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1105.9.2 Automatic emergency stop.
An automatic emergency stop feature shall be provided in accordance with Sections 1105.9.2.1 and 1105.9.2.2.
1105.9.2.1 Automatic crossover valves.
A refrigerating system equipped with an automatic crossover valve shall be designed, when such valve is activated, to cause all compressors on the affected system to immediately cease operating. Dedicated pressure-sensing devices located immediately adjacent to crossover valves may be used as a means for activating such crossover valve. To ensure that the automatic crossover valve system provides a redundant means of ceasing operation of the compressors in an overpressure condition, high-pressure cutout sensors associated with compressors shall not be used for purposes of activating such crossover valve.
1105.9.2.2 Overpressure in low-pressure zone.
The lowest pressure zone in a refrigerating system shall be provided with a dedicated means of determining a rise in system pressure to within 15 psi (103.4 kPa) of the zone pressure relief device setpoint. Activation of such overpressure sensing device shall cause all compressors on the effected system to immediately cease operation.
1105.10 Remote control.
A clearly identified switch of the break-glass type shall provide off-only control of the compressors in the machinery room. A second clearly identified switch of the break-glass type shall provide on-only control of the machinery room ventilation fans. Such switches shall be located outside each entrance to the machinery room and as close to the entrance as practicable, except that when an outside location is impracticable, such switches may be located immediately inside the machinery room provided such location is accessible at all times.
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.
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