Liberty Pumps HT450 Serie Manual De Instalación página 5

Preparation
For ordinary ground water pumping applications, the sump basin
diameter should be a minimum of 14". 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 20". 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.
Compaction of backfill materials must be adequate to ensure the
support of the tank, and to prevent movement or settlement.
7229000D
Material Usage
Use of this pump in high temperature water necessitates that
accessories be rated for high temperature use as well. The
following table includes a short list of accessories and materials to
avoid, and recommended alternatives. This list is not intended to
be all-inclusive, and consideration should be given to the
temperature rating of all materials that will come in contact with
high temperature water.
Unacceptable
Acceptable
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.
Copyright © Liberty Pumps, Inc. 2023 All rights reserved.
Pipe
PVC, CPVC, Standard pump,
polyethylene control, and
tube alarm floats
High
temperature
Steel, copper
pump, control,
and alarm floats
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.
Control / Alarm Sump /
Floats Basin
Polyethylene,
fiberglass
Concrete,
steel
Discharge pipe
Drill 1/8" anti-
airlock hole into
DISCHARGE PIPE
, the Occupational Safety and
5 | EN