1106.4 Natural Ventilation. Where a refrigerating system

is located outdoors more than 20 feet (6096 mm) from buildings opening and is enclosed by a penthouse, lean-to, or other open structure, natural or mechanical ventilation shall be provided. The requirements for such natural ventilation shall be in accordance with the following:

216 2019 CALIFORNIA MECHANICAL CODE

REFRIGERATION

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REFRIGERATION

more refrigerant detectors, in accordance with the requirements of Section 1106.2.2.1 and Section 1106.2.2.2. 1107.1.7.2 Refrigeration Detectors. For the refrigerant detection required in Section 1106.2.2.1, detection of refrigerant concentration that exceeds 25 percent of the LFL or the upper detection limit of the refrigerant detector, whichever is lower, shall automatically de-energize the following equipment in the machinery room: (a) refrigerant compressors (b) refrigerant pumps (c) normally-closed automatic refrigerant valves 1107.1.7.3 Machinery Rooms. The machinery room shall comply with Section 1107.1.8. 1107.1.8 Group A2, A3, B2, or B3 Refrigerants. Where any refrigerant of Groups A2, A3, B2, or B3 are used, the machinery room shall comply with Class 1, Division 2, of the California Electrical Code . 1107.1.9 Refrigeration Systems. As part of the mechanical ventilation system in accordance with Section 1106.2.4, refrigeration systems that contain more than 110 pounds (50 kg) of any Group A2L, A2, A3, B2L, B2, or B3, refrigerant shall have not less than one exhaust air inlet located adjacent to each system not more than 9 feet (3 m) away. 1107.1.10 Remote Control. Remote control of the mechanical equipment in the refrigeration machinery room shall be provided immediately outside the machinery room door solely for the purpose of shutting down the equipment in an emergency. Ventilation fans shall be on a separate electrical circuit and have a control switch located immediately outside the machinery room door.