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 sys-
tem - contact Air Conditioning Contractors of America, 2800 Shirlington Road, Suite 300,
Arlington, VA 22206, http:/www.acca.org.
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 ceiling. 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" of insulation and a vapor barrier. Distribution system in attic, furred space or crawl space
should be insulated with at least 2" of insulation with vapor barrier. One-half to 1" thickness of
insulation is usually sufficient for ductwork inside the air conditioned space.
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 clear-
ance to combustible material of 0" for the first 3 feet of discharge duct. Clearance to unit
top and side is 0".
VIII. FILTERS
This unit is provided with 8 - 20" x 25" x 2" disposable filters. When replacing filters, ensure
they are inserted fully to the back to prevent bypass. See Figure 8.
Recommended supplier of this filter is Glassfloss Industries, Inc. or
AAF International
215 Central Avenue
P.O. Box 35690
Louisville, KY 40232
Phone: 1-800-501-3146
Part #: 54-42541-04 (20” x 25” x 2”)
FIGURE 13
PACKAGED HEAT PUMP
FLAT ROOFTOP INSTALLATION, ATTIC OR DROP CEILING
DISTRIBUTION SYSTEM. MOUNTED ON
ROOFCURB. CURB MUST BE LEVEL
FIGURE 14
COVER GASKET DETAIL
ST-A1125-01B
14
Summary of Contents for RJNL-B SERIES
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