Liberty Pumps LSG200 Serie Mode D'emploi page 7

4.01 ELECTRICAL POWER CORD
The submersible pumps shall be supplied with 25 feet of multi-conductor power cord (35 feet for external capacitor models). It shall be
cord type SJOOW (1-phase), SEOOW (3-phase), or SOOW (external capacitor models), capable of continued exposure to the pumped
liquid. The power cord shall be sized for the rated full load amps of the pump in accordance with the National Electric Code. The power
cable shall not enter the motor housing directly but will conduct electricity to the motor by means of a watertight compression fitting cord
plate assembly with molded pins to conduct electricity. This will eliminate the ability of water to enter internally through the cord via a
damaged or wicking cord.
5.01 MOTORS
All motors shall be oil filled and class B insulated NEMA B design rated for continuous duty. Since air filled motors are not capable of
dissipating heat as effectively, they shall not be considered equal. Single-phase motors shall be capacitor start/capacitor run and have an
integral thermal overload switch in the windings for protecting the motor. Three-phase motors shall be used with an appropriate
controller with integral overload protection. On all single-phase models (excluding LSG202M-C and LSGX202M-C), the capacitor circuit
shall be mounted internally and motors shall have an integral solid state starting circuit switch for switching the start winding off.
6.01 BEARINGS AND SHAFT
An upper radial and a lower angular contact ball bearing shall be required. The upper bearing shall be a single ball/race type bearing. The
lower bearing shall be an angular contact heavy-duty ball/race type bearing, designed to handle axial grinder pump thrust loads. Both
bearings shall be permanently lubricated by the oil, which fills the motor housing. The bearing system shall be designed to enable proper
cutter alignment from shut off head to maximum load at 10 feet of TDH. The motor shaft shall be made of 300 series stainless steel and
have a minimum diameter of 0.670".
7.01 SEALS
The pump shall have a dual seal arrangement consisting of a lower and upper seal to protect the motor from the pumping liquid. The
lower seal shall be a fluoroelastomer molded double lip seal designed to exclude foreign material away from the main upper seal. The
upper seal shall be a unitized silicon carbide hard face seal with stainless steel housings and spring equal to Crane Type T-6a. The motor
plate/housing interface shall be sealed with a Buna-N O-ring.
8.01 IMPELLER
The impeller shall be an investment cast stainless steel impeller with pump out vanes on the back shroud to keep debris away from the
seal area. It shall be keyed and bolted to the motor shaft.
9.01 CUTTER MECHANISM
The cutter and plate shall consist of 440 stainless steel with a Rockwell C hardness of 55–60. The stationary cutter plate shall have specially
designed orifices through it, which enable the slurry to flow through the pump housing at an equalized pressure and velocity. The
stationary cutter shall consist of V shapes to maximize cutting action and arc shape exclusion slots to outwardly eject debris from under
the rotary cutter. The rotary cutter shall have (4) blades and be designed with a recessed area behind the cutting edge to prevent the
accumulation and binding of any material between rotary cutter and the stationary cutter. The cutting system must incorporate close
tolerances for optimum performance. Ring or radial cutters, or those that grind on the outside circumference, shall not be considered
equal.
10.01 CONTROLS
Select single-phase units (excluding external capacitor models) can be supplied with CSA and UL approved automatic wide angle tilt float
switches. The switches shall be equipped with piggyback style plug that allows the pump to be operated manually without the removal of
the pump in the event that a switch becomes inoperable. Manual pumps are operable by means of a pump control panel.
Copyright © Liberty Pumps, Inc. 2019
7000 Apple Tree Avenue Bergen NY 14416
All rights reserved. Specifications subject to change without notice.
⯀ ⯀
Phone 800-543-2550
⯀
Fax 585-494-1839 Email Liberty@LibertyPumps.com
LSG200_P7 R7/17/2019
⯀
Web www.LibertyPumps.com