Lincoln 1922, 1921 THERMOSTAT, HI-LIMIT Replacement, Heating ELEMENT, Main Replacement

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THERMOCOUPLE MEASUREMENT

TEMPERATURE (°F)

D.C. MILLIVOLTS

200°

2.8

250°

4.0

300°

5.1

350°

6.0

400°

7.1

450°

8.2

500°

9.3

550°

10.4

600°

11.5

THERMOSTAT, HI-LIMIT – REPLACEMENT

1.Shut off power at main breaker.

2.Remove rear cover, remove right side heating element cover.

3.Remove hi-limit thermostat from the mounting bracket. Remove mounting nut from hi- limit thermostat. Remove hi-limit thermostat.

4.Form 90° bend in hi-limit thermostat.

5.Reassemble in reverse order and check system operation. Be sure to reset thermostat before testing.

HEATING ELEMENT, MAIN – REPLACEMENT

1.Shut off power at main breaker.

2.Remove conveyor, finger assemblies and plenum front. Remove rear cover and appropriate heating element cover.

3.Remove wires from heating element and mark wiring for reassembly.

4.Remove mounting screws and remove heating element.

5.Reassemble in reverse order and check system operation.

HEATING ELEMENT, INFRARED – REPLACEMENT

1.Shut off power at main breaker.

2.Remove conveyor and lower finger assemblies. Remove front conveyor support from oven cavity.

3.Remove front cover and heating element cover. Disconnect wiring from heating element and mark wires for reassembly.

4.Reassemble in reverse order and check system operation.

MAIN CONTROL – REPLACEMENT

1.Shut off power at main breaker.

2.Remove control box top, front panel and rear control box cover.

3.Remove display board from front panel by pulling board off of it’s mounting pins.

4.Remove three screws from main control mounting bracket and remove main control board and its mounting bracket. Remove main control from it’s mounting bracket by pulling the control from the mounting bracket.

5.When installing new control, be sure to use ground strap so that there is no static electricity. When installing new control, be sure to set the jumpers on the control for proper

DTF – 1920 Series Service Manual

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Contents Dual Technology Finisher Dual Technology Finisher Schematic Diagram Model 1922 S/N 8001207 and Below Model 1921 / 1922 S/N 8001208 and Above Troubleshooting Guide With Power on and Thermocouple Digital multimeter Page Main FAN Replacement MOTOR, Main FAN ReplacementSWITCH, ON/OFF SWITCH, Standby Replacement RELAY, Time Delay ReplacementFuse Holder Replacement Circuit BREAKER, Main Motor ReplacementRELAY, Main Heater RELAY, Infrared Heater Replacement Reversing SWITCH, Conveyor ReplacementConveyor Motor Replacement CAPACITOR, Conveyor Motor ReplacementAIR Pressure Switch Replacement AIR Pressure Switch AdjustmentHeating ELEMENT, Main Replacement THERMOSTAT, HI-LIMIT ReplacementHeating ELEMENT, Infrared Replacement Main Control ReplacementPage This page intentionally left blank General View Page Control BOX View Page Rear View Page Conveyor Model 1921 8001200 and Above