EPA 608 Type 1 vs Type 2 vs Type 3

The short answer

Certification	Equipment you may service	Typical job
Core + Type I	Factory-sealed appliances with 5 lb or less of refrigerant	Domestic refrigerators, window A/C, dehumidifiers, vending machines
Core + Type II	High- and very-high-pressure appliances that are not small appliances or car A/C	Split systems, rooftops, walk-ins, supermarket racks
Core + Type III	Low-pressure appliances	Centrifugal chillers (R-11, R-123 and similar)
Universal	All of the above	Core + Type I + Type II + Type III

Core is required for every type. Passing Core plus one type earns that type. Passing Core plus all three earns Universal, which most HVAC/R shops want.

Motor vehicle air conditioning is Section 609, not 608. A Type II card does not let you empty a car's A/C system.

Type I — small appliances

A small appliance is fully manufactured, charged and hermetically sealed in a factory with five pounds or less of refrigerant.

Field-charged equipment is never Type I, even if the charge is under 5 lb. An 8 lb R-410A split system is Type II.

Numbers Type I hammers:

• Working compressor: recover 90% or pull 4 in. Hg
• Dead compressor: recover 80% or pull 4 in. Hg
• Passive (system-dependent) recovery: appliances with 15 lb or less only
• Recovery gear manufactured after November 15, 1993 must be certified

If you mostly swap refrigerators, window units and vending machines, Type I plus Core is enough. If you also braze on splits, you need Type II.

Practice the Type I question bank.

Type II — high-pressure appliances

Type II is the residential and light-commercial HVAC/R section: condensing units, packaged rooftops, refrigeration racks, and very-high-pressure industrial gases such as R-13 / R-23 / R-503.

It is not defined by “the pressure feels high.” R-410A is Type II. A window unit with R-410A that left the factory sealed with 2 lb is still Type I.

Numbers Type II hammers:

• Leak-repair program starts at 50 lb of charge
• Leak-rate thresholds: comfort cooling 10%, commercial refrigeration 20%, industrial process 30%
• Repair clock is typically 30 days (or mothball / retire)
• Evacuation table (post-11/15/93 equipment): R-22 under 200 lb → 0 in. Hg; R-22 200 lb or more → 10 in. Hg; other high-pressure 200 lb or more → 15 in. Hg; very-high-pressure → 0 in. Hg
• Recover liquid first when you can; never pressurize with oxygen or compressed air

If you install or service split systems, you want Type II. Most techs who take Type II also take Type I and Type III in the same sitting and walk out Universal.

Practice the Type II question bank.

Type III — low-pressure appliances

Type III is almost entirely centrifugal chillers that operate in a vacuum on the low side (R-11, R-113, R-123 and similar). Air leaks in. Purge units exist because of that.

Numbers Type III hammers:

• Leak test: do not exceed about 10 psig
• Rupture disc: typically 15 psig
• Major-repair evacuation (post-11/15/93 equipment): 25 mm Hg absolute
• Charge vapor first so water in the tubes does not freeze, then liquid
• Excessive purge run-time means the machine is leaking

A Type II tech is not certified to open a low-pressure chiller. A Type III tech is not certified to recover a split system.

Practice the Type III question bank.

Which combination should you book?

• Appliance repair only → Core + Type I
• Residential / light commercial HVAC → Core + Type I + Type II (add Type III if your shop has chillers)
• Chiller plant / facilities → Core + Type III (add Type II if you also own rooftops)
• Default for employment → Universal (Core + I + II + III)

You can add a type later. Credit for sections you already passed is kept; you retake only the section you need.

How CertReady maps to the real exam

Each official section is 25 questions, 18 correct (72%) to pass. CertReady’s mock exam is a 25-question timed mix so you practice that pacing. Drill one type until you are consistently above 80% on that category, then sit a full mock.

See the passing score guide, Universal certification, who needs 608 and taking the exam online.