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11 March, 03:15

Under EPA's regulations, which of the following methods can be used to pressurize an R11 or R123 system for the purpose of opening the system for a non-major repair?

A. Adding nitrogen

B. Warming the refrigerant

C. Adding compressed air

D. Adding carbon dioxide

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Answers (1)
  1. 11 March, 05:24
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    (A) Adding Nitrogen

    Explanation:

    R11 or R123 are flammable substance under certain conditions when mixed with Oxygen, adding Nitrogen is a safety procedure used in displacing any R11 or R123 which are considered as hazardous when mixed with Oxygen.
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