- The corresponding TLV-TWA values shown in the California Mechanical Code for the refrigerant classification.
- 25 percent of the lower flammable limit (LFL).
Flammable and combustible materials shall not be stored in machinery rooms for refrigeration systems having a refrigerant circuit containing more than 220 pounds (100 kg) of Group A1 or 30 pounds (14 kg) of any other group refrigerant. Storage, use or handling of extra refrigerant or refrigerant oils shall be as required by Chapters 50, 53, 55 and 57.
- Directly to atmosphere where the fire code official determines, on review of an engineering analysis prepared in accordance with Section 104.7.2, that a fire, health or environmental hazard would not result from atmospheric discharge of ammonia.
- Through an approved treatment system in accordance with Section 606.12.6.
- Through a flaring system in accordance with Section 606.12.7.
- Through an approved ammonia diffusion system in accordance with Section 606.12.8.
- By other approved means.
Exception: Ammonia/water absorption systems containing less than 22 pounds (10 kg) of ammonia and for which the ammonia circuit is located entirely outdoors.
Where refrigerants of Groups A2, A3, B2 and B3, as defined in the California Mechanical Code, are used, refrigeration machinery rooms shall conform to the Class I, Division 2 hazardous location classification requirements of the California Electrical Code.
|Refrigerant||Q (m 3/sec)||Q (cfm)|