Lincoln 1633-000-EA, 1634-000-EA service manual Sequence Of Operations

SEQUENCE OF OPERATIONS

MODEL 1633-000-EA 230 VAC 50HZ NATURAL GAS

MODEL 1634-000-EA 230 VAC 50HZ L.P. GAS

POWER SUPPLY

Electrical power 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 either one of the control boxes reaches 120°F ±3° (49°C ± 1.7° ) , the cooling fan thermostats will switch power to the cooling fans . The thermostats will interrupt power to the cooling fans when the temperature falls to 100°F ± 3° (37°C ± 1.7° )

MAIN FAN CIRCUIT

Line voltage is permanently supplied to a normally open contact of the oven power switch. Line voltage is permanently supplied to the two normally open cooling fan thermostats, a normally open contact of the oven power relay. Closing the oven power switch supplies line voltage to oven power relay, its contacts now close, supplying line voltage to the two main fan motors and the two burner circuits. Closing the oven power switch also supplies line voltage to the control box cooling fans, the temp. display, and the conveyor circuit.

BURNER CIRCUIT

NOTE: This oven utilizes two complete burner/ temperature control systems. The sequence of operations is the same for each system.

Closing the main fan switch supplies line voltage, through the oven power relay, through a three amp. fuse, through the gas pressure switch, through the main fan air pressure switch through the oven cavity hi-limit thermostat, to the ignition control. The combustion motor is energized. The normally open combustion air switch closes upon sensing air pressure. After a pre-purge period of between 30 and 60 seconds, the ignition transformer and the main gas valve are energized. Ignition should now occur.

TEMPERATURE CONTROL

Closing the oven power switch supplies line voltage, through the oven power relay, through a three amp. fuse, through the gas pressure switch, through the main fan air pressure switch through the oven cavity hi-limit thermostat, to the temperature control board. The 1.0K temperature pot. is adjusted to desired temperature. The thermocouple will provide varying millivolts to the temperature control. The temperature control supplies line voltage to the solenoid valve at intermittent intervals to maintain desired temperature.

CONVEYOR DRIVE

Closing the oven power switch supplies line voltage, through the oven power relay, through the electromagnetic filter to the conveyor control. AC volts are converted to DC volts and are supplied to the conveyor motor at terminals A+ and A-.

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