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Rack Control Module Operation
The timer controls the drive motor, wash pump and the MD-66 prewash pump.
The timer is internal to the RCM. The PUMPS output indicator light shows the RCM Timer is
active.
The timer output comes on when the rack switch opens, this turns on the PUMPS output.
When the rack switch closes the timer counts for 90-seconds.
After 90-seconds, the PUMPS output is turned off.
Inserting another rack during the timing resets the timer to 90-seconds.
The red input lights below show how the RCM inputs affect the timer’s operation,
START light ON - Enables automatic operation
STOP light ON - Disables automatic operation
RACK SWITCH light OFF - Starts the timer
TABLE LIMIT light OFF - Pauses the timer. Timing resumes when the light comes back on.
PAUSE
light OFF - Pauses the timer. Timing resumes when the light comes back on.
JAM light OFF - Stops the machine and disables automatic operation. The front panel Start
push button must be pressed to resume automatic operation and a dish rack
must be inserted to start the timer.
Rack Control Module (RCM) Operation
RCM Timer Operation
Run
AA
Prewash
DR Tank
Rinse Tank
Reset
RCM Status/Jumpers
NOT USED
NOT USED
RUN - ON when power is turned on to the RCM.
THIS RUN LIGHT DOES NOT MEAN THAT
THE DISHWASHER IS READY TO OPERATE.
JUMPERS:
Prewash - Enables the prewash input and output
functions.
AA, DR Tank, Rinse Tank - NOT USED
Reset Button - NOT USED
The RCM Status/Jumper Section contains one red indicator light
and four jumpers that are associated with the set-up of the RCM.
RCM Status and Jumper Section