Service manual

9001900 9
© Copyright, Alliance Laundry Systems LLC – DO NOT COPY or TRANSMIT
Section 3
Theory of Operation
Starting the Machine
The door lock will not allow a cycle to be started until
the door has been closed.
Fill
The operator selects a cycle and starts the machine.
Water enters the machine through water valves that are
controlled by the microcomputer. As water fills the
basket, a column of air is trapped in a pressure bulb
and hose. The air pressure continues to increase as the
basket fills with water. When the desired water level is
reached, the water level switch triggers the
microcomputer and the water valves turn off.
A vacuum breaker installed in the inlet plumbing or a
shell overflow and air gap prevents the backflow of
water.
Supply
The operator can either connect external liquid
supplies to the machine or fill the supply dispenser
with liquid or dry supplies. The supply dispenser's
nozzles flush the compartments with water at the
appropriate times throughout a cycle.
Wash
The basket includes ribs that lift the laundry from the
wash water. The laundry then tumbles back into the
bath.
A variable-speed motor drives the basket's shaft with a
V-belt.
The bearing housing is mounted to the tub support's
brackets. The tub support is mounted onto the frame
with shock absorbers so it can move independently
from the frame.
Drain
Standard models include a normally-open gravity-type
drain system. When the drain valve opens, the
perforated basket allows water to drain from it. A
pump drain is available as an option on the smaller-
capacity models.
In the event of a power failure, the drain valve will
open automatically and the machine will drain.
Standard models include a single drain valve. On dual
drain models, which are available as an option, the two
drain valves open and close together.
Extract
A final high-speed extract step removes water from the
load, which maximizes drying efficiency.
The door lock system will not allow the door to be
opened until the cycle has finished.