9
Snowfall
> 12 in. (305 mm)
Additional Rooftop Mounting Guidelines
• The low ambient cooling hood increases the overall
height of the unit and therefore makes it more suscep-
tible to wind stresses. Ensure that unit is secured to
its support using either lag bolts or safety strap. See
Figures 5, 6 and 7.
• Outdoor units should be located in an area protected
from prevailing winds. Hood discharge should be di-
rected away from or perpendicular to the prevailing
winds; never toward prevailing winds.
•
Add an additional 12 in. (305 mm) to the standard
mounting clearances. See Page 6.
• For all roof top and other high wind installa-
tions, weather resistant safety straps must
be securely fastened between the discharge
air hood and the equipment support system.
Straps should not be installed where ser-
vice access is impeded or restricted.
Straps should be a minimum 3/16” vinyl coated cable.
See Figures 6 and 7.
• Straps must be attached to the hood where they
will not interfere with the movement of the dampers.
Attachment to both the hood and mounting structure
is to be with a bolt through connection using a bolt ¼”
or larger in diameter.
Weather Resistant
Safety strap
Figure 4. Elevate Unit Above Snow Level
Figure 5. Secure Unit to Weather Resistant Support
Φ 3/8 in (10 mm)
Lag
bolt
Figure 6. Secure Unit with Safety Strap (Back)
Due to wind resistant construction, Low ambient cool-
ing kits are better suited for ground level applications.
Should low ambient applications require the outdoor unit
to be installed in elevated areas such as a roof top it is im-
portant to follow all installation guidelines and to observe
local and national equipment fastening guidelines.
Figure 7. Secure Unit with Safety Strap (Sides)
• The outdoor unit and equipment support should be
firmly attached to the structure. Or, if the equipment
support is the type that does not attach to the struc-
ture, refer to the equipment support manufacturer’s
guidelines for proper size and construction.
• Depending on location, exposure and other factors in-
fluencing the wind, Additional support (or cables) may
be required.
