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31
Air Delivery -- CFM continued (with Filter)*
(SW1---5 and SW4---3 set to OFF, except as indicated. See notes 1 and 2)
Size:
080C21---20
Clg/CF Switch settings
External Static Pressure (ESP)
Clg Switches
SW2---3
SW2---2
SW2---1
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Clg Default:
OFF
OFF
OFF
1905 1920 1935 1945 1950 1945 1935 1930 1920 1905
CF Switches
SW3---3
SW3---2
SW3---1
Low---Clg Default:
OFF
OFF
OFF
1905 1920 1935 1945 1950 1945 1935 1930 1920 1905
Cooling Airflow
(SW2)
Low---Cooling
Airflow (SW3)
OFF
OFF
ON
785
765
775
See Note 4
OFF
ON
OFF
930
975
990
985
990
1000
985
See Note 4
OFF
ON
ON
1130 1155 1150 1175 1190 1195 1215 1215 1215 1215
ON
OFF
OFF
1345 1345 1350 1370 1370 1365 1365 1355 1345 1335
ON
OFF
ON
1550 1560 1580 1575 1580 1565 1555 1540 1535 1525
ON
ON
OFF
1905 1920 1935 1945 1950 1945 1935 1930 1920 1905
ON
ON
ON
2300 2315 2320 2325 2315 2305 2280 2240 2245 2215
Maximum Clg Airflow
2
2405 2410 2415 2400 2390 2360 2305 2275 2255 2215
CF Switches
SW3---3
SW3---2
SW3---1
Cont. Fan Default:
OFF
OFF
OFF
785
765
775
See Note 4
Continuous Fan
Airflow
(SW3)
OFF
OFF
ON
785
765
775
See Note 4
OFF
ON
OFF
930
975
990
985
990
1000
985
See Note 4
OFF
ON
ON
1130 1155 1150 1175 1190 1195 1215 1215 1215 1215
ON
OFF
OFF
1130 1155 1150 1175 1190 1195 1215 1215 1215 1215
ON
OFF
ON
1130 1155 1150 1175 1190 1195 1215 1215 1215 1215
ON
ON
OFF
1130 1155 1150 1175 1190 1195 1215 1215 1215 1215
ON
ON
ON
1130 1155 1150 1175 1190 1195 1215 1215 1215 1215
Heating (SW1)
Heating Airflow
3
1550 1570 1585 1580 1565 1555 1550 1545 1545 1535
Size:
100C21---20
Clg/CF Switch settings
External Static Pressure (ESP)
Clg Switches
SW2---3
SW2---2
SW2---1
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Clg Default:
OFF
OFF
OFF
1785 1800 1805 1830 1830 1845 1855 1860 1850 1840
CF Switches
SW3---3
SW3---2
SW3---1
Low---Clg Default:
OFF
OFF
OFF
1785 1800 1805 1830 1830 1845 1855 1860 1850 1840
Cooling Airflow
(SW2)
Low---Cooling
Airflow (SW3)
OFF
OFF
ON
635
630
See Note 4
OFF
ON
OFF
785
820
865
See Note 4
OFF
ON
ON
1040 1045 1070 1085 1130
See Note 4
ON
OFF
OFF
1205 1220 1245 1280 1290 1295 1290 1280
See Note 4
ON
OFF
ON
1380 1425 1445 1465 1480 1475 1490 1485 1455 1460
ON
ON
OFF
1785 1800 1805 1830 1830 1845 1855 1860 1850 1840
ON
ON
ON
2170 2155 2175 2195 2185 2195 2190 2180 2160 2100
Maximum Clg Airflow
2
2200 2220 2245 2260 2260 2260 2255 2225 2170 2100
CF Switches
SW3---3
SW3---2
SW3---1
Cont. Fan Default:
OFF
OFF
OFF
635
630
See Note 4
Continuous Fan
Airflow
(SW3)
OFF
OFF
ON
635
630
See Note 4
OFF
ON
OFF
785
820
865
See Note 4
OFF
ON
ON
1040 1045 1070 1085 1130
See Note 4
ON
OFF
OFF
1205 1220 1245 1280 1290 1295 1290 1280
See Note 4
ON
OFF
ON
1380 1425 1445 1465 1480 1475 1490 1485 1455 1460
ON
ON
OFF
1380 1425 1445 1465 1480 1475 1490 1485 1455 1460
ON
ON
ON
1380 1425 1445 1465 1480 1475 1490 1485 1455 1460
Heating (SW1)
Heating Airflow
3
1785 1800 1765 1785 1800 1820 1830 1835 1825 1810
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 on ON for nominal 370 CFM/ton (+7% airflow).
This applies to Cooling and Low-Cooling airflow, but does not affect continuous fan 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 comfort/efficiency adjustment switch (SW1-4) is set to OFF
4. Ductwork must be sized for heating CFM within the operational range of ESP. Operation within the blank areas of the chart is not
recommended because heat operation will be above 1.0 ESP.
5. All airflows on 21" casing size furnaces are 5% less on side return only installations.