8 | EN
Copyright © Liberty Pumps, Inc. 2021 All rights reserved.
3473000C
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
When working in a hazardous location, all precautions to
minimize ignition sources such as spark and flame should be
taken to limit the potential for fire or explosion.
If guide rails are used
, refer to the separate instructions supplied
with the unit for proper installation and operation. Verify all
gaskets and components are present. Use of a guide rail system
shall be of a non-sparking design. Contact Liberty Pumps for
available models, such as GR22NS-LE or GR30NS (XLE100/150
models).
If guide rails are not used
, complete all pump-related plumbing
at this time. Verify 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.
Place pump in basin, making certain the mounting interface (i.e.,
guide rail, torque stop, etc.) is engaged correctly.
Discharge
A union should be installed just above the cover to facilitate pump
removal if necessary. A check valve is required after the union 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 restrict the
discharge to below 2”. Larger pipe sizes may be required to
eliminate friction head loss over long runs. Contact Liberty Pumps
or other qualified person if there are questions regarding proper
pipe size and flow rates.
Vent
Vent basin in accordance with applicable plumbing codes.
Operation
Energizing the control panel or breaker for the first time is
potentially dangerous. Licensed electrical personnel should
be present when the panel or breaker is energized for the first
time. If faults caused by damage or poor installation practices
have not been detected, serious damage, injury or death can
result when power is applied.
Starting System
1. Verify all plumbing components in the basin are installed
correctly and functional. Verify all valves are open and ready
for pump use.
2. Double check all wire connections. Re-tighten all factory and
field connections.
3. Ensure pump has no obstructions.
4. With all electrical and mechanical connections complete and
secure, turn on power to control panel and pump.
5. Verify operation of the pump, floats, and alarm circuits.
6. Run several cycles of water through the system to verify
correct control operation for the installation.
Be certain to complete adequate testing, especially on systems
with multiple pumps or custom control configurations.
RISK OF FIRE
BOTTOM VIEW
ROTATION
RISK OF SERIOUS INJURY OR DEATH
