Page 48 - 233423 - Exhaust Fans_Neat

ESI - Efficient Silent Inline Fan Operation and Maintenance Manual

be about 1/3 full, as excess grease may shafts. ● Be sure all safety guards are in place.
cause overheating. Use a low pressure ● Start the fan. Check for proper ● Start the fan and run at full speed.
gun. rotation of impeller. Run fan at full Adjust belt tension until only a slight
These ball bearing greases or their speed. A slight belt bow should bow appears on the slack side of the
equivalents are satisfactory for ambient appear on the slack side. Adjust belt belts. If slippage occurs, a squeal will
temperatures from 20°F to 200°F. tension by adjusting motor on its be heard at start-up. Eliminate the
Chevron SRIU #2 (Standard Oil of adjustable base. squeal by tightening the belts.
California) ● If belts squeal excessively at start- ● Belts require time to become fully
Chevron BRB #2 (Standard Oil of up, they are too loose and should be seated in the sheave grooves. Check
California) tightened. belt tension after 8, 24 and 100 hours
of operation. Allowing belts to operate
Premium RB (Texaco, Inc.) ● When belts have had time to seat with improper tension will shorten belt
in the sheave grooves, readjust belt
Alvania No. 2 (Shell Oil Company) tension. Check belt tension after 8, 24 life substantially.
and 100 hours of operation. ● If the shafts become scratched or
FREQUENCY OF LUBRICATION marked, carefully remove the sharp
The bearings are lubricated at BELT DRIVE ASSEMBLY CAN BE edges and high spots such as burrs
predetermined intervals and the condition MOUNTED AS FOLLOWS: with fine emery cloth or a honing
of the grease established as it is purged out ● Clean motor and drive shafts. Be stone. Avoid getting emery dust in the
of the seals or by examination of the grease sure they are free from corrosive bearings.
in the housing. An average installation material. Clean bore of sheaves and ● Do not apply any belt dressing unless
where the environmental conditions are coat with heavy oil for ease of shaft it is recommended by the drive
clean and room temperatures prevail may entry. Remove oil, grease, rust or manufacturer. Belts are designed for
only require bearing lubrication every burrs from sheaves. Place fan sheave frictional contact between the grooves
3 to 6 months, while operation in a dirty on fan shaft and motor sheave on its and sides of the belts. Dressing will
atmosphere at high temperatures will shaft. DO NOT POUND ON sheave reduce this friction.
require much more frequent intervals. as it may result in damage. Tighten
Base your particular interval on condition sheaves in place. ● Minimum belt center distances are
of grease after a specific service period. ● Move motor on base so belts can be available from factory upon request.
The following chart is intended as a placed in grooves of both sheaves ● Belt tension on an adjustable pitch
guideline for your consideration. (Figure 1) without forcing. Do not roll belts or use drive is obtained by moving the motor,
tool to force belts over grooves. not by changing the pitch diameter
of the adjustable sheaves.
Figure 1: Frequency of Lubrication
Disassembly of Fan
OPERATING SPEED (RPM) Before removing any equipment, the fan's
SHAFT SIZE 500 1000 1500 200 2500 3000 3500 4000 450 5000 power source should be locked "off" for
personal safety. The position of mating
LUBRICATION FREQUENCY (Months) parts such as bearing, drive, etc., should
be marked in their relative position for
.50" - 1.00" 6 6 6 6 6 6 4 4 2 2 simplifying assembly.
1.06" - 1.44" 6 6 6 6 6 6 4 4 2 1 1. Remove all safety guards.
1.50" - 1.75" 6 6 6 4 4 2 2 2 1 1 2. Disconnect ducting or supports to
1.88" - 2.19" 6 6 4 4 2 2 1 1 1 remove fans.
3. Remove drive cover plate to provide
2.25" - 2.44" 6 4 4 2 2 1 1 1 access to inner housing for Arr. 9 fans.
2.50" - 3.00" 6 4 4 2 1 1 1 4. Remove drive from fan.
3.06" - 3.50" 6 4 2 1 1 1 5. Clean off the shaft, removing dirt and
3.56" - 4.00" 6 4 2 1 1 burrs and lubricate with oil for bearing
and wheel removal.
BELT DRIVES ● Align fan and motor shafts so they are 6. Loosen setscrews on pillowblock
Fans shipped completely assembled have parallel. The belts should be at right bearing and remove the bearings
had the belt drive aligned at the factory. angles to the shafts. A straight edge (Arr. 9 fan only). Bearing bars should
Alignment must be checked before or taut cord placed across the faces be checked with straightedge to
operation. of the sheaves will aid in alignment determine if the bar has a crown, and
● Be sure sheaves are locked in with single groove sheaves. If multiple bearings shimmed accordingly when
groove sheaves are installed, use
assembled.
position. the center line of the drive as your
● Key should be seated firmly in alignment point. Assembly of Fans
keyway. ● Tighten belts by sliding motor in its To reassemble fan, reverse the process
● The motor and fan shafts must be base. Correct tension gives the best as listed above. Care should be taken
properly aligned, with the center line efficiency. Excessive tension causes once the fan is reassembled to assure
of the belts at a right angle to the undue bearing pressure. components are firmly fastened and

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