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Section MC 1101: General
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Section MC 1105: Machinery Room, General Requirements
1105.1 Design and construction.
1105.2 Openings.
1105.3 Refrigerant detector.
1105.4 Tests.
1105.5 Fuel-burning appliances.
1105.6 Ventilation.
1105.6.1 Discharge location.
1105.6.2 Makeup air.
1105.6.3 Ventilation rate.
1105.6.3.1 Quantity-normal ventilation.
1105.6.3.2 Quantity-emergency conditions.
1105.7 Termination of relief devices.
1105.7.1 Discharge of Group A2, B2, A3 and B3 refrigerants.
1105.7.2 Certificate of qualification.
1105.8 Ammonia discharge.
1105.9 Emergency pressure control system.
1105.9.1 Automatic crossover valves.
1105.9.1.1 Overpressure limit setpoint.
1105.9.1.2 Manual operation.
1105.9.1.3 System design pressure.
1105.9.2 Automatic emergency stop.
1105.9.2.1 Automatic crossover valves.
1105.9.2.2 Overpressure in low-pressure zone.
1105.10 Remote control.
1105.11 Emergency signs.
1105.12 Storing refrigerant.
Section MC 1106: Machinery Room, Special Requirements
Section MC 1107: Refrigerant Piping
Section MC 1108: Field Test
Section MC 1109: Periodic Testing
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1105.9 Emergency pressure control system.
Permanently installed refrigeration systems containing more than 6.6 pounds (3 kg) of a refrigerant other than a Group A1 refrigerant shall be provided with an emergency pressure control system in accordance with Sections 1105.9.1 and 1105.9.2.
1105.9.1 Automatic crossover valves.
Each high- and intermediate-pressure zone in a refrigerating system shall be provided with a single automatic valve providing a crossover connection to a lower pressure zone. Such automatic crossover valves shall comply with Sections 1105.9.1.1 through 1105.9.1.3.
1105.9.1.1 Overpressure limit setpoint.
Automatic crossover valves shall be arranged to automatically relieve excess system pressure to a lower pressure zone if the pressure in a high- or intermediate-pressure zone rises to within 15 psi (108.4 kPa) of the setpoint for pressure-relief devices.
1105.9.1.2 Manual operation.
Automatic crossover valves shall be capable of manual operation for refrigerating systems containing more than 200 pounds (90.8 kg) of refrigerant.
1105.9.1.3 System design pressure.
Refrigerating system zones that are connected to a higher pressure zone by an automatic crossover valve shall be designed to safely contain the maximum pressure that can be achieved by interconnection of the two zones.
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.

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