INSTALLATION / ELECTRICAL
AUTOMATIC FLOAT SWITCH
INSTALLATION AND OPERATION
Your Sears Model 390.304050 Submersible Sewage Pump
comes with the automatic float switch mounted on the
motor housing ready for operation. Tether length is factory
set at 3-1/2".
Risk of electric shock. Always disconnect
the pump and switch from the electrical power source
before doing any maintenance! Your automatic float
switch is a single pole switch and does not control
both sides of the electrical circuit. To reduce the risk
of electrical shock it is essential that it be wired in se-
ries with the hot side of the electrical circuit. Make
sure your outlets are wired according to your local
electrical code.
Follow instructions below to install pump with factory
mounted switch:
1. Be sure automatic float can swing freely through its entire
arc without interference from pump, piping, sump wall
or any other object.
2. Plug the automatic switch cord into a properly grounded
outlet (see “Electrical Connections”).
3. Test the installation by adding water to the sump pit until
pump operates normally as follows:
A. When sump is dry, the watertight automatic float
switch is hanging in a downward position and the
pump is off.
B. As water comes into the sump, the automatic float
switch rises to an upward position and the pump starts.
C. Water will continue to be pumped until the float switch
is hanging in the downward position again, when
pump will stop.
DO NOT ALLOW PUMP TO RUN DRY!
Pump should not be allowed to run dry prior to shutting off.
To do so voids the warranty and could ruin the pump.
ELECTRICAL CONNECTIONS
Risk of electric shock. When servicing
pump always disconnect power to electrical outlet
and remove pump electric cord from outlet.
The Sewage Pump has a 3-prong electric plug. The third
prong is used to ground the pump to prevent possible fatal
shock. The third prong should never be removed. Your elec-
trical outlet should be the 3-prong, polarized type with an
internal ground.
A separate 15 amp branch electrical circuit is recommended.
DO NOT USE AN EXTENSION CORD.
Testing for Ground
For your safety, check your outlet for ground using an
Underwriters Laboratory Listed Circuit Analyzer (Figure 3).
A Circuit Analyzer will tell you by a pattern of lights if the
power, neutral, and ground wires are correctly connected
to your outlet. It can also be used to check other outlets in
your home. A Circuit Analyzer is available in the Sears
Electrical Department.
Grounding Outlet
If your outlet is not grounded, install a copper wire (at least
14 gauge) from the outlet box, as shown in Figure 4 and 5,
to a metal cold water pipe. Use ground clamp on pipe.
IMPORTANT:
The cold water pipe you use as a ground
must have metal continuity to electrical ground. If continu-
ity is interrupted by plastic, rubber, or other electrical insu-
lators; such as hoses, fittings, washers or gaskets (including
water meter or pump), a metal bypass must be used. Any
electrically insulated connector should be jumped (as shown
in Figure 5), with a length of No. 4 wire clamped securely
at both ends.
4
3-1/2"
668 0194
Figure 2
UL Listed
Analyzer
Outlet
665 0194
669 0194
Bare copper wire to
cold water pipe.
Outlet
Box
Meter
Metal Water
Pipe
Clamp
No. 4
Wire
670 0194
Figure 3
Figure 5
Figure 4
