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WARNING
In all cases, there must be a metal duct
connection made to the supply air flange, and a
one inch clearance to combustibles must be
maintained to this duct connection.
For free blow applications, a metal sleeve
must be used in the wall opening itself, again
maintaining a one inch clearance to
combustibles.
Failure to use the sheet metal can cause fire
resulting in property damage, injury, or death.
See Figure 5 and clearance information in Section 9
and Table 2 for additional information.
Design the duct work according to methods given by
the Air Conditioning Contractors of America
(ACCA). When duct runs through unheated spaces,
it should be insulated with a minimum of one inch of
insulation. Use insulation with a vapor barrier on the
outside of the insulation. Flexible joints should be
used to connect the duct work to the equipment in
order to keep the noise transmission to a minimum.
A one inch clearance to combustible material for the
first three feet of duct attached to the outlet air frame
is required. See Wall Mounting Instructions and
Figures 4 and 5 for further details.
Ducts through the walls must be insulated and all
joints taped or sealed to prevent air or moisture
entering the wall cavity.
Some installations may not require any return air
duct. A metallic return air grille is required with
installations not requiring a return air duct. The
spacing between louvers on the grille shall not be
larger than 5/8 inch.
Any grille that meets with the 5/8 inch louver criteria
may be used. It is recommended that Bard Return
Air Grille RG5 or Return Filter Grille RFG5 be
installed when no return duct is used. Contact
distributor or factory for ordering information. If
using a return air filter grille, filters must be of
sufficient size to allow a maximum velocity of 400
fpm.
NOTE: If no return air duct is used, applicable
installation codes may limit this cabinet to
installation only in a single story structure.
Manual 2100-365
Page 6
4. HIGH ALTITUDE APPLICATIONS
Ratings of gas utilization equipment are based on sea
level operation and need not be changed for
operation at elevations up to 2,000 feet. For
operation at elevations above 2,000 feet and in the
absence of specific recommendations from the local
authority having jurisdiction, equipment ratings shall
be reduced as specified in Section 18.
5. TRANSPORTATION DAMAGE
All units are packed securely in shipping container.
All units should be carefully inspected upon arrival
for damage. In the event of damage, the consignee
should:
1. Note on delivery receipt of any damage to
container.
2. Notify carrier promptly, and request an inspection.
3. In case of concealed damage, the carrier must be
notified as soon as possible within 15 days after
delivery.
4. Claims for any damage, apparent or concealed,
should be filed with the carrier, using the
following supporting documents:
A. Original Bill of Lading, certified copy, or
indemnity bond.
B. Original paid freight bill of indemnity in lieu
thereof.
C. Original invoice or certified copy thereof
showing trade and other discounts or
deductions.
D. Copy of the inspection report issued by
carrier's representative at the time damage is
reported to carrier.
6. INSTALLATION
Size of unit for proposed installation should be based
on heat loss/heat gain calculations made according to
methods of Air Conditioning Contractors of America
(ACCA). The air duct should be installed in
accordance with the Standards of the National Fire
Protection Association for the Installation of Air
Conditioning and Ventilating Systems of Other Than
Residence Type, NFPA No. 90A, and Residence
Type Warm Air Heating and Air Conditioning
Systems, NFPA No. 90B. Where local regulations
are at a variance with instructions, installer should
adhere to local codes.
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