25
402s Ovens Part. N
o.
32Z3539 Issue 5
PRINCIPAL COMPONENTS: Hot Air Motor & Controller 1
Convection and Fan Speed Control
The convection heat is provided by 5 elements located in the hot box at the rear of the oven
cavity. The hot air from the hot box passes over catalytic converters and is circulated into the
bottom and top of the cavity through the impinger plates. It returns through the removable grease
filter at the back of the cavity and into the fan.
Convection motor
The convection motor Is a 3-phase AC motor having a maximum speed of 7200 rpm controlled by
a motor speed controller.
The windings are thermally protected and in the event of a thermal fault a trip inside the motor will
operate and shut down the motor speed controller.
Motor/ controller fault finding
Electrical supply into motor controller
Three phase connections to motor
Speed Controller connections to logic board
Motor thermal cut-out (short circuit)
Motor rotates freely/ not seized
Motor winding resistances:
Blue-Black 3 Ohms—4 Ohms
Black-Brown 3 Ohms—4 Ohms
Brown-Blue 3 Ohms—4 Ohms
Black or Brown or Blue to Earth (Open circuit)
Step
1
2
3
4
5
6
8x 31Z4016
M5 Flange nut
SA208 Hot Air Motor Assembly
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