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Impinger I – Adv Digital – Gas Service Manual – International
2
SEQUENCE OF OPERATION
IMPINGER ADVANTAGE
SERIAL NUMBER N28654 AND ABOVE
(OVENS WITH PUSH BUTTON CONTROLS)
MODEL 1433-000-E 230VAC 50 HZ. NAT. GAS
MODEL 1434-000-E 230VAC 50 HZ. LP GAS
MODEL 1456 220/240VAC 50 HZ. NAT. GAS
MODEL 1457 220/240VAC 50 HZ. LP GAS
POWER SUPPLY Electrical power is to be supplied to the oven by a three conductor
service.
Brown conductor is hot.
Blue conductor is neutral.
Green conductor is ground.
CONTROL BOX AUTO
COOL DOWN
When the temperature in the control box reaches 120°F ± 3°F (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°F (37°C ± 1.7°C).
MAIN FAN CIRCUIT Electrical power is permanently supplied, through the 10 Amp oven
fuse, to a normally open contact of the oven power switch. Power is
also supplied to the control box cooling fan. Closing the oven power
switch supplies line voltage to the main fan motor. Closing the oven
power switch also supplies line voltage to the heat circuit and to the
primary of the oven control transformer.
BURNER CIRCUIT Closing the oven power switch supplies line voltage through the main
fan air pressure switch, through the normally closed oven cavity hi-limit
thermostat. Through the gas pressure proving switch (gas pressure
switch removed at S/N N31348) to the ignition control. The combustion
motor is now energized, the normally open combustion air switch
closes upon sensing air. After a pre-purge period between 30 and 60
seconds, the spark generator and the main gas valve are energized.
Ignition should now occur
TEMPERATURE CONTROL Closing the oven fan switch supplies line voltage to the primary of the
control transformer and through the ignition control, 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
line voltage to the temperature regulation valve at intermittent intervals
to maintain 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 line voltage 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 motor is not running,
“BELT JAM” is indicated on the display.