Thermostats and Temperature Indicators
ASam-Wash or High Temperature Wash/Rin.se Thermostat
Most dishwashers are equipped with a thermostat to provide for guaranteed hot water in the 2nd Wash and/or Final Rinse when a
If the water temperature in the tub is below the thermostat setting the switch remains open and the timer motor does not run, prolonging the rinse cycle until the water temperature rises to the thermostat setting When this temperature is reached, the bimetal strip within the thermostat deflects and doses the contacts (dosing the circuit to the time_- m6tor) and the timer resumes operation to complete the dishwashing cycle; See Figure 58
--THERMOSTAT INSTALLED
"MYLAR JACKET
CROSS SECTION OF THERMOSTAT
FIGURE58
The heater in the machine will raise the water temperature approximately one degree per minute Thus, if the water is 135 degrees at the start of the Second Wash or Fourth Rinse and the thermostat is calibrated to 150 degrees, the timer will stop for approximately 15 minutes in the Second Wash or Fourth Rinse (or both) while the water is being heated, During the time that the thermostat is calling for'heat, there is no power to the timer motor although the wash system continues to function
Depending on the model dishwasher, the thermostat may be calibrated at 140° to 150 ° Some Lady Kenmore models contained 2 thermostats; one which is a round disk type, and the other which is of a tubular design The
disk type is calibrated for t50 °, and the tubular type is calibrated for 1200
B_ Checking Thermostat Operation
If the second wash or final rinse cycle is not delayed (when a
1, Check for incorrect wiring (use schematic).
2, Check for a defective thermostat Contacts should be open when cold,
3.Check for short in thermostat circuit.
4Check for too low a calibration of the thermostat, Thermostat calibration may be determined by measuring the temperature of the water expelled from the machine following a thermostatic delay
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