
Operation
Liberty Pumps Single Phase Duplex control panel operates
with float switches. When all floats are in the open or OFF
position, the panel is inactive. As the liquid level rises and
closes the STOP float, the panel remains inactive until the
LEAD float closes. At this point the LEAD pump will turn
ON (if the Hand-O-Auto switch is in the AUTO mode and
the power is ON). The pump will remain ON until both the
STOP and LEAD floats return to their OFF positions. If the
liquid level rises beyond both the STOP and LEAD floats to
reach the LAG float, the lag pump will turn ON (if the Hand-
O-Auto switch is in the AUTO mode and the power is ON).
Both pumps will remain ON until the STOP, LEAD, and LAG
floats return to their OFF positions.
If the liquid level rises to reach the ALARM float, the alarm
will be activated.
Alarm System (Indicator Light and Horn)
When an alarm condition occurs, the red light and horn will
be activated.
If the TEST/NORMAL/SILENCE switch is moved to the
SILENCE position and released, the horn will be silenced.
When the alarm condition is cleared, the alarm system is
reset.
Hand-Off-Auto (HOA) Switches
The HOA 3-way switches control pump functions.
In HAND mode, the pump will turn ON.
OFF turns the pump OFF.
In AUTO mode, commands from the float switches
turn each pump ON and OFF.
Auxiliary Contact
Form C - Can be wired normally open or normally closed.
Circuit Breakers (optional)
Circuit Breakers provide pump disconnect and branch
circuit protection.
Motor Contactors
Motor contactors control pumps by switching electrical lines.
Lag Lag Lag
Alarm
Stop
Stop Stop
Alarm
Lead
Lead
Lead
Alarm
Operating
range
Installing the Float Switches
The Single Phase Duplex control panel operates with float
switches to activate pump STOP, LEAD pump START, LAG pump
START and high-level ALARM functions.
Mounting the Control Panel
1 2
3
Ensure all power is turned OFF
before installing floats in tank.
Failure to do so could result in
serious or fatal shock.
Label each float and cord end
with the provided pairs of
STOP, LEAD, LAG, and ALARM
stickers.
If the distance to the control panel exceeds the length of
the float switch cords or the pump power cord, splicing
in a liquid-tight junction box will be required. For outdoor
or wet installation, we recommend a Liberty Pumps UL
Type 4X junction box.
Make sure hose clamp
band does not interfere
with float operation.
Do not install cord under
hose clamp.
Tighten
the
clamp.
Wiring the Control Panel
1Determine conduit entrance locations on control panel as shown.
Check local codes and schematic inside the panel for the number
of power circuits required.
Be sure the pump power voltage and phase are the same as the
pump motor being installed.
2Connect the following wires to the proper terminal positions:
• incoming power
• pump 1
• pump 2
• float switches
See schematic inside control panel for details.
Technical support,
service questions:
1-800-543-2550
Monday - Friday
7:00 AM to 6:00 PM Eastern Time
?
3Verify correct operation of control panel after installation is
complete.
Type 4X conduit must be used to maintain a Type 4X rating of
the control panel.
You must use conduit sealant to prevent
moisture or gases from entering the panel.
1055158
Hose clamp is 18-8
stainless steel.
Typical Layout (May vary with options ordered).
3.5”
(9cm)
If the floats are not properly mounted and connected in the correct
order, the pumps will not function properly.
Floats require free range of motion.
They must not touch each other or any equipment in the pump chamber.
Pipe Clamp Mounting
LEAD LEAD
STOP
STOP
Copyright © Liberty Pumps, Inc. 2019 All rights reserved. Speci cations subject to change without notice. 7249000D P2
7000 Apple Tree Avenue Bergen, NY 14416
Phone 800-543-2550
Fax 585-494-1839
Web www.LibertyPumps.com
Copyright © Liberty Pumps, Inc. 2019 All rights reserved. Speci cations subject to change without notice. 7249000D P3
7000 Apple Tree Avenue Bergen, NY 14416
Phone 800-543-2550
Fax 585-494-1839
Web www.LibertyPumps.com