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75 1 1 2 3 5 7,5 10 15 20 25 30 40 50 60 75 100 125 150 200 250 Motor Motor Motor In, Full Load Out, 2nd Driven Motor Driven Driven Motor Nominal EquipEffiEquipEquipType rpm ment in ciency in ment in ment Out Space Percent Space of Space Btuh Btuh Btuh Split Ph. 1750 54 1,180 640 540 Split Ph. 1750 56 1,500 840 660 Split Ph. 1750 60 2,120 1,270 850 3-Ph. 1750 72 2,650 1,900 740 3-Ph. 1750 75 3,390 2,550 850 3-Ph. 1750 77 4,960 3,820 1,140 3-Ph. 1750 79 6,440 5,090 1,350 3-Ph. 1750 81 9,430 7,640 1,790 3-Ph.

2 Specific Volume Sat. 05078 †Based on “1967 ASME Steam Tables” 58 Specific Enthalpy Sat. Liquid Sat. Ft. Occupancy Lights Refrigeration Sq. Ft. Ft. Occupancy Lights Refrigeration Sq. Ft. 0 Dept. 5 Refrigeration for Central Heating and Cooling Plant Urban Districts 285 College Campuses 240 Commercial Centers 200 Residential Centers 375 60 Refrigeration and air quantities for applications listed in this table of cooling load check figures are based on all-air system and normal outdoor air quantities for ventilation except as noted.

Do not drive sheaves on or off shafts. Be sure shaft and keyway are smooth and that bore and key are of correct size. 6. Belts should never be forced or rolled over sheaves. More belts are broken from this cause than from actual failure in service. 7. In general, ideal belt tension is the lowest tension at which the belt will not slip under peak load conditions. Check belt tension frequently during the first 24-48 hours of operation. 4 Drive Loss, % Motor Power Output Estimated Belt Drive Loss† Motor Power Output, hp Higher belt speeds tend to have higher losses than lower belt speeds at the same horsepower.

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A Hand Book For The Mechanical HVAC Designer


by Michael
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