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Section 608 (together withSection 609, which covers motor vehicles) of theClean Air Act serves as the main form ofoccupational licensure for technicians in theheating, ventilation, and air conditioning (HVAC) industry in the United States.[1] The law requires that all persons who maintain, service, repair or dispose of appliances that contain regulatedrefrigerants be certified in proper refrigerant handling techniques.[2] The regulatory program helps to minimize the release of refrigerants, and in particular ozone depleting refrigerants such aschlorofluorocarbons andhydrofluorocarbons, as well as other regulated refrigerants as determined bySection 612. The licensure program complies with the requirements under theMontreal Protocol. TheEnvironmental Protection Agency (EPA) published implementing regulations at 40 CFR Part 82.[3]
There are four categories of certification:
| Type | Application |
|---|---|
| I | Persons who maintain, service or repair small appliances with less than 5 lbs of refrigerant. |
| II | Persons who maintain, service, repair or dispose of high pressure appliances, except for small appliances. |
| III | Persons who maintain, service, repair, or dispose of low pressure appliances. |
| Universal | Persons who maintain, service, repair, or dispose of any appliance in categories of types I, II, or III. |
A technician with the required level of certification may also legally purchase regulated refrigerants. And technicians who violate the Clean Air Act provisions may be fined, lose their certification, and may be required to appear in Federal court.[4]
In general, along with general enforcement provisions, section 608 manages the following regulatory requirements:
For Type I systems the main requirement is to remove 80% of the refrigerant if the appliance's compressor is not running and 90% if running and evacuate to a 4 inch Hg vacuum.
For Type II or Type III applications, the appliance must be evacuated to the following levels for device manufactured after November 15, 1993 in order to recover the refrigerant
| Application | Required Evacuation |
|---|---|
| Very high pressure | 0"Hg |
| High pressure w/<200 lbs of refrigerant | 0"Hg |
| High pressure w/>=200 lbs of refrigerant | 10"Hg |
| Medium pressure w/<200 lbs of refrigerant | 10"Hg |
| Medium pressure w/>=200 lbs of refrigerant | 15"Hg |
| Low pressure (Type III) | 25mm Hg absolute |
Where pressure classification of the refrigerant is defined by the refrigerant's pressure at 104F as
| Type | Pressure |
|---|---|
| Very High Pressure | Above 355 psia |
| High Pressure | Between 170 and 355 psia |
| Medium Pressure | Between 45 psia and 170 psia |
| Low Pressure | Below 45 psia |
For systems containing 50 lbs or more of refrigerant, for each service, the owner must be supplied with information of:
And such records must be held for 3 years.[8]
Additionally, if an appliance leaks more than 125% of refrigerant, it must be reported to the EPA.[9]
Leaks must be repaired in systems with greater than 50 lbs of refrigerant if the leak rate exceeds
| Application | Annual Leak Rate % |
|---|---|
| Industrial Process Refrigeration | 30% |
| Commercial Refrigeration | 20% |
| Comfort/Residential Cooling | 10% |
In which case, they must be repaired within 30 days/120 if industrial process shutdown is required. An initial verification test must then be done within 30/120 days, and then a follow-up test within 10 days of that. There are additional clauses for extensions if needed.
If the leak is not to be repaired, there must be a plan to retire or retrofit the appliance within 30 days, to be completed within one year.[10]
If more than a year is required, a report must be submitted, which must include:
Additional leak inspection frequencies following a leak must regard the following until the leak rate is within acceptable levels:
| System Size | Application | Frequency |
|---|---|---|
| >=500lbs | Industrial Process and Commercial Refrigeration | Every 3 months for a year. |
| <500 lbs and >=50lbs | Industrial Process and Commercial Refrigeration | Annually |
| -- | Comfort/Residential Cooling | Annually |
These leak inspections may be bypassed if the system is installed with an automatic leak detection system.[11]
EPA regulations require the test to be a "closed book" proctored exam. The only outside materials allowed are a temperature / pressure chart, scratch paper and a calculator. The certification exam contains 4 sections: Core, Type I, Type II, and Type III. Each section contains 25 multiple choice questions. The technician must achieve a passing score of 70% in each Type in which they are to be certified. All technicians must pass the CORE section before receiving any certification. A technician seeking certification must correctly answer 18 out of 25 questions on the CORE and at least one other section of the exam. A technician seeking Universal certification must correctly answer 18 out of 25 questions on each section of the exam.
In addition to covering EPA (in particular, Section 608) regulations, the exam also covers basic safety and occupational practices, along with fundamental concepts ofstratospheric ozone protection (which are typically part of the Core exam).[2]
Many universities and colleges also have associate degrees and apprenticeship programs that teach HVAC fundamentals along with providing EPA examinations.[12][13][14]
