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The obligation of Seller under this warranty shall be limited to repairing or replacing F.O.B. Seller’s
plant, or allowing credit at Seller’s option. This warranty is expressly in lieu of all other warranties
expressed or implied including the warranties of merchantability and fitness for use and of all other
obligations and liabilities of the Seller. The Buyer acknowledges that no other representations were made to
him or relied upon him with respect to the quality or function of the products herein sold.
On equipment furnished by the Seller, but manufactured by others, such as motors, Seller extends the same
warranty as Seller receives from the manufacturer thereof. Repairs for motors should be obtained from
nearest authorized motor service station for the make of motor furnished. All motors used are products of
well-known manufacturers with nationwide service facilities. Check the yellow pages of your telephone
directory for the location of the nearest service shop.
TROUBLESHOOTING
In the event that trouble is experienced in the field, the following are the most common fan difficulties.
These points should be checked in order to prevent needless delay and expense.
1. CAPACITY OR PRESSURE BELOW RATING
a.
Incorrect direction of wheel rotation.
b.
Speed too slow.
c.
Dampers not properly adjusted.
d.
Poor fan inlet or outlet conditions (elbows, restrictions).
e.
Air leaks in system.
f.
Damaged wheel.
g.
Total resistance of system higher than anticipated.
h.
Wheel mounted backwards on shaft.
i.
Fan not properly selected for a high temperature and/or high altitude application.
2. VIBRATION AND NOISE
a.
Misalignment of bearings, coupling, wheel or V-belt drive.
b.
Unstable foundation or supports.
c.
Foreign material in fan causing unbalance.
d.
Worn bearings.
e.
Damaged wheel or motor.
f.
Broken or loose bolts and set screws.
g.
Bent shaft.
h.
Worn coupling.
i.
Fan wheel or drive unbalanced.
j.
120 cycle magnetic hum due to electrical input. Check for high or unbalanced voltage.
k.
Fan delivering more than rated capacity.
l.
Loose dampers.
m.
Speed too high or fan rotating in wrong direction.
n.
Vibration transmitted to fan from some other source.
3. OVERHEATED BEARINGS
a.
Check bearing lubrication.
b.
Poor alignment.
c.
Damaged wheel or drive.
d.
Bent shaft.
