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AIR-FLOW PERFORMANCE – 7.5 TON MODELS
55
AIRFLOW PERFORMANCE—RKNB- SERIES
AIRFLOW PERFORMANCE—7.5 TON [26.4 kW]
1097
2328 11263100 [1463] 560 804 598 940 632 1010 664 713 772 1311 801 1373 830 1435 860 1497 889 1559 921 1816 950 1901 979 1987 1009 2072 1038 2157 1068 2243
3200 [1510]
576 876 612 1011 646 1089 678 722 781 1371 810 1433 839 1495 868 1557 898 1619 928 1880 957 1965 987 2051 1016 2136 1045 2222
2414
1075 2307
3300 [1557]
592 954 628 1096 660 1168 692 731 789 1431 818 1493 848 1555 877 1617 906 1859 935 1944 965 2029 994 2115 1023 2200 1053
Capacity 7.5 Ton [26.4 kW]
2286 1082 2371
3400 [1605]
607 1030 643 1180 673 1247 710 739 798 1491 827 1553
RPM W RPM W RPM W RPM RPM RPM W RPM W RPM W RPM W RPM W RPM W RPM W RPM W RPM W RPM W RPM W
2400 [1133]
— — — —
540 580 582 612 711 890 740 952 770 1014 799 1076 828 1138 857 1200 887 1261 929 1538 958 1623 987 1709 1017 1794
2500 [1180]
— — — —
552 633 593 624 720 950 749 1012 778 1074 808 1136 837 1198 866 1260 895 1322 936 1602 965 1687 995 1773 1024 1858
2600 [1227]
— — — —
564 687 603 635 729 1010 758 1072 787 1134 816 1196 846 1258 875 1320 914 1581 943 1666 972 1751 1002 1837 1031 1922
2700 [1274]
— —
539 670 577 744 614 648 737 1070 766 1132 796 1194 825 1256 854 1318 883 1380 921 1645 950 1730 980 1816 1009 1901 1038 1986
2800 [1321]
— —
554 733 590 801 625 660 746 1131 775 1192 804 1254 834 1316 863 1378 892 1440 928 1709 958 1794 987 1880 1016 1965 1046 2050
2900 [1369]
— —
569 801 604 866 638 673 755 1191 784 1253 813 1315 842 1376 872 1438 906 1688 936 1773 965 1858 994 1944 1024 2029 1053 2115
3000 [1416]
546 741 854 869 617 931 650 685 763 1251 792 1313 822 1375 851 1437 880 1498 913 1752 943 1837 972 1923 1002 2008 1031 2093 1060 2179
3500 [1652] 622 1112 658 1271 689 1344 719 748 807 1552 836 1613 865 1675 894 1737 920 1987 950 2072 979 2158 1009 2243 1038 2328 1067 2414 1097 2499
856 1615 886 1677 913 1923 943 2008 972 2094 1001 2179 1031 2264 1060 2350 1089 2435
3600 [1699] 638 1202 672 1361 704 1440 728 757 815 1612 844 1674 874 1735 903 1797 928 2051 957 2136 986 2222 1016 2307 1045 2393 1075 2478 1104 2563
Air
Flow
CFM [L/s]
1156 2499
1104 2392 1134 2478 1163 2563
1111 2456 1141 2542 1170 2627
RPM W RPM W RPM W
1046 1879 1075 1965 1105 2050
1053 1944 1083 2029 1112 2114
1061 2008 1090 2093 1119 2178
1068 2072 1097 2157 1127 2243
1075 2136 1104 2221 1134 2307
1082 2200 1112 2285 1141 2371
1090 2264 1119 2350 1148 2435
1126 2585 1155 2670 1185 2756
1119 2521 1148 2606 1178 2691
1133 2649 1163 2734 1192 2820
0.1 [.02] 0.2 [.05] 0.3 [.07] 0.4 [.10] 0.7 [.17] 0.8 [.20] 0.9 [.22] 1.0 [.25] 1.1 [.27] 1.2 [.30] 1.3 [.32] 1.4 [.35] 1.5 [.37] 1.6 [.40] 1.7 [.42] 1.8 [.45] 1.9 [.47] 2.0 [.50]
External Static Pressure—Inches of Water [kPa]
743
751
760
769
RPM
645
656
667
680
708
725
734
777
786
1107
1189
1274
1306
W
664
717
769
828
887
956
1024
1366
1426
0.6 [.15]0.5 [.12]
1249
1309
1369
1430
W
812
878
945
1017
1069
1129
1189
1490
1550
1187
1247
1307
1368
W
729
791
853
923
993
1069
1144
1428
1488
Drive Package L M
Motor H.P. [W] 2.0 [1491.4] 2.0 [1491.4]
Blower Sheave BK110 BK90
Motor Sheave 1VP-44 1VP-44
Turns Open 1 2 3 4 5 6 1 2 3 4 5 6
RPM 682 650 620 587 555 523 869 838 806 774 742 710
N
3.0 [2237.1]
BK65
1VP-44
1 2 3 4 5 6
1157 1106 1056 1005 954 904
NOTES: 1. Factory sheave settings are shown in bold print.
2. Re-adjustment of sheave required to achieve rated airflow at ARI minimum E.S.P.
3. Do not operate above blower RPM shown as motor overloading will occur.
4. Do not set motor sheave below one turn open.
NOTE: L-Drive left of 1st bold line, M-Drive in middle of bold lines, N-Drive right of 2nd bold line.
AIRFLOW CORRECTION FACTORS
7.5 TON [26.4 kW]
0.98 0.99TOTAL MBH
0.99
0.97
0.97
3000
[1416]
1.00 1.01
1.000.99
1.02
3400
[1605]
POWER kW 1.000.99
1.00
3200
[1510]
0.94SENSIBLE MBH 0.91
2800
[1321]
ACTUAL—CFM
[L/s]
2600
[1227]
1.02
1.01
1.05
3600
[1699]
1.03
1.02
1.08
3800
[1793]
COMPONENT AIR RESISTANCE, IWC
7.5 TON [26.4 kW]
Component
Standard Indoor Airflow—CFM [L/s]
2400
[1133]
2600
[1227]
2800
[1321]
3000
[1416]
3200
[1510]
3400
[1604]
3600
[1699]
Resistance—Inches Water [kPa]
Wet Coil
0.047
[0.012]
0.051
[0.013]
0.055
[0.014]
0.060
[0.015]
0.065
[0.016]
0.071
[0.018]
0.076
[0.019]
Economizer
100% R.A. Damper Open
0.05
[0.012]
0.06
[0.015]
0.07
[0.017]
0.08
[0.020]
0.09
[0.022]
0.10
[0.025]
0.11
[0.027]
Horizontal Economizer
100% R.A. Damper Open
0.03
[0.007]
0.04
[0.009]
0.04
[0.010]
0.05
[0.011]
0.05
[0.012]
0.06
[0.014]
0.06
[0.015]
Concentric Diffuser RXRN-FA65 or
FA75 & Transition RXMC-CD04
DNA
.017
[0.042]
.020
[0.050]
.025
[0.062]
.031
[0.077]
.037
[0.092]
DNA
Concentric Diffuser RXRN-AA61 or
AA71 & Transition RXMC-CE05
DNA DNA DNA DNA DNA
DNA
.017
[0.042]
Horizontal Economizer
100% O.A. Damper Open
0.08
[0.020]
0.08
[0.020]
0.08
[0.020]
0.10
[0.024]
0.11
[0.027]
0.12
[0.030]
0.13
[0.032]
NOTES: 1. Multiply correction factor times gross performance data.
2. Resulting sensible capacity cannot exceed total capacity.
[ ] Designates Metric Conversions
NOTE: Add component resistance to duct resistance to determine total external static pressure.
DNA = Data not Available.
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