Page 14
506150−01 05/09
Sealing the Unit
WARNING
There must be an airtight seal between the bottom
of the air handler and the return air plenum. Use
fiberglass sealing strips, caulking, or equivalent
sealing method between the plenum and the air
handler cabinet to ensure a tight seal. Return air
must not be drawn from a room where this air
handler or any gas−fueled appliance (i.e., water
heater), or carbon monoxide−producing device (i.e.,
wood fireplace) is installed.
Seal the unit so that warm air is not allowed into the
cabinet. Warm air introduces moisture, which results in
water blow−off problems. This is especially important when
the unit is installed in an unconditioned area.
Make sure the liquid line and suction line entry points are
sealed with either the provided flexible elastomeric thermal
insulation, or field provided material (e.g. Armaflex,
Permagum or equivalent). Any of the previously mention
materials may be used to seal around the main and
auxiliary drains, and around open areas of electrical inlets.
Adjusting the Blower Speed Adjustments
MINIMUM BLOWER SPEEDS (WITH ELECTRIC
HEATERS)
For the minimum allowable speed for the CBX32M series
units with electric heat, refer to the ECB29 installation
instructions.
AIR VOLUME ADJUSTMENT
Blower speed selection is accomplished by changing the
taps at the harness connector at the Blower motor as
illustrated in figure 17. Refer to unit wiring diagram in figure
15 on page 12. Refer to tables 4 through 11 for air handler
performance data.
HARNESS
CONNECTOR
PRESS THE TAB TO RELEASE WIRE CONNECTOR.
SELECT CONNECTOR LOCATION FOR NEW SPEED.
INSERT WIRE UNTIL IT CLICKS.
Figure 17. Blower Speed Tap Selection
Table 4. CBX32M-018/024 Air Handler Performance (208/230V)
External Static
Pressure
Air Volume and Motor Watts at Specific Blower Taps
Low Medium High
in. w.g. Pa cfm L/s Watts cfm L/s Watts cfm L/s Watts
.00 0 700 330 245 895 425 300 1030 485 365
.05 10 695 330 245 890 420 295 1015 480 360
.10 25 690 325 240 875 415 290 1000 470 355
.15 35 680 320 235 860 405 285 980 465 345
.20 50 665 315 230 845 400 280 960 455 340
.25 60 650 310 220 825 390 275 935 440 335
.30 75 635 300 215 800 380 265 910 430 325
.40 100 590 280 205 745 355 250 850 400 310
.50 125 535 255 190 685 320 235 780 370 295
.60 150 470 220 175 605 285 220 705 330 280
.70 175 395 185 165 520 245 200 615 290 265
.75 185 350 165 155 475 225 195 565 265 255
NOTE − All air data is measured external to unit with air filter in place. Electric heaters have no appreciable air resistance.
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