INSTALLATION / OPERATION
ADDITIONAL INSTALLATION
MATERIALS (Purchase Separately)
SEARS Sump Pump Hose Kit, Stock No. 2790, containing 24'
(7.3M) of 1-1/4" flexible plastic pipe, 1-1/4" plastic adapter
and stainless steel clamp. We recommend a Check Valve,
SEARS Stock No. 2789.
THE SUMP
Locate sump at lowest place in basement or drained area.
Floor drains or drain tiles can also be tiled into sump.
Minimum sump size is 12" (305mm) diameter by 24"
(610mm) deep. Periodically inspect pump, system com-
ponents, and sump for debris and foreign objects. Keep
sump free from all refuse. Perform routine maintenance as
required. Use a sump cover to exclude refuse from sump.
Consult local code for cover specifications.
PUMP INSTALLATION
Set the pump on the bottom of the sump, making sure that
is sits solidly and is level. Be sure there is enough space
around the pump to allow the switch free movement as the
sump water level changes.
Risk of flooding. If a flexible discharge
hose is used, pump may move around in sump when
motor starts.
If it moves far enough so that the switch hits
the side of the sump, the switch may stick and prevent
pump from starting. Make sure that pump is secured so that
it cannot walk around in sump.
Hose Kit No. 2790 can be used as the discharge pipe. Run
the discharge pipe to the nearest sewer outlet or other point
of disposal. Use the most direct route and the fewest turns
and elbows possible.
Use Teflon tape to seal threads in plastic pipe. Hand tighten
only.
NOTE:
To avoid backflow into sump when pump shuts off,
install a SEARS Check Valve, Stock No. 2789, in threaded dis-
charge port of pump.
AUTOMATIC FLOAT SWITCH
INSTALLATION AND OPERATION
Your SEARS Model 390.305000 Submersible Drainer comes
with the automatic float switch mounted on the motor hous-
ing ready for operation. Tether length is factory set at 3"
(76mm). Do not change tether length.
Risk of electric shock. Always disconnect
the pump and switch from the electrical power source
before doing any maintenance!
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”, Page 4). Plug the
pump power cord into the back of the switch plug.
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!
Be sure to leave at least 5" (127mm) of water above
pump base plate when pump stops. Running pump
dry could ruin the pump and will void the warranty.
Figure 2
Switch tether is factory set at 3" (76mm).
NOTICE:
Do not change tether length.
3
Figure 1
Sewer Tile
Concrete
Sewer Tile
Sump Cover
Basement Floor
1/4" (6mm)
24" Min.
(610mm)
20" to 24"
(500 to 610mm)
20" to 24" Diam.
(500 to 610mm)
3"
(76 mm)
