Door Vent-450 Model; Circulation Motor - Viking VDB325 Service Manual

Service Diagnostics and Procedures
Control Board Diagnosis (continued)
(Some measurements require power and others require the unit not to be powered.)
Door Vent (450 model only)
At rest, the internal vent door is in the open
position. When a wash cycle is activated, 12 Volts
are sent to the wax motor. As the wax begins to
heat, this causes the internal lever to move, closing
off the vent door. This way, no steam is allowed to
escape drying the wash cycle.
During the dry cycle, the voltage is removed from
the wax motor, allowing it to cool. As it cools, the
internal lever retracts and allows the door to open.
Steam can now travel into the door channel to
begin condensing inside the channel.
Door Vent

Circulation Motor

The 325 and 450 series dishwasher utilizes a
three-phase AC induction motor with variable
speed capabilities. The motor is controlled by the
motor controller.
P5-1 and P5-2 sends 120 Volts to the motor
controller. The motor controller then coverts the
voltage to operate the three-phase motor.
Circulation Motor
© 2011 Viking Preferred Service
P-4
Main Control Board
P-2
Main Control Board
Motor Controller Board
Note: Testing the circulation motor can be
achieved in the diagnostic mode.
P-5
To P-2
To P-5
22