{
  "ok": true,
  "engineVersion": "1.1.0",
  "input": {
    "mode": "car",
    "state": "running",
    "refrigerant": "r134a",
    "ambientF": 85,
    "lowPressurePsig": null,
    "highPressurePsig": null,
    "elevationFt": 0,
    "atmosphericPressurePsia": 14.6959,
    "gaugeAdjustmentPsig": 0,
    "requestedUnits": {
      "temperature": "F",
      "pressure": "psig",
      "elevation": "ft"
    }
  },
  "refrigerant": {
    "id": "r134a",
    "name": "R-134a",
    "family": "HFC",
    "safetyClass": "A1",
    "a2l": false,
    "glideF": 0,
    "note": "Common legacy mobile-A/C refrigerant. Vehicle service data remains authoritative."
  },
  "reference": {
    "available": true,
    "refrigerant": "r134a",
    "ambientF": 85,
    "low": {
      "minPsig": 45,
      "maxPsig": 55
    },
    "high": {
      "minPsig": 225,
      "maxPsig": 250
    },
    "supportedAmbientF": {
      "min": 65,
      "max": 105
    },
    "method": "Linear interpolation between reviewed generic running-pressure chart points.",
    "source": {
      "name": "Mastercool R-134a / R-1234yf manifold gauge reference chart",
      "url": "https://mastercool.com/product/r1234yf-r134a-brass-manifold-gauge-set-copy/",
      "note": "Generic running-pressure reference only. The source itself directs users to vehicle-manufacturer information for exact specifications."
    },
    "dataVersion": "2026.08.06-mastercool-reference"
  },
  "measured": {
    "low": {
      "pressurePsig": null,
      "status": "not-entered",
      "saturation": null
    },
    "high": {
      "pressurePsig": null,
      "status": "not-entered",
      "saturation": null
    }
  },
  "thermal": {
    "superheat": null,
    "subcooling": null,
    "targets": {
      "superheat": null,
      "subcooling": null
    },
    "elevation": {
      "feet": 0,
      "atmosphericPressurePsia": 14.6959,
      "gaugeAdjustmentPsig": 0
    },
    "note": null
  },
  "diagnosis": {
    "code": "reference-only",
    "severity": "reference",
    "title": "Generic reference ready",
    "summary": "Enter one or both gauge readings to compare them with the reference envelope.",
    "checks": [
      "Use the correct test state and refrigerant.",
      "Measure ambient at the equipment/vehicle under the specified procedure."
    ]
  },
  "display": {
    "units": {
      "temperature": "°F",
      "pressure": "psig",
      "elevation": "ft"
    },
    "ambient": {
      "value": 85,
      "unit": "°F"
    },
    "elevation": {
      "value": 0,
      "unit": "ft",
      "feet": 0,
      "atmosphericPressure": {
        "value": 14.7,
        "unit": "psia"
      },
      "gaugeAdjustment": {
        "value": 0,
        "unit": "psig"
      }
    },
    "reference": {
      "low": {
        "min": 45,
        "max": 55,
        "unit": "psig"
      },
      "high": {
        "min": 225,
        "max": 250,
        "unit": "psig"
      }
    },
    "measured": {
      "low": null,
      "high": null
    },
    "thermal": {
      "superheat": null,
      "subcooling": null,
      "targets": {
        "superheat": null,
        "subcooling": null
      }
    }
  },
  "warnings": [
    "Generic reference only—manufacturer service data and specified test conditions are authoritative.",
    "Gauge pressures alone cannot confirm refrigerant charge or identify one failed component.",
    "Refrigerant can cause frostbite, high pressure can injure, and running equipment includes hot and moving parts. Use qualified service practices and never vent refrigerant."
  ],
  "testConditions": [
    "Use the vehicle manufacturer's specified performance-test procedure whenever available.",
    "Measure outside air in the shade near the condenser inlet, not over hot pavement or engine heat.",
    "Let the system stabilize with the A/C commanded on and both service valves closed while reading gauges.",
    "Engine speed, fan setting, humidity, compressor design, condenser airflow, and vehicle load can materially change readings.",
    "A generic pressure band cannot confirm refrigerant charge or identify one failed component."
  ],
  "provenance": {
    "pt": {
      "name": "HVAC PT Charts / CoolProp 7.2.0",
      "url": "https://hvacptcharts.com/",
      "license": "CC BY 4.0",
      "licenseUrl": "https://creativecommons.org/licenses/by/4.0/",
      "note": "Repository tables retain reviewed 5°F checkpoints from the published 1°F saturation tables. Values between checkpoints are linearly interpolated.",
      "version": "2026.08.06-coolprop-7.2-5f",
      "reviewedAt": "2026-08-06"
    },
    "atmosphere": {
      "name": "NASA Glenn Earth Atmosphere Equation",
      "url": "https://www1.grc.nasa.gov/beginners-guide-to-aeronautics/earth-atmosphere-equation-english/",
      "model": "Lower-atmosphere pressure curve-fit form, normalized to 14.6959488 psia at 0 ft.",
      "supportedElevationFt": {
        "min": -1000,
        "max": 15000
      },
      "reviewedAt": "2026-08-08"
    },
    "automotive": {
      "name": "Mastercool R-134a / R-1234yf manifold gauge reference chart",
      "url": "https://mastercool.com/product/r1234yf-r134a-brass-manifold-gauge-set-copy/",
      "note": "Generic running-pressure reference only. The source itself directs users to vehicle-manufacturer information for exact specifications.",
      "version": "2026.08.06-mastercool-reference",
      "reviewedAt": "2026-08-06"
    }
  }
}