Liberty Pumps 230 Serie Manuel D'installation page 5

Preparation
For ordinary ground water pumping applications, the sump basin
diameter should be a minimum of 14" (minimum of 10" for
models 247, 237, and 457). A larger diameter pit is preferred as it
allows for longer pump cycling and reduced switch cycling. The
depth of the pit should be at least 12" above the surface on which
the pump is resting. A sump basin cover is required for safety and
to prevent foreign objects from entering the basin.
Prepare Existing Sump [Basin]
RISK OF FIRE
 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.
If replacing a previously installed pump, prepare the basin by
removing the old pump. Separate the discharge pipe at either the
check valve or at the union. If neither a check valve nor a union is
part of the existing discharge pipe, cut the pipe with a hacksaw
and remove the pump. A check valve and optional union will need
to be installed at this cut.
Clean 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.
If the basin is not already enclosed on the bottom, provide a hard
level bottom of bricks or concrete. Do not place the pump directly
on earth, gravel, or debris since this can cause excessive wear of
the impeller and possible jamming. "The Brick" (Liberty Pumps
#4445000) is a pre-molded stable platform designed to fit the
submersible pump. It raises the pump 2-1/2" off the bottom of the
basin, reducing the potential for jamming from rocks and debris.
Contact a local distributor to order.
Prepare New Sump [Basin]
Excavation
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.
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.
7108000K
Compaction of backfill materials must be adequate to ensure the
support of the tank, and to prevent movement or settlement.
Anti-Airlock
To speed or assist with air bleed in
the event of airlock, the addition of
a 1/8" hole in the discharge pipe is
recommended. This hole should be
no more than 1/8" diameter and
drilled low on the pipe—just above
the threaded connection to the
pump discharge. Refer to figure.
Installation
 All installation and maintenance of pumps, controls,
 All electrical and safety practices shall be in accordance with
Pump
Record information from pump nameplate onto cover of these
instructions. Complete a visual inspection before lowering into
basin.
Place pump in basin being sure any mounting interface (i.e., "The
Brick" platform, torque stop) is engaged correctly.
Models with wide-angle float switches must have adequate
clearance to side wall of basin with free, unobstructed movement
throughout its complete travel and must not contact the pump,
piping, or other objects.
Discharge
Make all discharge connections. A 1-1/2" NPT threaded discharge
is provided for connection of the discharge pipe. Do not reduce
the discharge size to less than 1-1/4", as this will affect pump flow
and performance. Schedule 40 PVC pressure pipe is
recommended; however, flexible discharge hose kits may be used
for temporary installations. Connect pipe or discharge hose to the
discharge of the pump. Hand-tighten only as over-tightening can
damage the pump discharge.
Install a union or other means of separating the discharge pipe
just above the floor to facilitate removal of the pump if necessary.
A check valve is required to 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.
Do not reduce the discharge to below the pump outlet size.
Larger pipe sizes may be required to eliminate friction head loss
over long runs.
Copyright © Liberty Pumps, Inc. 2023 All rights reserved.
RISK OF ELECTRIC SHOCK
protection devices, and general wiring shall be done by
qualified personnel.
®
the National Electrical Code
Health Administration, or applicable local codes and
ordinances.
Discharge pipe
Drill 1/8" anti-
airlock hole into
DISCHARGE PIPE
, the Occupational Safety and
5 | EN