Blower Motor - Pratica Chef Express Service Manual

IMPINGEMENT SYSTEM
70
The Chef Express impingement system utilizes different components to heat, filter and recirculate
air into the cook cavity rapidly.

Blower Motor

The Chef Express oven utilizes a three-phase motor to spin the turbine clockwise and is controlled by
a frequency inverter (Speed Control).
Testing Blower Motor
WARNING: The blower motor is located on the back of the unit in between the microwave
circuits. For safety reasons, please unplug the unit and discharge the capacitors before
continuing repairs.
Please follow the instructions below to test the blower motor:
1) Unplug the oven and discharge the capacitors for safety purposes.
2) Remove the rear panel from the unit.
3) Unplug all 3 wires from the blower motor labeled V, W, U.
4) Check continuity across all 3 windings in different combinations.
• Each combination should have around 5.6 ohms (ex. V to W, V to U, W to U).
• If no continuity is present across the windings or if the continuity is significantly different
across one or more windings, replace blower motor.
5) If continuity reading is good, pull blower motor out and try to physically spin with your hand.
If blower motor wheel is seized, replace the blower motor.