
806221 7
Introduction
Theory of Operation
General (Dryer)
The dryer uses heated air to dry loads of laundry.
When the motor is started, the exhaust fan pulls fresh
air in through louvers at the rear of the dryer and over
the heat source (burner flame for gas and heating
element for electric). The heated air moves through the
heater duct and into the cylinder, where it circulates
through the wet load. The air then passes through the
lint filter, air duct and exhaust fan, where it is vented
to the outdoors.
General (Washer)
This frontload washer provides some of the same
principles of operation as the typical topload washers.
It senses water level, it dispenses the desired laundry
detergent, agitates the clothes for good cleaning action,
removes the water out of the washer and spins the
clothing in preparation for the dryer.
The difference in operation is primarily the rotational
washing agitation created for the horizontal basket and
drum. This agitation tumbles the clothes in a clockwise,
pause, and counter-clockwise direction. This reversing
tumbling action provides an efficient washing process
and requires less laundry detergent and less water.
The cycle begins by locking the loading door after the
vend is satisfied. The type of cycle and water
temperature are determined by the appropriate pads on
the electronic control.
The inner basket starts agitating during the wash water
fill. A column of air is trapped in a pressure bulb and
hose. The air pressure continues to increase as the inner
basket fills with water with the pressure sensor
monitoring the water level.
The agitate step tumbles the clothing in a clockwise
direction for a period of time, pauses for a period of
time and then tumbles the clothing in a
counterclockwise direction for a period of time. This
agitation continues until the end of the wash cycle. The
machine then stops agitating and turns on the pump or
drain valve which removes the wash water.
Upon completion of the wash cycle, the machine goes
into a rinse cycle. Fresh cold water is brought into the
inner basket via the mixing valve until the fill level is
satisfied. The rinse cycle consists of agitation for a
predetermined amount of time then a spin mode with
the pump running where the machine goes into a series
of spins.
After all the rinse cycles have been completed, the
washer goes into a final spin cycle to extract as much
water as possible from the clothing to prepare them for
the dryer. The spin speeds and duration of this final
spin cycle are determined by the type of wash cycle
selected.
NOTE: Washer may not reach 1200 RPM because
of an out-of-balance condition. Control may limit
speed to 1000, 800, 650 or 500 RPM depending on
severity of out-of-balance condition.
Technical (Washer)
The basic operational system of this washer consists of
the electronic control, the inverter control, pressure
sensor, water valves, electric pump (or drain valve)
and A.C. motor.
The electronic control performs all control and timing
functions. The electronic control sends simple speed
and output commands to the inverter control via serial
communication. The drive control powers the door
lock, pump (or drain valve), motor, water valves and
heater (if equipped).
The drive control powers the A.C. motor and performs
all motor control functions. The drive control also
powers the water valves, dispenser valves and door
lock. The drive control is powered through the door
switch and electronic control. The drive control also
alerts the electronic control to any errors in the motor.
Before entering any spin step the drive control
measures out-of-balance. The drive control will try to
redistribute the clothes if an out-of-balance condition
exists by limiting the spin speed to several speeds
depending on the severity of the out-of-balance
condition. If the out-of-balance condition is severe
enough the drive control will limit speed to 90 RPM
and will not spin.
NOTE: An additional out-of-balance switch is used
to detect any out-of-balance condition during spins.
If this switch opens during a spin step, the drive
control immediately stops and then restarts the
spin.