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Appendix A
The maximum and minimum values of Supply Airflow Targets in CFM units are as below in CFM as well as in lit/sec units.
UNIT SIZE 36 (3 ton) 48 (4 ton) 60 (5 ton)
Units CFM lit/sec CFM lit/sec CFM lit/sec
Maximum High Speed Target &
Heat Mode Target (480 CFM/ton)
1440 679 1920 906 2400 1132
Minimum High Speed Target
(280 CFM/ton)
840 397 1120 529 1400 661
Minimum Low Speed Target
(220 CFM/ton)
660 312 880 416 1100 520
Minimum Ventilation Target
(150 CFM/ton)
450 213 600 284 750 354
Minimum Heat Mode Target Standard Gas
Heat (S,W)
970 458 970 458 970 458
Minimum Heat Mode Target Medium Gas
Heat (M, Q, U, Y)
1120 529 1120 529 1120 529
Minimum Heat Mode Target
High Gas Heat Minimum (H, T, X, Z)
1310 619 1310 619 1310 619
Minimum Heat Mode Target
Electric Heat
1080 510 1280 605 1600 756
Maximum Outdoor Airflow
(150 cfm/ton)
450 212 600 283 750 353
Note:
1. Maximum Ventilation Target should be less than High Speed Target or Heat Mode Target
2. Maximum Low Speed Target should be less than High Speed Target
3. CFM units to liters/sec units conversion factor: 1 CFM = 0.4719474432 lit/sec
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