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Section MC 1101: General
Section MC 1102: System Requirements
Section MC 1103: Refrigeration System Classification
Section MC 1104: System Application Requirements
Section MC 1105: Machinery Room, General Requirements
Section MC 1106: Machinery Room, Special Requirements
1106.1 General.
1106.2 Elevated temperature.
1106.3 Ammonia room ventilation.
1106.4 Flammable refrigerants.
1106.5 Remote controls.
1106.5.1 Refrigeration system emergency shutoff.
1106.5.2 Ventilation system.
1106.6 Reserved.
Section MC 1107: Refrigerant Piping
Section MC 1108: Field Test
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1105.11 Emergency signs.
Signs shall comply with the following:
   1.   Sections 8.11.8 and 11.2.4 of ASHRAE 15.
   2.   Refrigeration units or systems having a refrigerant circuit containing more than 220 pounds (99.8 kg) of Group A1 or 30 pounds (13.6 kg) of any other group refrigerant shall be provided with approved emergency signs, charts, and labels in accordance with NFPA 704.
(Am. L.L. 2023/077, 6/11/2023, eff. 6/11/2023)
Editor's note: For related unconsolidated provisions, see Appendix A at L.L. 2023/077.
1105.12 Storing refrigerant.
The total amount of refrigerant stored in a machinery room shall be the lesser of: (i) not more than twenty percent of the normal charge in the system; or (ii) not more than 330 pounds (149.7 kg) in addition to the charge in the system and the refrigerant contained in a permanently attached receiver. Refrigerant shall be stored in containers meeting the requirements of the New York City Fire Code. 
   Exception: Recovery service containers used for storing refrigerant during periods of system maintenance or replacement may exceed 330 pounds (149.7 kg) provided such containers are securely fixed in position and have pressure relief valves piped to the outside in conformance with this code.
Section MC 1106: Machinery Room, Special Requirements
1106.1 General.
Where required by Section 1104.2, the machinery room shall meet the requirements of this section in addition to the requirements of Section 1105.
1106.2 Elevated temperature.
There shall not be an open flame-producing device or continuously operating hot surface over 800°F (426.7°C) permanently installed in the room.
1106.3 Ammonia room ventilation.
Ventilation systems in ammonia machinery rooms shall be operated continuously at the ventilation rate specified in Section 1105.6.3.
   Exceptions:
      1.   Machinery rooms equipped with a vapor detector that will automatically start the ventilation system at the ventilation rate specified in Section 1105.6.3 and that will actuate an alarm at a detection level not to exceed 1,000 ppm.
      2.   Machinery rooms conforming to the Class 1, Division 2, hazardous location classification requirements of the New York City Electrical Code. 
1106.4 Flammable refrigerants.
Where refrigerants of Groups A2, A3, B2 or B3 are used, the machinery room shall conform to the Class 1, Division 2, hazardous location classification requirements of the New York City Electrical Code.
   Exceptions: 
      1.   Ammonia machinery rooms that are provided with ventilation in accordance with Section 1106.3. Nothing in this section shall be construed to approve the use of Group A3 and B3 refrigerants if otherwise prohibited.
      2.   Machinery rooms for systems containing Group A2L refrigerants that are in accordance with ASHRAE 15.
(Am. L.L. 2023/077, 6/11/2023, eff. 6/11/2023)
Editor's note: For related unconsolidated provisions, see Appendix A at L.L. 2023/077.

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