Liberty Pumps LGV Serie Manual De Instalación página 8

Installation
RISK OF ELECTRIC SHOCK
 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
Health Administration, or applicable local codes and
ordinances.
Electrical Connections
With main power disconnected, complete pump and control
wiring connections per wiring diagrams included with the control
panel and Figure 2/Figure 1. Verify connections. All wires shall be
checked for unintentional grounds after connections are made.
3-Phase Pump Rotation Verification
 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.
Correct Impeller Rotation
TOP VIEW
3-phase power uses three separate alternating currents that peak
at different integrals. With pumps that are powered by 3-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 of the three power leads to the pump (not the ground).
This reverses the phase sequence and corrects the pump rotation.
For 3-phase pumps, rotation must be clockwise when looking
from the top of the pump. The correct direction is also stamped on
the bottom of the volute.
Vent
Vent basin in accordance with engineer's specifications following
all applicable plumbing codes.
8 | EN
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, the Occupational Safety and
BOTTOM VIEW
Copyright © Liberty Pumps, Inc. 2020 All rights reserved.
Discharge Line
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 for periodic cleaning of the check valve or removal of the
pump. The remainder of the discharge line shall be as short as
possible with a minimum number of turns, to minimize friction
head loss. Do not reduce the discharge to below the pump outlet
size. 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.
Thermostat and Seal Failure Connections
Verify thermostat wires are connected in series with the contactor,
seal fail probes are properly connected, and relay sensitivity
properly adjusted. Connections are provided on the terminal strip
inside the Liberty Pumps control panel.
Seal leak relay setup: Turn the dial completely up, connect the
leads from the pump, then push the test button. The light should
turn on. While still depressing the button, turn the dial down until
the light turns off, then turn the dial up until the light turns back
on. For best results, the potentiometer dial should be around 160.
If the pump is connected directly to a seal leak relay in the panel
(no test button), the dial should be set to around 75. Turn the
potentiometer dial clockwise until the red light turns on, then turn
the dial counterclockwise until the red light turns off. The tick
marks on the seal leak relay are for reference only.
Guide Rail System
If guide rails are used, refer to the separate installation instructions
supplied with the unit.
Additional Warning for Hazardous Locations
RISK OF FIRE
 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.
For hazardous locations, use of a guide rail system shall be of a
non-sparking design. Contact Liberty Pumps for available models.
Operation
RISK OF SERIOUS INJURY OR DEATH
 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. Double check all wire connections.
2. Turn pump(s) to OFF position on H-O-A switch.
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