The air distribution system has the greatest effect on airflow. The duct system is totally controlled by the contractor. For this reason, the contractor
should use only industry-recognized procedures.
Heat pump systems require a specified airflow. Each ton of cooling requires between 350 and 450 cubic feet of air per minute (CFM), or 400 CFM
nominally.
Duct design and construction should be carefully done. System performance can be lowered dramatically through bad planning or workmanship.
Air supply diffusers must be selected and located carefully. They must be sized and positioned to deliver air along the perimerter of the space. If
they are too small for their intended airflow, they become noisy. If they are not located properly, they cause drafts. Air grilles must be properly sized
to carry air back to the blower.If they are too small, they also cause noise.
The installers should balance the air distribution system to ensure proper quiet airflow to all rooms in the home. This ensures a comfortable living
space.
Airflow performance data is based on cooling performance with a coil and no filter in place. Select performance table for appropriate unit size
external static applied to unit allows operation within the minimum and maximum limits shown in table below for both cooling and electric heat
operation.
Airflow Performance(Standard CFM)
1. Airflow based upon dry coil at 230V with no electric heat
,
no filter. For 24, 30,and 36 sizes, airflow at 208V is approximately the same as
230V because the mult-tap ECM motor is a constant torque motor. The torque doesn’t drop off at the speeds in which the motor operates.
2. Airflow is equivalent for front or bottom return configurations.
3. SCFM is nearly the same with cooling performance airflow, the gap is in the 1 to 2%.
Section 6. Performance and Electrical Data (WALL-MOUNT AIR HANDLERS ARE SUITABLE
FOR MOBILE HOME APPLICATIONS)
--- Shaded boxes represent airflow outside the required 300-450 cfm/ton.
* When
JMM5A0A24M21SAA
is
used with 1.5ton outdoor unit ,select SCFM between 450 and 675.
NOTES:
0
0.1
0.18
0.2
0.3
0.4
0.5
0.6
0.7
0.8
Tap(5)
913
881
848
848
818
792
763
731
691
650
Tap(4)-Factory
825
787
756
753
717
682
650
617
580
540
Tap(3)
737
700
666
663
630
589
550
511
474
436
Tap(2)
675
632
598
596
555
521
480
440
399
366
Tap(1)
590
548
512
499
455
430
368
338
309
263
Tap(5)
1362
1325
1280
1266
1238
1197
1159
1119
1080
1040
Tap(4)
1282
1242
1195
1176
1151
1111
1071
1028
975
936
Tap(3)
1267
1225
1178
1143
1120
1078
1036
993
942
897
Tap(2)-Factory
1157
1111
1061
1052
1016
971
929
884
842
802
Tap(1)
1077
1028
978
965
932
886
850
804
768
732
Tap(5)
1362
1325
1280
1266
1238
1197
1159
1119
1080
1040
Tap(4)-Factory
1282
1242
1195
1176
1151
1111
1071
1028
975
936
Tap(3)
1267
1225
1178
1143
1120
1078
1036
993
942
897
Tap(2)
1157
1111
1061
1052
1016
971
929
884
842
802
Tap(1)
1077
1028
978
965
932
886
850
804
768
732
36
30
24
Model
BLOW ER
SPEEDS
EXTERNAL STATIC PRESSURE(in.w.c.)
JMM5A
11