Control board alarms

An electronic control board for controlling a refrigeration machine comprising:

• a micro-control unit located on said control board;
• a voltage monitor for continuously monitoring a supply voltage and inputting a signal to said micro-control unit representative of a voltage level;
• an electronic circuit connected to said micro-control unit for producing a delay time period in which alarm functions controlled by said control board are temporarily disabled for allowing starting of the refrigeration machine;
• an electronic memory circuit for storing data relating to detected abnormal operational occurrences and connected to said micro-control unit;
• and
• a switch connected to the control board for electrically reconfiguring the electronic control board;
• wherein said data stored in said electronic memory circuit is accessible by an interface device.

A method for controlling a refrigeration machine comprising:

• detecting a zero crossing of a current in a supply voltage supplying the refrigeration machine;
• indicating the position of a float switch to a controller which controls the refrigeration machine;
• controlling an output of a hot gas to defrost a compartment in said refrigeration machine;
• controlling a water pump for supplying water to said refrigeration machine;
• controlling a water valve for draining or supplying water to said refrigeration machine;
• monitoring environmental operating conditions existing in said refrigeration machine;
• storing data relating to detected abnormal operating conditions in a memory located on said controller;
• and
• controlling an alarm to indicate that a detected abnormal operating condition exists in said refrigeration machine.

An electronic control board for controlling a refrigeration machine comprising:

• a micro-control unit located on said control board;
• means for continuously monitoring a supply voltage and inputting a signal to said micro-control unit representative of a voltage level;
• means connected to said micro-control unit for producing a delay time period in which alarm functions controlled by said control board are temporarily disabled for allowing starting of the refrigeration machine;
• and
• means for storing data relating to detected abnormal operational occurrences connected to said micro-control unit;
• wherein said data stored in said storing means is accessible by an interface device.

An electronic control board for controlling a refrigeration machine comprising:

• a micro-control unit located on said control board;
• means for continuously monitoring a supply voltage and inputting a signal to said micro-control unit representative of a voltage level;
• means connected to said micro-control unit for producing a delay time period in which alarm functions controlled by said control board are temporarily disabled for allowing starting of the refrigeration machine;
• means for storing data relating to detected abnormal operational occurrences and connected to said micro-control unit;
• and
• means for electrically reconfiguring the electronic control board connected to the control board;
• wherein said data stored in said storing means is accessible by an interface device.