GE PDW8900 Series Technical Service Manual page 28

The Single Rack WashTM bypasses the lower spray
/-
.
arm, directing the water flow only to the upper
rack.
A
plastic-covered steel ball, released by a wax
motor-controlled magnet, is forced by the water
flow to block the venturi
for the lower spray
arm.
Cleaning power is directed to the top basket ONLY
through the middle and upper spray arms. In Single
Rack WashTM, the tub fills with approximately 0.1 to
0.2 gals. less than a normal wash cycle.
Single Rack WashTM
Cycle:
The pump fills with water
to the level indicated. At the same time, the wax
motor energizes and pulls the magnet away. This
releases the ball from its position at the bottom of
the guide rail.
The impeller spins counterclockwise to a high
velocity. The water flows from the impeller and
carries the ball up the guide rail. The ball wedges
into the low-arm channel restricting the flow from
the lower spray arm. The water flow is now diverted
to only the upper and middle spray arms.
Normal Wash Cycle: The pump fills with water
to the level indicated. The magnet on the end of
the wax motor holds the ball out of the water flow
path. The impeller spins counterclockwise to a high
velocity. Water flowing from the impeller outward,
fills all chambers.
Normal Wash Cycle
Single Rack WashTM Cycle
Line
.t
-Water
Fill
Line