Quick answer
R-717 is anhydrous ammonia used as a refrigerant. It is the classic refrigerant of large-capacity industrial refrigeration, and on climate grounds it is unbeatable. On safety grounds it is the most demanding refrigerant in ordinary use.
Ammonia is classified toxic if inhaled (H331) and it causes severe skin burns and serious eye damage (H314, H318). It is also a flammable gas (H221) and very toxic to aquatic life. Work on ammonia plant is carried out only by trained, certified personnel, on plant designed for this refrigerant, with adequate protective equipment including respiratory protection. It is not a refrigerant to improvise with, and it is a direct replacement for nothing.
From the point of view of Regulation (EU) 2024/573, its position is simple:
- What does not apply. The quota in Article 16(1), the leak checks in Article 5(1), the detection system in Article 6, the record in Article 7(1), the recovery duty in Article 8(1), the label in Article 12 and the purchase restriction in Article 11(6). All are written for fluorinated greenhouse gases.
- What does apply. Certification. Article 10(1) covers relevant alternatives, including natural refrigerants, and Implementing Regulation (EU) 2024/2215 creates Certificate C, exclusively for ammonia.
- Where it does appear in the text. In Annex VI, in the table of non-fluorinated substances used to calculate the GWP of mixtures: ammonia, R-717, NH3, GWP 0.
It contains no charge limits, no machinery room requirements, no ventilation rates, no detector alarm thresholds, no separation distances, no emergency plans and no numeric transport thresholds. Those come from the refrigerating-system safety standards, from occupational safety and major-accident legislation, from the plant design and from national rules. This page says where each one lives; it does not reproduce them.
Outside the F-gas regime — and why that matters in industrial refrigeration
The table below shows the scope of each provision as written, and where R-717 lands.
| Provision | Scope as written | R-717 |
|---|---|---|
| Article 16(1) — quota | Hydrofluorocarbons, as defined in Article 3, point (4) | Outside |
| Article 5(1) — leak checks | 5 tonnes CO2 equivalent of Annex I gases, or 1 kg of Annex II Section 1 gases | Outside |
| Article 6 — leakage detection system | Equipment with 500 tonnes CO2 equivalent or more of Annex I gases | Outside |
| Article 7(1) — equipment record | Equipment required to be checked under Article 5(1) | Outside |
| Article 8(1) — recovery | Operators of equipment containing fluorinated greenhouse gases | Outside |
| Article 12 — labelling | Products, equipment and containers with fluorinated greenhouse gases | Outside |
| Annex VI — GWP of mixtures | Non-fluorinated substances listed for the calculation | Listed: ammonia, R-717, GWP 0 |
| Article 10(1) — certification | Fluorinated gases or relevant alternatives, including natural refrigerants | Inside |
Why does this matter in industrial refrigeration? Because large process plant — cold stores, abattoirs, food industry, ice rinks — carries large charges. With a fluorinated gas, a large charge means a large CO2 equivalent, which puts you in the top band of Article 5(6): checks at least every 3 months, and a mandatory detection system under Article 6(1). With ammonia, that whole set of duties never triggers, because it is not an Annex I gas.
Leak detection no longer being imposed by Article 6 does not mean an ammonia machinery room goes without detection. Quite the opposite. Annex I to Implementing Regulation (EU) 2024/2215, heading 14, requires the certified person to know the safety requirements for service tools and equipment including gas detection, leak detection and personal protective equipment, especially gas masks, and to check on site that signs, emergency exits, gas sensors and gas alarms are in place. The duty changes its legal basis, not its content.
The regulatory pressure that pushed the market towards alternatives is unchanged as well: Article 13(3) prohibits, from 1 January 2025, using a fluorinated greenhouse gas with a GWP of 2 500 or more to service any refrigeration equipment, and Article 13(5) lowers the line to 750 from 1 January 2032 for stationary refrigeration, chillers excluded. See the ban timetable.
The hazard classification: what the safety data sheet says
In the ISO 817 and ANSI/ASHRAE 34 scheme, ammonia sits in B2L: the letter B for higher toxicity, 2L for mild flammability. The F-gas Regulation assigns no safety classes; they come from the refrigerant classification standards. The part you can verify directly is the CLP classification in the supplier's sheet.
| Item | Value from the safety data sheet |
|---|---|
| Physical hazards | Flammable gas, category 2, H221; gas under pressure, liquefied, H280 |
| Health hazards | Acute toxicity by inhalation, category 3, H331 — toxic if inhaled; skin corrosion 1B, H314; serious eye damage 1, H318 |
| Environmental hazards | Very toxic to aquatic life, category 1, H400; toxic with long lasting effects, category 2, H411; the label carries H410 |
| Signal word | Danger |
| Flammability limits | Lower 15.4 vol %; upper 33.6 vol % |
| Boiling point | −33 °C |
| Critical temperature | 132 °C |
| Vapour pressure at 20 °C | 8.57 bar |
| Acute toxicity, inhalation | LC50 rat, 4 h: 2 000 ppm |
| Odour | Pungent, suffocating; the sheet notes that the odour threshold is subjective and inadequate to warn of overexposure |
The occupational exposure limit values in the sheet, given as EU indicative values from Directives 91/322/EEC, 2000/39/EC and 2017/164/EU:
| Type | Value |
|---|---|
| Time-weighted average, 8 hours | 20 ppm (14 mg/m3) |
| Short-term | 50 ppm (36 mg/m3) |
Put those two tables side by side and you have the reason ammonia is handled differently from every other common refrigerant: the 8-hour exposure limit is 20 ppm, while the lower flammability limit is 15.4 % by volume, that is 154 000 ppm. Long before the atmosphere becomes flammable it is already dangerous to people. The dominant risk is toxicological, not fire.
The pungent smell is a warning, but not one to rely on: the sheet says expressly that the odour threshold is not adequate to warn of overexposure. Instrumental detection and respiratory protection are necessary, not optional.
Certificate C: what is examined for ammonia
Article 2(1), points (b) and (c), of Implementing Regulation (EU) 2024/2215 covers installation, repair, maintenance or servicing and decommissioning of the equipment listed in Article 1 containing fluorinated greenhouse gases or the alternative substances ammonia (NH3), carbon dioxide (CO2) or hydrocarbons. Article 2(2) extends the scope to legal persons working for third parties.
Article 3(2), point (d), creates Certificate C: holders may carry out all the activities provided for in Article 2(1) in relation to ammonia. It is a separate certificate — you do not reach it through A1, A2 or B.
Annex I, heading 14 — installation and good practice of servicing for equipment and systems relying on R717 (NH3) — shows what the examiner expects:
- Reading and understanding the piping and instrumentation diagrams of refrigeration systems with R717.
- Knowledge of the special requirements for refrigerant cylinders and gas extraction.
- Knowledge of the requirements for labelling of toxic refrigerants in systems and in pressure vessels.
- Knowledge of the safety requirements for service tools and equipment — recovery stations, vacuum pumps, electronic leak detectors — including gas detection, leak detection and personal protective equipment, especially gas masks.
- Knowledge of the rules of safe operation, including precautions against fires and explosions as well as injuries due to toxicity.
- Knowledge of the materials compatible with R717.
- Preparation of the work area and selection of appropriate tools, equipment and protective equipment.
- A risk analysis before starting the work, and elimination or identification of the sources of danger.
- Basic knowledge of the correct construction and installation or service activities of systems.
- A pressure test to check tightness and a vacuum test to remove moisture.
- Charging the system with the designed charge of toxic refrigerant, and a leak check by a direct method.
- Safe recovery of the toxic refrigerant from the system and filling the system with nitrogen.
- Visual inspection of the tightness of components such as safety valves, and their inspection interval.
- Checking the health and safety measures at the location of the system: signs, emergency exits, gas sensors, gas alarms.
- Calculation of the allowed toxic refrigerant charge in a system according to applicable safety standards.
- Writing the report on the service work, and knowledge of energy efficiency measures with toxic refrigerants.
Under leakage prevention, Annex I requires knowledge of the effects of the release of R717 during installation or maintenance work, through leaks or accidents, and of how to reduce these effects, for example using scrubbers, with proper planning. It is one of the few places where the certification legislation names a technical mitigation measure outright.
For the conditions of the company certificate — a sufficient number of certified persons and proof of tools and procedures, under Article 6(1) — and for the subcontractor check under Article 10(12) of the base regulation, see the guide on low-GWP refrigerants on site.
Why ammonia is never a direct replacement
An ammonia system is not an HFC system with the gas swapped out. It is a different machine. Annex I to Implementing Regulation (EU) 2024/2215 itself lists the differences, under components and design of systems relying on R717:
- Different compressor designs, including compressors with separate motors.
- Capacity control of reciprocating and screw compressors, compressor circuits, single and two-stage compression.
- Evaporative condensers.
- Separator operation and level control, float switches, thermosyphon.
- Different oil management, with non-mixable oils, and oil regulation.
- Basic knowledge of direct systems — direct expansion, flooded, recirculation operation — and of indirect systems.
On top of that sits the separate requirement to know the materials compatible with R717. Material compatibility is not an assembly detail: it decides which pipework, gaskets and fittings may be used, and the wrong choice produces a toxic gas leak.
There is no "ammonia retrofit" of a fluorinated installation. Moving to R-717 means a new project: dedicated circuit, compatible materials, a compliant machinery room, detection, ventilation, respiratory protection and an emergency plan. The difference from a conversion between two fluorinated refrigerants is one of kind, not of degree. See also drop-in or retrofit for the general distinction.
If you are replacing an existing fluorinated installation, its duties remain owed to the end: recovery of the old charge by certified persons under Article 8(1), the entry in the Article 7(1) record for the period during which the equipment was subject to checks, keeping that record 5 years under Article 7(2), and relabelling under Article 12(3) where the equipment stays in use on another gas.
A leak or an exposure: the right order of steps
Withdraw and raise the alarm
The first measure in a toxic gas release is distance, not intervention. Immediate measures come from sections 4 and 6 of the product safety data sheet, not from a general guide.
Do not enter without adequate respiratory protection
Annex I to Implementing Regulation (EU) 2024/2215, heading 14, names gas masks expressly among the personal protective equipment the certified person must know. The type of protection is settled from section 8 of the sheet and the site procedure.
Use the site signs and emergency exits
Heading 14 requires checking, at the location of the system, the health and safety measures: signs, emergency exits, gas sensors and gas alarms, in line with applicable rules.
Isolate the source only if that can be done safely
Ammonia is also a category 2 flammable gas, so ignition sources are removed. Isolation decisions belong to the plant's emergency procedure and to the personnel trained for it.
Give first aid according to the sheet
Section 4 of the product safety data sheet sets out the measures for inhalation, eye contact and skin contact. Ammonia causes severe burns and serious eye damage; exposure needs medical attention.
Record and review
Heading 14 requires a report on the work performed, and knowledge of the effects of an R717 release and of how to reduce them through proper planning, for example using scrubbers, is an examined competence.
The steps above are not an emergency plan. The emergency plan for an ammonia installation is drawn up at design stage, rehearsed and approved under national occupational safety and accident prevention legislation. This page does not replace it.
Cylinders and transport
The transport identification data come from section 14 of the safety data sheet for the specific product, in the format required by Regulation (EU) 2020/878. For the product verified while this page was written:
- UN 1005, proper shipping name AMMONIA, ANHYDROUS.
- Transport hazard class 2.3, with subsidiary label 8 — toxic and corrosive gas.
- Marked as environmentally hazardous.
- Packing group: not applicable.
The 2.3 plus 8 combination matters: ammonia does not travel as a simple flammable gas, but as a toxic gas with an additional corrosive hazard. The applicable Union framework is Directive 2008/68/EC on the inland transport of dangerous goods, and the thresholds, transport document obligations, equipment required on board and training requirements come from there. Not from here.
Cylinders and vessels fall under pressure equipment law: Directive 2014/68/EU for stationary equipment, and the transportable pressure equipment regime for receptacles that travel. Annex I to the certification regulation separately requires visual inspection of the tightness of components such as safety valves and knowledge of their inspection interval.
For responsibility in transit and for what has to stay legible on the receptacle, see the cylinder transport guide. For reading the sheet properly, see how to read a safety data sheet.
Checklist
- The team holds Certificate C for work on ammonia plantArticle 3(2), point (d), of Implementing Regulation (EU) 2024/2215. A1, A2 and B do not cover ammonia.
- The company holds a legal-person certificate for third-party workArticle 2(2) and Article 6(1): enough certified staff plus proof of tools and procedures.
- Respiratory protection is available, checked and appropriateHeading 14 of Annex I names gas masks expressly. The type is settled from section 8 of the sheet and the site procedure.
- Gas detection, signs and emergency exits have been checked on siteHeading 14 requires checking the health and safety measures at the location of the system.
- Component materials are compatible with R717Annex I requires knowledge of compatible materials as a distinct element of competence.
- The charge is the designed one, calculated under the applicable standardsAnnex I requires calculation of the allowed toxic refrigerant charge according to applicable safety standards.
- Safety valves are inspected and their interval is knownAnnex I includes visual inspection of the tightness of components and their inspection interval.
- The safety data sheet is available at the workplaceSections 2 and 9 for hazards and properties, 4 and 6 for incidents, 8 for exposure, 14 for transport.
- Everyone present knows the site emergency planIt is drawn up at design stage under national legislation; it is not improvised during the job.
- If you are replacing a fluorinated installation, the old file is closedRecovery under Article 8, record under Article 7, relabelling under Article 12(3).
Frequently asked questions
Does ammonia need quota or leak checks?
No. Article 16(1) applies to hydrofluorocarbons as defined in Article 3, point (4), and Article 5(1) to equipment containing Annex I or Annex II Section 1 gases. Ammonia is in neither list. It appears only in Annex VI, with GWP 0, for mixture calculations.
Which certificate do I need to work on ammonia plant?
Certificate C, under Article 3(2), point (d), of Implementing Regulation (EU) 2024/2215. It is separate from A1 and A2, which cover fluorinated greenhouse gases and hydrocarbons, and from B, which covers CO2.
Can I convert an R-404A installation to ammonia?
Not in the sense of a retrofit. Annex I to the certification regulation itself lists the design differences for R717 systems: different compressor designs, evaporative condensers, separators with level control, oil management with non-mixable oils, direct and indirect systems. Material compatibility comes on top. In practice it is a new installation, designed for this refrigerant.
If ammonia is flammable, is fire the main risk?
No. The lower flammability limit in the sheet is 15.4 vol %, that is 154 000 ppm, while the EU indicative 8-hour occupational exposure limit value is 20 ppm. The atmosphere becomes dangerous to people long before it becomes flammable. The dominant risk is toxicological.
Will the smell warn me in time?
Do not rely on it. The sheet describes a pungent, suffocating odour but notes expressly that the odour threshold is subjective and inadequate to warn of overexposure. Instrumental detection is necessary.
Does an ammonia cylinder need the F-gas label?
No, because Article 12(1), point (g), covers containers of fluorinated greenhouse gases. What remains is hazard labelling under Regulation (EC) 1272/2008 — H221, H280, H331, H314, H318 and H410 for the product verified here — and the requirements for labelling toxic refrigerants in systems and pressure vessels, which Annex I to the certification regulation puts on the certified person.
What does transport class 2.3 with label 8 mean?
That the product travels as a toxic gas with an additional corrosive hazard. It is read from section 14 of the verified product's sheet, together with UN 1005 and the name AMMONIA, ANHYDROUS. The actual transport conditions are set in the Directive 2008/68/EC regime.
Official sources
Articles 3, 5, 6, 7, 8, 10, 11, 12, 13 and 16, together with Annexes IV and VI, were read directly in the Official Journal text. The certification implementing regulation was read in full, including heading 14 of Annex I. The hazard classification, the exposure limit values and the transport data come from the supplier's safety data sheet.
Currency of this page and limits of responsibility
Ammonia is toxic if inhaled, causes severe skin burns and serious eye damage, is a flammable gas and is very toxic to aquatic life. This page explains its legal position relative to the F-gas Regulation and the competences the certification regulation requires. It is not a safety procedure, it is not an emergency plan, and it carries no charge limits or site requirements. Work is carried out only by trained, certified personnel, on plant designed for this refrigerant.
General information prepared by EgoLog from Regulation (EU) 2024/573, Implementing Regulation (EU) 2024/2215, official Commission material and the supplier's safety data sheet. It is not legal, safety or engineering advice.
Requirements for the machinery room, ventilation, detection, respiratory protection, emergency planning and major-accident prevention fall under other acts and under national rules. Confirm them with the plant designer, your occupational safety service and your national competent authority before any work.