Section 510-RICR-00-00-4.8 - Chapter 11Add the following new section 1101.1:
1101.1 "Prohibited Connections" The uses of potable water as an open loop, single pass heat exchange fluid for the refrigeration cycle of HVAC equipment is prohibited. Delete IMC section 1105.3 and substitute the following:
1105.3 Refrigerant detector: Machinery rooms shall contain a refrigerant detector with an audible and visual alarm. The detector, or a sampling tube that draws air to the detector, shall be located in an area where refrigerant from leak will concentrate. The alarm shall be actuated at value not greater than the corresponding TLV-TWA values shown for the refrigerant classification. Detectors and alarms shall be placed in approved locations.
Delete IMC section 1105.3 and substitute the following:
1105.9 Emergency pressure control system. Refrigeration systems containing more than 6.6 pounds (93kg) of flammable, toxic or highly toxic refrigerant or ammonia shall be equipped with an emergency pressure control system in accordance with sections 1105.8.1.1 and 1105.8.2.1105.9.1 Automatic crossover valves. 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 sections 1105.8.1.1 through 1105.8.1.3. 1105.9.1.1 Overpressure light 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 fifteen (15) psi (108.4 kPa) of the setpoint for emergency pressure-relief devices.1105.9.1.2 Manual operation. When required by the fire code official, automatic crossover valves shall be capable of manual operation.1105.9.1.3 System design pressure. Refrigeration system zones 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 (2) zones.1105.9.2 Automatic emergency stop. An automatic emergency stop feature shall be provided in accordance with section 1105.9.2.1 and 1105.9.2.2 1105.9.2.1 Operation of an automatic crossover valve. Operation of an automatic crossover valve shall cause all compressors on the effected system to immediately stop. 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 over pressure condition, high-pressure cutout sensors associated with compressors shall not be used as a basis for determining operation of a crossover valve.1105.9.2.2 Overpressure in low-pressure zone. The lowest pressure zone in a refrigeration system shall be provided with a dedicated means of determining a rise in system pressure to within fifteen (15) psi (103.4 kPa) of the setpoint for emergency pressure-relief devices. Activation of the overpressure sensing device shall cause all compressors on the effected system to immediately stop.510 R.I. Code R. 510-RICR-00-00-4.8
Amended effective8/1/2019
Amended effective 2/1/2022