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0 MANE- <br /> Selection Procedure <br /> Step 5. <br /> Compare results to original load requirements. If the performance will not meet the required total <br /> or sensible cooling load,try a selection at the next higher size unit. <br /> Heating Capacity <br /> Step 1. <br /> Calculate the building heating load using the Trane®calculation form or other standard accepted <br /> method. <br /> Step 2. <br /> Size the equipment using Table 37, p. 52 to match the heating loads at design conditions. <br /> Total heating load of 65 MBh <br /> Outdoor Ambient(Winter): 17 DB <br /> Indoor Return Temperature: 70 DB <br /> Airflow: 2000 cfm <br /> Use the integrated portion ofTable 37,p. 52 fortheWSC072E to determine capacity at winter design <br /> conditions.The mechanical heating portion of the heat pump will provide 40.5 MBh. <br /> Step 3. <br /> Because 40.5 is less than the building's required heating capacity at winter design conditions, a <br /> supplementary heater must be selected. <br /> 65 MBh-40.5MBh = 19.5 MBh <br /> The auxiliary electric heat capacities are listed in Table 30,p.47. From the table,a 9 kW heater will <br /> deliver 30.73 MBh at 480 volts. In order to determine capacity at 460 volts,the heater voltage <br /> correction factorfrom Table 31,p. 48 must be used.Therefore,30.73 MBH x.918(voltage correction <br /> factor) =28.2 MBh.A 9 kW heater should be selected. <br /> Air Delivery Selection <br /> External static pressure drop through the air distribution system has been calculated to be 0.60 <br /> inches of water.Enter Table 29,p.46 for a WSC072E4 at 2400 cfm and 0.60 static pressure.The belt <br /> drive motor will give the desired airflow at a rated bhp of 0.75 and 847 rpm. <br /> PKGP-PRC013K-EN 19 <br />