HVAC Safety Practices 2

Question 1

When working with refrigerants, which type of gloves should HVAC technicians wear to prevent frostbite?

Accepted Answer

Cryogenic or chemical-resistant gloves

Answer

Cryogenic or chemical-resistant gloves protect against refrigerant contact, which can cause severe frostbite at extremely low temperatures.

Question 2

What is the minimum safe distance a technician should maintain from an electrical panel before beginning work on an HVAC system connected to it?

Accepted Answer

Follow NFPA 70E arc flash boundary requirements based on voltage

Answer

NFPA 70E establishes arc flash protection boundaries that vary based on system voltage and available fault current.

Question 3

Which color label on a refrigerant cylinder indicates it contains a blend/mixed refrigerant?

Accepted Answer

A solid color assigned to that specific blend

Answer

ARI/AHRI assigns specific colors to individual refrigerants and blends, so each refrigerant type has its own designated cylinder color.

Question 4

A technician is about to braze copper refrigerant lines in a confined mechanical room. What is the MOST critical safety precaution?

Accepted Answer

Provide adequate ventilation and have a fire extinguisher ready

Answer

Brazing produces toxic fumes and open flame, requiring adequate ventilation and a fire extinguisher immediately accessible.

Question 5

What does OSHA require when an HVAC technician must work on a rooftop unit within 6 feet of an unguarded roof edge?

Accepted Answer

Fall protection such as guardrails, safety nets, or personal fall arrest systems

Answer

OSHA 29 CFR 1926.502 requires fall protection (guardrails, safety nets, or personal fall arrest) when within 6 feet of an unprotected edge.

HVAC Practice Test