Acme Engineering AFSI Installation Manual

FORM 613100

Read and Save These Instructions

INSTALLATION & MAINTENANCE INSTRUCTIONS

Models AFSN, AFSL, AFSI, USAN, USAL, USAI

RECEIVING AND INSPECTION

Immediately upon receipt of a shipment, carefully inspect
for damage and shortage. Turn the impeller by hand to see
that it turns freely and does not bind. If any damage and/or
shortage is detected or suspected, the carrier must be
asked to conduct an inspection. The consignee’s
representative should not accept a shipment without a
notation on the delivery receipt indicating items not
delivered or the apparent extent of damage.

When a shipment is opened and damage is found which
was not evident externally (concealed damage), it is
mandatory that the consignee request an immediate
inspection by the carrier. Report any damage to the carrier
within 15 days. Failure to report damage within the above
time limit will result in rejection of a claim.

HANDLING

When handling fans and their accessories, always use
equipment and methods that will not cause damage. Fans
should be lifted using slings and padding or spreaders to
avoid damage.

CAUTION! Always make sure that all lifting and handling
equipment and techniques conform to current safety
standards.

Avoid lifting fans in a way that will bend or distort fan parts.
Never pass slings or timbers through the fan orifice.

CAUTION! Do not lift by the fan hood. Fans with special
coatings or paints must be protected in handling to prevent
damage.

STORAGE

Fans are protected against damage during shipment. If
they cannot be installedand put into operation immediately
upon receipt certain precautions are necessary to prevent
deterioration during storage. Responsibility for integrity of
fans and accessories during storage must be assumed by
the user. The manufacturer will not be responsible for
damage during storage. These suggestions are provided
solely as a convenience to the user, who shall make his
own decision as to whether to use any or all of them.

INDOOR: The ideal storage environment for fans and
accessories is indoors, above grade, in a low humidity
atmosphere which is sealed to prevent the entry of blowing
dust, rain, or snow. Temperatures should be evenly
maintained between 70°F and 105°F (wide temperature
swings may cause condensation and "sweating" of metal
parts). Windows should be covered to prevent

temperature variations caused by sunlight. Provide
thermometers and humidity indicators at several points
and maintain the atmosphere at 40% relative humidity, or
lower.

It may be necessary to use trays of renewable desiccant or
portable dehumidifier to remove moisture from the air in
the storage enclosure.

Thermostatically controlled portable heaters (vented to
outdoors) may be required to maintain even temperatures
inside the enclosure.

CAUTION! Provide fire extinguishers, or fire alarms, or
emergency response communication to protect building
and equipment against fire damage. Be sure that building
and storage practices meet all local, state and federal fire
and safety codes.

The following fans or accessories must be stored indoors,
in a clean dry atmosphere:

a. Propeller wall fans not in wall housings.
b. Any fan protected by a cardboard carton.
c. Motors dismounted from fans.
d. Spare wheels or propellers.
e. Belts, sheaves, bushings and other parts when

not mounted on fan.
f. Boxes, bags or cartons of hardware.
g. Curbs
h. Dampers

Remove any accumulations of dirt, water, ice or snow and
wipe dry before moving indoor storage. Allow cold parts to
reach room temperature to avoid “sweating” of metal parts.
Open boxes or cartons. Remove any accumulated
moisture; if necessary use portable electric heaters to dry
parts and packages. Leave coverings loose to permit air
circulation and to permit periodic inspection.

Rotate wheels or propellers by hand to distribute bearing
grease over the entire bearing surfaces.

Store at least 3 ½” off the floor on wooden blocks covered
with moisture proof paper or polyethylene sheathing.
Provide aisles between parts and along all walls, to permit
air circulation and space for inspection.

OUTDOOR: Fans designed for outdoor use maybe stored
outdoors, if absolutely necessary. The storage area
should be reasonably level and drained or ditched to
prevent accumulation of water. Fencing and lighting for
security are desirable. Roads or aisles for portable cranes

and hauling equipment are needed. Consider the use of
drift fencing to minimize accumulation of blowing snow or
dirt.

The following fans may be stored outdoors, if dry indoor
storage space is not available:

a. Fans intended for outdoor use that are crated in

wood.

b. Wall fans installed in wall housings.

All fans must be supported on wooden blocks or timbers
above water or normal snow levels. Provide enough
blocking to prevent settling into soft ground. Fans should
be set in place using the directional arrow markings on the
crate as a guide.

Locate pieces far enough apart to permit air circulation,
sunlight, and space for periodic inspection. Place all parts
on their supports so that rain water will run off, or to
minimize water accumulation. Do not cover parts with
plastic film or tarps-these cause condensation of moisture
from the air passing through heating and cooling cycles.

Fan wheels and propellers should be blocked to prevent
spinning caused by strong winds.

INSPECTION AND MAINTENANCE DURING STORAGE

Inspect fans and accessories at least once per month,
while in storage. Log results of inspection and
maintenance performed. A typical log entry should include
the following:

a. Date
b. Inspector’s Name
c. Name of Fan
d. Location
e. Condition of Paint or Coating
f. Is moisture present?
g. Is dirt accumulated?
h. Corrective steps taken?

If moisture or dirt accumulations are found on parts, the
source should be located and eliminated. Fans should be
rotated at each inspection by hand tento fifteen revolutions
to redistribute the motor and bearing lubricant.

If paint deterioration begins, consideration should be given
to touch-up or repainting. Fans with special coatings may
require special techniques for touch-up or repair.

Machined parts coated with rust preventive should be
restored to good condition promptly if signs of rust occur.
The most critical items are pulleys, shafts and bearing
locking collars. At the first sign of rusting on any of the
above parts, remove the original rust preventive coating
with petroleum solvent and clean lint-free cloths. Polish
any remaining rust from surfaces with crocus cloth or fine
emery paper and oil. Do not destroy the continuity of the
surfaces. Wipe clean with lint-free cloths and recoat
surfaces evenly and thoroughly with Tectly 506 (Ashland
Oil Company) or equal. For hard to reach internal surfaces
or for occasional use, consider using Tectly 511M Rust
Preventive or WD40 or equal.

REMOVING FROM STORAGE

As fans are removed from storage to be installed in their
final location, they should be protected and maintained in
similar fashion, until the fan equipment goes into
operation.

INSTALLATION

1.

CAUTION! This unit has rotating parts and safety
precautions should be exercised during installation,
operation and maintenance.

2.

WARNING! Do not use in hazardous environments
where the fan’s electrical system could provide
ignition to combustible or flammable materials,
unless the unit is specifically built for hazardous
environments.

3. If the fan manufacturers prefab curb is used, a flange
is provided for mounting the damper. Damper should
be installed before setting exhauster.

4. Using a minimum of eight (8) lag bolts - two (2) on
each side near corners, securely fasten fan to curb.
Fasten all bolts securely. The fan should rest on the
curb as level as possible.

5. If a damper box is being used, assemble box and
mount in curb before setting exhauster. Damper may
be installed at this time if desired. Damper should be
fastened to the bottom of the damper box, curb
flanges or nailing strips in the curb.

6.

Raise the unit to roof using a sling or platform; do not
lift by the hood.

7. See Figures 2 and 3 on pages 5 and 6 for exploded
views.

8. Access to the fan/motor compartment is required at
this time as follows:

Standard Hood Filtered

Air Supply

.

remove corner bracket
fasteners from curb panels
and lift off entire hood.

Louvered Filtered
Air Supply

.

remove Louver Hood top
with clips provided.

Side Intake Filtered
Air Supply

.

remove top from side
panels with clips provided.
The side intake duct, filters
and hardware are
shipped inside of the fan
plenum - remove for
installation. Install side
intake duct, filter rack
and filters with hardware
provided.

9. Turn the impeller by hand to make sure it rotates
freely.

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10. Motors 1 HP (.7457 kW) and below are shipped
mounted to the fan except for 1 HP (.7457 kW), 3 PH,
2 SPD/1 WDG motors. All other motors larger than 1
HP (.7457 kW) are not mounted for shipment - motors
are shipped in a separate carton. For Sizes 106
through 181, the motor mounting bar is located on the
fan housing. Size 200 units require a motor platform.
See Figure 1.

SIZES 106-181

MOTOR

MOTOR

MOUNTING

BAR

BELT

TENSIONER

NOTE: The motor is attached to the motor mounting bar with 2 bolts.

The belt tensioner uses 1 bolt.

SIZE 200

MOTOR

MOTOR

MOUNTING

BRACKET

MOTOR PLATE

NOTE: The motor is attached to the motor plate with 4 bolts.

The belt tensioner uses 1 bolt.

FIGURE 1

BELT

TENSIONER

11. Motor sheave is in a parts box along with the belts,
belt tensioner and hardware. The fan sheave is
mounted on the fan shaft.

12. The motor is attached to the motor mounting bar with
two (2) bolts, the belt tensioner uses one (1) bolt. By
turning the belt tensioning bolt counter-clockwise,
lower the motor to its lowest position (closest to the
fan assembly). Install the motor sheave on the motor
utilizing a straight edge to align the motor sheave with
the fan sheave. Once the sheaves are tightened in
place, install the drive belt over the sheaves and set
the tension by turning the belt tensioning bolt
clockwise. Proper belt tension is attained when the
belt depresses its own width when pressed firmly
inward at midway point between the sheaves. The
Size 200 motor platform can be adjusted with the two
(2) tensioning screws provided.

13. For optional Side Intake Filtered Air Supply Fans duct
extension, assembly is as shown in Figure 4 on Page

7.

14. For Side Intake Filtered Air Supply Fans, sizes 150,
181, and 200, the filter channels must be installed at
the job site. See Detail A in Figure 3.

15. Before proceeding further:
a) Make sure the electrical service to the fan is

locked in the “OFF” position.

b) All wiring must be in accordance with local

ordinances and the National Electric Code.

c)

WARNING! Check the voltage at the fan tosee if it
corresponds with the motor nameplate. High or
low voltage can seriously damage the motor.
Extra care should be taken when wiring two or
three speed motors since improper connections
will damage motor and void motor warranty.

16.

CAUTION! Guards must be installed when fan is
within reach of personnel or within eight (8) feet
(2.5m) of working level or when deemed advisable for
safety.

17. Apply power momentarily and compare the rotation of
the impeller with the directional arrow on fan.
WARNING! Operation in the wrong direction will
result deliver air but will overload the motor to the
extent of blowing fuses and seriously damaging the
motor. In the case of single phase motors, the
reversing instructions will appear on the wiring
diagram, located either in the motor wiring
compartment or on the outside of the motor housing.
In the case of three phase motors, the direction can
be changed by interchanging any two of the three
motor leads.

18.

WARNING! Do not operate fan at a static pressure
below that for which the fan was selected. If operated
at a static pressure below that specified, motor
overloading and burn-out will result.

Using an ammeter, measure the amperes actually
being drawn by the fan motor with the hood in place. If
the amp draw is greater than the service factor
amperes, reduce the fan RPM by opening the
variable speed drive on the motor shaft. See drive
charts on pages 8 and 9. Check the current again and
repeat if necessary.

19.

WARNING! Do not operate at speeds higher than
that cataloged for this equipment. Do not replace
motor pulley with a larger diameter pulley. Do not
replace the fan pulley with one smaller in diameter.
The pulley ratios are set so that the motor will not be
overloaded.

MAINTENANCE

1. Under normal usage, no spare parts are
recommended for one year of operation.
Recommended spare parts are shown on page 5 and

6.

CAUTION! Before proceeding, make sure electrical
service to fan is locked in “OFF” position.

Page 3

2. Impeller shaft bearings are pre-lubricated and sealed;
no service required.

WINDMILLING Even when the power supply is
locked out, fans may cause injury or damage if the
impeller is subject to “windmilling” which is the turning
of the impeller and drive components due to a draft in
the system. To guard against this hazard, the
impeller should be secured to physically restrict
rotational movement.

3. Motor bearings are pre-lubricated. Consult
information printed on motor for lubrication
instructions.

PROCEDURE FOR TIGHTENING SET SCREWS IN

BEARINGS AND HUBS

One Set Screw Application

Using a torque wrench, tighten the set screw to the torque
recommended in Table 1.

Two Set Screw Application

1. Using a torque wrench, tighten one setscrew to half of
the torque recommended in Table 1.

2. Tighten the second set screw to the full
recommended torque.

4. Check belt tension after first 48 hours of operation
and thereafter annually. Belt should depress its width
when pressed firmly inward at midway point between
the pulleys. Too much tension will damage bearings.
Belt should be tight enough to prevent slippage.
When replacing worn belt, replace motor pulley if
“shoulder” is worn in groove.

5. If impeller shaft bearings need replacement, replace
with bearings comparable to the original equipment.
If duplex split pillow block bearings are used, install
new bearings into neoprene rings, check correct
position of impeller with orifice, position bearings in
die-formed recess and tighten screws. Replace the
die-formed bearing cap and tighten the four bolts.

NOTE: If locking collar type bearing is used, collar
must first be positioned against inner race on the
bearing nearest impeller and turned in direction of
impeller rotation with drift pin and hammer until it
locks. Locking collars must be on inboard (facing)
sides of the bearings. Secure bearing to shaft with set
screws. Lock and secure other bearing to shaft in
same manner.

NOTE: If pillow block type bearings are used, slide
the bearings onto the shaft to desired location and
bolt bearing block securely to support base. Slide
shaft back and forth in secured bearing (do not drive
with hammer) and rotate to make certain it turns
freely. Check correct position of propeller with inlet
orifice. Then secure bearings to shaft by tightening
set screws.

3. Tighten the first set screw to the full recommended
torque.

Table 1. Recommended Tightening Torque

for Set Screws

Set Screw Diameter Torque (in-lbs)

#10 35

1/4 80

5/16 126

3/8 240

7/16 384

1/2 744

9/16 1080

5/8 1500

3/4 2580

7/8 3600

1 5400

VARIABLE FREQUENCY

DRIVES AND MOTORS

There are occasions when a Variable Frequency Drive
(VFD) will cause poor motor performance and possible
damage. To avoid these problems, Acme recommends
the following:

6. The washable air filters provided with this unit should
be cleaned if any decrease in air flow is noted.

7. Clean the inside of the unit and blower housing as
required to prevent heavy accumulations of dust and
oil.

SET SCREW TIGHTENING SCHEDULE

1. Before initial operation of the fan, tighten set screws
according to the procedure outlined below.

2. After 500 operating hours or three months, whichever
comes first, tighten set screws to the full
recommended torque.

3. At least once a year, tighten set screws to the full
recommended torque.

1. Select compatible motor and VFD converter; if
possible, the motor and the converter should be from
the same manufacturer or at least the converter
selected should be recommended by the motor
manufacturer.

2. A motor shaft grounding system should be used to
prevent motor bearing damage from eddy currents.

NOTE: The Company will not honor motor warranty
claims if the customer fails to follow these
recommendations.

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