What is the primary reason for concern about HCFC-22 concentration in an engine room?

The primary concern regarding HCFC-22 concentration in an engine room is oxygen deprivation. HCFC-22, or hydrochlorofluorocarbon-22, is a refrigerant that can displace oxygen in the environment if it is present in high concentrations. When the concentration of HCFC-22 rises, it can reduce the amount of breathable air available, potentially leading to a hazardous situation where the oxygen levels are insufficient for safe respiration. This is particularly critical in enclosed or poorly ventilated spaces such as engine rooms where refrigerants might leak.

Although other factors, like ozone depletion, equipment corrosion, and pressure buildup, are relevant in different contexts regarding refrigerants and their impact on the environment and system integrity, they do not represent the immediate danger that oxygen deprivation poses in a confined working area. Understanding the risks of refrigerants in terms of personal safety is crucial for operators working in such environments.