Sealing The Unit; Air Volume Adjustment - Lennox CBX32M Elite Series Installation Instructions Manual

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
External Static
Pressure
in. w.g. Pa
.00 0
.05 10
.10 25
.15 35
.20 50
.25 60
.30 75
.40 100
.50 125
.60 150
.70 175
.75 185
NOTE − All air data is measured external to unit with air filter in place. Electric heaters have no appreciable air resistance.
506150−01 05/09
Table 4. CBX32M-018/024 Air Handler Performance (208/230V)
Air Volume and Motor Watts at Specific Blower Taps
Low
cfm L/s Watts
700 330 245
695 330 245
690 325 240
680 320 235
665 315 230
650 310 220
635 300 215
590 280 205
535 255 190
470 220 175
395 185 165
350 165 155
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.
PRESS THE TAB TO RELEASE WIRE CONNECTOR.
SELECT CONNECTOR LOCATION FOR NEW SPEED.
INSERT WIRE UNTIL IT CLICKS.
Figure 17. Blower Speed Tap Selection
Medium
cfm L/s Watts
895 425
890 420
875 415
860 405
845 400
825 390
800 380
745 355
685 320
605 285
520 245
475 225
Page 14
CONNECTOR
High
cfm L/s
300 1030 485
295 1015 480
290 1000 470
285 980 465
280 960 455
275 935 440
265 910 430
250 850 400
235 780 370
220 705 330
200 615 290
195 565 265
HARNESS
Watts
365
360
355
345
340
335
325
310
295
280
265
255