valutazioni - 3, GPA: 3.7 ( )

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If the oven control indicates a temperature reading but the oven will not heat, proceed. Thermocouple WITH POWER ON AND THERMOCOUPLE ATTACHED TO THE OVEN CONTROL: Measure the DC millivolt output of the thermocouple. Refer to the thermocouple chart (located in the “Removal” section of the manual) for proper millivolt readings. If these readings are not achieved, replace thermocouple. Oven control If the thermocouple checks good, but there is no voltage output to the mercury contactor, replace the oven control. If there is voltage output to the mercury contactor, proceed. Mercury contactor Check for supply voltage to the contactor coil. If voltage is present and the contactor will not activate, replace the mercury contactor. Also check each contactor for high voltage input and output. Heating element(s) Check the Amp draw on each power leg for proper load. Check the specification plate for rating information. If the amp draw is high or low, check the individual elements for opens, shorts and proper resistance. WITH POWER OFF: To check resistance of the elements, remove all leads from the elements and use a digital multimeter. The element resistance is should be as follows: 208V – 27 ohms approx. 240V – 36 ohms approx. Replace heating elements as needed. Oven heats with switch off Mercury contactor The mercury contactor has probably failed in the closed position. If there is no voltage to the operating coil, but there is high voltage at the contactor output, replace the mercury contactor. Intermittent heating Thermal/overload of motor The main fan motor is equipped with internal Impinger II – Advantage Digital Express Service Manual - Domestic thermal protection and will cease to operate if overheating occurs. As the motor overheats and then cools, this will cause the oven to cycle on and off intermittently. Improper ventilation or lack of preventive maintenance may cause this. Also, most of the problems listed under “Oven will not heat” can cause intermittent failure. Conveyor will not run Power supply Check circuit breakers, reset if required. Check power plug to be sure it is firmly in receptacle. Measure incoming power, call power co. if needed. Fuse, 10 Amp Check, replace if necessary. Fuse holder Check, replace if necessary. Hi-limit thermostat, oven cavity Terminals are normally closed. If open, reset thermostat and retest. If thermostat will not hold for maximum oven temperature, and oven is not exceeding temperature setting, check for proper location of capillary bulb in its spring holder. If the capillary checks okay, replace the hi-limit thermostat. Power switch Check continuity between switch terminals. Replace switch as needed. Control transformer Check for supply voltage to the primary of the control transformer. If no voltage is present, trace wiring back to the oven power relay. If voltage is present, check for 24 VAC at the transformer secondary. If there is primary voltage but no secondary voltage, replace control transformer. Conveyor motor Check for supply voltage to the conveyor motor. If no voltage is present, trace wiring back to the primary of th...

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