280-Series
280-Series
Cast Iron
Submersible
Sump/Effluent
Pumps
1/2 hp
1-1/2" Discharge
3/4" Solids Handling
Features:
· Liberty's unique, one-piece
"Uni-Body" casting
· Quick-disconnect 10' standard
power cord allows replacement
of cord in seconds without breaking
seals to motor. (25' length optional)
· Permanently lubricated upper
and lower bearings
· Oil-filled, hermetically sealed motors
with thermal overload protection
· Stainless steel, removable bottom screen
· Stainless steel rotor shaft
· Stainless steel fasteners
115 V. Models:
280 Manual
281 Wide-Angle Float with Quick Disconnect
283 Wide-Angle Float, Series Plug
287 VMF, vertical magnetic float
(U.S. Patent #5324171)
for heavy-duty sump pump applications
208-230 V. Models:
280HV Manual
281HV Wide-Angle Float with Quick Disconnect
283HV Wide-Angle Float, Series Plug
287HV Vertical Magnetic Float (VMF) Switch
Wide-Angle Floats are mercury-free,
mechanically activated.
One-Piece Cast
Motor Housing
Quick-Disconnect
Power Cord
Patented VMF Switch
MODEL 287
Available with
Wide-Angle Switch
280 series BW 6/4/08 12:49 PM Page 1
Liberty Pumps · 7000 Apple Tree Avenue · Bergen, New York 14416 · Phone 800-543-2550 Fax (585) 494-1839
www.libertypumps.com
Copyright © Liberty Pumps, Inc. 2008
All rights reserved. LLIT 2000 R1/08
280-SERIES
1/2 hp Submersible Sump/Effluent Pumps
The Liberty 280 series provides a cost effective "mid-
range" pump for on-site waste water systems, liquid
waste transfer and commercial heavy-duty sump pump
applications that require higher head or more flow.
Designed around Liberty's unique "Uni-Body" casting,
the 280-Series will provide years of
reliable performance.
All Models Feature:
· Vortex style impeller, permitting passage of solids
up to
3
/
4
"
· 416 stainless steel rotor shaft
· Permanently lubricated upper and lower ball bearing
· Carbon and ceramic mechanical face seal
· Epoxy powder coat finish
· All fasteners corrosion-resistant stainless steel
· 1
1
/
2
" Discharge
· Stainless steel bottom screen easily removable
· Quick-disconnect 10' standard power cord allows
replacement of cord in seconds without breaking
seals to motor. (25' length optional) For 25' cord option,
add a "-2" suffix to model number. Example: 283-2 for
Model 283 with 25' cord.
· Maximum fluid temperature: 140° F.
Motor Specifications
1
/
2
hp
60 Hz
3450 RPM
Oil filled, thermally protected
115 V. Models
10 amps
208/230 V. Models
5 amps
Performance Curve: 280-Series
Dimensional Data:
Weight: 29 lbs.
Height: 13"
Major Width: 10" (model 287)
Minimum Sump Diameters:
Model 281, 283...14"
Model 287 VMF...10"
Factory switch
Model 281, 283
Model 287
settings
VMF
Turn on level
13"
9.5"
Turn off level
7"
4.0"
The Model 283 features a fully adjustable wide-angle float.
Differential adjustments can be made easily by tethering the float
to the discharge pipe or other mounting point. Vertical float model
287 is not adjustable.
Model 280
Manual,
no switch
Model 281
Wide angle
float switch
with quick-
disconnect
Model 283
Wide angle
float switch
with series
(piggy-back)
plug
Model 287
VMF-Series
Vertical mag-
netic float for
smaller pits
will operate in
a 10" diameter
sump
40
35
30
25
20
15
10
5
0
12
11
9
8
6
5
3
2
0
0
5 10 15 20 25 30 35 40 45 50 55 60 65 70
H
ead (Feet)
U.S. Gallons Per Minute
(M
eters)
Specifications are subject to change without notice.
0
.64
1.3
1.9
2.6
3.8
3.2
4.5
Liters Per Second
280 series BW 6/4/08 12:49 PM Page 2