Liberty Pumps HT450 Serie Manual De Instalación página 4

Operating Constraints
It is extremely important to verify that the pump has been
sized correctly for the intended installation. The operating
point of the pump must lie within the acceptable range as
outlined by the applicable Liberty Pumps performance chart.
Operating the pump outside of the recommended range can
invalidate the CSA Certification of the pump and can also
cause damage and premature failure. Operating outside of
the recommended range can cause the pump to exceed its
rated nameplate amp draw, which will void the pump
certification. It can also cause motor overheating, cavitation,
excessive vibration, clogging, and poor energy efficiency.
Model Specifications
For complete listing of models and their specifications, refer to
www.LibertyPumps.com/About/Engineering-Specs. Pump
nameplate provides a record of specific pump information.
Inspection and Storage
Initial Inspection
The pump should be immediately inspected for damage that may
have occurred in shipment.
1. Visually check the pump and any spare parts for damage.
2. Check for damaged electrical wires, especially where they exit
the motor housing.
Contact Liberty Pumps customer service to report any damage or
shortage of parts.
Storage Before Use
RISK OF ELECTRIC SHOCK
 Protect the power and control cords from the environment.
Unprotected power and control (switch) cords can allow water
to wick through ends into pump or switch housings, causing
surroundings to become energized.
 At no time shall the pump be stored within an incomplete wet
pit. The pump shall not be placed into the pit until it can be
fully operational.
 Do not allow the pump to freeze.
Pumps are shipped from the factory ready for installation and use.
Hold the pump in storage if the pump station is not complete.
If storage is necessary, the pump should remain in its shipping
container. It should be stored in a clean, dry temperature-stable
environment where the pump and its container are covered to
protect it from water, dirt, vibration, etc. The cord ends must be
protected against moisture.
Uninstalled pumps that are idle for greater than three months
should have impellers manually rotated once a month to lubricate
the seals.
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Pump Design
Liberty Pumps provides an integral anti-airlock hole in the volute
housing of submersible pumps. Airlock occurs when air gets
trapped in the volute/impeller area of the pump and cannot
escape due to the water column above the check valve on the
discharge line. When the basin fills with water and the pump is
called to activate, the impeller spins in this pocket of air and
cannot prime. An anti-airlock hole allows this trapped air to
escape, allowing the pump to prime and start pumping.
A small spray of water from this hole is normal while pump is
running. Bleeding off the air could take from several seconds to
more than a minute once the pump starts.
For added protection, consider the addition of a back-up pump,
such as Liberty Pumps SJ10 SumpJet as well as alarm ALM-P1 or
ALM-2 in applications where loss of pump function could result in
property damage. If an alarm is used, it must be connected to a
separate electrical circuit.
Pump System Components
Float Switches
Automatic Models
Automatic pumps come with two cords—one to the float switch
and the other to the pump motor. The switch cord has a series
(piggyback) plug enabling the pump motor cord to be plugged
into the back of it. The purpose of this design is to allow temporary
manual operation of the pump.
For manual operation, or in the event of switch failure, the pump
cord can be separated and plugged into the electrical outlet,
directly bypassing the switch. Refer to Piggyback Switch
Operation on page 6.
Switchless (Manual) Models
Manual pumps with no switch may be operated by directly
plugging into an approved electrical outlet. To prevent excessive
seal wear and overheating, pumps should not be run dry for
extended periods of time.
If manual models are to be used with an optional control device,
follow the instructions provided with that control and make power
connections per those instructions. Set the turn-off level at 4-1/2"
above bottom of pump or greater. Also, ensure that optional
control device to be used is rated for high temp applications.
Power and Control Cords
 Do not remove cord and strain relief, and do not connect
 Each cord has a green lead. This is the ground wire and must
The power and control cords cannot be spliced, though a junction
box may be used.
Copyright © Liberty Pumps, Inc. 2023 All rights reserved.
RISK OF ELECTRIC SHOCK
conduit to pump.
be grounded properly per NEC
®
and/or local codes.
7229000D