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FIGURE 9
PACKAGED HEAT PUMP
FLAT ROOFTOP INSTALLATION, ATTIC OR DROP CEILING
DISTRIBUTION SYSTEM. MOUNTED ON
ROOFCURB. CURB MUST BE LEVEL.
VII. DUCTWORK
Ductwork should be fabricated by the installing contractor in
accordance with local codes and NFPA90A. Industry manuals
may be used as a guide when sizing and designing the duct
system - contact Air Conditioning Contractors of America, 1513
16th St. N.W., Washington, D.C. 20036.
WARNING
!
DO NOT, UNDER ANY CIRCUMSTANCES, CONNECT
RETURN DUCTWORK TO ANY OTHER HEAT PRODUC-
ING DEVICE SUCH AS A FIREPLACE INSERT, STOVE,
ETC. UNAUTHORIZED USE OF SUCH DEVICES MAY
RESULT IN FIRE, CARBON MONOXIDE POISONING,
EXPLOSION, PROPERTY DAMAGE, SEVERE PERSONAL
INJURY OR DEATH.
The unit should be placed as close to the space to be air
conditioned as possible allowing clearance dimensions as
indicated. Ducts should be run as directly as possible to supply
and return outlets. Use of non-flammable waterproof flexible
connectors on both supply and return connections at the unit to
reduce noise transmission is recommended.
It is preferable to install the unit on the roof of the structure if
the registers or diffusers are located on the wall or in the ceil-
ing. A slab installation could be considered when the registers
are low on a wall or in the floor.
On ductwork exposed to outside air conditions of temperature
and humidity, use a minimum of 2" [50.8 mm] of insulation
and a vapor barrier. Distribution system in attic, furred space
or crawl space should be insulated with at least 2" [50.8 mm]
of insulation with vapor barrier. One-half to 1" [25.4 mm] thick-
ness of insulation is usually sufficient for ductwork inside the
air conditioned space.
40
ST-A1273-29-00
Balancing dampers should be provided for each branch duct
in the supply system. Ductwork should be properly supported
from the structure.
When installing ductwork, consider the following items:
1. Noncombustible flexible connectors should be used
between ductwork and unit to reduce noise and vibration
transmission into the ductwork.
2. When auxiliary heaters are installed, use noncombustible
flexible connectors and clearance to combustible mate-
rial of 0" for the first 3 feet [0.91 m] of discharge duct.
Clearance to unit top and side is 0".
VIII. FILTERS
This unit is provided with 4 – 2" × 20" × 20" [51 mm × 508 mm
× 508 mm] disposable filters. When replacing filters, ensure
they are inserted fully to the back to prevent bypass.
IX. CONVERSION PROCEDURE
DOWNFLOW TO HORIZONTAL
1. Remove the screws and covers from the outside of the
supply and return sections.
2. Install the covers over the bottom supply and return open-
ings, painted side up inserting the leading flange under the
bracket provided. Place the back flange to the top of the
front bracket provided. See Figure 10.
3. Secure the return and supply cover to the front bracket with
screws.
FIGURE 10
COVER GASKET DETAIL
X.
CONDENSATE DRAIN
IMPORTANT: Install a condensate trap to ensure proper
condensate drainage. See Figure 11.
Standard Drain
• The condensate drain pan has a threaded female 3/4" NPT
(11.5 TPI) connection.
• To use the removable drain pan feature of this unit, some
of the condensate line joints should be assembled for easy
removal and cleaning.
• Use a thin layer of Teflon tape or paste on drain pan con-
nections and install only hand tight.
• Drain line MUST NOT block service access panels.
• Drain line must be no smaller than the drain pan outlet and
adequately sized to accommodate the condensate dis-
charge from the unit.
• The center of the drain outlet of the drain line must be a
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