Lennox Signature XP21 Series Installation And Service Procedure page 9

STABILIZING UNIT ON UNEVEN SURFACES
IMPORTANT
Unit Stabilizer Bracket Use (field−provided):
Always use stabilizers when unit is raised above the
factory height. (Elevated units could become unstable in
gusty wind conditions).
Stabilizers may be used on factory height units when
mounted on unstable an uneven surface.
1. Remove two side louvered panels to expose the unit
base.
2. Install the brackets as illustrated in figure 5, detail D us-
ing conventional practices.
3. Replace the panels after installation is complete.
ROOF MOUNTING
NOTICE
Roof Damage!
This system contains both refrigerant and oil. Some
rubber roofing material may absorbed oil and cause the
rubber to swell when it comes into contact with oil. The
rubber will then bubble and could cause leaks. Protect
the roof surface to avoid exposure to refrigerant and oil
during service and installation. Failure to follow this
notice could result in damage to roof surface.
Install the unit a minimum of six inches (152 mm) above the
roof surface to avoid ice build−up around the unit. Locate
the unit above a load bearing wall or area of the roof that
can adequately support the unit. Consult local codes for
rooftop applications.
If unit coil cannot be mounted away from prevailing winter
winds, a wind barrier should be constructed. Size barrier at
least the same height and width as outdoor unit. Mount bar-
rier 24 inches (610 mm) from the sides of the unit in the
direction of prevailing winds.
PREVAILING WINTER
WINDS
INLET AIR
Figure 4. Rooftop Application and Wind Barrier
Page 9
WIND BARRIER
INLET AIR
INLET AIR
24"
(610)
XP21