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
GB

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.

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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

6L22-238 Rev0(08/03)
coils out of circuit with an Ohm Meter, the resistance
should correspond to the chart below, if the resistance
varies more than 5 Ohm the element will need to be
changed.Also check for continuity to ground on each
endofthesuspectelement,thereshould be nocontinuity
toground.
208voltelements 18.5Ohms
220voltelements 20.7Ohms
240voltelements 24.6Ohms
Safety(Side On)Contactor:
CheckthecoilwithanOhmMeter,theresistanceshould
beapproximately3-6Ohms out of circuit. Ifitdoesnot
havethisresistanceitshouldbechanged.
RelayBoard:
Note:J connectors are marked on the relay board.
•With24VACsuppliedtopin#2 at connectorJ35anda
goodF1fuse,therelayboardwillhavea 24VACoutput
at pin #2 on connectors J33 and J34 and theA.C. indi-
catorwillbeilluminated.
Note: If the fryer is equipped with a computer or
solid state digital, at connection J33 there will be a
jumper from pin #2 to pin #10 to supply 24 VAC to
pin # 2 at connection J31 to supply the controller
with24VAC.
•Whentheboardreceives a 24 VDCsideoninputatpin
#7onconnectorsJ31 or J33, theS.O.indicatorwillillu-
minate,the sideon relay (S.O.)will energizeand there
willbe a24VAC output atpin #4onconnector J32.
•Whentheboard receives a24VDCheat demand input
at pin #6 on connectors J31 or J33, the H.D. indicator
willilluminate,theheatdemandrelay(H.D.)willenergize
andtherewillbecontinuitybetweenpin#1andpin#2at
connectorJ32.
ComputerControl:
Note:AllcontrollertestpointsareatconnectorP/J1(clos-
estconnectortothe controller).
•With 24 VAC supplied to pin #1(24VAC supply) and
pin#5(24VAC inputfromDVI),thedisplayshouldread
"OFF".
•With the controller turned on, there will be a 24 VDC
outputat pin #9(sideon).
•Whenthecontrollercallsforheat,therewillbea24VDC
outputatpin#8 (heat demand) anda24VACinputat pin
#6(heat feed back).Ifthecontroller does notreceivethe
24VAC input atpin#6in approximately 90 seconds,the
controllerwilldisplay"HEATFAIL"or"IGNITIONFAIL-
URE".Thiswouldindicateabreakintheheat demand or
heatfeedbackcircuit.
1.Checkthehi-limitswitch (is it openortripped).
2. Check the ignition module (sensing pilot flame,
lockedout, 24VACat MVterminal).
3. Check the heat demand relay (H.D.) on the relay
board (is heat demand relay energized, continuity
throughCOM andNOcontacts).
•Ifdisplayreads"PROBEOP""OPEN",ohmtestthetem-
peratureprobe.Checkthe wires and connectorsbetween
theprobeandcontrollerforcontinuity.
•Ifdisplay reads"SYSTEM""FAILURE", testthetem-
peratureprobeandthewires and connectors betweenthe
probeand controller forashort.
•Ifdisplayreads"DRAINING" "TURNOFF",verifythat
thedrainvalveisclosed,checktheproximityswitchonthe
drainvalve,turnthefryeroff,thenturnthefryeron.
DigitalSolidStateControl:
Note:Allcontrollertestpointsare atconnectorP/J1(clos-
estconnectortothe controller).
•With24VACsuppliedtopin#1(24VACsupply)andpin
# 5(24VAC input from DVI), the display should read
"OFF".
•With the controller turned on, there will be a 24 VDC
outputat pin #9(sideon).
•Whenthe controllercallsfor heat, thedisplay will read
"HEAt", there will be a 24 VDC output at pin #8 (heat
demand) and a 24VAC input at pin #6 (heat feed back).
Ifthecontroller does notreceivethe24VAC inputatpin
#6inapproximately90seconds,thecontrollerwilldisplay
"HEAt""FAIL".Thiswould indicate abreakinthe heat
demandorheat feed backcircuit.
1.Checkthehi-limitswitch (is it openortripped).
2. Check the ignition module (sensing pilot flame,
lockedout, 24VACat MVterminal).
3. Check the heat demand relay (H.D.) on the relay
board (is heat demand relay energized, continuity
throughCOM andNOcontacts).
•Ifdisplayreads "Prob", ohm testthetemperatureprobe.
Check the wires and connectors between the probe and
controllerforcontinuity.

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•If display reads "Prob" "HI", ohm test the temperature
probe and the wires and connectors between the probe
andcontrollerfora short.
•Ifdisplayreads"drn""tUrn""oFF",verify that the drain
valveis closed,check the proximityswitch on thedrain
valve.
PrimarySolidStateControl:
Note:Allcontrollertestpoints are at connectorP/J3(the
12pinconnectorat the controller).
•24 VAC is supplied to the controller at pin #1(24VAC
supply)and pin #5(24VAC input fromDVI),
•With the controller turned on, there will be a 24 VDC
outputat pin#9(side on) andthe green indicatorwill be
illuminated.
•Whenthecontrollercallsforheat,therewillbea24VDC
outputatpin#8(heatdemand),theyellowindicatoronthe
leftwillbeilluminatedandtherewillbea24VACinputat
pin#6 (heatfeed back).
•Whenthecontrollerreceivesthe24VACinputatpin#6,
theyellowindicatorontherightwillilluminate.Ifthecon-
troller does not receive the 24 VAC input at pin #6, the
indicatorwillnotilluminate.Thiswouldindicateabreakin
theheat demand orheatfeedback circuit.
1.Checkthehi-limitswitch (is it openortripped).
2. Check the ignition module (sensing pilot flame,
lockedout, 24VACat MVterminal).
3. Check the heat demand relay (H.D.) on the relay
board (is heat demand relay energized, continuity
throughCOM andNOcontacts).
•Ifthegreenindicatorandtheyellowindicator on the left
comeonandshutoffwhenthecontrolleristurnedon,that
indicates an open or shorted probe or wires in between
theprobeand the controller.
•Ifnoneoftheindicatorsilluminatewhen the controlleris
turnedon,verifythatthedrainvalveisclosedandthatthe
magneticproximityswitchhascontinuitywhenthedrain
valveisclosed.Alsoverifythatthereis 24VAC at pin#1
(24VAC supply)andpin #5 (24VAC inputfromDVI).
BackupSolidStateControl:
Thebackupsolid state control worksthesameasthe pri-
marysolidstatecontrol,with theexceptionofthe24VAC
supply passing through the solid state backup transfer
switchtothecomputerorsolidstatedigitalcontrol.
If the transfer switch is set to backup or if the backup
controllerhasbeenunplugged,theprimarycontroller
will not work. The jumper must be installed on the
relay board (connection J33) to allow the primary
controllerto functionifthe backupcontrolleris re-
moved.
OptionalBasket Lift:
•Thebasketliftisaselfcontainedunitthatrequires a
120,208or240Vsupply.Withmostfryerconfigura-
tions,thepowerissuppliedfromtheentranceboxat
theback of the fryerbutsome cofigurations will re-
quirepowerdirectfromawalloutlet.
•Whensupplyvoltageisappliedtothebasketliftas-
sembly,itgoesthroughavoltageselectorswitchtoa
multitap24V,80VAtransformer.Thetransformersup-
plies24VACto thedriverboard at connectionJ54.
Note:When power issuppliedto basket liftassem-
bly,thebasketswilllifttotheupposition.
•When a timer is activated, it will send a 24 VDC
signalto pin #1(24 VDC+) atconnectorJ51 onthe
driverboard.Thedriverboardwillgeneratea24VDC
output at J53 to the basket lift motor, lowering the
basket.
Note: For the purpose of testing, jumping pins #1
and#2atconnectionJ5onthedriverboardwillsimu-
latea24VDCsignalfromthecontroller,loweringthe
basket.

8L22-238 Rev0(08/03)
Fryer Trouble Shooting
PROBLEM POSSIBLE CAUSE ACTION
Computer will NOT turn ON
Display does NOT light A. No power to the machine B. F1 Fuse blown
C. T1A Transformer
A. Check building circuit breaker, verify
power cord is plugged in
B. Check F1A Fuse. Replace if defective
C. Check voltage in and out of T1A
Computer shows "IGNITION
FAILURE" or "HEAT FAIL" and
machine does NOT heat.
A. Hi limit tripped
B. Heat demand relay
C. Relay board
A. Once the oil temp has gone below
375°F + 20°, the Hi-limit should reset
automatically, if not, replace Hi-limit
B. Check & replace if defective
C. Check & replace if defective
Machine is heating slowly A. Side On contactor
B. Heat Demand contactor
C. Element
D. Loss of power on one leg of 3
phase input power
A. Check & replace if defective
B. Check & replace if defective
C. Check & replace if defective
D. Check input power. Repair or call a
qualified electrician
Oil is hotter or colder than computer
/controller displays A. Temperature calibration B. Probe
C. Probe wiring terminals
A. Adjust temperature offset up to +10°F
B. Check & replace if defective
C. Clean or repair terminals
Computer displays "DRAINING" or
"TURN OFF" A. Blue drain valve not fully closed B. Sensor switch
C. Incorrect switch gap/alignment
A. Check position of handle
B. Switch may be loose or have loose
wires, replace if defective
C. Check gap/alignment, replace if defective
Computer heat demand lights are lit,
machine does not heat. HD & SO
lights on relay board are lit.
A. Side on contactor
B. Heat demand contactor
C. Unit not getting 3 phase power
A. Check & replace if defective
B. Check & replace if defective
C. Check circuit breaker, is 3 phase power
cord plugged in all the way
Computer displays "PROBE
FAILURE" A. Shorted probe B. Open probe
C. Probe wiring terminals
A. Check probe & replace if defective
B. Check probe & replace if defective
C. Clean or repair terminals

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Filter Trouble Shooting
PROBLEM POSSIBLE CAUSE ACTION
Red return handle is pulled out, but no
pump sound can be heard A. Red return handle not completly open
B. Filter circuit breaker may be tripped
or in the off position
C. Filter motor thermal overload may
be tripped
D. Sensor switch may be loose or
defective
E. Power cord unplugged or loose
A. Pull on red return handle to make sure
valve is completly open
B. Reset the circuit breaker or press it to
the on position
C. Push the red reset button on the end of
the motor
D. Check that the switch is tight and that it
has the correct gap. Replace if defective
E. Check the power cord at the fryer
entrance box and at the pump box and
make sure that the power cords are plugged
in and /or pushed in all the way
Drain valve is closed, computer has
been reset, but computer still displays
"DRAINING"
A. Blue drain valve not fully closed
B. Sensor switch
C. Incorrect switch gap/alignment
A. Check position of handle
B. Switch may be loose or have loose
wires, replace if defective
C. Check gap/alignment, replace if defective
Oil is returning to the vat slowly or not
at all A. Dirty filter paper B. Strainer cap dirty
C. Filter pan not pushed in completely
D. O-rings not sealing on pick up tube
A. Change filter paper
B. Remove strainer cap and clean it
C. Push filter pan in
D. Check & replace if defective
Air bubbles are in the oil being returned
to the vat A. Strainer cap not tight B. Stainer cap not in pick up tube
C. Filter pan not pushed in completely
D. O-rings not sealing on pick up tube
A. Tighten strainer cap
B. Install strainer cap
C. Push filter pan in
D. Check & replace if defective
Drain valve is open, the oil is draining
slowly or not at all A. Drain valve is not fully open B. Drain line is plugged with debris A. Apply a little more pressure to the drain valve handle to check that the drain valve is
fully open
B. Use the clean out rod to clear the drain
valve opening. If this does not clear the
blockage, close the drain valve, and call for
service

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12 1
PITCO# 60127301A
DATE: MMDDYY
A.C.
H.D. S.O.
F1 FUSE
15
71
K1
HEAT
DEM ON
SIDE
K3
J32
J34
J35
J31
J33
F
use:
F1 -
Trouble Shooting Lights:
A
.C. -
S.O. -
H.D. -
Relays:
K1 -
K3 -
Connectors:
J31 -
J32 -
J33 -
J34 -
J35 -
If fuse is blown, A.C. will not be lit.
When lit, F1 Fuse and T1 Transformer are good.
When lit,A1 Computer is on and K10 Contactor should be energized.
When lit, A1 Computer is on and calling for heat, K11 Contactor should be energized
Heat Demand Relay, will be energized whenA1 Computer calls for heat and when H.D. is lit.
Side On Relay, will be energized when A1 Computer is on and A.C. is lit.
Connects to A1 Computer
To Side On and Heat Demand Contactors and Heat Feed Back.
To 24VAC jumper harness.
To Drain Switch and optional Basketlifts
Input voltage from transformer
Relay Board:
Note:
Note: If the fryer is equipped with a
computer or solid state digital, at
connection J33 there will be a
jumper from pin #2 to pin #10 to
supply 24 VAC to pin # 2 at
connection J31 to supply the
controller with 24VAC.
J connectors are marked on the
relay board.
•With 24 VAC supplied to pin #2 at
connector J35 and a good F1 fuse, the
relay board will have a 24 VAC output
at pin #2 on connectors J33 and J34
and the A.C. indicator will be
illuminated.
•When the board receives a 24 VDC
side on input at pin #7 on connectors
J31 or J33, the S.O. indicator will
illuminate, the side on relay (S.O.) will
energize and there will be a 24 VAC
output at pin #4 on connector J32.
•When the board receives a 24 VDC
heat demand input at pin #6 on
connectors J31 or J33, the H.D.
indicator will illuminate, the heat
demand relay (H.D.) will energize and
there should continuity between pin #1
and pin #2 at connector J32.
Relay Board Component Explanation