Lincoln Impringer Conveyor Oven 1200 Manuel d'utilisateur télécharger pdf (Page 4)

Impinger I -–1000 Series Service Manual - International

TIME TEMP DISPLAY The Time/Temp Display is energized when the Fan Switch is closed, supplying 120

VAC to the primary of the 12.6 volt Transformer. The secondary output of the

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

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

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

1/2 the total reading.

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

coupling) to break the infra-red light beam of the optical switch (mounted on gear

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

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

The temperature 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.

SEQUENCE OF OPERATIONS 1106

MODEL 1006 - 240 VAC - 50HZ - 1 PHASE - NATURAL GAS

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

Red conductor is Hot

Black conductor is Neutral

Green conductor is Ground

CONTROL BOX AUTO

COOL DOWN

When the temperature in the Control Box reaches 120°F + 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, and through a 3A Fuse to 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 to the primary of the control circuit Step Down

Transformer. (The transformer steps the voltage down to 120VAC for the control

circuit) 120 VAC is supplied to the coil of the 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

VAC)

Upon closure of the Fan Switch, 120 VAC is supplied to the primary of the 12.6 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 normally open contacts of the Burner Motor

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

secondary supplies 24 VAC to the coil of the Burner Motor Relay (the normally open

contacts close within 30 seconds), and through the Burner Air Pressure Switch to 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., the Burner Air

Pressure Switch closes, and the motor's 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 4390 AND UP)

Closing the fan switch and the normally open 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 (5000 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

1 2 3 4 5 6 7 8 9 ... 111 112

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Lincoln Impringer Conveyor Oven 1200 Manuel d'utilisateur Page 4

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