Sigma 1457, 1433-000-E, 1456, 1434-000-E service manual Sequence Of Operation Impinger Advantage

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	When the temperature in the control box reaches 120°F ± 3°F (48.9°C
COOL DOWN	±	°
	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.

2 Impinger I – Adv Digital – Gas Service Manual – International