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Service Manual (Domestic & International)

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Service Manual (Domestic & International) SERVICE MANUAL (DOMESTIC & INTERNATIONAL) IMPINGER CONVEYOR OVENS LOW PROFILE - 1600 SERIES Lincoln Foodservice Products, Inc. 1111 North Hadley Road P.O. Box 1229 Fort Wayne, Indiana 46801-1229 Phone: (800) 374-3004 • Fax: (260) 436-0735 Technical Service Hot Line (800) 678-9511 www.lincolnfp.com 1600SvcMan REV: 12/13/05 TABLE OF CONTENTS TABLE OF CONTENTS..............................................................................................................................................2 SEQUENCE OF OPERATIONS 1600 / 1601 / 1652..................................................................................................3 SEQUENCE OF OPERATIONS 1622 / 1623.............................................................................................................4 SEQUENCE OF OPERATIONS / 1628 / 1629...........................................................................................................5 SEQUENCE OF OPERATIONS / 1646, 1647, 1650, 1651........................................................................................7 SCHEMATIC / 1600, 1601, 1652 ...............................................................................................................................9 SCHEMATIC / 1622, 1623........................................................................................................................................10 SCHEMATIC / 1628, 1629........................................................................................................................................11 SCHEMATIC / 1646, 1647, 1650, 1651 ...................................................................................................................12 TROUBLESHOOTING GAS OVENS ......................................................................................................................13 TROUBLESHOOTING / 1622, 1623, 1628, 1629 ...................................................................................................20 TROUBLESHOOTING / 1646, 1647, 1650, 1651 ....................................................................................................26 REMOVAL, INSTALLATION & ADJUSTMENTS .....................................................................................................32 PARTS / GENERAL - 1600 SERIES ........................................................................................................................48 BLOW UP / GENERAL – 1600 SERIES...................................................................................................................49 PARTS / CONTROL BOX, RIGHT- 1600 - 1601 - 1652 ..........................................................................................50 BLOW UP / CONTROL BOX RIGHT – 1600, 1601, 1652 .......................................................................................51 PARTS / CONTROL BOX, LEFT - 1600 - 1601 - 1652............................................................................................52 BLOW UP / CONTROL BOX LEFT – 1600, 1601, 1652..........................................................................................53 PARTS / CONTROL BOX, RIGHT –1622,1623,1628,1629.....................................................................................54 BLOW UP / CONTROL BOX RIGHT – 1622,1623,1628,1629 ................................................................................55 PARTS / CONTROL BOX, LEFT 1622,1623,1628,1629 .........................................................................................56 BLOW UP / CONTROL BOX LEFT – 1622, 1623, 1628, 1629................................................................................57 PARTS / CONTROL BOX RIGHT – 1646, 1647, 1650, 1651..................................................................................58 BLOW UP / CONTROL BOX RIGHT – 1646,1647,1650,1651 ................................................................................59 PARTS / CONTROL BOX LEFT – 1646, 1647, 1650, 1651 ....................................................................................60 BLOW UP / CONTROL BOX LEFT – 1646,1647,1650,1651...................................................................................61 PARTS / BACK - 1600 SERIES ...............................................................................................................................62 BLOW UP / BACK – 1600 SERIES ..........................................................................................................................63 PARTS / CONVEYOR - 1600 SERIES.....................................................................................................................64 BLOW UP / CONVEYOR – 1600 SERIES ...............................................................................................................65 2 Low Profile -–1600 Series Service Manual – Dom & Int’l SEQUENCE OF OPERATIONS 1600 / 1601 / 1652 MODEL 1600 / 120 VAC / 60 HZ / NATURAL GAS MODEL 1601 / 120 VAC / 60 HZ /L.P. GAS MODEL 1652 / 120 VAC / 60 HZ / TOWN GAS POWER SUPPLY Electrical power to be supplied to the oven by a three conductor cordset. Voltage from the black conductor to the white conductor is 120 VAC. White conductor is Neutral. Green conductor is Ground. CONTROL BOX When the temperature in either one of the Control Boxes reaches 120°F ± 3°F (49°C AUTO COOL DOWN ± 1.7°C), the Cooling Fan Thermostats will switch power to the Cooling Fans. The thermostats will interrupt power to the Cooling Fans when the temperature falls to 100°F ± 3°F (37°C ± 1.7°C). MAIN FAN CIRCUIT 120 VAC is permanently supplied to the normally open contacts of the Oven Power Relay, to terminal #1 of the 20-Minute Time Delay Module, the normally open contacts of the Fan Relay and to the (2) normally open Cooling Fan Thermostats. Closing the normally open Power Switch supplies 120 VAC to the coil of the Oven Power Relay. These normally open contacts now close, enabling the 20-Minute Time Delay Module. The 20 Minute Time Delay Module supplies 120 VAC to the Oven Fan Relay, these normally open contacts now close, supplying 120 VAC, through a 10 Amp fuse, to the (2) Main Fan Motors and, through a 3 Amp fuse, to the (2) Control Box Cooling Fans. BURNER CIRCUIT Closing the Oven Power Relay energizes the coil of the Burner Relay. The (2) normally open contacts now close supplying120 VAC to the (2) burner systems. NOTE: This oven utilizes (2) complete Burner/Temp. Control Systems. The sequence of operations is the same for each system.120 VAC is supplied, through the Centrifugal Switch of the Main Fan Motor (this switch closes when the Main Fan reaches approximately 1600 R.P.M.) through the 10 Amp Fuse, to the Ignition Control, the Electronic Temperature Control, and to the Burner Blower Motor. As this Blower reaches approximately 1600 R.P.M., its internal centrifugal switch will close, supplying 120 VAC through the cooling fan sail switch to the Burner Transformer. NOTE: The Cooling Fan Sail Switch is mounted in front of the cooling fan and is activated by the air flow of the Cooling Fan. The secondary of the Transformer supplies 24 VAC to the Ignition Control. The Ignition Control operates on both 24 VAC and 120 VAC. When the control is energized by 24 VAC, 120 VAC is switched to the Hot Surface Ignitor for 45 seconds for Hot Surface Igniter warm up 24 VAC is now switched to the Gas Valves which open. Ignitor glows red, and ignition should now occur. The red Indicator Light is also now energized. If ignition does not occur within 6 seconds, the control will lock out. To retry after lockout, turn off the burner switch, wait 45 seconds, and then turn the switch back on. TEMPERATURE When the Centrifugal Switch of the Burner Blower Motor closes, power is applied to CONTROL the Temperature Control. The2.5 K ohm Temperature Pot is adjusted to desired temperature. The thermocouple will provide varying millivolts to theTemperature Controller. The Temperature Controller supplies 120 VAC to Temperature Regulation Valve at intermittent intervals to maintain desired temperature. CONVEYOR DRIVE Closing the Power Switch supplies 120 VAC, through the contact of the Oven Power Relay, to the primary of the (2) Time/Temp. Transformers. The secondary output of the Transformers, 12.5 to 15 VAC with a center tap, is supplied to terminals 1, 2, and 3 of the Time/Temp. Display. The Display works on a balanced input, and center tap voltage to each leg must be 1/2 the total reading. TIME/TEMP DISPLAY The speed side of the Time/Temp. Display is supplied, by the Conveyor Control, with the frequency of the pulses to the Conveyor Motor. This frequency is converted by the Time/ Temp. Display into a read out of minutes and seconds. The Conveyor Control uses a sensor and magnet, mounted on the Conveyor Motor, NOTE that senses when the motor is turning. If the motor is not turning, the Time/Temp. Display will show "--:--" in the window. The temperature portion of the display uses a Thermistor Probe to sense oven temperature. The Thermistor outputs a resistance proportional to oven temperature. This resistance is then converted by the Display into a temperature reading. Low Profile -–1600 Series Service Manual – Dom & Int’l 3 OR: The temperature portion of the display uses a "J" type thermocouple to measure oven temperature. The thermocouple generates D.C. millivolts proportional to oven temperature. This millivolt reading is then converted by the display into a temperature reading. The oven utilizes (2) Temperature Display systems, one each for the left and right sides of the cooking chamber.
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