Lincoln 1450 - Manual (Page 2)

Impinger I – 1450 Series Service Manual - Domestic 2
SEQUENCE OF OPERATION
IMPINGER ADVANTAGE
SERIAL NUMBER N28654 AND ABOVE
(OVENS WITH PUSH BUTTON CONTROLS)
MODEL 1450 120VAC 60 HZ. NAT. GAS
MODEL 1451 120VAC 60 HZ. LP GAS
POWER SUPPLY Electrical power is supplied to the oven by a three conductor cordset. Voltage
from the black conductor to the white conductor is 120VAC. The white
conductor is neutral. The green conductor is ground.
CONTROL BOX AUTO
COOL DOWN
When the temperature in the control box reaches 120 °F ± 3° (48.9°C ± 1.7°C),
the cooling fan thermostat will switch power to the control box cooling fan. The
thermostat will interrupt power to the cooling fan when the control box
temperature falls to 100
°F ± 3° (37.0°C ± 1.7°C).
MAIN FAN CIRCUIT Electrical power is permanently supplied, through a 10 Amp fuse, to the
normally open contacts of the oven power switch. Power is also supplied to the
normally open control box cooling fan thermostat. Closing the oven power
switch supplies 120VAC to the main fan motor and to the control box cooling
fan. Closing the oven power switch also supplies 120VAC to the burner blower
motor, the primary of the oven control transformer and to the centrifugal switch
of the main fan motor.
BURNER CIRCUIT Closing the oven power switch supplies 120VAC to the burner blower motor and
to the normally open centrifugal switch of the main fan motor. As the main fan
motor reaches approx.900 RPM, the centrifugal switch closes supplying
120VAC to the oven control and to the primary of the burner transformer. The
transformer secondary supplies 24VAC, through the centrifugal switch of the
burner blower motor, to the ignition control.
IGNITION CONTROL When the ignition control is supplied with 24VAC, the pilot valve and spark
igniter are energized. Ignition should now occur. After the pilot flame is proven,
the main valve is energized.
TEMPERATURE CONTROL Closing the oven fan switch supplies 120VAC to the primary of the control
transformer and, through the centrifugal switch of the main fan motor, to the
oven control. Secondary voltage, 24VAC, is supplied to the oven control. The
oven control is set to desired temperature. The thermocouple will provide
varying millivolts to the oven control. The oven control supplies 120VAC to the
temperature regulation valve at intermittent intervals to maintain the desired
temperature. The display on the oven control will indicate when the temperature
regulation valve is energized.
NOTE: The display also indicates oven temperature.
CONVEYOR DRIVE Closing the oven power switch supplies 120VAC to the conveyor motor and to
the primary of the control transformer. Secondary voltage, 24VAC, is supplied to
the oven control. Setting the oven control to the desired time outputs voltage,
through a reversing switch, to the conveyor motor.
NOTE: The conveyor system uses a hall effect sensor and magnet to prove
operation of the conveyor motor. If the conveyor motor is not running, “BELT
JAM” is indicated on the display.