# Refrigeration System: Building Code Definition

> How the IFC 2009 define refrigeration system, where the wording differs, and which chapters depend on the term.

- Canonical: https://harth.build/resources/glossary/refrigeration-system/
- 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 | IFC 2009 (2009 editions transcribed in this corpus) |
| Primary source | IFC 2009 Building Services and Systems (model text, not a jurisdiction's adopted text) |
| Chapters using the term | 17 (counted across the codes hosted here) |
| Wording identical across codes | Single code (compare before citing one code's wording under another) |

## Direct answer

Refrigeration system is a defined term in the International Fire Code (IFC) 2009, in Building Services and Systems. The code's own words are: “A combination of interconnected refrigerant-containing parts constituting one closed refrigerant circuit in which a refrigerant is circulated for the purpose of extracting heat.” No other I-Code in this corpus defines it, so the IFC 2009 definition is the one to work from. The term is used in 17 chapters of this corpus, most often in Refrigeration (IMC 2009), Building Services and Systems (IFC 2009), Definitions (IMC 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?

**Refrigeration System** — IFC 2009, Building Services and Systems:

> A combination of interconnected refrigerant-containing parts constituting one closed refrigerant circuit in which a refrigerant is circulated for the purpose of extracting heat.

![Labeled code-term definition diagram: Refrigeration System: Building Code Definition](https://efwwel0vyt9vy5so.public.blob.vercel-storage.com/images/glossary/refrigeration-system/diagram-1344.webp)

*How the IFC 2009 define refrigeration system, where the wording differs, and which chapters depend on the term.*

## What must be verified before using this guidance?

**Refrigeration System** is defined once in this corpus, in the [Building Services and Systems](https://harth.build/resources/building-codes/us-states/rhode-island/ifc-2009/building-services-and-systems.md) chapter of the International Fire Code (IFC) 2009:

> A combination of interconnected refrigerant-containing parts constituting one closed refrigerant circuit in which a refrigerant is circulated for the purpose of extracting heat.

## Where refrigeration system is used in the code

The term appears in 17 chapters of the 2009 I-Codes hosted here. The chapters that lean on it hardest are the ones to read next.

| Chapter | Code | Mentions |
| --- | --- | --- |
| [Refrigeration](https://harth.build/resources/building-codes/us-states/new-hampshire/imc-2009/refrigeration.md) | IMC 2009 | 30 |
| [Building Services and Systems](https://harth.build/resources/building-codes/us-states/rhode-island/ifc-2009/building-services-and-systems.md) | IFC 2009 | 20 |
| [Definitions](https://harth.build/resources/building-codes/us-states/new-hampshire/imc-2009/definitions.md) | IMC 2009 | 12 |
| [Scope and Administration](https://harth.build/resources/building-codes/us-states/maryland/ibc-2009/scope-and-administration.md) | IBC 2009 | 4 |
| [Definitions](https://harth.build/resources/building-codes/us-states/rhode-island/ifc-2009/definitions.md) | IFC 2009 | 3 |
| [Use and Occupancy Classification](https://harth.build/resources/building-codes/us-states/maryland/ibc-2009/use-and-occupancy-classification.md) | IBC 2009 | 2 |
| [Compressed Gases](https://harth.build/resources/building-codes/us-states/rhode-island/ifc-2009/compressed-gases.md) | IFC 2009 | 2 |
| [Corrosive Materials](https://harth.build/resources/building-codes/us-states/rhode-island/ifc-2009/corrosive-materials.md) | IFC 2009 | 2 |
| [Cryogenic Fluids](https://harth.build/resources/building-codes/us-states/rhode-island/ifc-2009/cryogenic-fluids.md) | IFC 2009 | 2 |
| [Fire Protection Systems](https://harth.build/resources/building-codes/us-states/rhode-island/ifc-2009/fire-protection-systems.md) | IFC 2009 | 2 |
| [Flammable Gases and Flammable Cryogenic Fluids](https://harth.build/resources/building-codes/us-states/rhode-island/ifc-2009/flammable-gases-and-flammable-cryogenic-fluids.md) | IFC 2009 | 2 |
| [Hazardous Materials-general Provisions](https://harth.build/resources/building-codes/us-states/rhode-island/ifc-2009/hazardous-materials-general-provisions.md) | IFC 2009 | 2 |

_5 further chapters mention the term._

### The term in use

How the code actually writes about refrigeration system, quoted from the 2009 text hosted here:

> Permanently installed refrigerant storage systems and other components shall be considered as part of the refrigeration system to which they are attached.

— [IMC 2009 §1101.1](https://harth.build/resources/building-codes/us-states/new-hampshire/imc-2009/refrigeration.md)

> Each high- and intermediate-pressure zone in a refrigeration system shall be provided with a single automatic valve providing a crossover connection to a lower pressure zone.

— [IFC 2009 §606.10.1](https://harth.build/resources/building-codes/us-states/rhode-island/ifc-2009/building-services-and-systems.md)

> Refrigeration system machinery rooms shall be provided with a refrigerant detector in accordance with Section 606.8.

— [IFC 2009 §908.6](https://harth.build/resources/building-codes/us-states/rhode-island/ifc-2009/fire-protection-systems.md)


## Refrigeration System compared with Refrigeration System, Mechanical

These two are the closest pair in the 2009 I-Codes: about 77 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 |
| --- | --- |
| **Refrigeration System** (IFC 2009) | — no wording of its own |
| [Refrigeration System, Mechanical](https://harth.build/resources/glossary/refrigeration-system-mechanical.md) (IMC 2009) | refrigeration, compressor, used, compressing, vapor |

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 refrigeration system and refrigeration system, mechanical.

## The terms refrigeration system 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 refrigeration system covers:

- **[Refrigerant](https://harth.build/resources/glossary/refrigerant.md)** — IRC 2009: A substance used to produce refrigeration by its expansion or evaporation.

## Refrigeration System: 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 IFC | Building Services and Systems | |
| Re-check the requirement that uses it | Refrigeration (IMC 2009) | |
| 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 | Scope and Administration (IBC 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)
- [Hood: Building Code Definition](https://harth.build/resources/glossary/hood.md)
- [Commercial Cooking Appliances: Building Code Definition](https://harth.build/resources/glossary/commercial-cooking-appliances.md)
- [Fire Code Official: Building Code Definition](https://harth.build/resources/glossary/fire-code-official.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 refrigeration system?

The International Fire Code (IFC) 2009 defines it in Building Services and Systems as: “A combination of interconnected refrigerant-containing parts constituting one closed refrigerant circuit in which a refrigerant is circulated for the purpose of extracting heat.” 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 refrigeration system?

In this corpus the term is used across 17 chapters, led by Refrigeration in the IMC 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 are the 7 components of a refrigeration system?

In the 2009 I-Codes hosted here it is a defined term rather than a description. The IFC 2009 states, in Building Services and Systems: “A combination of interconnected refrigerant-containing parts constituting one closed refrigerant circuit in which a refrigerant is circulated for the purpose of extracting heat.” It is defined in IFC 2009. Because it is a defined term, whatever the adopted edition says it means is what every section using it means — so check Chapter 2 of that edition and any local amendment before relying on this wording.

### 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 refrigeration system, which the IFC 2009 defines as “A combination of interconnected refrigerant-containing parts constituting one closed refrigerant circuit in which a refrigerant is circulated for the purpose of extracting heat.” — read both before applying either, and confirm the wording in the edition your jurisdiction has adopted.

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