Twin City Fan & Blower Installation and Maintenance Manual: IM-495
Motor Problems:
1. Incorrect wiring.
2. Speed of fan too high.
3. Parts improperly installed - binding.
4. Bearings improperly lubricated.
5. WR
2
capability of motor too low for application.
6. Protection devices may be improperly sized.
Motor Lubrication
– The major cause of motor bearing failure is
contamination of grease, insufficient grease or incompatibility of
grease. If a fan is to be stored for any length of time at the job
site and the bearings are regreasable, the motor bearings should
immediately be filled with grease while rotating the fan and then
the bearings should be regreased and rotated monthly. This will
prevent moisture, which condenses within the bearing, from
corroding the raceways. Most greases used on motor bearings are
lithium base. Use the greases shown in the motor information. Do
not mix the bases without completely purging out the initial grease.
Initially, follow the lubrication instruction in the motor information.
The frequency of lubrication should be adjusted depending on the
condition of the old grease being purged. This is the responsibility
of the user. If the grease is dirty, the lubrication frequency should
be more often.
a. Noise – If a bearing is increasing in noise intensity and/or
vibration, it will probably result in failure.
b. Temperature – If a bearing temperature begins to gradually
rise, it will generally result in failure. A bearing can operate up
to 200 degrees and operate satisfactorily if the temperature
remains constant and the bearing receives adequate lubrication.
Remember that a roller bearing under the same load and speed
will be somewhat more noisy and run warmer than a ball
bearing. This is normal.
Rough handling and/or dropping a fan can result in brinelling the
bearing. This appears as a clicking noise at first, then gradually
worsens until failure.
Limitation of Warranties and Claims
Seller warrants to the original purchaser that the goods sold
hereunder shall be free from defects in workmanship and material
under normal use and service (except in those cases where the
materials are supplied by the buyer) for a period of one year from
the date of original installation or eighteen (18) months from the
date of shipment, whichever occurs first. The liability of seller under
this warranty is limited to replacing, repairing or issuing credit (at
cost, F.O.B. factory and at seller’s discretion) for any part or parts
that are returned by buyer during such period provided that:
a. seller is notified in writing within ten (10) days following
discovery of such defects by buyer, or within ten (10) days
after such defects should reasonably have been discovered,
whichever is less;
b. the defective unit is returned to seller, transportation charges
prepaid by buyer.
c. payment in full has been received by seller or said products;
and
d. seller’s examination of such unit shall disclose to its satisfaction
that such defects have not been caused by misuse, neglect,
improper installation, repair, alteration, act of God or accident.
e. seller cannot guarantee sound pressure levels or dBA.
No warranty made hereunder shall extend to any seller product
whose serial number is altered, effaced or removed. Seller
makes no warranty, express or implied, with respect to motors,
switches, controls or other components of seller’s product, where
such components are warranted separately by their respective
manufacturers. THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL
OTHER WARRANTIES, EXPRESS OR IMPLIED, WHETHER STATUTORY
OR OTHERWISE, INCLUDING ANY IMPLIED WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. In no
event shall seller be liable to buyer for indirect, incidental collateral
or consequential damages of any kind. (BUYER’S FAILURE TO PAY
THE FULL AMOUNT DUE WITHIN SIXTY (60) DAYS OF DATE OF
INVOICE SHALL OPERATE TO RELEASE SELLER FROM ANY AND ALL
LIABILITY OR OBLIGATION ARISING PURSUANT TO ANY WARRANTY,
EXPRESS OR IMPLIED, WHETHER STATUTORY OR OTHERWISE,
INCLUDING ANY IMPLIED WARRANTY OR MERCHANTABILITY OR
FITNESS FOR A PARTICULAR PURPOSE, MADE IN CONNECTION
WITH ANY CONTRACT FORMED HEREUNDER. BUYER AGREES THAT
SUCH FAILURE TO PAY SHALL CONSTITUTE A VOLUNTARY WAIVER
OF ANY AND ALL SUCH WARRANTIES ARISING PURSUANT TO SUCH
CONTACT.)
