............ www.truemfg.com ............
True Food Service Equipment, Inc.
15
15
INSTALLATION / OPERATION INSTRUCTIONS
IF THE COMPRESSOR WILL NOT
RUN
)FTHEREISNOVOLTAGEATTHE
COMPRESSORTERMINALSFOLLOWTHE
WIRINGDIAGRAMANDCHECKBACKFROM
COMPRESSORTOTHEPOWERSUPPLYTO
FINDWHERETHECIRCUITISINTERRUPTED
)FPOWERISAVAILABLEATTHE
COMPRESSORTERMINALSANDTHE
COMPRESSORDOESNOTRUNCHECKTHE
VOLTAGEATTHECOMPRESSORTERMINALS
WHILEATTEMPTINGTOSTARTTHE
COMPRESSOR
)FVOLTAGEATTHECOMPRESSOR
TERMINALSISBELOWOFTHE
NAMEPLATEVOLTAGEITISPOSSIBLETHE
MOTORMAYNOTDEVELOPSUFFICIENT
TORQUETOSTART#HECKTODETERMINE
IFWIRESIZESAREADEQUATEELECTRICAL
CONNECTIONSARELOOSETHECIRCUITIS
OVERLOADEDORIFTHEPOWERSUPPLYIS
INADEQUATE
/NSINGLEPHASECOMPRESSORS
ADEFECTIVECAPACITORORRELAYMAY
PREVENTTHECOMPRESSORSTARTING)F
THECOMPRESSORATTEMPTSTOSTART
BUTISUNABLETODOSOORIFTHERE
ISAHUMMINGSOUNDCHECKTHE
RELAYTOSEEIFTHERELAYCONTACTSARE
DAMAGEDORFUSED4HERELAYPOINTS
SHOULDBECLOSEDDURINGTHEINITIAL
STARTINGCYCLEBUTSHOULDOPENASTHE
COMPRESSORCOMESUPTOSPEED
2EMOVETHEWIRESFROMTHESTARTING
RELAYANDCAPACITORS5SEAHIGH
VOLTAGEOHMMETERTOCHECKFOR
CONTINUITYTHROUGHOUTTHERELAY
COIL2EPLACETHERELAYIFTHEREIS
NOTCONTINUITY5SEANOHMMETER
TOCHECKACROSSTHERELAYCONTACTS
0OTENTIALRELAYCONTACTSARENORMALLY
CLOSEDWHENTHERELAYISNOT
ENERGIZEDCURRENTRELAYCONTACTSARE
NORMALLYOPEN)FEITHERGIVESAN
INCORRECTREADINGREPLACETHERELAY
!NYCAPACITORFOUNDTOBEBULGING
LEAKINGORDAMAGEDSHOULDBE
REPLACED
-AKESURECAPACITORSAREDISCHARGED
BEFORECHECKING#HECKFOR
CONTINUITYBETWEENEACHCAPACITOR
TERMINALANDTHECASE#ONTINUITY
INDICATESASHORTANDTHECAPACITOR
SHOULDBEREPLACED
3UBSTITUTEAhKNOWNTOBEGOODvSTART
CAPACITORIFAVAILABLE)FCOMPRESSOR
THENSTARTSANDRUNSPROPERLYREPLACE
THEORIGINALSTARTCAPACITOR
)FACAPACITORTESTERISNOTAVAILABLE
ANOHMMETERMAYBEUSEDTOCHECK
RUNANDSTARTCAPACITORSFORSHORTS
OROPENCIRCUITS5SEANOHMMETER
SETTOITSHIGHESTRESISTANCESCALEAND
CONNECTPRODSTOCAPACITORTERMINALS
A7ITHAGOODCAPACITORTHE
INDICATORSHOULDFIRSTMOVEZEROAND
THENGRADUALLYINCREASETOINFINITY
B)FTHEREISNOMOVEMENT
OFTHEOHMMETERINDICATORANOPEN
CIRCUITISINDICATED
C)FTHEOHMMETERINDICATOR
MOVESTOZEROANDREMAINSTHERE
ORONALOWRESISTANCEREADINGA
SHORTCIRCUITISINDICATED$EFECTIVE
CAPACITORSSHOULDBEREPLACED
)FTHECORRECTVOLTAGEISAVAILABLE
ATTHECOMPRESSORTERMINALSAND
NOCURRENTISDRAWNREMOVEALL
WIRESFROMTHETERMINALSANDCHECK
FORCONTINUITYTHROUGHTHEMOTOR
WINDINGS/NSINGLEPHASEMOTOR
COMPRESSORSCHECKFORCONTINUITY
FROMTERMINALS#TO2AND#TO
3/NCOMPRESSORSWITHLINE
BREAKINHERENTPROTECTORSANOPEN
OVERLOADPROTECTORCANCAUSEALACK
OFCONTINUITY)FTHECOMPRESSOR
ISWARMWAITONEHOURFORTHE
COMPRESSORTOCOOLANDRECHECK)F
CONTINUITYCANNOTBEESTABLISHED
THROUGHALLMOTORWINDINGSTHE
COMPRESSORSHOULDBEREPLACED
#HECKTHEMOTORFORGROUND
BYMEANSOFACONTINUITYCHECK
BETWEENTHECOMMONTERMINALAND
THECOMPRESSORSHELL)FTHEREISA
GROUNDREPLACETHECOMPRESSOR
)FTHECOMPRESSORHASANEXTERNAL
PROTECTORCHECKFORCONTINUITY
THROUGHTHEPROTECTORORPROTECTORS
!LLEXTERNALINHERENTPROTECTORSON
COMPRESSORSCANBEREPLACEDINTHE
FIELD
IF THE MOTOR COMPRESSOR
STARTS BUT TRIPS
REPEATEDLY ON THE
OVERLOAD PROTECTOR
#HECKTHECOMPRESSORSUCTION
ANDDISCHARGEPRESSURESWHILETHE
COMPRESSORISOPERATING"ESURETHE
PRESSURESAREWITHINTHELIMITATIONS
OFTHECOMPRESSOR)FPRESSURES
AREEXCESSIVEITMAYBENECESSARY
TOCLEANTHECONDENSERPURGEAIR
FROMTHESYSTEMREPLACECRANKCASE
PRESSUREREGULATINGVALVE
!NEXCESSIVELYLOWSUCTIONPRESSURE
MAYINDICATEALOSSOFCHARGE
/NUNITSWITHNOSERVICEGAUGE
PARTSWHEREPRESSURESCANBE
CHECKEDCHECKCONDENSERTOBE
SUREITISCLEANANDFANISRUNNING
%XCESSIVETEMPERATURESONSUCTION
ANDDISCHARGELINEMAYALSOINDICATE
ABNORMALOPERATINGCONDITIONS
#HECKTHELINEVOLTAGEAT
THEMOTORTERMINALSWHILETHE
COMPRESSORISOPERATING4HE
VOLTAGESHOULDBEWITHINOFTHE
NAMEPLATEVOLTAGERATING)FOUTSIDE
THOSELIMITSTHEVOLTAGESUPPLYMUST
BEBROUGHTWITHINTHEPROPERRANGE
ORAMOTORCOMPRESSORWITHDIFFERENT
ELECTRICALCHARACTERISTICSMUSTBE
USED
#HECKTHEAMPERAGEDRAWNWHILE
THECOMPRESSORISOPERATING5NDER
NORMALOPERATINGCONDITIONSTHE
AMPERAGEDRAWNWILLSELDOMEXCEED
OFTHENAMEPLATEAMPERAGE
(IGHAMPERAGECANBECAUSEDBY
LOWDAMAGEDEFECTIVERUNNING
CAPACITORSORADEFECTIVESTARTING
RELAY