Product Manual
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True Food Service Equipment, Inc.
27
27
INSTALLATION / OPERATION INSTRUCTIONS
4.Ifalloperatingconditionsarenormal,
thevoltagesupplyatthecompressor
terminalsbalancedandwithinlimits,the
compressorcrankcasetemperaturewithin
normallimits,andtheamperagedrawn
withinthespecifiedrange,themotor
protectormaybedefective,andshould
bereplaced.
Iftheoperatingconditionsarenormal
andthecompressorisrunningexcessively
hotfornoobservablereason,orifthe
amperagedrawnisabovethenormal
rangeandsufficienttorepeatedlytripthe
protector,thecompressorhasinternal
damageandshouldbereplaced.
IF THE COMPRESSOR RUNS
BUT WILL NOT REFRIGERATE
1.Checktherefrigerantcharge.Check
theevaporatorsurfacetodetermine
ifitisevenlycoldthroughout,orif
partiallystarved.Alackofchargemay
beindicatedbylight,fluffyfrostat
theevaporatorinlet.Addrefrigerantif
necessary.
2.Checkthecompressorsuction
pressure.Anabnormallylowpressure
mayindicatealossofrefrigerantcharge,
amalfunctioningcapillarytube,alackof
evaporatorcapacitypossiblyduetoicing
orlowairflow,orarestrictioninthe
system.
Oftenarestrictioninadrierorstrainer
canbeidentifiedbyfrostoradecrease
intemperatureacrosstherestrictiondue
tothepressuredropintheline.Thiswill
betrueonlyifliquidrefrigerantisin
thelineattherestrictedpoint,sinceany
temperaturechangeduetorestriction
wouldbecausedbytheflashingofliquid
intovaporasthepressurechanges.
Anyabnormalrestrictioninthesystem
mustbecorrected.
3.Checkthecompressordischarge
pressure.Anabnormallyhighdischarge
pressurecancausealossofcapacity,and
canbecausedbyadirtycondenser,a
malfunctioningcondenserfan,orairin
thesystem.
4.Ifthesuctionpressureishigh,
andtheevaporatorandcondenser
arefunctioningnormally,checkthe
compressoramperagedraw.Anamperage
drawnearorabovethenameplaterating
indicatesnormalcompressororunitmay
havedamagedvalves.
Anamperagedrawconsiderablybelow
thenameplateratingmayindicate
abrokensuctionreedorbroken
connectingrodinthecompressor.
IF THE MOTOR COMPRESSOR
STARTS BUT TRIPS
REPEATEDLY ON THE
OVERLOAD PROTECTOR
1. Defrost Time Clock
A. Checktimermotortobe
sureitruns.
B. Checkcontactsonthe
defrosttimer.
C.Checksolenoidwindings
forcontinuitytoensure
contactswitching.
D.Checktobesuredefrost
actuatorpinsareinproper
position.
E. Checkallwiresinthetimer
fortightnesstoterminalsand
brokenwires.
2. Defrost Control On The
Evaporator Drain Pan
A.Ifthedefrosttimeisalways35
minutes(orwhateverdurationthe
elapsedtimeadjustmentissetat)and
thefanmotorsdonotdelayaftera
defrostcycleandithasbeendetermined
thatthesolenoidinthedefrostclockis
functioning,changethedefrostcontrol
intheevaporatorcompartmentin
thetopofthefreezer.Thiscontrolis
attachedtotheevaporatordrainpan.
3. Coil Defrost Heater
A.Lowertheevaporatorcover.
Disconnectthecoilheaterbyremoving
thewirenutsatthepointwherethe
heaterjoinstheelectricalcircuitofthe
freezerintheevaporatorcompartment.
Checkheaterforcontinuitywithan
ohmmeter.Iftheheaterisdefective,cut
thebalewiresholdingtheheatertothe
coilandremovetheheater.Replacewith
anewheaterusingbalewiresprovided.
4. Drain Tube Heater
A.Lowertheevaporatorcover.
Disconnectthedraintubeheaterby
removingthewirenutsatthepoint
wheretheheaterjoinstheelectrical
circuitofthefreezerintheevaporator
compartment.Checkthedraintube
heaterwithanohmmeter.
B.Ifthedraintubeheateris
defective,disconnectthedraintubefrom
therigidplasticdrain,bendthetabsthat
holdtheevaporatordrainpantothe
evaporatorcoverandraisethedrainpan
sothattheflexibleheaterisvisible,pull
heateroutoftheplasticdraintubeand
replace.Connectheatertotheelectrical
circuitintheevaporatorcompartment.
5. Cabinet Temperature Control
A.Removethetwoscrewson
therightsideoftheevaporatorhousing
thatholdsthecontrolmountingplate.
Reachbehindtheevaporatorhousingon
thecontrolsideofthecabinetandpull
thecontrolbulboutofthereceptaclein
theroofofthecabinet.Disconnectthe
wiresfromthecontrol.Checkcontrol
forcontinuity,replaceifdefective.