# US 12,007,153 B2 · Refrigeration cycle apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,007,153 B2 - Document ID: US12007153B2 - Status: Granted - Kind: B2 - Application number: 17/909,056 - Filed: 2020-05-20 - Published: 2023-03-23 - Granted: 2024-06-11 - Earliest claimed: 2020-05-20 - Assignees: Mitsubishi Electric Corporation - Applicants: Mitsubishi Electric Corporation - Inventors: Yasutaka Ochiai - Web page: https://patentgrep.com/patent/US12007153B2 ## CPC - F25B 49/025: {Motor control arrangements} - F24F 11/38: Failure diagnosis - F25B 2400/0409: for evaporators - F25B 2400/0411: for expansion valves or capillary tubes - F25B 2700/1931: Discharge pressures - F25B 2700/21162: of the refrigerant at the inlet of the condenser - F25B 2700/21163: of the refrigerant at the outlet of the condenser - F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS - F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02) ## Abstract A refrigeration cycle apparatus includes: a refrigerant circuit in which a compressor, a condenser, an expansion device, and an evaporator are connected by pipes, and refrigerant circulates; a high-pressure sensor that detects a pressure of the refrigerant on a discharge side of the compressor; a first temperature sensor that detects a temperature of the refrigerant on an outlet side of the condenser; and a controller that determines that the high-pressure sensor is abnormal, when the compressor is in operation and the temperature detected by the first temperature sensor is higher than a saturated liquid temperature or a saturated gas temperature that is calculated from the pressure detected by the high-pressure sensor. ## Claims ### Claim 1 A refrigeration cycle apparatus comprising: a refrigerant circuit in which a compressor, a condenser, an expansion device, and an evaporator are connected by pipes, and refrigerant circulates; a high-pressure sensor configured to detect a pressure of the refrigerant on a discharge side of the compressor; a first temperature sensor configured to detect a temperature of the refrigerant on an outlet side of the condenser; and a controller configured to determine that the high-pressure sensor is abnormal, when the compressor is in operation and the temperature detected by the first temperature sensor is higher than a saturated liquid temperature or a saturated gas temperature that is calculated from the pressure detected by the high-pressure sensor. ### Claim 2 A refrigeration cycle apparatus comprising: a refrigerant circuit in which a compressor, a condenser, an expansion device, and an evaporator are connected by pipes, and refrigerant circulates; a high-pressure sensor configured to detect a pressure of the refrigerant on a high-pressure side of the compressor; a temperature sensor configured to detect a temperature of the refrigerant which is in a saturated liquid state or a two-phase state; and a controller configured to determine that the high-pressure sensor is abnormal, when the compressor is in operation and the temperature detected by the temperature sensor is higher than a saturated gas temperature calculated from the pressure detected by the high-pressure sensor. ### Claim 3 (depends on 1) The refrigeration cycle apparatus of claim 1, further comprising: an additional temperature sensor configured to detect an ambient temperature of the condenser, wherein the controller is configured to determine that the first temperature sensor is abnormal when the compressor is in operation and the temperature detected by the additional temperature sensor is higher than the temperature detected by the first temperature sensor. ### Claim 4 (depends on 2) The refrigeration cycle apparatus of claim 2, wherein the controller is configured to determine that the temperature sensor is abnormal, when the compressor is in operation and the saturated gas temperature calculated from the pressure detected by the high-pressure sensor is higher than the temperature detected by the temperature sensor. ### Claim 5 (depends on 1) The refrigeration cycle apparatus of claim 1, further comprising a liquid reservoir provided between the condenser and the expansion device. ### Claim 6 (depends on 1) The refrigeration cycle apparatus of claim 1, further comprising: a bypass pipe that connects a location between the condenser and the expansion device and a location between the evaporator and the compressor; and a bypass valve provided at the bypass pipe. ### Claim 7 (depends on 2) The refrigeration cycle apparatus of claim 2, further comprising a liquid reservoir provided between the condenser and the expansion device. ### Claim 8 (depends on 2) The refrigeration cycle apparatus of claim 2, further comprising: a bypass pipe that connects a location between the condenser and the expansion device and a location between the evaporator and the compressor; and a bypass valve provided at the bypass pipe. ### Claim 9 (depends on 3) The refrigeration cycle apparatus of claim 3, further comprising a liquid reservoir provided between the condenser and the expansion device. ### Claim 10 (depends on 3) The refrigeration cycle apparatus of claim 3, further comprising: a bypass pipe that connects a location between the condenser and the expansion device and a location between the evaporator and the compressor; and a bypass valve provided at the bypass pipe. ### Claim 11 (depends on 4) The refrigeration cycle apparatus of claim 4, further comprising a liquid reservoir provided between the condenser and the expansion device. ### Claim 12 (depends on 4) The refrigeration cycle apparatus of claim 4, further comprising: a bypass pipe that connects a location between the condenser and the expansion device and a location between the evaporator and the compressor; and a bypass valve provided at the bypass pipe.