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504954M 08/06
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. Re-
fer 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 4.
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
prevailing winter
winds
Rooftop Wind Barrier Construction
inlet air
Figure 4
24"
(610
mm)
inlet air
inlet air
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
Electric Shock Hazard. Can cause in-
jury or death. Unit must be grounded
in accordance with national and local
codes.
Line voltage is present at all compo-
nents when unit is not in operation on
units with single-pole contactors. Dis-
connect all remote electric power sup-
plies before opening access panel.
Unit may have multiple power sup-
plies.
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.
NOTE − Connect conduit to the unit using a proper
conduit fitting. Units are approved for use only with
copper conductors. Refer to figure 5 for high voltage
field wiring diagram. A complete unit wiring diagram is
located on the back side of the unit’s access panel.
Typical Field Wiring Diagram
Figure 5
L2
L1
208−
230/
60/1
READ
WARNING
AND NOTE
GND
WARNING! − ELECTRIC SHOCK HAZARD. Can cause INJURY or
DEATH. Unit must be grounded in accordance with national and local
codes.
NOTE − For use with copper conductors only. Refer to unit rating
plate for minimum circuit ampacity and maximum over-current
protection size.
NOTE − For proper voltages, select thermostat wire
gauge per the following chart:
Wire run length
AWG #
Insulation type
less than 100’ (30m)
18
color−coded, temperature
º
more than 100’ (30m)
16
color coded, temperature
rating 35
º
C minimum
3. Install room thermostat (ordered separately) on an in-
side wall approximately in the center of the conditioned
area and 5 feet (1.5 m) from the floor. It should not be
installed on an outside wall or where it can be effected
by sunlight, drafts or vibrations.
4. Install low voltage wiring from outdoor to indoor unit
and from thermostat to indoor unit. See figures 6
through 8.
NOTE − 24V, Class II circuit connections are made in
the low voltage junction box.
