SPECIFICATIONS
Model number:
. . . . . . . . . . . . . . . . . . . . .31777-0000
Voltage:
. . . . . . . . . . . . . . . . . . . . .12 or 24 VDC input
Amps:
. . . . . . . . . . . . . . . . . . . . . . . . .12 amps at 12 V
6 amps at 24 V
Flow Range:
. . . . . . . . . . . . . . . . . .Depends on pump
Size:
. . . 4.7”(115 mm) x 3.4”(85 mm)x 3.0”(73.5 mm)
Weight:
. . . . . . . . . . . . . . . . . . . . . . . .8.2 Oz (0.23 Kg)
Model 31777-0000
12/24 VDC Pump Controller
Variable Speed Drive (VSD)
SMOOTH-FLOW™
WATER SYSTEM CONTROLLER
Variable Speed Drive (VSD) converts everyday pumps into
sensor-controlled pumps that automatically adjust in real
time to changes in pressure. As less flow is required, the
pump motor slows down to provide a smooth and
pulsation-free performance.
FEATURES
• Provides smooth and quiet water flow without pulsation
(water hammer)
• Eliminates temperature variation
• Eliminates need for space consuming accumulator tank
• Works on most water pressure pumps rated 3-12 amps
• Easy-to-install; hose and fittings included
• Runs on 12 or 24 VDC input
HOW IT WORKS
The controller automatically measures the pressure at
which the pump’s pressure switch opens. It uses this
measurement to determine an optimal running pressure
for the given pump, and stores the value in its memory
for consistency between power cycles.
Compatible Pump Requirements:
• Diaphragm pumps with 3, 4 or 5 pumping chambers.
• 12 or 24 VDC.
• 12 amp maximum at 12 Volts.
• 6 amp maximum at 24 Volts.
• 3 amp minimum pump rating.
• MPU pressure switch rating: 30 to 65 psi.
• Motor voltage must match system voltage.
• Not compatible with Flojet 4405 and Jabsco
31295/31395 Series pumps.
INSTALLATION & SERVICE INFORMATION
4.60
2.94
3.41
(115)
(73.5)
(85.25)
DIMENSIONAL DRAWING
Dimensions in inches (millimeters)
®
This product is to be used for potable water system applications only. Use
with any other medium, including particularly hazardous, flammable, caustic
or corrosive substances, could result in damage to the unit, the surrounding
environment and injury to persons or property, including possible exposure
to hazardous substance.
WARNING
