Table 8—Gas Heat Airflow—Nominal CFM at up to 0.70-in. w.c. ESP (With Filter)
FURNACE SIZE
GAS HEAT TEMP RISE* GAS HEAT TEMP RISE (°F)† GAS HEAT AIRFLOW (CFM)
Jumper Position
High-Stage Low-Stage High-Stage Low-Stage
Red Wire Violet Wire
060
HI A 51 45 925 615
M-HI A 46 38 1085 730
MID D 40 30 1250 1135
080
HI A 58 44 970 790
M-HI A 51 39 1140 925
MID D 45 29 1310 1395
100**
HI A 51 44 1430 1035
M-HI A 45 39 1685 1215
MID D 40 30 1935 1630
120**
HI A 69 49 1330 1240
M-HI A 59 43 1560 1460
MID D 55 40 1720 1605
*Use listed jumper position combinations only.
†Within ± 2°F
→ ** Air delivery may be reduced by as much as 3% when using a single side return.
Table 9—Cooling and Heat Pump Efficiency Heating Airflow Nominal CFM
at up to 0.70-in. w.c. ESP† (With Filter)
AC/HP JUMPER POSITION:
AC
HP—EFFY
HP—CFMT
AIR CONDITIONING, COOLING AIRFLOW
HEAT PUMP—EFFICIENCY, COOLING AND HEATING AIRFLOW
HEAT PUMP—COMFORT, COOLING AIRFLOW
Furnace
Size
Airflow
Selection
Single-Speed
CFM
Two-Speed (High/Low)
CFM
Cool Size
Jumper
Position
Tons
Cool CFM Per Ton
Jumper Position
Cool CFM Per Ton Jumper Position
400 350 315
400 350 315 High Low High Low High Low
060
LO 1-1/2 600 530 500* 630 500* 550 500* 500* 500*
M-LO 2 800 700 630 865 510 735 500* 660 500*
M-HI 2-1/2 1000 880 790 1060 650 920 570 825 510
HI 3 1200 1050 945 1260 780 1100 680 990 585
080
LO 2-1/2 1000 875 790 1050 660 920 595 830 545
M-LO 3 1215 1050 945 1260 790 1100 700 990 625
M-HI 3-1/2 1400 1225 1100 1470 910 1280 805 1155 715
HI 4 1600† 1400 1350 1635† 1040 1470 915 1325 820
100**
LO 3 1195 1045 950 1260 780 1090 775 990 700*
M-LO 3-1/2 1400 1225 1090 1470 910 1285 830 1155 715
M-HI 4 1600 1400 1260 1680 1040 1465 915 1325 820
HI 5 2000 1750 1575 2085 1300 1840 1150 1655 1025
120**
LO 3 1160 1050 955 1195 865 1085 785 985 785
M-LO 3-1/2 1400 1220 1090 1420 970 1265 875 1150 845
M-HI 4 1600 1395 1250 1650 1070 1465 975 1315 930
HI 5 2000 1750 1565 2110 1300 1865 1140 1640 1080
* Minimum airflow is set for use with electronic air cleaner: 060—500 CFM, 080—500 CFM, 100—700 CFM, 120—700 CFM
→ † Maximum available external static pressure is 0.70-in. w.c. for all furnace model sizes and operating modes, except maximum available external static pressure is
0.50-in. w.c. for HI cool size airflow at 400 CFM per ton selection with the 080 size furnace.
→ ** Air delivery may be reduced by as much as 3% when using a single side return.
NOTES:
1. A humidistat can be added to reduce airflow for better dehumidification when needed. This feature reduces the selected cooling airflow by 20% (280 CFM per ton limit).
2. Continuous-fan settings are 50%, 65%, or 100% of selected cooling airflow.
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