A method of operation for use in a refrigeration device comprising at least a first chamber with a relatively high operation temperature; at least a second chamber with an operation temperature lower than the first chamber; a refrigeration system cooling said chambers and having a compressor, a condenser, a capillary pipe and an evaporator; and at least one temperature sensor positioned in at least one of the chambers and measuring the temperature of a chamber so that the operation of the compressor is controlled based on the measured temperature, wherein the amount of product to be stored in a second chamber of a refrigeration device is increased without causing the operation temperature of the first chamber to drop below a predetermined value, the method of operation being characterized by comprising the following steps in the order given; - operating said compressor with the start of the refrigeration device; - sensing the temperature of the chamber including the sensor by means of the said temperature sensor; - controlling whether the sensed temperature value is higher than a predetermined target temperature; - if the sensed temperature is equal to or lower than the said target temperature, stopping operation of the compressor; - re-sensing the temperature of the chamber including the sensor after stopping the operation of the compressor; - re-controlling whether the temperature value sensed in the step is higher than the target temperature; - if the temperature value sensed in the step is higher than the target temperature, returning back to the step of operating the compressor; - if the temperature value sensed in the step is not higher than the target temperature, re-sensing the temperature of the chamber; - if the temperature sensed in the step of controlling whether the temperature value of the chamber including the sensor is higher than the said target temperature is higher than the target temperature, controlling whether the continuous operation period of the compressor is higher than a predetermined t1 value; - if the operation period of the compressor is lower than said t1 time, returning back to the step of measuring the temperature of the chamber including the sensor; - if the operation period of the compressor is higher than said t1 time, stopping operation of the compressor; - after the compressor is stopped, calculating the duration for which the compressor is kept at standby; - controlling whether the calculated duration in the step is lower than a predetermined t2 time; - if the duration calculated in the step for which the compressor is kept at standby is lower than said t2 time, returning back to the step of calculating the duration for which the compressor is kept at standby; - if the duration calculated in the step for which the compressor is kept at standby is equal to or higher than said t2 time, returning back to the step of operating the compressor. - operating said compressor with the start of the refrigeration device; - sensing the temperature of the chamber including the sensor by means of the said temperature sensor; - controlling whether the sensed temperature value is higher than a predetermined target temperature; - if the sensed temperature is equal to or lower than the said target temperature, stopping operation of the compressor; - re-sensing the temperature of the chamber including the sensor after stopping the operation of the compressor; - re-controlling whether the temperature value sensed in the step is higher than the target temperature; - if the temperature value sensed in the step is higher than the target temperature, returning back to the step of operating the compressor; - if the temperature value sensed in the step is not higher than the target temperature, re-sensing the temperature of the chamber; - if the temperature sensed in the step of controlling whether the temperature value of the chamber including the sensor is higher than the said target temperature is higher than the target temperature, controlling whether the continuous operation period of the compressor is higher than a predetermined t1 value; - if the operation period of the compressor is lower than said t1 time, returning back to the step of measuring the temperature of the chamber including the sensor; - if the operation period of the compressor is higher than said t1 time, stopping operation of the compressor; - after the compressor is stopped, calculating the duration for which the compressor is kept at standby; - controlling whether the calculated duration in the step is lower than a predetermined t2 time; - if the duration calculated in the step for which the compressor is kept at standby is lower than said t2 time, returning back to the step of calculating the duration for which the compressor is kept at standby; - if the duration calculated in the step for which the compressor is kept at standby is equal to or higher than said t2 time, returning back to the step of operating the compressor.