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.
