Skip to content

Chapter 11 — REFRIGERATION

1126.1 General. Cooling towers, evaporative condensers,

California Mechanical Code (Title 24, Part 4) · 2022 edition · updated 2026-09-10 · California

Italicized text is a California amendment to the model code, as printed in the official publication.

and fluid coolers shall be equipped with drift eliminators that have a drift rate of not more than 0.005 percent of the circulated water flow rate in accordance with the equipment manufacturer’s instructions.

2022 CALIFORNIA MECHANICAL CODE 231

REFRIGERATION

TABLE 1102.3 REFRIGERANT GROUPS, PROPERTIES, AND ALLOWABLE QUANTITIES 8

[ASHRAE 34: TABLE 4-1, TABLE 4-2]
REFRIGERANT CHEMICAL FORMULA CHEMICAL NAME1
(COMPOSITION FOR BLENDS)		 SAFETY
GROUP7		 OEL2
(ppm)		 POUNDS PER 1000
CUBIC FEET OF SPACE
R-11 CCl3F Trichlorofluoromethane A1 C1000 0.39
R-12 CCl2F2 Dichlorodifluoromethane A1 1000 5.6
R-12B1 CBrClF2 Bromochlorodifluoromethane –– –– ––
R-13 CClF3 Chlorotrifluoromethane A1 1000 ––
R-13B1 CBrF3 Bromotrifluoromethane A1 1000 ––
R-14 CF4 Tetrafluoromethane (carbon tetrafluoride) A1 1000 25
R-21 CHCl2F Dichlorofluoromethane B1 –– ––
R-22 CHClF2 Chlorodifluoromethane A1 1000 13
R-23 CHF3 Trifluoromethane A1 1000 7.3
R-30 CH2Cl2 Dichloromethane (methylene chloride) B1 –– ––
R-31 CH2ClF Chlorofluoromethane –– –– ––
R-32 CH2F2 Difluoromethane (methylene fluoride) A2L 1000 4.8
R-40 CH3Cl Chloromethane (methyl chloride) B2 –– ––
R-41 CH3F Fluoromethane (methyl fluoride) –– –– ––
R-50 CH4 Methane A3 1000 ––
R-113 CCl2FCClF2 1, 1, 2-trichloro-1, 2, 2 – trifluoroethane A1 1000 1.2
R-114 CClF2CClF2 1, 2-dichloro-1, 1, 2, 2 tetrafluoroethane A1 1000 8.7
R-115 CClF2CF3 Chloropentafluoroethane A1 1000 47
R-116 CF3CF3 Hexafluoroethane A1 1000 34
R-123 CHCl2CF3 2, 2-dichloro-1, 1, 1, - trifluoroethane B1 50 3.5
R-124 CHClFCF3 2-chloro-1, 1, 1, 2 - tetrafluoroethane A1 1000 3.5
R-125 CHF2CF3 Pentafluoroethane A1 1000 23
R-134a CH2FCF3 1, 1, 1, 2-tetrafluoroethane A1 1000 13
R-141b CH3CCl2F 1, 1-dichloro-1-fluoroethane –– 500 0.78
R-142b CH3CClF2 1-chloro-1, 1-difluoroethane A2 1000 5.1
R-143a CH3CF3 1, 1, 1-trifluoroethane A2L 1000 4.5
R-152a CH3CHF2 1, 1-difluoroethane A2 1000 2.0
R-170 CH3CH3 Ethane A3 1000 0.54
R-E170 CH3OCH3 Methoxymethane (Dimethyl ether) A3 1000 1.0
R-218 CF3CF2CF3 Octafluoropropane A1 1000 43
R-227ea CF3CHFCF3 1, 1, 1, 2, 3, 3, 3-heptafluoropropane A1 1000 36
R-236fa CF3CH2CF3 1, 1, 1, 3, 3, 3-hexafluoropropane A1 1000 21
R-245fa CHF2CH2CF3 1, 1, 1, 3, 3-pentafluoropropane B1 300 12
R-290 CH3CH2CH3 Propane A3 1000 0.56
R-C318 -(CF2)4- Octafluorocyclobutane A1 1000 41
R-400 zeotrope R-12/114 (50.0/50.0) A1 1000 10
R-400 zeotrope R-12/114 (60.0/40.0) A1 1000 11
R-401A zeotrope R-22/152a/124 (53.0/13.0/34.0) A1 1000 6.6
R-401B zeotrope R-22/152a/124 (61.0/11.0/28.0) A1 1000 7.2
R-401C zeotrope R-22/152a/124 (33.0/15.0/52.0) A1 1000 5.2
R-402A zeotrope R-125/290/22 (60.0/2.0/38.0) A1 1000 17

232 2022 CALIFORNIA MECHANICAL CODE

TABLE 1102.3 (continued) REFRIGERANT GROUPS, PROPERTIES, AND ALLOWABLE QUANTITIES 8

REFRIGERATION

[ASHRAE 34: TABLE 4-1, TABLE 4-2]
REFRIGERANT CHEMICAL FORMULA CHEMICAL NAME1
(COMPOSITION FOR BLENDS)		 SAFETY
GROUP7		 OEL2
(ppm)		 POUNDS PER 1000
CUBIC FEET OF SPACE
R-402B zeotrope R-125/290/22 (38.0/2.0/60.0) A1 1000 15
R-403A zeotrope R-290/22/218 (5.0/75.0/20.0) A2 1000 7.6
R-403B zeotrope R-290/22/218 (5.0/56.0/39.0) A1 1000 18
R-404A zeotrope R-125/143a/134a (44.0/52.0/4.0) A1 1000 31
R-405A zeotrope R-22/152a/142b/C318 (45.0/7.0/5.5/42.5) –– 1000 16
R-406A zeotrope R-22/600a/142b (55.0/4.0/41.0) A2 1000 4.7
R-407A zeotrope R-32/125/134a (20.0/40.0/40.0) A1 1000 19
R-407B zeotrope R-32/125/134a (10.0/70.0/20.0) A1 1000 21
R-407C zeotrope R-32/125/134a (23.0/25.0/52.0) A1 1000 18
R-407D zeotrope R-32/125/134a (15.0/15.0/70.0) A1 1000 16
R-407E zeotrope R-32/125/134a (25.0/15.0/60.0) A1 1000 17
R-407F zeotrope R-32/125/134a (30.0/30.0/40.0) A1 1000 20
R-407G zeotrope R-32/125/134a (2.5/2.5/95.0) A1 1000 13
R-407H zeotrope R-32/125/134a (32.5/15.0/52.5) A1 1000 19
R-407I zeotrope R-32/125/124a (19.5/8.5/72.0) A1 1000 16.0
R-408A zeotrope R-125/143a/22 (7.0/46.0/47.0) A1 1000 21
R-409A zeotrope R-22/124/142b (60.0/25.0/15.0) A1 1000 7.1
R-409B zeotrope R-22/124/142b (65.0/25.0/10.0) A1 1000 7.3
R-410A zeotrope R-32/125 (50.0/50.0) A1 1000 26
R-410B zeotrope R-32/125 (45.0/55.0) A1 –– 27
R-411A6 zeotrope R-1270/22/152a (1.5/87.5/11.0) A2 990 2.9
R-411B6 zeotrope R-1270/22/152a (3.0/94.0/3.0) A2 980 2.8
R-412A zeotrope R-22/218/142b (70.0/5.0/25.0) A2 1000 5.1
R-413A zeotrope R-218/134a/600a (9.0/88.0/3.0) A2 1000 5.8
R-414A zeotrope R-22/124/600a/142b (51.0/28.5/4.0/16.5) A1 1000 6.4
R-414B zeotrope R-22/124/600a/142b (50.0/39.0/1.5/9.5) A1 1000 6.0
R-415A zeotrope R-22/152a (82.0/18.0) A2 1000 2.9
R-415B zeotrope R-22/152a (25.0/75.0) A2 1000 2.1
R-416A6 zeotrope R-134a/124/600 (59.0/39.5/1.5) A1 1000 3.9
R-417A6 zeotrope R-125/134a/600 (46.6/50.0/3.4) A1 1000 3.5
R-417B zeotrope R-125/134a/600 (79.0/18.3/2.7) A1 1000 4.3
R-417C zeotrope R-125/134a/600 (19.5/78.8/1.7) A1 1000 5.4
R-418A zeotrope R-290/22/152a (1.5/96.0/2.5) A2 1000 4.8
R-419A zeotrope R-125/134a/E170 (77.0/19.0/4.0) A2 1000 4.2
R-419B zeotrope R-125/134a/E170 (48.5/48.0/3.5) A2 1000 4.6
R-420A zeotrope R-134a/142b (88.0/12.0) A1 1000 12
R-421A zeotrope R-125/134a (58.0/42.0) A1 1000 17
R-421B zeotrope R-125/134a (85.0/15.0) A1 1000 21
R-422A zeotrope R-125/134a/600a (85.1/11.5/3.4) A1 1000 18
R-422B zeotrope R-125/134a/600a (55.0/42.0/3.0) A1 1000 16
R-422C zeotrope R-125/134a/600a (82.0/15.0/3.0) A1 1000 18
R-422D zeotrope R-125/134a/600a (65.1/31.5/3.4) A1 1000 16
R-422E zeotrope R-125/134a/600a (58.0/39.3/2.7) A1 1000 16
R-423A zeotrope R-134a/227ea (52.5/47.5) A1 1000 19
R-424A6 zeotrope R-125/134a/600a/600/601a
(50.5/47.0/0.9/1.0/0.6)		 A1 970 6.2
R-425A zeotrope R-32/134a/227ea (18.5/69.5/12.0) A1 1000 16

2022 CALIFORNIA MECHANICAL CODE 233

REFRIGERATION

TABLE 1102.3 (continued) REFRIGERANT GROUPS, PROPERTIES, AND ALLOWABLE QUANTITIES 8

[ASHRAE 34: TABLE 4-1, TABLE 4-2]
REFRIGERANT CHEMICAL FORMULA CHEMICAL NAME1
(COMPOSITION FOR BLENDS)		 SAFETY
GROUP7		 OEL2
(ppm)		 POUNDS PER 1000
CUBIC FEET OF SPACE
R-426A6 zeotrope R-125/134a/600/601a (5.1/93.0/1.3/0.6) A1 990 5.2
R427A zeotrope R-32/125/143a/134a (15.0/25.0/10.0/50.0) A1 1000 18
R428A zeotrope R-125/143a/290/600a (77.5/20.0/0.6/1.9) A1 1000 23
R-429A zeotrope R-E170/152a/600a (60.0/10.0/30.0) A3 1000 0.81
R-430A zeotrope R-152a/600a (76.0/24.0) A3 1000 1.3
R-431A zeotrope R-290/152a (71.0/29.0) A3 1000 0.69
R-432A zeotrope R-1270/E170 (80.0/20.0) A3 700 0.13
R-433A zeotrope R-1270/290 (30.0/70.0) A3 880 0.34
R-433B zeotrope R-1270/290 (5.0/95.0) A3 950 0.51
R-433C zeotrope R-1270/290 (25.0/75.0) A3 790 0.41
R-434A zeotrope R-125/143a/134a/600a (63.2/18.0/16.0/2.8) A1 1000 20
R-435A zeotrope R-E170/152a (80.0/20.0) A3 1000 1.1
R-436A zeotrope R-290/600a (56.0/44.0) A3 1000 0.50
R-436B zeotrope R-290/600a (52.0/48.0) A3 1000 0.51
R-437A zeotrope R-125/134a/600/601 (19.5/78.5/1.4/0.6) A1 990 5.0
R-438A zeotrope R-32/125/134a/600/601a
(8.5/45.0/44.2/1.7/0.6)		 A1 990 4.9
R-439A zeotrope R-32/125/600a (50.0/47.0/3.0) A2 990 4.7
R-440A zeotrope R-290/134a/152a (0.6/1.6/97.8) A2 1000 1.9
R-441A zeotrope R-170/290/600a/600 (3.1/54.8/6.0/36.1) A3 1000 0.39
R-442A zeotrope R-32/125/134a/152a/227ea
(31.0/31.0/30.0/3.0/5.0)		 A1 1000 21
R-443A zeotrope R-1270/290/600a (55.0/40.0/5.0) A3 580 0.19
R-444A zeotrope R-32/152a/1234ze(E) (12.0/5.0/83.0) A2L 850 5.1
R-444B zeotrope R-32/152a/1234ze(E) (41.5/10.0/48.5) A2L 890 4.3
R-445A zeotrope R-744/134a/1234ze (E) (6.0/9.0/85.0) A2L 930 4.2
R-446A zeotrope R-32/1234ze(E)/600 (68.0/29.0/3.0) A2L 960 2.5
R-447A zeotrope R-32/125/1234ze(E) (68.0/3.5/28.5) A2L 900 2.6
R-447B zeotrope R-32/125/1234ze(E) (68.0/8.0/24.0) A2L 970 23
R-448A zeotrope R-32/125/1234yf/134a/1234ze(E)
(26.0/26.0/20.0/21.0/7.0)		 A1 890 24
R-449A zeotrope R-32 /125 /1234yf /134a
(24.3/24.7/25.3/25.7)		 A1 830 23
R-449B zeotrope R-32/125/1234yf/134a
(25.2/24.3/23.2/27.3)		 A1 850 23
R-449C zeotrope R-32/125/1234yf/134a
(20.0/20.0/31.0/29.0)		 A1 800 23
R-450A zeotrope R-134a/1234ze(E) (42.0/58.0) A1 880 20
R-451A zeotrope R-1234yf/134a (89.8/10.2) A2L 520 5.3
R-451B zeotrope R-1234yf/134a (88.8/11.2) A2L 530 5.3
R-452A zeotrope R-32/125/1234yf (11.0/59.0/30.0) A1 780 27
R-452B zeotrope R-32/125/1234yf (67.0/7.0/26.0) A2L 870 23
R-452C zeotrope R-32/125/1234yf (12.5/61.0/26.5) A1 800 27
R-453A zeotrope R-32/125/134a/227ea/600/601a
(20.0/20.0/53.8/5.0/0.6/0.6)		 A1 1000 7.8
R-454A zeotrope R-32/1234yf (35.0/65.0) A2L 690 28
R-454B zeotrope R-32/1234yf (68.9/31.1) A2L 850 22
R-454C zeotrope R-32/1234yf (21.5/78.5) A2L 620 29

234 2022 CALIFORNIA MECHANICAL CODE

TABLE 1102.3 (continued) REFRIGERANT GROUPS, PROPERTIES, AND ALLOWABLE QUANTITIES 8

REFRIGERATION

[ASHRAE 34: TABLE 4-1, TABLE 4-2]
REFRIGERANT CHEMICAL FORMULA CHEMICAL NAME1
(COMPOSITION FOR BLENDS)		 SAFETY
GROUP7		 OEL2
(ppm)		 POUNDS PER 1000
CUBIC FEET OF SPACE
R-455A zeotrope R-744/32/1234yf (3.0/21.5/75.5) A2L 650 23
R-456A zeotrope R-32/134a/1234ze(E) (6.0/45.0/49.0) A1 900 20
R-457A zeotrope R-32/1234yf/152a (18.0/70.0/12.0) A2L 650 25
R-458A zeotrope R-32/125/134a/227ea/236fa
(20.5/4.0/61.4/13.5/0.6)		 A1 1000 18
R-459A zeotrope R-32/1234yf/1234ze(E)
(68.0/26.0/6.0)		 A2L 870 23
R-459B zeotrope R-32/1234yf/1234ze(E)
(21.0/69.0/10.0)		 A2L 640 30
R-460A zeotrope R-32/125/134a/1234ze(E)
(12.0/52.0/14.0/22.0)		 A1 650 24
R-460B zeotrope R-32/125/134a/1234ze(E)
(28.0/25.0/20.0/27.0)		 A1 950 25
R-460C zeotrope R-32/125/134a/1234ze(E)
(2.5/2.5/46.0/49.0)		 A1 900 20.0
R-461A zeotrope R-125/143a/134a/227ea/600a
(55.0/5.0/32.0/5.0/3.0)		 A1 1000 17
R-462A zeotrope R-32/125/143a/134a/600
(9.0/42.0/2.0/44.0/3.0)		 A2 1000 3.9
R-463A zeotrope R-744/32/125/1234yf/134a
(6.0/36.0/30.0/14.0/14.0)		 A1 990 19
R-464A zeotrope R-32/125/1234ze(E)/227ea
(27.0/27.0/40.0/6.0)		 A1 930 27.0
R-465A zeotrope R-32/290/1234yf
(21.0/7.9/71.1)		 A2 660 2.5
R-500 azeotrope3 R-12/152a (73.8/26.2) A1 1000 7.6
R-501 azeotrope3 R-22/12 (75.0/25.0)4 A1 1000 13
R-502 azeotrope3 R-22/115 (48.8/51.2) A1 1000 21
R-503 azeotrope3 R-23/13 (40.1/59.9) –– 1000 ––
R-504 azeotrope3 R-32/115 (48.2/51.8) –– 1000 28
R-505 azeotrope3 R-12/31 (78.0/22.0)4 –– –– ––
R-506 azeotrope3 R-31/114 (55.1/44.9) –– –– ––
R-507A5 azeotrope3 R-125/143a (50.0/50.0) A1 1000 32
R-508A5 azeotrope3 R-23/116 (39.0/61.0) A1 1000 14
R-508B azeotrope3 R-23/116 (46.0/54.0) A1 1000 13
R-509A5 azeotrope3 R-22/218 (44.0/56.0) A1 1000 24
R-510A azeotrope3 R-E170/600a (88.0/12.0) A3 1000 0.87
R-511A azeotrope3 R-290/E170 (95.0/5.0) A3 1000 0.59
R-512A azeotrope3 R-134a/152a (5.0/95.0) A2 1000 1.9
R-513A azeotrope3 R-1234yf/134a (56.0/44.0) A1 650 20
R-513B azeotrope3 R-1234yf/134a (58.5/41.5) A1 640 21
R-514A azeotrope3 R-1336mzz(Z)/1130 (E) (74.7/25.3) B1 320 0.86
R-515A azeotrope3 R-1234ze(E)/227ea (88.0/12.0) A1 810 19
R-516A azeotrope3 R-1234yf/134a/152a (77.5/8.5/14.0) A2L 590 7.0
R-600 CH3CH2CH2CH3 Butane A3 1000 0.15
R-600a CH(CH3)2CH3 2-methylpropane (isobutene) A3 1000 0.59
R-601 CH3CH2CH2CH2 CH3 Pentane A3 600 0.18

2022 CALIFORNIA MECHANICAL CODE 235

REFRIGERATION

TABLE 1102.3 (continued) REFRIGERANT GROUPS, PROPERTIES, AND ALLOWABLE QUANTITIES 8

[ASHRAE 34: TABLE 4-1, TABLE 4-2]
REFRIGERANT CHEMICAL FORMULA CHEMICAL NAME1
(COMPOSITION FOR BLENDS)		 SAFETY
GROUP7		 OEL2
(ppm)		 POUNDS PER 1000
CUBIC FEET OF SPACE
R-601a (CH3)2CHCH2CH3 2-methylbutane (isopentane) A3 600 0.18
R-610 CH3CH2OCH2CH3 Ethoxyethane (ethyl ether) –– 400 ––
R-611 HCOOCH3 Methyl formate B2 100 ––
R-620 –– (Reserved for future assignment) –– –– ––
R-630 CH3NH2 Methanamine (methyl amine) –– –– ––
R-631 CH3CH2(NH2) Ethanamine (ethyl amine) –– –– ––
R-702 H2 Hydrogen A3 –– ––
R-704 He Helium A1 –– ––
R-717 NH3 Ammonia B2L 25 0.014
R-718 H2O Water A1 –– ––
R-720 Ne Neon A1 –– ––
R-728 N2 Nitrogen A1 –– ––
R-732 O2 Oxygen –– –– ––
R-740 Ar Argon A1 –– ––
R-744 CO2 Carbon dioxide A1 5000 3.4
R-744A N2O Nitrous oxide –– –– ––
R-764 SO2 Sulfur dioxide B1 –– ––
R-1130(E) CHCl=CHCl Trans-1,2-dichloroethene B1 200 0.25
R-1132a CF2 = CH2 1, 1-difluoroethylene A2 500 2.0
R-1150 CH2=CH2 Ethene (ethylene) A3 200 ––
R-1224yd(Z) CF3CF=CHCl (Z)-1-chloro-2,3,3,3-tetrafluoropropen A1 1000 23
R-1233zd(E) CF3CH=CHCl Trans-1-chloro-3,3,3-trifluoro-1- propene A1 800 5.3
R-1234yf CF3CF=CH2 2, 3, 3, 3-tetrafluoro-1-propene A2L 500 4.7
R-1234ze(E) CF3CH=CHF Trans-1,3,3,3- tetrafluoro-1-propene A2L 800 4.7
R-1270 CH3CH=CH2 Propene (propylene) A3 500 0.11
R-1336mzz(Z) CF3CHCHCF3 Cis-1,1,1,4,4,4-hexaflouro-2-butene A1 500 5.4

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 Refrigerant flammability classification of Class 2L shall comply with the requirements for flammability classification of Class 2. 8 In accordance with Section 1102.2, 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.

236 2022 CALIFORNIA MECHANICAL CODE

REFRIGERATION

TABLE 1104.1 PERMISSIBLE REFRIGERATION SYSTEMS 1

OCCUPANCY GROUP3 HIGH-PROBABILITY SYSTEM LOW PROBABILITY SYSTEM MACHINERY ROOM
A-1 Group A1 only Any Any
A-2 Group A1 only Any Any
A-3 Group A1 only Any Any
A-4 Group A1 only Any Any
B roup A12 only Any Any
E Group A1 only Any Any
F-1 Group A12 only Any Any
F-2 Any2 Any Any
H-1 Any Any Any
H-2 Any Any Any
H-3 Any Any Any
H-4 Group A1 only Any Any
H-5 Group A1 only Any Any
I-1 None Any Any
I-2 Group A1 only Any Any
[OSHPD 1, 1R, 2, 3, 4 & 5] I-2.1 Group A1 only Any Any
I-3 None Any Any
I-4 Group A1 only Any Any
M Group A12 only Any Any
R-1 Group A1 only Any Any
R-2 Group A1 only Any Any
R-3 Group A1 only Any Any
R-4 Group A1 only Any Any
S-1 Group A12 only Any Any
S-2 Any2 Any Any
U Any Any Any

Notes: 1 See Section 1104.0. 2 A refrigerant shall be permitted to be used within a high-probability system where the room or space is in accordance with Section 1104.4. 3 Occupancy classifications are defined in the building code.

2022 CALIFORNIA MECHANICAL CODE 237

238 2022 CALIFORNIA MECHANICAL CODE

CALIFORNIA MECHANICAL CODE – MATRIX ADOPTION TABLE

Get a plain-English answer with a citation back to this text.

Ask AI about this code
Export this section
▸Contents — California Mechanical Code (Title 24, Part 4)
California Mechanical Code (Title 24, Part 4)
  1. Chapter 1 — GENERAL CODE PROVISIONS
  2. Chapter 2 — DEFINITIONS
  3. Chapter 3 — GENERAL REGULATIONS
  4. Chapter 4 — VENTILATION AIR
  5. Chapter 5 — EXHAUST SYSTEMS
  6. Chapter 6 — DUCT SYSTEMS
  7. Chapter 7 — COMBUSTION AIR
  8. Chapter 8 — CHIMNEYS AND VENTS
  9. Chapter 9 — INSTALLATION OF SPECIFIC APPLIANCES
  10. Chapter 10 — BOILERS AND PRESSURE VESSELS
  11. ▸Chapter 11 — REFRIGERATION
    Overview
    1. 1101.1 Applicability. Part I governs the design, installation,
    2. 1101.2 Equipment. Equipment for refrigerant recovery,
    3. 1102.1 General. Refrigeration systems using a refrigerant
    4. 1102.2 Ammonia Refrigeration Systems. Refrigeration
    5. 1102.3 Refrigerants. The refrigerant used shall be of a type
    6. 1103.1 Classification of Refrigerants. Refrigerants shall
    7. 1103.2 Classification of Refrigeration Systems.
    8. 1103.3 Higher Flammability Refrigerants. Group A3
    9. 1104.1 System Selection. Refrigeration systems shall be
    10. 1104.2 Refrigerant Concentration Limit. The concentration of r…
    11. 1104.3 Institutional Occupancies. The RCL value
    12. 1104.4 Industrial Occupancies and Refrigerated
    13. 1104.5 Flammable Refrigerants. The total of Group A2,
    14. 1104.6 Applications for Human Comfort and for Non-
    15. 1104.7 Refrigerant Type and Purity. Refrigerants shall
    16. 1104.8 Changing Refrigerants. A change in the type of
    17. 1105.1 Human Comfort. Cooling systems used for human
    18. 1105.2 Supports and Anchorage. Supports and anchorage for refr…
    19. 1105.3 Access. An unobstructed readily accessible opening and …
    20. 1105.4 Illumination and Service Receptacles. In addition to th…
    21. 1105.5 Ventilation of Rooms Containing Condensing
    22. 1105.6 Prohibited Locations. Refrigeration systems or
    23. 1105.7 Condensate. Condensate from air-cooling coils
    24. 1105.8 Defrost. Where defrost cycles are required for portions…
    25. 1105.9 Overflows. Where condensate or defrost liquids are
    26. 1105.10 Condensate, Defrost, and Overflow Dis-
    27. 1105.11 Refrigerant Port Protection. Air conditioning
    28. 1105.12 Storage. Refrigerants and refrigerant oils not
    29. 1106.1 Where Required. Refrigeration systems shall be
    30. 1106.2 Refrigeration Machinery Room, General
    31. 1106.4 Natural Ventilation. Where a refrigerating system
    32. 1106.5 Combustion Air. No open flames that use combustion air …
    33. 1106.6 Airflow. There shall be no airflow to or from an occupi…
    34. 1106.7 Ventilation Intake. Makeup air intakes to replace
    35. 1106.3 Normal Operation. A part of the refrigeration
    36. 1106.8 Maximum Temperature. Ventilation or mechanical cooling …
    37. 1106.9 Refrigerant Parts in Air Duct. Joints and refrigerant-c…
    38. 1106.10 Dimensions. Refrigeration machinery rooms shall
    39. 1106.11 Restricted Access. Access to the refrigeration
    40. 1106.12 Exits. Exits shall comply with the building code for
    41. 1107.1 General. In cases specified in the rules of Section
    42. 1108.1 General. Equipment, piping, ducts, vents, or similar
    43. 1108.2 Electrical. Electrical equipment and installations
    44. 1108.3 Emergency Shut-off. A clearly identified emergency shut…
    45. 1108.4 Installation, Maintenance, and Testing. Detection and a…
    46. 1108.5 Emergency Pressure Control System. Where
    47. 1109.1 Materials. Materials used in the construction and
    48. 1109.2 Joints. Iron or steel pipe joints shall be of approved
    49. 1109.3 Penetration of Piping. Refrigerant piping shall not
    50. 1109.4 Location of Refrigeration Piping. Refrigerant
    51. 1109.5 Underground Piping. Refrigerant piping placed
    52. 1109.6 Support. In addition to the requirements of Section
    53. 1109.7 Pipe Enclosure. Refrigerant piping and tubing
    54. 1109.8 Visual Inspection. Refrigerant piping and joints
    55. 1109.9 Condensation. Piping and fittings that convey
    56. 1109.10 Identification. Piping shall be in accordance with
    57. 1110.1 More than 6.6 Pounds of Refrigerant. Systems
    58. 1110.2 More than 110 Pounds of Refrigerant. Systems
    59. 1110.3 Support. Stop valves installed in copper refrigerant
    60. 1110.4 Access. Stop valves required by Section 1110.0 shall
    61. 1110.5 Identification. Stop valves shall be identified by tagg…
    62. 1111.1 Where Required. Pressure-limiting devices complying wit…
    63. 1111.2 Setting. Pressure limiting devices shall be set in
    64. 1111.3 Location. Stop valves shall not be installed between
    65. 1111.4 Emergency Stop. Activation of a pressure-limiting
    66. 1112.1 General. Refrigeration systems shall be protected by
    67. 1112.2 Positive Displacement Compressor. A positive
    68. 1112.3 Liquid-Containing Portions of Systems. Liquid-containin…
    69. 1112.4 Evaporators. Heat exchanger coils located downstream, o…
    70. 1112.5 Hydrostatic Expansion. Pressure rise resulting
    71. 1112.6 Actuation. Pressure-relief devices shall be directpress…
    72. 1112.7 Stop Valves Prohibited. Stop valves shall not be
    73. 1112.8 Location. Pressure-relief devices shall be connected
    74. 1112.9 Materials. The seats and discs of pressure-relief
    75. 1112.10 Pressure-Relief Device Settings. Pressurerelief valves…
    76. 1112.11 Discharge from Pressure-Relief Devices.
    77. 1112.12 Discharge Piping. The piping used for pressurerelief d…
    78. 1112.13 Rating of Pressure-Relief Device. The rated
    79. 1112.14 Rating of Rupture Members and Fusible
    80. 1113.1 General. Pressure vessels shall be provided with
    81. 1113.2 Type of Protection. Pressure vessels with an internal g…
    82. 1113.3 Discharging into Lowside of System. For pressure-relief…
    83. 1113.4 Parallel Pressure-Relief Devices. Two or more
    84. 1113.5 Discharge Capacity. The minimum required discharge capa…
    85. 1113.6 Three-Way Valve. Pressure vessels of 10 cubic feet
    86. 1114.1 General. Systems containing other than Group A1 or
    87. 1114.2 Design Requirements. Flaring devices shall be
    88. 1114.3 Testing. Flaring systems shall be tested to demonstrate…
    89. 1115.1 General. In addition to labels required elsewhere in
    90. 1115.2 Volume and Type. A condenser, receiver, absorber,
    91. 1115.3 Permanent Sign. In a refrigeration machinery room
    92. 1115.4 Marking of Pressure-Relief Devices. Pressurerelief valv…
    93. 1116.1 Factory Tests. Refrigerant-containing parts of unit
    94. 1116.2 Field Tests. Refrigerant-containing parts of a system t…
    95. 1116.3 Test Gases. Tests shall be performed with dry nitrogen …
    96. 1116.4 Declaration. A dated declaration of test shall be provi…
    97. 1116.5 Brine Systems. Brine-containing portions of a system sh…
    98. 1117.1 Inside Dimensions 6 Inches or Less. Pressure
    99. 1117.2 Inside Dimensions More than 6 Inches. Pressure vessels …
    100. 1117.3 Pressure Vessels for 15 psig or Less. Pressure
    101. 1118.1 General. Refrigeration systems shall be operated and
    102. 1119.1 Applicability. Cooling towers, evaporative condensers, …
    103. 1120.1 General. Cooling towers, evaporative condensers,
    104. 1121.1 General. Drains, overflows, and blow-down provisions sh…
    105. 1122.1 General. Chemical treatment systems shall comply
    106. 1122.2 Automated Control of Cycles of Concentra-
    107. 1123.1 General. Cooling towers, evaporative condensers,
    108. 1124.1 General. Electrical systems shall be in accordance
    109. 1125.1 General. Equipment containing refrigerants as a part
    110. 1126.1 General. Cooling towers, evaporative condensers,
  12. Chapter 12 — HYDRONICS
  13. Chapter 13 — FUEL GAS PIPING
  14. Chapter 14 — PROCESS PIPING
  15. Chapter 15 — SOLAR ENERGY SYSTEMS
  16. Chapter 16 — STATIONARY POWER PLANTS
  17. Chapter 17 — REFERENCED STANDARDS
  18. Appendix A — RESIDENTIAL PLAN EXAMINER REVIEW FORM FOR HVAC SY…
  19. Appendix B — PROCEDURES TO BE FOLLOWED TO PLACE GAS EQUIPMENT …
  20. Appendix C — INSTALLATION AND TESTING OF OIL (LIQUID) FUEL-FIR…
  21. Appendix D — FUEL SUPPLY: MANUFACTURED/MOBILE HOME PARKS AND R…
  22. Appendix E — SUSTAINABLE PRACTICES
  23. Appendix F — GEOTHERMAL ENERGY SYSTEMS
  24. Appendix G — SIZING OF VENTING SYSTEMS AND OUTDOOR COMBUSTION …
  25. Appendix H — EXAMPLE CALCULATION OF OUTDOOR AIR RATE

GoCodebook provides public access, search, citation, multilingual explanation, and practical interpretation of legally adopted building regulations. It is not a substitute for the official ICC or California code publications.