ADDITIONAL INSTALLATION
MATERIALS
SEARS Sump/Utility Pump Hose Kit, Stock No. 27909, con-
taining 24’ of 1-1/4” flexible plastic pipe, a 1-1/4” plastic
adapter and a stainless steel clamp.
Check Valve, SEARS Stock No. 2789.
THE SUMP
The sump should be located at the lowest place in the base-
ment or area to be drained. Floor drains from other areas in
the basement may be tiled into the sump. Drain tile around
a house foundation can also be tiled into the sump, effec-
tively removing water and relieving pressure from this area.
A suitable sump can be a 20" or 24" sewer tile. Sump must
be at least 12” in diameter.
A sump cover is desirable to exclude refuse from the sump.
Consult local code for sump cover specifications.
SPECIFICATIONS
Power supply required ....................................115V, 60 HZ.
Horsepower (390.303300) ..............................................1/3
Horsepower (390.303490) ..............................................1/2
Motor duty .........................................................Intermittent
Liquid Temp. Range...........................32°F to 70°F(0°-21°C)
Circuit Requirement GFCI Class A..........................15 Amps
Motor full load (maximum - 390.303300) .............5.8 Amps
Motor full load (maximum - 390.303490) .............7.6 Amps
Discharge (390.303300) ......................................1-1/4" NPT
Discharge (390.303490) ......................................1-1/2" NPT
PUMP INSTALLATION
Check your local Electrical and Plumbing Codes before in-
stalling pump. You must comply with their rules.
Set the pump on the bottom of the sump, making sure that
it 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. Do not install on clay, earth, or
sand.
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.
Use 1-1/4” plastic pipe from installation kit No. 27909 for
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. For Model
390.303490 use 1-1/2” x 1-1/4” reducer bushing (included
with pump).
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 (390.303300) or 1-1/2”x1-1/4” reducer
bushing (390.303490). Reducer bushing is included with
Model 390.303490. Be sure arrow on check valve body
points away from the pump. This SEARS Check Valve is
equipped with an air bleed hole to prevent airlocking pump.
If using any other check valve, drill 1/8” (3.2 mm) hole in
discharge pipe just above pump body but below check valve
to prevent air locks.
3
Figure 1
Figure 2
Switch
Rubber Bushing
Stop (D)
Switch Arm
Rubber Bushing
Stop (C)
Stainless
Steel Rod
Sump Cover
Rubber Bushing
Stop (A)
Marked “TOP”
Float
Rubber Bushing
Stop (B)
Rod Guide
Check
Valve
1220 0894
