In the 2021 International Mechanical Code (IMC), the International Association of Ammonia Refrigeration (IIAR) was successful in simplifying the code requirements for refrigeration systems using Anhydrous Ammonia (NH3). The code now reads:
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1101.1.2 Ammonia refrigerant Refrigeration systems using ammonia as the refrigerant shall comply with IIAR 2, IIAR 3, IIAR 4, and IIAR 5 and shall not be required to comply with this chapter. |
Here is a look at the REVISED code requirements for refrigeration systems using refrigerants OTHER than NH3: