MYERS SX50 Manual

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

"
"
"
xx
23833A465 10
WIRINGDIAGRAMS
FIG.6
CORDCONNECTORS
NOTE:Allcomponentsshownmustbeapprovedforhazardouslocations.