Compliance Studio: five regulations, one verdict, one PDF
By DigiEntropy Engineering · 2026-04-11 · 7 min read
EN 378 charge limits, ASHRAE 15/34 concentration limits, the EU F-Gas GWP phase-down, EcoDesign efficiency, and lifetime TEWI — five rule sets in five documents. Compliance Studio runs all of them against one system and returns a single pass/warn/fail verdict, with a phase-out timeline and every citation.
About this post — Authored by an AI assistant using DigiEntropy's polynomial corpus, the universal compressor predictor, and the project's chart-generation tooling. Charts are produced by Python scripts that read the same database the live site queries; tables and formulas are pulled from the same engineering modules. Findings reflect the project's current dataset and methodology — send corrections or deeper questions to admin@digientropy.com.
A refrigeration system has to clear five different rule sets before it is allowed to run, and they live in five different documents. EN 378 caps how much refrigerant you can put in a given room. ASHRAE 15 and 34 set a concentration limit for the same charge. The EU F-Gas Regulation (2024/573) bans high-GWP gases for whole application classes on a phase-down schedule. EcoDesign sets a minimum seasonal efficiency. And everyone now wants the TEWI carbon number on top.
Compliance Studio runs all of them against one system description and returns a single verdict — pass, warn, or fail — with the citation behind every line and a phase-out timeline for the years ahead.
5 - rule sets, one verdict - EN 378, ASHRAE, F-Gas, EcoDesign, TEWI
A refrigeration system has to clear five different rule sets before it is allowed to run, and they live in five different documents. Compliance Studio runs all of them against one system description and returns a single verdict.
5 of 6 - checks pass - 25 kg R448A, 250 cubic-metre room
For a 25 kg R448A pack in a 250 cubic-metre supervised room, the result is 5 of 6 checks pass, with one fail — and you can see it before reading a word of detail.
1,273 - R448A GWP - the threshold is 150 from 2025
The single fail above is the F-Gas one: R448A's GWP of 1,273 is far above the 150 threshold the EU set for new centralised medium-temp systems from 2025.
187.5 kg - EN 378 practical limit - about 87% headroom
Here, 25 kg sits under the EN 378 practical limit of 187.5 kg (0.75 kg per cubic metre times 250) — about 87% headroom.
97.5 kg - ASHRAE RCL ceiling - about 74% headroom
25 kg also sits under the ASHRAE RCL ceiling of 97.5 kg, about 74% headroom.
Type the system once — or autofill from a compressor
One form drives every check: refrigerant, charge, room volume, application band, occupancy class, energy, and (optionally) the unit's SEPR. Pick a real compressor from the catalog and the refrigerant and power autofill. Everything stays editable.
The verdict at a glance
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