Ducted Installations - GE 5500 Data Manual

Ducted Installations

2500 and 3500 Series Zoneline units may be
used in ducted installations.
With a ducted installation it is possible to condition the air
in two areas that have a common wall separating them. A
special adapter mounts on the wall case and a transition
piece directs the air from the unit into the adapter.
Instructions for mounting the adapter to the wall case are
included with the duct adapter. The adapter contains a grille
that allows air from the unit to be discharged into the
primary room and the adapter connects to a duct extension
that allows the air to flow to the adjoining room. Ducting a
unit may allow a single unit to be used rather than a
separate unit in each room, providing a means of reducing
initial equipment cost. The duct may extend a total of 15
feet (with a field fabricated insulated duct extension) in one
direction, either to the right or to the left of the unit. A
baffle in the adapter allows up to 50% of the discharge air to
be delivered to the secondary room.
The installation of the wall case and sub-base, if used, is the
same for units being ducted as for free-standing units. The
duct adapter support bracket overlaps the wall case by 1"
and the bracket and mounting screws add approximately
3/8" (3/16" on each side) to the width of the wall case. If
less than 1" of the wall case projects into the room it will be
necessary to allow for the additional width in the opening
for the wall case. The duct adapter mounting brackets
should be mounted prior to installing the case in the wall.
Refer to pages 38 and 39 for drawings of ducted
installations.
Prior to the installation of the transition from the room
cabinet to the adapter, it will be necessary to remove the
discharge grille from the room cabinet. Instructions for this
modification are included with the duct adapter.
New Ducted Installations
Components
Duct Adapter RAK6052 - The duct adapter is secured to
each side of the wall case and requires the drilling of
mounting holes
in the wall case
during
installation.
A template for
the hole
location is in
the installation
instructions.
By securing
the duct
adapter to the
wall case, the chassis retains the slide-out feature for
servicing after the transition piece is removed.
Duct Extension RAK601 - This kit contains a 44" long
insulated duct, a register mounting collar, and an air supply
register. It can be secured to the duct adapter at either end
of the adapter. This duct may be cut at any dimension and
used in two applications providing the sum of the two duct
lengths necessary do not exceed the 44" length. Even in
single applications the mounting flange must be cut off one
end of the duct to accept the collar and supply register.
Duct Adapter RAK6052
Mounting Collar and Supply Register RAK602 These
components are included in the Duct Extension Kit
RAK601. They
may be ordered
separately for
installations
where two duct
extensions are
made from one
RAK601.
Ducted Application
Considerations
When designing a ducted application some application
considerations to be made include:
1. Do not exceed the 15 foot length maximum for the duct
extension. Field supplied duct extension must be
completely insulated with minimum of 1/2" insulation
2. The duct must be a straight run. Turns or bends in the
duct extension create air pressure drops that the unit is
not designed to overcome.
3. Minimum recommended clearance between the unit and
the adjacent wall is 2".
4. Provisions for return air must be made to allow air
circulation from secondary room. Doors in both
secondary and primary rooms may be undercut or a
return grille may be installed through a common wall.
5. When calculating the heat gain / heat loss take both areas
into consideration.
Replacements of Existing
Ducted Units
Since the design of the Zoneline chassis has changed over
the years to provide better performance and appearance,
some of the components used in ducted applications have
changed. Select the proper components from the
information below. The best procedure in determining the
correct kit is to measure duct extension cross section.
Flat Top-Discharge Units
(Zoneline Units Built Prior to 1988)
Existing Duct Extension Cross Section Measurements:
8-3/8" height x 6-1/2" width
Duct Adapter RAK7012 - This duct adapter will allow the
replacement of a new chassis (2500 or 3500 Series unit) into
an existing ducted application. This adapter will align
properly with the duct extension and will eliminate the need
to modify the wall opening. In order to minimize
replacement costs, some of the components of the old duct
adapter must be removed and used in the new installation.
Consult the Installation Instructions of the RAK7012 before
removing and discarding the old duct adapter. See
additional notes page 58.
Slope-Front Discharge Units
(Models With AZC, AZR, AZW, or AZ21 or AZ31 Prefix)
Existing Duct Extension Cross Section Measurements:
7-3/32" height x 6-1/2" width
Duct Transition RAK7022 - This duct transition will allow the
replacement of a new slope-front discharge Zoneline chassis
(2500 or 3500 Series unit) into a previous design slope-front
ducted installation. See additional notes page 58.
RAK601 Duct Extension,
Mounting Collar and Register
37