\rIII. THERMOCOT]PLES

, A. Troubleshooting

ControlCircuit

a)anopenthermocouplewill inhibittheconirolfrom operating

b)a shortedthermocouplewill causethecontrolto run awaysinceit defaultsto roomtempemture

c)a reversedwiredthermocouplewill causetheconfiolto readbackwardsandrunaway

Shortingthe thermocoupleis a goodway to seeif the controlquickly respondsby comingon during

troubleshootingSince. shortingthethermocoupleis thesameasbridgingthecircuit,it will defaultto room temperatureandnaturallycall for heatif thepotentiometeris setat a highertemperatureWhen.perform- ing thisvery brief TEST,besureto removettrreshortfrom thecircuit beforeplacingthegriddlebackinto service.

ThefollowingchartliststheTypeKthermocouplemillivoltreadingfrom200"F(93"C)to 500"F(26trC).

GriddleTemperature

Junction 200eF 300eF 400eF 500eF

Temp (93rC) (149sC) 204ec) (260ec)

90eF(32rC) 2.s2 4.80 7.02 9.27

85eF(29e 2.U 4.91 7 . 1 3 o ? a

SorF(zFC) 2.75 5.02 725 9.49

7seF(24eC) 2.86 5 . 1 4 7.36 9.60

70eF(24eC) 2.98 5.25 7.47 9.72

65e(18eC) 3.09 5.36 t . c 69.83

60eF(16eC) 3.2A 5.47 7.69 9.94

Example:Thethermocouplemillivolt readingat 300'F(149"C)with ajunctiontemperatureof 85.F(29.C) shouldbe4.91mV.

At roomtemperaturegoodthermocouplewill readbetween5-8ohms.

Coldresistancereading:6.5OHMSaverage.

t2

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Toastmaster AM24, AM36, AM48 manual GriddleTemperature

AM48, AM24, AM36 specifications

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