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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.
1106.5 Remote controls.
Remote control of the mechanical equipment and appliances located in the machinery room shall be provided at an accessible location immediately outside the machinery room and adjacent to its principal entrance and shall comply with Sections 1106.5.1 and 1106.5.2.
1106.5.1 Refrigeration system emergency shutoff.
A clearly identified switch of the break-glass type or an approved tamper-resistant switch shall provide off-only control of refrigerant compressors, refrigerant pumps, and normally closed, automatic refrigerant valves located in the machinery room. Additionally, this equipment shall be automatically shut off whenever the refrigerant vapor concentration in the machinery room exceeds the vapor detector's upper detection limit or 25 percent of the LEL, whichever is lower.
1106.5.2 Ventilation system.
A clearly identified switch of the break-glass type or an approved tamper-resistant switch shall provide on-only control of the machinery room ventilation fans.
1106.6 Reserved.
1107.1 General.
The design of refrigerant piping shall be in accordance with ASME B31.5. Refrigerant piping shall be installed, tested and placed in operation in accordance with this chapter.
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