# US 10,871,317 B2 · Apparatus and method for indicating status of multi-phase vacuum-assisted recovery of refrigerant > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,871,317 B2 - Document ID: US10871317B2 - Status: Granted - Kind: B2 - Application number: 15/161,923 - Filed: 2016-05-23 - Published: 2017-11-23 - Granted: 2020-12-22 - Earliest claimed: 2016-05-23 - Assignees: Snap-on Incorporated - Applicants: Snap-on Incorporated - Inventors: Craig Govekar; Rahhali Sanhaji - Web page: https://patentgrep.com/patent/US10871317B2 ## CPC - F25B 45/00: Arrangements for charging or discharging refrigerant - B60H 1/00585: {Means for monitoring, testing or servicing the air-conditioning} - B60H 1/00985: {Control systems or circuits characterised by display or indicating devices, e.g. voice simulators (characterised by the input of sound using a voice synthesizer B60H1/00757; B60H1/00978 takes precedence)} - F25B 31/002: {Lubrication} - F25B 41/20: Disposition of valves, e.g. of on-off valves or flow control valves (expansion valves F25B41/31) - F25B 43/003: {Filters} - F25B 43/02: for separating lubricants from the refrigerant - F25B 2345/001: Charging refrigerant to a cycle - F25B 2345/002: Collecting refrigerant from a cycle - F25B 2345/003: Control issues for charging or collecting refrigerant to or from a cycle - F25B 2345/005: Service stations therefor - F25B 2700/03: Oil level - F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS - B60H: ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES ## Abstract The disclosure relates to apparatuses and methods for indicating status of multi-phase vacuum-assisted recovery of refrigerant from a vehicle. One apparatus for multi-phase vacuum-assisted recovery of refrigerant from a vehicle includes a compressor that removes refrigerant from the vehicle during a first phase and a second phase of a recovery process. The apparatus also includes a vacuum pump to assist the compressor in the removal of refrigerant from the vehicle during a second stage of the recovery process. Further, the vacuum pump is fluidly connected in series with the compressor during the second phase of the recovery process. The apparatus additionally includes one or more status lights and at least one processor to determine a status of the recovery process. At least one of the status lights is illuminated to represent a status of the recovery process, and at least one is visible from 360 degrees around the apparatus. ## Claims ### Claim 1 An apparatus comprising: a compressor configured to remove refrigerant from a vehicle during both a first phase of removing refrigerant from the vehicle and a second phase of removing refrigerant from the vehicle and to compress refrigerant in a gaseous state; a vacuum pump configured to assist the compressor in removing refrigerant from the vehicle during the second phase of removing refrigerant from the vehicle, wherein the vacuum pump is fluidly connected in series with the compressor during the second phase of removing refrigerant from the vehicle; a storage tank configured to store refrigerant removed from the vehicle; a condenser configured to transform refrigerant from the gaseous state to a liquid state; one or more status lights; and one or more processors programmed to stop the vacuum pump from assisting the compressor in removing refrigerant from the vehicle by disengaging the vacuum pump and afterwards illuminate at least a first status light of the one or more status lights to indicate a ready status of a recovery process that includes both the first phase of removing refrigerant from the vehicle and the second phase of removing refrigerant from the vehicle, wherein the first status light is visible from 360 degrees around the apparatus in a respective horizontal plane projected outward from the first status light; and wherein the one or more processors are configured to control a first switch to divert the refrigerant from the vehicle around the vacuum pump by being closed during the first phase of removing refrigerant from the vehicle and to permit the refrigerant from the vehicle to flow to the vacuum pump by being open during the second phase of removing refrigerant from the vehicle; wherein the one or more processors are configured to control a second switch to divert the refrigerant from the vehicle around the vacuum pump by being open during the first phase of removing refrigerant from the vehicle and to be closed during the second phase of removing refrigerant from the vehicle, and wherein the first switch includes a first valve and a first solenoid, and the second switch includes a second valve and a second solenoid, or wherein the first switch and the second switch are configured as a single three-way valve. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the one or more processors are further programmed to determine a second status of the apparatus and to illuminate a second status light of the one or more status lights, and wherein the second status comprises an in-progress status. ### Claim 3 (depends on 2) The apparatus of claim 2, wherein the one or more processors are further programmed to determine a third status of the apparatus and to illuminate a third status light of the one or more status lights, and wherein the third status comprises a user input required status. ### Claim 4 (depends on 1) The apparatus of claim 1, further comprising: one or more pressure sensitive devices, each configured to measure a first pressure and/or a second pressure in the apparatus, wherein the vacuum pump begins assisting in response to the first pressure in the apparatus, as measured by at least one of the one or more pressure sensitive devices, being less than a first threshold pressure, wherein the vacuum pump ceases assisting in response to the second pressure in the apparatus, as measured by at least one of the one or more pressure sensitive devices, being less than a second threshold pressure, and wherein the first threshold pressure is greater than the second threshold pressure. ### Claim 5 (depends on 4) The apparatus of claim 4, wherein the one or more processors are further programmed to control the compressor and the vacuum pump, wherein controlling the compressor and vacuum pump includes: engaging the compressor to remove refrigerant from the vehicle during the first phase and the second phase of the recovery process; engaging the vacuum pump, in response to the first pressure in the apparatus, as measured by at least one of the one or more pressure sensitive devices, being less than the first threshold pressure, to assist the compressor; and disengaging the vacuum pump, in response to the second pressure in the apparatus, as measured by at least one of the one or more pressure sensitive devices, being less than the second threshold pressure, to cease assisting the compressor. ### Claim 6 (depends on 1) The apparatus of claim 1, further comprising: wherein the one or more processors are further programmed to control the compressor and the vacuum pump, wherein controlling the compressor and vacuum pump includes: engaging the compressor to remove refrigerant from the vehicle during the first phase and the second phase of the recovery process; engaging the vacuum pump to assist the compressor during the second phase of the recovery process; and disengaging the vacuum pump to cease assisting the compressor. ### Claim 7 (depends on 1) The apparatus of claim 1, further comprising: at least one component for refilling a vehicle air conditioning system with the refrigerant stored in the storage tank. ### Claim 8 (depends on 7) The apparatus of claim 7, further comprising: at least one from among the following for refilling the vehicle air conditioning system: a check valve, an electronic control valve, a filter, or a pressure transducer. ### Claim 9 (depends on 1) The apparatus of claim 1, wherein the one or more status lights include the first status light, a second status light, and a third status light, wherein the one or more processors are configured to illuminate the second status light in response to determining a status of the apparatus is an in-progress status, and wherein the one or more processors are configured to illuminate the third status light in response to determining a status of the apparatus is a user input required status. ### Claim 10 (depends on 1) The apparatus of claim 1, wherein the one or more status lights comprise at least two different colored lights, wherein the at least two different colored lights include a first colored light and a second colored light, and wherein both of the first colored light and the second colored light emit different colored light. ### Claim 11 (depends on 1) The apparatus of claim 1, wherein the one or more processors are programmed to determine a second status of the apparatus and to illuminate at least one of the one or more status lights by repeatedly flashing on and off. ### Claim 12 A method for indicating status of an apparatus configured to service vehicular air conditioning systems, the apparatus comprising a compressor, a condenser, and a storage tank, the method comprising: removing, using the compressor, refrigerant from a vehicle during both a first phase of removing refrigerant from the vehicle and a second phase of removing refrigerant from the vehicle; assisting, by a vacuum pump, the compressor in removing refrigerant from the vehicle during the second phase of removing refrigerant from the vehicle, wherein the vacuum pump is fluidly connected in series with the compressor during the second phase of removing refrigerant from the vehicle; stopping, by one or more processors of the apparatus, the vacuum pump from assisting the compressor in removing refrigerant from the vehicle by disengaging the vacuum pump and afterwards illuminating, by the one or more processors, at least a first status light of one or more status lights to indicate a ready status of a recovery process that includes both the first phase of removing refrigerant from the vehicle and the second phase of removing refrigerant from the vehicle; closing, by the one or more processors, a first switch, wherein the one or more processors are configured to close the first switch to divert the refrigerant from the vehicle around the vacuum pump during the first phase of removing refrigerant from the vehicle and opening, by the one or more processors, the first switch, wherein the one or more processors are configured to open the first switch during the second phase of removing refrigerant from the vehicle to permit the refrigerant from the vehicle to flow to the vacuum pump; and opening, by the one or more processors, a second switch, wherein the one or more processors are configured to open the second switch during the first phase of removing refrigerant from the vehicle to divert the refrigerant from the vehicle around the vacuum pump and closing, by the one or more processors, the second switch, wherein the one or more processors are configured to close the second switch during the second phase of removing refrigerant from the vehicle, wherein the first switch includes a first valve and a first solenoid, and the second switch includes a second valve and a second solenoid, or wherein the first switch and the second switch are configured as a single three-way valve, and wherein the first status light is visible from 360 degrees around the apparatus in a respective horizontal plane projected outward from the first status light. ### Claim 13 (depends on 12) The method of claim 12, further comprising: determining, by the one or more processors, a second status of the apparatus, wherein the second status is an in progress status of the recovery process, illuminating, by the one or more processors, at least a second status light of the one or more status lights to represent the second status of the apparatus, wherein the second status light is visible from 360 degrees around the apparatus in a respective horizontal plane projected outward from the second status light. ### Claim 14 (depends on 13) The method of claim 13, further comprising: engaging, by the one or more processors, the compressor to remove refrigerant from the vehicle during the first phase removing refrigerant from the vehicle. ### Claim 15 (depends on 13) The method of claim 13, further comprising: determining a second status of the apparatus; and illuminating a second status light of the one or more status lights, wherein the second status comprises an in-progress status. ### Claim 16 (depends on 15) The method of claim 15, further comprising: determining a third status of the recovery process; and illuminating a third status light of the one or more status lights, and wherein the third status comprises a user input required status. ### Claim 17 (depends on 12) The method of claim 12, wherein the one or more status lights comprise at least two different colored lights, wherein the at least two different colored lights include a first colored light and a second colored light, and wherein both of the first colored light and the second colored light emit different colored light. ### Claim 18 A non-transitory computer-readable medium having stored thereon instructions executable by one or more processors to control an apparatus configured to recover refrigerant from a vehicle to perform functions comprising: removing, using a compressor, refrigerant from a vehicle during both a first phase of removing refrigerant from the vehicle and a second phase of removing refrigerant from the vehicle; assisting, by a vacuum pump, the compressor in removing refrigerant from the vehicle during the second phase of removing refrigerant from the vehicle, wherein the vacuum pump is fluidly connected in series with the compressor during the second phase of removing refrigerant from the vehicle; and stopping the vacuum pump from assisting the compressor in removing refrigerant from the vehicle by disengaging the vacuum pump and afterwards illuminating at least a first status light of one or more status lights to indicate a ready status of a recovery process that includes both the first phase of removing refrigerant from the vehicle and the second phase of removing refrigerant from the vehicle; closing, by the one or more processors, a first switch, wherein the one or more processors executing the instructions are configured to close the first switch to divert the refrigerant from the vehicle around the vacuum pump during the first phase of removing refrigerant from the vehicle and opening, by the one or more processors, the first switch, wherein the one or more processors executing the instructions are configured to open the first switch during the second phase of removing refrigerant from the vehicle to permit the refrigerant from the vehicle to flow to the vacuum pump; and opening, by the one or more processors, a second switch, wherein the one or more processors executing the instructions are configured to open the second switch during the first phase of removing refrigerant from the vehicle to divert the refrigerant from the vehicle around the vacuum pump and closing, by the one or more processors, the second switch, wherein the one or more processors executing the instructions are configured to close the second switch during the second phase of removing refrigerant from the vehicle, wherein the first switch includes a first valve and a first solenoid, and the second switch includes a second valve and a second solenoid, or wherein the first switch and the second switch are configured as a single three-way valve, and wherein the first status light is visible from 360 degrees around the apparatus in a respective horizontal plane projected outward from the first status light. ### Claim 19 (depends on 18) The non-transitory computer-readable medium of claim 18, wherein the functions further comprise: determining a second status of the apparatus; and illuminating a second status light of the one or more status lights, wherein the second status comprises an in-progress status. ### Claim 20 (depends on 19) The non-transitory computer-readable medium of claim 19, wherein the functions further comprise: determining a third status of the recovery process; and illuminating a third status light of the one or more status lights, and wherein the third status comprises a user input required status. ### Claim 21 (depends on 1) The apparatus of claim 1, wherein the one or more status lights include the first status light and a second status light, and wherein the first status light is above the second status light. ### Claim 22 (depends on 1) The apparatus of claim 1, further comprising: one or more pressure transducer, switch or gauge, each configured to measure a first pressure and/or a second pressure in the apparatus, wherein the vacuum pump begins assisting in response to the first pressure in the apparatus, as measured by at least one of the one or more pressure transducer, switch or gauge, being less than a first threshold pressure, wherein the vacuum pump ceases assisting in response to the second pressure in the apparatus, as measured by at least one of the one or more pressure transducer, switch or gauge, being less than a second threshold pressure, and wherein the first threshold pressure is greater than the second threshold pressure. ### Claim 23 (depends on 22) The apparatus of claim 22, wherein the one or more processors are further programmed to control the compressor and the vacuum pump, wherein controlling the compressor and vacuum pump includes: engaging the compressor to remove refrigerant from the vehicle during the first phase and the second phase of the recovery process; engaging the vacuum pump, in response to the first pressure in the apparatus, as measured by at least one of the one or more pressure transducer, switch or gauge, being less than the first threshold pressure, to assist the compressor; and disengaging the vacuum pump, in response to the second pressure in the apparatus, as measured by at least one of the one or more pressure transducer, switch or gauge, being less than the second threshold pressure, to cease assisting the compressor. ### Claim 24 (depends on 1) An apparatus according to claim 1, wherein the one or more status lights includes one status light that changes color based on a status of the apparatus. ### Claim 25 (depends on 12) A method according to claim 12, wherein the first status light includes one status light that changes color based on the status of the apparatus. ### Claim 26 (depends on 18) A non-transitory computer-readable medium according to claim 18, wherein the first status light includes one status light that changes color based on a status of the apparatus.