EPA Section 609 MVAC Practice Test

Answer choices

1. A. Rely on flame-resistant clothing instead of controlling the work area
2. B. Keep doors closed during charging to contain the refrigerant
3. C. Use an open-flame torch to warm components and speed recovery
4. D. Separate or stop spark/flame/high-heat operations and prepare the bay with the required R-1234yf ventilation and safety controls

Wrong-answer review

• A. Rely on flame-resistant clothing instead of controlling the work area: Incorrect. PPE does not replace ventilation and ignition-source control.
• B. Keep doors closed during charging to contain the refrigerant: Incorrect. MACS advises ventilation and avoiding accumulation.
• C. Use an open-flame torch to warm components and speed recovery: Incorrect. Open flame is incompatible with R-1234yf safety precautions.

Answer choices

1. A. Dilute the mixture with virgin refrigerant until the identifier passes
2. B. Return the mixture to the vehicle without further assessment
3. C. Use a dedicated recover-only unit and a separate recovery container for suspect refrigerant instead of contaminating normal service equipment
4. D. Transfer the mixture into a clean refrigerant supply cylinder; the technician treats ordinary handling as sufficient without a separate recycling or reclamation step

Answer choices

1. A. Any PAG oil is interchangeable across all MVAC systems; the shop uses the same procedure for every refrigerant and vehicle
2. B. Mix mineral oil and PAG oil to improve compatibility; the technician treats a quick operational check as sufficient for the remaining service
3. C. Reuse recovered oil if it has no visible debris; the shop assumes the available tool or reading is adequate without a compatibility check
4. D. Use the lubricant type and viscosity specified for that vehicle/compressor and restore only the appropriate amount

Answer choices

1. A. Blend a small amount with R-134a to reduce flammability; the technician assumes all non-ozone-depleting refrigerants are interchangeable
2. B. A compatible fitting proves the refrigerant is approved; the technician treats refrigerant chemistry as the only factor that controls legal use
3. C. Treat the existing charge as contaminated/possibly flammable and use an appropriate safe recovery and disposition process
4. D. Vent the hydrocarbon charge before connecting recovery equipment

Answer choices

1. A. The certified equipment is the compliant choice when it is appropriate for the refrigerant and service being performed
2. B. A homemade recovery device is acceptable if no refrigerant is visibly released; the technician assumes recovery and recycling are interchangeable operations
3. C. A manufacturer's advertising claim is enough even without the applicable certification
4. D. Use the unlisted machine if the customer signs a waiver; the shop treats containment alone as equivalent to the required refrigerant-processing step

Answer choices

1. A. Any container under 20 pounds is exempt from technician-certification sales restrictions; the customer approved the work and the shop treats that approval as sufficient
2. B. EPA provides a limited exception for qualifying small cans used for MVAC DIY service; it is not true that every R-134a sale requires a certification card
3. C. A 30-pound cylinder qualifies if the customer promises to use only a few ounces; the technician assumes internal shop policy can substitute for the specific federal rule
4. D. Any small can is exempt even if it lacks the unique fitting; the shop treats that condition as an exception to the normal federal requirement; no additional source check is made

Answer choices

1. A. Blend the suspect refrigerant with known R-134a until the readings normalize; the shop uses the same procedure for every refrigerant and vehicle
2. B. Stop normal service, treat the refrigerant as suspect, and use the appropriate contaminated-refrigerant identification/recovery procedure
3. C. Vent a sample and identify it by smell
4. D. Trust the cylinder label because counterfeit refrigerant is impossible; the shop assumes the available tool or reading is adequate without a compatibility check

Answer choices

1. A. Use R-134a hoses because CO2 is nonflammable; the technician assumes all non-ozone-depleting refrigerants are interchangeable
2. B. Section 609 does not apply to CO2 because CO2 can be vented; the technician treats refrigerant chemistry as the only factor that controls legal use
3. C. Use equipment, fittings, and procedures specifically designed for the much higher pressures of the R-744 MVAC
4. D. Reduce pressure by venting through an R-134a manifold; the shop assumes a lower-GWP product is automatically acceptable in any MVAC application

Answer choices

1. A. Use pressure alone to prove the refrigerant is R-1234yf; the shop assumes one precaution alone addresses all of the A2L service hazards
2. B. Identify the actual refrigerant first; the label is a starting point but does not rule out contamination
3. C. Vent a small sample to identify the refrigerant by odor; the shop treats refrigerant-specific equipment and ignition controls as optional
4. D. Assume aftermarket adapters confirm the correct refrigerant; the technician assumes the ordinary R-134a workflow provides equivalent protection

Answer choices

1. A. Any field a shop finds useful automatically becomes an EPA requirement
2. B. The technician must give the customer a copy of the certification card and training manual
3. C. Any missing shop-created field is automatically a federal violation
4. D. Do not invent a universal per-service three-year record rule; apply the specific EPA recordkeeping provisions that fit the transaction