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IV–CONFIGURATION MODIFICATIONS
CB29M and CB30M units may be installed in the upflow,
downflow, horizontal right–hand discharge or horizontal
left–hand discharge orientation.
The units come from the factory ready for upflow or
horizontal right–hand discharge installation. If the unit
needs to be modified from its original configuration,
use the following procedures. All procedures assume
the unit has not been modified from the factory.
A–Disassembly of CB30M Cabinet
For tight applications where a modular design is an
advantage, the CB30M unit can be easily disassembled
and reassembled. By removing four screws, the coil lifts
off so the unit is in two parts. To disassemble the CB30M,
use the following procedure.
1– Remove the two black screws located just above
the seam in the top half of the unit.
2– Remove the front access panel and remove the two
screws on the inside of the top half of the cabinet on
both sides.
3– Lift the top section apart from the bottom section.
4– To lighten the cabinet for lifting, the blower and coil
assemblies can also be removed.
5– Reassemble once the cabinet is in place.
B–Upflow Application
1– Discard drip shields, if applicable. The shields are
used for downflow applications only and are located
in shipping corner post of new units.
2– For best efficiency and air flow, the horizontal
drain pan should be removed from units in up-
flow configurations.
3– After removing horizontal drain pan, place unit in
desired location. Set unit so that it is level. Connect
return and supply air plenums as required using
sheet metal screws. See figure 11.
FIGURE 11
UPFLOW CONFIGURATION
*FOR OPTIMUM PERFORMANCE,
REMOVE HORIZONTAL DRAIN PAN.
HORIZONTAL
DRAIN PAN*
UPFLOW/
DOWNFLOW
DRAIN PAN
C–Downflow Application
1– Remove drip shields shipped in the right corner
packaging post. The shields are used for downflow
applications only and may need to be field fabricated
if no longer with unit.
2– Remove coil assembly from unit.
3– Remove horizontal drain pan. See figure 12.
FIGURE 12
HORIZONTAL
DRAIN PAN*
UPFLOW/
DOWNFLOW
DRAIN PAN
DOWNFLOW DISCHARGE CONFIGURATION
*FOR OPTIMUM
PERFORMANCE,
REMOVE
HORIZONTAL
DRAIN PAN.
4– Rotate cabinet 180
from upright. It may be nec-
essary to first remove the blower assembly to
lighten the cabinet for lifting.
5– Install downflow drip shield firmly in place on inside
of coil slab from under drain pan. See figure 13.
DRIP SHIELDS
DOWNFLOW DRIP SHIELDS
FIGURE 13
6– Replace coil assembly and blower if removed. Re-
place coil access panel. If horizontal drain pan is
not removed, depress tab in cabinet support rail to
hold horizontal drain pan in place. See figure 12.
7– Set unit so that it is level. Connect return and supply
air plenums as required using sheet metal screws.
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For downflow installation on combustible flooring, an
additive base must be used. See figure 14.
Summary of Contents for CB29M-21
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