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Installation Clearances
NON-DUCTED RETURN CLOSET INSTALLATION
The air handler can be installed in a closet with a false
bottom to form a return air plenum. It may also be installed
with a return air plenum under the air handler.
Louvers or return air grilles are field‐supplied. Local codes
may limit application of systems without a ducted return to
single-story buildings.
When a CBX25UH unit is installed in a closet with a
louvered return opening, the minimum open area for the
louvers will be:
S 320 square inches for -018 and -024 models;
S 360 square inches for -030 and -036 models;
S 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 flow 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 flow of return air.
Installation
Each unit consists of a blower assembly, refrigerant coil,
and controls in an insulated galvanized steel
factory-finished enclosure. Knockouts are provided for
electrical wiring entrance.
For ease in installation, it is best to make any necessary
coil configuration changes before setting air handler in
place.
REFRIGERANT METERING DEVICE
CBX25UH 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 floor or field‐supplied support frame.
Securely attach the air handler to the floor or support
frame.
2. If installing a unit in an upflow application, remove the
horizontal drain pan. IMPORTANT - The horizontal
drain pan is not required in upflow air discharge
installations; its removal provides the best
efficiency and air flow.
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 floor. This will allow proper
air return.
HORIZONTAL DRAIN PAN
IMPORTANT! REMOVE PAN
FOR BEST EFFICIENCY
AND AIR FLOW.
UPFLOW
DRAIN PAN
UPFLOW DRAIN
CONNECTIONS (BOTH
SIDES; USE ONE SIDE
OR OTHER)
HORIZONTAL DRAIN
CONNECTIONS
(BOTH SIDES; NOT
USED)
Figure 1. Upflow Configuration
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
applications, 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 support
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.
LEFT-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 drain pan end of
the unit (see figure 11).
4. The horizontal configuration is shown in figure 2.
Drains
AIR FLOW
PLUGS
LEFT‐HAND DRAINS
Figure 2. Left‐Hand Discharge Configuration
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