Install Instructions

8 | EN Copyright © Liberty Pumps, Inc. 2022 All rights reserved. 7034000N
Automatic Pump Direct Wiring
 In 208/230V installations, one side of 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.
If a 1-phase pump (excluding model LEH202) will be wired directly
into a control device or junction box, and it is necessary to remove
the plug, a certified electrician shall complete the wiring in
accordance with the National Electric Code and applicable local
codes. A disconnecting means for the pump shall be located in
sight from the pump/basin location. See
Figure 2 for direct wire
installation of 1-phase, automatic pumps.
Figure 2. Direct Wiring of 115 V or 208/230 V, 1-Phase, Automatic
Applications
A securable basin cover is required for safety and to prevent
foreign objects from entering the basin.
Simplex (One Pump) Systems
Figure 3. Typical Simplex System Installation (variations may apply)
1. Place pump in basin making certain the mounting interface
(i.e., guide rail, torque stop) is engaged correctly. Float switch
must have adequate clearance to side wall of basin and free,
unobstructed movement throughout its complete travel and
must not contact the pump, piping, or other objects.
2. If an optional control device or float is used, follow the
separate manufacturer’s instructions for mounting. Minimum
pump turn OFF level must not be set below
Table 1 values.
3. Connect the discharge pipe to the pump's threaded
discharge. Do not reduce the discharge to below that which
is provided on the pump. Sewage pumps should not be
smaller than 2". Larger pipe sizes may be required in some
applications to reduce friction head loss over long runs.
Contact Liberty Pumps or other qualified person if there are
questions regarding proper pipe size and flow rates.
4. Mount and seal the basin cover.
5. Install the remaining discharge line.
6. Install a union just above the cover to facilitate pump removal
when necessary.
7. Install a check valve after the union to prevent backflow after
each pumping cycle.
8. Install a gate valve after the check valve to allow periodic
cleaning of the check valve and removal of the pump.
9. The remainder of the discharge line should be as short as
possible with a minimum number of turns to minimize friction
head loss. Larger pipe sizes may be required to eliminate
friction head loss over long runs.
10. Vent basin in accordance with applicable plumbing codes.
Duplex (Two Pump) Systems
Figure 4. Typical Duplex System Installation (variations may apply)
RISK OF SERIOUS INJURY OR DEATH
Ground
Black
Junction Box
Power
Supply
Float
Switch
Pump
Green
Black
White
Green
Black
WhiteWhite
Vent
Discharge
Union Gate ValveCheck Valve
On 370-Series tanks,
use no-hub type
coupling
4” inlet pipe
On 700-Series
tanks, caulking
hub used
4” inlet pipe
Pump #1
Pump #2
Control Floats
Discharge
Vent
Unions
Inlet
Gate Valve Gate Valve
Check Valves
Leads to
Control
Panel
Tee