Lincoln 1100 Series Service Manual page 34

TEMPERATURE CONTROL BOARD
NOTE: If your unit contains a Fenwal temperature control board, (see below) replace it with a thermologic
control board.
TEMPERATURE CONTROL BOARD CONVERSION - FENWAL TO THERMOLOGIC
(FOUND ONLY IN ELECTRIC UNITS BELOW S/N 2000861)
1. Remove Fenwal board.
2. Remove 5K ohm potentiometer
3. Remove wire #63 from oven. This wire is connected to Fenwall board at terminal #5.
4. Install new thermologic board with 2 screws.
5. Install new 2.5K ohm potentiometer.
6. Attach leads to thermologic board as shown in drawings. See pages 34 & 35.
Located in control compartment below drive end of the conveyor
1. Shut off power at main breaker and remove conveyor.
2. Remove front control compartment cover.
3. Remove the two mounting screws.
4. Remove the electrical leads and replace the control board.
5. Identify the style of thermologic board by looking at the top of the transformer
on the board. There are five styles of boards, each identified by a color marked
on the transformer, either RED, BLUE, GREEN, GOLD, OR A SILVER DOT. Refer to Pages 34 & 35
showing proper wiring connection.
6. NOTE: When mounting a new temperature control board, DO NOT over tighten the two mounting screws.
7. Turn the potentiometer fully counterclockwise.
8. Loosen the Dial/Knob set screw and position the 50° F mark at the pointer.
NOTE: The thermocouple of your test meter should be inserted through a finger hole
in the top center of the oven, and the oven pre-heated for 30 minutes to stabilize
the oven at set temperature. The thermocouple probe must not touch metal, it must
sense air temperature only.
9. Adjustment of the GREEN, GOLD OR SILVER dot control board may be required when installing a new
board. Adjustment is seldom required on RED and BLUE boards.
10. For RED or BLUE control boards with the temperature control dial at maximum,
the reading on your temperature test meter should be between 555° F (290° C)
and 575° F (302° C). If not at this temperature adjust pot P3 to achieve these
figures. Refer to page 35.
11. For the GREEN, GOLD OR SILVER dot control board, place the test probe of your meter in position as
indicated in prior note. Set the oven temperature control dial 500° F(260°C), adjust pot P6 (see page 34) to
achieve a temperature reading on test meter of 500° F(260° C). CCW to increase, CW to decrease.
12. Adjust Time/Temp Display Pot. "Temp Cal" for 500° F(260°C).
BLACK
THERMOCOUPLE
TYPE J
34
RED POTENTIOMETER
2.5 K OHMS
1
P 6 P 5
2
3
WHITE
+
6 P 3
- 7
TRANSFORMER MARKED
WITH GREEN,GOLD OR
SILVER DOT
L 1 120 VAC
11
L 2
10
9
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Impinger II –1100 Series Service Manual - Domestic