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FOOD SERVICE <br />EQUIPMENT <br />Section 11400 <br />15-1207 <br />4. SAFETY CAUTION <br />A. Each system and evaporator is shipped under nitrogen pressure. Use <br />caution and exercise safety at all times when preparing for final hook-up. <br />5. EVAPORATOR COIL <br />A. Evaporator coils shall be direct expansion type fabricated of copper tubes <br />with aluminum fins. All evaporator coils shall be provided with solenoid <br />valve, thermostatic expansion valve, and electronic thermostat, piped and <br />wired to the junction box for positive pump down. <br />B. Evaporative coils shall be equipped with energy saving "EC" motors. <br />CONSTRUCTION NOTES FOR TRADES <br />1. CONTRACTOR <br />A. Contractors shall verify all dimensions and coordinate with other trades. <br />B. Contractor shall prepare and weather proof the platform and curbed <br />openings for refrigeration piping and electrical conduit. <br />C. Contractor to provide underground trenching including all backfill for <br />conduits. <br />2. REFRIGERATION CONTRACTOR <br />A. Contractor shall use only clean dehydrated, sealed refrigeration grade <br />A.C.R. copper tubing. Use only long radius elgows to reduce flow <br />resistance and line breakage. Do not use 45 degree elbows at all. <br />B. Silver solder and/or sil-fos shall be used on all refrigerant piping. Soft <br />solder is not acceptable. Use minimum 35 % silver solder for dissimilar <br />metals. <br />C. All piping must be supported with hangers that can withstand the <br />combined weight of tubing, insulation, valves, and fluid in the tubing. <br />D. Use dry hydrogen in the copper tubing during brazing to prevent <br />formation of copper oxides. Liquid and suctions lines must be free to <br />expand independently of each other. Do not exceed 100 feet without a <br />change in direction or an offset. Plan proper pitching, expansion <br />allowance, and p -Traps at the base of all suctions risers and at every 15 <br />feet of every vertical rise. Install service valves at several locations for <br />ease of maintenance. These valves must be approved for 450 PSI <br />working pressure. <br />E. All piping to be pressure tested with nitrogen at 300 PSI with all valves <br />open and held for 12 hours. Electronic leak detectors shall be used to <br />locate all leaks. <br />24 <br />