Manual
7
Maximum RPM
CA SWSI,
CPS-A,
CPA-A, Size
Maximum RPM
CA & CAF
DWDI
Size
Maximum RPM
Class
I
Class
II
Class
III
Class
I
Class
II
Class
III
120 3348 4368 5503 120 3714 4846 6105
135 2976 3883 4892 135 3307 4315 5436
150 2678 3494 4403 150 2575 3357 4230
165 2435 3177 4002 165 2374 3095 3901
180 2114 2757 3474 180 2176 2839 3577
195 1951 2545 3207 195 2009 2621 3302
210 1812 2363 2978 210 1865 2434 3066
225 1691 2206 2779 225 1741 2271 2862
245 1553 2026 2553 245 1631 2128 2681
270 1419 1851 2332 270 1443 1883 2372
300 1277 1666 2099 300 1262 1647 2074
330 1161 1514 1908 330 1147 1496 1885
365 1064 1388 1749 365 1038 1354 1706
402 965 1259 1586 402 941 1228 1547
445 873 1138 1434 445 851 1110 1399
490 793 1034 1303 490 773 1009 1271
540 719 938 1182 540 702 916 1164
600 647 844 1064 600 631 823 1037
660 588 768 967 660 574 749 944
730 532 694 874 730 519 677 853
+200F and capable of intermittent highs of +250F. For
temperatures above 250°F Mobiltemp SHC 32 is
recommended.
Lubrication - Motor Bearings
Motors are provided with prelubricated bearings. Any
lubrication instructions shown on the motor nameplate
supersede instructions below.
Motor bearings without provisions for relubrication will
operate up to 10 years under normal conditions with no
maintenance. In severe applications, high temperatures or
excessive contaminates, it is advisable to have the
maintenance department disassemble and lubricate the
bearings after 3 years of operation to prevent interruption of
service.
For motors with provisions for relubrication, follow
intervals of the following table.
Motors are provided with a polyurea mineral oil NGLI #2
grease. All additions to the motor bearings are to be with a
compatable grease such as Exxon Mobil Polyrex EM and
Chevron SRI.
The above intervals should be reduced to half for vertical
shaft installations.
Motor Services
Should the motor prove defective within a one-year
period, contact your local Loren Cook representative or
your nearest authorized electric motor service
representative.
Changing Shaft Speed
All belt driven fans with motors up to and including 5 HP
(184T max.) are equipped with variable pitch pulleys. To
change the fan speed, perform the following:
1. Loosen setscrew on driver (motor) pulley and remove
key, if equipped.
2. Turn the pulley rim to open or close the groove facing.
If the pulley has multiple grooves, all must be adjusted
to the same width.
3. After adjustment, inspect for proper belt tension.
Speed Reduction: Open the pulley in order that the belt
rides deeper in the groove (smaller pitch diameter).
Speed Increase: Close the pulley in order that the belt
rides higher in the groove (larger pitch diameter). Ensure
that the RPM limits of the fan and the horsepower limits of
the motor are maintained.
R
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i
cat
i
on
I
nterva
l
s
Service
Conditions
NEMA Frame Size
Up to and
including 184T
213T-365T 404T and larger
1800 RPM
and less
Over 1800
RPM
1800 RPM
and less
Over 1800
RPM
1800 RPM
and less
Over 1800
RPM
Standard 3 yrs. 6 months 2 yrs. 6 months 1 yr. 3 months
Severe 1 yr. 3 months 1 yr. 3 months 6 months 1 months
*Sizes 60 through 100 only applies to CPS
and CPA.
CF SWSI,
CPS, CPA,
Size
Maximum RPM
Class
I
Class
II
Class
III
60-100* 4230 5519 6953
120 3404 4441 5595
135 3026 3948 4974
150 2723 3553 4476
165 2476 3230 4069
180 2269 2961 3730
195 2095 2733 3443
210 1795 2341 2950
225 1675 2185 2753
245 1539 2007 2529
300 1257 1639 2065
330 1142 1490 1877
365 1023 1334 1681
402 939 1225 1543
445 849 1108 1396
490 771 1006 1268
540 700 913 1150
600 630 822 1035
660 573 747 941
730 518 675 851
CPV
Size
Maximum RPM
Standard Reinforced
60-100 2719
--
120 2527
135 2093
150 2035
165 1766
180 1588
195 1429 1571
210 1277 1407
225 1152 1265
245 1015 1260
270 876 1091
300 837 1006
330 716 869
365 624 805
402 539 701
445 463 660
490 360 576
RPM Derating Factor
For elevated airstream temperatures, the max-
imum fan speed limits must be derated by the
factors above.
Temperature
(°F)
RPM Factor
Steel Aluminum
70 1.00 1.00
200 0.98 0.93
300 0.96 0.79
400 0.94
-
500 0.91
600 0.87
700 0.81
800 0.75