IMI-CPP - page 4

JUNE 2011
maximum operating temperaturesand speeds for which these fansare designed
must not beexceeded. These limitsare given inChicagoBlower Corporation
catalogs, or onChicagoBlower Corporation order forms, or onChicagoBlower
Corporation drawings. Personnel whowill operateormaintain these fans should
begiven thispamphlet to read and bewarned of thepotential hazardsof the
If not installed immediately, the fans should beprotected to remain dry at all
1. Store the fans in a dry area, protected from low temperature, rapid and extreme
changes in humidity, and free from vibration. Block the fanwheels to prevent
2. Every ninety days; turn the fanwheels several revolutionsby hand. Energize
theactuators and cycle them six to eight times.
3. Every sixmonths; lubricate themotor bearings.
D.MAINTENANCE, Lubrication,MotorBearings.
4. Make space heaters operableonmotors so equipped.
5. Motor windings should bemegged at the timeof storage, and againwhen
removed from storage. Resistance readingsat removal must not be less than
fifty-percent of the initial readings. Removal readings less than fifty-percent
of the initial readingsmean themotorsmust bedried, electricallyor
6. Upon removal from storage, lubricate themotor bearings.
D.MAINTENANCE, Lubrication,MotorBearings.
Inlet/Outlet Connections
Ducts should be closely alignedwith fan casingsand flexible connections should
beprovided between the fan casingsand ducts to prevent structure bornenoises
and vibrations from being transmitted through theduct work. Vaneaxial fans
require theair to enter thewheelsunobstructed and special care is required in the
installationof flexible inlet connections. The inlet endsof the fansare under
negativepressure and flexible connectionmaterials tend to be sucked inward,
disrupting the flowof air to thewheelsand causing reduced fan performances.
The thrust of the fansaggravates this situation in that the fans tend tomove
forward, against thedirection of air flow, when they areoperating. Flexible
connectionsat the largediameter of inlet bellsand/or coneseliminate this
All hardware used for support or connectionof CPP fans should beGrade5
Motor leads terminate in the conduit boxesmounted on theexteriors of the fan
casings. Rigid conduit should be run frommotor starters to the fanswith short
sectionsof flexible conduit at the conduit boxes to provide for fanmovement.
Wire sizesandmotor overloads should be sized in accordancewith themotor
nameplateselectrical data.Motor nameplatesare located on the casings, adjacent
to theChicagoBlower Corporation nameplates.
values for CPP fansare quite low in comparisonwith equivalent
centrifugal fansand usually result in start-up timesof three to six seconds. CPP
1,2,3 5,6,7,8,9,10,11
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