POWER SUPPLY
CONTROL BOX
AUTO COOL DOWN
MAIN FAN CIRCUIT
BURNER CIRCUIT
IGNITION CONTROL
TEMPERATURE CONTROL
CONVEYOR DRIVE
SEQUENCE OF OPERATION
MODEL 1450 / 120 VAC / 60 HZ / NATURAL GAS
MODEL 1451 / 120 VAC / 60 HZ / LP GAS
MODEL 1480 / 120 VAC / 60 HZ / TOWN GAS
Electrical power is supplied to the oven by a
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
Electrical power is permanently supplied to the normally open contacts of the double pole main fan relay, the cooling fan thermostat and the normally open switch. Closing the on/off switch energizes the coil of the relay through the 3A fuse. The normally open contacts now close, energizing the main fan motor through the 10A fuse, and the control
Closing the on/off switch supplies 120 VAC to the burner blower motor and the normally open centrifugal switch of the main fan motor. As the fan motor reaches approximately (900 RPM) the centrifugal switch closes supplying120 VAC to the electronic temperature control board and the primary of the burner control transformer. The transformer secondary supplies 24 VAC through the normally open centrifugal switch (inside the burner blower motor, this switch closes at approximately 1600 RPM) to the burner control. The igniter circuit is now energized.
When the burner control is supplied with 24 VAC, the pilot valve and spark igniter is energized. Ignition should now occur, after the pilot flame is proven, the main gas valve is energized.
When the centrifugal switch of 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 solenoid valve (and the yellow cycling lamp on the front panel) at intermittent intervals to maintain desired temperatures.
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 A- Adjustment of the speed control potentiometer will change resistance at terminals P1 & 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.
SEQUENCE OF OPERATIONS
POWER SUPPLY
CONTROL BOX AUTO COOL DOWN
MAIN FAN CIRCUIT
MODEL 1452 | 120/208 VAC | 3 PHASE | 60 HZ |
MODEL 1453 | 120/240 VAC | 3 PHASE | 60 HZ |
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 6, 50A fuses to the normally open contacts of the mercury contactors. 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, and through a 3A fuse to the normally open single pole main fan switch. Closing the main fan switch supplies 120 VAC to the coil of the main fan relay. The coil of the relay is
Impinger I – 1400 Series Advantage Service Manual – Dom & Int’l | 3 |
