5647000M
Copyright © Liberty Pumps, Inc. 2021 All rights reserved.
7 | EN
The pump can remain upright or can be laid down on its side for
easier access to the cutter.
Besides verification that the cutter and impeller are freely
spinning, rotating the cutter helps to lubricate the shaft seals if the
pump has been non-operational for more than a week. It is
recommended to rotate the cutter 5–10 full rotations.
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.
For pressure sewer applications,
verify a Redundant Check
Valve Assembly (curb stop and check valve) is installed
between the pump discharge and the street main, as close to
the public right-of-way as possible, on all installations to
protect from system pressures.
Electrical Connections
With mains power disconnected, complete pump and control
wiring connections per manufacturer’s wiring diagrams included
with the control panel and Figure 1 (external capacitor models)/
Figure 2 (3-phase models) as applicable. Check all wires for
unintentional grounds after the connections are made.
Automatic Pump Direct Wiring
Ground
Black
Junction Box
Power
Supply
Float
Switch
Pump
Green
Black
White
Green
Black
White
White
In 208/230V installations, one side of the line going to the
pump is always “hot”, whether the float switch is on or off. To
avoid hazards, install a double pole disconnect near the pump
installation.
Figure 3. Direct Wiring of 208/230V, 1-Phase, Automatic Pumps
The pump can run on a voltage rating of 208V or 230V. Verify that
it is the same as the supply voltage. The pump is supplied with a
6-20P (20A) cord plug end. If a 1-phase pump will be wired
directly into a junction box, it is necessary to remove the plug.
Qualified personnel shall complete the wiring in accordance with
the National Electric Code and applicable local codes. A
disconnecting means for the pump shall be located in sight from
the pump/basin location. See Figure 3 for direct wire installation
of 1-phase, automatic pumps.
3-Phase Pump Rotation Verification
BOTTOM VIEW
Check 3-phase pumps for correct rotation prior to installing
pump(s) in basin. To change rotation, reverse any two of the
three power leads to the pump (not the ground). Code the
wires for reconnection after installation.
Three-phase power uses three
separate alternating currents that
peak at different integrals. With
pumps that are powered by three
phase electric, the phase sequence of
the motor must match the phase
sequence of the power source. When
the phase sequences match, the
pump operates properly. However,
when the phases are out of order, the
pump runs backward (i.e., the impeller
rotates in the wrong direction). This
causes an extreme loss of
performance and could raise the current draw, which could result
in tripping an overload or circuit breaker.
To ensure that the power to the pump is installed correctly, always
verify proper rotation
before
lowering it into the basin. If the
pump is rotating in the wrong direction, turn off the power and
reverse any two power leads. This reverses the phase sequence
and corrects the pump rotation.
Rotation must be
counterclockwise when looking from the bottom of the pump.
Piggyback Switch Operation
G
G
6-20R
6-20P
IMPORTANT:
Verify breaker is turned off before plugging in the
switch.
Plug the piggyback switch into a 6-20R receptacle.
The receptacle must be wired to a 30 Amp breaker.
Plug the pump into the piggyback receptacle.
Install cable clamp for strain relief.
Install cable
clamp to wall
for strain relief
Temporary Manual
Operation
YES!
NO!
RISK OF ELECTRIC SHOCK
RISK OF SERIOUS INJURY OR DEATH
