2021 RETA Breeze May-June

Appendix J describes for machinery room door signage, all entrances to a machinery room include the following information: 1. Refrigeration Machinery Room 2. Authorized Personnel Only 3. Caution – Ammonia R-717 4. Caution – Eye and Ear Protection Required 5. NFPA 704 – Ammonia Fire Diamond (Blue-3, Red-3, Yellow-0) Standards require a clearly identified, tamper resistant break-glass type, global system shut-down emergency stop switch, to be located outside and adjacent to the designated principal machinery room exit door(s). The E-Stop switch must immediately shut down compressors, refrigerant pumps, and the normally closed refrigerant control valves. Additional switches may be co-located to activate the emergency ventilation fans or other emergency equipment. D Emergency Stop andVentilation Switches

Note: Monitored location is defined as a means of continual oversight such as pager, on-site staff, third party alarm service, or a responsible party. And, for areas where ammonia is utilized, which is not part of the main machine room, such as evaporators in cold rooms, loading docks, production areas, etc.: • shutdown hot gas and liquid feed solenoids and fans. 150 ppm – This is 50% of the IDLH for ammonia. APR/SCBA - PPE required; Machine Room activate emergency ventilation capable of providing not less than 30 air changes per hour. 40,000 ppm – This is 25% of the LEL/LFL for ammonia (or maximum reading on the highest reading sensor), whichever is less. Shut down all power to the area except emergency ventilation and telemetry. ALARM SIGNAGE Ammonia detection alarm signage shall be placed next to the actual audio / visual alarms that identify these alarms as part of B

the ammonia detection system. Appendix J describes for machinery room door signage, that all entrances to a machinery room include the following information: Warning –When Alarms Are Activated, Ammonia Has Been Detected a. Leave room immediately when alarms are activated. b. Do not enter except by emergency trained personnel only. c. Do not enter without personal protective equipment. Machinery room entrances shall be provided with signage which: (1) restricts the area to authorized personnel only, (2) indicates the proper NFPA 704 designation. C Machinery RoomDoor Signage

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