UNIT LOCATION
TO PREVENT POSSIBLE EQUIPMENT DAMAGE, PROPERTY DAMAGE, PERSONAL
INJURY OR DEATH, THE FOLLOWING BULLET POINTS MUST BE OBSERVED
WHEN INSTALLING THE UNIT.
IMPORTANT NOTE: Remove wood shipping rails prior to installa-
tion of the unit.
A L L INSTALLATIONS:
• For proper flame pattern within the heat exchanger and
proper condensate drainage, the unit must be mounted
level.
• The flue outlet hood must be at least 12 inches from any
opening through which flue gases could enter a building,
and at least three feet above any forced air inlet located
within ten feet The economizer/manual fresh air intake/
motorized fresh air intake and combustion air inlet mounted
on the unit are not affected by this restriction.
• To avoid possible corrosion of the heat exchanger, do not
locate the unit in an area where the outdoor air (i.e.
combustion air for the unit) will be frequently contaminated
by compounds containing chlorine or fluorine. Common
sources of such compounds include swimming pool
chemicals and chlorine bleaches, paint stripper, adhesives,
paints, varnishes, sealers, waxes (which are not yet dried)
and solvents used during construction and remodeling.
Various commercial and industrial processes may also
be sources of chlorine/fluorine compounds.
• To avoid possible illness or death of the building occupants,
do NOT locate outside air intake device (economizer,
manual fresh air intake, motorized fresh air intake) too
close to an exhaust outlet, gas vent termination, or
plumbing vent outlet. For specific distances required,
consult local codes.
• Allow minimum clearances from the enclosure for fire
protection, proper operation, and service access (see
appendix). These clearances must be permanently
maintained.
• The combustion air inlet and flue outlet hoods on the unit
must never be obstructed. If used, do not allow the
economizer/manual fresh air damper/ motorized fresh air
damper to become blocked by snow or debris. In some
climates or locations, it may be necessary to elevate the
unit to avoid these problems.
• When the unit is heating, the temperature of the return air
entering the unit must be between 50° F and 100° F.
G R O U N D LEVEL INSTALLATIONS O N L Y :
• When the unit is installed on the ground adjacent to the
building, a level concrete (or equal) base is recommended.
Prepare a base that is 3" larger than the package unit
footprint and a minimum of 3" thick.
• The base should also be located where no runoff of water
from higher ground can collect in the unit.
Outside Slab Installation
R O O F T O P INSTALLATIONS O N L Y :
• To avoid possible property damage or personal injury, the
roof must have sufficient structural strength to carry the
weight of the unit(s) and snow or water loads as required by
local codes. Consult a structural engineer to determine the
weight capabilities of the roof.
Rooftop Installation
• The unit may be installed directly on wood floors or on Class
A, Class B, or Class C roof covering material.
• To avoid possible personal injury, a safe, flat surface for
service personnel should be provided.
ROOF CURB INSTALLATIONS ONLY:
• Sufficient structural support must be determined prior to
locating and mounting the curb and package unit.
• Ductwork must be constructed using industry guidelines. The
duct work must be placed into the roof curb before mounting
the package unit.
• Curb insulation, cant strips, flashing and general roofing
material are furnished by the contractor.
