Lincoln 1100 Series Mercury Contactor Heater Elements, Oven heats with switch off, of motor

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Mercury Contactor

Heater Elements

Oven heats with switch off

Mercury Contactor

Intermittent Heating	Thermal/Overload
	of motor

Conveyor will not run

S/N 2011383 and above

Conveyor speed varying or intermittent

S/N 2011383 and above

Time/Temp. Display inoperative

Impinger II - 1100 Series Service Manual - International

temperature control board and measure ohms from black to white leads. The reading should be from approximately 0 to 2.5k ohms as the dial of the potentiometer is turned throughout its full rotation. From black to red leads, the reading should be approximately 2.5k ohms (constant) throughout the full rotation of the dial. If these readings are not achieved, replace potentiometer. If the thermocouple probe and the control potentiometer check good, then the problem is usually with the temperature control board.

Check for 120 VAC to the contactor coil. If voltage is present and contactor will not activate, replace the contactor.

Also, check each contactor for proper high voltage input and output.

Check the Amp. draw on each hot leg for proper load.

Check the specifications plate for rating information.

If the Amp. draw is low or high, 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 an accurate digital VOM. The element resistance should be as follows:

200V - 24.5 ohms approximately The mercury contactor has probably malfunctioned 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.

The main fan motor is equipped with internal thermal protection and will cease to operate if overheating occurs. If the motor overheats and then cools, this will cause the oven to cycle on and off intermittently. This may be caused by improper ventilation or preventative maintenance. Also, most of the problems listed under “Oven will not heat” can cause intermittent failure.

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Contents INTERNATIONAL SERVICE MANUALIMPINGER CONVEYOR OVENS MODEL 1100 SERIESTABLE OF CONTENTS SEQUENCE OF OPERATIONS 1104 thru the display into a temperature reading SEQUENCE OF OPERATION 1134 - 1135 - 1136 - S/N 2011383 and above SEQUENCE OF OPERATIONS 2011383 and above SEQUENCE OF OPERATIONS 1152 thru intervals to maintain desired temperature by the display into a temperature reading temperature readingSCHEMATIC SCHEMATIC SCHEMATIC 1134, 1135, 1150, S/N 2011383 AND BELOW SCHEMATIC 1134, 1135 S/N 2011383 AND ABOVE SCHEMATIC 1150 S/N 2011383 AND ABOVE SCHEMATIC 1136, S/N 2011383 AND BELOW SCHEMATIC 1136, S/N 2011383 AND ABOVE SCHEMATIC 1151 S/N 2011383 AND BELOW SCHEMATIC 1151 S/N 2011383 AND ABOVE SCHEMATIC1152 THRU 1158 S/N 2011383 AND BELOW SCHEMATIC1152 THRU 1158 S/N 2011383 AND ABOVE SCHEMATIC1152 AND 1153 S/N 2011821 AND ABOVE SCHEMATIC 1154 THRU 1158 S/N 2011821 AND ABOVE MODELS 1152 - 1153 - 1154 - 1155 - 1156 TROUBLE SHOOTING GUIDE GAS OVENSNo main fan cool down Gas Pressure Switch Burner Switchswitch. If switch is closed and voltage present on one side only, replace switchCheck for proper line voltage to Pilot lamp is on, but Power Supply Ignition ControlFlame will not stay on Flame Sensorthen the problem is usually with thetemperature Check power supply at the DC improper adjustment. Also check for wornbearings. TheInstallation and Operations Manual Power SupplyDC Gearmotor required. This should eliminate the problem. If surge in the incoming power lines. To eliminatethis condition remove power from the time/temp switch for 15 seconds, or if display stays onTROUBLE SHOOTING GUIDE ELECTRIC OVENS adjustment knob to maximum temperature position Switch, HeatAir Pressure Switch This normally open switch should close when theas follows MODEL Main fan runs after are not achieved, replace thermocouple WITH POWER OFF: To check resistance of themaintenance. Also, most of the problems for proper readings. If these readingsConveyor will not run MODEL 1151 200 VAC THREE PHASE 60 HZ TROUBLESHOOTING GUIDE ELECTRIC OVENRelay, Main Fan REFER TO PAGE REFER TO PAGE 43 Mercury Contactor Heater ElementsConveyor will not run S/N 2011383 and above REFER TO PAGE REFER TO PAGE REFER TO PAGESTEPPER MOTOR DRIVE Conveyor will not run Thermocouple Probe Power Supply 12 VAC Power Supplyyellow wires, thermo red wire and 1 white wireexperienced, such as a rolling of IMPINGER II CONVEYOR OVEN REMOVAL, INSTALLATION, AND ADJUSTMENTRELAY, DPST 1.Shut off power at main breaker TO REMOVE BLOWER MOTOR This is part of the burner blower motor assemblyTO REMOVE THE BLOWER WHEEL FOR PERIODIC CLEANING MOTOR, BURNER BLOWERAIR PRESSURE SWITCH Page Page HEATING ELEMENTS 1.Shut off power at main breaker 1.Shut off power at the main breakerSOLENOID VALVE 1.Shut off power at main breaker 5.Loosen pipe union in piping assemblyIGNITION CONTROL 1.Shut off power at main breaker 5.Loosen 4 nuts holding manifold to burner cap ORIFICE, MAIN BURNER2.Shut off gas at main line to the oven 4.Remove control compartment coversLAMP, PILOT BURNER LENS, PILOT LAMP TACH. GENERATOR 1.Turn off power at main breaker OPTICAL ENCODER ASSEMBLY1.Remove gearmotor assembly see “GEARMOTOR” Above 7.To adjust optical encoderD C MOTOR CONTROL BOARD 1.Turn off power 2.Remove conveyor 1.Turn off power and remove conveyor4.Reverse wires fastened to terminals A+ and A 5.Reverse wires fastened to terminals T1 and T2TRANSFORMER, TIME/TEMP. DISPLAY MODEL 1100 SERIES OVENS OVEN TEMPERATURE SWITCH, DISPLAY, SETOHMS SWITCH, ON/OFF TRANSFORMER, STEP DOWN/120 VAC DIP SWITCHES FOR 50 SEC. TO 30 MIN. TIMES maximum speed potrefer HALL EFFECT SENSOR - REPLACEMENT AIR PRESSURE SWITCH, BURNER OR OVEN CAVITY 10.Assemble in reverse order BURNER ALARM - REPLACEMENT4.Remove conveyor gear motor 8.Remove top control compartment braceLETTER GENERAL –1100SERIESDESCRIPTION GENERAL 1100 SERIES BLOW UP 1136,1150,1151,1160 Thru1163 Page DESCRIPTION CONTROL COMPARTMENT - FRONTMODELS 1152 THRU LETTERCONTROL COMPARTMENT – FRONT 1152-1158BLOW UP LETTER CONTROL COMPARTMENT – REARDESCRIPTION CONTROL COMPARTMENT - REAR BLOW UP MODELS AND ABOVE MODELS 1130-1136,1150,1151S/N 2011383 AND ABOVE CONTROL COMPARTMENT – REAR BLOW UPMODELS 1160-1163S/N 2011978 AND ABOVE LETTER CONTROL COMPARTMENT – REARDESCRIPTION Page DESCRIPTION CONTROL COMPARTMENT – REARMODELS 1152 THRU 1158 S/N 2011821 AND ABOVE LETTERPage OVEN BACK ASSEMBLY – 1100 SERIES OVEN BACK ASSEMBLY – 1100 SERIES BLOW UP GEARMOTOR ASSEMBLY – 1100 SERIES GEARMOTOR ASSEMBLY – 1100 SERIES BLOW UP CONVEYOR/DOOR – 1100 SERIES CONVEYOR/DOOR – 1100 SERIES BLOW UP This page intentionally left blank This page intentionally left blank