Electrical Service And Operation - Liberty Pumps LE Serie Manuel D'installation

Installation of Remaining Discharge (Simplex): After the pump has been mounted and the cover sealed, install
C.
the remaining discharge line.
necessary. A check valve is recommended 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" in sewage applications. 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: A connection is provided on top of the cover which
must be piped to the existing building vent, or extended outside on its own standpipe. The vent size should be in
accordance with applicable codes, but not less than the discharge size. Some LE and LEH-Series pumps come
equipped with an air bleed hole to help prevent air lock. A small spray of water from this hole is normal
while pump is running.
Installation of Remaining Discharge (Duplex): Unions or flexible connectors should be installed just above the
D.
cover on each discharge to facilitate removal of the pump if necessary. Free-flow swing check valves should be
installed on each discharge after the union and prior to the gate valve to prevent the back flow of liquid or gas. A
check valve on each discharge line, prior to tying into one common line, is necessary to prevent the recycling of fluid
from one pump to the other. A gate valve is recommended after the check valve to allow for 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 reduce the discharge to below 2" in sewage
applications. Larger pipe sizes may be required to minimize friction head loss of longer runs. Contact Liberty Pumps
or other qualified person if there are questions regarding proper pipe size or flow rates.
Vent: A connection is provided on top of the unit for connection of the vent pipe. This pipe should be tied into the
existing building vent stack, or extended outside on its own standpipe. The vent size should be in accordance with
local codes, but not less than the discharge size. Some LE and LEH-Series pumps come equipped with an air
bleed hole to help prevent air lock. A small spray of water from this hole is normal while pump is running.
4. Electrical Service & Operation
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Risk of electric shock. Always disconnect the pump from the power source before handling or making adjustments.
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The electrical connections and wiring for a pump installation should only be made by qualified personnel.
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This pump is supplied with a grounding conductor or a grounding type attachment plug. To reduce the risk of electric shock, be
certain that the grounding conductor is connected only to a properly grounded control panel or, if equipped with a grounding type
plug that it is connected to a properly grounded, grounding type receptacle.

DO NOT bypass grounding wires or remove ground prongs from attachment plugs.
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DO NOT remove cord and strain relief and DO NOT connect conduit to pump.
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DO NOT use an extension cord.
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This pump requires separate, properly fused and grounded branch circuit. Make sure the power source is properly sized for the
voltage and amperage requirements of the motor, as noted on the pump nameplate.
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The electrical outlet or panel shall be within the length limitations of the pump power cord, and at least 4 feet above floor level to
minimize possible hazards from flood conditions.
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The installation must be in accordance with the National Electric Code and all applicable local codes and ordinances.
When the risk of property damage from high water levels exists, an independent high water alarm or
back up pump system should be installed.
A union should be installed just above the cover to facilitate pump removal if
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