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Section C - Electrical Components
Electrical Grounding
Allrefrigeratorsareequippedwithapowersupply
cordincorporatingathree-pronggroundingplugand
agroundwirewhichisattachedtotherefrigerator
cabinetforprotectionagainstshockhazard.Each
electricalcomponentiseithercabinetmountedor
connectedthroughagroundwiretothecabinetto
completetheground.Certaincomponents,suchas
defrosttimers,maybedoubleinsulatedanddonot
requireagroundwire.
Ensuretheelectricalwallreceptacleisofthethree
prongtypeandisproperlygroundedinaccordance
withtheNationalElectricalCodeand/orlocalcodes.
Compressor Electrical Compo-
nents and Circuits on Models
with Standard Compressor
Thenewseriesofveryhighefciencycompressor
isequippedwithallnewelectricalcomponents
consistingofasolidstatePTCrelaywithathermally
operatedoverloadprotector,andaruncapacitor.
Solid State Relay
Thesolidstaterelayhasnomovingparts.It
consistsofaPTCresistormountedinaplastic
casewithappropriateterminals.PTC(Positive
TemperatureCoefcient)simplydenotesaresistor
whichincreasesinresistanceasitstemperatureis
increased.Theself-heatingPTCresistorusedin
thesolidstaterelayhastheuniquecharacteristic
ofchangingfromlowtoveryhighresistancevery
abruptly,thusservingasanon-offswitch.(See
FigureC1.)
Thesolidstaterelayplugsdirectlyontothe
compressorstartandrunterminals.Relayterminals
1,2,and5areconnectedwithintherelay,asare
terminals3and6.
Aruncapacitorisconnectedtorelayterminals2and
3,soitisconnectedinparallelwiththePTCresistor.
Onesideofthe120VACpowerisconnectedtorelay
terminal1.Theothersideoflineisconnectedtothe
overloadprotector.(SeegureC1.)
To Check/Replace Relay
1. Disconnectelectricalsupplytorefrigerator.
2. Removebalewireholdingrelaytocompressor.
3. Removerelayassemblyfromcompressor.
(SeeFigureC2.)
Figure C2
4. Usesmall,at-bladedscrewdriverto
disconnectleadstorelayassembly.
5. Useatheadedscrewdrivertogentlypry
capacitorfromrelayassembly.
6. Useohmmetertocheckresistance
betweenterminals5and6.Resistance
shouldbe3to12ohmsatnormalroom
temperature.Shortedrelaywillread0
ohms.Openrelaywillreadveryhighor
inniteresistance.
7. Ifohmreadingsareoutofrange,replace
relay.
8. Reversethisproceduretore-assemble.
Figure C1
Overload Protector
Theoverloadprotectoriscompletelythermally
operated.Itwillopenfromexcessiveheator
current.Unlikeprioroverloads,theinternalbi-
metalisnotself-heating,andisnotapartof
theelectricalcircuit.Theoverloadhasasmall
built-incoilheaterthatisinserieswiththe
compressorstartandrunwindings(SeeFigure
C1).
NOTE
WhenreplacingleadstothePTCrelay,ensure
lockingtabssnapintoterminal.