What respiratory equipment must a technician wear to enter a machine room after a large refrigerant release?
Correct Answer
B) A self-contained breathing apparatus
Refrigerant vapor is heavier than air and settles low in a room, pushing oxygen out as it accumulates. A person walking into that space can lose consciousness with little warning, and a low-pressure chiller holds enough refrigerant to fill a machine room. Only a self-contained breathing apparatus supplies its own clean air and works no matter how little oxygen is left in the space. Filtering devices depend on there being breathable air to filter, so they offer no protection at all in an oxygen-deprived room.
Why This Is the Correct Answer
A self-contained breathing apparatus carries its own air supply, so it protects the wearer in an atmosphere that is short on oxygen as well as loaded with vapor. That is exactly the condition created when a large charge of heavy refrigerant vapor floods a machine room and settles toward the floor.
Why the Other Options Are Wrong
Option A: A disposable dust mask rated for particulates
A dust mask stops particles only. It does nothing about refrigerant vapor and supplies no oxygen, so wearing one into a flooded machine room gives a false sense of safety.
Option C: A half-face cartridge respirator with organic vapor filters
A cartridge respirator filters contaminants out of the surrounding air, which only works if that air still holds enough oxygen. In a room where refrigerant has displaced the oxygen, it cannot keep the wearer alive.
Option D: Chemical splash goggles worn with neoprene gloves
Goggles and gloves guard the eyes and skin against liquid splash. They protect nothing about breathing and are not respiratory equipment at all.
Memory Technique
Bring your own air: if the room stole the oxygen, only a tank on your back gives it back.
Reference Hint
Refrigerant vapor displaces oxygen; entry into a flooded machine room requires self-contained breathing apparatus and machine rooms use oxygen deprivation monitors.
More epa-608-type-3 Questions
Some jobs on a chiller count as a major repair under the refrigerant rules, which changes what a technician is allowed to do with a badly leaking machine. Which job falls into that category?
An owner asks how many pounds of refrigerant the rules allow to be left inside a chiller once the recovery has been signed off. What is the correct answer to give him?
The motor of a hermetic centrifugal chiller sits inside the pressure boundary rather than outside it on a shaft. What follows from that construction?
An oxygen monitor is used to decide whether a chiller machine room is safe to enter after a refrigerant release. Below what oxygen reading is the atmosphere treated as oxygen deficient?
A low-pressure chiller's rupture disc has a discharge line running from it. Where does that line have to terminate?
A refrigerant vapor detector in a chiller machine room reaches its alarm level. Besides sounding, what is that alarm expected to do?
Which piece of equipment requires a technician to hold Type III certification before it may be serviced?
What property of the refrigerant is what actually places an appliance into the low-pressure category?
During normal operation, what condition exists inside the evaporator of a running low-pressure centrifugal chiller?
In what unit is the required final recovery vacuum for a low-pressure appliance normally expressed?
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