©Copyright 2015 Liberty Pumps Inc. All rights reserved
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Direct Wiring of 115V or 230V,
Single Phase, Automatic Pumps
TEMPORARY
MANUAL
OPERATION
DO!
DON’T!
Fig. 4 Piggyback plug installation.
All "A" models
(automatic pumps) come factory-equipped
with a float switch mounted to the pump. These models 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 (see Fig. 4). The purpose of this design is to allow manual
operation of the pump. Note, on / off operation of the pump
must be controlled by the circuit breaker.
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.
In the event of switch failure, the pump cord can be separated and plugged into the electrical outlet, directly
bypassing the switch. For 115V and 230V single phase pumps should 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 level of automatic "A" models is approximately 12" to 16" above the bottom of the basin. The turn-off
level is approximately 6" above the bottom of the basin. Other pumping differentials may be obtained by tethering
the switch cord to the discharge pipe. NOTE: A minimum cord length of 3.5" 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 when the pump shuts off at least 6" of fluid is left in the basin so the impeller remains submerged.
Vertical switch models have pumping differentials pre-set by a rubber stopper placed on the float rod. To reset the
pumping differential, slide the stopper to the required height to set the off position. This height Is approximately 2”
from the bottom of the float rod, or high enough that the float does not have the potential to hang up on the pump
or discharge.
PRG Series pump models with an "M" designation
are manual models with no switch. They 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. 3-phase models require the use of an approved motor control that matches motor input
in full load amperes with overload element(s) selected or adjusted in accordance with control instructions.
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 your specific
control and make the power connections per those instructions. If necessary, certain models may be run without
a separate control. 230V single-phase pumps should only be operated without the float switch by using the circuit
breaker or panel disconnect. Do not let the pump run dry.
ProVore
®
"A" and "M" models:
If the pump is to be wired directly into a control device or junction box, and it is
necessary to remove the plugs, have a certified electrician do the wiring in accordance with the National Electric
Code and applicable local codes. See Fig. 5 for direct wire installation of single phase, automatic pumps.
In 230V installations,
one side on the line
going to the pump is
always “hot”, whether
the float switch is on or
off. To avoid hazards,
install a double pole
disconnect near the
pump installation.
Figure C
– Direct wiring of 115V or 208-230V, single
phase, automatic pumps.
