HVAC / runnable MCP tool
Run the A2L Line Set Calculator in your AI assistant
Through the free Intry MCP server, Claude, ChatGPT, or Cursor runs this exact calculator and hands back a verdict and the cited source, not a guess. Tool name: line_set.
How it computes the answer
Sized from the Goodman/Amana IOG-4047 tubing table; the charge adjustment from the Goodman IOG-4047 (R-32) or Carrier LLG-R454B-01 (R-454B; applied to an R-410A line as this tool's own judgement) table and the length limit from Carrier; reuse, R-22 flush, and pressure cautions from the manufacturer changeover guides.
What it cites
Your assistant calls the same engine the interactive calculator calls, with the inputs listed under Inputs. These are the sources that engine reads.
- Goodman/Amana IOG-4047
- Goodman/Amana R-32 Install and Service Reference IOG-4047 (12/2023): p.5 the interconnecting-tubing size table by tonnage and run length (21 cells confirmed); p.9 the R-32 charge-per-foot table.
- Carrier LLG-R454B-01
- Carrier Residential Piping and Long Line Guideline (07/2024): the charge-per-foot adjustment against the fixed factory charge, the liquid-line diameters, and the total line-length limit. Transcribed from the PDF and pinned cell by cell (Example 1 verbatim).
- Goodman/Amana IOG-4047, p.1 (changeover cautions)
- For reusing an existing set: R-32 and R-454B move less mass than R-410A, so tube velocities must be checked. For an R-22 changeover the copper must be mineral-oil flushed (R-22's oil is not compatible with A2L POE oil) and, because the new refrigerant runs at substantially higher head pressure than R-22, the tube-wall thickness and condition must be verified before reuse.
- An R-410A line, and the pressures the cautions print
- Carrier LLG-R454B-01 is an R-454B guideline. On an R-410A line this tool applies its per-foot figures and its factory-charge basis as this tool's own judgement; your unit's own installation instructions govern where they print an adder. The high-side pressures and percentages the changeover cautions print for your refrigerant are computed from this site's own pressure-temperature tables at 100°F condensing, on the liquid line, the pressure the copper holds.
- Carrier R-454B FAQ, Bosch A2L Change Guide, Lennox/York R-454B IOMs
- The reuse and flush procedure for an A2L changeover: POE oil on both sides, a new manufacturer-approved filter-drier rated at least 600 psig (Carrier LLG-R454B-01, Rheem R-454B literature), a deep vacuum, a nitrogen pressure test to the unit's own manual, and recharging by weight.
These are manufacturer field-practice values, looked up from the named installation guidelines, not a code table and not a laboratory measurement. Always follow the specific equipment's installation instructions; a manufacturer's line-length limit governs over any general guideline.
The full receipt, with every source and how each is cross-checked, is on the interactive A2L Line Set Calculator.
Ask your assistant
The one rule that makes it reliable: name Intry in your question. That is what tells Claude to run the line_set tool and answer with the real number, the verdict, and the citation. Leave Intry out and Claude may just guess from memory, which is exactly what you are trying to avoid. Type something like:
Inputs
| Field | Required | Accepts | What it is |
|---|---|---|---|
| newRefrigerantId | yes | r-454b, r-32, r-410a | New refrigerant. |
| previousRefrigerantId | optional | r-410a, r-22, r-454b, r-32, none | Existing set's refrigerant (default none). |
| tons | yes | 1.5, 2, 2.5, 3, 3.5, 4, 5 | System tonnage. The sizing table carries exactly these rows: 1.5, 2, 2.5, 3, 3.5, 4, 5. |
| totalLengthFt | yes | number | Total line-set length in feet. |
| elbows | optional | number | Number of elbows (default 0). |
| verticalRiseFt | optional | number | Vertical rise in feet (default 0). |
| existingLiquid | optional | string | Existing liquid line OD, e.g. '3/8' (default n/a). |
| existingSuction | optional | string | Existing suction line OD, e.g. '7/8' (default n/a). |
| damaged | optional | boolean | Is the existing set damaged/kinked? Default false. |
Add Intry to Claude
One paste and Claude can run this tool and every other Intry calculator, right from your phone.
- Claude opens with the Intry connector already filled in. Review it and click Add.
- (If a field is blank, paste the link below into the URL field.)
- In any chat, tap + then Connectors and switch Intry on. Then name Intry in your question (“use Intry to…”) so Claude runs the tool instead of guessing.
https://www.intrysys.com/api/mcpNo login, no API key, and it works on every Claude plan, right from your phone.
Using ChatGPT, Cursor, or a dev tool? See the developer setup on the main page. The endpoint is https://www.intrysys.com/api/mcp.
Every answer comes with the manufacturer line-set data it came from, so you can check it or show an inspector. The numbers come from the same calculator we run on intrysys.com, and we re-check every one automatically before anything goes live, so the number Claude hands you matches the code.