General Instructions
INSTALLATION, OPERATION & MAINTENANCE MANUAL
IM-3000
August 2014
Introduction
DO NOT INSTALL, USE OR OPERATE THIS EQUIPMENT UNTIL THIS MANUAL HAS BEEN READ AND UNDERSTOOD.
READ AND SAVE THESE INSTRUCTIONS FOR FUTURE USE.
The purpose of this manual is to aid in the proper installation and operation of fans supplied by Twin City Fan
Companies, Ltd. These instructions are intended to supplement good general practices and are not intended to cover
detailed instruction procedures because of the wide variety and types of fans manufactured by Twin City Fan
Companies, Ltd.
It is the responsibility of the purchaser to assure that the installation and maintenance of this equipment is handled
by qualified personnel experienced in such work and equipment.
Contact your local representative should you need further information.
Shipment and Receiving
Prior to shipment, all fans have been thoroughly inspected and tested.
All equipment shipped from Twin City Fan Companies, Ltd. is boxed or crated to fully comply with trucking requirements. Inspect all shipments carefully for damage. THE RECEIVER MUST NOTE ANY DAMAGE ON THE CARRIER’S
BILL OF LADING AND FILE A CLAIM IMMEDIATELY WITH THE FREIGHT COMPANY IN THE CASE OF ANY DAMAGE.
Keep a record of all equipment received including inspection details and date of receipt due to the possibility of
partial shipments.
If you receive damaged goods, contact your sales or factory representative for repair or replacement service.
Handling
Handle your equipment with caution. Some fans are provided with lifting lugs or holes for easy handling. Others must
be handled using nylon straps which protect the fan’s coating and housing. Spreader bars should be used when
lifting large parts.
Fans should be lifted by using straps around the fan housing only. DO NOT LIFT FANS BY THE MOTOR, MOTOR
BASE, PROP OR FLANGES.
Roof ventilators should be lifted by using straps around the fan housing or base only. Spreader bars should also be
used to avoid damage to stack caps or hoods. DO NOT LIFT ROOF VENTILATORS BY THE STACK CAP OR HOOD.
On hooded units, disassemble the stack from hood when lifting. Upblast models may be lifted assembled.
Storage
If fans are stored for any length of time, they should be stored in a clean, dry location to prevent rust and corrosion. Outdoor storage is not recommended. When outdoor storage is necessary, fans should be protected from the
elements as completely as possible. Cover fan inlets and outlets and keep motors dry and clean.
For extended storage (more than 3 months) motor shafts and bearings should be rotated monthly. If stored longer
than 6 months, bearing grease in the motor and fan should be purged and replaced with compatible grease. Re-check
belts for proper tension. Storage records should be kept to assure proper maintenance. The factory can advise warranty centers to provide motor and bearing service if needed.
©2009 Twin City Fan Companies, Ltd.
Installation
Roof ventilators should always be mounted to a flat,
level, solid and rigid structure. Particular caution should
be exercised when installing fans on metal buildings. Be
sure wall or roof is capable of supporting the fan(s).
Fans mounted on walls or roofs and not supported correctly will cause vibration that could cause damage or
injury.
Fans mounted off ground level should be rigidly mounted to a structural platform and be placed over or as
near as possible to a solid wall or column.
Support for suspended fans must be cross-braced for
live load support to prevent side sway.
Use guy wires to help secure roof units if excessively
windy conditions prevail.
1. CAUTION! This fan contains rotating parts and
requires electrical service. Appropriate safety precautions should be taken during installation, operation
and maintenance.
2. WARNING! Do not install or operate this fan in an
environment or atmosphere where combustible or
flammable materials, gases or fumes are present
unless it was specifically designed and manufactured for use in that environment. Explosion or fire
can result. Explosive, corrosive, high temperature, or
other extreme conditions may require special construction, inspection and maintenance. It is necessary to observe the fan manufacturer’s recommendations and limitations concerning the type of material to be handled by the fan and its application to
special conditions.
3. When the roof ventilator is designed to be mounted
on a curb, the curb should be securely installed
prior to fan installation.
4. A damper, if used, should be securely mounted
within the curb or wall in a manner which allows
free and unobstructed operation.
5. CAUTION: All electrical work must be done in accordance with local and/or national electrical codes as
applicable. If you are unfamiliar with methods of
installing electrical wiring, secure the services of a
qualified electrician.
6. WARNING: This product must be grounded.
7. DANGER! Make sure power is turned off and locked
in the OFF position at the service entrance before
installing, wiring or servicing the fan.
8. CAUTION! Before wiring the motor, check the supply
voltage against the motor nameplate voltage. High
or low voltage can damage the motor and void the
motor warranty. See Table 1.
Table 1. Utilization Voltages
SYSTEM VOLTAGE/ UTILIZATION VOLTAGE
UNIT NAMEPLATE MIN. MAX.
115/60/1 104 127
208-230/60/1 or 208-230/60/3 187 253
230/60/1 or 230/60/3 207 253
277/60/1 249 305
200/60/3 180 220
380/60/3 342 418
460/60/3 414 506
575/60/3 517 633
110/50/1 99 121
220/50/1 198 242
380-415/50/3 342 456
440/50/3 396 484
9. On three-phase units check and calculate phase
unbalance as follows:
% Voltage Unbalance = 100 x max. voltage deviation
from avg. voltage ÷ avg. voltage
How To Use The Formula:
With voltages of 220, 216 and 213
a. Avg. Voltage = 220 + 216 + 213 = 649 ÷ 3 = 216
b. Max. Voltage Deviation From Avg. Voltage =
220 – 216 = 4
c. % Voltage Unbalance = 100 x (4 ÷ 216) = 1.8%
Voltage unbalance should not exceed 2%.
10. WARNING! Be sure to keep all wiring clear of rotat-
ing or moving parts.
11. WARNING! Before starting the fan, turn the wheel
to assure it rotates freely. If needed, adjust the
wheel/shaft/bearing/motor position as required to
achieve necessary clearances.
12. On belt driven units, assure belts are tensioned and
aligned properly. See Maintenance section.
13. Check all setscrews and keys. Tighten as necessary
prior to fan startup.
14. On roof units, anchor the fan securely to the curb.
Anchoring through the vertical portion of the curb
cap flange is recommended. Use a minimum of four
lag bolts or other suitable fasteners.
15. As with most installations of rotating machinery, due
to the nature of their applications, most fans are
available with protective guards and/or other devices
for required operating safety. Before operating the
unit in any of its applications, determine requirements for any guards and/or devices needed for
protection against accidental contact with moving
parts or against injury to nearby personnel or equipment due to accidental rupture of fast moving
parts.
Check, Test and Start Procedure
1. Disconnect power to this unit before servicing the
unit. Make sure power is turned off and locked in the
OFF position.
2. Tighten all bolts and setscrews securely and, on belt
driven fans, check sheave alignment and belt tension.
Tighten belts if necessary. NOTE THAT ALL BOLTS,
SETSCREWS AND BELTS SHOULD BE CHECKED
AND TIGHTENED AFTER TWO DAYS OF INITIAL
OPERATION.
2 Twin City IM-3000
3. Clearance should be checked all around between
wheel or propeller tips and the housing before starting up. The wheel or propeller should not strike the
housing.
No initial lubrication is required. Motors and fan bear-
ings have been prelubricated by the motor manufacturer.
4. Apply power to the unit and check the rotation of the
wheel with the directional arrow on the unit.
WARNING: Especially check three-phase units for rotation.
For three-phase, rotation can be changed by interchanging any two of the three line leads. If the unit is checked
on temporary wiring, it should be rechecked when permanently installed. Motor burn-out or tripped overload
protection devices are usually the result of wrong rotation.
5. Electrical Input Check: Perform check of fan ampere
draw and verify that motor nameplate amps are not
exceeded. Take account of the service factor range if
motor is nameplated above a 1.0 service factor.
Table 2. Maximum Fan RPM (Belt Driven Units)
MODEL MOTOR HP
FAN RPM
1B, 2B, 3B 1/4 1680
12FA 4B 1/3 1465
5B 1/2 1675
1B, 2B, 3B 1/4 1470
14FA 4B 1/3 1620
5B 1/2 1850
1B, 2B 1/4 905
18FA 3B 1/3 995
4B 1/2 1140
1B, 2B 1/4 570
3B 1/3 625
24FA 4B 1/2 720
5B 3/4 820
6B 1 905
1B 1/3 440
2B 1/2 500
3B 3/4 575
30FA
4B 1 630
5B 1
6B 2 795
1B 1/2 370
2B 3/4 425
3B 1 465
36FA
4B 1
5B 2 585
6B 3 670
1B 1/2 320
2B 3/4 370
3B 1 405
40FA 4B 1
5B 2 510
6B 3 585
7B 5 690
MAXIMUM
1
⁄2 725
1
⁄2 535
1
⁄2 465
6. Fan RPM Check: Fan RPM should be checked and
verified with a tachometer. Refer to Table 2 for maximum fan RPM values.
The fan should not need balancing, as it was balanced
at the factory to be within stringent vibration levels
before shipment. However, there are several things that
may cause vibration such as rough handling in shipment
and erection, weak foundations and alignments.
MODEL MOTOR HP
FAN RPM
1B, 2B, 3B 1/4 1420
14WA 4B 1/3 1560
5B 1/2 1790
1B, 2B 1/4 900
18WA 3B 1/3 990
4B 1/2 1135
1B, 2B 1/4 560
3B 1/3 615
24WA 4B 1/2 705
5B 3/4 810
6B 1 890
1B 1/3 435
2B 1/2 500
3B 3/4 575
30WA
4B 1 630
5B 1
6B 2 790
1B 1/2 365
2B 3/4 420
3B 1 460
36WA 4B 1
5B 2 580
6B 3 660
7B 5 785
1B 1/2 315
2B 3/4 360
3B 1 395
4B 1
40WA
5B 2 495
6B 3 570
7B 5 675
8B 7
MAXIMUM
1
⁄2 720
1
⁄2 525
1
⁄2 450
1
⁄2 765
Maintenance
1. Before performing any maintenance on the fan, be
sure power is turned off and locked in the OFF
position at the service entrance.
2. Ventilators should be carefully checked at least once
a year. For critical or rugged applications, a routine
check every two or three months is suggested.
3. All motors supplied with Twin City Fan & Blower
ventilators carry a one-year warranty from date of
shipment. For repairs within the warranty period, the
motor must be taken to the motor manufacturer’s
authorized service dealer. Contact your representative for additional warranty details.
4. A periodic motor check should consist of spinning
the motor shaft with the power off to be sure the
motor turns freely and the bearings run smoothly.
The belt on belt driven units should be removed
from the motor sheave.
5. When removing or installing a belt, do not force the
belt over the sheave. Loosen the motor mount so
that the belt can be easily slipped over the
sheave.
Twin City IM-3000 3
6. The belt on belt driven units should be removed and
carefully checked for glazing, cracks, ply separation
or irregular wear. A small irregularity in the contact
surface of the belt will result in noisy operation. If
any of these defects are apparent, the belt should
be replaced. Check the sheaves also for chipping,
dents or rough surfaces which could damage the
belt.
7. The correct belt tension is important. Too tight a
belt will result in excess bearing pressure on the
motor bearings and shaft pillow blocks and may
also overload the motor. Too loose a belt will result
in slippage which will quickly “burn” out belts. A
belt should feel “live” when thumped, approximately
1
⁄4" belt deflection (3 to 5 lb.) when subject to finger
pressure at midpoint between sheaves.
8. The belt alignment should also be checked to be
sure the belt is running perpendicularly to the rotating shafts. Motor and drive shafts must be parallel.
Improper alignment will result in excessive belt wear.
9. Check sheave setscrews to ensure tightness. Proper
keys must be in keyways.
10. Do not readjust fan RPM. If sheaves are replaced,
use only sheaves of identical size and type.
11. If the unit is to be left idle for an extended period,
it is recommended that the belts be removed and
stored in a cool, dry place to avoid premature belt
failure.
12. The standard pillow block bearings on belt driven
ventilators are factory lubricated and are provided
with external grease fittings. Relubrication annually
or more frequently is recommended. See Table 3.
Do not over-grease. Use only 1 or 2 shots of
recommended lubricant with a hand gun in most
cases. See Table 4. The maximum hand gun rating
is 40 P.S.I. Rotate bearings during lubrication where
good safety practice permits.
CAUTION: Greases of different soap bases (lithi-
um, sodium etc.) may not be compatible when
mixed. Prevent such intermixing by completely purging the bearing of old greases.
The most frequent causes of bearing failure are
not greasing often enough, using an excessive
quantity of grease, or using incompatible greases.
Excessive vibration, especially if the bearing is not
rotating, will also cause bearings to fail. Bearings
must also be protected from water and moisture to
avoid internal corrosion.
13. During the first few months of operation it is recommended that the setscrews be checked periodically
to assure they are tight.
14. The rotating wheel requires particular attention since
materials in the air being handled can build up on
the blades to cause destructive vibration or weaken
the structure of the wheel by corroding and/or eroding the blade metal. Regular inspection and corrective action at intervals determined by the severity of
each application are essential to good service life
and safety.
Table 3. Suggested Fan Bearing Greasing Intervals
INTERVAL
(MONTHS)
12 to 18 Infrequent operation or light duty in clean atmosphere.
6 to 12 8 to 16 hrs./day in clean, relatively dry atmosphere.
3 to 6 12 to 24 hrs./day, heavy duty, or if moisutre is present.
moisture laden atmosphere; vibration.
Heavy duty in dirty, dusty locations; high ambient temps;
1 to 3
TYPE OF SERVICE
Table 4. Grease Manufacturers
MANUFACTURER GREASE (NLGI #2)
Shell Gadus S2 V100 2
Exxon/Mobil Ronex MP
V-Belts
V-belts on these belt driven fans are oil, heat, and static
resistant type and oversized for continuous duty. With
proper installation and maintenance, years of operating
efficiency can be added to the lifespan of the V-belt
drive.
The condition of the V-belts and the amount of belt tension should be checked prior to startup (see Figure 1).
When it becomes necessary to adjust belt tension, do not
over-tension as bearing damage will occur. Recommended
belt tension should permit
1
⁄64" deflection per inch of the
span of the belt at the center of the belt span. To find
this point, measure halfway between the pulley centerlines
as shown in Figure 2. Extreme care must be exercised
when adjusting V-belts as not to misalign the pulleys. Any
misalignment will cause a sharp reduction in belt life and
will also produce squeaky, annoying noises (see Figure
3). On units equipped with 2 or 3 groove pulleys, adjustments must be made so that there is equal tension on
all belts (see Figure 4).
1. Where tensioning rods are not provided, adjustment is
more easily obtained by loosening and adjusting one
side of the motor bracket at a time.
2. Always loosen tension adjustment enough to place
belts on sheaves without running belts over the edge
of either sheave. A new belt may be seriously damaged internally by careless handling (see Figure 5).
WARNING: When removing or installing belts, never force
belts over pulleys without loosening the motor first to
relieve belt tension. The fan has been checked for
mechanical noises at the factory prior to shipment. If
mechanical noise should develop, some suggestions are
offered here as a guide toward remedying the cause.
1. Check rotating members for adequate clearance.
2. Check proper belt tension and pulley alignment.
3. Check installation and anchoring.
4. Check fan bearings.
4 Twin City IM-3000
Figure 1. Eliminate Slack Figure 2. Belt Deflection
Belt Span
Slack belts wear excessively,
cause slippage and deliver less
power. For longest belt life,
always provide proper tension.
Deflection
Deflection =
Belt Span
64
Figure 3. Alignment Figure 4. Two-GrooveSheaves
NOT THIS
Two-groove variable pitch
Mount belts straight. Shafts
must be parallel and sheaves in
alignment to prevent unnecessary belt wear.
sheaves must be opened the
same number of turns on both
sides; otherwise, slippage
occurs, wearing belts rapidly.
Figure 5. Belts
Don’t force belt. Forcing the
belt will break the cords and
cause belt failure.
Bearing Replacement
Fan bearings on belt driven fans should not need to be
replaced for many years if the previous recommendations are strictly adhered to. However, use the following
procedure when bearing replacement is necessary.
1. Gain access to the fan bearings. Remove the bearing cover, if any.
2. Loosen the belts by shifting the motor.
3. Remove the propeller or wheel and disconnect the
remote lube tubes (if applicable).
4. Measure the location of the bearing to the propeller
or wheel end of the shaft and the bearing spacing.
5. Remove the shaft and bearing assembly. Note the
position of the bearings’ shims (if applicable).
6. Loosen all bearing/shaft setscrews or other locking
devices.
7. Remove bearings (may have to be pressed off the
shaft).
8. Polish the shaft with fine emery paper (240 grit or
finer) and file the setscrew dimples left on the shaft
flat.
9. Install new bearings on the shaft, making sure that
the collars are together (i.e. facing each other on
the shaft). Lightly seat one setscrew or eccentric
locking collar on each bearing to hold in the approximate marked position.
10. Mount the shaft/bearing assembly in the fan with
bolts. Do not tighten yet. Just snug up. Loosen the
setscrew.
11. Center the shaft in the housing (both ends) as
closely as possible. (The fan propeller or wheel may
need to be temporarily installed to get its clearances equal.)
12. Tighten the bearing mounting bolts.
13. Reinstall the lube tubes (if applicable).
14. Install bearing cover, propeller and belts and adjust
the motor to get proper belt tension. Also, make
sure that the sheaves are properly aligned.
15. If a new shaft is supplied, ignore items #6 through
#8.
Motors
Twin City Fan & Blower recommends periodic checks of
voltage, frequency and current of a motor while in
operation. Such checks assure the correctness of frequency and voltage applied to the motor, and yield an
indication of the fan load. Comparison of this data with
previous data will give an indication of the fan performance. Any serious deviations could indicate a potential
motor failure.
All motors have prelubricated sealed bearings and are
lubricated for the life of the motor.
1. All motors carry a one-year warranty from date of
shipment. For repairs within the warranty period, the
motor must be taken to the motor manufacturer’s
authorized service dealer. Contact your representative
for additional warranty details.
2. A periodic motor check should consist of spinning the
motor shaft with the power off to be sure the motor
turns freely and the bearings run smoothly. The belt
on belt driven units should be removed from the
motor pulley.
Repair or replacement of motors is normally performed
by a repair station authorized by the manufacturer.
Contact your representative or the factory for locations
nearest you. DO NOT ship motor to the factory without
specific authorization forms.
Twin City IM-3000 5
Fan Troubleshooting Chart
PROBLEM POSSIBLE CAUSES
EXCESSIVE VIBRATION 1. Wheel or sheaves loose on shaft.
2. Belts too loose or too tight.
3. Out of balance wheel.
4. Excessive buildup of dirt/dust on wheel.
5. Bent shaft.
6. Weak mounting base for fan.
7. Fan mounting bolts loose.
8. Loose or worn bearings.
9. Bearing or drive misalignment.
10. Mismatched belts.
11. Structures not cross-braced (wall fans).
12. Curb not flat and level.
EXCESSIVE HORSEPOWER 1. Wheel rotating in wrong direction.
2. Fan speed higher than design.
3. Wheel rubbing on inlet venturi.
4. Worn fan bearings.
TOO LITTLE AIR 1. Restricted fan inlet or outlet.
2. Wheel rotating in wrong direction.
3. System is more restrictive (more static pressure) than expected.
4. Fan speed lower than design.
5. Inlet or outlet screens clogged.
6. Dampers or shutters not opening.
TOO MUCH AIR 1. Fan speed higher than design.
2. System is less restrictive (less static pressure) than expected.
FAN DOES NOT OPERATE 1. Wrong voltage.
2. Electricity turned off or not wired properly.
3. Loose pulleys.
4. Blown fuses.
5. Tripped overload protector.
6. Broken belts.
EXCESSIVE NOISE 1. Wheel or sheaves loose.
2. Bearing or drive misalignment.
3. Accumulation of material on wheel.
4. Worn or corroded wheel.
5. Wheel out of balance.
6. Wheel hitting housing.
7. Bent shaft.
8. Bearings need lubrication.
9. Loose bearing bolts.
10. Loose or worn bearings.
11. Mismatched belts.
12. Belts too loose or too tight.
13. Belts oily or dirty.
14. Belts worn.
15. Loose fan mounting bolts.
16. Rattle of components in high velocity airstream.
17. Electrical noise.
18. Noise from high velocity air system.
19. Vibrating parts not isolated from building.
20. Vibrating ductwork.
It is recommended that the users and installers of this shipment familiarize themselves with AMCA Publication #201,
“Fans and Systems” and publication #202, “Troubleshooting” which are published by Air Movement and Control
Association, 30 West University Drive, Arlington Heights, Illinois 60004.
6 Twin City IM-3000
Limitation of Warranties and Claims
Seller warrants to the original purchaser that the goods
sold hereunder shall be free from defects in workmanship and material under normal use and service (except
in those cases where the materials are supplied by the
buyer) for a period of one year from the date of original
installation or eighteen (18) months from the date of
shipment, whichever occurs first. The liability of seller
under this warranty is limited to replacing, repairing, or
issuing credit (at cost, F.O.B. factory and at seller’s
discretion) for any part or parts which are returned by
buyer during such period provided that:
a. seller is notified in writing within ten (10) days fol-
lowing discovery of such defects by buyer, or
within ten (10) days after such defects should reasonably have been discovered, whichever is less;
b. the defective unit is returned to seller, transportation
charges prepaid by buyer.
c. payment in full has been received by seller or said
products; and
d. seller’s examination of such unit shall disclose to its
satisfaction that such defects have not been caused
by misuse, neglect, improper installation, repair,
alteration, act of God, or accident.
No warranty made hereunder shall extend to any seller
product whose serial number is altered, effaced or
removed. Seller makes no warranty, express or implied,
with respect to motors, switches, controls, or other
components of seller’s product, where such components
are warranted separately by their respective manufacturers. THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL
OTHER WARRANTIES, EXPRESS OR IMPLIED, WHETHER
STATUTORY OR OTHERWISE, INCLUDING ANY IMPLIED
WARRANTY OF MERCHANTABILITY OR FITNESS FOR
A PARTICULAR PURPOSE. In no event shall seller be
liable to buyer for indirect, incidental collateral, or consequential damages of any kind. (BUYER’S FAILURE TO
PAY THE FULL AMOUNT DUE WITHIN SIXTY (60) DAYS
OF DATE OF INVOICE SHALL OPERATE TO RELEASE
SELLER FROM ANY AND ALL LIABILITY OR OBLIGATION
ARISING PURSUANT TO ANY WARRANTY, EXPRESS
OR IMPLIED, WHETHER STATUTORY OR OTHERWISE,
INCLUDING ANY IMPLIED WARRANTY OR
MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE, MADE IN CONNECTION WITH ANY
CONTRACT FORMED HEREUNDER. BUYER AGREES
THAT SUCH FAILURE TO PAY SHALL CONSTITUTE A
VOLUNTARY WAIVER OF ANY AND ALL SUCH
WARRANTIES ARISING PURSUANT TO SUCH CONTACT.)
Twin City IM-3000 7
TWIN CITY FAN & BLOWER | WWW.TCF.COM
5959 Trenton Lane N | Minneapolis, MN 55442 | Phone: 763-551-7600 | Fax: 763-551-7601
1MPP11/09
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