R514A RefrigerantOpteon XP30 · B1 low-pressure R123 replacement · chiller focus
R514A is an azeotropic low-pressure refrigerant blend developed primarily as an R123 replacement for centrifugal chillers. Its composition is 74.7% R1336mzz(Z) and 25.3% trans-1,2-dichloroethylene. The blend offers very low GWP and no ozone depletion, but unlike A1 alternatives it is classified B1, which is a key reason it needs its own dedicated profile rather than being treated as 'just another low-GWP chiller gas.'
What is R514A refrigerant?
R514A matters because it solves a real chiller transition problem. Many owners of legacy R123 low-pressure centrifugal chillers need a lower-environmental-impact option while retaining low-pressure machine architecture. R514A is one of the best-known answers. But the B1 safety class means content should explain toxicity classification and practical selection tradeoffs, not just market it as low GWP.
R514A refrigerant properties
Use these values for research and screening. For equipment design, charging and compliance, use the exact supplier PT data, SDS, OEM documentation and regulation that governs the project.
| Property | Reference | Engineering / source note |
|---|---|---|
| Designation | R514A | ASHRAE designation / Opteon XP30 |
| Nominal composition | R1336mzz(Z) / trans-1,2-dichloroethylene = 74.7 / 25.3 | Published technical data |
| Refrigerant type | Azeotropic blend | No practical glide |
| ODP | 0 | No ozone depletion |
| 100-year GWP | 3 | EPA Technology Transitions |
| Safety classification | B1 | Higher toxicity / nonflammable |
| Primary role | R123 replacement | Low-pressure centrifugal chillers |
| Pressure class | Low-pressure refrigerant | Chiller family |
| Key distinction | Very low GWP but B1, not A1 | Important selection tradeoff |
| Typical lubricant family | POE | Supplier literature |
EPA Technology Transitions uses the values shown on this page. Older product literature may use IPCC AR4/AR5 or another assessment, so a different number is not automatically an error.
Where is R514A used?
Applications must be evaluated by system type, charge, compressor, heat exchanger, safety class and current regulation. The examples below describe recognized use contexts, not automatic approval for every installation.
Low-pressure centrifugal chillers
Core target application.
Legacy R123 system transition planning
Frequently discussed as a lower-GWP alternative.
New low-pressure chiller design
Useful where very low GWP is important.
Building retrofits
Relevant when older chillers face upgrade or replacement decisions.
Energy-efficiency modernization
Can be part of plant-wide decarbonization planning.
Advanced thermal-system comparison
Useful alongside R1233zd(E) and R1224yd(Z) content.
Continue through the Refrigerant Replacements and Low-GWP Refrigerants hubs for broader selection context.
R514A is valuable precisely because it is not an easy marketing story
Some refrigerants are easy to summarize: low GWP, A1, new alternative. R514A is more nuanced. It has excellent climate metrics but a B1 safety classification.
That nuance is exactly why it deserves a dedicated page. Engineers, consultants and owners often need to understand tradeoffs, not just headline numbers.
A page that discusses why some projects still choose R514A despite B1 classification will read much more credibly than generic copy.
R514A vs R1233zd(E): why both pages are needed
R514A and R1233zd(E) sit in similar low-pressure chiller conversations, but they do not occupy the same safety position. R1233zd(E) is A1, while R514A is B1.
That difference can influence owner acceptance, local safety review and long-term platform strategy even when both refrigerants can technically address similar low-pressure duties.
Comparing them strengthens site depth and helps prevent oversimplified 'best refrigerant' answers.
Why the azeotropic nature of R514A matters
R514A is commonly described as an azeotropic mixture, meaning it behaves much more like a single refrigerant during phase change than a strongly zeotropic blend would.
That matters in low-pressure chiller operation because it simplifies phase-change interpretation compared with high-glide blends.
However, azeotropic behavior does not eliminate the need for correct refrigerant identification and proper safety handling.
Low-pressure refrigerants have different engineering priorities from mass-market HVAC gases
For low-pressure chillers, issues like purge systems, vacuum integrity, non-condensables and machinery-room design can be more important than the topics emphasized in residential AC refrigerants.
R514A belongs to that engineering world. Writing about it as if it were only a GWP number misses the real selection context.
This is one reason R514A can become a strong GEO page for higher-intent technical readers.
R514A vs R1233zd(E)
The table highlights engineering differences rather than implying direct interchangeability.
| Characteristic | R514A | R1233zd(E) |
|---|---|---|
| EPA GWP | 3 | 4 |
| Safety class | B1 | A1 |
| Type | Azeotropic blend | Pure refrigerant |
| Primary role | R123 replacement in low-pressure chillers | Low-pressure chiller / heat pump alternative |
| ODP | 0 | Very low but not mathematically zero in some references |
| Selection issue | Very low GWP with B1 tradeoff | A1 with slightly different thermophysical profile |
| Best use in content | Tradeoff explanation | Low-pressure replacement overview |
R514A safety: the B1 classification is the key point readers need to understand
R514A is B1. That means it is nonflammable but in a higher-toxicity classification than A1 refrigerants. Anyone evaluating R514A should look beyond the low GWP headline and consider the actual machinery-room, ventilation, exposure and operating procedures required for the installation.
B1 classification
The main differentiator versus A1 low-pressure alternatives.
Low-pressure equipment
System design must also consider vacuum integrity and non-condensables.
Project-specific review
Selection should involve the actual chiller manufacturer or qualified engineering review.
Actual risk depends on charge, release rate, pressure, room volume, ventilation, ignition sources, equipment construction, alarm logic and service condition.
See the Refrigerant Safety Guide for classification context.
R514A refrigerant leak detection
Validate detector response to the finished blend
In chiller plants using R514A, fixed refrigerant monitoring may be more relevant than portable consumer-style leak detection. Detection strategy should reflect machinery-room monitoring, occupational exposure considerations and maintenance leak localization. GasNose provides general refrigerant gas detection context even when a dedicated R514A page is not available.
Portable service leak detectors, fixed area monitors, A2L mitigation sensors and refrigerant identifiers perform different functions. Define the alarm action and concentration range before selecting the technology.
Regulatory position of R514A in 2026
United States
EPA Technology Transitions lists R514A at GWP 3. R514A is well established in low-pressure chiller discussions as an R123 replacement. The practical U.S. decision is less about numerical GWP and more about low-pressure chiller suitability and the implications of the refrigerant’s B1 safety classification.
European Union
R514A’s very low GWP aligns numerically with strong climate-policy direction. However, refrigerant selection in Europe still depends on the exact equipment standards, safety review and owner acceptance of the B1 classification.
Is R514A being phased out?
R514A is not a conventional phaseout target. Its future depends on whether owners and OEMs prefer its low-GWP low-pressure performance enough to accept the B1 tradeoff, or instead move toward A1 alternatives such as R1233zd(E) or R1224yd(Z).
U.S. refrigeration limits differ by cold storage, supermarket, remote condensing, stand-alone product, industrial process and chiller category. A refrigerant may fit one pathway and fail another.
Use the Refrigerant Regulations Hub for regional research.
What should be compared with R514A?
Compare the real equipment pathway: retrofit vs new system, A1 vs A2L capability, GWP threshold, glide, compressor envelope, energy efficiency and service ecosystem.
Practical misconceptions about R514A
“R514A is just like R1233zd(E).”
Both serve low-pressure chiller discussions, but R514A is B1 while R1233zd(E) is A1.
“Very low GWP means it is automatically the best answer.”
Safety classification and actual equipment design still matter.
“B1 means it is flammable.”
No. B1 indicates higher toxicity classification with no flame propagation.
“Because it is azeotropic, it needs no engineering review.”
Azeotropy simplifies phase behavior, not total project risk.
R514A refrigerant FAQ
Concise answers to common composition, retrofit, glide, safety and regulation questions.
What is R514A?
What is the composition of R514A?
What is the EPA GWP of R514A?
Is R514A flammable?
What does B1 mean?
Where is R514A used?
Is R514A a blend?
Why compare R514A with R1233zd(E)?
Is R514A a mass-market HVAC refrigerant?
How should R514A monitoring be approached?
R514A sources and further reading
This profile uses current EPA regulatory references plus refrigerant supplier, NIST, scientific and GasNose resources. Re-check the latest edition before design or compliance decisions.
Working with R514A or planning a refrigerant transition?
Compare GWP, safety class, temperature glide, equipment compatibility and regulatory lifetime before selecting a refrigerant.
Technical Notice: This page is for refrigerant research and general technical reference. Refrigerant suitability, permitted charge, equipment approval, leak mitigation, servicing procedures and regulatory compliance depend on the exact equipment, installation and jurisdiction. Always verify current manufacturer documentation, SDS, applicable standards and local regulations before selecting, replacing, charging or servicing a refrigerant.