AAF AmericanAirFilter K Manual

Better Air is Our Business ®
Table of Contents
1.0 Inspection
2.0 Lifting
3.0 Storage
4.0 Installation
4.1 Installation Procedures for Standard A,B,C, and D
Section V-Belt Drives
5.0 Operation Start p
6.0 Maintenance
7.0 Bearings
8.0 Impeller Removal and Installation
9.0 Split Taper Bushings
9.1 Removal
9.2 Installation
10.0 Spare Parts and Service
11.0 Troubleshooting Guide
Type K Exhauster
Standard and High Pressure
Installation, Operation and Maintenance Instructions
AAF Type K Exhaus er, Arrangemen 1
AAF Type HPK Exhaus er, Arrangemen 1

2
1.0 Inspection
All equipment should be carefully inspected for damage when
received. Any shortage, damage, or breakage should be noted and a
claim filed immediately with the carrier. All AAF shipments are F.O.B.
factory.
2.0 Lifting
The Type K Exhauster is equipped with either lifting lugs or eyes. The
exhauster must NEVER be lifted by the shaft or housing. Caution
must be used during handling and mounting. Dropping the unit just a
few inches can imprint the bearing balls or rollers into the inner and
outer races. This will result in vibration and premature bearing failure.
3.0 Storage
Type K Exhausters should be stored in a dry, protected area where
bearings, wheels, fan shaft motors, and starters are not exposed to
moisture, dust, or corrosion. If it is necessary to store the unit
outdoors, special care should be taken to eliminate the accumulation
of moisture, dust, and corrosive materials and other contaminants.
The motor, bearings, and shaft should be covered with a protective
lubricant and/or weather resistant cover.
In addition, “Puddle Corrosion” may occur within a bearing when
water from moisture laden air comes in contact with the unprotected
steel surfaces of the bearing races. Water collects in voids caused by
the lubricant level dropping.
Grease-lubricated bearings should be re-lubricated upon arrival at the
storage site, and periodically during storage. The impeller should be
manually rotated and the bearings greased at frequent intervals,
depending on the environment, but normally every 4–6 weeks of the
storage period should be sufficient.
4.0 Installation
1. Remove any protective covering on the bearings and motor shaft,
and remove shipping skids.
2. The exhauster should be mounted on a flat, level, rigid foundation.
If vibration isolators are used, a sub-base must be used to support
the exhauster with the isolators located at each corner of the sub-
base. Connecting ductwork requires flexible connections when
vibration isolators are used.
3. Carefully line up unit with the anchor bolts in the foundation and
shim if necessary for leveling. Secure the exhauster in place by
tightening all nuts on anchor bolts.
Where ground support is not feasible, overhead support is possible.
The foundation can be hung from suspension rods, or, where
conditions permit, the exhauster can be rotated 180° and bolted.
However, the same precautions must be taken in order to ensure the
fan is level and securely fastened to the support.
4.1 Installation Procedures for Standard A, B, C, and D Section
V-Belt Drives*
Step 1: The K Exhauster is supplied with drives of various
manufacturers. Detailed installation instructions supplied by the
manufacturers are included in the instruction envelope.
Step 2: After placing the set of matched belts in the sheave grooves,
take up the slack in the belts and start the drive. Tension the drive
until the belts have only a slight bow in the slack side of the drive
while it is operating under load.
Step 3: Stop the drive and measure the belt span (see sketch on the
following page). Using a spring scale, apply a force to any one of the
belts in the center span. The force should be perpendicular to the
span and toward the center of the drive. easure the force required to
deflect any one of the belts 1/64 inch for every inch of span length. For
example, the deflection of a 32 inch span would be 1/64 inch multiplied
by 32, or 1/2inch.
Step 4: The amount of force required to deflect the belt should
compare with the recommended values listed in the table on the
following page. Initially, you should tighten the belts to the values
listed in Column A. There will normally be a drop in tension during the
first 24 to 48 hours of operation. During this “run-in” period, the belts
seat themselves in the sheave grooves, and the initial stretch is
removed. After a day or two, the drive should be stopped again and
another check made for the correct amount of tension. The tension
should now compare with the values in Column B. If the force is
below the low value in Column B, the belts are too loose and should
be tightened. If the force is greater than the high value in Column B,
the bolts should be loosened so that the force is between the high
and low value in Column B.
5.0 Operation Start Up
1. Insure wheel is tight on shaft and the foundation bolts, sheaves,
and bearings are secured.
2. Turn fan rotor manually to insure there is no rubbing or binding.
3. ake certain the rotation of the fan wheel is the same as that
indicated on the fan housing.
4. After exhauster has operated for a few hours, retighten all bolts.
5. V-belt drives should be checked to determine if proper alignment
and belt tension are correct. All V-belt drives require an initial run-in
period during which initial stretch is removed from the belt and
seating of the belts in grooves takes place. To compensate for this
loss in tension, the drive is installed with greater tension than
required for normal operation.
6. See planograph 88P-108381. Remove one for correct lubrication
system. After bearing equilibrium temperature has been reached,
adjust the lubrication system as required.
*For belts other than standard A, B, C or D section, see manufacturer’s
instructions included with drive.

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6.0 Maintenance
1. A time schedule should be established for inspection of rotating
parts in the exhauster. The frequency of inspection must be
determined by the severity of operation and the locality.
Proper bearing lubrication is of major importance in the continued,
efficient operation of the AAF Type K Exhauster. Generally, the
following should be taken into consideration when lubricating fan or
motor bearings.
a. A reasonable periodic lubrication schedule should be instituted
after some maintenance experience on the unit is gained.
Frequency of lubrication will depend upon air temperature,
amount of dust in the air, and moisture or corrosive content of
the environment.
b. The proper type lubricant should be particularly noted. See
specific instructions in service envelope. The factory grease is
Chevron SRI #2 or equal.
c. Care should be taken not to over lubricate the bearing as this will
cause high temperature operation. When lubricating bearings
with a pressure grease gun, care should also be taken so
bearing seals are not damaged.
2. Housing and wheel should be inspected periodically, through the
inspection door, for wear and possible accumulation of dust.
Various methods of cleaning may be employed depending on the
particular installation.
Two most common methods are:
a. Steam, water, or air under high pressure.
b. anual wire brush cleaning or scraping.
This cleaning is necessary where dust has accumulated to
prevent unbalanced conditions. Precautions should be taken to
make sure bearings and motor are protected when any high
pressure method of cleaning is used.
All bolts should be periodically inspected and tightened.
Force
Deflec ion
Bel Span
3. Belt Driven Units—V-belt drives should be checked on a regular
basis to determine if proper alignment and tension are being
maintained. It is recommended that belts be replaced in matched
sets when necessary.
7.0 Bearings
The Type K Exhauster is furnished with a variety of bearings
depending upon type duty, size, RP , etc. Detailed information on the
specific bearings furnished is supplied in the service and installation
envelope attached to the exhauster at shipment. It is important that
identical bearings be used when replacement is required. (Note: The
shaft should be inspected for damage before installing new bearings.
It is often economical to replace the shaft when installing new
bearings.)
Type K Exhausters using 15/16" and larger bearings are normally
supplied with one fixed and one floating bearing. A slight improvement
in bearing life is normally achieved by keeping the fixed bearing on
the outboard position.
8.0 Impeller Removal and Installation
To remove the impeller, it is necessary to first remove the front plate.
All K Exhausters are furnished with split taper hubs and bushings.
Remove the hub and bushing according to the following directions.
The impeller can then be removed through the inlet side of the scroll.
Installation is the reverse of removal.
Bel Deflec ion Force
Deflection Force (lbs.)
Small Sheave AB
Belt Diameter “Run-in” Period Normal Period
3V 2.65 to 3.35 6 3 to 41/2
4.75 to 6.00 8 4 to 6
5V 7.1 to 9.00 16 8 to 12
12.5 to 16.00 20 10 to 15
8V 18.0 to 22.4 40 20 to 30

Type K Exhauster
AAF has a policy of continuous product research and
improvement and reserves the right to change
design and specifications without notice.
10300 Ormsby Park Place Suite 600
Louisville, Kentucky 40223-6169
www.aafintl.com
Customer Service 800.477.1214
Fax [phone]
ISO Certified 9001:2000
©2008 AAF International
The USGBC ember logo is a trademark owned by the
U.S. Green Building Council and is used by permission.
APC-3-531E OCT ‘08
Shaf
Shaf Assembly
Fron Bearing
Assembly
Exhaus er Back Shee
Taper Lock Bushing Hub Cap
Se Screws
Key
Taper Lock Hub
Disc Pla e
11.0 Troubles ooting
Guide
Problem
Excessive vibration
Possible Causes
Impeller imbalance—Check for
dust build-up, wear, or missing
balance weight.
Bent shaft—Replace shaft.
Worn or defective
bearings—Replace.
Loose impeller or
sheave—Adjust.
Incorrect operating
range—Review and adjust
as necessary.
Problem
Frequent Bearing failure
Possible Causes
Improper or infrequent
lubrication—Lubricate per
manufacturer’s directions.
Lubricant contamination—Clean
bearings and relubricate.
Fan imbalance—See above.
Drive belts too tight—Adjust
belts per directions.
10.0 Spare Parts and
Service
Spare parts may be ordered
from your nearest American Air
Filter representative or direct
from the factory. In ordering, it is
important that the part name
and serial number be shown on
the order. It is suggested that the
following spare parts be kept on
hand under normal operating
conditions.
1. Bearings
2. V-belts
Where operating conditions are
severe, continuous, critical,
foreign, or remotely located, the
following parts should also be
stocked:
1. Shaft
2. Impeller
Problem
Improper fan performance
Possible Causes
Worn impeller—Replace
impeller.
Incorrect RP — Adjust RP
Loose drive belts—Adjust belts.
System changes—Review
system for design changes,
obstructions, etc.
Incorrect direction of
rotation—Reverse direction
9.0 Split Taper Bus ings
9.1 Removal
1. Remove all screws. To
facilitate easier reinstallation,
oil should be applied to all
contact surfaces.
2. Insert screws in holes
threaded in bushing flange.
Tighten screws alternately
until bushing is loose in hub.
(Note: One screw will be
unused.)
9.2 Installation
1. Place bushing in hub. Place
screws loosely in holes
threaded on hub side shown
in diagram.
2. Place assembly on shaft and
locate in desired position.
3. Tighten screws alternately
until required torque is
obtained. Tap bushing and
retighten as required.