Twin City ES-895 User Manual

TSL and QSL Inline Centrifugal

and Mixed Flow Fans

INSTALLATION, OPERATION & MAINTENANCE MANUAL

ES-895

August 2014

Introduction

This bulletin has been prepared to guide the users of
TSL Inline Centrifugal Fans and QSL Mixed Flow Fans
in the proper installation, operation and maintenance
procedures to insure maximum equipment life with
trouble-free operation.

Shipping and Receiving

All Twin City Fan & Blower products are carefully con­structed and inspected before shipment to insure the
highest standards of quality and performance. Compare
all components with the bill of lading or packing list to
verify that the proper unit was received. Check each unit
for any damage that may have occurred in transit. Any
damage should be reported immediately to the carrier
and the necessary damage report filed.

Handling

Handling of all air moving equipment should be con­ducted by trained personnel and be consistent with safe
handling practices. Verify the lift capacity and operating
condition of handling equipment. Maintain handling
equipment to avoid serious personal injury.
Units shipped completely assembled may be lifted
with slings and spreader bars. Use well-padded chains,
cables or nylon straps (see Figure 1). On most units,
lifting lugs are fashioned to protect the fan and fan
housing from damage. Never lift a fan by the inlet or
discharge flange, shafting or drives, wheel, motor or
motor base, or in any other manner that may bend or
distort parts.
If installation is to be delayed, store the unit in a
protected area. Protect the fan and motor bearings from
moisture and vibration (or shock loading). For extended
storage, wrap entire unit in plastic. Wrap loosely so air
may circulate around the fan and moisture does not
collect, or use a desiccant. Extended storage requires
monthly inspections. Check for corrosion or damage to
the unit and for debris within the fan. Rotate the fan
wheel a few revolutions. Stop the wheel in a position
other than the initial position. Grease the bearings every
month with a grease compatible with the grease sup­plied with the bearings.

Foundations and Supporting Structures

The TSL and QSL series can be mounted horizontally,
vertically, or at any angle if ordered accordingly. Mounting
brackets are available to accept both vibration isolating
hangers or pads. Typical mounting arrangements are
shown in Figures 2 through 8. Floor or wall mounted
fans may be installed on a flat, rigid foundation.
When mounting to concrete, anchor bolts should be
“L” or “T” shaped with sufficient length for nuts, wash­ers, shims, and threads for draw-down. Each bolt should
be placed in a sleeve or pipe with diameter larger than
the bolt to allow for adjustment. When the mounting
surface and the surface of the fan base do not match,
shim level. Do not distort the fan when tightening the
anchor bolts.
A fan mounted to or within a structure should be
placed as close as possible to a rigid member such as
a wall or a column. The structure must be designed for

rotating equipment. Static design for strength is not suf­ficient to insure operation at low vibration levels. Supports
for suspended fans must be cross-braced to prevent
side-sway. Structural resonance should be at least 20%
from fan operating speed. Vibration isolators may help
block the transmission of vibration into a structure.
Any ducting should have independent support; do not
use the fan to support ducting. Flexible connections are
required whenever the fan is supported on vibration iso­lators.

Figure 1.

Lifting With Lifting Lugs Lifting With Straps &
(Standard) Spreader Bar (Not Provided)

Fan Installation, Factory Assembled Units

Follow proper handling instructions as given earlier.

1. Move the fan to the final mounting position.

2. Remove skid, crates and packing materials carefully.

3. Attach vibration isolators (if used) to appropriate
mounting clips on fan. Locate fan in position using
lifting instructions above.

4. Carefully level unit using shims (on rigid mounted
fans) at mounting hole locations. Fans mounted with
vibration isolators may be leveled by adjusting the
hardware.

5. Continue with Operations Checklist.

Motor Maintenance

The three basic rules of motor maintenance are:

1. Keep the motor clean.

2. Keep the motor dry.

3. Keep the motor properly lubricated.

Blow dust off periodically (with low pressure air) to
prevent motor from overheating.
Some smaller motors are lubricated for life. Lubrication
requirements are normally attached to the motor. Use
the motor manufacturer’s recommendations for relubrica­tion. If this information is not available, the following
schedule may be used. Motors less than 10 HP running
about eight hours a day in a clean environment should
be lubricated once every five years; motors 15 to 40
HP, every three years. For motors in dusty or dirty
environments or running 24 hours a day: divide the
service interval by 4. Do not over lubricate.

Drive Maintenance and Installation

V-belt drives need periodic inspection, retensioning, and
occasional belt replacement. When inspecting drives,
look for dirt buildup, burrs or obstructions that can

©2014 Twin City Fan Companies, Ltd.

cause premature belt or drive replacement. If burrs are
found, use fine emery cloth or a stone to remove them.
Be careful that dust does not enter the bearings.
Check sheaves for wear. Excessive slippage of belts
on sheaves can cause wear and vibration. Replace worn
sheaves with new ones. Carefully align sheaves to avoid
premature sheave failure.
Inspect the belts for wear. If fraying or other wear is
observed to be mostly on one side of the belts, the
drives may be misaligned. Reinstall the drives according
to the following instructions:

1. Slip (do not pound) proper sheave onto corresponding
shaft. CAUTION: Placing fan sheave on motor can over-

speed wheel and cause structural failure.

2. Align sheaves with straightedge extended along
sheaves, just making contact in two places on out­side perimeters of both sheaves.

On the post type motor mount, the motor plate is
supported on four threaded rods. Belt tension is adjust­ed by loosening the four nuts on top of the motor plate
and raising the motor plate by adjusting the four nuts
underneath it. The top nuts should then be tightened to
hold the motor plate in place.
On the saddle type motor mount, the motor pivots
on one side and adjustment of belt tension is achieved
by loosening the nuts on top of the motor plate on the
other side, then raising the motor plate by adjusting the
nuts underneath the motor plate. The nuts on top of the
motor plate should again be tightened to hold the motor
plate in place. Several holes are provided on the pivot
side, and the pivot point can be raised for gross belt
adjustment. If this adjustment is made, however, the
motor plate should be as parallel as possible to the fan
centerplane. Care should be taken to maintain drive
alignment and proper belt tension.

3. Tighten sheave bolts (or setscrews if appropriate).
Table 1 can be used to determine the amount of
torque required.

4. Install a matched set of belts. Adjust the motor posi­tion to obtain slack, install, and tighten belts. Using
a pry bar will damage belts.

5. Tighten belts to proper belt tension. Ideal tension is
just enough so that the belts do not slip under peak
load. When using drive tensioning data supplied by
V-belt drive manufacturers, new belts can be tensioned
to a value 50% greater than for normal operation. This
will reduce retensioning requirements after break-in.
Recheck sheave alignment after tensioning.

6. After initial installation of belts, recheck belt tension
again after a few days. (New belts require a break-in
period of operation.)

7. When replacing belts, replace the entire set. After initial
replacement and tensioning, recheck belt tension after
a few days. (New belts require a break-in period of
operation.) Never use belt dressing on any belts.

8. Fans that have motors and drives mounted at the
factory are trim balanced prior to shipment. This is
not possible on units that are shipped without motors
and drives. The addition of drive components in the
field can create unbalance forces. Twin City Fan &
Blower recommends final balancing of the unit after
the drive components are installed. Failure to do so
may void the warranty.

Motor Support Adjustment

Two different types of motor mounts, post and saddle,
are used on TSL Inline Centrifugal and QSL Mixed Flow

Bearing Maintenance

Proper lubrication of the fan drive bearings helps assure
maximum bearing life. All fans are equipped with decals
indicating relubrication intervals for normal operating
conditions. See Figures 2, 3 and 4 for typical lubrication
data. However, every installation is different and the
frequency of relubrication should be adjusted accord­ingly.
On high moisture applications, the lubrication fre­quency may need to be doubled or tripled to adequate­ly protect the bearings. Double the relubrication fre­quency on fans with vertical shafts.
Observation of the conditions of the grease expelled
from the bearings at the time of relubrication is the best
guide as to whether regreasing intervals and amount of
grease added should be altered.
Greases are made with different bases. There are
synthetic base greases, lithium base, sodium base, etc.
Avoid mixing greases with different bases. They could
be incompatible and result in rapid deterioration or
breakdown of the grease. The lubrication sticker identi­fies a list of acceptable lubricants. All bearings are filled
with a lithium-based grease before leaving the factory.
When the fans are started, the bearings may discharge
excess grease through the seals for a short period of
time. Do not replace the initial discharge because leakage
will cease when the excess grease has worked out.
Sometimes the bearings have a tendency to run hotter
during this period. There is no reason for alarm unless
it lasts over 48 hours or gets very hot (over 200°F). When
relubricating, use a sufficient amount of grease to purge

the seals. Rotate bearings by hand during relubrication.
fans. Which mount to use depends on the size of the fan
and motor.

Table 1. Tightening Torque (Ft.-Lbs.)

SIZE

#10 — — — — — 5

1

⁄4-20 5.5 8 12 7.9 7.5 9

5

⁄16-18 11 17 25 16 13 15

3

⁄8-16 22 30 45 29 24 30

7

⁄16-14 30 50 70 — — —

1

⁄2-13 55 75 110 70 — 60

9

⁄16-12 — — — — — 75

5

⁄8-11 100 150 220 — — 135

3

⁄4-10 170 270 380 — — —

7

⁄8-9 165 430 600 — — —

1-8 250 645 900 — — —

1

1

⁄4-7 500 1120 1500 — — —

Tolerance: +5%
For wheel setscrews use Grade 2 values. The above torque values are for nonlubricated fasteners.

GRADE 2 GRADE 5 GRADE 8

FASTENER TAPER BUSHINGS

BROWNING SPLIT QD

IN IRON IN ALUM. HUB

FOR DRIVE

2

Twin City Engineering Supplement 895

Figure 2. Safety & Lubrication Instructions for Fans
with Ball Bearings

WARNING

1. This equipment must not be operated without proper guarding of
all moving parts. While performing maintenance be sure remote
power switches are locked off. See installation manual for recom­mended safety practices.

2. Before starting: Check all setscrews for tightness and rotate wheel
by hand to make sure it has not moved in transit.

Relubrication Schedule (Months)*

Ball Bearing Pillow Blocks

Speed (RPM)

Shaft DIA

(13 – 45)
1
(50 – 60)
2
(65 – 75)
3
(80 – 100)

500 1000 1500 2000 2500 3000 3500 4000 4500

1

⁄2" thru 111⁄16"

15

⁄16" thru 27⁄16"

11

⁄16" thru 215⁄16"

7

⁄16" thru 315⁄16"

6 6 5 3 3 2 2 2 1

6 5 4 2 2 1 1 1 1

5 4 3 2 1 1 1

4 3 2 1 1

* Suggested lubrication interval under ideal continuous operating condi­tions. Relubricate while running, if safety permits, until some purging
occurs at seals. Adjust lubrication frequency depending on conditions
of purged grease. Use one-half of listed interval for vertical shaft appli­cations or for 24 hour operation. Hours of operation, temperature, and
surrounding conditions will affect the relubrication frequency required.

1. Lubricate with a high quality NLGI No. 2 lithium-base grease hav­ing rust inhibitors and antioxidant additives, and a minimum oil
viscosity of 500 SUS at 100°F (38°C). Some greases having these
properties are:

Shell - Gadus S2 V100 2 Exxon - Ronex MP

Mobil - Mobilith SHC100 Mobil - Mobilith SHC220

2. Lubricate bearings prior to extended shutdown or storage and
rotate shaft monthly to aid corrosion protection.

Figure 3. Safety & Lubrication Instructions for Fans
with Unit Roller Bearings

WARNING

1. This equipment must not be operated without proper guarding of
all moving parts. While performing maintenance be sure remote
power switches are locked off. See installation manual for recom­mended safety practices.

2. Before starting: Check all setscrews for tightness and rotate wheel
by hand to make sure it has not moved in transit.

Relubrication Schedule (Months)*

Spherical Roller Bearing - Solid Pillow Blocks

Speed (RPM)

Shaft DIA

1" thru 1
(25 – 35)
1
(40 – 55)
2
(60 – 85)
3

(90 – 125)

* Suggested lubrication interval under ideal continuous operating condi­tions. Relubricate while running, if safety permits, until some purging
occurs at seals. Adjust lubrication frequency depending on conditions
of purged grease. Use one-half of listed interval for vertical shaft appli­cations or for 24 hour operation. Hours of operation, temperature, and
surrounding conditions will affect the relubrication frequency required.

1. Lubricate with a high quality NLGI No. 2 lithium-base grease hav-

Shell - Gadus S2 V100 2 Exxon - Ronex MP

2. Lubricate bearings prior to extended shutdown or storage and

500 1000 1500 2000 2500 3000 3500 4000 4500

7

⁄16"

11

⁄16" thru 23⁄16"

7

⁄16" thru 37⁄16"

15

⁄16" thru 415⁄16"

6 4 4 2 1 1 1 1

4 2 1

3 1

1

2

⁄2 1 1⁄2 1⁄4

1

⁄2 1 1⁄2 1⁄2 1⁄2 1⁄2 1⁄2

1

⁄2 1 1⁄2 1⁄2 1⁄4 1⁄4

1

ing rust inhibitors and antioxidant additives, and a minimum oil
viscosity of 500 SUS at 100°F (38°C). Some greases having these
properties are:

Mobil - Mobilith SHC100 Mobil - Mobilith SHC220

rotate shaft monthly to aid corrosion protection.

Figure 4. Safety & Lubrication Instructions for Fans
with Spherical Roller Bearings with Split Pillow
Block Housings

WARNING

1. This equipment must not be operated without proper guarding of
all moving parts. While performing maintenance be sure remote
power switches are locked off. See installation manual for recom­mended safety practices.

2. Before starting: Check all setscrews for tightness, and rotate wheel
by hand to make sure it has not moved in transit.

Relubrication Schedule (Months)*

Spherical Roller Bearing - Split Pillow Blocks

Speed (RPM)

Shaft DIA

7

⁄16" thru 115⁄16"

1
(35 – 50)

3

2

⁄16" thru 213⁄16"

(55 – 70)

15

2

⁄16" thru 315⁄16"

(75 – 100)

7

4

⁄16" thru 415⁄16"

(110 – 135)

7

5

⁄16" thru 615⁄16"

(140 – 180)

500 750 1000 1500 2000 2500 3000 3500 4000

1

6 4

⁄2 4 4 31⁄2 21⁄2 21⁄2 1 1

1

5 4

⁄2 4 21⁄2 21⁄2 11⁄2 1⁄2 1⁄4 1⁄4

1

4

⁄2 4 31⁄2 21⁄2 11⁄2 1 1⁄2

4 4 2

4 2

1

⁄2 1 1⁄2

1

⁄2 11⁄2

Grease

to be

added at

each

interval

0.50 oz.

0.75 oz.

2.00 oz.

4.00 oz.

7.00 oz.

*Suggested lubrication interval under ideal continuous operating condi­tions. Remove bearing cap and observe condition of used grease after
lubricating. Adjust lubrication frequency as needed. Use one-half of
listed interval for vertical shaft applications or for 24 hour operation.
Hours of operation, temperature, and surrounding conditions will affect
the relubrication frequency required. Clean and repack bearings annu­ally. Remove old grease, pack bearing full and fill housing reservoir
o n b o t h s i d e s o f b e a r i n g s t o b o t t o m o f s h a f t .

1. Lubricate with a high quality NLGI No. 2 lithium-base grease hav­ing rust inhibitors and antioxidant additives, and a minimum oil
viscosity of 500 SUS at 100°F (38°C). Some greases having these
properties are:

Shell - Gadus S2 V100 2 Exxon - Ronex MP

Mobil - Mobilith SHC100 Mobil - Mobilith SHC220

2. Lubricate bearings prior to extended shutdown or storage and
rotate shaft monthly to aid corrosion protection.

3. Purge or remove old grease when changing lubrication brands or
types.

Static Oil Lubrication

1. Use only high quality mineral oil with a VG grade indicated on the
customer submittal drawing.

2. Static oil level should be at the center of the lower-most roller
(Do not overfill.)

3. Complete lubrication change should be made annually.

Wheel and Shaft Maintenance

⁄2

Periodically inspect the shaft and wheel for dirt buildup,
corrosion, and signs of excess stress or fatigue. Clean
the components. If the wheel is removed for any reason,
make sure that it is securely attached to the shaft before
restarting the fan.

Structural Maintenance

All structural components or devices used to support or
attach the fan to a structure should be checked at
regular intervals. Vibration isolators, bolts, foundations,
etc., are all subject to failure from corrosion, erosion,
and other causes. Improper mounting can lead to poor
operation characteristics or fan fatigue and failure. Check
metallic components for corrosion, cracks, or other signs
of stress. Concrete should be checked to insure the
structural integrity of the foundation.

Twin City Engineering Supplement 895

3