Toastmaster, 10 Sunnen Drive, St.
IN CASEOF FIRE griddleat disconnect 1. De-energize switch.Thiswillcut off powerto theheating elementsallowing griddleto cool.This reducesthe flashpointtemperature makingit easierto stopthefire. 2. Coverthe affectedareawith a heavyblanketor canvas.Playthe fireextinguisher nozzleoverthe blanketor coverto sealoffairthussmotherino thefire. CAUTION: Do notattemptto fighta greasefireby playingthe nozzleof the fireextinguisher directlyon the buminggrease.
TABLE OF CONTENTS Description ---------------Sequenceof Operation Specifications AccessingtheGriddlefor Service 7 TemperatureControl-- 3 Calibration of TemperatureControl Heating Elemqnts RemovalandReplacement --------Thermocouples Critical Replactment- 5 8 l0 t2 13 Or/Off Switch 14 LED ------- t4 Wiring Schematics 15 2l
W. ACCESSING TIIE.GRIDDLE FOR SBRVICO throughthe front All AM Seriesgriddlesarefront serviceable.All controlsandelementsareaccessed controlpanel. thenbe unscrewed First, the greasedrawermustbe removedfrom thefront of the griddle. The panelcan fitted. CAUTION: andslid downto allow thetop lip of thepanelto dropfreeof therecessin which it is panel' The bottom of the panet is NdT ningla to the griddle.
V. TEMPERATTJRECONTROL A. Tboubleshooting Troubleshooting TheSolidStateTemperature Centrol Verifyoutputfromthe loadside of the solid statecontrol-See examplesA&Bbelow No power(0 VAC)reading existsacrossthe output terminals as in exampleA indicating a CLOSED relay. 208-24oVAC powerreading existsacrossthe output terminalsas in exampieB indicatingan OPENrelay. Checkto be surepowel is present(110-120VAC) at bothoutputterminalsof thecontrolto groundusing a volt meter.
Tfoubleshooting Cont. In the event more than one solid statecontrol fails at the sametime, the line voltage suppty to the controlis suspect.Checkfor anyblown varistorsacrossthe ouput terminalsof theControl.This is a goodindicationof a powerspikeon oneof thephaselinesto the griddle The controlis designedto operate,witha maximumheatsinktemperatureof 7fC. If the control in exceeds70oC,eitherthecontrol'sthermalcompoundhasbeenimproperlyappliedorthetemperature hasexceededmaximumambient.
VI. CALIBRATION OF TIIE POTENTIOMETER A. Ttoubleshooting Calibrationof the potentiometer is necessary only afterreplacement of thecontrolleror if thecalibrajarred plate tion shouldbecome loosefrom its factorycalibratedposition. Theallowabletemperature rangeof the gdddleis 15CPF(65'C) to 450'F(230.C)for eachzone.Within this temperaturepaftrmeterthetemperatureshouldfluctuateno morethan +14"F(j'C) from the set pointtemperature. B.
LOCATIONCHART SOURCETHERMOCOUPLE CALIBRATION 6-5/32" (ls,,/r']'ml 11-3t4" (298.4Smm) 11-3t4j (298.45mm) 11-3t4' (298.45mm) 12-114', (311.1Smm) | =ThermocoupleLocations 1-314" 11-314" (298.45mm) (298.45mm) 12-1/4J (311.1 AM36(3 FT GRTDDLE) O = Thermocouple Locations 6-5133 1-314i 12.Uq (311.
$ss Potentiometer Calibration Figure9 r$s Locationof I /2a Nut Behird Knob Note: The figure 10 below representsa temperaturegraphtakenduring the calibrationof an ANI24 Griddle. Two wavesnumbered| &2 arc the individual zonesof the 2 ft griddle. The gdddlewascalibratedat a commontemPeraturesettingof 350"F(I 75'C). A properlycalibratedgriddle will havea Stolerance of l4"F(7"C)asthe graphreveals.
VII. IIEMING ELEMENTS A. Tloubleshooting StartHere Checkfor presence of voltageto the elementandfor opencircuits. Usingan amprobe checkfor proper amp drawat leadsto element. Trackdown probablecause. Qualifyif the amps are to the griddle specifications. SeeChartFig.3. Calibibtionp_rotlern withthe control. Seecalibration seclionfor'guidance. ...=...jj Checkincoming voltage;checkcold resistanceof element. 3. ChartsFigs.,2& 8 Prob-lem:..
connections, The most commonproblemswith electricheatingelementsarc openconnections,;bad shortcircuitsor groundfaults. A groundedor shortedelementwill normallytrip a breaker. In some the groundedelementcancontinueto heatwithouttrippinga breaker. circumstances, The only way to determineif an elementis groundedor shortedis to disconnectall wires from the readingandfrorn oneleadto groundfor a shorted element.Checkacrossthe leadsfor the resistance element.
B. ElementRemoval& Replacement The elernentsare to,,bereplacedas an assemblyALWAYS! .Failureto do so will resultin uneven heatingsf the griddle surface, The elementsare specially compressedbetweenthe elementpackage box assemblyandttretop heaterplate. This providesevenheattransferto the griddle cookingsurface andthe elimination of air entrapmentbetweentheelementand heaterplate. .' An element'assembly canbe removed'throughthe front of the griddle. Refer to Figure4 belsw.
eater Assemb[y F r a m eS u p p o r t lnsulation Stand-Off Package lnsrila S t a n d - O C ov e r Cotter Pih Ng{ei The irrsulation cover and the insulation are shown as an explodedview and do not need to be removed while pivoting the element assemblY down.
\rIII. THERMOCOT]PLES , A. Troubleshooting ControlCircuit a) an openthermocouplewill inhibit the conirol from operating b) a shortedthermocouplewill causethe controlto run awaysinceit defaultsto room tempemture c) a reversedwired thermocouplewill causetheconfiol to readbackwardsandrunaway Shortingthe thermocoupleis a good way to seeif the control quickly respondsby coming on during troubleshooting.
B. Replacement When replacing the thermocouple;it is imperativethat it slides into the supporttubsand is'inser'ted tube'inlet.Refefto figure 5. Notethatthe thermocoupleswings until the transitioncrimp toucheSthe upward iirto a channelat thebottomof thegriddle surface.This enablesaccuratetemperaturesensing all theway into the supporttubewill causeinaccuof the surface.Failufeto positionthe thetmocouple rate temperaturecontrolof the gdddleandadversecookingresults.
IX. ON/OTF SWITCHES The On/Off switchis designedto handlecurrentsas higfr as 20 Amps. The cunent valuesrunning throughthe switchare very small at 12VAC. Thereforewhen checkingthe switch for continuity, it is importantto setthe ohm meteron the R x 100scale,toreadpossibleresistances up to 1.0 ohm. Any resistancereadingof 1.0ohmsor greaterwill drop the 12 VAC and-causethe controlnot to operate. Whenreplacingtherockerswitch,be surethat the switctrhasa protectivebootsurroundingits body as shownin figure6.
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