Lincoln Foodservice 1600-000-A, Service Manual

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Low Profile – 1600 Series Advantage Digital Service Manual – Domestic 2
SEQUENCE OF OPERATIONS / 1600-000-A, 1601-000-A
SERIAL NUMBERS L28563 and ABOVE
(with push button control)
MODEL 1600-000-A / 120 VAC / 60 HZ / NATURAL GAS
MODEL 1601-000-A / 120 VAC / 60 HZ / L.P. 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 to be 120 VAC.
White conductor is Neutral.
Green conductor is Ground.
CONTROL BOX AUTO
COOL DOWN
When the temperature in either one of the Control Boxes reaches 120
°
F
±
3
°
F (49
°
C
±
1.7
°
C), the Cooling Fan Thermostats will switch power to the Cooling Fans. The
thermostats will interrupt the power to the Cooling Fans when temperature falls to
100
° F ± 3 ° F (37 ° C ± 1.7 ° C).
MAIN FAN CIRCUIT 120 VAC is permanently supplied to the normally open Power Switch, both normally
open Cooling Fan Thermostats, and one of the normally open contacts of the Power
Relay. Closing the normally open Power Switch supplies 120 VAC through the Cooling
Fan Motor Fuse, and through both normally closed control box Hi-limit Thermostats
energizing the coil of the Oven Power Relay. These normally open contacts now close
supplying 120 VAC through the 10 Amp Main Fan Motor Fuse to the two Main Fan
Motors and the two Burner Motors. Power is also supplied to the four cooling fan
motors, the Control Transformer, heat, and conveyor control systems.
BURNER CIRCUIT Closing the Oven Power Relay supplies 120 VAC to the two burner systems.
NOTE: This oven utilizes two complete burner 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 oven Temperature
Control, and the Burner Transformer. As the Burner Blower reaches approximately
1600 R.P.M., its internal Centrifugal Switch will close, supplying 24 VAC to the Ignition
Control. The Ignition Control operates on both 24 VAC and 120 VAC. When the Ignition
Control is energized by 24 VAC, 120 VAC is switched to the Hot Surface Igniter for 45
seconds for Hot Surface Igniter warm up. The igniter glows red, 24 VAC is switched to
the Gas Valve which opens, and ignition should occur. If ignition does not occur in 6
seconds, the control will lock out. To recycle after lockout, turn the Power Switch off for
45 seconds and then turn back on.
TEMPERATURE
CONTROL
When the Centrifugal Switch of the Main Motor Fan closes, power is applied to the
oven Control. The Oven Control is set to the desired temperature. The thermocouple
will provide varying millivolts to the Oven Control. The Oven Control supplies 120 VAC
to the Temperature Regulation Valve at intermittent intervals to maintain the desired
temperature. The display on the Oven Control will indicate when the Temperature
Control Valve is energized.
NOTE: The display also indicates oven temperature.
CONVEYOR DRIVE Closing the main Power Switch supplies 120 VAC through the Oven Power Relay to
the Conveyor Motor and to the primary of the Control Transformer. Secondary voltage,
24 VAC, is supplied to the Oven Control. Setting the Control to the desired time outputs
voltage through a Reversing Switch to the Conveyor Motor.
NOTE: The conveyor system uses a Magnet and a Hall Effect Sensor to prove
operation of the Conveyor Motor. If the Conveyor Motor is not running, “BELT JAM” is
indicated on the display.