Abstract: A novel control logic for an individual cube spray type ice machine. The duration of the freeze cycle is able to adapt to changes in inlet water temperature, changes in ambient air temperature, and the impact of warm temperatures of internal ice making parts within the ice machine due to off cycle periods. This is accomplished through a combination of starting a freeze time period only after the water temperature for the volume of water circulating over the evaporator has reached approximately 32° F., and a freeze time period value that is a function of the refrigerant temperature leaving the condenser at the time where the water reaches approximately 32° F.

Abstract: An ice-making machine having an ice-forming surface upon which ice is formed, a refrigeration system including a microchannel evaporator that cools the ice-forming surface, and a water-supply system. The microchannel evaporator includes a microchannel tube that facilitates a distributed cooling effect in a contact area between the microchannel tube and the ice-forming surface. In some embodiments, the microchannel tube includes a series of recessed portions that define insulated regions and divide the tube into non-insulated regions. The insulated and non-insulated regions can be dimensioned to form individual ice cubes on the ice-forming surface. In other embodiments, spaces between microchannel tubes and/or spaces between the ice-forming surface and microchannel tubes can form insulated regions at least partially defining the size and shape of ice produced by the ice-making machine.