Twin City IM-390 User Manual
Centrifugal Fume Exhaust Fans
INSTALLATION, OPERATION & MAINTENANCE MANUAL
IM-390
August 2014
INTRODUCTION
This manual has been prepared to guide the users of BAIFE and BCIFE Fume Exhaust Fans in the proper installation,
operation and maintenance procedures to insure maximum equipment life with trouble-free operation.
CONTENTS
Inspection and Receiving ...........................................................................................................................................................2
Handling and Rigging .................................................................................................................................................................2
Storage .........................................................................................................................................................................................2
Installation
• Pre-Installation Checklist .................................................................................................................................................... 2
• Foundations and Supporting Structures ...........................................................................................................................3
• Roof Curb Installation .........................................................................................................................................................3
• Mixing Box Assembly Installation ......................................................................................................................................3
• Fan and Windband Installation .......................................................................................................................................... 3
• Drain Connections ...............................................................................................................................................................4
• Damper and Actuator Installation ...................................................................................................................................... 4
Operation Checklist .....................................................................................................................................................................5
Maintenance
• Fan .......................................................................................................................................................................................5
• Motor ....................................................................................................................................................................................5
• Bearing .................................................................................................................................................................................5
• Drive ..................................................................................................................................................................................... 6
• Wheel and Shaft .................................................................................................................................................................6
• Structural .............................................................................................................................................................................6
• Fan Operation - Safety ......................................................................................................................................................6
Troubleshooting ...........................................................................................................................................................................6
Caution:
Fan systems include rotating components and electrical devices. Proper care must be taken during installation
and maintenance of all fan system components to protect personnel. This includes, but is not limited to the use
of protective enclosures, guards, locking devices to stop rotating parts, and electrical disconnect lock-outs. Refer
to applicable local codes to ensure compliance for all protective devices.
Fans create a suction at the inlet. Care should be taken around a the inlet of the fan, whether it is in operation
or not. Make sure the inlet area is clear prior to energizing the system. This includes all personnel and loose,
foreign objects.
©2012 Twin City Fan Companies, Ltd.
INSPECTION 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.
UNIT STORAGE
If fan installation is to be delayed, store the unit in an
environmentally 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 protect coatings and to prevent any foreign
material or moisture from entering the inlet or discharge.
Take care to protect the motor, drives and bearings.
HANDLING AND RIGGING
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 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.
Mixing plenum boxes configured for multiple fans mounted
on a common unit are modular in design and may be
broken down into smaller segments for ease of installation
and handling.
Figure 1. Lifting Locations
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.
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 deterioration 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
location. 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.
Start-Up – When the unit is removed from storage, all fan
bearing grease should be purged and replenished with
fresh grease as per the lubrication decal. The motor should
be measured to verify that the resistance is still at a satisfactory level compared to the value recorded prior to
storage.
INSTALLATION
Pre-Installation Checklist
Prior to fully assembling and installing, inspect the fan and
ancillary components to ensure it is in working order.
• Check all external and internal hardware on the fan,
wheel, bearings, drive motor base and accessories for
tightness.
• Rotate the fan wheel by hand and assure no parts are
rubbing. Adjust components prior to installation as adjustments are easier while lower to grad.
• Check proper wheel clearances to be sure near tolerance. The wheel will need to be realigned after installation, therefore, clearances should be near tolerance.
2
Twin City Fan IM-390
Foundations and Supporting Structures
The best means of floor mounting a fan is on a welldesigned, 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
size and speed. The foundation 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
diameter should be provided around the anchor bolt for
final adjustment. The mounting surface of the foundation
should be smooth for good shim contact. When deciding
the thickness of the foundation, approximately 1 to 1
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. The structure should be
designed to ensure that no natural frequency will occur
within 30% of the fan speed. This is especially true if
the structure supports more than one fan.
Any ducting should have independent support. Do not
use the fan to support ducting as the housing or pedestal may become distorted. The fan frame can be
designed to carry some external loads. Consult the factory if this is a concern. Isolating the fan from ductwork
with flex connections eliminates transmission of vibration.
Fans handling hot gases require expansion joints at both
the inlet and discharge to prevent excessive loads
caused by thermal growth.
Roof Curb Installation
Caution: Roof curbs should be square and level to ensure
safe fan installation and proper sealing of gas stream to
the fan.
Roof curbs shall be installed and fully attached to structural support (by others) which is typically steel or concrete
using 1/2" diameter bolts w/ 1-3/8" washers (by others).
Figure 2. Bolted Installation
For attachment to structural steel the curb can be continuously welded or stitch welded using 3/8" x 6" welds
with a maximum of 3" spacing between welds. Welds
should be evenly spaced along curb side and corners.
6
lbs./in. to 4x106 lbs./in. depending upon
1
⁄2 times the anchor bolt
1
⁄2"
Figure 3. Welded Installation
Mixing Plenum Box Assembly and Installation
The modular plenum mixing boxes are designed to allow
for easy installation and future expandability. Single mixing
plenum boxes are fully assembled (less any dampers) to
expedite installation. Depending on the size, multi-unit mixing boxes may or may not be assembled. When installing
the mixing box(es), it is important to follow the guidelines
for lifting and rigging on page 2.
When a single-unit mixing plenum box is installed, prepare
the roof curb or mounting structure. Lay gasket material
on the top edge of the roof curb. Lift mixing box onto
curb and square (level) mixing box.
Depending on the air intake (side or bottom), the mixing
box must be oriented to allow for direct duct connection
into the mixing plenum box. Match drill roof curb to mixing plenum box. Attach mixing plenum box to curb using
1/2” diameter bolts with 1 3/8” washers (by others).
For multi-unit configurations, some assembly may be
required. There are at least two different assemblies in a
multi-unit configuration. There is the mixing plenum box
assembly and the mixing box spacer. There will be one
less spacer than the quantity of mixing plenum boxes.
To assemble, space the mixing boxes a distance apart that
is slightly more than the width of the spacer section. Utilize
a gasket between the mixing box and the spacer section
to provide a tight seal.
Install 316 stainless steel bolts to attach the spacer and
the mixing box. Repeat as necessary for each section.
When the multi-unit mixing plenum box is assembled, rig
the mixing box system with spreader bar to avoid any
damage.
Install mixing plenum box assembly onto a prepared (gasket material on mating surface) roof curb or mounting
structure. Lay Square (level) mixing box. Install lag bolts
into the mixing plenum box to roof curb as indicated.
Fan and Windband Installation
• Follow proper handling instructions as provided earlier.
• Identify each fan and component and match the
equipment up with the supplied customer drawing(s).
• Move the fan to the final mounting location.
• Remove skid, crates and packing materials carefully.
• If vibration isolation is to be used, place isolation
base on mounting bolts. Line up holes in fan base
with bolts.
• Fans shipped as a single unit shall be broken down
into several parts. Install each item individually in the
following order:
1. Fan onto vibration or rigid base
Stack extension, if in the scope of supply
2. Windband
Note: When installing the components, lifting lugs shall be
utilized for safe installation. Lifting lugs are designed for the
weight of the component they are welded to and should not
be used to lift assemblies.
Twin City Fan IM-390
3
Loading...