Dwyer CFS2 - Manual (Page 2)

INSTALLATION INSTRUCTIONS
The basic operating principle of the CFS2 is very simple. As fluid level rises the float
will also rise, resulting in a tilt of the micro-switch located inside the housing. This tilt
will generate a signal that can be used to actuate a motor or signal an indicator alarm.
To ensure the proper function of the CFS2, it is necessary to secure the electric cable
inside the tank or well as illustrated in Figures 1 and 2. The length of the cable
measured between the fixture point and the body of the CFS2 determines the total
extension of the float and also the resulting distance between the pump stopping and
starting level. It is essential to ensure that there are no obstructions in the CFS2
operational area before operation. During operation, adjustments to the CFS2 cable
must not be made under any circumstances, due to the fact that any unwanted
cable connections made while the CFS2 is immersed in water can lead to electric
shock. There are two installation options for this cable float switch. One method is to
fix the cable of the CFS2 to the reservoir or container with the use of a small clamp,
another technique would be to attach the accessory A-457 counterweight to the cable
of the float switch a desired distance between the highest and lowest level desired.
Note: With the use of the counterweight, the length of cable between the float and
fixed point (starting and stopping indication) can be freely adjusted.
ELECTRICAL CONNECTIONS
The Series CFS2 features a variety of different cable options. One of these options
includes the selection between SPST and SPDT. SPST, single pole single throw,
allows a single operating function with the choice of operation on increasing level
(NC/filling) or operation on decreasing level (NO/emptying), depending on the model
selection. SPDT, single pole double throw allows for operation of both increasing and
decreasing level, depending on the connections made between the terminals of the
micro-switch and the cable. SPDT, which is a four-conductor cable (ground option) or
a three-conductor cable (without ground option), has one lead that is common, one
that is normally open (NO), and the other that is normally closed (NC), for the proper
connections of these conductors please refer to the wiring diagrams in Figures 3 to
12.
Figure 2-Filling Figure 1-Empyting
When making the connections described above, ensure that the
maximum motor power does not exceed the values indicated on
the level switch. The power supply cable is an important part of the CFS2. Should the
cable appear to be damaged, discontinue use immediately and proceed to replace the
unit. The yellow/green wire found on some units is the ground wire and must be
connected to a suitable ground terminal with the dimension greater than 1 mm
2. The
terminal used must also be protected against accidental break.
NOTICE
L-CFS2:SSS-1000 12/8/10 8:39 AM Page 2