4
•
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 unit clearances). These clearances must be
permanently maintained.
•
When the unit is heating, the temperature of the
return air entering the unit must be a minimum of 55°
F.
Ground Level Installations Only:
•
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.
Roof top Installations Only:
•
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.
•
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.
•
Adequate clearances from the unit to any adjacent
public walkways, adjacent buildings, building
openings or openable windows must be maintained
in accordance with National Codes.
Unit Precautions
•
Do not stand or walk on the unit.
•
Do not drill holes anywhere in panels or in the base
frame of the unit except where indicated. Unit access
panels provide structural support.
•
Do not remove any access panels until unit has been
installed on roof curb or field supplied structure.
•
Do not roll unit across finished roof without prior
approval of owner or architect.
• Do not skid or slide on any surface as this may
damage unit base. The unit must be stored on a flat,
level surface. Protect the condenser coil because it
is easily damaged.
Roof Curb Installations Only:
Curb installations must comply with local codes and should
be done in accordance with the established guidelines of
the National Roofing Contractors Association.
Proper unit installation requires that the roof curb be firmly
and permanently attached to the roof structure. Check for
adequate fastening method prior to setting the unit on the
curb.
Full perimeter roof curbs are available from the factory
and are shipped unassembled. Field assembly, squaring,
leveling and mounting on the roof structure are the
responsibility of the installing contractor. All required
hardware necessary for the assembly of the sheet metal
curb is included in the curb accessory.
WARNING
To prevent possible equipment damage, property damage,
personal injury or death, the following bullet points must
be observed when installing the unit.
•
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. Our full
perimeter curbs include duct connection frames to
be assembled with the curb. Cantilevered type curbs
are not available from the factory.
•
Curb insulation, cant strips, flashing and general
roofing material are furnished by the contractor.
•
The curbs must be supported on parallel sides by
roof members.
•
The roof members must not penetrate supply and
return duct opening areas as damage to the unit
might occur.
NOTE: The unit and curb accessories are designed
to allow vertical duct installation before
unit placement. Duct installation after unit
placement is not recommended.
CAUTION
All curbs look similar. To avoid incorrect curb positioning,
check job plans carefully and verify markings on curb as-
sembly. Instructions may vary in curb styles and supersedes
information shown.
See the manual shipped with the roof curb for assembly
and installation instructions.
