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5. LOCATING AND INSTALLING THE SUPPLY
DAMPER(S) (See Figure 5)
!
CAUTION:
When a home is not equipped with a make-ready
kit by the manufacturer, means must be provided
to prevent simultaneous operation of the heating
and cooling units. A heat/cool thermostat is
available for this purpose.
When installing this air conditioning system in
conjunction with a furnace, a damper must be
installed in the furnace base assembly to prevent
cold air being discharged around the heat
exchanger. Damage to the heat exchanger and
asphyxiation may occur if a damper is not
installed.
Check with the furnace manufacturer for damper
requirements. Failure to install the required
furnace damper may invalidate code agency
listing and limited warranty on the furnace.
Figure 5. Supply Damper
When locating the supply damper(s), carefully check floor
joists, axles, wheels, and frame members that could interfere
with the installation of the damper or flexible duct. Ideally, the
damper should be located in the bottom of the main duct,
forward of center of the home, at least three feet from the
nearest register. The round supply opening in the slanted side
of the damper should face the side of the home where the air
conditioner is located. To locate the center of the heat duct,
first cut a small hole in the fiberboard below the duct at the
desired location. After locating the duct center, cut a hole
approximately 3/4" larger than the damper opening in the
fiberboard. Cut a 9-1/8" x 13-1/8" hole in the duct and bend
over all tabs flat on the inside of the heat duct. After inserting
the damper into the duct, bend over all tabs flat on the inside
of the heat duct. Seal the opening between the fiberboard and
damper or flexible duct.
6
DUCTING SYSTEM
DUCT REQUIREMENTS
The supply duct system, including the number and type of
registers, will have much more effect on the performance of
an air conditioning system than any other factor. The duct
must be sufficiently large to conduct an adequate amount of
air to each register.
THE AIR CONDITIONING OUTPUT OF THE SYSTEM WILL
NOT COOL THE HOME IF THE AIR IS LOST TO THE
OUTSIDE THROUGH LEAKS IN THE DUCT SYSTEM.
ALSO, DUCTS WHICH ARE COLLAPSED OR RESTRICTED
BY FOREIGN OBJECTS WILL PREVENT ADEQUATE AIR
FLOW.
Note: For highly resistive duct systems it may be necessary
to add an additional return air duct and or supply to
achieve maximum performance and prevent coil icing
and refrigerant flood back.
CONNECTING THE RETURN AND SUPPLY AIR
FLEXIBLE DUCTS
a. The supply duct for all units is twelve inches in diameter.
The return duct may be 12" or 14" diameter depending on
unit size. (See Table on page 5)
b. The flexible ducts can be connected to the corresponding
fittings with the clamps provided with the ducts. Note: All
connections should be leak tight or a loss in cooling
capacity will result.
c. The flexible ducts may be cut to the required length, see
instructions packed with duct. Keep all ducts as short
and straight as possible. Avoid sharp bends.
d. Ducts may be spliced with sheet metal sleeves and
clamps. (See Ducting Installation Accessories below.)
e. Once the inner duct is connected to the proper fitting, the
insulation and plastic sleeve should be pulled over the
connection and clamped.
f.
For double-wide homes or for special applications, a Y
fitting is available to divide the supply air so it can be
ducted to different areas of the home for more efficient
cooling. Note: The Y fitting should be insulated for
maximum performance.
!
WARNING:
Running a furnace with a damaged heat
exchanger could cause a fire or asphyxiation.
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