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Impinger II – Advantage Digital Service Manual - International
2
SEQUENCE OF OPERATIONS
IMPINGER II ADVANTAGE
SERIAL NUMBER 2038616 AND ABOVE
(OVENS WITH PUSH BUTTON CONTROLS)
MODEL 1154-000-EA NAT. GAS 230VAC 50 HZ. 1 PHASE
MODEL 1155-000-EA LP GAS 230VAC 50 HZ. 1 PHASE
POWER SUPPLY Electrical power to be supplied to the oven by a three conductor service.
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 (37.8°C ± 1.7°C).
MAIN FAN CIRCUIT Power is permanently supplied, through a 10 amp oven fuse, through a normally
closed control box hi-limit thermostat (opens at 140°F, 60°C), to the normally open
double pole oven fan switch and to the cooling fan. Closing the oven fan switch
supplies line voltage to the main fan motor. Closing the main fan switch also
supplies voltage to the cooling fan, the primary of the control transformer, the
conveyor motor, and the burner system.
BURNER CIRCUIT Closing the oven fan switch supplies line voltage through the normally open gas
pressure switch (located in the gas valve and closed when gas pressure is
present), through the normally open air pressure switch (closed by the air pressure
from the main fan), through the normally closed oven cavity hi-limit thermostat
(opens at 662°F, 350°C), and to the ignition control.
IGNITION CONTROL The ignition control switches line voltage to the combustion blower motor. The
combustion air pressure switch switches from normally closed to normally open
upon sensing air pressure in the burner housing. After a pre-purge period of
between 30 and 60 seconds, the spark generator is energized, the main gas valve
and the burner pilot light are energized, and ignition should now occur.
TEMPERATURE CONTROL Closing the oven fan switch supplies line voltage to the primary of the control
transformer. 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 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 fan 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 conveyor motor is not running, “BELT JAM”
is indicated on the display.