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.
MINIMUM BLOWER SPEEDS (WITH ELECTRIC
HEATERS)
AIR VOLUME ADJUSTMENT
Select the Blower speed by changing the taps at the
harness connector at the blower motor as illustrated in
figure 4. For selecting the blower speed and see figure 9 on
page 11 for the unit wiring diagram. Refer to the tables 6
through 10 for blower performance data.
Press the tab to release
wire connector, select
connector location for
For the minimum allowable speed for the CB30U series new speed.Insert wire
units with electric heat, refer to the ECB29/ECB31 untilit clicks.
installation instructions.
Table 6. CB30U-21/26 Air Handler Performance (208/230v)
External Static Air Volume and Motor Watts at Specific Blower
Pressure
Pa
o
lO
25
35
50
6o
75
lOO
125
15o
175
185
cfm
1035
1020
1005
985
965
940
920
865
8O5
735
655
615
High
L/s
49O
48O
475
465
455
445
435
410
380
345
310
29O
Watts
390
385
380
375
370
365
360
345
330
320
3o5
295
cfm
85O
840
830
820
8O5
790
770
725
670
610
535
5OO
in. w.g.
.00
.05
.10
.15
,20
.25
.30
.40
.50
.60
.70
.75
Figure 4. Blower Speed Tap Selection
Watts
3o5
3oo
295
29o
285
28o
275
265
25o
24o
225
215
bottom return air or side return
Medium
L/s
4OO
395
395
385
380
37O
365
340
315
285
255
235
with
HARNESS
CONNECTOR
NOTE - All air data is measured external to the unit with air filter in place
open). Electric heaters have no appreciable air resistance.
Taps
Low
cfm L/s Watts
670 315 230
665 315 230
660 310 225
650 305 225
640 300 220
625 295 220
610 290 215
575 270 210
535 250 200
485 230 190
430 200 180
395 190 175
a_ (with both sides
Table 7. CB30U-31 Air Handler Performance (208/230v)
External Static Air Volume and Motor Watts at Specific Blower
High
L/s
59O
59O
58O
57O
55O
53O
5O5
435
350
245
120
5O
Watts
35o
35o
345
340
330
320
315
295
28o
26o
240
23o
Medium
cfm L/s
1190 560
1190 560
1175 555
1155 545
1120 530
1080 510
1030 485
895 425
725 340
510 240
260 120
115 55
Watts
315
315
31o
300
290
285
275
255
240
220
2o0
19o
Taps
Low
cfm L/s Watts
1045 495 265
1050 495 265
1040 490 255
1025 485 250
1005 475 245
970 460 235
930 440 225
820 385 205
670 315 185
490 230 165
275 130 145
150 70 135
Pa
o
lO
25
35
5o
6o
75
lOO
125
15o
175
185
cfm
1255
1245
1230
1205
1170
1125
1065
925
740
520
255
110
in. w.g.
.00
.05
.10
.15
.20
.25
.30
.40
.50
.60
.70
.75
Pressure
NOTE - For side return air applications (with both sides open) add:. 10 in. wc. (25 Pa) static capacity to unit performance. Electric heaters
have no appreciable air resistance. Aft air data is measured external to the unit with the air filter in place with bottom return air.
Page 6
505340M 07/07
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