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Step 5 — Make Duct Connections
If applicable, install all ductwork to and from unit in accordance
with all applicable codes. Duct construction must allow unit to
operate within duct external static pressure limits as shown on
job submittals and in Tables 5 and 6. Duct opening should be the
same size as the unit. For 40UH units ducted to multiple open-
ings, allow adequate straight duct, as shown below, immediately
after the unit.
.
Units provided with outside air must utilize the low-temperature
safety switch to prevent coil freeze-up.
Insulate all ductwork as required. Use flexible connections to
minimize duct-to-unit alignment problems and noise transmis-
sion where specified.
Install ductwork, grilles, and plenums so that they do not restrict
access to filter.
Cut openings for supply and return air grilles, thermostats,
and switch plates where specified on job drawings. Be careful
not to cut wires, piping, or structural supports. Use a steel
thermostat shield ring to protect drywall from thermostat wir-
ing where applicable.
Prevent dust and debris from settling in unit. If wall finish or col-
or is to be applied by spraying, cover all openings to prevent
spray from entering unit.
Table 5 — Unit Ventilator Airflow — PSC Motor*
LEGEND
*Standard on sizes 050-150.
†DX cooling applications are only available in 4-row cooling configuration.
NOTE: Use the table below to determine the heating and cooling coil com-
binations available with PSC motor operation.
40UH
075
100
125
150
200
Minimum Straight Duct
Required (Length in inches)
45
52
58
63
75
CAUTION
Units designed to operate with ductwork may be damaged
if operated without intended ductwork attached.
Ensure that units ducted to multiple openings have sufficient
straight duct immediately after the unit.
FACTORY SETTINGS — CHILLED WATER COIL APPLICATIONS
Unit
Speed
Approximate Air Delivery (Cfm)
1-row
2-row
3-row
4-row
5-row
6-row
7-row
40UV050
Max
522
510
497
485
490
489
457
High
503
490
476
464
473
476
444
Low
458
449
440
425
452
455
430
40UV,UH075
Max
806
778
750
747
766
732
697
High
682
664
645
629
621
596
570
Low
569
554
539
527
533
514
495
40UV,UH100
Max
1064
1033
1001
1013
973
980
967
High
662
659
655
642
763
740
717
Low
530
519
507
503
498
501
504
40UV,UH125
Max
1295
1285
1215
1218
1239
1250
1175
High
899
930
876
865
852
846
846
Low
568
616
597
570
568
558
573
40UV,UH150
Max
1542
1480
1500
1484
1468
1482
1374
High
1071
1068
1065
1034
1033
1031
1013
Low
812
801
790
881
848
842
799
FACTORY SETTINGS — ELECTRIC HEAT/DX COIL APPLICATIONS
Unit
Speed
Approximate Air Delivery (cfm)
1-row
2-row
3-row
4-row
5-row
6-row
7-row
40UV050
Max
522
510
497
485
490
489
457
High
503
490
476
464
452
455
430
Low
458
449
440
425
410
414
406
40UV,UH075
Max
806
778
750
747
766
732
697
High
682
664
645
629
621
596
570
Low
569
554
539
527
533
514
495
40UV,UH100
Max
1064
1033
1001
1013
973
980
967
High
794
788
782
773
857
834
810
Low
662
659
655
642
628
620
611
40UV,UH125
Max
1295
1285
1215
1218
1239
1250
1175
High
1055
1040
1024
995
1099
1091
1052
Low
738
767
732
719
987
986
964
40UV,UH150
Max
1542
1480
1500
1484
1468
1482
1374
High
1285
1257
1229
1248
1246
1239
1199
Low
934
928
922
901
1033
1031
1013
CW
—
Chilled Water Applications
DX
—
Direct Expansion
HW
—
Hot Water
PSC —
Permanent Split Capacitor
COOLING COIL
HEATING COIL
HW
Steam
Electric
5 Rows CW
1 or 2 rows
N/A
3 elements
4 Rows CW or DX†
3 rows
1 or 2 rows
4 elements
3 Rows CW
4 rows
1 or 2 rows
5 or 6 elements