2020 Tech Report May-June




FLOAT SWITCH TESTING AUTHORIZED USERS: This procedure is designed for use by Refrigeration Service Technicians to perform testing of liquid level float switches. You must consult facility policy and procedures concerning liquid level float switches. You must follow the facility procedure. This procedure is considered minimum requirements. This procedure is to be used in addition to facility procedures. OBJECTIVE: Maintenance Procedures are designed to give general guidance when performing maintenance activities. No procedure is appropriate for every situation. Refrigeration Service Technicians should not attempt any repair which is beyond their training. CONCERNS: Careful attention to operating conditions is extremely important during this procedure. The primary incident we are trying to prevent is injury to personnel. Additionally, our goal is to avoid system upsets during testing which can lead to operational issues as well as potentially leading to an ammonia release, or mechanical damage of system components. Use by others is not authorized under any circumstances.

REFERENCES: Additional information is available to personnel performing inspections. This information is not required to be reviewed. However, those technicians wishing further information may seek these sources out:

• International Institute of Ammonia Refrigeration (IIAR) Bulletin #109 • International Institute of Ammonia Refrigeration (IIAR) Bulletin #110 • Refrigerating Engineers and Technicians Association (RETA) Industrial Refrigeration Books III and IV • IIAR-5 (Start-up and Commissioning of Closed-Circuit AmmoniaMechanical Refrigerating Systems) • IIAR-6 (Maintenance and Inspection of Closed- Circuit AmmoniaMechanical Refrigerating Systems) (*When released) • Refrigerating Specialties Bulletin 61-10G, TYPE LL, LLC, LLX, LLS, LLSC, LLXS, LLA, LLAC, LLAX

• Hansen Bulletin HLL-2c

• Operation andMaintenance Manuals for facility equipment • Facility policies located in the facility’s Ammonia Refrigeration Compliance Program


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