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AM 1 TRANE Fan Performance Table 31. Electric heater voltage correction factors(applicable to auxiliary heat capacity) Nominal Distribution Capacity Voltage Voltage Multiplier 240 208 0.751 240 230 0.918 240 240 1.000 480 440 0.840 480 460 0.918 480 480 1.000 600 540 0.810 600 575 0.918 600 600 1.000 Table 32. Air temperature rise across electric heaters(°F) 3 Tons(a) 4 Tons 5 Tons(b) 1200 cfm 1600 cfm 2000 cfm Three Phase Three Phase Three Phase kW Stages WSC036E3,E4,EW WSC048E3,E4,EW WSC060E3,E4,EW 5.00 1 - - - 6.00 1 18.5 10.5 11.4 10.00 2 - - - 12.00 2 36.2 22.3 21.5 13.80 2 - - - 17.40 2 48.2 33.0 30.0 17.60 2 - - - 23.0 2 - - 38.8 Notes: 1. For minimum design airflow,see airflow performance table for each unit. 2. To calculate temp rise at different airflow,use the following formula:Temp. rise across Electric Heater=kWx3414/ 1.08xCFM. (a)The minimum allowable airflow for a 3 ton with a 17.4 kW heater is 1080 cfm. (b)The minimum allowable airflow for a 5 ton unit with a 23.0 kW heater is 1900 cfm. Table 33. 6-10 tons air temperature rise across electric heaters(°F) 6 Tons 71/2 Tons 10 Tons 2000 cfm(a) 3000 cfm 4000 cfm(b) kW Stages WSC072E3,E4,EW WSC092E3,4,W WSC120E3,4,W 9.0 1 14.2 9.5 - 18.0 1 28.5 19.0 14.2 27.0 2 42.7 28.5 21.3 36.0 2 56.9 37.9 28.5 54.0 2 - - 42.7 Notes: 1. For minimum design airflow,see airflow performance table for each unit. 2. To calculate temp rise at different airflow,use the following formula:Temp. rise across Electric Heater=kWx3414/ 1.08xCFM. (a)Minimum allowable airflow with a 36 kW heater for the WSC072E is 2400 cfm in the horizontal duct configuration. (b)Minimum allowable airflow with a 54 kW heater for the WSC120E is 4000 cfm. 48 PKGP-PRC013K-EN