Installation Guide

5
2. Select a location that will minimize the length of the supply and
return ducts.
3 Select a location where external water drainage cannot collect
around the unit.
4. Consideration should also be given to shade, appearance and noise.
Rooftop Installation (Figure 2)
1. Before locating the unit on the roof, make sure that the strength
of the roof and beams is adequate to support the weight involved.
(See specification sheet for weight of units.) This is very important
and the installer’s responsibility.
2. Make proper consideration for the weather–tight integrity of the
roof and proper drainage of condensate.
3. To ensure proper condensate drainage, unit must be installed in a
level position.
4. Consideration should also be given to shade, appearance and noise.
DUCTING
Ducting work should be fabricated by the installing contractor
in accordance with local codes. Industry manuals may be used
as a guide when sizing and designing the duct system- such
as NESCA (National Environmental Systems Contractors
Association, 1501 Wilson Blvd., Arlington, Virginia 22209).
The unit should be placed as close as possible to the space
to be air-conditioned allowing clearance dimensions as
indicated. Ducts should run as directly as possible to supply
and return outlets. Use of non-flammable weatherproof
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 in the wall or ceiling. A
slab installation is recommended when the registers are low on
the wall or in the floor.
Connecting the Return and Supply Flexible Duct in
Manufactured or Modular Housing Application
The return and supply fittings are to be attached at the unit to
a suitable square to round duct converter. Your distributor has
a factory designed square to round converter transition. The
model #’s of these kits are as follows: Small Chassis 25”
SQRPCH101, Medium Chassis 27.5” SQRPCH102, Large and
Extra Large Chassis 32.5:” and 36” SQRPCH103 (See
Specification Sheets for Dimension details). The SQRPCH101 has 14" duct collar on supply and 16" duct collar
(equivalent diameter, opening is oval) on the return. The SQRPCH102 and SQRPCH103 have 14" duct collar on
supply and 18" duct collar (equivalent diameter, opening is oval) on the return. The collars are to be slipped into the
openings, and the flanges bent around the converter. The square to round converter is attached to the flanges of
the square duct openings. The flexible duct is then clamped on to the collars. Once the duct is affixed to the unit,
seal the collars and flanges with a proper waterproof sealant (See Figure 3).
It is strongly encouraged to use appropriately sized ducts based upon the CFM for your application (unit’s CFM). If
duct sizing through industry manuals or air duct calculators require larger ducts than converter openings, run larger
duct size up to unit converter openings and reduce with a reducer duct fitting or transition right at the unit.
36"
36"
24"
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FIGURE 2
WARNING
D O NOT , UNDER ANY CIRCUMSTANCES , CONNECT RETURN DUCT -
WORK TO ANY OTHER HEAT PRODUCING DEVICES SUCH AS FIRE -
PLACE INSERT , STOVE , ETC . U NAUTHORIZED USE OF SUCH DEVICES
MAY
RESULT IN PROPERTY DAMAGE , FIRE , CARBON MONOXIDE
POISONING
, EXPLOSION , PERSONAL INJURY OR DEATH .
NOMINAL SIZE (INCHES) NOMINAL AREA (SQ. FT.)
10x20 1.4
14x20 1.9
14x25 2.4
15x20 2.1
16x20 2.2
16x25 2.8
20x20 2.8
20x25 3.5
25x25 4.3
MINIMUM FILTER SIZE
TABLE 1