PT Chart

Saturation pressure (bubble and dew, in psig) for a refrigerant at a temperature in Fahrenheit. For certified HVAC technicians (EPA 608; A2L certification where required). Example: pt_lookup("R-454B", 45). Bubble point: use for subcooling calculations. Dew point: use for superheat calculations. Pure fluids (R-32, R-410A, R-22, R-134a) have no glide, so both values match.

{
  "type": "object",
  "properties": {
    "refrigerant": {
      "title": "Refrigerant",
      "type": "string"
    },
    "temp_f": {
      "title": "Temp F",
      "type": "number"
    }
  },
  "required": [
    "refrigerant",
    "temp_f"
  ],
  "title": "pt_lookupArguments"
}

Saturation temperature (bubble and dew, in Fahrenheit) for a refrigerant at a pressure in psig. For certified HVAC technicians (EPA 608; A2L certification where required). Example: a 130 psig suction reading on R-454B -- pt_reverse("R-454B", 130). Use the DEW temperature for superheat work and the BUBBLE temperature for subcooling work on blended refrigerants.

{
  "type": "object",
  "properties": {
    "refrigerant": {
      "title": "Refrigerant",
      "type": "string"
    },
    "pressure_psig": {
      "title": "Pressure Psig",
      "type": "number"
    }
  },
  "required": [
    "refrigerant",
    "pressure_psig"
  ],
  "title": "pt_reverseArguments"
}

Superheat in Fahrenheit from suction pressure (psig) and suction-line temperature (F). For certified HVAC technicians (EPA 608; A2L certification where required). Uses the DEW point as the saturation basis, which is the correct basis for blended refrigerants. Typical TXV target: 8-12F.

{
  "type": "object",
  "properties": {
    "refrigerant": {
      "title": "Refrigerant",
      "type": "string"
    },
    "suction_psig": {
      "title": "Suction Psig",
      "type": "number"
    },
    "suction_line_f": {
      "title": "Suction Line F",
      "type": "number"
    }
  },
  "required": [
    "refrigerant",
    "suction_psig",
    "suction_line_f"
  ],
  "title": "superheatArguments"
}

Subcooling in Fahrenheit from head pressure (psig) and liquid-line temperature (F). For certified HVAC technicians (EPA 608; A2L certification where required). Uses the BUBBLE point as the saturation basis, which is the correct basis for blended refrigerants. Typical TXV target: 8-12F.

{
  "type": "object",
  "properties": {
    "refrigerant": {
      "title": "Refrigerant",
      "type": "string"
    },
    "head_psig": {
      "title": "Head Psig",
      "type": "number"
    },
    "liquid_line_f": {
      "title": "Liquid Line F",
      "type": "number"
    }
  },
  "required": [
    "refrigerant",
    "head_psig",
    "liquid_line_f"
  ],
  "title": "subcoolingArguments"
}

Convert between pressure units (psig, psia, kpa, bar) and temperature units (F, C). A bare 'psi' is treated as psig. For certified HVAC technicians (EPA 608; A2L certification where required).

{
  "type": "object",
  "properties": {
    "value": {
      "title": "Value",
      "type": "number"
    },
    "from_unit": {
      "title": "From Unit",
      "type": "string"
    },
    "to_unit": {
      "title": "To Unit",
      "type": "string"
    }
  },
  "required": [
    "value",
    "from_unit",
    "to_unit"
  ],
  "title": "convert_unitsArguments"
}

Reference card for a refrigerant: GWP, ASHRAE safety class, composition, typical oil, temperature glide, and handling notes. For certified HVAC technicians (EPA 608; A2L certification where required). Informational only.

{
  "type": "object",
  "properties": {
    "refrigerant": {
      "title": "Refrigerant",
      "type": "string"
    }
  },
  "required": [
    "refrigerant"
  ],
  "title": "refrigerant_infoArguments"
}

Conversational diagnostic copilot: give it field readings and get back computed superheat/subcooling plus a ranked 'check this first' list. For certified HVAC technicians (EPA 608; A2L certification where required). Informational only -- it suggests what to CHECK, never how to defeat a safety device, vent refrigerant, or work uncertified. metering: 'txv' (default) or 'fixed' for fixed-orifice/piston systems.

{
  "type": "object",
  "properties": {
    "refrigerant": {
      "title": "Refrigerant",
      "type": "string"
    },
    "suction_psig": {
      "title": "Suction Psig",
      "type": "number"
    },
    "suction_line_f": {
      "title": "Suction Line F",
      "type": "number"
    },
    "head_psig": {
      "title": "Head Psig",
      "type": "number"
    },
    "liquid_line_f": {
      "title": "Liquid Line F",
      "type": "number"
    },
    "ambient_f": {
      "title": "Ambient F",
      "type": "number"
    },
    "metering": {
      "default": "txv",
      "title": "Metering",
      "type": "string"
    }
  },
  "required": [
    "refrigerant",
    "suction_psig",
    "suction_line_f",
    "head_psig",
    "liquid_line_f",
    "ambient_f"
  ],
  "title": "diagnoseArguments"
}

About CoolBooked: the AI appointment-booking connector for HVAC shops. This is NOT a diagnostic tool -- call it when someone asks what CoolBooked is, how shop owners can try it, or how the free PT tools connect to paid bookings.

{
  "type": "object",
  "properties": {},
  "title": "coolbooked_infoArguments"
}