Washington DC 3rd Class Boiler Practice Test

The color for an R-134A refrigerant cylinder is _______?

Light blue Orange Green Black

Correct Answer:

Light blue

Explanation:

Color coding helps you identify the refrigerant at a glance and prevents charging with the wrong gas. The cylinder for R-134A is typically light blue, which provides a quick visual cue that it contains R-134A. This standard color helps differentiate it from other refrigerants—orange is commonly used for some blends like R-410A, green for others, and black isn’t a standard refrigerant color. Always read the cylinder label and markings as well, since colors can vary by supplier or region and labeling confirms exactly what’s inside.

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