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mm

) (10mm

) (16mm

) (25mm

)



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

Fill

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

3 4

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.

www.xylemﬂowcontrol.com

Jabsco, 1 Kondelin Road, Cape Ann Industrial Park, Gloucester, MA 01930

Tel: +1 978 281 0440 Fax: +1 978 283 2619

Jabsco, Bingley Road, Hoddesdon, Hertfordshire, EN11 0BU

Tel: +44 (0) 1992 450 145 Fax: +44 (0) 1992 467 132

NHK Jabsco Co Ltd, 3-21-10, Shin - Yokohama Kohoku-ku, Yokohama 222

Tel: +81 (0) 45 475 8906 Fax: +81 (0) 45 475 8908

Jabsco GmbH, Oststraße 28, 22844 Norderstedt

Tel: +49 (0) 40 53 53 73 0 Fax: +49 (0) 49 53 53 73 11

Jabsco Italia, s.r.l., Via Tommaseo, 6, 20059 Vimercate, Milano

Tel: +39 039 685 2323 Fax: +39 039 666 307

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JABSCO 31765-0092 User manual

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