Sequence Of Operations 1116 - 1117 - Lincoln 1100 Series Service Manual

POWER SUPPLY
CONTROL BOX AUTO
MAIN FAN CIRCUIT
BURNER CIRCUIT
IGNITION CONTROL
TEMPERATURE CONTROL
CONVEYOR DRIVE
TIME/TEMP DISPLAY
4

SEQUENCE OF OPERATIONS 1116 - 1117

MODEL 1116 / NATURAL GAS / 120 VAC / 60 HZ / 1 PHASE
MODEL 1117 / L.P GAS / 120 VAC / 60 HZ / 1 PHASE
Electrical power is supplied to the oven by a three conductor cord set. Voltage from
the black conductor to the white conductor is 120 VAC. The white conductor is
neutral. The green conductor is ground.
When the temperature in the control box reaches 120°F
1.7°C), the Cooling Fan Thermostat will switch power to the Control Box Cooling
Fans. The thermostat will interrupt power to the fans when the control box
temperature falls to100° F
Power is permanently supplied to the normally open contacts of the oven fan relay,
the normally open cooling fan thermostat, terminal #1 of the time delay relay and
the normally open main fan switch. Closing the main fan switch enables the 20
minutes time delay relay. The time delay relay supplies 120 VAC to the coil of the
main fan relay. These normally open contacts now close energizing the main fan
motor and the cooling fans. Closing the fan switch also energizes the time/temp
display, the heat and conveyor switches.
Closing the Burner Switch supplies 120 VAC through the 10 Amp Fuse, through
the Main Fan Motor Centrifugal Switch, and oven cavity High Limit Thermostat to
terminal L1 of the Ignition Control. The Centrifugal Switch of the Main Fan Motor
closes when the fan motor reaches 1600 RPM. The High Limit Thermostat opens
at 662° F(350°C) and may be manually reset after the sensing bulb temperature
drops 18° F(10°C).Power (120 VAC) is also supplied to the Burner Blower Motor.
As this motor reaches approximately 1600 RPM, its Internal Centrifugal Switch
closes, supplying 120 VAC through the normally closed Control Box High Limit
Thermostat, to the primary of the 24 VAC Transformer and the Temperature
Control. The Control Box High Limit Thermostat is manually re-settable and opens
when the control box reaches 170° F
2011383)
The Ignition Control operates on both 24 VAC and 120 VAC. When the control is
energized by 24 VAC from the Transformer, 120 VAC is switched by the Ignition
Control to the Hot Surface Ignitor for 45 seconds for Hot Surface Ignitor warm up.
The Ignitor glows red, 24 VAC is switched to the gas valve which opens, and
ignition should now occur. If ignition does not occur in 6 seconds, the control will
lock out. To recycle after lockout, turn off the burner switch for 45 seconds and
then turn the switch back on.
When the Centrifigual Switch of the Burner Blower Motor closes, power is applied
to the Temperature Control. The 2.5K ohm Temperature Pot is adjusted to desired
temperature. The Thermocouple will provide varying millivolts to the Temperature
Controller. The Temperature Controller supplies 120 VAC to the Solenoid Valve at
intermittent intervals to maintain desired temperature.
Closing the Fan Switch and the Conveyor Switch, supplies 120 VAC through 3
Amp Fuse to L1and L2 of the Motor Control Board. AC volts are converted to DC
by the Control Board and are supplied to the Motor from Board terminals A+ and A-
. Adjustment of the Speed Control Pot (5,000 ohm 10 turn pot) will change
resistance at terminals P1, P2, and P3 varying S/N 2011383 and above the DC
voltage to the motor. The speed of the Conveyor Motor Refer to page 26 will
increase or decrease as the DC voltage from the board increases or decreases
respectively. As the motor turns, it drives both the Reducer Gear Box and the
Tach. Generator. The Tach. Generator is a DC voltage Generator that supplies a
voltage to the DC Motor Control Board and is used as a reference for maintaining a
constant conveyor speed.
The secondary output of the Transformer, is supplied to terminals 1, 2, and 3 of the
Time/Temp. Display. The secondary output of Transformer is nominally 12.5 to 15
VAC with a center tap. The voltage from center tap to each leg is 1/2 the
secondary voltage.
3° (37.8° C 1.7° C).
5° (76° C
Impinger II –1100 Series Service Manual - Domestic
COOL DOWN 3° (48.9°C
3° C). (Discontinued at S/N