Lennox CBA25UHV User Manual

Page 4
Louvers or return air grilles are eld-supplied. Local codes
may limit application of systems without a ducted return to
single-story buildings.
When a CBA25UHV unit is installed in a closet with a lou-
vered return opening, the minimum open area for the lou-
vers will be:
• 320 square inches for -018 and -024 models;
• 360 square inches for -030 and -036 models;
• 450 square inches for -042 thru -060 models
If the free area is not known, assume a 25% free area for
wood or a 75% free area for metal louvers or grilles. Using
the louver dimensions and the 25% or 75% assumption,
determine if the open area meets the minimum open area
listed above.
If a return air plenum is used, the return air grille should be
immediately in front of the opening in the plenum to allow
for the free ow of return air. When not installed in front of
the opening, there must be adequate clearance around
the air handler to allow for the free ow of return air.
Installation
Each unit consists of a blower assembly, refrigerant coil,
and controls in an insulated galvanized steel factory-n-
ished enclosure. Knockouts are provided for electrical wir-
ing entrance.
For ease in installation, it is best to make any necessary
coil conguration changes before setting air handler in
place.
REFRIGERANT METERING DEVICE
CBA25UHV units are equipped with a factory-installed
check/ expansion valve.
UPFLOW APPLICATION
1 - The air handler must be supported on the bottom
only and set on solid oor or eld-supplied support
frame. Securely attach the air handler to the oor or
support frame.
2 - If installing a unit in an upow application, remove
the horizontal drain pan. IMPORTANT - The
horizontal drain pan is not required in upow
air discharge installations; its removal provides
the best e󰀩ciency and air ow.
3 - Place the unit in the desired location and slope unit.
Connect return and supply air plenums as required
using sheet metal screws.
4 - Install units that have no return air plenum on a
stand that is at least 14" from the oor. This will
allow proper air return.
HORIZONTAL DRAIN PAN
(MUST BE REMOVED)
UP-FLOW /
DOWN-FLOW
DRAIN PAN
FIGURE 1. Upow Conguration
HORIZONTAL APPLICATIONS
IMPORTANT
When removing the coil, there is a possibility of danger
of equipment damage and personal injury. Be careful
when removing the coil assembly from a unit installed in
right- or left-hand applications. The coil may tip into the
drain pan once it is clear of the cabinet. Support the coil
when removing it..
NOTE - When the unit is installed in horizontal applica-
tions, a secondary drain pan is recommended. Refer to
local codes.
NOTE - This unit may be installed in left-hand or right-
hand air discharge horizontal applications. Adequate sup-
port must be provided to ensure cabinet integrity. Ensure
that there is adequate room to remove service and access
panels if installing in the horizontal position.
RIGHT-HAND DISCHARGE
1 - Determine which plugs are required for drain line
connections.
2 - With access door removed, remove drain line plugs
to install drain lines.
3 - Set unit so that it is sloped toward the upow drain
pan end of the unit and level from front to back of
unit (see gure 7).
4 - The horizontal conguration is shown in gure 2.
Drains
AIR FLOW
PLUGS
RIGHT‐HAND DRAINS
FIGURE 2. Right-Hand Discharge Conguration

Lennox CBA25UHV Specifications

General

Type	Air Handler
Model	CBA25UHV
Brand	Lennox
Efficiency	Up to 16 SEER
Refrigerant	R-410A
Nominal Voltage	208/230V
Width	21 inches
Compatibility	Compatible with Lennox outdoor units
Nominal Cooling Capacity	1.5 to 5 tons
Motor Type	PSC or ECM
Airflow Range	Up to 2000 CFM
Motor	Variable Speed Motor