Barnes BP31 Series, Installation And Operation Manual, Page: 6 / 18

SECTION C: INSTALLATION
C-1) Location:
These pumping units are self-contained and are recommended for use in a sump or basin. This pump is designed
to pump effluent or wastewater, nonexplosive and noncorrosive liquids and shall
NOT be installed in locations
classified as hazardous in accordance with the National Electrical Code (NEC), ANSI/NFPA 70. The sump or basin
shall be vented in accordance with local plumbing codes. Provide proper sump diameter of approx. 18" (457mm)
minimum and depth of approx. 20" (508mm) minimum to allow the pump and switch to operate without restriction.
The float switch should not come in contact with side or bottom of sump. Make sure sump is free of string, cloth,
nails, gravel, etc. before installing pump. Never install the pump in a trench, ditch, or hole with a dirt bottom where
the suction will become plugged.
C-1.1) Submergence:
The minimum sump liquid level should never be less than 2.5 inches (64mm) above the pump bottom.
C-2) Discharge:
Discharge piping should be as short as possible. The installation of a check valve in the discharge piping is
recommended for each pump being used. The check valve is used to prevent backflow into the sump. Excessive
backflow can cause flooding and/or damage to the pump.
C-3) Liquid Level Controls
Figure 2 shows a typical installation for any submersible pump using a level control mounted to the discharge piping
with a piggy-back plug.
General Comments:
1) Never work in the sump with the power on.
2) Level controls are factory set for a pumping differential of 9
inches. If that is the cycle desired, simply circle the discharge
pipe with the pipe mounting strap, feed the end through the
worm drive, and tighten with a screwdriver. Be certain that the
level control cannot hang up or foul in it’s swing. Also, make
certain the pump impeller is still submerged when the level
control is in the ’off’ mode.
3) If a higher pump differential is needed, grip the cord near the
neck of the float, then using the other hand, exert a steady force
on the lower edge of the cable clamp. The cable clamp should
slide up to the new pivot point. Attach the level control to the
discharge hose in the manner described above.
4) Plug the level control plug into a GFI receptacle, then plug
the pump into the piggyback plug. One cycle of operation
should be observed , so that any potential problems can be
corrected.
5) It is recommended that the float should be set to insure that
the sump well liquid level never drops below the top of the motor
housing or a minimum level of 2.5" (64mm) above the pump
bottom.
WALL SOCKET
GFI
DISCHARGE
⇒
⇒
INFLOW
TYPICAL INSTALLATION WITH
WIDE ANGLE LEVEL CONTROL
ON
OFF
Fig. 2
6