Page 46 - 233423 - Exhaust Fans_Neat

ESI - Efficient Silent Inline Fan Operation and Maintenance Manual

Motors Motor Lubrication Access Doors - They should be tight and
Always disconnect or and Maintenance sealed.
shut off electrical power Regrease or lubricate motor bearings NOTE: The maximum torque values for
before attempting to service fan and/or motor. according to manufacturer's recommen- weld studs are as follows.
All AC induction motors will perform dations. DO NOT OVER LUBRICATE. TORQUE
satisfactorily with a 10% variation in Motor manufacturer's lubrication recom- STUD SIZE (FL. LBS.)
voltage, a 5% variation in frequency or a mendations are printed on tags attached 1/4" 5
combination voltage-frequency variation to motor. Should these tags be missing 15/16" 10
of 10%. For motors rated 208-220 volts, the following will apply: 3/8" 17
the above limits apply only to 220 volt 1/2" 39
rating. To select control for 208-220 volt FRACTIONAL HORSEPOWER BALL 5/8" 83
motors, use same amps for either 208 or BEARING MOTORS:
220 volts. Under normal conditions, ball bearing The fan bearings, whether pillow block
Motors are received with bearings motors will operate for five years without or flange mounted, are prelubricated and
lubricated and require no lubrication relubrication. Under continuous operation should not require additional grease for
for some time depending on operating at higher temperature (but not to exceed start-up.
conditions. (See MAINTENANCE SECTION 140°F ambient) relubricate after one year. "Bump" the motor to check for proper
on Motor Bearings) INTEGRAL HORSEPOWER BALL impeller rotation. The motor should be
BEARING MOTORS started in accordance with manufacturer's
TO REVERSE DIRECTION OF ROTATION Motors having pipe plugs or grease recommendations.
Single Phase Motors fittings should be relubricated while warm Bearings - Check bearing alignment and
Shaded Pole Rotation cannot be reversed and at a stand still. Replace one pipe plug make certain they are properly locked to
unless motor is constructed on each end shield with grease fitting. shaft.
so that the shading coil on Remove other plug for grease relief. Use Impeller - Turn over rotating assembly
one half of the stator pole low pressure grease gun and lubricate by hand to see that it runs free and does
can be shifted to the other until grease appears at grease relief. not bind or strike fan housing. If impeller
half of the stator pole. Allow motor to run for 10 minutes to expel strikes housing, it may have to be moved
Split Phase Interchange connections excess grease. Replace pipe plugs. on the shaft or bearing pillow blocks and
to supply of either main or Recommended relubrication intervals - reshimmed. Check location of impeller in
auxiliary winding. general guide only. relation to fan inlets. Be sure fan housing is
Capacitor All types of capacitor motors Standard Severe Duty Extreme Duty not distorted. See ALIGNMENT section.
are reversed in rotation by H.P. Duty 24 Hr./Day Very Dirty Driver - Check electrical wiring to the
interchanging connections Range 8 Hr./Day Dirty, Dusty High Ambients motor. See MOTOR section.
to supply of either main or 1 1/2 - 7 1/2 5 Years 3 Years 9 Months Guards - Make certain all safety guards
auxiliary winding. 10 - 40 3 Years 1 Year 4 Months are installed properly.
Repulsion Remove plate on motor 50 - 150+ 1 Year 9 Months 4 Months
end bracket and turn Belt Drive - Must be in alignment; with
bracket (holding Brushes) in These ball bearing greases or their belts at proper tension. See BELT DRIVE
direction opposite to equivalents are satisfactory for ambient section.
direction of existing rotation. temperatures from 20°F to 200°F. Duct Connections - The connections
NOTE: It is suggested that rotation change Chevron SRIU #2 (Standard Oil of from fan to ductwork must not be distorted.
be made for single phase motors by the California) Ducts should never be supported by
manufacturer's approved repair shop. Chevron BRB #2 (Standard Oil of the fan. Expansion joints between duct
connections should be used where
California)
Three Phase Motors expansion is likely to occur or where the
To reverse rotation, interchange any two Premium RB (Texaco, Inc.) fan is mounted on vibration isolators. All
line leads. Alvania No. 2 (Shell Oil Company) joints should be sealed to prevent air leaks
Normal operation of motors results in Make certain motor is not overloaded. and all debris removed from ductwork and
fan.
temperature rise. Permitted temperature Check amps. with nameplate.
rise depends on type of motor installation. Dampers and Variable Inlet Vanes (VIVs) -
The total motor operating temperature KEEP MOTORS DRY. Where motors They should operate freely with blades
includes ambient temperature plus motor are idle for a long time, single phase closed tightly. All dampers and VIVs should
temperature rise. The motor temperature heaters or small space heaters might be be partially closed during starting periods
rise includes nameplate temperature rise, necessary to prevent water condensation to reduce power requirements. This is
service factor allowance and hot spot in windings. particularly important for a fan designed
allowance. for high temperature operation being "run
Start-Up in" at room temperature or at appreciably
IMPORTANT NOTE: less than design temperature. When air is
MOTORS ARE WARRANTED BY Before Start-Up: up to temperature, the damper or VIV may
THE MOTOR MANUFACTURER. Fastenings - It is recommended that all be opened. Complete closing of dampers
PENNBARRY WILL ASSIST IN foundation bolts, impeller hub set screws could cause the fan to run rough.
LOCATING A LOCAL VENDOR and bearing set screws be checked for Fan may now be brought up to speed.
APPROVED REPAIR SHOP, tightness before start-up. Watch for anything unusual such as
IF REQUIRED. vibration, overheating of bearings and

1401 North Plano Road, Richardson, Texas 75081
Phone: 972.234.3202 ■ Fax: 972.497.0468 PENNBARRY 3