Liberty Pumps LGV Serie Manual De Instalación página 7

SEAL LEAK THERMOSTAT
CONTROL
CABLE
POTTING RESIN FOR
SEAL FAILURE
PROBES
THERMOSTAT
Figure 2. Permanent Cord 3-Phase Wiring
Preparation
RISK OF ELECTRIC SHOCK
 Always disconnect pump(s) from power source(s) before
handling or making any adjustments to either the pump(s),
the pump system, or the control panel.
Install Pump Control and Alarm Floats
The water level in the basin is determined by the placement of the
control floats and should be positioned such that the motor
housing is completely submerged to properly cool the motor. The
upper water level should be positioned to minimize pump starts.
The alarm float should be above the turn-on float switch but below
any inlets.
Set the second (turn-on) control above the lower turn-off control.
The exact distance between the two floats must be a compromise
between a frequent pumping cycle (10 starts per hour max) to
properly manage sewage level, and a longer pump run duration
per start, which maximizes energy efficiency. This distance shall be
determined by the engineer, depending on the conditions of the
application.
Prepare Basin
If replacing a previously installed pump, prepare the basin by
removing the old pump and cleaning all debris from the basin.
Inspect all remaining equipment in the basin including guide rails,
piping, valves, and electrical junction boxes (if present) and repair
or replace as appropriate. Ensure that control hardware such as
floats or pressure transducers are clean, properly adjusted, and in
good working order.
7550000F
L3 L2 L1
POWER
CORD
HAZLOC PUMPS
M2 M3 M1
MOTOR
Copyright © Liberty Pumps, Inc. 2020 All rights reserved.
When installing the pump into an existing basin with a guide rail
system, make certain the pump seats properly. Some vaults have
angled bottoms that might interfere with the pump legs. In this
application, the pump's legs should be trimmed as required.
Liberty Pumps recommends leaving a portion of the leg so that the
pump will stand upright when placed on the floor. Refer to
Figure 3 and Figure 4.
Figure 3. Cut-off Point 3–7 HP Pumps
Figure 4. Cut-off Point 10–15 HP Pumps
Cutter and Impeller Free Movement Check
 Wear Protective Personal Equipment to protect hands as
exposed bottom has sharp edges.
Do not connect any power to pump until this check is complete.
Manually rotate the cutter and impeller to check that they spin
freely with very little resistance. The cutter is located on the bottom
of the pump. The cutter can be carefully rotated by hand, or
rotated by inserting a tool into the cutter bolt. If rotating by hand,
be sure to wear protective gloves as the cutter and cutter plate
have sharp edges. 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 and impeller 5–10 full rotations.
[76.7 mm]
3"
[44.5 mm]
1-3/4"
7 | EN