N.Y.C. Admin. Code § MC 1103: Section MC 1103: Refrigeration System Classification

1103.1 Refrigerant classification.

Refrigerants shall be classified in accordance with ASHRAE 34 as listed in Table 1103.1.

Table 1103.1 Refrigerant Data and Safety Classifications a

Refrigerant Number

Chemical Name

Chemical Formula

OEL

d

ppm v/v

Safety

c

 Group

RCL

(ppm v/v)

(g/m

3

)

Ib/Mcf

Methane Series

11

b

trichlorofluoromethane

CCl3F

C1000

A1

1,100

6.2

.39

12

b

dichlorodifluoromethane

CCl2F2

1,000

A1

18,000

90

5.6

13

b

chlorotrifluoromethane

CClF3

1,000

A1

-

-

-

13B1

b

bromotrifluoromethane

CBrF3

1,000

A1

-

-

-

14

tetrafluoromethane (carbon tetrafluoride)

CF4

1,000

A1

110,000

400

25

21

dichlorofluoromethane

CHCl2F

-

B1

-

-

-

22

chlorodifluoromethane

CHClF2

1,000

A1

59,000

210

13

23

trifluoromethane

CHF3

1,000

A1

41,000

120

7.3

30

dichloromethane (methylene chloride)

CH2Cl2

-

B2

-

-

-

32

difluoromethane (methylene fluoride)

CH2F2

1,000

A2L

36,000

77

4.8

40

chloromethane (methyl chloride)

CH3Cl

-

B2

-

-

-

50

methane

CH4

1,000

A3

-

-

-

Ethane Series

113

b

1,1,2-trichloro-1,2,2-trifluoroethane

CCl2FCClF2

1,000

A1

2,600

20

1.2

114

b

1,2-dichloro-1,1,2,2- tetrafluoroethane

CClF2CClF2

1,000

A1

20,000

140

8.7

115

b

chloropentafluoroethane

CClF2CF3

1,000

A1

120,000

760

47

116

hexafluoroethane

CF3CF3

1,000

A1

97,000

550

34

123

2,2-dichloro-1,1,1,-trifluoroethane

CHCl2CF3

50

B1

9,100

57

3.5

124

2-chloro-1,1,1,2-tetrafluoroethane

CHClFCF3

1,000

A1

10,000

56

3.5

125

pentafluoroethane

CHF2CF3

1,000

A1

75,000

370

23

134

a

1,1,1,2-tetrafluoroethane

CH2FCF3

1,000

A1

50,000

210

13

142

b

1-chloro-1, 1-difluoroethane

CH3CClF2

1,000

A2

20,000

83

5.1

143

a

1,1,1-trifluoroethane

CH3CF3

1,000

A2L

21,000

70

4.5

152

a

1,1-difluoroethane

CH3CHF2

1,000

A2

12,000

32

2.0

170

ethane

CH3CH3

1,000

A3

7,000

8.7

0.54

Ethers

E170

methoxymethane (dimethyl ether)

CH3OCH3

1,000

A3

8,500

16

1.0

Propane

218

octafluoropropane

CF3,CF2CF3

1,000

A1

90,000

690

43

227

ea

1,1,1,2,3,3,3-heptafluoropropane

CF3CHFCF3

1,000

A1

84,000

580

36

236

fa

1,1,1,3,3,3-hexafluoropropane

CF3CH2CF3

1,000

A1

55,000

340

21

245

fa

1,1,1,3,3-pentafluoropropane

CHF2CH2CF3

300

B1

34,000

190

12

290

propane

CH3CH2CH3

1,000

A3

5,300

9.5

0.56

Cyclic Organic Compounds

C318

octafluorocyclobutane

-(CF2)4-

1,000

A1

80,000

660

41

Miscellaneous Organic Compounds Hydrocarbons

600

butane

CH3CH2CH2CH3

1,000

A3

-

-

.51

600

a

2-methylpropane (isobutane)

CH(CH3)2CH3

1,000

A3

4,000

9.6

.59

601

pentane

CH3CH2CH2CH2CH3

600

A3

1,000

2.9

.18

601

a

2-methylbutane (isopentane)

(CH3)2CHCH2CH3

600

A3

1,000

2.9

.18

611

methyl formate

HCOOCH3

100

B2

-

-

-

Inorganic Compounds

702

hydrogen

H2

-

A3

-

-

-

704

helium

He

-

A1

-

-

-

717

ammonia

NH3

25

B2L

320

0.22

.014

718

water

H2O

-

A1

-

-

-

720

neon

Ne

-

A1

-

-

-

728

nitrogen

N2

-

A1

-

-

-

740

argon

Ar

-

A1

-

-

-

744

carbon dioxide

CO2

5000

A1

40,000

72

4.5

764

sulfur dioxide

SO2

-

B1

-

-

-

Unsaturated Organic Compounds

1150

ethene (ethylene)

CH2=CH2

200

A3

-

-

-

1234yf

2,3,3,3-tetrafluoro-1-propene

CF3CF=CH2

500

A2L

16,000

75

4.7

1234ze(E)

trans-1,3,3,3-tetrafluoro-1-propene

CF3CH=CHF

800

A2L

16,000

75

4.7

1270

propene (propylene)

CH3CH=CH2

500

A3

1,000

1.7

.1

Zeotropes (Refrigerant Blends)

400 (50%/50%)

b

R-12/114 (50.0/50.0)

1,000

A1

28,000

160

10

400 (60%/40%)

b

R-12/114 (60.0/40.0)

1,000

A1

30,000

170

11

401A

R-22/152a/124 (53.0/13.0/34.0)

(±2.0/+0.5, -1.5;/±1.0)

1,000

A1

27,000

110

6.6

401B

R-22,/152a/124 (61.0/11.0/28.0)

(±2.0/+0.5, -1.5/±1.0)

1,000

A1

30,000

120

7.2

401C

R-22,/152a/124 (33.0/15.0/52.0)

(±2.0/+0.5, -1.5/±1.0)

1,000

A1

20,000

84

5.2

402A

R-125/290/22 (60.0/2.0/38.0)

(±2.0/+0.1, -1.0/±2.0)

1,000

A1

33,000

140

8.5

402B

R-125/290/22 (38.0/2.0/60.0)

(±2.0/+0.1, -1.0/±2.0)

1,000

A1

63,000

240

15

403A

R-290/22/218 (5.0/75.0/20.0)

(+.2, -2.0/±2.0/±2.0)

1,000

A2

33,000

120

7.6

403B

R-290/22/218 (5.0/56.0/39.0)

(+.2, -2.0/±2.0/±2.0)

1,000

A1

70,000

290

18

404A

R-125/143a/134a (44.0/52.0/4.0)

(±2.0/±1.0/±2.0)

1,000

A1

130,000

500

31

406A

R-22/600a/142b (55.0/4.0/41.0)

(±2.0/±1.0/±1.0)

1,000

A2

21,000

25

4.7

407A

R-32/125/134a (20.0/40.0/40.0)

(±2.0/±2.0/±2.0)

1,000

A1

83,000

300

19

407B

R-32/125/134a (10.0/70.0/20.0)

(±2.0/±2.0/±2.0)

1,000

A1

79,000

330

21

407C

R-32/125/134a (23.0/25.0/52.0)

(±2.0/±2.0/±2.0)

1,000

A1

81,000

290

18

407D

R-32/125/134a (15.0/15.0/70.0)

(±2.0/±2.0/±2.0)

1,000

A1

68,000

250

16

407E

R-32/125/134a (25.0/15.0/60.0)

(±2.0/±2.0/±2.0)

1,000

A1

80,000

280

17

407F

R-32/125/134a (30.0/30.0/40.0)

(±2.0/±2.0/±2.0)

1,000

A1

95,000

320

20

408A

R-125/143a/22 (7.0/46.0/47.0)

(±2.0/±1.0/±2.0)

1,000

A1

95,000

110

21

409A

R-22/124/142b (60.0/25.0/15.0)

(±2.0/±2.0/±1.0)

1,000

A1

29,000

120

7.1

409B

R-22/124/142b (65.0/25.0/10.0)

(±2.0/±2.0/±1.0)

1,000

A1

30,000

390

7.3

410A

R-32/125 (50.0/50.0)

(+0.5, -1.5/+1.5, -0.5)

1,000

A1

140,000

420

26

410B

R-32/125 (45.0/55.0)

(±1.0/±1.0)

1,000

A1

140,000

430

27

411A

R-1270/22/152a(1.5/87.5/11.0)

(+0.0, -1.0/+2.0,-0.0/+0.0, -1.0)

990

A2

14,000

46

2.9

411B

R-1270/22/152a(3.0/94.0/3.0)

(+0.0, -1.0/+2.0,-0.0/+0.0, -1.0)

980

A2

13,000

45

2.8

412A

R-22/218/142b (70.0/5.0/25.0)

(±2.0/±2.0/±1.0)

1,000

A2

22,000

82

5.1

413A

R-218/134a/600a (9.0/88.0/3.0)

±1.0/±2.0/+0.0,-1.0)

1,000

A2

22,000

95

5.8

414A

R-22/124/600a/142b(51.0/28.5/4.0/16.5)

(±2.0/±2.0/±0.5 /+0.5, -1.0)

1,000

A1

26,000

100

6.4

414B

R-22/124/600a/142b(50.0/39.0/1.5/9.5)

(±2.0/±2.0/±0.5 /+0.5, -1.0)

1,000

A1

23,000

95

6.0

415A

R-22/152a (82.0/18.0)

(±1.0/±1.0)

1,000

A2

57,000

190

12

415B

R-22/152a (25.0/75.0)

(±1.0/±1.0)

1,000

A2

52,000

120

9.3

416A

R-134a/124/600(59.0/39.5/1.5)

(+0.5, -1.0/+1.0,-0.5/+1.0, -0.2)

1,000

A1

14,000

62

3.9

417A

R-125/134a/600 (46.6/50.0/3.4)

(±1.1/±1.0/+0.1,-0.4)

1,000

A1

13,000

56

3.5

417B

R-125/134a/600 (79.0/18.3/2.7)

(±1.0/±1.0/+0.1,-0.5)

1,000

A1

15,000

70

4.3

418A

R-290/22/152a (1.5/96.0/2.5

(±0.5/±1.0/±0.5)

1,000

A2

59,000

200

13

419A

R-125/134a/E170 (77.0/19.0/4.0)

(1.0/1.0/1.0)

1,000

A2

70,000

310

19

420A

R-134a/142b (88.0/12.0)

(+1.0,-0.0/+0.0,-1.0)

1,000

A1

45,000

190

12

421A

R-125/134a (58.0/42.0)

(±1.0/±1.0)

1,000

A1

61,000

280

17

421B

R-125/134a (85.0/15.0)

(±1.0/±1.0)

1,000

A1

69,000

330

21

422A

R-125/134a/600a (55.0/42.0/3.0)

(±1.0/±1.0/+0.1,-0.4)

1,000

A1

63,000

290

18

422B

R-125/134a/600a (82.0/15.0/3.0)

(±1.0/±1.0/+0.1,-0.5)

1,000

A1

56,000

250

16

422C

R-125/134a/600a (82.0/15.0/3.0)

(±1.0/±1.0/+0.1,-0.5)

1,000

A1

62,000

290

18

422D

R-125/134a/600a(65.1/31.5/3.4)

(+0.9,-1.1/±1.0/+0.1,-0.4)

1,000

A1

58,000

260

16

423A

R-134a/227ea (52.5/47.5)

(±1.0/±1.0)

1,000

A1

59,000

310

19

424A

R-125/134a/600a/600/601a(50.5/47.0/0.9/1.0/0.6)

(±1.0/±1.0/+0.1,-0.2/+0.1, +0.2/+0.1,-0.2)

970

A1

23,000

100

6.2

425A

R-32/134a/227ea (18.5/69.5/12.0)

(±0.5/±0.5/±0.5)

1,000

A1

72,000

260

16

426A

R-125/134a/600/601a(5.1/93.0/1.3/0.6)

(±1.0/±1.0/+0.1,-0.2/+0.1, -0.2)

990

A1

20,000

83

5.2

427A

R-32/125/143a/134a(15.0/25.0/10.0/50.0)

(±2.0/±2.0/±2.0/;±2.0)

1,000

A1

79,000

290

18

428A

R-125/143a/290/600a(77.5/20.0/0.6/1.9)

(±1.0/±1.0/+0.1,-0.2/+0.1, -0.2)

1,000

A1

83,000

370

23

429A

R-E170/152a/600a(60.0/10.0/30.0)

(±1.0/±1.0/±1.0)

1,000

A3

6,300

13

.81

430A

R-152a/600a (76.0/24.0)

(±1.0/±1.0)

1,000

A3

8,000

21

1.3

431A

R-290/152a (71.0/29.0)

(±1.0/±1.0)

1,000

A3

5,500

11

.69

432A

R-1270/E170 (80.0/20.0)

(±1.0/±1.0)

710

A3

1,200

2.1

.13

433A

R-1270/290 (30.0/70.0)

(±1.0/±1.0)

880

A3

3,100

5.5

.34

433B

R-1270/290 (5.0/95.0)

(±1.0/±1.0)

950

A3

4,500

8.1

.51

433C

R-1270/290 (25.0/75.0)

(±1.0/±1.0)

790

A3

3,600

6.6

.41

434A

R-125/143a/134a/600a(63.2/18.0/16.0/2.8)

(±1.0/±1.0±1.0/+0.1,-0.2)

1,000

A1

73,000

320

20

435A

R-E170/152a (80.0/20.0)

(±1.0/±1.0)

1,000

A3

8,500

17

1.1

436A

R-290/600a (56.0/44.0)

(±1.0/±1.0)

1,000

A3

4,000

8.1

.5

436B

R-290/600a (52.0/48.0)

(±1.0/±1.0)

1,000

A3

4,000

8.1

.5

437A

R-125/134a/600/601(19.5/78.5/1.4/0.6)

(+0.5,-1.8/+1.5,-0.7/+0.1,-0.2/+0.1,-0.2)

990

A1

19,000

81

5.0

438A

R-32/125/134a/600/601a(8.5/45.0/44.2/1.7/0.6)

(+0.5,-1.5/±1.5/±1.5/+0.1,-0.2/+0.1,-0.2)

990

A1

20,000

79

4.9

439A

R-32/125/600a(50.0/47.0/3.0)

(±1.0/±1.0/±0.5)

990

A2

26,000

76

4.7

440A

R-290/134a/152a(0.6/1.6/97.8)

(±1.0/±0.6/±0.5)

1,000

A2

12,000

31

1.9

441A

R-179/290/600a/600(3.1/54.8/6.0/36.1)

(±0.3/±2.0/±0.6/±2.0)

1,000

A3

3,200

6.3

.39

Azeotropes (Refrigerant Blends)

500

b

R-12/152a (73.8/26.2)

-

1,000

A1

30,000

120

7.6

501

b

R-22/12 (75.0/25.0)

-

1,000

A1

54,000

210

13

502

b

R-22/115 (48.8/51.2)

-

1,000

A1

73,000

330

21

504

R-32/115 (48.2/51.8)

-

1,000

-

140,000

450

28

507A

R-125/143a (50.0/50.0)

-

1,000

A1

130,000

520

32

508A

R-23/116 (39.0/61.0)

-

1,000

A1

55,000

220

14

508B

R-23/116 (46.0/54.0)

-

1,000

A1

52,000

200

13

509A

R-22/218 (44.0/56.0)

-

1,000

A1

75,000

390

24

510A

R-E170/600a (88.0/12.0)

(±0.5/±0.5)

1,000

A3

7,300

14

.87

511A

R-290/E170 (95.0,5.0)

(±1.0/±1.0)

1,000

A3

5,300

9.5

.59

For SI: 1 pound = 0.454 kg, 1 cubic foot = 0.0283 m

3

.

a. Data based on ASHRAE 34 including Addenda a through o. For more complete data, see ASHRAE 34 and Addenda. Use of Addenda issued after Addendum o is subject to approval as set forth in Section 1102.2.

b. Class I ozone depleting refrigerant. Not permitted for new installations.

c. Refrigerants in Safety Group "A2L" shall comply with rules of the department. Refrigerants in Safety Group "B2L" shall comply with all applicable requirements for "B2" refrigerants.

d.

OCCUPATIONAL EXPOSURE LIMIT (OEL). The time-weighted average (TWA) concentration for a normal 8-hour workday and a 40-hour workweek to which nearly all workers can be repeatedly exposed without adverse effect, based on the OSHA PEL, ACGIH TLV-TWA, AIHA WEEL, or consistent value.

1103.2 Occupancy classification.

Locations of refrigerating systems are described by occupancy classifications that consider the ability of people to respond to potential exposure to refrigerants. Where equipment or appliances, other than piping, are located outside a building and within 20 feet (6096 mm) of any building opening, such equipment or appliances shall be governed by the occupancy classification of the building. Occupancy classifications of buildings shall be in accordance with the building classifications in the New York City Building Code.

1. Institutional occupancy shall include Occupancy Groups I-1, I-2, I-3 and I-4.

2. Public assembly occupancy shall include Occupancy Groups A-1, A-2, A-3, A-4, A-5 and E.

3. Residential occupancy shall include Occupancy Groups R-1, R-2 and R-3.

4. Commercial occupancy shall include Occupancy Groups M and B, except Occupancy Group M with retail stores having an occupant load of more than 100 persons on any floor other than street level.

5. Large mercantile occupancy shall include Occupancy Group M with retail stores having an occupant load of more than 100 persons on any floor other than street level.

6. Industrial occupancy shall include Occupancy Groups F-1, F-2, H-1, H-2, H-3, H-4, H-5, S-1 and S-2.

7. Mixed occupancy occurs where two or more occupancies are located within the same building. Where each occupancy is isolated from the rest of the building by tight walls, floors and ceilings and by self-closing doors, the requirements for each occupancy shall apply to its portion of the building. Where the various occupancies are not so isolated, the occupancy having the most stringent requirements shall be the governing occupancy.

1103.3 System classification.

Refrigeration systems shall be classified according to the degree of probability that refrigerant leaked from a failed connection, seal or component could enter an occupied area. The distinction is based on the basic design or location of the components.

1103.3.1 Low-probability systems.

Double-indirect open-spray systems, indirect closed systems and indirect-vented closed systems shall be classified as low-probability systems, provided that all refrigerant-containing piping and fittings are isolated when the quantities in Table 1103.1 are exceeded.

1103.3.2 High-probability systems.

Direct systems and indirect open-spray systems shall be classified as high-probability systems.

Exception: An indirect open-spray system shall not be required to be classified as a high-probability system if the pressure of the secondary coolant is at all times (operating and standby) greater than the pressure of the refrigerant.