2-1
THEORY OF OPERATION
On MXR55 and 65 washers the hot and cold
water inlet valves are connected to brass
ttings, that enter the washer from the back
and each has a removeable debris lter. The
manifold consists of a valve at the bottom, an
elbow, a coupling and a T tting. On MXR20-
40 washers the hot and cold water inlet valves
are mounted directly to the upper rear panel
and the plastic hose connections of the inlet
valve bodies are protruding through this rear
panel.
Cold water inlet valve solenoids are located
near the top back right corner of the washer.
The cold water inlet has a 4-way inlet valve
with a 3/4” inlet and 1/2” outlet.
Hot water inlet valve solenoids are located
near the top back center of the washer. The
hot water inlet has a 3-way inlet valve with a
3/4” inlet and 1/2” outlet.
Each group of valves is attached to a single
plastic manifold to make up a cold or hot water
inlet valve. These valves control water ow to
the individual cups in the chemical dispenser.
If both a hot and cold water inlet is open, it
can ll at up to 40 liters per minute, or up to 20
liters per minute with only one valve open.
Each solenoid has a 220 volt coil.
55 and 65 pound washers have an additional
3/4” water inlet valve that T’s off of each water
inlet manifold. These valves control water ow
to the chemical dispenser mixing chamber.
With the addition of the 3/4” valves, these
washers can ll at up to 50 liters per minute.
MOTOR POWER CIRCUIT:
When the mains disconnect is turned on,
power ows through the black and blue wires
to the contactor. The black and blue wires
enter the top of the contactor. The contacts
of the contactor close. Power ows out the
bottom of the contactor, through the black and
red wires, to the inverter. The inverter changes
the 220 volt single phase to 220 volt three
phase to run the motor.
CONTROLS POWER CIRCUIT:
When the mains disconnect is turned on,
power ows through the black and blue wires
to the contactor. The black and blue wires
enter the top of the contactor and the EMI
Filter. Two black and 2 blue wires exit the EMI
Filter. The smaller gauge wires go to the top 2
fuses on the rear of the washer and the larger
gauge wires go to the Contactor. The top
two fuses power the controls and the control
outputs including the Contactor Coil. In the
MXR40-65 there is an Isolating/Separating
Transformer that is positioned between the top
two fuses and the Control Boards. With the
Isolating Transformer the Black and Blue wires
go to the top of the Transformer (Primary)
and the Brown and White come off the bottom
(Secondary) without changing the voltage.
The Brown goes to the third and bottom fuse
and comes out of the fuse Red. The Red
wire then goes to a connector in the harness
along the top rail of the left side panel where
it is changed to brown and goes to the J_P
connector on either the Main Control on PN
models or on the Auto Release Control on PD
models.
WATER INLET VALVES POWER
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