Install Instructions

7034000N Copyright © Liberty Pumps, Inc. 2022 All rights reserved. 5 | EN
Mounting, installation, and wiring connections are specific to the
control panel used. Refer to the manufacturer’s instructions
supplied with the unit.
IMPORTANT: When connecting a new pump to an existing
control panel, verify the panel is correctly sized and equipped for
the pump.
Control panels designed for use with specific pumps available from
Liberty Pumps can be found at http://www.LibertyPumps.com/
Portals/0/Files/panel_selection_guide.pdf or contact Liberty
Pumps.
Float Switches
 Single-phase 208/230V pumps shall only be operated without
the float switch by using the circuit breaker or panel
disconnect.
Automatic Models
All LE-Series automatic models (“A” suffix) come factory-
equipped with a float switch mounted to the pump. These models
come with two cords—one to the float switch and the other to the
pump motor. The switch cord has a series (piggyback) plug
enabling the pump motor cord to be plugged into the back of it.
The purpose of this design is to allow temporary manual
operation of the pump.
For manual operation, or in the event of float switch failure, the
pump cord can be separated and plugged into the electrical
outlet, directly bypassing the switch. Refer to
Piggyback Switch
Operation on page 7.
If using a differential other than the factory setting, verify that
when the pump turns off, the minimum fluid level left in the basin
is per
Table 1 so the impeller remains submerged. Other pumping
differentials may be obtained by tethering the float switch cord to
the discharge pipe.
Note: With wide-angle floats, a minimum cord length of 3-1/2”
from the tether point to the top surface of the float is required for
proper float switch operation.
Note: If the factory-mounted float is removed from the pump for
relocation to the discharge pipe, replace and tighten all pump
hardware.
Switchless (Manual) Models
Manual pumps with no float switch are intended to be run using
an approved liquid level control or approved motor control with
correct rating that matches motor input in full load amperes.
Regardless of the control type, verify that when the pump shuts
off, the minimum fluid level left in the basin is per
Table 1 so the
impeller remains submerged.
IMPORTANT: Manual pumps factory constructed with a power
cord with no male attachment plug must use an approved motor
control panel. Do not wire a switch in series with the pump power
cord.
Automatic operation with optional control devices: if the
pump(s) are to be operated by either a simplex or duplex control
panel, or other optional control device, follow the manufacturer’s
instructions provided with the control panel for power
connections.
Float Switch Settings
Table 1 includes factory set float levels for automatic models. The
turn OFF level must be maintained as it is the minimum water
depth to ensure proper cooling. Manual pumps have user set turn
ON levels.
Prepa ra tion
 Always disconnect pump(s) from power source(s) before
handling or making any adjustments to either the pump(s),
the pump system, or the control panel.
The basin required for both effluent and sewage applications
must be sealed and vented to meet health and plumbing code
requirements. Proper basin size and materials for specific
applications vary depending on the type of system and local
codes. Check local codes prior to purchasing and installing the
basin.
The diameter should be a minimum of 18” and the depth a
minimum of 24”. A larger basin may be required depending on
local codes and the number of fixture units entering the system.
Check with the local authorities or contact Liberty Pumps if unsure
of the proper basin size. Installation should be at a sufficient
depth to ensure that all plumbing is below the frost line. If this is
not feasible, size the basin and/or adjust pump differential to
accommodate the additional backflow volume.
Prepare Existing Sump [Basin]
If replacing a previously installed pump, prepare the basin by
removing the old pump and cleaning any debris from the basin.
Inspect all remaining equipment in the basin including piping,
valves, and electrical junction boxes (if present) and repair or
replace as appropriate.
RISK OF ELECTRIC SHOCK
Table 1. Factory Set Float Switch Settings
Model Series Turn OFF Level Turn ON Level
LE40 7” 15”
LE41AV 5.5” 11”
LE50 6” 14”
LE51AV 5.5” 11”
LE50 6” 14”
LE70 8.4” 16.4”
LE100 8.4” 16.4”
LEH150 9” 16.5”
LEH200 16.5” user set
RISK OF ELECTRIC SHOCK