3
WARNING
The first 6 inches of supply air plenum and ductwork must be
constructed of sheet metal as required by NFPA 90B. The supply
air plenum or duct must have a solid sheet metal bottom directly
under the unit with no openings, registers or flexible air ducts
located in it. If flexible supply air ducts are used
,
they may be
located only in the vertical walls of rectangular plenum, a minimum
of 6 inches from the solid bottom. Metal plenum of duct may be
connected to the combustible floor base, if not, it must be
connected to the unit supply duct exposed to the supply air opening
from the downflow unit. Exposing combustible (non-metal) material
to the supply opening of a downflow unit can cause a fire resulting
in property damage, personal injury or death.
Exception warning to downflow:
Installations on concrete floor slab with supply air plenum and
ductwork completely encased must be not less than 2 inches of
concrete (See NFPA 90A).
The unit can be positioned for bottom return air in the upflow position,
left and right return in the horizontal position, top return in downflow
position.
This Air Handler provides the flexibility for installation in any upflow or
downflow horizontal application. The direct drive motors provide a
selection of air volume to match any application. 3-Speed motors
provide selections of air flow to meet desired applications.
Top and side power and control wiring, accessible screw terminals for
control wiring all combine to make the installation easy, and minimize
installation cost. See Fig.6.
2. GENERAL
CAUTION
Make sure the blower motor
support is tight (3-motor mount
bolts) then check to see if
wheel is secured to motor
shaft before operating unit.
To ensure the proper installation, select a solid and level site.
Ensure enough space maintained for installation and maintenance.
≥40’’
≥
25’’
≥40’’
≥0
≥0
≥0
AIRFLOW
Front of unit
Fig.2 CLEARANCES IN THE HORIZONTAL POSITION
Fig.3 CLEARANCES IN THE VERTICAL POSITION
Do not install unit in an area where flammable materials are present
due to the risk of an explosion resulting in serious injury or death.
WARNING
If the supporting structural members are not strong enough to take
the unit’s weight, the unit could fall out of place and cause serious
injury.
If a return-air duct is not installed, carefully select the place and
method of product installation so that air flow into the product will not
be blocked.
The unit should be installed in a level position to ensure proper
condensation drainage. Up to an additional ¼" rise over the width or
depth of the unit is allowed to create additional sloping towards the
drain. Unit must be positioned between level and ¼" rise, sloping
toward the drain connections.
Install the indoor and outdoor unit, power supply wiring and
connecting wires at least 3.5 ft. away from televisions or radios in
order to prevent image interference or noise.
Fig.1 CHECKING MOTOR FIX STATUS
See Fig.2 and Fig.3.
