CRST Safety Procedures & Environmental Regulations 4 — Questions and Answers
Question 1: What is the primary purpose of the Montreal Protocol as it relates to refrigeration technicians?
- Regulate safe refrigerant storage pressures
- Phase out ozone-depleting substances globally (Correct answer)
- Establish technician certification standards
- Set refrigerant purity standards for reclaimed refrigerants
Correct answer: Phase out ozone-depleting substances globally
The Montreal Protocol is an international treaty that established schedules for phasing out ozone-depleting substances, including CFC and HCFC refrigerants.
Question 2: When should a technician use a self-contained breathing apparatus (SCBA) rather than a supplied-air respirator during refrigerant work?
- When working with HFC refrigerants only
- In immediately dangerous to life or health (IDLH) atmospheres (Correct answer)
- Only when ammonia concentration exceeds 500 ppm
- Whenever refrigerant odor is detectable
Correct answer: In immediately dangerous to life or health (IDLH) atmospheres
SCBA is required in IDLH atmospheres where immediate danger exists, as it provides a self-contained air supply independent of the surrounding environment.
Question 3: Which type of fire extinguisher is appropriate for an electrical fire involving a refrigeration control panel?
- Class A (water)
- Class B (foam)
- Class C (CO2 or dry chemical) (Correct answer)
- Class D (dry powder)
Correct answer: Class C (CO2 or dry chemical)
Class C extinguishers are rated for electrical fires and use non-conductive agents like CO2 or dry chemical that won't create electrocution hazards.
Question 4: What is the correct procedure for disposing of a refrigerant cylinder that has been emptied to EPA standards?
- Puncture the cylinder and discard in regular trash
- Return it to the refrigerant supplier for reuse or disposal (Correct answer)
- Vent remaining pressure and leave at the job site
- Mark it empty and store indefinitely
Correct answer: Return it to the refrigerant supplier for reuse or disposal
Empty cylinders should be returned to the supplier, as they may contain residual refrigerant and are subject to DOT regulations even when emptied.
Question 5: A technician discovers an unknown refrigerant in a system. Why is mixing it with a known refrigerant in a recovery cylinder prohibited?
- It increases the cylinder pressure above safe limits
- Mixed refrigerants cannot be reclaimed and must be destroyed (Correct answer)
- It invalidates the technician's EPA certification
- It causes chemical reactions that damage the recovery machine
Correct answer: Mixed refrigerants cannot be reclaimed and must be destroyed
Reclaimers cannot process contaminated or mixed refrigerants, so blended unknown refrigerants must be destroyed rather than reclaimed.
Question 6: Under the GWP-based regulations in the AIM Act, which action is required for high-GWP HFCs in certain equipment sectors?
- Immediate venting and system decommissioning
- Phased reduction in production and use (Correct answer)
- Mandatory conversion to natural refrigerants only
- Annual emission reporting to the EPA
Correct answer: Phased reduction in production and use
The AIM Act authorizes EPA to phase down HFC production and use through an allowance system, targeting high-GWP refrigerants across equipment sectors.
Question 7: What is the minimum vacuum level (in microns) required before charging most commercial refrigeration systems to ensure proper moisture removal?
- 5,000 microns
- 2,000 microns
- 500 microns (Correct answer)
- 50 microns
Correct answer: 500 microns
Most manufacturers and industry standards require evacuation to 500 microns or lower to ensure adequate moisture removal before charging.
CRST Safety Procedures & Environmental Regulations 4
What is the primary purpose of the Montreal Protocol as it relates to refrigeration technicians?