1127.1 General. Cooling towers, evaporative coolers and

fluid coolers shall be provided with an approved water supply, sized for peak demand. The quality of water shall be provided in accordance with the equipment manufacturer’s recommendations. The piping system and protection of the potable water supply system shall be installed in accordance with the plumbing code.

248 2025 CALIFORNIA MECHANICAL CODE

REFRIGERATION

TABLE 1102.3 REFRIGERANT GROUPS, PROPERTIES, AND ALLOWABLE QUANTITIES [7]

[ASHRAE 34: TABLE 4-1, TABLE 4-2]

REFRIGERATION

TABLE 1102.3 (continued) REFRIGERANT GROUPS, PROPERTIES, AND ALLOWABLE QUANTITIES [7]

[ASHRAE 34: TABLE 4-1, TABLE 4-2]

250 2025 CALIFORNIA MECHANICAL CODE

REFRIGERATION

TABLE 1102.3 (continued) REFRIGERANT GROUPS, PROPERTIES, AND ALLOWABLE QUANTITIES [7]

[ASHRAE 34: TABLE 4-1, TABLE 4-2]

REFRIGERATION

TABLE 1102.3 (continued) REFRIGERANT GROUPS, PROPERTIES, AND ALLOWABLE QUANTITIES [7]

[ASHRAE 34: TABLE 4-1, TABLE 4-2]

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REFRIGERATION

TABLE 1102.3 (continued) REFRIGERANT GROUPS, PROPERTIES, AND ALLOWABLE QUANTITIES [7]

[ASHRAE 34: TABLE 4-1, TABLE 4-2]

REFRIGERATION

TABLE 1102.3 (continued) REFRIGERANT GROUPS, PROPERTIES, AND ALLOWABLE QUANTITIES [7]

[ASHRAE 34: TABLE 4-1, TABLE 4-2]

For SI units: 1 pound = 0.453 kg, 1 cubic foot = 0.0283 m [3]

Notes: 1 The preferred chemical name is followed by the popular name in parenthesis. 2 The OELs are 8-hour TWAs; a “C” designation denotes a ceiling limit. 3 Azeotropic refrigerants exhibit some segregation of components at conditions of temperature and pressure other than those at which they were formulated. The extent of segregation depends on the particular azeotrope and hardware system configuration. 4 The exact composition of this azeotrope is in question and additional experimental studies are needed. 5 R-507, R-508, and R-509 are allowed alternative designations for R-507A, R-508A, and R-509A due to a change in designations after assignment of R-500 through R-509. Corresponding changes were not made for R-500 through R-506. 6 The RCL values for these refrigerant blends are approximated in the absence of adequate data for a component comprising less than 4 percent m/m of the blend and expected to have a small influence in an acute, accidental release. 7 In accordance with Section 1102.3, ammonia refrigeration systems are not regulated by this chapter. R-717 (ammonia) is included in this table because the table is extracted from ASHRAE 34 and is not capable of being modified. 8 LFL is based on WCF @ 73.4°F (23°C) unless otherwise noted. 9 WCFF LFL @ 140°F (60°C). 10 WCFF LFL @ 73.4°F (23°C). 11 WCF LFL @ 212°F (100°C).

254 2025 CALIFORNIA MECHANICAL CODE

CALIFORNIA MECHANICAL CODE – MATRIX ADOPTION TABLE