Lincoln Impringer Conveyor Oven 1200 Manuel d'utilisateur télécharger pdf (Page 3)

Impinger I -–1000 Series Service Manual - International

SEQUENCE OF OPERATIONS 1002/1003

MODEL 1002 - 240VAC - 50HZ - NATURAL GAS

MODEL 1003 - 240VAC - 50HZ - L.P. GAS

POWER SUPPLY Electrical Power to be supplied to the Oven by a three conductor service.

Black conductor is Hot

Red conductor is Neutral

Green conductor is Ground

CONTROL BOX When the temperature in the Control Box reaches 120°F +

AUTO COOL DOWN 3°, 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°.

MAIN FAN CIRCUIT Electrical power is permanently supplied to the normally open contacts of the Double

Pole Main Fan Relay, the Cooling Fan Thermostat, the normally open Double Pole

Main Fan Switch, and the normally open Cool Down Thermostat (thermostat closes

at 160°F and opens at140°F). Closing the Main Fan Switch supplies 240 VAC

through a 3A Fuse to the primary of the control circuit Step down Transformer. The

Transformer steps the voltage down to 120 VAC for the control circuit. 120 VAC is

supplied to the coil of the Double Pole Main Fan Relay. The coil of the relay is

energized. The normally open contacts now close, energizing the Main Fan Motor

through one 10A Fuse. Closing the Fan Switch also supplies power to the Cooling

Fan, Hour Meter (hour meter discontinued after S/N 3484), the 12.6 VAC

Transformer, the Burner and Conveyor Switches.

BURNER CIRCUIT

Closing the Fan Switch and the normally open Burner Switch supplies 120 VAC

through the Air Pressure Switch, to the normally open contacts of the Burner Motor

Relay, and the primary of the 24 VAC Step Down Transformer. The Transformer

secondary supplies 24 VAC to the Relay Coil (the normally open contacts close

within 30 seconds), and the normally open Centrifugal Switch. When the Relay

contacts close, the Burner Blower Motor is energized. As this motor reaches

approximately 1600 R.P.M., its internal centrifugal switch closes, supplying 24 VAC

to the Gas Control Valve. When the Gas Control Valve is supplied with 24 VAC, the

pilot valve is energized, and the igniter circuit is energized. Ignition should now

occur. After pilot flame is proven, the main gas valve is energized. The Burner

Indicator Light is also energized.

CONVEYOR DRIVE

(S/N 100 to 4389)

Closing the Fan Switch and the normally open Conveyor Switch supplies 120 VAC

through a 3A Fuse, to the Motor Control Board. AC volts are converted to D.C. volts

and are supplied to the Conveyor Motor at board terminals A1 and A2 through a

D.P.D.T. Reversing Switch. Adjustment of the Speed Control Potentiometer (500

ohm, 10 turn) will change resistance at terminals S1, S2, and S3 varying the D.C.

voltage to the motor. The speed of the Conveyor Motor will increase or decrease as

the D.C. voltage from the Motor Control Board increases or decreases respectively

(S/N 4390 and UP)

Closing the fan switch and the conveyor switch supplies 120 VAC to the Motor

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 (5,000

ohm 10 turn) will change resistance at terminals P1, P2, and P3 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. As the motor

turns, it drives both the reducer gear box and the tach. generator which supplies a

voltage to the DC motor control board and is used as a reference for maintaining a

constant conveyor speed

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Lincoln Impringer Conveyor Oven 1200 Manuel d'utilisateur Page 3

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