Question

A system containing a flammable refrigerant must have the process tubes marked with a ________ color.

a) red
b) green
c) blue
d) yellow

Answer 1

Process tubes for systems with flammable refrigerants should be marked with a yellow color to denote flammability and ensure safety.

Step-by-step explanation:

A system containing a flammable refrigerant must have the process tubes marked with a yellow color. The correct answer is d) yellow. The color-coding is critical for safety to ensure that technicians and service personnel can easily identify the type of refrigerant used in the system, with yellow typically being associated with flammability.