Lennox Dave Signature XP21 Installation Instructions Manual page 4

STEP 1 -- SETTING THE UNIT (Continued) -- Unit Placement
DETAIL D
— Slab Mounting
#10 X 1/2" LONG SELF-DRILLING
SHEET METAL SCREWS
STABILIZING BRACKET
(18 GAUGE METAL — 2" WIDTH;
HEIGHT AS REQUIRED)
#10 X 1-1/4" LONG HEX HD SCREW
AND FLAT WASHER
Concrete slab — use two plastic anchors
(hole drill 1/4")
DETAIL E
Stabilizing bracket (18 gauge metal — 2" [50.8mm] width; height as required); bend to form
right angle as shown below.
DETAIL F
— Wind Barrier
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 coil must be installed facing prevailing winter
winds, a wind barrier should be constructed. Size
barrier at least the same height and width as out­
door unit. Install barrier 24 inches (610 mm) from
the sides of the unit in the direction of prevailing
winds.
STABILIZING UNIT ON UNEVEN SURFACES
COIL
BASE PAN
CORNER POST
— Deck Top Mounting
SAME FASTENERS AS
SLAB SIDE MOUNTING.
FOR EXTRA
Install one bracket per side (minimum). For extra stability, install
two brackets per side, two inches (51mm) from each corner.
FIGURE 5
Page 4
!
Unit Stabilizer Bracket Use
Always use stabilizers when unit is
raised above the factory height.
(Elevated units could become unsta­
ble in gusty wind conditions.)
Stabilizers may be used on any unit
installed on unstable and uneven
surfaces.
MINIMUM ONE
PER SIDE
STABILITY
PREVAILING WINTER
WINDS
INLET AIR
INLET AIR
IMPORTANT !
(field-provided):
WIND BARRIER
INLET AIR
24"
(610)