, smaller single phase, connected
pumps can be switched directly. For higher power and pumps
connected with several phases, the switchbox SK 602N or
SK 622N can be used with a three-phase contactor. The con-
tactor is then controlled by the time switch.
