SEQUENCE OF OPERATIONS 1042 / 1043 / 1242 / 1243

 

MODEL 1042 - 240V - 50HZ - NATURAL GAS

 

MODEL 1043 - 240V - 50HZ - L.P. GAS

 

MODEL 1242 - 240V - 50HZ - NATURAL GAS/DUAL BELT

 

MODEL 1243 - 240V - 50HZ - L.P.GAS/DUAL BELT

 

 

 

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 AUTO

 

When the temperature in the Control Box reaches 120°F + 3°, the Cooling Fan

COOL DOWN

 

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 at 140°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, the 12.6 VAC Transformer the Burner and Conveyor Switches.

TRANSFORMER (12.6

 

Upon closure of the Fan Switch, 120 VAC is supplied to the primary of the 12.6 VAC

VAC)

 

Transformer. The Transformer steps the voltage down to 12.6 VAC (normally 13 to

 

 

14 VAC) with a center tap, and supplies power to the Time/Temp Display. The

 

 

voltage from each leg of the Transformer©s secondary to the center tap should be

 

 

one half of the secondary voltage.

BURNER CIRCUIT

 

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

 

 

through the Air Pressure Switch, to the Temperature Control Board, the normally

 

 

open contacts of the Burner Motor Relay (Burner Motor Relay discontinued after S/N

 

 

14791) and the primary of the 24 VAC Transformer. The transformer©s secondary

 

 

supplies 24 VAC to the burner motor 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 approx.

 

 

1,600 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.

TEMPERATURE

 

Closing the Fan Switch and Burner Switch supplies 120 VAC to the Temperature

CONTROL

 

Control Board. The 1K or 1000 ohm Temperature Potentiometer is adjusted to

 

 

desired temperature. The Thermocouple will provide varying millivolts to the

 

 

Temperature Controller. The Temperature Controller supplies 120 VAC to the

 

 

Solenoid Valve at intermittent intervals to maintain desired temperature.

 

 

Closing the fan switch and the normally open conveyor switch supplies 120 VAC to

CONVEYOR DRIVE

 

the Motor Control Board. AC volts are converted to DC volts and are supplied to the

(S/N Q14790 & Below,

 

Conveyor Motor at terminals A+ and A-. Adjustment of the Speed Control

1200 series

 

Potentiometer (5,000 ohm 10 turn ) will change resistance at terminals P1, P2, and

S/N Q14973 & Below,

 

P3 varying the DC voltage to the motor. The speed of the conveyor motor will

1000 series)

 

increase or decrease as the DC voltage from the board increases or decreases

 

 

respectively. As the motor turns, it drives both the reducer gearbox and the tach.

(S/N Q14791 & Above,

 

generator. The tach. generator is a DC voltage generator which supplies a voltage to

1200 series

 

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

S/N Q14974 & Above,

 

conveyor speed.

1000 series refer to

 

 

Pg. 9)

 

 

10

Impinger I -–1000 Series Service Manual - International

Page 10
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Lincoln Series 1000, Series 1200 Sequence of Operations 1042 / 1043 / 1242, Model 1242 240V 50HZ Natural GAS/DUAL Belt

Series 1000, Series 1200 specifications

The Lincoln Series 1200 and Series 1000 are two distinguished models in the range of Lincoln Electric welding machines, epitomizing quality, versatility, and advanced technology for both industrial and residential welding applications.

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