Lincoln 1628-000-A - Manual (Page 11)

Low Profile – 1600 Series Adv Dig Electric S.M. – Int’l 11
COOLING FAN MOTOR – REPLACEMENT
A. Shut off power at main breaker.
B. Remove appropriate control box cover.
C. Remove 4 mounting screws.
D. Unplug electrical connector and remove fan motor.
E. Reassemble in reverse order and check system operation.
MAIN FAN MOTOR – REPLACEMENT
A. Shut off power at main breaker.
B. Shut off gas supply and remove gas line and manifold lines from back of oven.
C. Remove screws from motor cover housing and lift off.
NOTE: When ovens are stacked, all motor cover housings are fastened together.
D. Unplug power connector.
E. Unplug thermocouple.
F. Unplug 2 motor connectors.
G. Remove 8 bolts from oven back ( 4 left, 4 right ) and lift out.
H. Remove 1 screw from fan hub and slide fan blade off of motor shaft. ( note location of fan blade
for reinstallation )
I. Loosen locknuts on cone. Remove 2 mounting bolts and remove motor from back assembly.
J. Remove 4 hex head screws from motor mount bracket. Remove motor mount from motor and
reinstall on new motor.
K. Reassemble in reverse order. NOTE: 1. Make sure motor is centered in back housing.
2. Verify correct location of fan blade and that it is not hitting fan shroud.
3. Make sure all connectors are properly seated and making good contact.
4. When reinstalling gas manifold across back of oven, check all fittings for leaks.
L. 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 K) – REPLACEMENT
A. Shut off power at main breaker.
B. 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.
C. 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.)
D. Reassemble in reverse order making sure bulb is placed securely in the wire form in the oven
chamber.
E. 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.
THERMOCOUPLE MEASUREMENT
TEMPERATURE (
° F) D.C. MILLIVOLTS
200 ° 2.8
250 ° 4.0
300 ° 5.1
350 ° 6.0
400 ° 7.1
450 ° 8.2
500 ° 9.3
550 ° 10.4
600 ° 11.5