Twin City Heavy Duty Centrifugal Fans - ES-995 - Manual (Page 6)

6 Twin City Engineering Supplement ES-995
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 tempera-
ture during the break-in process.
If equipped with a purge, pressure should be adjusted
enough for leakage to be into the fan.
10. Site-feed oilers — Fans provided with optional, site-feed
oilers, the oil level is to be set as indicated by the manu-
facturer’s installation instructions provided with the fan.
11. Concrete filled bases:
Inertia Bases – Inertia bases are spring isolated bases
specifically designed to be filled with concrete (by others).
The following instructions are a guide for filling a base
with concrete. Remember to use safe practices when fill-
ing concrete into the base. It is best to fill concrete at or
near the base’s final resting area to reduce injury while
transferring to the permanent location.
An inertia base is supplied with steel mesh or rebar
added within the base frame with the intent of being filled
with concrete and then mounted on springs. Bases may
be supplied with or without an optional bottom pan (sealer
sheet).
When an optional bottom pan is supplied from the fac-
tory, the base must be set on a flat, level surface with
the bottom pan directly on the surface fully supporting the
pan to maintain flatness on the bottom side. Pour concrete
into the base and remove excess concrete on the top
side of the base to maintain an even mounting surface for
fan mounting. Lift the base after the concrete has cured.
Install isolators per the isolator installation manual.
When the optional bottom pan is not supplied, the base
must be set on a flat, level surface that can fully support
the weight of the concrete. Place a sheet of heavy-mil
poly-film between the flat surface and the base frame.
Pour concrete into the base and remove excess concrete
on the top side of the base to maintain an even mounting
surface for fan mounting. Lift the base after the concrete
has cured. Install isolators per the isolator installation
manual. NOTE: Concrete cure time varies depending on
the base size, ambient temperature and cement mixture
requested. Be sure concrete is 100% cured prior to mov-
ing equipment.
WARNING: Consult the Twin City Fan Companies, Ltd.
Engineering Department for proper lifting instructions.
Unitary Bases – Unitary bases are rigidly mounted to a foun-
dation. Situations may arise where the base my require
concrete to dampen vibration or increased stiffness. In
situations where concrete must be added to the base the
following guide must be utilized.
1. Rebar must be added to the cross section of the base
(by others) so the concrete will have good adhesion
points throughout the sections of the base. Typically
rebar is installed at 12” centers however the placement of
rebar should be reviewed for each individual application
by a Civil Engineer if required.
2. Bases should be located in their final resting area prior
to being filled with concrete. Bases should be shimmed
and grouted. Once the grout is cured, concrete may
be added. Pour concrete (by others) into the base and
remove excess concrete on the top side of the base to
maintain an even mounting surface for fan mounting.
12. Concrete filled pedestals — Fans may require the bearing
and/or motor pedestals to be filled with concrete (by oth-
ers) for additional stiffness and rigidity. Fans must utilize
rebar in the pedestals so the concrete will have good
adhesion points throughout.
To fill the pedestal, the pedestal must be set on flat,
level ground before concrete is added. It is recommended
to locate the fan at the final location. The fan should be
leveled, shimmed, and grouted prior to adding concrete.
An optional bottom pan is available for the pedestal if it
is unfeasible to add concrete at the final location. Pedestals
must be placed on the ground for filling until the concrete
cures. If no bottom pan is provided, a piece of plywood
covered in plastic may be placed under the base while fill-
ing with concrete. Fill the pedestal with concrete (by others)
to the level indicated on the drawings. After the concrete
cures the fan may be installed. Do not utilize the fan’s lifting
lugs after concrete has been added to the fan. The lifting
lugs are designed to lift the fan as it was shipped from
the factory. NOTE: Concrete cure time varies depending on
the pedestal size, ambient temperature and cement mixture
requested. Be sure concrete is 100% cured prior to moving
equipment.
WARNING: Consult the Twin City Fan Companies, Ltd.
Engineering Department for proper lifting instructions.
Grouting
Grouting is the final installation step. Check all shims before
grouting to make sure that the fan is resting evenly on all
points with anchor bolts secured to hold the shim. Use forms
with sufficient space allowed for working the grout. The con-
crete foundation should be clean and well moistened before
pouring grout. Use a commercial grade nonshrinking grout and
be especially sure when pouring grout that the anchor bolt
sleeves are filled. Refer to Figure 4 for a detail of a proper
foundation, grout allowance and anchor bolt sleeves.
Fan Operation—Safety
For general safety practices for air moving equipment, see
AMCA Bulletin 410. Twin City Fan & Blower offers many
safety accessories. These safety devices include (but are
not limited to) belt guards, shaft guards, inlet and discharge
screens. The use and suitability of safety devices is the
responsibility of the purchaser.
Facility related safety conditions include fans’ accessibility
and location. How easily can nonservice personnel access
the unit? Is the fan in a hazardous duty environment? Was
the unit ordered for this duty? Other concerns must also
be addressed. All fans should be powered through switches
which are easily accessible to service personnel from the
fan. Every switch should have the ability to be “locked out”
by the service person and the key to be retained by this
person to prevent accidental powering of the fan while ser-
vice is in process.
Operation Checklist
□ Verify that proper safety precautions have been followed
□ Electrical power must be locked off.
Check fan mechanism components:
□ Nuts, bolts, setscrews are tight.
□ Rotating assembly turns freely prior to connecting any
ducting or inlet box
□ Mounting connections are properly made and tightened.
□ Bearings are properly lubricated.
□ Wheel, drives and fan surfaces are clean and tightened.
□ Rotating assembly turns freely and does not rub.
□ Drives on correct shafts, properly aligned, and properly
tensioned.
Check fan electrical components:
□ Motor is wired for proper supply voltage.
□ Motor was properly sized for power of rotating assembly.
□ Motor is properly grounded.
□ All leads are properly insulated.
Trial “bump”:
□ Turn on power just long enough to start assembly rotating.