Install Instructions

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Fig. 3 – Typical Installation Duplex System
This is a recommended installation only. Variations may apply.
Fig. 2 – Typical Installation Simplex System
This is a recommended installation only. Variations may apply.
Liberty pre-assembled sewage systems come with the pump(s) already pre-mounted in the basin. The discharge pipe(s) already exit
through the cover, ready to be connected to the remaining discharge line. If you have purchased a pre-assembled system, disregard
steps A and B below.
A. Simplex (One Pump) Systems (see Fig. 2):
Set the pump in place making sure the float
has adequate clearance to the side wall of the
basin. If an optional control device or float is
used, follow the directions for mounting that
accompany the optional control. Minimum
pump turn off level should not be set below 6”.
Connect the discharge pipe to the pump's
threaded discharge. IMPORTANT: Do not
reduce the discharge pipe size below that
which is provided on the pump. Sewage
pumps should not be smaller than 2". In
some applications, it may be necessary to
increase the pipe size to reduce friction
losses. Contact Liberty Pumps or other
qualified person if you have questions
regarding proper pipe sizes and flow rates.
Mount the basin cover provided, making sure it
is properly sealed. (This is a recommended
installation. Variations may apply.)
B. Duplex (Two Pump) Systems (see Fig. 3): Set both
pumps in place in the bottom of the basin. The duplex
control used will include 3 or 4 floats that will either be
tethered to one of the discharge pipes or to an
independent rod hung from the cover. Follow the
instructions provided with your duplex control device.
Minimum pump turn off level should not be set below
6”. Make sure all floats move freely. Connect an
individual discharge pipe to each pump.
IMPORTANT: Do not reduce the discharge pipe
size below that which is provided on the pump.
Sewage pumps should not be reduced below 2". In
some applications, it may be necessary to increase
the pipe size to reduce friction losses. Contact Liberty
Pumps or other qualified person if you have any
questions regarding proper pipe sizes and flow rates.
To eliminate fluid recycling in duplex installations, it is
necessary to have a check valve on each discharge
line prior to tying the two discharges into one common
line. Depending on the height of your basin, the check
valves may either be installed inside or outside the
basin. Mount the basin covers, making sure they are
properly sealed.