Installation Sheet

6 | EN Copyright © Liberty Pumps, Inc. 2019 All rights reserved. 7034000M
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.
Preparation
 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.
Prepare New Sump [Basin]
Excavation
 Locate all overhead and underground utilities before
excavating.
Excavate the hole as small as possible, with a minimum
recommended 8" diametrical clearance around the tank. Never
place the basin directly in contact with rocks or other sharp
objects. Place only fine, 1/8” to 3/4” pea gravel or 1/8” to 1/2”
washed, crushed stone as bedding between the basin and the
hole walls. Do not use sand or native soil as backfill. Properly
compact underneath the basin to provide a solid, level base that
can support the weight of the filled basin.
Inlet Connection & Initial Backfill
Use only fine, 1/8” to 3/4” pea gravel or 1/8” to 1/2” washed,
crushed stone around the bottom of the basin to hold it in place.
Do not use sand or native soil as backfill.
Make the inlet connection as required per basin.
Liberty Pumps P370 and P380-Series basins have a 4" inlet
molded to the side of the tank. This inlet is sized to accept a 4"
no-hub type coupling. Connect the gravity drainage line from the
fixtures to this hub.
Other Liberty Pumps basins provide a 4" caulking hub or pipe
grommet inlet. Hubs utilize caulking material or rubber donuts;
grommets are a simple slip-fit. Connect the gravity drainage line
from the fixtures to this opening. Other inlet sizes are available,
consult factory.
Final Backfill
Keep large rocks, clods, and foreign objects out of the backfill
material. Only fine, 1/4” to 3/4” pea gravel, or 1/8” to 1/2” washed,
crushed stone is recommended. Do not use sand or native soil as
backfill. Mound the backfill slightly and allow for natural settling.
Provide access to the basin cover for maintenance and service.
Compaction of backfill materials must be adequate to ensure the
support of the tank, and to prevent movement or settlement.
 Do not exert heavy pressure or run heavy equipment on the
backfill material as this could cause the tank to collapse.
Installation
 All installation and maintenance of pumps, controls,
protection devices, and general wiring shall be done by
qualified personnel.
 All electrical and safety practices shall be in accordance with
the National Electrical Code
®
, the Occupational Safety and
Health Administration, or applicable local codes and
ordinances.
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
RISK OF SERIOUS INJURY OR DEATH
RISK OF ELECTRIC SHOCK