To make it possible to prevent excess cooling of a cooler and enhance operability with higher efficiency even when a motor-driven damper is opened and closed.
Based on a freezer compartment setting temperature of a freezer compartment 8 predetermined with a freezer compartment setting means 23 where the rotational speed of a fan 14 which feeds air to a cooler 13 and the rotational speed of a compressor 17 determined with a rotational speed arithmetic operation means 25, the temperature of the cooler 13, which is lower than the setting temperature of the freezer compartment and capable of operating the compressor 17 with higher efficiency is set to a cooler differential temperature arithmetic operation means 37 with a cooler temperature setting means 36 as a cooler setting temperature. The differential temperature between the cooler temperature detected with a cooler temperature sensor 38 and a cooler setting temperature is computed with a cooler differential temperature arithmetic operation means 37 and the rotary speed 14 is controlled with a fan rotational speed arithmetic operation means 39 based on the differential temperature, thereby maintaining the cooler 13 near the cooler setting temperature.
KAMITSUJI TOSHIO
ODA MASATAKA
KURIMOTO KAZUNORI
