6
All servicing and cleaning of the air handler can
be done from the front. Adequate horizontal
clearances should be provided to allow for
service and care of the unit. A minimum 24 inch
clearance at the front of the unit is recommended.
These units are suitable for attic, closet, crawl
space or alcove installation at zero clearance
from combustibles.
Condensate Drain — The condensate pan
has primary and secondary drain connections.
The connections have 3/4 inch female pipe
threads.
All condensate drains should be a minimum
of 3/4 inch PVC pipe or equivalent. The drain
should maintain a minimum horizontal slope in
the direction of discharge of not less than 1 inch
vertical for every 10 feet of horizontal.
If the air handler is located in or above a living
space where damage may result from conden-
sate overflow, an auxiliary drain pan shall be
installed under the unit. A separate drain line
should extend from the pan to a conspicuous
point and serve as an alarm indicating that the
primary drain is restricted. As an alternative to
a separate drain line, an approved water level
indicator or float switch device should be used to
shut down the unit in the event water is detected
in the auxiliary pan.
Install a 5 inch trap in the condensate drain
line as close to the coil as possible. Make sure
that the top of the trap is below the bottom of
the drain pan to prevent the condensate from
overflowing the drain pan. Prime the trap with
water. Insulate the drain if it is located in an
unconditioned space, and test the condensate
line for leaks. Consult local codes for additional
restrictions or precautions.
NOTE: There must be only one trap in the drain
line. Using more than one trap may prevent
drainage.
IMPORTANT:
The plastic drain pan must be level
or slightly sloped toward the drain
lines.
3. AIR DUCTS, FILTERS,
HORIZONTAL APPLICATIONS
Air ducts should be installed in accordance with
the standards of the National Fire Protection
Association “Standard for Installation of Air
Conditioning and Ventilation Systems” (NFPA
90A), “Standard for Installation of Residence
Type Warm Air Heating and Air Conditioning
Systems” (NFPA 90B), these instructions, and
all applicable local codes.
Use transition fittings if the supply and/or return
air openings of the unit do not match the duct
openings. These transitions should be dimen-
sioned in accordance with standard practice as
specified in the ASHRAE recommendations for
duct transitions.
Flexible connectors should be used between the
unit and the ductwork to prevent transmission of
vibration from the unit to the structure.If electric
heater kits are installed, heat resistant material
must be used for the flexible connector at the
supply air end of the unit.
Air Filter Installation — The filter may be lo-
cated in the return air duct system or installed
into the air handler filter track located in the
bottom of the unit.
To install the filter, remove the filter door. The
filter sizes for the air handler cabinets are:
Cabinet Filter
A 12 x 20 x 1
B 18 x 20 x 1
C 20 x 20 x 1
WARNING:
Never operate the unit without a fil-
ter or with the doors removed. Dust
and lint in the return air can build up
on internal components, resulting
in a loss of efficiency, equipment
damage, and possible fire risk.
Upflow Applications — All air handlers are
factory shipped, ready for upflow configuration,
all return air must enter from the bottom of the
unit. A typical installation of the unit in a ducted
return air mode is shown in Figure 2.
Downflow Applications — The downflow
accessory kit (See Technical Specifications) is
required for downflow applications.Instructions
for installing the downflow accessory kit are
included with the kit. It is recommended that
the accessory be installed prior to installing
the unit. All return air in downflow applications
