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The results of the long-term (15 days) continuous cryovacuum tests of the “SODART” telescope silicon detector cooler scale-down model are considered. The detector quasistationary thermal regime has been attained when simulated the heat fluxes flowing from Earth to cooler radiators. The cooler load characteristic is obtained at three values of the detector heat release. The data obtained were stated in terms of the real cooler system shows that with the detector useful load of 300 mW its temperature will not exceed 140 K in all orbit points including the Earth radiation belts. The data obtained have been used to calculate the full-scale model structure components temperature. The observation time for the above heat releases at different detector operation temperatures is also estimated.