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• If each cell is to be equipped with an outlet, side - suctions Makeup %Mater Flow Required -GPM can be used on end cells of multicell towers, but not on to Maintain Three (3) Concentrations interior cells. For direct outlet from each cell on installations Tower Cooling "Range" (hot water minus cold water) of three or more cells, use either the depressed sump or GPM 5" F 10" F 15 F 20° F 30° F 40° F bottom outlet on interior cells. 200 2 3 4 5 8 10 The best choice for a tower used with a remote or indoor 400 3 5 8 10 15 20 600 storage tank —see page 20 —or on a concrete cold water 800 4 8 12 15 23 30 basin is usually a bottom outlet. 800 5 10 15 20 30 40 1,000 7 13 19 25 38 50 A side - suction equipped tower can be installed on a flat 1,soo 10 19 29 38 57 75 concrete slab if a side drain and overflow are also speci- 2,000 13 25 38 50 75 100 fied —see page 16. Consult your Marley sales engineer for 3,000 19 38 57 75 113 150 complete information. 4,000 25 50 75 100 150 200 5,000 32 63 94 125 188 250 ,000 38 `` -75 1 150 225 300 Makeup ✓` 8,000 50 100 150 200 300 400 The amount of water constantly evaporated from a NOTE cooling tower varies directly with the heat load applied. In If circulating water is to be maintained at 2 concentrations instead of addition to evaporation, water is normally lost to the blow- 3, multiply table GPM values by 1.36 before sizing makeup valve. down (bleed -off) necessary to maintain dissolved solids concentration at an acceptable level in the circulating water system. The NC is equipped with one or more float- operated, mechanical makeup valves to automatically replenish this Makeup Valve Flow Capacities-GPM lost water. The tables on this page, calculated for a concen- Pressure at Valve Inlet 1" Diameter 2" Diameter tration of 3 times normal, indicate the rate of water loss—and while flowing-psig Valve Valve the size ofvalve(s) required. If your installation's cold water 10 56 90 basin will drain by gravity to a remote storage tank —or if you plan a separate means of controlling makeup water— 20 78 120 a price reduction is available fordeleting the Marley- supplied 30 92 143 valve(s). Marley also offers an optional electronic liquid - 40 106 160 level contol. 50 117 167 77 NOTE �/ • If makeup water pressure exceeds 50 psig, use pressure reduc=r ahead of valve. ) • For flow requirements exceeding the above limitations, use / \ multiples of the same size valve. 11