Liberty Pumps 2448-Series - Manual (Page 3)

©Copyright 2011 Liberty Pumps Inc. All rights reserved 3
A. Excavation: Excavate the hole for the basin as small as possible, with a minimum base diameter of 38”. Never place the basin in
direct contact with rocks or other sharp objects. Place enough fine, 1/8" to 3/4" pea gravel or 1/8" to 1/2" washed, crushed stone at
the bottom of the excavation to create a minimum of 12 inches stone or gravel after compaction. 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. If a
concrete pad will be used under the basin, the compacted stone sub-base can be reduced to 6 inches.
B.
Connections & Backfill: Pour enough concrete over and around the anti-floatation flange to anchor the basin and prevent
upward movement. Connect 1¼” schedule 80 PVC pipe to the pump discharge. Do not reduce the size of the discharge piping,
and do not increase the discharge piping to larger than 2”. The remainder of the discharge line should be as short as possible with
a minimum number of turns. Connect the inlet line to the 4” cast iron inlet hub using oakum and lead or with a rubber donut.
Connect the electrical coupling to 2” electrical conduit and run the power and float cords through the conduit to the control panel.
The remaining backfill should be only fine, 1/8" to 3/4" pea gravel or 1/8" to 1/2" washed, crushed stone. Do not use sand or native
soil as backfill*. *Other backfill options may be available – consult the factory for special instructions relative to your situation
Do not exert heavy pressure or run heavy equipment on the backfill material as this could cause the
tank to collapse.
C. Venting: The fiberglass basin provided with the 2448 must be completely sealed and properly vented in order to meet health and
plumbing code requirements. The 2448 is designed to be
vented through the inlet to an existing building vent stack. In
order to accomplish this, there must be no traps between the
2448 inlet and the nearest building vent stack connection. See
fig. 1 for an example. If this is not possible or desirable in your
application, a vent flange or grommet can be installed in a hole
cut into the solid fiberglass cover.
D. Alarm:

Risk of Electric shock: This pump is supplied with a
grounding conductor. To reduce the risk of electric shock,
be certain that it is connected only to a properly grounded
earth wire.

All electrical circuitry should be installed in accordance with
the National Electric Code (NEC) and all applicable local
codes or ordinances.
IMPORTANT: The alarm panel that is an integral part of this
complete unit is supplied with its own separate
Installation/Operation/Maintenance manual. Ensure that you
have received this manual, and that you read and understand it
prior to installing this unit. Your familiarity with the control panel
manual is critical.
A separate 115V branch circuit is required for the alarm circuit.
Do not split the incoming pump power circuit to power the
control circuit.
Connect the grinder pump leads and the float switch leads to
the control panel in accordance with the instructions included
with those units.
E. Float Switches: The float switch for the alarm is internally weighted and does not have to be clamped. The pump cycle is pre-set
at the factory at 12” (approximately 25 gallons). The pump cycle can be adjusted by loosening the cord grip and moving the “on”
float up or down. We do not recommend adjustments of more than 3” in either direction – please call the factory if you need to
adjust the pump cycle beyond this recommended level.
F. Testing and Startup: Follow the testing and startup procedures found in the pump and control panel manuals.
G. GR20 Assembly: The GR20 quick disconnect assembly provided with your grinder package system is designed to allow easy
installation and removal of the pump. Please ensure that installation is done as per the diagrams below.
3. Installation
Fig. 1 – Inlet Venting
2448 System