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CBWMV SERIES
tions with add−on cooling coils require field−fabricated tran-
sitions that provide at least 6 inches of clearance for the
CBWMV unit’s inlet/outlet water lines. See figure 2 for ex-
amples.
AIR
FLOW
AIR
FLOW
Figure 2
UPFLOW
RIGHT HAND DISCHARGE*
LEFT HAND DISCHARGE*
DOWNFLOW
CBWMV Multi−Positional Unit
DOWNFLOW BASE
* CBWMV units must not be installed horizontally on the front or
back of the unit.
AIR
FLOW
AIR
FLOW
Units may be horizontally installed in either attic or crawl
space.
CAUTION
CBWMV series units are shipped with an antifreeze
thermostat to prevent the water coil from freezing.
The freezestat is installed at the factory but must be
field wired (see figures 12 and 13). Do not bypass
this feature when you install or run the unit.
CAUTION
Use a drain pan for installations over finished living
areas.
Either suspend the unit from the roof rafters or floor joists
or mount on a platform. The CBWMV unit must be level
and well supported.
NOTE − 1/2 hp and 1 hp blower motors are equipped with
three flexible legs and one rigid leg. The rigid leg is
equipped with a shipping bolt and a flat white plastic wash-
er (rather than the rubber mounting grommet used with a
flexible mounting leg). The bolt and washer must be re-
moved before the air handler is placed into operation.
After the bolt and washer have been removed, the rigid leg
will not touch the blower housing.
Duct System
Use industry-approved standards (such as those pub-
lished by Air Conditioning Contractors of America or Amer-
ican Society of Heating, Refrigerating and Air Conditioning
Engineers) to size and install the supply and return air duct
system. This will result in a quiet and low-static system that
has uniform air distribution.
NOTE − Do not operate the air handler with an external
static pressure that exceeds 0.8 inches w.c. Higher exter-
nal static pressures may cause erratic operation.
Return Air Plenum
IMPORTANT
Return air must not be drawn from a room where any
fossil fuel appliance (ie., a water heater) is installed.
When return air is drawn from a room, a negative pres-
sure is created in the room. If a fossil fuel appliance is op-
erating in a room with negative pressure, the flue prod-
ucts can be pulled back down the vent pipe and into the
room. This reverse flow of the flue gas may result in in-
complete combustion and the formation of carbon mon-
oxide gas. This toxic gas might then be distributed
throughout the house by the air handler duct system.