Lincoln Comprehensive Guide to Impinger Convection Oven Operations

SEQUENCE OF OPERATIONS

IMPINGER II ADVANTAGE

MODEL 1116-000-A / NATURAL GAS / 120 VAC / 60 HZ / 1 PHASE

MODEL 1117-000-A / L.P. GAS / 120 VAC / 60 HZ / 1 PHASE

POWER SUPPLY	Electrical power is supplied to the oven by a three conductor cordset. Voltage
	from the black conductor to the white conductor is 120 VAC. The white
	conductor is neutral. The green conductor is ground.
CONTROL BOX AUTO	When the temperature in the control box reaches 120°F ± 3° (48.9°C ± 1.7°C),
	the
COOL DOWN	interrupt power to the fans when the control box temperature falls to 100°F ± 3°
	(37.8°C ± 1.7°C).
MAIN FAN CIRCUIT	Power is permanently supplied, through a 10A fuse, and through a normally
	closed control box hi-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 120 VAC to the main fan motor, the cooling fan motor,
	the primary of the temperature display transformer, the heat and conveyor
	circuits.
BURNER CIRCUIT	Closing the main fan switch supplies 120 VAC to the burner blower motor. 120
	VAC is also supplied, through the normally closed oven cavity hi-limit thermostat,
	the main fan centrifugal switch (this switch closes when main fan reaches
	approximately 1600 RPM) to the electronic temperature control and to the
	primary of the burner transformer.
IGNITION CONTROL	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 the hot surface ignitor warm
	up. The ignitor glows red, 24 VAC is switched to the gas valve which opens and
	ignition should now occur.
TEMPERATURE CONTROL	When the centrifugal switch of the main fan motor closes, power is applied to the
	temperature control. The 1K 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. The heat lamp is
	energized with the solenoid valve.
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.

Impinger II –Advantage Service Manual - Domestic 3