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38
DUCTED INSTALLATIONS
4100 and 6100 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 installed in the discharge duct of the
adapter is provided from the factory to provide approximately
35% air discharge into the primary room (room in which the
unit is installed) and 65% into the secondary (adjacent) room.
To increase the amount of air discharged into the primary
room, the damper may be modified by removing the discharge
grille on top of the adapter and folding over (or cutting off) the
scored section of damper to provide approximately a 50/50
split. Completely removing the discharge damper will result in
approximately 75% air discharge into the primary room and
25% into 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 39 and 40 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 does 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.
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. Turn the “Duct Mode” on in the auxiliary control settings
(Mode 7). This increases the fan speed to ensure proper
circulation.
4. Minimum recommended clearance between the unit and
the adjacent wall is 2".
5. 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.
6. 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
the existing 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 (4100 or 6100 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 notes on page 58.)
Slope-Front Discharge Units (AZ series models)
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
(4100 or 6100 Series unit) into a previous-design slope-front
ducted installation. (See notes on page 58.)
Duct Adapter
RAK6052
Duct Extension,
Mounting Collar and
Register RAK601
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