Twin City IM-4870 User Manual

Upblast Propeller Roof Fans

INSTALLATION, OPERATION & MAINTENANCE MANUAL

IM-4870

August 2014

Models: LUD, LUB, LUBMO, LUBSH

Twin City Fan & Blower Catalog 4870 provides additional information on this equipment. This catalog can be found
at www.tcf.com or by contacting your local Twin City Fan & Blower sales representative.

LUB

LUBMO

©2014 Twin City Fan Companies, Ltd.

Receiving, Unpacking & Inspection

When the equipment is received all items should be
carefully checked against the bill of lading to be sure all
crates and cartons have been received. Before accepting
delivery, carefully inspect each carton or crate for
visible shipping damage. If any damage is noticed, the
carrier should make the proper notation on the delivery
receipt acknowledging the damage. Make notations of
all damage on all copies of the bill of lading and have
all copies countersigned by the delivering carrier. The
carrier should also fill out a Carrier Inspection Report.
The factory Traffic Department should then be contacted.
File claim for damage with the carrier. Physical damage
to the unit after acceptance is not the responsibility of
Twin City Fan Companies, Ltd.

Unpack each carton or crate and verify that all required
parts and proper quantities of each item have been
received. Refer to drawings for part descriptions. Report
shortages or missing items to your local representative
to arrange for replacement parts.

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 the
fan inlet and outlet and keep motors dry and clean.

For extended storage (more than 3 months) motor shafts
and bearings should be rotated monthly. If stored longer

Due to availability of carriers and truck space, it is not
possible to guarantee that all items will be shipped
together. Verification of shipments must be limited to
only those items on the bill of lading.

The unit nameplate must be checked to make sure the
voltage agrees with the power supply available.

CAUTION: Sheet metal parts, screws, clips and simiar
items inherently have sharp edges, and it is necessary
that the installer and service personnel excercise
caution.

The installation of this equipment shall be in accordance
with the regulations of authorities having jurisdiction and
all applicable codes. This equipment is to be installed
by an experienced installation company and fully trained
personnel. The mechanical installation of the exhaust
ventilator consists of making final connections between
the unit and building services, duct connections.

than 6 months, bearing grease in motor and fan should
be purged and replaced with compatible grease. Belts
should be rechecked 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.

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

following 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 for said

products;

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.)

2 Twin City IM-4870

Installation

Models LUD, LUB, LUBMO and LUBSH are all designed
to be lifted onto the building by using the windband
brackets which double as lifting points for these
models. Units can be lifted onto the building with or
without the windband mounted onto the unit. Straps or

Windband
Brackets

Once the fan has been carefully lifted onto the roof
curb, it should be secured by installing fasteners into all
of the holes provided in the base of the fan.

chain capable of handling the load of the unit should
be securely attached to each of the four windband
brackets. The unit should not be lifted by any other parts

such as drive frame, motor, damper blades, windband,
orifice panel, curb cap, etc.

WARNING: Units with the fusible link assembly are
under extremely high spring tension. Care must be
taken to not accidentally set off the damper lifters when
servicing the fan. The fusible link damper lifters are
located under the butterfly damper blades. Failure to
exercise caution could cause severe injury or death.

Accessibility

Models LUBMO and LUBSH provide for easy access
to the drive parts from the roof. The motor cover is
easily removable to provide access to the motor, belt
and motor sheave while the standard access panel,
located opposite of the motor, provides access to the
fan sheave and bearings. Service of the propeller can
be achieved by removing the stack cap and orifice panel
assemblies from the base.

Removable
Motor Cover

Motor and drive assemblies on models LUB and LUD
can be accessed from the roof by removing the stack
cap and orifice panel assemblies from the roof curb.
A hinged base is available as an accessory on sizes
36 and below to allow for easier access from the roof.

Note: Twin City Fan recommends the use of an inlet
safety guard on all non-ducted installations.

Removable
Access Panel

Twin City IM-4870 3