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Sealing the Unit
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 Blower Speed
MINIMUM BLOWER SPEEDS (WITH ELECTRIC
HEATERS)
For the minimum allowable speed for the CB30U series
units with electric heat, refer to the ECB29/ECB31
installation instructions.
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 the unit with air filter in place with bottom return air or side return air (with both sides
open). Electric heaters have no appreciable air resistance.
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 − For side return air applications (with both sides open) add: .10 in. w.c. (25 Pa) static capacity to unit performance. Electric heaters
have no appreciable air resistance. All air data is measured external to the unit with the air filter in place with bottom return air.
505340M 07/07
Table 6. CB30U-21/26 Air Handler Performance (208/230v)
Air Volume and Motor Watts at Specific Blower Taps
High
cfm
L/s
Watts
1035
490
1020
480
1005
475
985
465
965
455
940
445
920
435
865
410
805
380
735
345
655
310
615
290
Table 7. CB30U-31 Air Handler Performance (208/230v)
Air Volume and Motor Watts at Specific Blower Taps
High
cfm
L/s
Watts
1255
590
1245
590
1230
580
1205
570
1170
550
1125
530
1065
505
925
435
740
350
520
245
255
120
110
50
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
new speed. Insert wire
until it clicks.
Figure 4. Blower Speed Tap Selection
Medium
cfm
L/s
390
850
400
385
840
395
380
830
395
375
820
385
370
805
380
365
790
370
360
770
365
345
725
340
330
670
315
320
610
285
305
535
255
295
500
235
Medium
cfm
L/s
350
1190
560
350
1190
560
345
1175
555
340
1155
545
330
1120
530
320
1080
510
315
1030
485
295
895
425
280
725
340
260
510
240
240
260
120
230
115
55
Page 6
Low
Watts
cfm
L/s
305
670
315
300
665
315
295
660
310
290
650
305
285
640
300
280
625
295
275
610
290
265
575
270
250
535
250
240
485
230
225
430
200
215
395
190
Low
Watts
cfm
L/s
315
1045
495
315
1050
495
310
1040
490
300
1025
485
290
1005
475
285
970
460
275
930
440
255
820
385
240
670
315
220
490
230
200
275
130
190
150
70
HARNESS
CONNECTOR
Watts
230
230
225
225
220
220
215
210
200
190
180
175
Watts
265
265
255
250
245
235
225
205
185
165
145
135
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