# Refrigerant Compressor: Building Code Definition > How the IRC 2009 define refrigerant compressor, where the wording differs, and which chapters depend on the term. - Canonical: https://harth.build/resources/glossary/refrigerant-compressor/ - Last updated: 2026-09-07 - Data source: Definitions quoted from the 2009 International Codes as transcribed in this site's building-codes collection, with the source chapter linked for each quotation. Usage counts are computed over the chapters hosted here, one copy per code. The [ICC code library](https://codes.iccsafe.org/codes) publishes the current model text and the [ICC adoption maps](https://www.iccsafe.org/advocacy/code-adoption-maps/) show which edition a jurisdiction has adopted; those sources control. ## Key facts | Fact | Value | | --- | --- | | Defined in | IRC 2009 (2009 editions transcribed in this corpus) | | Primary source | IRC 2009 Definitions (model text, not a jurisdiction's adopted text) | | Chapters using the term | 3 (counted across the codes hosted here) | | Wording identical across codes | Single code (compare before citing one code's wording under another) | ## Direct answer Refrigerant compressor is a defined term in the International Residential Code (IRC) 2009, in Definitions. The code's own words are: “A specific machine, with or without accessories, for compressing a given refrigerant vapor.” No other I-Code in this corpus defines it, so the IRC 2009 definition is the one to work from. The term is used in 3 chapters of this corpus, most often in Building Services and Systems (IFC 2009), Definitions (IMC 2009), Definitions (IRC 2009). These pages transcribe the 2009 model text; verify the definition against the edition and amendments your authority having jurisdiction has adopted. Record the jurisdiction, the adopted edition, the application date and any local amendment that rewrites the definition before you use it on a live project, because a term redefined by amendment changes every requirement that depends on it. *Content and cited inputs reviewed by [Scott Barrington](https://nz.linkedin.com/in/barrington), Harth founder and architectural technology specialist · Published 2026-09-07 · Updated 2026-09-07.* ## What does this term mean? **Refrigerant Compressor** — IRC 2009, Definitions: > A specific machine, with or without accessories, for compressing a given refrigerant vapor. ![Labeled code-term definition diagram: Refrigerant Compressor: Building Code Definition](https://efwwel0vyt9vy5so.public.blob.vercel-storage.com/images/glossary/refrigerant-compressor/diagram-1344.webp) *How the IRC 2009 define refrigerant compressor, where the wording differs, and which chapters depend on the term.* ## What must be verified before using this guidance? **Refrigerant Compressor** is defined once in this corpus, in the [Definitions](https://harth.build/resources/building-codes/us-states/maryland/irc-2009/definitions.md) chapter of the International Residential Code (IRC) 2009: > A specific machine, with or without accessories, for compressing a given refrigerant vapor. ## Where refrigerant compressor is used in the code The term appears in 3 chapters of the 2009 I-Codes hosted here. The chapters that lean on it hardest are the ones to read next. | Chapter | Code | Mentions | | --- | --- | --- | | [Building Services and Systems](https://harth.build/resources/building-codes/us-states/rhode-island/ifc-2009/building-services-and-systems.md) | IFC 2009 | 2 | | [Definitions](https://harth.build/resources/building-codes/us-states/new-hampshire/imc-2009/definitions.md) | IMC 2009 | 1 | | [Definitions](https://harth.build/resources/building-codes/us-states/maryland/irc-2009/definitions.md) | IRC 2009 | 1 | ## Refrigerant Compressor compared with Compressor These two are the closest pair in the 2009 I-Codes: about 69 per cent of their defining words are the same. The code states both and compares neither, so the difference is worth naming. | | Wording unique to it | | --- | --- | | **Refrigerant Compressor** (IRC 2009) | given, refrigerant, vapor | | [Compressor](https://harth.build/resources/glossary/compressor.md) (IMC 2009) | gas | Everything else in the two definitions is shared. If a project turns on which of the two applies, those words are the whole of the test — and a local amendment that edits one of them without editing the other moves the boundary between refrigerant compressor and compressor. ## The terms refrigerant compressor is built out of The definition above leans on 1 other defined term. Each carries its own code definition, and a local amendment to any of them changes what refrigerant compressor covers: - **[Refrigerant](https://harth.build/resources/glossary/refrigerant.md)** — IRC 2009: A substance used to produce refrigeration by its expansion or evaporation. ## Refrigerant Compressor: what to open, and in what order Every row is a document this term depends on. The [ICC code library](https://codes.iccsafe.org/codes) and the [ICC adoption maps](https://www.iccsafe.org/advocacy/code-adoption-maps/) cover the middle rows. | Check | Where | Confirmed | | --- | --- | --- | | Read the definition in the adopted IRC | Definitions | | | Re-check the requirement that uses it | Building Services and Systems (IFC 2009) | | | Re-check the requirement that uses it | Definitions (IMC 2009) | | | Re-check the requirement that uses it | Definitions (IRC 2009) | | | Confirm the dependent definition | Refrigerant | | | Local amendment to any of the above | Jurisdiction's amendment list | | **A research aid, not a code determination.** The authority having jurisdiction decides which edition and which amendments apply. ## Where can you explore related guidance? - [Explore all glossary guidance](https://harth.build/resources/glossary.md) - [Refrigerant: Building Code Definition](https://harth.build/resources/glossary/refrigerant.md) - [Building: Building Code Definition](https://harth.build/resources/glossary/building.md) - [Construction Documents: Building Code Definition](https://harth.build/resources/glossary/construction-documents.md) - [Registered Design Professional: Building Code Definition](https://harth.build/resources/glossary/registered-design-professional.md) ## Sources and method Definitions quoted from the 2009 International Codes as transcribed in this site's building-codes collection, with the source chapter linked for each quotation. Usage counts are computed over the chapters hosted here, one copy per code. The [ICC code library](https://codes.iccsafe.org/codes) publishes the current model text and the [ICC adoption maps](https://www.iccsafe.org/advocacy/code-adoption-maps/) show which edition a jurisdiction has adopted; those sources control. ### Source links - [codes.iccsafe.org](https://codes.iccsafe.org/codes) - [iccsafe.org](https://www.iccsafe.org/advocacy/code-adoption-maps/) ## Frequently asked questions ### What is the code definition of refrigerant compressor? The International Residential Code (IRC) 2009 defines it in Definitions as: “A specific machine, with or without accessories, for compressing a given refrigerant vapor.” The 2009 model text is reproduced here; the definition that binds your project is the one in the edition your jurisdiction has adopted, as amended locally. ### Which parts of the code depend on refrigerant compressor? In this corpus the term is used across 3 chapters, led by Building Services and Systems in the IFC 2009. Those are the sections whose scope moves if the definition is amended locally, so read them together with Chapter 2 rather than on their own. ### What is the ASME code for refrigeration piping? Piping is a separate defined term. The IRC 2009 defines it as: “Where used in this code, “piping” refers to either pipe or tubing, or both.” That is not the same as refrigerant compressor, which the IRC 2009 defines as “A specific machine, with or without accessories, for compressing a given refrigerant vapor.” — read both before applying either, and confirm the wording in the edition your jurisdiction has adopted. --- - Continue in Harth (open this topic in the Harth agent): https://app.harth.build/agent?context=%2Fresources%2Fglossary%2Frefrigerant-compressor%2F - View this page in a browser: https://harth.build/resources/glossary/refrigerant-compressor/ - All resources for agents: https://harth.build/llms.txt