Dual temperature refrigeration system

Claim 1

A dual temperature refrigeration system comprising: a compressor unit supplying a flow of refrigerant; a first evaporator coil having an input end connected to said compressor for receiving refrigerant therefrom; a capillary tube connected between said compressor and said first evaporator coil for causing said refrigerant flowing through said first evaporator coil to reduce the temperature of said first evaporator coil and the surrounding medium to a first predetermined temperature; a return conduit extending to said compressor unit; a restrictor tube having one end connected to the output end of said first evaporator coil; a second evaporator coil connected between the other end of said restrictor tube and said return conduit; a by-pass conduit extending between said output end of said first evaporator coil and said return conduit; switch means provided in said by-pass conduit for selectively opening and closing said by-pass conduit for directing the main flow of refrigerant from said first evaporator coil either through said by-pass conduit or said restrictor tube and said second evaporator coil; said restrictor tube causing said refrigerant flowing through said second evaporator coil to reduce the temperature of said second evaporator coil and the surrounding medium to a second predetermined temperature lower than said first temperature; a carbonation tank having water therein; said second evaporator coil being coiled around said tank for producing an ice bank in said tank when refrigerant is permitted to flow through said second evaporator coil; a liquid dispensing coil carried in heat transfer relation with said first evaporator coil having one end connected to a source of water and the other end terminating in said carbonation tank so that water flowing through said liquid dispensing coil is chilled by said first evaporator coil prior to said water entering said carbonation tank wherein the temperature of said chilled water is reduced even further for enhancing carbonation; a first thermostat carried adjacent said liquid dispensing coil for energizing and opening said switch means when said temperature of said liquid coil rises above a predetermined level; and a second thermostat carried in said water in said tank for energizing said compressor unit when said water rises above a predetermined temperature.