JABSCO 31765-0092 User manual

Dual Sensor Max™ VSD
WATER PRESSURE SYSTEM
AUTOMATIC TWO STAGE WATER SYSTEM
WITH PUMPGARD STRAINERS
IDEAL FOR PLEASURE AND COMMERCIAL BOATS WITH
HIGH DEMAND REQUIREMENTS
FEATURES
• Maintainssteadywaterflowupto9GPM(34lpm)
• Truesensorregulatedwaterpressure
• Operatesatanominal30psi(2bar)pressure
• Eliminatesneedforaccumulatortank
• Self-priming–Runsdrywithoutdamage
• CSAListed
• 93/68/EEC,IEC60335-1,89/336/EEC,
ISO8846,ISO10133:2000
• PatentPending
• Meetsfollowingstandards:
Motors meet USCG Electrical Regulation 183.410
and ISO 8846 MARINE for IGNITION PROTECTION
on gasoline powered vessels.
PRODUCT SPECIFICATIONS
Motor PermanentMagnetDCtype
 Sensorbasedelectronicspeed
 control
 Doubleballbearingarmature
Pump Positivedisplacmentdiaphragm
 type
 Fourchamberdesign
 Built-inHall-Effectpressure
 transducer
Weight 15.0lbs.(6.8kg)
GENERAL INFORMATION
TheJabscoDualSensorMaxVSDisdesignedspecificallyfor
water pressure systems in boats and recreational vehicles.
Usingstate-of-the-artelectroniccontrol.Patentpendingcir-
cuitryreducespowerconsumptionandnoiseatlowflowrates
andeliminatestheneedforabulkyaccumulatortank.Pump
cyclingandwaterhammerarevirtuallyeliminated.
• The Dual Sensor Max VSD should be wired to the power
supplythroughaswitchratedfor25amps.
TO AVOID SERIOUS OR FATAL PERSONAL INJU-
RY OR MAJOR PROPERTY DAMAGE, READ AND
FOLLOW ALL SAFETY INSTRUCTIONS IN MANU-
AL AND ON PUMP.
Warns of hazards that WILL cause
serious personal injury, death or
majorpropertydamage.
Warns of hazards that CAN cause
serious personal injury, death or
majorpropertydamage.
Warns of hazards that CAN cause
personalinjuryorpropertydamage.
Notice is used to notify people of
installation, operation, or mainte-
nanceinformationwhichisimportant
butnothazard-related.
Important: Indicates special instructions which
are very important and must be fol-
lowed.
THIS MANUAL MUST BE KEPT WITH THE PUMP.
MAINTAIN SAFETY LABELS.
DANGER
WARNING
Model Voltage Amp Draw Fuse Rating Flow Rate Regulated Cut-out Inlet
Number VDC (System) (Each Pump) GPM (lpm) Pressure Pressure Strainer

31765-0094 24 10A 7A 9GPM(34lpm) 30psi(2bar) 40psi(2.75bar) Yes
31765-00921220A15A9GPM(34lpm)30psi(2bar)40psi(2.75bar)Yes
NOTICE
MODEL 31765-0092
& 31765-0094

INSTALLATION MOUNTING
DualSensorMaxVSDsystemisself-primingandmaybelocated
up to 5 feet (1.5m) above the fresh water tank in a dry location.
Note: vertical prime can vary depending on the fluid viscosity,
suction tube size, use of a foot valve, and pump configuration.
If mounted inside an enclosure, provide adequate ventilation for
cooling.
Installfourrubbergrommetsinpumpbracketmountingholes.
TheDualSensorMaxVSDbracketisdesignedtomountona
flatsurfacewithfourmountingscrewsofadequatesize.Donot
mounttoaverticalsurface.Excessivestraincausedbyvertical
mountingmaycausefailureofthemountingbracket.Donot
overtightenmountingscrews.Rubbergrommetsactasshock
absorbers. Tighten mounting screws until rubber grommets
arepartiallycompressed.Over-tighteningcancauseexcessive
noiseandvibrationintheplumbingsystem.
PLUMBING
Useflexiblehoseandplasticfittingsofcorrectpressurerating
andcompatiblewiththefluidbeingpumped.Tubingshouldbe
aminimumof3/4”(19mm)insidediametertoprovidefreeflow
andbesecuredwithstainlesssteelclampsateachfitting.Do
notconnectpumpsdirectlytorigidpipe.Rigidpipewillamplify
pumpnoiseandmayfatigueandbreakplasticinletandoutlet
fittingscausingpumptoleak.PeriodicallycleanPUMPGUARD
strainers.Avoidkinksinflexibleplumbing.
WIRING
Consult the WIRING DIAGRAM for proper circuit connection.
The Dual Sensor Max VSD should be wired to the power
supply through a switch rated for 25 amps. An inline fuse is
factory installed in each pump to provide over current
protectiontoeachpump.Thepumpcircuitshouldnotinclude
any other electical loads. Red wire is positive. Black wire is
negative. Turn the system off when not in use for extended
periodsorwhensupplytankisempty.
IMPORTANTVSD electronics require that a battery be
installed in the DC power supply when using an AC to DC
converter or battery charging system.Electricalnoisefrom
the converter or battery charging system can interfere with
properoperationoftheVSDcircuitunlessabatteryispresent
intheDCpowersupplyasshownintheWIRINGDIAGRAM.
IMPORTANTPolarityofelectricalconnectionsisveryimpor-
tant. Insure that the RED (+) motor lead is connected to a
fusedpositiveDCcircuit. The BLACK(-)motorleadmust be
connectedtothenegativeDCcircuit.Intheeventthepolarity
isreversedontheVSDpump,thefusefoundinthe‘EMIFilter
Box’builtintotheVSDpowerwireleadsmustbereplaced.
IMPORTANT  This system should be installed by a qualified
electrician or someone familiar with applicable electrical and
safetystandards.
Use wire size according to the chart below. Total wire length
referstothedistancefromtheDCpowersourcetothepump
andbacktothepowersource.Thischartprovidesforamaxi-
mum3%voltagedrop.
WIRE SIZE TABLE
 Totalwire 0-20ft 20-30ft 30-40ft 40-60ft
 length (0-6m) (6-9m) (9-12m) (12-18m)
 Wire #10AWG #8AWG #6AWG #4AWG
 Size (6mm2) (10mm2) (16mm2) (25mm2)

Motor case will get hot during extended
operation. Prolonged contact with skin
may cause a burn.
PRE-OPERATION CHECKS
Thesupplytankshouldbeatleasthalffullpriortoinitialopera-
tion.Insureallplumbingconnectionsaresecure.Insureflexible
tubingisnotkinked.Insureallelectricalconnectionsaresecure
and in accordance with the WIRING DIAGRAM. Open all hot
and cold water faucets and fixtures. Insure that water heater
circuitisoff.
WARNING
!
Explosion hazard. Do not pump gasoline, solvents,
thinners or other flammable liquids. To do so can
cause an explosion resulting in injury or death.
FLEXIBLE
HOSE
RIGID
PIPE
WARNING
!
Fire hazard. Wiring must comply with
applicable electrical standards and include
a properly sized fuse or circuit breaker.
.
Improper wiring can cause a fire resulting
in injury or death.
Tank
Vent
Water
Tank
Tank
Fill
Faucet
Faucet
Shower
Dual Sensor
Max VSD
Check
Valve
Water
Heater
Hot Water
Line
Red (+)
(+)
On/Off
Switch
EMI
Filter Box
DC Battery
(–)
Black (–)
Inline
Fuse
TYPICAL PLUMBING SYSTEM
WIRINGDIAGRAM
When using a power supply or
converter, a battery must be in the
circuit for proper operation.
NOTICE

PARTS LIST
Key Description 31765-0092 (12V) 31765-0094 (24V)
 1 UpperHousingKitw/SensorHousing(TopPump)  18910-4028 18910-4028
 1 UpperHousingKit(BottomPump)  18910-4025 18910-4025
 2 CheckValveKit  18911-7030 18911-7030
 3 LowerHousingKit  18915-9002 18915-9002
 4 Motorw/Sensor(TopPump)  18919-0129 18919-0129
 4 Motor(BottomPump)  18919-0136 18919-1057
 5 PortClips  30648-1000 30648-1000
Notshown PumpHeadAssembly(TopPump)  18914-6038 18914-6038
NotShown PumpHeadAssembly(BottomPump)  18914-6325 18914-6325
 6 ManifoldKit  18753-0718 18753-0718
 7 BracketKit  18753-0719 18753-0719
 8 StrainerKit  46400-9500 46400-9500
 9 PortFittingKit  20381-073 20381-073
 10 PressureSwitch(BottomPump)  18916-0025 18916-0025
* ServiceKititems2,3,5  18920-9043 18920-9043
2
1
2
1
10
3 4
5
3 4
5
6.06 (154)3.50 (89)
3.88 (98) 4.25 (108)1.56
(40)
8.31 (211)10.81 (275)
8.88
(225)
EXPLODEDVIEW
DIMENSIONALDRAWING
Inches(Millimeters)
OPERATION
Switch the Dual VSD Pump System on and allow pump to
prime.Turneachfaucetandfixtureoffasflowbecomessteady
andfreeofair.Pumpshouldshutoffshortlyafterlastfaucet
is closed. If pump does not turn off automatically, check for
plumbingleaksand/orcontinuetobleedairfromplumbingsys-
tem.
Pumpisnowreadyforautomaticoperation.Itwillstartwhen
faucet(s)openandstopwhenfaucet(s)close.Ifpumpwillbe
inoperativeforanextendedlengthoftime,turnpumpcircuit
offandopenafaucetmomentarilytorelievesystempressure.
WARNING

Remove electrical power from pump
before servicing equipment.

THEPRODUCTSDESCRIBEDHEREINARESUBJECT
TOTHEJABSCOONEYEARLIMITEDWARRANTY,WHICH
ISAVAILABLEFORYOURINSPECTIONUPONREQUEST.
SERVICE AND MAINTENANCE
UseonlygenuineJabscoreplacementparts.Insurepoweris
removed from pump before service. Drain supply tank and/
or pump system dry before disconnecting liquid fittings.
Periodically clean PUMPGUARD strainers. Keep spare part
kits on hand. Adhere to a preventive maintenance schedule
andreplace‘ware’partsbeforetheendoftheirservicelife.
DISSASSEMBLY
Refertoexplodedview.
PRESSURE SENSOR OR PRESSURE SWITCH Remove
coverinitem1.OnVSDmodels,removeclipandunplugpres-
suresensor.Ondemandmodels,disconnectwireleadsfrom
terminals. Remove two mounting screws to release sensor/
switchhousinganddiaphragminfigure1.
UPPER HOUSINGRemovefourpumpheadscrewstorelease
upperhousing,item1.Inspectbackflowvalveinsensorport
for debris. Clean if necessary. Install new sealing ferrules in
upperhousingbeforere-assembly.
CHECK VALVE ASSEMBLYRemoveo-ringandcheckvalve
assemblyitem2frompumphead.Valvesshouldbecleanand
resilient.Replaceifnecessary.Alwaysreplaceo-ringseal.
LOWER HOUSING ASSEMBLYRemovesetscrewitem4in
cam bearing assembly from motor shaft using an 1/8” Allen
wrench.Toaccesssetscrew,removerubberplugfromaccess
hole in lower housing and rotate the lower housing until the
access hole and set screw are in alignment. Always replace
complete lower housing assembly including diaphragm, pis-
tons,andcambearingassembly.
RE-ASSEMBLY Re-assemble in reverse order. Rotate each
screwcounterclockwiseandthenclockwiseduringassembly
toinsurethatself-tappingscrewsengageintooriginalthreads.
Note: cutting new threads will diminish the strength of the
threadengagement.Insurethesetscrewinitem3isaligned
withindentationonmotorshaft.Tightensetscrewto35in-lbs
of torque. Tighten four piston screws to 18 in-lbs of torque.
Tightenfourpumpheadscrewsto30in-lbsoftorque.Sensor/
switch screws should be hand tight. Do not over tighten.
TROUBLESHOOTING CHART
PROBLEM/CAUSE SOLUTION
FAILURETOPRIMEORPUMP
•Debrisincheckvalveassembly Cleancheckvalveassembly
•Airleakinsuctionline Tightenallfittingsandclamps
•Restrictedsuctionline Cleanstrainerorremovekinkinsuctiontube
•Supplytankisempty Fillsupplytank
•Ruptureddiaphragm Replacelowerhousingassembly
MOTORFAILSTORUN
•Pumpcircuithasnopower Checkmainswitch,wire,fuseorbreaker
•Looseorcorrodedwireconnection Fixorreplacewireconnections
•Blownfuseoropencircuitbreaker Determinecause,resetbreakerorreplacefuse
•Openthermalprotectorinmotor Turnpowerswitchoff,allowmotortocool
•Defectivemotor,drive,orsensor Replacedefectivecomponent
PUMPFAILSTOTURNOFF
•Supplytankisempty Fillsupplytank
•Debrisincheckvalveassembly Cleanorreplacecheckvalveassembly
•Nobatteryincircuit Installbattery,replaceVSDmotor
•Leakingdischargeline Tightenorreplaceleakingfittingorpipe
•Leakingdiaphragmorpumphead Replacelowerhousingassembly
LOWFLOWORPRESSURE
•Blockedinletstrainer Cleanstrainer
•Blockedwaterfilter Replacefilterelement
•Undersizedplumbingorverylongruns Increaseplumbingto3/4”insidediameter
•Defectivemotor,drive,orsensor Replacedefectivecomponent
Jabsco is a trademark of Xylem Inc. or one of its subsidiaries.
© 2012 Xylem, Inc. 43000-0869 Rev C 6/12
www.xylemflowcontrol.com
Jabsco, 1 Kondelin Road, Cape Ann Industrial Park, Gloucester, MA 01930
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Jabsco, Bingley Road, Hoddesdon, Hertfordshire, EN11 0BU
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NHK Jabsco Co Ltd, 3-21-10, Shin - Yokohama Kohoku-ku, Yokohama 222
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Jabsco GmbH, Oststraße 28, 22844 Norderstedt
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Jabsco Italia, s.r.l., Via Tommaseo, 6, 20059 Vimercate, Milano
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