Lincoln Impinger Conveyor Ovens 1634-000-EA - Manual (Page 17)

Low Profile – 1600 Advantage Series Service Manual – International 17
H. ( note location of fan blade for reinstallation )
I. Loosen lock nuts on cone. Remove 2 mounting bolts and remove motor from
J. back assembly.
K. Remove 4 hex head screws from motor mount bracket. Remove motor mount from motor and
reinstall on new motor.
L. Reassemble in reverse order.
M. NOTE: 1. Make sure motor is centered in back housing.
N. 2. Verify correct location of fan blade and that it is not hitting fan shroud.
O. 3. Make sure all connectors are properly seated and making good contact.
P. 4. When reinstalling gas manifold across back of oven, check all fittings for leaks.
Q. Check system operation ( allow 30 minute preheat for all checks ) NOTE: Position of the fan
on the motor shaft will be 1.875” from the top of the oven back cone to the blade spider
assembly on the fan hub. ( see drawing below ).
THERMOCOUPLE ( TYPE J ) – REPLACEMENT
A. Remove control box covers. Remove motor cover and remove oven back to access
thermocouple.
NOTE: Removal of oven back assy. Is required to replace thermocouples.
B. Remove thermocouple from wire form in oven chamber and remove from chamber. NOTE: R.
H. thermocouple ( viewed from front ) is connected directly to the temperature control board,
remove 2 wires , make note of wire colors and location. When changing L. H> thermocouple (
viewed from front , the back motor cover must also be removed to gain access to the
thermocouple connector plug.
C. Reassemble in reverse order making sure bulb is placed securely in the wire form in the oven
chamber.
D. Check system operation, recalibrate as needed. NOTE: The R. H. and L. H. thermocouples
have different connectors on the wire ends and must be ordered accordingly.
INFORMATION :
When two wires composed of dissimilar metals are joined together and one of the ends is heated,
a continuous current flow as generated. We use an iron constant ( type J ) thermocouple. The
iron wire increases the number of dissimilar junctions.
It is possible to check a thermocouple with a properly calibrated D. C. millivolt meter. At 32
° F, the
millivolt reading should be 0.00. This can be checked by inserting the thermocouple into an ice
bath.
The millivolt reading at 72 ° F should be 1.134.
When using the following chart, the temperature at the terminal connections must be noted. This
temperature is called the junction temperature.