Installation Sheet

7034000M Copyright © Liberty Pumps, Inc. 2019 All rights reserved. 7 | EN
Electrical Connections
With main power disconnected, complete pump and control
wiring connections per manufacturer’s wiring diagrams included
with the control panel as applicable. Once connections are made,
all wires should be checked for unintentional grounds.
3-Phase Pump Rotation Verification
 Check 3-phase pumps for proper 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.
3-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 leads to the pump (not ground). This reverses the
phase sequence and corrects the pump rotation. For 3-phase
pumps, rotation must be counterclockwise when looking from the
bottom of the pump. Label the wires for reconnection after
installation.
Guide Rail System
If guide rails are used, refer to the separate instructions supplied
with the unit for proper installation and operation, making sure all
gaskets and components are present. Liberty Pumps Guide Rail
System features a self-aligning mounting bracket. Contact Liberty
Pumps for available models, such as GR22 and GR30.
If guide rails are not used, complete all pump-mounted plumbing
at this time, being sure all gaskets and components are present.
Pump
Record information from pump nameplate onto inside cover of
these instructions. Complete a visual inspection before lowering
into basin.
Discharge
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 that which is provided
on the pump. Larger pipe sizes may be required to eliminate
friction head loss over long runs. Contact Liberty Pumps or other
qualified person if questions arise regarding proper pipe size and
flow rates.
Vent
The basin must be completely sealed and properly vented per
local health and plumbing code requirements. The system 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 system inlet and the nearest building vent stack
connection. If this is not possible or desirable per the application,
a vent flange or grommet can be installed in a hole cut into the
cover.
BOTTOM VIEW
ROTATION
SYSTEM
VENT
DISCHARGE
Ground Level
Optional Above
Ground Vent
SEWAGE LINE
INDOOR APPLICATION
OUTDOOR APPLICATION