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24
Sub-Base (Cont.)
There are separate internal compartments to permit
separation of low voltage (Class 2) connections from line
voltage connections as required by NEC. Conduit containing
building wiring enters the sub-base through knockouts
located in the rear or bottom of the sub-base and is not
accessible when the wall case is installed.
The sub-base attaches to the RAB71 wall case with two clips
(field assembled) that are screwed into pre-drilled holes in
the bottom front flange of the wall case. It attaches to the
RAB77 wall case with clips that fit over molded ribs without
requiring the use of screws into the wall case. See page 33
for illustration. Since the sub-base extends under the wall
case, clearance from the inner edge of the wall case to the
finished wall must be 2-3/8" or greater. The sub-base has 4
leveling legs and adjustable side channels to enable the area
under the wall case to be enclosed. Clearance from the
bottom edge of the wall case to the finished floor must be
between 3" and 5".
The sub-base may be used as support for the chassis and wall
case in installations where the wall is of insufficient thickness
to provide secure mounting of the wall case.
Wall Case Installation Data
General
Generally, Zoneline units are installed 3" to 5" above the
floor (flush to finished floor installation is possible) as near
to the center of the room as possible; underneath a window
or a glass panel is typical. Normal installation of the wall case
allows installation flexibility; from flush with the finished
interior wall to a minimum of 1/4" of the wall case
extending beyond the finished exterior of the building.
Special consideration must be given to installations where
the wall case does not extend a minimum of 1/4" beyond
the finished exterior wall. See pages 30 and 31 for
information on this type of installation. The unit may be
installed high in the wall and these installations usually
require a remote thermostat and are discussed on
pages 17 and 18.
Regardless of the installation, there are several things to
consider when selecting a location for installing the unit. For
instance, drapery location could interfere with air discharge,
and placement of furniture may have an impact on the
performance of the unit. The following information is
intended to minimize installation problems and assure you
of trouble-free installation.
Refer to page 22 for required wall opening dimensions.
Minimum recommended interior and exterior case
projection for standard wall thicknesses are shown in the
drawings in this manual. The case may be installed flush
with the finished indoor wall. Special attention must be paid
to room-side case projection when the unit is installed in a
ducted application as shown on page 39.
In walls thicker than 13 1/2" for line cord connected units
and 11 1/8" for sub-base installations, it may be necessary to
install a field fabricated case extension or use one of the
special order RAB71 deep wall cases. If you are unable to
locate a local source for case extensions please contact your
salesperson for a possible supplier. Such extension must be
carefully flashed and sealed both to the wall case and to the
wall to insure water integrity. This is necessary to insure that
any water entering the wall case, either from operation of
the unit or from other sources, such as rain storms or from
washing the exterior of the building, will drain from the case
without the possibility of capillary action drawing the water
into either the room or the wall cavity. In an installation
where the case is recessed less than 3" from the outside
surface, flashing and sealing may be all the modificaton
necessary. In such an installation, the sides and top of the
wall opening must be waterproof to prevent moisture from
seeping into and damaging the walls. See Pages 30 and 31
for suggested detail. Since the installation of a case
extension requires a considerable amount of attention, we
recommend using one of the deep wall cases if the standard
case is not of sufficient depth.
Mounting an outdoor grille or louver section to the building
face may cause a space between the outdoor coil and the
louver section. Air splitters, aligned with the ends of the
outdoor coil, must be installed between the outdoor coil
inlet and outlet air streams. Gaps between the outdoor coil
and the louver section may allow condenser air recirculation
and affect the operation of the unit. See page 40 for
requirements for custom louver sections.
The wall case should be level from side to side and from
level to 1/4 bubble tilt to the outdoors. The condensate
disposal system in the unit is designed to dissipate the
condensate water generated during cooling operation in
accordance with ARI standards and actually uses this
water for maximum unit efficiency. A level unit will also
insure proper performance of the Internal Condensate
Removal (ICR) system optional on heat pump units.
For new construction, early planning with the architect is
necessary. Unit location, electrical connection locations, and
wall openings of the proper dimensions are essential to
avoid the necessity of rework, fillers, framing, moving
electrical outlets, and other expensive modifications.
For existing construction it is important that carpentry,
masonry and electrical work be performed by competent,
qualified personnel. Since installations in existing
construction may involve removal of building material from
the structure, locating the wall case must be done correctly.
Window, Curtain and Panel Wall Construction
With this type of construction, provision for support of the
unit, other than by the wall itself, is often required. Such
support may be in the form of wood or metallic material of
the proper thickness to maintain a level case. This additional
support should be located both near the wall and at the
front of the wall case. Sub-base (RAK204 Series) with four
leveling legs provides an excellent support for the unit in
this type of installation. See page 28 for details of this type of
installation.
In existing construction, common practice is to remove a
pane of glass, metal, wood, or other construction material
and build a frame around the wall case. Similar filler panel
material may be installed around the case for appearance
and weather seal.
2020 Data Manual 2002 11/7/02 3:19 PM Page 24
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