Effluent Applications - Liberty Pumps 251-3 Manuel D'installation

4. Effluent Applications

Vertical Magnetic Float (VMF) models (257, 287 and 297) are not recommended for effluent applications due to their
short On/Off cycle. Wide angle float models are better suited for effluent applications and are easily adjustable for
different On/Off levels.
The basin required for effluent applications must be sealed and vented to meet health and plumbing code requirements.
Proper basin size and basin materials for effluent applications vary depending on the type of effluent system and local
codes. Check with your local codes official prior to purchasing and installing the basin. Follow the manufacturer's
recommended guidelines for installation of your specific basin. A minimum diameter of 18" and depth of 24" is required
for proper pump operation, but larger basins are preferred for longer pump cycles and increased switch life. Installation
should be at a sufficient depth to ensure that all plumbing is below the frost line. If this is not feasible, delete the check
valve and size the basin and/or adjust the pump differential to accommodate the additional backflow.
These pumps are not to be installed in locations
classified as hazardous in accordance with the
National Electric Code, ANSI/NFPA 70, or where
prohibited by local codes.
A. Simplex (One Pump) Systems (see Fig. 2): Set the pump in place
making sure the float has adequate clearance to the side wall of the
basin. The float must be free to move throughout its travel and not
contacting the pump body, piping, or other objects. If an optional
control device or float is used, follow the directions for mounting that
accompany the optional control. Connect the discharge pipe to the
pump's threaded discharge. IMPORTANT: DO NOT REDUCE THE
DISCHARGE PIPE SIZE BELOW THAT WHICH IS PROVIDED ON
THE PUMP. Contact Liberty Pumps or other qualified person if you
have questions regarding proper pipe sizes and flow rates.
Mount the basin cover making sure it is properly sealed.
Installation of Discharge: After the pump has been
mounted, install the discharge line.
installed to facilitate pump removal if necessary. A free-flow
swing check valve is recommended after the union
prevent the backflow of liquid after each pumping cycle. A
gate valve should follow the check valve to allow periodic
cleaning of the check valve or removal of the pump. The
remainder of the discharge line should be as short as
possible with a minimum number of turns, to minimize
friction head loss. Contact Liberty Pumps or other qualified
person if you have questions regarding proper pipe sizes
and flow rates.
(All Liberty effluent/dewatering pumps come equipped with
an air bleed hole in the base of the pump to help prevent
airlock. A small spray of water from this hole is normal
while pump is running.)
B. Duplex (Two Pump) Systems (see Fig. 3):
pumps in place in the bottom of the basin. The duplex
control used will include 3 or 4 floats that will either be
tethered to one of the discharge pipes or to an independent
rod or bracket. Follow the instructions provided with your
duplex control device. Each float must be free to move
throughout its travel and not contacting the pump
body, piping, or other objects. Connect an individual
discharge pipe to each pump.
A union should be
to
Set both
©Copyright 2018 Liberty Pumps Inc. All rights reserved
Fig. 2 – Typical Installation Simplex System
This is a recommended installation only.
Variations may apply.
Fig. 3 – Typical Installation Duplex System
This is a recommended installation only.
Variations may apply.
6