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Selector Switch and Thermostats
(Mechanical Timer Models)
Depending on the model, the selector switch could be
a rocker selector switch with two selections or a push
button selector switch with from two to eight buttons and
consisting of from one to four switches.
Heated Dry
If the dishwasher has an option for "Heated Dry", this
switch will be in series with the element. When the timer
advances to the dry portion of the cycle, contacts will
close to apply power to the heating element. When
"ON" is selected, the contacts in the switch will be
closed, applying power to the element. If "OFF" is
selected, the contacts in the switch will be open.
Hi-Temp Wash
The selector switch has a selection for Hi-Temp Wash;
the switch is in parallel with a thermostat mounted on
the bottom of the tub and with a contact in the timer. The
selector switch, temp assure thermostat, and the temp
boost thermostat are all in series with the timer motor.
Both thermostats are normally open thermostats. When
the timer reaches the end of the second wash cycle, the
contact in the timer supplying power to run thetimer
motor will open. At which time, if the selector switch for
the Hi-Temp Wash has been selected, power to run the
timer motor must come through the thermostats. The
temperature of the water in the tub must rise to 137° ±
5° F for the thermostat to close and the timer motor to
advance. If the water temperature is below 137° ± 5° F,
the timer will pause until the heating element raises the
temperature of the water in the tub and allow the
thermostat to close.
Hi-Temp Rinse
If the selector switch was a selection for a Hi-Temp
rinse, the switch is in parallel with a thermostat mounted
in the tub, and the contact in the timer, the same as the
Hi-Temp wash. The operation for the Hi-Temp rinse will
be the same as for the Hi-Temp wash with the exception,
on some models, the temperature of the water in the tub
will be 150° ± 5° F for the thermostat to close to give a
sanitizing rinse.
High Limit Thermostat
The High Limit Thermostat is mounted on the bottom of
the tub in the left rear. This thermostat is a normally
closed thermostat. It is used as a safety in the event of
a component failure in the dishwasher. The thermostat
will open at 200°F and will reset at 100°F.
Page 18
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