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5 − Locate unit away from overhanging roof lines which
would allow water or ice to drop on, or in front of, coil or
into unit.
Slab Mounting
When installing unit at grade level, top of slab should be
high enough above the grade so that water from higher
ground will not collect around unit. See figure 3. Slab
should have a slope tolerance away from the building of 2
degrees or 2 inches per 5 feet (51 mm per 1.5 m). This will
prevent ice build−up under unit during a defrost cycle. Refer
to roof mounting section for barrier construction if unit must
face prevailing winter winds.
2 degrees or
2 in. per 5 foot
(51 mm per 1.5 m)
slope tolerance away
from building structure
Slab Mounting
ground level
mounting
slab
building
structure
discharge air
Figure 3
Roof Mounting
Install the unit a minimum of 6 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. See figure 3.
Size barrier at least the same height and width as outdoor
unit. Mount barrier 24 inches (610 mm) from the sides of the
unit in the direction of prevailing winds.
wind barrier
inlet air
prevailing winter winds
Rooftop Application
Wind Barrier Construction
inlet air
INLET
AIR
Figure 4
24"
(610 mm)
Electrical
In the U.S.A., wiring must conform with current local codes
and the current National Electric Code (NEC). In Canada,
wiring must conform with current local codes and the current
Canadian Electrical Code (CEC).
Refer to the furnace or blower coil installation instructions
for additional wiring application diagrams and refer to unit
nameplate for minimum circuit ampacity and maximum
overcurrent protection size.
WARNING
Unit must be grounded in accordance with national
and local codes.
ELECTRIC SHOCK HAZARD.
Can cause injury or death.
1 −Install line voltage power supply to unit from a properly
sized disconnect switch.
2 −Ground unit at unit disconnect switch or to an earth
ground.
