Lincoln II - Advantage Series service manual Control BOX Auto Cool Down, Heater Circuit

SEQUENCE OF OPERATIONS

	1130-000-A / 208V / SINGLE PHASE
	1131-000-A / 240V / SINGLE PHASE
	1132-000-A / 208V / THREE PHASE
	1133-000-A / 240V / THREE PHASE
POWER SUPPLY	Electrical power to be supplied to the oven by a three-conductor service on single
	phase and a four-conductor service on three phase.
	Black conductor is Hot
	Red conductor is Hot
	Orange conductor is Hot (Used on 3 phase only)
	Green conductor is ground.
CONTROL BOX AUTO COOL DOWN	When the temperature in the control box reaches 120°F ± 3°F (48.9°F ± 1.7°C),
	the cooling fan thermostat will switch power to the cooling fans. The thermostat
	will interrupt power to the fans when the temperature falls to 100°F ± 3°F (37°C ±
	1.7°C).
MAIN FAN CIRCUIT	Power is permanently supplied through the 10A fuses, through the normally
	closed control box high limit thermostat, to the normally open main fan switch.
	Power is also supplied to the normally open cooling fan thermostat. Closing the
	main fan switch supplies 208/240 VAC to the main fan motor, the cooling fan
	motor, to the primary of the temperature display transformer and to the heat and
	conveyor circuits.
HEATER CIRCUIT	Closing the fan switch supplies 208/240 VAC, through the normally open air
	pressure switch (closed by air pressure from the main fan) through the normally
	closed oven cavity hi-limit thermostat, to the electronic temperature control. The
	1K ohm temperature pot is adjusted to desired temperature. The thermocouple
	will provide varying millivolts to the temperature controller. The temperature
	control then supplies 208/240 VAC to the coil of the contactor at intermittent
	intervals to maintain the desired temperature. The heat lamp is energized with
	the contactor.
CONVEYOR DRIVE	Closing the on/off switch supplies 120 VAC to the motor control board. AC volts
	are converted to DC volts and are supplied to the conveyor motor at terminals A+
	and A-.
	Adjustment of the speed control potentiometer will change resistance at terminals
	P1 and P2 varying the DC voltage to the motor. The speed of the conveyor
	motor will increase or decrease as the DC voltage from the board increases or
	decreases respectively.
NOTE:	The conveyor control uses a sensor and magnet, mounted on the conveyor
	motor that senses the motor speed. Any change in motor load (±RPM) is
	detected by the sensor and the voltage to the motor is adjusted accordingly.
Temperature Display	Closing the switch supplies 120 VAC to the primary of the temperature display
	transformer. The secondary of this transformer supplies 12 VAC to the
	temperature display. The thermocouple supplies D.C. millivolts to the
	temperature display. The display converts this millivolt reading to a temperature
	reading.

4 Impinger II – Advantage Service Manual - Domestic