Abstract: A self-contained ice making machine includes a programmable controller connected to control operation of the machine which includes monitoring the operation of the machine for producing diagnostic type error signals for display, and issuing operating instructions to the refrigeration unit. The refrigerator unit has a condenser with cooling fans, evaporator, a water supply means, and an ice harvest probe assembly. The evaporator includes a coil, and an array of ice cube molds. The water supply means includes a water tank for flowing water over the evaporator, a pump for pumping water to the evaporator and from the tank and a solenoid controlled valve for controlling the flow of water to and from the tank. The ice harvest probe assembly includes a probe driven by a slip clutch motor for pushing against an ice cube bearing slab formed on the evaporator during ice cube harvest.

Abstract: This invention relates to an improved method and apparatus for preventing overheating of the superheated vapors in a solar heating system using a refrigerant to collect heat from the atmosphere, the improvement consisting of sensing the amount of superheat contained in the superheated vapors leaving the collector and if an overheated condition is detected, bleeding off a portion of the refrigerant mixture entering the collector and mixing it with the overheated vapors to cool them down before they enter the compressor. The apparatus involved includes a thermostatic expansion valve responsive to the temperature of the superheated vapors leaving the collector and associated piping operative upon actuation to bypass a portion of the refrigerant mixture entering the collector around the later and mix it with the overheated vapors before they reach the compressor.