12
AIR DELIVERY -- CFM (BOTT OM RETURN WITH FILTER)* CONTINUED
UNIT SIZE
OPERATING
MODE
CFM
AIRFLOW
SETTING
EXTERNAL
STATIC
PRESSURE
RANGE*
EXTERNAL STATIC PRESSURE (ESP)
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
100--- 20# Low Heat 1110† 0 --- 1 . 0 1060 1075 1080 1095 1110 1110 1110 1110 1110 1110
High Heat 1525 0 --- 1 . 0 1525 1525 1525 1525 1520 1515 1515 1515 1515 1515
††
2 --- To n A / C
Cooling
700 0---0.50‡ 700 700 700 690 685
††
2 --- 1 / 2 --- To n A / C
Cooling
875 0---0.50‡ 865 875 870 870 875
3 --- To n A / C
Cooling
1050 0 ---1.0‡ 1035 1045 1050 1045 1050 1050 1050 1050 1050 1045
3 --- 1 / 2 --- To n A / C
Cooling
1225 0 ---1.0‡ 1180 1195 1215 1225 1225 1225 1225 1225 1225 1225
4 --- To n A / C
Cooling
1400 0 ---1.0‡ 1400 1400 1400 1400 1400 1400 1400 1395 1375 1365
5 --- To n A / C
Cooling
1750 0 --- 1 . 0 1740 1745 1750 1750 1750 1750 1750 1750 1750 1740
Maximum 2000 0 --- 1 . 0 2000 2000 2000 2000 2000 2000 1985 1965 1940 1910
120--- 20 Low Heat 1380† 0 --- 1 . 0 1345 1365 1380 1380 1380 1380 1380 1375 1360 1355
High Heat 1885 0 --- 1 . 0 1875 1880 1885 1885 1885 1885 1885 1885 1880 1870
††
2 --- To n A / C
Cooling
700 0---0.50‡ 700 700 700 700 695
††
2 --- 1 / 2 --- To n A / C
Cooling
875 0---0.50‡ 875 875 875 870 870
3 --- To n A / C
Cooling
1050 0 ---1.0‡ 1035 1040 1050 1050 1050 1050 1050 1025 1005 1000
3 --- 1 / 2 --- To n A / C
Cooling
1225 0 ---1.0‡ 1205 1210 1225 1225 1225 1225 1225 1225 1220 1215
4 --- To n A / C
Cooling
1400 0 ---1.0‡ 1390 1400 1400 1400 1400 1400 1395 1385 1370 1360
5 --- To n A / C
Cooling
1750 0 ---1.0‡ 1745 1740 1745 1745 1745 1745 1745 1740 1730 1715
6 --- To n A / C
Cooling
2100 0 --- 1 . 0 2100 2100 2100 2100 2100 2095 2075 2040 1975 1910
Maximum 2100 0 --- 1 . 0 2100 2100 2100 2100 2100 2095 2075 2040 1975 1910
* Actual external static pressure (ESP) can be determined by using the fan laws (CFM
2
proportional to ESP); such as, a system with 1750 CFM at 0.5 ESP
would opera te at high---heating a irfl ow of 1500 CFM at 0.37 ESP a nd low ---heating airfl ow of 705 CFM at 0.08 ESP.
{ Low heat CFM when low---heat rise adjustment switch (SW1 ---3) and comfort/efficiency adjustment switch (SW1 ---4) on control center are OFF.
} Ductwork must be sized for high ---heating CFM within the operational range of ESP.
{{ Operation within the blank areas of the chart is not recommended because high---heat operation will be above 1.0 ESP.
# All airflows for 21 in. casing size furnaces are 5% less on side return only installations.
58UVB
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