MYERS SX50 Manuel

23833A465 03/10

SX50/SX50H

Sump Pumps

Used in Hazardous Locations Class 1, Division 1, Group D

Installation and Service Manual

GENERAL

 1. Mostaccidentscanbeavoidedbyusing

  COMMON SENSE.

 2. Readtheoperationandmaintenance

instructionsmanualsuppliedwiththepump.

 3. Donotwearlooseclothingthatcanbecome

entangledintheimpellerorothermoving

parts.

 4. Thispumpisdesignedtohandlematerialsthat

couldcauseillnessordiseasethroughdirect

exposure.Wearadequateprotectiveclothing

whenworkingonthepumporpiping.

ELECTRICAL

 5. Toreducetheriskofelectricalshock,pump

mustbeproperlygroundedinaccordancewith

theNationalElectricCodeandallapplicable

stateandlocalcodesandordinances.

 6. Toreduceriskofelectricalshock,disconnect

thepumpfromthepowersourcebefore

  handlingorservicing.

 7. Anywiringtobedoneonpumpsshouldbe

donebyaqualiedelectrician.

 8. Neveroperateapumpwithapowercordthat

hasfrayedorbrittleinsulation.

 9. Neverletcordsorplugslieinwater.

10. Neverhandleconnectedpowercordswith

  wethands.

PUMPS

11. Pumpbuildsupheatandpressureduring

operation;allowtimeforpumptocoolbefore

handlingorservicing.

12. Onlyqualiedpersonnelshouldinstall,

 operateorrepairpump.

13. Keepclearofsuctionanddischargeopenings.

DONOTinsertngersinpumpwithpower

connected.

14. Donotpumphazardousmaterialnot

recommendedforpump(ammable,

 caustic,etc.).

15. Makesureliftinghandlesaresecurely

 fastenedeachtimebeforelifting.

16. Donotliftpumpbythepowercord.

17. Donotexceedmanufacturer's

recommendationformaximumperformance,

asthiscouldcausethemotortooverheat.

18. Securethepumpinitsoperatingpositionsoit

cannottipover,fallorslide.

19. Keephandsandfeetawayfromimpellerwhen

powerisconnected.

20. Submersiblesumppumpsarenotapproved

foruseinswimmingpools,recreationalwater

installations,decorativefountainsorany

installationwherehumancontactwiththe

pumpeduidiscommon.

21. Donotoperatepumpwithoutsafetydevices

 inplace.

22. Forhazardouslocations,usepumpsthatare

listedandclassiedforsuchlocations.

IMPORTANT! Myersisnotresponsiblefor

losses,injuryordeathresultingfromafailure

toobservethesesafetyprecautions,misuseor

abuseofpumpsorequipment.

GENERALINFORMATION

PumpModels:Theseinstructionscoverthe

installationandserviceoftheMyersSX50and

SX50Hseriessubmersiblesumppumps.The

motorsareCSAlistedforhazardoussewage

locationsClass1,Div.1,GroupD.

MotorHP&Voltages:TheSX50/SX50Hsump

pumpsareofferedinsingleandthreephase.

Voltageswillvaryaccordingtotheapplicationand

canbeseeninthetablesinthismanual.

ElectricalControls:Allofthesepumpmodelsmust

beusedwithacontrolpanel.Myersbuiltcontrol

panelsaredesignedtosupplythecorrectelectrical

controls,motorstartingequipmentandinclude

thecircuitryformoistureandheatsensors.Itis

recommendedthataMyersbuiltcontrolpanelbe

usedsothatallwarrantiesapply.

GeneralConstruction:TheSX50/SX50Hmotor

constructionisdesignedtomeetCSArequirements

forClass1,GroupDsewageapplications.These

modelsareapprovedandnameplatedwithaCSA

lenumber.Acrosssectionalviewoftheinternal

workingsofthepumpscanbeseenonpages7and

8.Themotorchamberandsealchamberarelled

withahighdielectrictypeoilforimprovedlubrication

andheattransferofthebearingsandmotor.Since

thebearingshavebeendesignedfor50,000hours

oflife,theoilshouldneverrequirereplacement

23833A465 2

WARNING!IMPORTANTSAFETYINSTRUCTIONS!READCAREFULLYBEFORE

INSTALLATION.Thismanualcontainsimportantinformationforthesafeuseofthis

product.Readthismanualcompletelybeforeusingthisproductandrefertoitoften

forcontinuedsafeproductuse.DONOTTHROWAWAYORLOSETHISMANUAL.

Keepitinasafeplacesothatyoumayrefertoitoften.

undernormaloperatingconditions.Anairspace

abovetheoillevelinboththesealandmotor

chambersisprovidedtoallowfortheexpansionof

theoilwhenatoperatingtemperature.Thepower

andcontrollinesaresealedandstrainrelievedon

theoutsideentrancewithastandardcordgrip,and

internallythroughtheuseofadielectricpottingresin

surroundingtheelectricalwires.

Internalconnectionwiringdiagramsareshownin

Figure8.Allofthepumpfastenersandshaftsare

madefromcorrosionresistantstainlesssteel,while

thepumpcastingsaremadeofASTMA-48Class

30castiron,andthemultivanevorteximpellersare

madefromClass20castiron.

GeneralInstallation:Variouscongurationsand

methodsofplumbingthisseriesofsumppumpsmay

beused.

Note:IftheSX50/SX50Hhazardouslocation

pumpsareusedinconjunctionwitharaillift-out

system,itmustbeaULorCSAlistednonsparking

systemforhazardouslocations.

IMPORTANT:Ifthefollowingguidelinesare

notfollowed,theCSAhazardouslocationlisting

isvoid.

Thesepumpsaretobeusedforhandlingseptictank

efuent,sewage,andstormwateronly.Do notuse

inotherhazardouslocations.Thesemotorsmust

berepairedandservicedonlyataMyersauthorized

servicecenterorattheMyersfactory.Any

unauthorizedeldrepairvoidswarrantyandthe

hazardouslocationrating.

CAUTION:Afterthepumpisinstalledand

sewagehasenteredthebasinthereisDanger.

Sewagewatergivesoffmethaneandhydrogen

suldegases,whicharepoisonous.Never

enterawetwellunlessthecoverisopenfora

sufcientperiodoftimetoallowfreshairinto

thebasin.Itisrecommendedthatamanin

thebasinhaveaharnessonwitharopetothe

surface,sothathecanbepulledoutincaseof

asphyxiation.ItisforthisreasonthatMyers

recommendsusingtheraillift-outsystemsothat

noserviceisrequiredinsidethebasin.

Motor:Eachmotorisprovidedwithheatsensor

thermostatsattacheddirectlytothemotorwindings.

Thethermostatsopenifthemotorwindingssee

excessiveheatand,inturn,openthemotor

contactorinthecontrolpanel,breakingthepower

tothepump.Whenthemotorisstoppedduetoan

overheatcondition,itwillnotstartuntilthemotorhas

cooledandtheheatsensorresetbuttonismanually

pushedonthefrontoftheMyerscontrolpanel.

ThiscircuitryisprovidedintheMyerscontrolpanel

designs.

TheSX50/SX50Hpumpsareequippedwith

internalthermostats.TheSX50/SX50Hmodels

aredesignedtomeetClassBheatriseof266°F

(130°C).

Note:Failuretousepropercircuitryandtoconnect

themotoroverheatprotectioninthecontrolpanel

wouldnegateallwarrantiesandCSAListings.

MotorSealFailureWarning:Thesealchamberis

oillledandprovidedwithmoisturesensingprobes

todetectwaterleakagethroughthelowershaftseal.

Theprobescanalsodetectmoisturepresentinthe

uppermotorhousing.

Thepresenceofwaterenergizesaredsealleak

warninglightatthecontrolpanel.Thisisawarning

lightonly,anddoesnotstopthemotor.Itindicates

aleakhasoccurredandthepumpmustberepaired.

Normally,thisindicatestheoutboardsealhas

leaked.Allowingtheunittooperatetoolongafter

thewarningcouldcauseuppersealleakagealong

withmotorfailure.

Theresistanceacrossthemoisturesensing(seal

failure)probesshouldbecheckedafteraseal

leakwarninglighthaslit.Thiscanbedoneby

disconnectingtheredandorangecontrolwiresfrom

thecontrolpanel,andmeasuringtheresistancewith

anohmmeterbetweenthewires.TheSX50/SX50H

readingshouldbeabove30,000ohms.Ifthe

measuredvaluesarebelowthoseindicatedabove,

thepumpmayhavealowersealfailureand

requireservice.

OntheMyerscontrolpanelsthesealleaktestswitch

teststhesealleakcircuitcontinuity.Whenpushed

thesealleaktestbulbshouldlight.Ifthetestbulb

doesnotlightitmeanseitherthewiringcircuitryto

thesealleakprobeshavebeenbrokenorthebulb

hasburnedout.

Note:Myersbuiltcontrolpanelssupplythecorrect

circuitryformoistureandheatsensorconnections.

Failuretoinstallthecorrectcircuitrywithproper

connectionwouldnegatewarrantyandCSAListing.

SeeFigure7.

MotorPowerCord,ControlCordandCord

CapAssembly:Eachmotorpowercordhas4

conductors–white,black,redandgreen.Fora

singlephasemotortheblackisconnectedtothe

commonlead,thewhiteisconnectedtothemain

lead,whiletheredisconnectedtothestartcircuitry,

andthegreenisattachedtoagoodground.The

23833A4653

rotationofasinglephasepumpissetproperlyatthe

factory.

Forthreephasemotor,theblack,white,andred

conductorsarepowerleadsandthegreenisground.

Note:Rotationshouldbeclockwisewhenobserved

fromthetopofthepump.Thiscanbecheckedby

notingwhichdirectionthepumptorquesuponinitial

starting.Aproperlyrotatingpumpwilltorque

counterclockwiseuponstart.

ALWAYSCHECKTHREEPHASEPUMPS

FORPROPERROTATIONBEFORE

INSTALLINGPUMPS.

Thecontrolcablehas5conductors–black,white,

red,orangeandgreen.Whiteandblackconnect

totheheatsensorterminalsinthecontrolpanels;

redandorangeconnecttothesealfailureterminals

inthecontrolpanel;andthegreenconnectstothe

groundinthecontrolpanel.

Thecordcapisepoxypotted.Thisallowsthecord

cap,withcords,toberemovedfromthemotor.With

thisarrangement,thecordscanbepermanently

installedinasealedttinginthesump.This

shouldbeanapprovedjunctionboxforthespecic

hazardouslocations.The control and power

cables cannot be spliced!

Note:Eachcablehasagreengroundwireand

mustbeproperlygroundedpertheNationalElectric

Codeandlocalcodes.

ElectricalMotorControls:Allelectricalcontrols

andmotorstartingequipmentshouldbeasspecied

intheseinstructions.Consultfactoryforany

acceptablealternatives.Forhazardouslocationsthe

controlsandcontrolpanelmustbeinstalledoutside

thehazardousarea.Onlyapprovedcontrolsthatare

intrinsicallysafemaybeusedwiththesepumps.

JunctionBox:Ifajunctionboxisusedina

hazardouslocation,itmustbeanapprovedtype

withapprovedcordconnectors.Wiresfromthe

junctionboxmustpassthroughanapprovedseal

connectorforhazardouslocations.

LevelSensingControls:Intrinsicallysafe-type

oatcontrolsarerecommendedforallapplications

andrequiredforhazardouslocations.Anintrinsically

safecontrolpanelrelaywilllimitthecurrentand

voltagetothelevelcontrols.AMyerscontrolpanel

canbesuppliedwiththistypecircuitry.

Theoatlevelcontrolsmaintainthebasinsewage

waterlevelbycontrollingpumpturn-onand

turn-offlevels.

1. Thelowerturn-offcontrolshouldbesetsothat

thepumpstopswiththewatercoveringtheentire

motorhousing.Consultthefactoryforany

 settingsbelowthispoint.

2. Theupperturn-oncontrolshouldbesetabove

thelowerturn-offcontrol.Theexactheight

 betweenthetwocontrolsisdeterminedbythe

numberofpumpstartsdesiredandthedepth

ofthebasin.Amaximumof10startsperhour

shouldnotbeexceeded.

3. Theoverridecontrolissetataspeciedheight

abovetheupperturn-oncontrol.

4. Thealarmcontrolissetabout6"to12"abovethe

overridecontrol.

5. Nocontrolshouldbesetabovetheinletinvert.

ElectricalConnections:Allelectricalwiringmust

beinaccordancewithlocalcodeandonlyqualied

electriciansshouldmaketheinstallations.Complete

wiringdiagramsareincludedforuseinmakingthe

installation.Allwiresshouldbecheckedforshorts

togroundwithanohmmeterormeggerafterthe

connectionsaremade.Thisisimportant,asone

groundedwirecancausefailureofthepump,control

panelorpersonalinjury.

Pump:Theuidendofthepumpiseldserviceable

andcanbedisassembledincaseofwear,damage,

pluggingoroutboardsealfailure.Thefollowingwill

describethedisassemblyandreassemblyprocess.

WARNING!Disconnectpumpfrompowersource

beforeservicingorhandling.

Disassembly

1. Withthepumplocatedinasecureplace,remove

theboltsfasteningthesealhousingtothevolute.

Themotorandimpellercannowberemovedas

 aunit.

2. Laytheunitdownonitsside.Ifthelowersealis

toberemoved,itisrecommendedthattheoilin

thesealchamberbedrained.Thiscanbedone

byremovingthelowersealchamberplugand

drainingtheoilintoaholdingcontainer.

23833A465 4

3. Usingaproperwrench,theimpellerretaining

nutmustberemoved.Thismayrequireapiece

ofwoodplacedbetweenthevanestokeepthe

impellerfromrotatingwhileremovingthenut.

 Loctite®isusedonthisboltandheatingto

450–500°Fmayalsoberequiredtoloosen.The

impellerismountedonathreadedshaft.To

removeimpeller,rotateimpellerwithonehand,

whileholdingpumpshaftwithscrewdriver.

4. Ifthelowersealneedstoberemoved,rst

removethecompressionspringthatrides

betweentheimpellerandthesealassembly.

Nexttakeapairofscrewdriversandremove

thecompressionringthatsurroundstherubber

bellowsontherotatingportionoftheseal

assembly.Againusingthescrewdrivers,prythe

remainingportionoftherotatingsealassembly

offtheshaft.Theceramicstationarycanbe

removedbyplacingascrewdriverbetweenthe

rubberandtheceramicface,andthenprying,

workingaroundtheentirediameter.Note,

thesepartsshouldbediscardedandanewseal

assemblyinstalled.

5. Iftheoilinthesealchamberwasdrained,

examinethecontentstodetermineiftheupper

sealhasbeendamaged.Signsofgritorother

abrasivematerialmayindicatethattheupper

sealhasalsobeendamaged.Pressurizingthe

motorhousingassemblybetween7and10psi

andobservinganydropinpressurewillindicateif

theuppersealisfunctioningproperly.

Note:UppersealrepairsmustbedoneataMyers

authorizedservicecenterorattheMyersfactory.

Anyunauthorizedeldrepairvoidswarrantyandthe

CSAlisting.

Reassembly

1. Removetheceramicportionofthenewsealfrom

thepackage.Brushnewdielectricoilaroundthe

rubberportionofthestationaryassemblyandinto

thepocketinthesealhousing.Note,keepthe

oiloffthesealface.Withoutscratchingtheseal

face,presstheceramicstationaryportionintothe

sealhousing.ApieceofPVCpipethattsonto

thefaceofthesealworkswellforinstallation.

Withcleancloth,lightlywipethefaceoftheseal

surfacetomakesureitisdirtfree.Removethe

rotatingportionofthesealfromthepackageand

lubricatetheinsidediameteroftherubberbellows

andtheoutsidediameteroftheshaft.Placethe

sealovertheshaft.Evenlypressonthebody

oftherotationalassemblyandslideitdownthe

shaftuntilthesealfacesmeet.APVCpipewith

theinsidediameterslightlylargerthantheshaft

diametercanworkwelltopresstherotational

assemblyintoposition.Oncethesealassembly

isinposition,placethespringovertheregisteron

therotationalportionoftheseal.

2. Threadtheimpellerontotheshaft,makingsure

thatthesealspringisregisteredproperlyonto

thebacksideoftheimpeller.Placetheproper

Loctiteuidontheimpellerretainingnut.Tighten

nutonshaft.

3. Fillthesealchamberwithnewdielectricoil.An

airgapof10–15%volumemustbeleftforthe

expansionoftheoilwhenitisatoperating

 temperature.

4. Themotorandimpellerassemblycanbeinstalled

intothevolute,makingsurethattheunitsare

alignedproperly.Installthevoluteretainingbolts

andtighten.

5. Airtendstotrapinthepumpcasewhenwater

risesinthesumporwhenthepumpislowered

intothewaterafterservice.Toventoffthisaira

smallholeisdrilledintothevolutecasting.Be

sure this vent hole is clean after any service

work on pump.Airventingisnotaproblemafter

initialstart.

23833A4655

SX50DIMENSIONS

[Dimensionsinmm]

SX50HDIMENSIONS

[Dimensionsinmm]

FIG.1

23833A465 6

SX50PUMPPARTS

FIG.2

23833A4657

SX50HPUMPPARTS

FIG.3

23833A465 8

SX50/SX50HPARTSLIST

23833A4659

Ref. Description Qty. SX50 SX50H

1 CAP, CORD 1 22407C602 22407C602

2 CONNECTOR 7 12762A001 12762A001

3 TUBE, PLASTIC x 1-1/4" LG. 2 10649A102 10649A102

4 SCREW, CAP 5/16 x 1-1/4" LG. 8 19100A012 19100A012

5 O-RING, 4-1/2" x 4-1/4" x 1/8" 1 05876A122 05876A122

6 CAP, UPPER BEARING 1 21570B100X 21570B100X

7 O-RING, 4-7/8" x 4-5/8" x 1/8" 1 05876A123 05876A123

8 PLUG, PIPE 1/4" NPT 2 05022A054 05022A054

9 SCREW, MACH. #10 x 1/2" LG. 1 05434A034 05434A034

10 WASHER, LOCK 1 06107A015 06107A015

11 SCREW, MACH. 5/16 x 1" LG. (SX50) 2 07597A017

11 SCREW, MACH. 5/15 x 1" LG. (SX50H) 6 07597A017

12 HOUSING W/STATOR (1Ø) 1 21571D150K 21571D150K

HOUSING W/STATOR (3Ø) 230/460V 1 21571D152K 21571D152K

HOUSING, MOTOR 21571D100X 21571D100X

STATOR ONLY (1Ø) 21656C103 21656C103

STATOR ONLY (3Ø) 230/460V 1 21656C106 21656C106

13 OIL, TRANSFORMER (1 GAL. CAN) 1.06 gal. 11009A008K 11009A008K

14 WASHER, SPRING 2 19331A005 19331A005

15 BEARING, BALL (UPPER) 1 08565A013 08565A013

16 RING, RETAINING 1 11816A006 11816A006

17 ROTOR W/SHAFT (1Ø) 1 26859C101X 26859C101X

ROTOR W/SHAFT (3Ø) 1 26859C104X 26859C104X

18 BEARING, BALL (LOWER) 1 08565A018 08565A018

19 HOUSING, UPPER SEAL 1 21574D100X 21574D100X

20 SEAL, SHAFT 2 21576A010 21576A010

21 RING, RETAINING 1 12558A006 12558A006

22 ELECTRODE W/RESISTOR 1 22578A003 22578A003

23 O-RING, 6-1/8" x 5-7/8" x 1/8" 2 05876A125 05876A125

24 FERRULE, RUBBER 1 22579A000 22579A000

25 PLUG, SPECIAL 1 21577A000 21577A000

26 HOUSING, LOWER SEAL 1 21578C110X 21578C115X

27 SCREW, CAP 5/16 x 1" LG. 4 06106A008 -----

28 CASE, VOLUTE 1 21612D000 26226D012

29 SCREW, CAP 1/4 x 1" LG. 3 19099A012 19099A012

30 IMPELLER, RECESSED 1 21663C020 21663C010

31 NUT, JAM 1 19109A070 19109A070

32 SCREW, SET 2 05013A027 05013A027

Available Models Motor Electrical Data

Standard HP Volts Phase Hertz Start Amps Run Amps

Service Factor

Amps NEC Code Letter Service Factor

SX50-21 ½ 230 1 60 12.5 4.9 5.9 H 1.2

SX50H-21 ½ 230 1 60 12.5 4.9 5.9 H 1.2

SX50-23 ½ 230 3 60 10.8 3.2 4.0 G 1.25

SX50H-23 ½ 230 3 60 10.8 3.2 4.0 G 1.25

SX50-43 ½ 460 3 60 5.4 1.6 2.0 G 1.25

SX50H-43 ½ 460 3 60 5.4 1.6 2.0 G 1.25

SX50/SX50H

MOTOR ELECTRICAL DATA

23833A465 10

WIRINGDIAGRAMS

FIG.6

CORDCONNECTORS

NOTE:Allcomponentsshownmustbeapprovedforhazardouslocations.

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