Pitco SEH50 Service manual

L22-238Rev0(08/03)
Technical Service and Exploded Parts
For Electric Fryers
Covering Models
SEH50 Full and Split
Pitco Frialator, Inc., P.O.Box501,JctI-89&I-93Concord,NH03302-0501•509Route3A,Bow,NH03304
[phone]•[phone]•FAX[phone] www.pitco.com
FRANCAIS
US
CAN
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L22-238Rev0(08/03)
WARNING! FIRE HAZARD
THEOILLEVELSHOULDNOTFALLBELOWTHEMINIMUMINDICATEDLEVEL ATANYTIME.
THE USE OF OLD OILCAN BE DAGEROUSAS IT WILLHAVEAREDUCED FLASH-POINT
ANDBEMOREPRONETOSURGEBOILING.
WARNING
INSTALLATIONANDALLCONNECTIONSMUSTBE MADEACCORDINGTONATIONALAND
LOCALREGULATIONSAND CODES IN FORCE.
WARNING
ACOUNTRYAPPROVEDALLPOLECIRCUITBREAKERWITHAMINIMUMOPENCONTACT
GAPOF 3mmMUSTBEUSEDFORPROPERINSTALLATION.
WARNING
THEFRYERISNOTJETSTREAMAPPROVED. DONOTCLEANTHEAPPLIANCEWITHA
WATERJET.
NOTICE
INSTALLATIONSHOULDONLYBEDONE BYACOMPETENTSERVICETECHNICIAN. THE
MODEL&SERIALNUMBER,AND ELECTRICALREQUIREMENTS STAMPED INTOTHE DATA
PLATE,LOCATED ONTHEINSIDEPANELOFTHE DOOR.
NOTICE
THISAPPLIANCE IS INTENDED FOR PROFESSIONALUSEONLY,ANDAS SUCH, SHOULD
BEOPERATEDBYFULLYTRAINED PERSONNEL.
NOTICE
ITIS RECOMMENDEDTHATTHISMACHINEBEINSPECTEDBYAQUALIFIEDTECHNICIAN
ONAYEARLYBASIS.
WARNING
THEPOWERSUPPLYMUSTBEDISCONNECTEDSERVICING OR CLEANINGTHEUNIT.
WARNING
SHORTENING,WHENITISATOPERATINGTEMPERATURES,ISVERYHOTAND
DANGEROUS! USEEXTREMECAUTIONWHEN HANDLING! USE PROPER PROTECTIVE
GEAR SUCHAS INSULATED GLOVES,APRONS, FACE SHIELD,AND SLEEVES WHEN
HANDLINGHOTSHORTENING. DO NOTATTEMPTOMOVEMACHINETHATHAS HOTOILIN
IT. ALLOWTOCOOLTOROOMTEMPERATURE OR DRAINTHEOILINTOASUITABLE
CONTAINERBEFOREMOVINGTHEFRYER.

L22-238Rev0(08/03)
TableofContents
How Does It Work? ...........................................................4
Component Troubleshooting..............................................4
Temperature Probe Resistance Chart .................................4
Basic Trouble Shooting ......................................................6
Relay Board Component Explanation ................................8
Reserved for Ladder Diagram ............................................11
Reserved for Schematics....................................................12-25
Basic Parts List...................................................................27
Exploded Drawings ............................................................28-37
Element and Tank Components .........................................28
Pump Box and Drain Manifold...........................................30
Main Entrance Box .............................................................32
Pump Assembly and Filter Pan ..........................................34
Wire Harness’.....................................................................36
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4L22-238 Rev0(08/03)
Chapter 1: HOW DOES IT WORK?
The SEH 50 fryer components function in specific
order of operation. Knowing and understanding the
sequence of fryer and components operation will enable
you to diagnose equipment failure more accurately.
Heating System
Power to the machine is turned ON:
• If Fuse F1 on the Relay board is good, the A.C.
lightwillilluminate.Thecomputer is supplied with
24VAC and, if the drain valve handle is closed, the
proximity switch will supply 24 VAC to the DVI
(drain valve interlock) Input at the computer.
• The computer is turned ON:
• The side on relay will be energized, closing the
circuit and the S.O. light on the Relay Board will
illuminate. If the hi limit is NOT tripped the safety
(side on) contactor will energize.
• Computer calls for heat:
• The 24 VDC "heat demand" relay will energize
supplying the heat demand contactor with 24 VAC
and the H.D. light on the Relay Board will
illuminate. This will also supply the computer with a
heat feedback signal.
Hi Limit System:
• If the hi limit trips, it causes the side on and heat
demand contactors to lose 24VAC supply and the
heat feed back loses 24VAC. The computer will
display IGNITION FAILURE or HEAT FAIL.
After the hi limit resets (unit cools to 375°F + 20°F)
the computer will have to be turned off and back
on for the unit to heat.
Filter System:
• Opening the RED return valve handle will close the
proximityswitchcausingthe"pumprun"relayto
beenergized.Thepumpmotorwillbegintorun.
Closingthereturnvalvehandlewillde-energizethe
relayandthepumpmotor willstoprunning.
• Thepumpsystemisequippedwithacircuitbreaker
whichwillde-energizethesystem andtheheattape
in the event of overcurrent. The circuit breaker
switchmustbeintheONpositionforthepumpand
heat tape to operate.
• The return piping system may be provided with
optionalheattapetopreventsolidificationofsolid
shortening.Theheattapeislowwattage and ison
constantlytomaintainliquidshorteningintheline.
OptionalBasket Lift:
• Thebasketliftisaselfcontainedunitthatrequires
a120, 208 or240Vsupply.With mostfryercon-
figurations,thepowerissuppliedfromtheentrance
boxatthebackofthefryerbutsomecofigurations
willrequirepowerdirectfromawalloutlet.When
powerissuppliedtobasketliftassembly,thebas-
kets will lift to the up position. The baskets will
lowerwitha24VDCoutputfromthecontroller.
Chapter2:COMPONENT
TROUBLESHOOTING:
Probe:
The resistance of the probe will change as the tem-
peraturechanges.The resistance will decreaseasthe
temperature rises. The lower the temperature the
greatertheresistancechangewillbeperdegreeoftem-
perature change, as the temperature approaches the
workingrangeoftheprobe,theresistancechangewill
becomemorelinear.

5L22-238 Rev0(08/03)
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Iftheprobe is suspect,checkitsresistanceand the oil/air
temperatureatwhichitwas taken. Compare these values
onthe chart below.
Ifthe probereturns an opencircuit or 0Ohms readingit
shouldbe replaced. Iftheresistance varies morethan30
Ohmswhenbeingcheckedbetween325-375°F theprobe
willgiveafalsetemperaturereadingonthecomputerand
shouldbe calibrated(upto 10°F) orreplaced. However,
itwillcontinuetooperateataslightlyhigherorlowertem-
perature.
Allowthe oilto cool andcheck the proberesistance ata
lowertemperature.Ascanbeseenfromthechartagreater
variationcanbe tolerated atalowertemperature.
HeatDemandContactor:
Theheatdemand contactor hasa24VACcoilandwill
energizewhenthecorrectvoltageissuppliedtothecoil.
Whenenergized,thecontactswillclose,allowingcurrent
toflowthroughtheelements.Thecoilresistanceis192
ohmsoutofcircuit.
HiLimit:
The hi-limitswitchisanormallyclosedswitchuntilthe
temperatureatthe hi-limit bulbreaches425°F±20°F.
WARNING!
Thistest shouldbeperformed bya qualified
technicianonly! Monitorthefryerclosely.This
test will cause the oil to heat past the normal
operatingtemperature andcancause damageto
themachine andits operatorifcareisnot taken.
WARNING!
This test will cause the elements to heat
continuously. Remove test resistor when test is
complete. Leaving the test resistor in the fryer
couldcausedamage toequipmentand/or personal
injury.
Totest the hi-limit,usea2kΩ- 5kΩresistor tosimulate
a230°F - 275°Ftemperature.This will causethe
elementstoheatcontinuouslyuntilthehi-limittripsorthe
fryeristurnedoff.
•Ifthefryeris equipped with acomputerordigital
controller, plugtheresistorinatconnectorJ41
behindthefrontpanel.
•Ifthe fryerisequipped with asolidstate
controllerbehindthedoor, plug the resistorinat
connectorJ43behindthefront panel.
Iftheswitch does nottripbetweenthe prescribed
limitsitisdefectiveandshouldbereplaced.Once
tripped,theswitchcannotbereset until the oil has
cooledto approximately 375°F+ 20°F. If the
switchdoesnot reset afteroilhascooled it is
defective.
Oncetheoilhascooledthehi-limitresetbutton
mustbepressed to reset thehi-limitrelayonCE
andexportunitsonly.
DrainValve &ReturnValve Switches:
Theseswitchesareamagneticallyoperated
proximityswitches.WhentheDrainValvehandleis
movedtotheopenposition,theActuatorwillmove
awayfromtheswitchcausingtheswitchtoopen.
WhentheDrainValveisclosedtheswitchwill
close.
OpeningtheREDreturnvalvehandlewillclosethe
proximityswitchcausingthe "pumpon"relaytobe
energized.Thepumpwillbegintopump.Closing
thereturnvalvehandle willde-energizetherelay
andthepumpwillstoppumping. These switches
canalso be checkedwithanOhm meter.The
normalgapbetween theActuator and theSensor
switchon the valvehandleis 1/8"-1/4" (3-6mm).
Transformer:
Transformersaremultipleinputvoltage24voltoutput
voltageandcanbecheckedbyreadingtheinputand
output voltages.Aquick check for 24VAC can be
done at the relay board behind the computer. The
ACledwillbelitiftheF1fuseisgoodandtheboard
isreceiving24VAC
Elements:
EachElementhasthreecoilsinsideit,checkallelement