Twin City Gravity Relief / Intake Ventilators - IM-4700 - Manual (Page 4)

Backdraft Damper Installation (Optional - GRV, TEL, TIL)
1. Damper must be mounted prior to unit installation.
3. Damper should be installed inside curb on a nailing
strip or tray (see Figure 3).
4. Be sure knockout for power supply, in one corner of
the damper frame, is in the most convenient position
for connecting between power source and conduit
raceway of unit.
5. Before setting unit on curb, ascertain that the damper
is positioned horizontally and operative.
6. Damper motors (optional) are available for 115, or
208-230, 460V, or 575V. When power supply is three-
phase, the damper can be connected across any two
of the three phases. A power supply of 575V requires
a step-down transformer to 115V. Damper motor is
energized continuously when open.
NOTE: Outside dimensions of damper are 1 ⁄
8
" less than
specified.
CAUTION: Installation of the damper will differ when
using the unit as a relief ventilator versus an intake. The
damper must be motorized when used with a GRV as
an intake ventilator.
1. Periodically inspect bird or insect screens to ensure
they are clean and not restricting airflow.
2. If using a backdraft damper on a GRV, TEL or TIL
Ventilator, ensure that it can operate freely.
3. Make sure the butterfly dampers on an LUG operate
freely.
4. Periodically inspect filters on a TIL, if so equipped,
to ensure they are clean.
Seller warrants to the original purchaser that the goods
sold hereunder shall be free from defects in workman-
ship 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 fol-
lowing 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; and
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 manufac-
turers. 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, inciden-
tal 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.)
Limitation of Warranties and Claims
Maintenance
TWIN CITY FAN & BLOWER | WWW.TCF.COM
5959 Trenton Lane N | Minneapolis, MN 55442 | Phone: 763-551-7600 | Fax: 763-551-7601
Figure 3. Backdraft Damper Installation
MOUNTING SCREW
(FIELD SUPPLIED)
KNOCKOUT FOR
POWER SUPPLY
ROOF CURB
BACKDRAFT DAMPER
(OPTIONAL)
DAMPER TRAY