Daikin Vision CAH 003-090 C, Руководство по установке и обслуживанию

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Operating Limits
Do not exceed the operating limits in Table 17 through Table
21 . A fan wheel operated beyond the rpm and temperature
limits shown can suffer permanent distortion or fracture. The
resulting unbalance can cause severe unit vibration .
Table 17: Fan Operating Limits—Unit Sizes 003 to 035
Forward Curved—Housed Airfoil—Housed
Diameter 9×4 9×7 9×9 10 .62 12 .62 15 18 20 22 .25 24 .50 13 .22 14 .56 16 .19 19 .69 21 .56 24 .00
Max . RPM Class I N/A 2189 2223 1934 1614 1328 1155 1050 944 858 3000 3000 2300 2000 1700 1500
Max . RPM Class Il 2244 2854 2896 2518 2091 1725 1450 1200 1030 910 4335 3918 3457 2858 2427 2255
Table 18: Fan Operating Limits—Unit Sizes 040–090
Forward Curved—Housed Airfoil—Housed
Diameter 20 22 .38 25 27 .62 30 .25 33 36 20 22 .25 24 .5 27 30 33 36 .5
Max . RPM Class I 1010 930 790 690 650 600 560 2077 1875 1691 1479 1328 1209 1073
Max . RPM Class Il 1281 1178 1011 910 835 763 715 2703 2413 2199 1928 1730 1579 1401
Table 19: Fan Operating Limits—Belt-Drive Plenum Fans
Belt-Drive Plenum fans
Size 13 15 16 18 20 22 24 27 30 33 36 40 44 49 54 60
Max . RPM Class II 3909 3468 2820 2930 2674 2403 2183 1860 1783 1620 1465 1329 1202 1091 986 891
Max . RPM Class IlI 4000 4000 3887 3735 3409 3065 2780 2423 2182 1984 1759 1598 1447 1314 1178 1071
Table 20: Fan Operating Limits—Direct-Drive Plenum Fans
Direct-Drive Plenum Fans
Size 11 12 13 15 16 18 20 22 24 27 30 33 36 40 44 49 54 60
Max . RPM Class II 4000 4000 — 3909 3650 3650 2674 2403 2183 1981 1783 1620 1465 1329 1202 — — —
Max . RPM Class IlI — — 4000 4000 3887 3735 3409 3065 2780 2423 2182 1984 1759 1598 1447 1314 1178 1071
Table 21: Fan Operating Limits—Inline Fans, Twin Fans
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
Diameter 9×9 10 .62 12 .62 15 18 .12 20
Max . RPM 2575 2400 2000 1700 1400 1200
Max . HP 10 15 15 30 40 40
Fan Vibration Levels
Each unit as shipped is trim balanced to operate smoothly . To
provide satisfactory operation after shipping and installation,
use the accepted industry guidelines for field balancing fans.
See Table 22 .
Table 22: Vibration Levels
Fan Speed (RPM) Vibration
800 or less 5 mils maximum displacement
801 or greater 0 .20 in/sec . maximum velocity
Note:
Excessive vibration from any cause contributes to premature fan and motor
bearing failure . Monitor overall vibration levels every six months of operation .
An increase in levels is an indication of potential trouble .
Vibration Causes
1 . Wheel imbalance .
a . Dirt or debris on wheel blades.
b . Loose set screws in wheel hub or bearing-to-shaft.
c . Wheel distorted from overspeed .
2 . Bent shaft .
3 . Drive faulty .
a . Variable pitch sheaves—axial and radial runout of
flanges; uneven groove spacing; out of balance.
Also similar faults in driven sheave .
b . Bad V-belts; lumpy, or mismatched; belt tension
too tight or too loose .
4 . Bad bearings, loose bearing hold-down bolts.
5 . Motor imbalance .
6 . Fan section not supported evenly on foundation .
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