Convertible heating and cooling food storage cabinet

Claim 1

A SYSTEM FOR MAINTAINING FOOD PRODUCTS AT ANY OF A PLURALITY OF SELECTED TEMPERATURES IN A RANGE FROM BELOW 0* F. TO ABOVE 200* F. COMPRISING A FOOD STORAGE CABINET HAVING SEPARATE COMPARTMENTS WITH SEPARATE ACCESS DOORS, A HEAT TRANSFER UNIT IN EACH COMPARTMENT OF THE CABINET HAVING A REFRIGERANT EVAPORATOR COIL AND ELECTRIC HEATING ELEMENT, A REFRIGERATION SYSTEM COMPRISING A COMPRESSOR, A CONDENSER, THE EVAPORATOR COILS IN THE COMPARTMENTS AND A METERING VALVE FOR EACH EVAPORATOR COIL, SAID REFRIGERANT SYSTEM HAVING SEPARATE REFRIGERANT LINES CONNECTING THE CONDENSER TO EACH OF THE EVAPORATOR COILS IN THE PLURALITY OF COMPARTMENTS, RESPECTIVELY, AND SEPARATE RETURN LINES FROM THE EVAPORATOR COILS TO THE COMPRESSOR, A NORMALLY-CLOSED SOLENOID-OPERATED CONTROL VALVE IN EACH OF THE SEPARATE REFRIGERANT LINES FROM THE CONDENSER TO THE EVAPORATOR COILS FOR SEPARATELY CONTROLLING THE SUPPLY OF ANY REFRIGERANT TO EACH OF THE PLURALITY OF EVAPORATOR COILS, AN ELECTRIC CONTROL HAVING SEPARATE SETS OF BRANCHES FOR EACH COMPARTMENT CONNECTED TO THE COMPRESSOR, THE SOLENOIDS FOR OPERATING THE CONTROL VALVES AND THE HEATING ELEMENTS, RESPECTIVELY, AT LEAST TWO SEPARATE BRANCH CIRCUITS FOR EACH COMPARTMENT BEING CONNECTED TO THE COMPRESSOR TO SELECTIVELY MAINTAIN EACH COMPARTMENT REFRIGERATED AT TEMPERATURES ABOVE AND BELOW FREEZING, A SELECTOR SWITCH FOR EACH SET OF BRANCHES OF THE CONTROL CIRCUIT FOR SELECTIVELY CONNECTING THE BRANCHES OF ITS SET IN DIFFERENT CIRCUITS, A THERMOSTATIC SWITCH IN EACH OF THE CIRCUITS SELECTIVELY CLOSED BY ITS SELECTOR SWITCH, AND SAID PLURALITY OF THE THERMOSTATIC SWITCHES CONTROLLED BY ONE SELECTOR SWITCH BEING RESPONSIVE TO THE TEMPERATURE IN THE COMPARTMENT AND SET TO OPERATE AT DIFFERENT TEMPERATURES TO START AND STOP OPERATION OF THE COMPRESSOR AND ELECTRIC HEATING ELEMENT TO PRODUCE AND MAINTAIN DIFFERENT TEMPERATURES IN A PARTICULAR COMPARTMENT WHEREBY BOTH COMPARTMENTS MAY BE COOLED AT THE SAME OR DIFFERENT TEMPERATURES OR ONE COMPARTMENT MAY BE COOLED WHILE THE OTHER IS BEING HEATED.