Friedrich Kuhl+ KEQ08A11A User Manual

49 PB
COMPRESSOR CHECKS
WARNING
ELECTRIC SHOCK HAZARD
Turn off electric power before service or
installation. Extreme care must be used, if it
becomes necessary to work on equipment with
power applied.
Failure to do so could result in serious injury or
death.
Single Phase Resistance Test
Removetheleadsfromthecompressorterminalsandsettheohmmeteronthelowestscale(Rx1).
Touchtheleadsoftheohmmeterfromterminalscommontostart(“C”to“S”).Next,touchtheleadsoftheohmmeterfrom
terminalscommontorun(“C”to“R”).
Addvalues“C”to“S”and“C”to“R”togetherandcheckresistancefromstarttorunterminals(“S”to“R”).Resistance“S”to
“R”shouldequalthetotalof“C”to“S”and“C”to“R.”
InasinglephasePSCcompressormotor,thehighestvaluewillbefromthestarttotherunconnections(“S”to“R”).Thenext
highestresistanceisfromthestarttothecommonconnections(“S”to“C”).Thelowestresistanceisfromtheruntocommon.
(“C”to“R”)Beforereplacingacompressor,checktobesureitisdefective.
GROUND TEST
Useanohmmetersetonitshighestscale.Touchoneleadtothecompressorbody(cleanpointofcontactasagoodconnection
isamust)andtheotherprobeinturntoeachcompressorterminal.Ifareadingisobtainedthecompressorisgroundedand
mustbereplaced.
Checkthecompleteelectricalsystemtothecompressorandcompressorinternalelectricalsystem,checktobecertainthat
compressorisnotoutoninternaloverload.
Completeevaluationofthesystemmustbemadewheneveryoususpectthecompressorisdefective.Ifthecompressorhas
beenoperatingforsometime,acarefulexaminationmustbemadetodeterminewhythecompressorfailed.
Manycompressorfailuresarecausedbythefollowingconditions:
 1.Improperairowovertheevaporator.
 2.Overchargedrefrigerantsystemcausingliquidtobereturnedtothe
compressor.
 3.Restrictedrefrigerantsystem.
 4.Lackoflubrication.
 5.Liquidrefrigerantreturningtocompressorcausingoiltobewashedoutof
bearings.
 6.Noncondensablessuchasairandmoistureinthesystem.Moistureis
extremelydestructivetoarefrigerantsystem.
 7.Capacitor.
CHECKING COMPRESSOR EFFICIENCY
Thereasonforcompressorinefciencyisnormallyduetobrokenordamagedsuctionand/ordischargevalves,reducingthe
abilityofthecompressortopumprefrigerantgas.
Thisconditioncanbecheckedasfollows:
 1.Installapiercingvalveonthesuctionanddischargeorliquidprocesstube.
 2.Attachgaugestothehighandlowsidesofthesystem.-
 3.Startthesystemandruna“coolingorheatingperformancetest.”Iftestshows:
  A.Belownormalhighsidepressure
  B.Abovenormallowsidepressure
  C.Lowtemperaturedifferenceacrosscoil
 Thecompressorvalvesarefaulty-replacethecompressor.
WARNING
HIGH PRESSURE HAZARD
Sealed Refrigeration System contains refrigerant
and oil under high pressure.
Proper safety procedures must be followed,
and proper protective clothing must be worn
when working with refrigerants.
Failure to follow these procedures could
result in serious injury or death.
Figure 701 (Resistance Chart)

Friedrich Kuhl+ KEQ08A11A Specifications

General

Brand	Friedrich
Model	Kuhl+ KEQ08A11A
Category	Air Conditioner
Language	English