Vision CAC 003G - 090G, Installation And Maintenance Manual

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McQuay IM 672-7 27
Operation
Figure 41: Torque for FC Variable Inlet Vanes (in.–lb.) Figure 42: Torque for AF Variable Inlet Vanes (in.–lb.)
300
250
200
150
100
90
80
70
60
50
350 400 450 500
550
600 650 700 750 800 850 900
1000 1500 2000
Fan speed (rpm)
FC22.25
FC20.00
FC18.00
FC15.00
FC12.62
FC24.50
T
orque (in–lb)
300
250
200
150
100
600 650 700 750 800 850
1000
Fan speed (rpm)
900
400
350
550 900
AF40.25
AF27.00
AF24.50
AF22.25
AF20.00
AF38.50
AF33.00
AF30.00
500
600
700
800
2000
1000
1500
1500 2000 3000 2500
T
orque (in–lb)
Table 12: Operating Limits—Plenum Fans
Fan operating limits
Plenum fans
Diameter 13.5 15 16.5 18.25 20 22.25 24.5 27 30 33 36.5 40.25 44.50 49 54.25 60
Max. rpm Class I 2895 2589 2376 2256 2077 1875 1691 1479 1328 1209 1073 972 882 799 725 651
Max. rpm Class II 3786 3384 3100 2959 2703 2413 2199 1928 1730 1579 1401 1264 1150 1043 938 847
Max, rpm Class III 4000 4000 3887 3735 3409 3065 2780 2423 2182 1984 1756 1598 1447 1314 1178 1071
Table 13: Operating Limits—Inline Fans, Twin Fans
Fan operating limits
Inline fans/Twin fans
Diameter 18.25 20 22.25 24.5 27 30 33 36.5 40.25 44.50 49 54.25
Max. rpm Class I 2727 2488 2236 2041 1835 1665 1476 1330 1208 1072 973 880
Max. rpm Class II 3409 3111 2796 2551 2294 2082 1846 1662 1510 1340 1216 1100
Twin fans
Dia. 9 x 9 10.62 12.62 15 18.12 20
Max. rpm 2575 2400 2000 1700 1400 1200
Max. hp 10 15 15 30 40 40