5
Air Duct System
Air ducts should be installed in accordance with the standards of
the National Fire Protection Association “Standard for Installation
of Air Conditioning and Ventilation Systems” (NFPA 90A),
“Standard for Installation of Residence Type Warm Air Heating
and Air Conditioning Systems” (NFPA 90B), these instructions,
and all applicable codes. NFPA publications are available by
writing to: National Fire Protection Association, Batterymarch
Park, Quincy, ME 02269 or visit www.NFPA.org on the web.
• Design the duct work according to methods described by the
Air Conditioning Contractors of America (ACCA).
• The supply duct system, including the number and type of
registers, will have much more effect on the performance of
the system than any other factor. The duct must be sufficiently
large to conduct an adequate amount of air to each register.
• Duct work should be attached directly to the unit flanges for
horizontal applications.
• 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.
• The heat pump system will not cool or heat the home if
air is lost to the outside through leaks in the duct system
or poor installation. Ducts that are collapsed or restricted
by foreign objects will also prevent adequate air flow.
• All duct work passing through unconditioned space must
be properly insulated to minimize duct losses and prevent
condensation. Use insulation with an outer vapor barrier.
Refer to local codes for insulation material requirements.
HEAT PUMP INSTALLATION
Unpacking the Unit
It is recommended that the unit be unpacked at the installation
site to minimize damage due to handling.
CAUTION:
Do not tip the unit on its side. Oil may enter the
compressor and cause damage.
1. Remove the bands from around the unit.
2. Unfold the top and bottom cap flanges.
3. Carefully remove the top cap and tube.
Installing Return & Supply Air Collars (Optional)
Supply and return collars are not supplied with the unit but
are offered as accessory item. Check with your distributor for
pricing and availability. They can be easily positioned over the
unit openings and secured with sheet metal screws. See
• The diameter of the return duct collar is 14”.
• The diameter of the supply duct collar is 12”.
• Before permanently installing the collars, it is recommended
you pre-fit them over the openings first to determine best fit
and alignment.
Supply Duct
1. Assemble the collar by overlapping the two ends.
NOTE:
One end of the collar is slotted and the opposite end
has two small holes. Position the end with small screw holes
underneath the slotted end.
2. Fasten the collar ends with two self drilling sheet metal screws.
3. Position the collar over the opening and align the 4 holes in
the collar with the 4 holes (or dimples depending on model)
in the rear panel.
4. Using self-drilling screws (10-16x.5), secure the collar to the
rear panel.
Figure 2. Typical Duct Applications
SINGLE DUCT APPLICATION
MULTIPLE DUCT APPLICATION
