Keentune

Refrigerant Regulations curriculum

9 chapters
·
156 concepts
·
free
Everything the adaptive question bank can teach and test in Refrigerant Regulations, from foundations through advanced practice. Work through it in order, or start practising and let the questions find your level.
New here? Read the Refrigerant Regulations guide
A free 17-minute primer — the mental model, the mistakes beginners make, and what to practise first.
A. Ozone science & the treaty layer
•
Ozone's UV-B shield role; effects of depletion (skin cancer, cataracts, crop/marine damage).
•
CFC destruction mechanism: one chlorine atom destroys many ozone molecules.
•
Ozone is continuously created and destroyed in the stratosphere; a catalyst tips a balance rather than removing a fixed stock.
•
The same molecule is a shield in the stratosphere and a pollutant at ground level.
•
Seasonal polar thinning, polar stratospheric clouds, and why the effect is strongest over Antarctica.
•
UV-A, UV-B and UV-C, and which band the ozone layer actually filters.
•
Skin cancer, cataracts and immune suppression as the human consequences of increased UV-B.
•
Crop yield loss and damage to marine phytoplankton as the ecological consequences.
•
Ozone-depletion potential; R-11 reference = 1.0; CFC > HCFC > HFC (= 0).
•
Global-warming potential; why zero-ODP HFCs are still phased DOWN (AIM Act).
•
A long-lived compound keeps depleting ozone for decades after the release that emitted it.
•
The Montreal Protocol phaseout treaty and the Kigali Amendment (HFCs).
•
The framework convention that made a binding phaseout protocol possible.
•
Successive amendments that accelerated the phaseout, and why the schedule moved more than once.
•
How the HFC phasedown is structured as a mechanism (baselines and step-downs), with the numbers left to the registry.
•
Clean Air Act Title VI; §608 (stationary) vs §609 (MVAC) scope.
•
Which Title VI sections cover production phaseout, safe alternatives, servicing practices, nonessential products and labelling.
•
The regulatory classes of ozone-depleting substances, and which refrigerant families sit in each.
•
The ban on nonessential consumer products that release ozone-depleting substances.
•
Warning-label requirements on containers and products containing or made with controlled substances.
B. Refrigerant families & identification
•
CFC → HCFC → HFC → HFO: falling chlorine content and ODP (R-12, R-22, R-134a, R-410A, R-1234yf).
•
Azeotropic (500-series) vs zeotropic (400-series); temperature glide, fractionation, charge-as-liquid.
•
Ammonia (R-717), CO2 (R-744), hydrocarbons (R-290): toxicity/flammability flags.
•
Cylinder identification and AHRI color conventions; recovery cylinders gray with yellow top.
•
How the R-number encodes the molecule, so an unfamiliar number still tells you something.
•
What the 100, 200, 400, 500, 600 and 700 series each signal about a refrigerant.
•
The toxicity letter and the flammability number read as a pair, not separately.
•
Mildly flammable refrigerants: what the class changes about handling, leak detection and permitted equipment.
•
Higher and lower toxicity classes, and the occupational exposure limit behind the split.
•
Temperature glide expressed as bubble and dew point, and which one a given reading needs.
•
Why a zeotropic blend leaking as vapour shifts the composition of what stays behind.
•
Charging a blend as liquid to preserve its composition, and metering so the compressor is protected.
•
Why a leaked blend is recovered and recharged rather than topped up.
•
Mineral oil, alkylbenzene and polyol ester matched to the refrigerant family they serve.
•
Elastomer, desiccant and oil compatibility checks that precede any retrofit.
•
"Drop-in replacement" is a marketing phrase, not a regulatory or engineering category.
•
Hydrofluoroolefins: the double bond, the short atmospheric lifetime, and the low global-warming potential that follows.
•
Ammonia's toxicity, hydrocarbons' flammability and carbon dioxide's very high operating pressure.
•
DOT specification stamps and test dates on a cylinder, and what each marking authorizes.
C. The §608 rules
•
The 1993 venting ban on ODS and substitutes; de minimis releases during good-faith recovery are not venting.
•
Type I (<5 lb hermetic), Type II (high-pressure), Type III (low-pressure), Universal; Core required for all.
•
Refrigerant sales limited to certified technicians.
•
Recovery equipment AHRI/UL-approved and EPA-registered.
•
Technicians keep certificates; wholesalers/reclaimers retain records ≥3 years.
•
Annualized leak-rate calculation, category trigger rates, the 30-day repair clock, retrofit/retirement plans (rates live in the vertical guide's registry — regime-dependent).
•
Final disposer verifies recovery; small-appliance disposal recovery statement.
•
AHRI 700 purity; reclamation required before refrigerant changes ownership.
•
Recover (remove/store) vs recycle (same-owner cleanup) vs reclaim (re-manufacture to AHRI 700).
•
EPA fines per day per violation; tip bounty concept (never dollar amounts).
•
What counts as an appliance, and why each independent circuit of a multi-circuit system is a separate one.
•
Very high, high, medium and low pressure defined by the refrigerant's saturation pressure at a stated temperature.
•
The permitted methods for establishing a full charge — the denominator every leak calculation runs on.
•
What makes maintenance "major", and how that reclassification changes the required evacuation.
•
The duty to evacuate to the required level AND verify it before the appliance is opened.
•
Non-major service with no later atmospheric release may be opened at 0 psig instead of a deep vacuum.
•
The narrow pressure allowance that exists specifically for changing oil.
•
When leaks make the required level unattainable: isolate, evacuate what you can, never exceed 0 psig.
•
System-dependent equipment is barred above a stated charge size unless permanently attached as a pump-out unit.
•
Owners servicing only their own appliances that have pump-out units.
•
Recovered refrigerant may return to an appliance owned by the same person without reclamation.
•
Substitutes exempt from the venting prohibition in specified END USES — the exemption travels with the use, not the chemical.
•
Knowingly releasing refrigerant AFTER recovering it is a venting violation in its own right.
•
The annualizing method and the rolling-average method, and the duty to apply one consistently across a site.
•
Different trigger rates for commercial refrigeration, industrial process refrigeration and comfort cooling (rates live in the registry).
•
The repair window running from the date the rate is exceeded, and the longer window when a process shutdown is required.
•
Initial and follow-up verification tests: what each proves, and when each must be performed.
•
Periodic leak inspections after a trigger is exceeded, scaled by charge size and sector.
•
Continuous monitoring as an alternative to periodic inspection, and what the system must be able to do.
•
Electing to retrofit or retire instead of repairing, and the deadlines the plan then carries.
•
Evacuating and shutting down suspends the repair clock; adding refrigerant restarts it.
•
The narrow grounds for additional time, and the request that must accompany them.
•
Reporting an appliance that keeps exceeding a high annual leak rate despite repairs.
•
Which duties fall on the certified technician and which on the appliance owner or operator.
D. Core safety
•
Never heat above 125°F; never mix refrigerants in one cylinder.
•
DOT-approved cylinders, 80% max fill, secure upright transport.
•
Cylinder and system pressure-relief devices, and why defeating one is catastrophic.
•
Liquid fills the cylinder, temperature rises, pressure has nowhere to go — the mechanism behind the fill limit.
•
Rejecting damaged, corroded or out-of-test-date cylinders before they are filled.
•
Storage temperature, upright position, valve protection and separation from incompatible materials.
•
Nitrogen only through a pressure regulator and relief valve; NEVER oxygen or compressed air.
•
Regulator and relief valve on every nitrogen use, and the pressures a bare cylinder can deliver.
•
Oxygen or compressed air with refrigerant oil forms an explosive mixture — never used to pressurize a system.
•
Reading the safety data sheet for the SPECIFIC refrigerant before working with it, not a generic one.
•
Liquid refrigerant contact injuries and the immediate response to one.
•
Refrigerant meeting a flame or a hot surface produces toxic decomposition products.
•
Why an open flame near a leak is a health hazard as much as an ignition risk.
•
Why high vapour concentrations are dangerous beyond simple oxygen displacement.
•
Refrigerant monitors and alarms in a machinery room, and the ventilation they command.
•
Ignition-source control, ventilation and leak detection where mildly flammable refrigerants are in use.
•
Refrigerant heavier than air displaces oxygen in low spaces; use the SDS.
•
Pits, basements and equipment rooms where heavier-than-air vapour collects and oxygen does not.
•
De-energising and locking out before service, and the electrical hazards specific to a machinery room.
•
Safety glasses and gloves when connecting/disconnecting hoses (frostbite risk).
E. Technician & equipment certification
•
Anyone who could reasonably be expected to violate the integrity of the refrigerant circuit.
•
Which certification type each appliance class requires, and what each type does NOT authorize.
•
What Universal certification covers, and why it is a sum of the types rather than a separate authority.
•
Servicing MVAC-like appliances requires Type II or the motor-vehicle certification.
•
Persons who only DISPOSE of small appliances, MVACs and MVAC-like appliances are not required to be certified.
•
The apprentice exemption, the close and continual supervision it requires, and its time limit.
•
Keeping the certificate at the place of business, and retaining a copy after leaving the trade.
•
EPA's authority to require a technician to demonstrate proper recovery procedures on site.
•
Losing certification, and what it takes to work on appliances again.
•
How a testing program becomes approved, and what the approval actually covers.
•
Proctoring, identity and accommodation requirements built into program standards.
•
Recovery and recycling equipment must be certified before it may be manufactured or imported.
•
Altering a certified machine's design voids the certification until it is retested.
•
The evacuation levels certified equipment must achieve, keyed to appliance class and charge size.
•
The role of an approved equipment testing organization in the certification chain.
•
Equipment must be used per the manufacturer's directions unless those directions conflict with the rule.
F. Recordkeeping, reporting & enforcement
•
What the individual technician must hold, and for how long.
•
The documentation a servicing person must hand the owner after adding or removing refrigerant.
•
Full charge, leak rates, inspections, verification tests and repairs as the owner's file.
•
Records required when evacuating appliances in a stated charge range for disposal.
•
Signed statements or contracts the final processor keeps, and the retention period on them.
•
Invoices showing purchaser, date and quantity for every non-exempt refrigerant sale.
•
Batch analysis records, sender records, and the periodic report a reclaimer files.
•
The default retention clock, and the records that run on a different one.
•
Which items go to EPA rather than staying in the file: extensions, plans, chronic leakers.
•
Falsifying a record or a certification as an independent violation.
•
EPA's authority to inspect records and request information, and who must produce them.
•
Penalties assessed per day per violation, and why the count matters more than the rate.
•
Technician, owner, contractor, wholesaler and disposer as separately liable parties.
•
The procedure by which a certification is suspended or revoked, and the response available.
•
Reporting a suspected violation, and the reward concept attached to it.
G. HFC management under the AIM Act
•
Phase down production and consumption, facilitate technology transitions, and manage HFCs already in use.
•
Production and consumption allowances as the phasedown mechanism (step percentages live in the registry).
•
Why the phasedown is measured in exchange-value-weighted terms rather than raw tonnes.
•
Sector-by-sector restrictions on high-GWP HFCs in newly manufactured equipment.
•
Compliance dates that attach to manufacture versus installation, and what may still be sold in between.
•
Extending leak repair, recovery and recordkeeping duties to appliances containing HFCs.
•
Requirements to service with reclaimed rather than virgin refrigerant in specified equipment.
•
Refrigerant container tracking and the labelling that makes it auditable.
•
Recovering the residual heel before a disposable cylinder leaves the site.
•
Fire suppression, foam and aerosol end uses the HFC rules also reach.
•
Controls on import, export and transhipment of regulated substances.
•
The HFC rules sit on top of §608 rather than replacing it; where a technician follows both at once.
H. Section 609 MVAC & adjacent programs
•
Motor-vehicle air conditioners as a separate program with its own certification and equipment rules.
•
The separate certification required to service MVACs for consideration.
•
Refrigerant-specific recovery equipment standards on the motor-vehicle side.
•
The evacuation standard applied when a motor-vehicle system is recovered for disposal.
•
Unique service fittings and labels required when a vehicle system is converted.
•
Why a state program can be stricter than the federal floor, and how a technician finds out which applies.
•
What makes an appliance MVAC-like, including the charge limit inside the definition.
•
The small-container sales rule for motor-vehicle refrigerant and the self-sealing valve requirement.
•
The nonessential-products ban and the consumer items it actually reaches.
•
Warning-label requirements on containers and on products made with controlled substances.
I. Acceptable substitutes & the SNAP program
•
Evaluating a substitute on overall risk across several dimensions rather than on one attribute.
•
Acceptable, acceptable subject to use conditions, acceptable subject to narrowed use limits, and unacceptable.
•
What a use condition looks like in the field, and why it binds the installing technician too.
•
A substitute acceptable in one end use can be unacceptable in another — the listing is not a property of the chemical alone.
•
A listing can be narrowed or reversed, which is why "it was approved once" is not a defence.
•
Charge-size limits, markings and equipment requirements attached to hydrocarbon listings.
•
Converting equipment to a refrigerant it was not designed for is both a safety and a compliance failure.
•
Labelling a converted or retrofitted system so the next technician is not misled by the nameplate.
•
Mixed refrigerants cannot be reclaimed to specification and must be destroyed — the cost of one careless cylinder.
•
Counterfeit refrigerant and contaminated cylinders as a real and dangerous supply-chain hazard.
Keentune is not affiliated with or endorsed by the organizations whose documentation informs these maps.
All about Refrigerant Regulations practice
Also on your phone
App StoreGoogle Play
All exam, test, and product names and trademarks are the property of their respective owners and are used here for identification and reference only. Keentune is independent study practice — not affiliated with, authorized, or endorsed by any of these organizations.
© 2026 SportaApp LLC