Liberty Pumps 251-3 Manuel D'installation page 8

For automatic operation using Liberty's supplied switch, the two cords should be interconnected and plugged
into a separately fused grounded outlet of proper amp capacity for your selected pump model. (See Section 1, General
Information or the pump nameplate for electrical specifications of your model.) Both cords are equipped with 3-prong
plugs and must be plugged into a properly grounded 3-wire receptacle. DO NOT REMOVE THE GROUND PRONGS.
208-230V single phase pumps shall only be operated without the float switch by using the circuit
breaker or panel disconnect.
Do not let the pump run dry.
The turn-on/turn-off levels vary depending on model. (See model specifications chart on page 3 for the "factory" preset
level of your specific model.) Other pumping differentials may be obtained by tethering the switch cord to the discharge
pipe. NOTE: A minimum cord length of 3-1/2" from the tether point to the top surface of the float is required for proper
switch operation. If using a differential other than the factory setting, be sure that when the pump shuts off, at least
3-1/2" of fluid is left in the basin so the impeller remains submerged. (Models 251, 257, 281, 287, 291, and 297 have
factory-preset switches that are not adjustable.)
Manual pumps with no switch are intended to be run using an approved liquid level control or approved motor control
with correct rating that matches motor input in full load amperes. Regardless of the control type, be sure that when the
pump shuts off, at least 3-1/2" of fluid is left in the basin so the impeller remains submerged.
NOTE: For automatic operation with optional control devices: If the pump(s) are to be operated by either a
simplex or duplex control panel or other optional control device, follow the installation instructions provided with the
control and make the power connections per those instructions. If necessary, certain models may be run without a
separate control.
208-230V single phase pumps shall only be operated without the float switch by using the circuit
breaker or panel disconnect.
Do not let the pump run dry.
3 Phase Pump Models (FL63, FL64, FL73, FL74, FL103, FL104, FL105, FL153, FL154, FL155,
FL203, FL204, FL205)
For 3-Phase pumps, check for proper rotation before installing pump into basin (see Fig. 5).
Bottom View
Fig. 5 – Proper impeller rotation,
three phase models
Check three phase pumps for proper
rotation prior to installing pump(s) in
basin. To change rotation, reverse any
two of the three power leads to the
pump. Code the wires for reconnection
after installation.
©Copyright 2018 Liberty Pumps Inc. All rights reserved 8