Importance

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Abstract

A liquid chemical dispensing system for dispensing a plurality of liquid chemicals into a dishwasher includes at least a detergent pump and a rinse agent pump, a first switch indicating whether the dishwasher is a door type or a conveyor type dishwasher, a second switch indicating whether the controller is in training mode or in run mode, a non-volatile memory and a data processor. The liquid chemical dispensing system is powered on whenever the dishwasher is spraying rinse water. In the training mode, the data processor enables a user to set values for a rinse run time parameter, a detergent run time parameter, and a rinse delay time, and stores those parameters in the non-volatile memory. In the run mode for door type dishwashers, each time the system is powered on the data processor runs the detergent pump a length of time corresponding to the stored detergent run time parameter, delays running the rinse pump, from the time of each power on, by an amount of time corresponding to the stored rinse delay time parameter, and then runs the rinse pump a length of time corresponding to the stored rinse run time parameter. In the run mode for conveyor type dishwashers, the data processor runs the rinse pump each time the system is powered on, and runs the detergent pump for N seconds for each M seconds that the rinse pump is run, where N is the detergent run time parameter and M is a predefined value.

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First Claim