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Introduction

This bulletin has been prepared to guide the users of heavy

duty centrifugal fans in the proper installation, operation and

maintenance procedures to insure maximum equipment life

with trouble-free operation.

Many fans of this type have custom features or compo-

nents. When manufacturers of components provide detailed

installation and operation manuals, they will be provided.

Because of the wide variety of equipment covered in this

bulletin, the instructions given here are general in nature.

Additional product and engineering information is available

at www.tcf.com.

For safe installation, startup and operational life of this

equipment, it is important that all involved with the equipment

be well versed in proper fan safety practices and read this

bulletin. Please review the safety section before beginning

any work. It is the user’s responsibility to make sure that

all requirements of good safety practices and any applicable

safety codes are strictly adhered to.

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 imme-

diately 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.) 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

or impeller, motor or motor base, or in any other manner that

may bend or distort parts. Never lift with slings or timbers

passed through the fan inlets.

Partial or disassembled units require special handling. All

parts should be handled in a fashion which protects the coat-

ings and parts from damage. Components should be handled

such that forces are not concentrated to avoid bending or

distortion.

The housing should be lifted using straps and spreaders.

Do not distort housing or side plates when lifting.

Bearing pedestals should be lifted using straps or padded

chains. Under no circumstance should an attached or sepa-

rated bearing pedestal be lifted by the shaft, bearings, drives,

motor or wheel.

The shaft and wheel assembly may be lifted using a hoist

and a spreader with a sling around the shaft at points nearest

the wheel. Use the spreader bar to ensure that the slings do

not push against the sides of the wheel as this may distort

the wheel. Take care not to scratch the shaft where the

wheel or bearings will be mounted. Never lift or support the

assembly by the wheel. Always support the assembly by the

shaft when lifting or storing. Do not support the shaft or the

wheel on the housing sides.

Wheels shipped separately can be lifted by slings running

between the blades or around the hub. Never lift the wheel

by blades or flanges. Always transport wheels by lifting. Do

not roll the wheel as this can damage coatings and change

the balance of the wheel.

Bent shafting is a source of vibration and bearing failure,

so handle the shaft with care. Any scratches on the shaft may

be removed with fine emery cloth or a stone.

Unit Storage

If fan installation is to be delayed, store the unit in an envi-

ronmentally stable and protected area. During storage, the fan

should not be subjected to vibration from external sources or

bearing damage may occur. The unit should be reasonably

protected from any accidental impacts. Cover the fan to pro-

tect coatings and to prevent any foreign material or moisture

from entering the inlet or discharge. Take care to protect the

motor, drives and bearings.

Extended storage requires monthly inspections. Check for

corrosion or damage to the unit and for debris within the fan.

Bearings tend to take on moisture if the atmosphere in

which they are stored is not at a constant temperature. To

avoid corrosion, it is necessary to keep the bearings full of

grease and to rotate them periodically. Even when full of

grease, bearings will take on moisture, so it is necessary

to purge the bearings with new grease to expel moisture

every thirty days. It is recommended that the bearings be

purged with grease while being rotated by hand. Do not use

high pressure greasers as they may ruin the bearing seals.

Spherical roller bearings with split pillow block housings must

be opened up and grease removed before start-up.

The drives and belts should be removed if the fan is

to be stored for a prolonged period. The drives should be

labeled for service and stored in a dry place. Belts should be

removed, coiled without kinks, placed in a heavy carton, and

stored in a dry, well-ventilated place. To prevent belt deterio-

ration storage conditions should not exceed 85°F and 70%

humidity. If belts show signs of deterioration, they should be

replaced prior to startup.

Motors should be stored in a clean, dry, vibration-free loca-

tion. The packaging should be opened up enough to allow air

circulation around the motor. The winding temperature should

be kept slightly above that of the surroundings to prevent

condensation. This can be accomplished by energizing the

internal heaters, if the motor is so equipped, or by using

space heaters. If it is impossible to heat the windings, the

motor should be wrapped tightly with a waterproof material

which also encloses several bags of desiccant. Replace the

desiccant regularly to prevent moisture problems. The motor

rotor should also be rotated regularly (monthly) to assure the

bearing parts are well greased.

Foundations and Supporting Structures

The best means of floor mounting a fan is on a well-designed,

flat, level concrete foundation. The foundation should have a

mass of at least three times that of the supported assembly.

Rigid foundation stiffness must be between 1x10

lbs./in. to

4x10

lbs./in. depending upon size and speed. The founda-

tion should extend 6" beyond the outer dimensions of the

fan and driver; however, it should be no more than twice the

area required for the equipment. If it is made larger, the mass

should be increased accordingly to resist rocking modes of

vibration. J or T type anchor bolts of sufficient size should

be used and should be tied into the reinforcing bar for the

foundation. After the concrete is poured, a pipe sleeve with

a diameter of 2 to 2

⁄2 times the anchor bolt diameter should

be provided around the anchor bolt for final adjustment (see

Figure 4). The mounting surface of the foundation should be

smooth for good shim contact. When deciding the thickness

ES-995

September 2012

Heavy Duty Centrifugal Fans

INSTALLATION, OPERATION & MAINTENANCE MANUAL

Summary of content (8 pages)

PAGE 1
Heavy Duty Centrifugal Fans ES-995 INSTALLATION, OPERATION & MAINTENANCE MANUAL September 2012 Introduction This bulletin has been prepared to guide the users of heavy duty centrifugal fans in the proper installation, operation and maintenance procedures to insure maximum equipment life with trouble-free operation. Many fans of this type have custom features or components. When manufacturers of components provide detailed installation and operation manuals, they will be provided.
PAGE 2
of the foundation, approximately 1 to 11⁄2" height should be allowed for shimming, grouting, leveling, washers, nuts, etc. Fans mounted on a sub-floor or mezzanine must have adequate stiffness or be mounted on an inertia base with springs properly selected. If a structural steel base or platform is to be used, the structure must be designed for the weight of the fan, live loads imposed by rotation of the rotor and driver, and any external live loads.
PAGE 3
Figure 1. Exploded View of Arrangement 4, SWSI Fan Components Figure 2. Wheel Placement (Wheel Overlap) HIB, RTF, HRT, HAF, BC, BCS, BAF, BAE Size 180 200 220 240 270 300 330 360 A DIA Inlet Funnel Housing Wheel/ Impeller Support Stand (Housing Frame) Motor Pedestal drive bearing and sheaves. Mount bearing bar assembly to housing. See Figure 2 for wheel-funnel overlap. a. Assemble parts in above order on shaft. b. Proceed with connection of the shaft assembly to supports in step 7 above. 10.
PAGE 4
2. 3. 4. 5. 6. 7. 8. are generally not interchangeable with parts from another bearing. The lower bearing housing should be bolted loosely to the pedestal and seals; bearing and adapter sleeve housing should be placed loosely on the shaft. The rotor assembly with the seals and bearings should next be positioned over the housings and carefully placed into the lower housings.
PAGE 5
reinstall belts. Tighten sheave bolts (or setscrews if appropriate). When replacing belts, replace the entire set. Never use belt dressing on any belts. 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.
PAGE 6
resultant splashing. e. The zerk on top of the bearing will be removed for that hole to be used as the oil inlet. 8. Anti-Rotation Clutch — Damage will occur if the fan is operated in the wrong rotation. Run the motor uncoupled from the fan to establish the proper rotation. 9. Stuffing Box/Shaft Seal — Check for concentricity around the shaft. Care should be taken in adjusting the outside hex nuts when breaking in the seal. Monitor the temperature during the break-in process.
PAGE 7
□ Check rotation for agreement with rotation arrow. □ Listen for any unusual noise. Run unit up to speed: □ Bearing temperatures are acceptable (<200°F) after one to two hours of operation. □ Check for excess levels of vibration. Refer to Table 1 for vibration limits. After one week of operation: □ Check all nuts, bolts and setscrews and tighten if necessary. □ Readjust drive tension if necessary. Troubleshooting Guidelines Use current safety practices when investigating fan or system performance problems.
PAGE 8
Figure 5. Safety & Lubrication Instructions for Fans with Ball Bearings Figure 7. 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.