HEAT CIRCUIT
TEMPERATURE CONTROL
CONVEYOR DRIVE
energized, the normally open contacts close, energizing the main fan motor and cooling fan. Closing the main fan switch also supplies power to the conveyor control and the centrifugal switch of the main fan motor.
Closing the on/off switch supplies 120 VAC to the normally open centrifugal switch (inside the main fan motor). As the motor reaches approximately (900 RPM) the centrifugal switch closes supplying 120 VAC through the normally closed oven cavity and control box
When the centrifugal switch (inside the main fan motor) closes, 120 VAC is applied to the temperature controller. The temperature dial is adjusted to the desired temperature. The thermocouple will provide varying millivolts to the temperature controller. The temperature controller supplies 120 VAC to the contactor coils at intermittent intervals (closing the contactors and supplying 208 or 240 VAC to the heating elements) to maintain desired temperature. The ready lamp is energized with the contactors.
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
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.
POWER SUPPLY
CONTROL BOX AUTO COOL DOWN
MAIN FAN CIRCUIT
HEAT CIRCUIT
TEMPERATURE
CONTROL
CONVEYOR DRIVE
4
SEQUENCE OF OPERATIONS
MODEL 1454 / 380/220 VAC / 50 HZ / 3 PHASE
MODEL 1455 / 415/240 VAC / 50 HZ / 3 PHASE
Electrical power is to be supplied to the oven by a
Red conductor is hot. Orange conductor is hot.
White conductor is dedicated neutral. Green conductor is ground
When the temperature in the control box reaches 120°F ± 3°, (49°C ± 1.7°C), the cooling fan thermostat will switch power to the cooling fan. The thermostat will interrupt power to the cooling fan when the temperature falls to 100°F ± 3° (37°C ± 1.7°C).
Electrical power is permanently supplied through three 50A fuses to the normally open contacts of the mercury contactor. Power is also supplied through 1, 10A fuse to the normally open contacts of the main fan relay, to the normally open cooling fan thermostat, through a 3A fuse to the normally open single pole main fan switch. Closing the main fan switch supplies 220/240 VAC to the primary of the control circuit step down transformer. (The transformer steps the voltage down to 120 VAC for the control circuit.) 120 VAC is supplied to the coil of the main fan relay. The coil of the relay is energized, the normally open contact close, energizing the main fan motor and cooling fan. Closing the main fan switch also supplies power to heat and conveyor control.
Upon closure of the on/off switch 120 VAC is supplied through the air pressure switch, through the normally closed oven cavity and control box
When 120 VAC is supplied to the temperature controller and the temperature dial is adjusted to the desired temperature, the thermocouple will provide varying millivolts to the temperature controller. The temperature controller supplies 120 VAC to the contactor coil at intermittent intervals, (closing the contactor and supplying 220 or 240 VAC to the heating elements) to maintain desired temperature.
Closing the on/off switch supplies 120 VAC to the conveyor control board. AC volts are converted to DC volts and are supplied to the conveyor motor at terminals A+ and
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.
Impinger I – 1400 Series Advantage Service Manual - Dom & Int’l
