Page 5
CB(X)26UH SERIES
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 CON-
NECTIONS (BOTH
SIDES; USE ONE SIDE
OR OTHER)
HORIZONTAL DRAIN
CONNECTIONS
(BOTH SIDES; NOT
USED)
Figure 3. Upflow Configuration
HORIZONTAL APPLICATIONS
IMPORTANT
When removing the coil, there is possible 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.
FRONT VIEW
END VIEW
ANGLE IRON OR SHEET
METAL
E
LECTRICAL INLET CLEAR-
ANCE 4 IN. (102 MM)
1/2 IN. SCREWS
MAX.
AIR FLOW
Figure 4. Suspending Horizontal Unit
NOTE When the unit is installed in horizontal
applications, a secondary drain pan is recommended.
Refer to local codes.
NOTE For applications where return air ducting is to be
connected to the bottom of the coil blower, Lennox offers a
duct adapter kit which mounts on the filter door side of the
end of the unit (shown in figure 2). This provides a metal
edge for attaching the return air duct. One duct adapter
and two self−tapping screws are needed for each
installation. Packages of 10 adapters/20 screws are
available: 0658731−85 (Catalog No. X8103) for the
−018/−024 size units; 0658731−86 (Catalog No. X8104) for
the −030 to −060 size units.
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.
1. Determine whether left-hand or right-hand air
discharge is required. If right-hand is required, perform
Right−Hand Discharge Modification
on page 6.
2. Determine knockouts required for drain line
connections.
3. With access door removed, knock out drain line
opening for installing drain lines.
4. Set unit so that it is sloped toward the drain pan end of
the unit (see figure 10 on page 7).
5. The horizontal configuration is shown in figure 5.
6. If the unit is suspended, the entire length of the cabinet
must be supported. If you use a chain or strap, use a
piece of angle iron or sheet metal attached to the unit
(either above or below) to support the length of the
cabinet. Use securing screws no longer than 1/2 inch
to avoid damaging the coil or filter. See figure 4. Use
sheet metal screws to connect the return and supply
air plenums as required.
Drains
AIR FLOW
KNOCKOUT
LEFT-HAND DRAINS
Figure 5. Left-Hand Discharge Configuration
RIGHT−HAND AIR DISCHARGE MODIFICATION
For horizontal right−hand air discharge, the following field
modifications are required.
1. Remove and set aside blower and coil access covers.
2. Remove the coil support bracket (detail A, figure 7).
3. Remove coil assembly, bottom drain pan and
horizontal drain pan as one assembly from the air
handler.
4. Remove two screws, blow off prevention bracket
(where used; see table 2), and horizontal drip shield.
Rotate the brackets 180º and reinstall using the same
screws.
5. Move the horizontal drain pan to the opposite side of
the coil. Be sure drain holes toward the back of the unit
are plugged (see figure 8). Remove the plugs from the
front drain pan ports.
6. Re−install modified coil/drain pan assembly in air
handler in the same orientation as before.
