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53.2.1 Emergency Pressure Control System
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Each high and intermediate pressure zone in a refrigeration system shall be provided with a single automatic valve providing a crossover connection to a lower pressure zone. Automatic crossover valves shall comply with 53.2.1.1.1 through 53.2.1.1.4.
Where required by the AHJ, automatic crossover valves shall be capable of manual operation.
Operation of an automatic crossover valve shall cause all compressors on the affected system to immediately stop in accordance with the following:
- Dedicated pressure-sensing devices located immediately adjacent to crossover valves shall be permitted as a means for determining operation of a valve.
- To ensure that the automatic crossover valve system provides a redundant means of stopping compressors in an overpressure condition, high pressure cutout sensors associated with compressors shall not be used as a basis for determining operation of a crossover valve.
Activation of the overpressure sensing device shall cause all compressors on the affected system to immediately stop.
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