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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
CBX25UHV units are equipped with a check/expansion
valve, which is factory-installed internal to the cabinet.
UP-FLOW APPLICATION
1 - The air handler must be supported on the bottom only
and set on a solid floor or a field‐supplied support
frame. Securely attach the air handler to the floor or
support frame.
2 - If installing a unit in an up-flow application, remove the
horizontal drain pan.
IMPORTANT - The horizontal drain pan is not required in
up-flow air discharge installations. It must be removed
to provide the best efficiency and air flow.
3 - Place the unit in the desired location and properly
slope the unit (see page 8). Connect the return and
supply air plenums as required using sheet metal
screws.
4 - In applications that do not include a return air plenum,
install units on a stand that is raised at least 14" above
the floor. This ensures proper air return.
HORIZONTAL DRAIN PAN
IMPORTANT - REMOVE PAN
FOR BEST EFFICIENCY
AND AIR FLOW.
UP-FLOW
DRAIN PAN
UP-FLOW DRAIN
CONNECTIONS (BOTH
SIDES; USE ONE SIDE
OR OTHER)
Figure 1. Up-flow Configuration
HORIZONTAL APPLICATIONS
When removing the coil, there is a possibility of equip
ment damage and personal injury. Be careful when re
moving 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 re
moving 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
2 - With access door removed, remove drain line plugs to
3 - Set unit so that it is sloped toward the end of the unit with
4 - A typical horizontal configuration is shown in figure 2.
HORIZONTAL DRAIN
CONNECTIONS
(BOTH SIDES; NOT
USED)
Page 4
IMPORTANT
connections.
install drain lines.
the drain pan (see figure 14).
AIR FLOW
PLUGS
Figure 2. Left‐Hand Discharge Configuration
Drains
LEFT‐HAND DRAINS
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