The normally open contacts now close, energizing the Main Fan Motor through two

 

10A fuses, and the Cooling Fan. Closing the Fan Switch also supplies power to 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.

CONVEYOR DRIVE

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

(S/N Q14790 & Below,

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

1200 series

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

S/N Q14973 & Below

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

1000 series)

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

 

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

(S/N Q14791 & Above,

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

1200 series refer to Pg.

generator. The tach. Generator is a DC voltage generator, which supplies a voltage

5 & 6 S/N Q14974 &

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

Above, 1000 series refer

conveyor speed.

to Pg. 5 & 6 (STEPPER)

 

NOTE:

The 1200 Series Ovens utilize 2 complete conveyor drive systems.

TIME/TEMP

The Time/Temp. Display is energized when the Fan Switch is closed, supplying 120

DISPLAY(S/N Q14790 &

VAC to the primary of the12.6 volt Transformer. The secondary output of the

Below, 1200 series

transformer, normally 13 to 14 VAC (depending on input), with a center tap, is

S/N Q14973 & Below

supplied to terminals 1,2, and 3 of the Time/Temp. Display. The center tap is

1000 series)

terminal 2. The display works on a balanced input and center tap voltage to each leg

 

must be 1/2 the total reading.

(S/N Q14791 & Above,

The speed side of the Time/Temp. Display uses a slotted disc (cemented to tach.

1200 series refer to Pg.

coupling) to break the infrared light beam of the optical switch (mounted on gear

5 & 6 S/N Q14974 &

motor) producing electrical pulses that are transmitted to the display. The display

Above, 1000 series refer

converts these pulses into a read-out of minutes and seconds. The temperature

to Pg. 5 & 6 (STEPPER)

portion of the display uses a Thermistor Probe to sense oven temperature. The

 

thermistor outputs a resistance proportional to the oven temperature. This resistance

 

is then converted by the display into a temperature reading.

NOTE*

The 1200 Series Ovens use a Double Pole Double Throw Switch to connect the two

 

Optical Encoder Assemblies to the Time/Temp. Display. By activating the switch,

 

either the front or rear belt speed can be shown by the Time/Temp Display .

CONVEYOR DRIVE

Closing the Oven Fan Switch supplies 120 VAC, through the Power Transformer, to

 

the normally open Conveyor Switch. Closing the Conveyor Switch supplies 120 VAC,

 

through a 3 AMP Fuse, to the primary of the Conveyor Control Transformer. The

 

secondary of this Transformer supplies 10 VAC and 29 VAC to the Conveyor

 

Control. The conveyor control supplies voltage pulses to the Conveyor Control. The

 

Conveyor Control Potentiometer varies the frequency of these pulses. The motor

 

speed will increase or decrease, as the frequency of the pulses increase or decrease

 

respectively.

6

Impinger I -–1000 Series Service Manual - Domestic

Page 6
Image 6
Lincoln 1400, 1200, 1000 service manual Burner Circuit, Time/Temp

1000, 1200, 1400 specifications

The Lincoln series, particularly the models Lincoln 1000, 1200, and 1400, represents an evolution in luxury vehicles, combining elegance with cutting-edge technology. Each model builds upon its predecessor while introducing features that enhance performance, comfort, and safety.

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In conclusion, the Lincoln 1000, 1200, and 1400 models showcase a remarkable journey of luxury and technology, with each iteration bringing forth innovative features and design enhancements that elevate the driving experience. As Lincoln continues to evolve, the commitment to craftsmanship, comfort, and cutting-edge technology remains central to its identity.