Page 5
Installation Applications
Roof Top
•For roof top installations, the roof must have sufficient struc-
tural strength to support the load. FHA approved construction
and local codes are normally adequate provided the roof joists
and rafters have a proportionally distributed load. See Figure 2.
•The unit should be positioned for recommended clearances as
previously outlined under "Location and Recommendations"
•If duct hood or supply and return ducts are fabricated by the
installing contractor, be sure that the portion of the supply and
return ducts located outdoors is as short as possible. The supply
duct, return duct, and connectors should be insulated with 2"
insulation and weatherproofed. Be sure the openings in the
structure for the supply and return ducts are large enough to
include the insulation.
•Use turning vanes inside the supply and return ducts when
using a square elbow take-off from the unit.
•Vibration isolators are recommended to prevent transmission
of vibration to the structure. Isolate with at least four (4)
vibration isolators or equivalent. The isolators must provide a
minimum clearance of 1/4" beneath the unit to permit air to
circulate under the unit's base.
•After the unit has been properly positioned, complete the
installation according to the instructions in the following sec-
tions of this manual. Then follow the Start-Up procedure on
page 7 and the operational check on page 9 of this manual.
Ground Level - Outdoor
For ground level installations, position the unit on a pad at least
two (2) inches larger than the unit on all sides. The unit must be
level on the pad. The pad must not contact the structure. Be sure
the outdoor portion of the supply and return air ducts are as
short as possible.
The installation should proceed as follows:
•The unit must be isolated with mounting pads. The mounting
pads must provide a minimum of 1/4" clearance beneath the unit
to permit air circulation and prevent corrosion of the base. See
Figure 3.
•Attach the supply and return air ducts to the unit. The portion
of the supply and return ducts located outdoors must be as short
as possible.
•Insulate any ductwork outside the structure with at least two
(2) inches of insulation and weatherproofing. Be sure the
openings in the structure are large enough to include ducts and
insulation.
•Complete the installation according to the instructions in the
following sections of this manual.
Typical Rooftop Application
Typical Gound Level Application
3
/
4
" PVC OR COPPER
TUBING AND FITTINGS
QTY.
1
3
1
1
2
1
MATERIALS
TEE
90˚ ELL
PLUG
4" NIPPLE
2" NIPPLE
3/4" NPT TO PVC OR
COPPER ADAPTER
2" MIN.
2" MIN.
FROM DWG. 21C128186 FIG 1, R1
2
3
4
DISCHARGE AIR
DISCHARGE AIR
A 3/4-inch female NPT condensate drain connection is provided
on the evaporator end of the unit. See Figure 1. Provide a trap
and fill it with water before starting the unit to prevent air from
being drawn through. Follow local codes and standard piping
practices when running the drain line Pitch the line downward
away from the unit. Avoid long horizontal runs. See Figure 6.
NOTE: Do not use reducing fittings in the drain line. The
condensate drain must be:
•Made of 3/4" pipe.
•Pitched 1/4" per foot to provide free drainage to a convenient
drain system
•Trapped
•Not connected to a closed drain system.
•If an external drain pan is installed, do not connect the drain
pipes. Do not trap the external drain pan pipe.
Condensate Drain Piping
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