In shortR1233zd(E) is a non-flammable (A1), very low-GWP fluid that replaces R123 in low-pressure centrifugal chillers. Its ozone depletion potential is negligible.
R1233zd properties
| Code | R1233zd |
|---|---|
| Chemical name / composition | trans-1-Chloro-3,3,3-trifluoropropene (R1233zd(E)) |
| Family | HCFO |
| GWP (AR4, 100 years) | 1 |
| ODP | 0.0003 |
| Safety class (ISO 817 / ASHRAE 34) | A1: lower toxicity, non-flammable |
| Boiling point (1 atm) | 18.3 °C |
| Temperature glide | None (pure fluid) |
| Charge equal to 5 t CO₂e | — |
| Status | Next generation |
Where is R1233zd used?
- Low-pressure centrifugal chillers
- High-temperature heat pumps
- Organic Rankine cycle (ORC)
Service and safety notes
- Non-flammable and low toxicity (A1). A large leak in a closed room can still displace oxygen, so gas detection is recommended in small plant rooms.
- Never charge a system with a refrigerant other than the one on its nameplate; retrofits need manufacturer approval and oil and component checks.
- Charging, recovery and leak checks must be done and recorded by F-gas certified technicians.
R1233zd and regulations
Its very low GWP means F-gas restrictions practically do not apply. Safety rules for flammability, toxicity and pressure (EN 378 and related standards) still apply to system design, room size and charge.
Alternatives to R1233zd
Compare all refrigerants in our refrigerant guide.
Other refrigerants
R12R502R22R123R134aR404AR407CR407FR410AR417AR422DR507AR32R448AR449AR452AR454BR454CR513AR1234yfR1234zeR514AR290R600aR1270R744R717
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Frequently asked questions
What is the GWP of R1233zd?
The 100-year global warming potential (AR4) of R1233zd is about 1.
Is R1233zd flammable?
A1: lower toxicity, non-flammable.
What can replace R1233zd?
Depending on the application: R514A, R1234ze. Conversions require manufacturer approval and oil and component checks.