32
Table 9 -- Cooling
4
and Heating Air Delivery -- CFM (Bottom Return
5
With Filter) (Continued)
Unit Size
Clg/CF Switch Settings External Static Pressure (ESP)
SWx-3 SWx-2 SWx-1 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
100-22
Clg Default: OFF OFF OFF 1820 1825 1840 1845 1840 1835 1825 1805 1780 1770
CF Default: OFF OFF OFF 750 740 745 730 715 Seenote4
Cooling (SW2)
Cont Fan (SW3)
OFF OFF ON 750 740 745 730 715 Seenote4
OFF ON OFF 900 900 915 910 905 Seenote4
OFF ON ON 1070 1075 1095 1095 1090 1085 1095 1080 1065 1070
ON OFF OFF 1280 1285 1305 1305 1310 1305 1295 1300 1290 1285
ON OFF ON 1440 1445 1465 1465 1470 1485 1480 1485 1475 1460
ON ON OFF 1820 1825 1840 1845 1840 1835 1825 1805 1780 1770
ON ON ON 2135 2140 2140 2135 2140 2130 2115 2100 2070 2015
Clg SW2: Maximum Clg Airflow
2
2160 2165 2175 2170 2160 2150 2135 2120 2065 2020
Heating
(SW1)
Maximum Heat Airflow
3
1570 1575 1595 1595 1600 1605 1600 1600 1590 1575
Intermediate Heat Airflow
3
950 955 965 975 970 Seenote4
Minimum Heat Airflow
3
755 745 750 735 720 Seenote4
Unit Size
Clg/CF Switch Settings External Static Pressure (ESP)
SWx-3 SWx-2 SWx-1 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
120-22
Clg Default: OFF OFF OFF 1850 1855 1860 1855 1850 1830 1805 1775 1750 1730
CF Default: OFF OFF OFF 930 925 915 900 885 Seenote4
Cooling (SW2)
Cont Fan (SW3)
OFF OFF ON 765 745 740 705 680 Seenote4
OFF ON OFF 930 925 915 900 885 Seenote4
OFF ON ON 1095 1100 1110 1105 1085 Seenote4
ON OFF OFF 1265 1255 1265 1280 1275 1285 1270 1260 1250 1230
ON OFF ON 1465 1455 1470 1465 1465 1470 1455 1450 1435 1415
ON ON OFF 1850 1855 1860 1855 1850 1830 1805 1775 1750 1730
ON ON ON 2200 2200 2200 2190 2185 2170 2145 2085 1990 1890
Clg SW2: Maximum Clg Airflow
2
2200 2200 2200 2190 2185 2170 2145 2085 1990 1890
Heating
(SW1)
Maximum Heat Airflow
3
1815 1820 1825 1820 1815 1795 1775 1745 1720 1700
Intermediate Heat Airflow
3
1095 1100 1110 1105 1085 Seenote4
Minimum Heat Airflow
3
905 900 890 875 855 Seenote4
1. Nominal 350 CFM/ton cooling airflow is delivered with SW1--5 and SW4--3 set to OFF.
Set SW1--5 to ON for nominal 400 CFM/ton (+15% airflow).
Set SW4--3 to ON for nominal 325 CFM/ton (--7% airflow).
Set both SW1--5 and SW4--3 to ON for nominal 370 CFM/ton (+7% airflow).
The above adjustments in airflow are subject to motor horsepower range/capacity.
2. Maximum cooling airflow is achieved when switches SW2--1, SW2--2, SW2--3 and SW1--5 are set to ON, and SW4--3 is set to OFF.
3. All heating CFM’s are when low/medium heat rise adjustment switch (SW1--3) and comfort/efficiency adjustment switch (SW1--4) are both
set to OFF.
4. 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.
5. All airflows on 21” casing size furnaces are 5% less on side return only installations.
6. Return air above 1800 CFM on 24.5” casing sizes requires two sides, one side and bottom or bottom only , to allow sufficient airflow to the furnace.
59MN7A
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