31
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
See note 4
Cooling (SW2)
Cont Fan (SW3)
OFF
OFF
ON
750
740
745
730
715
See note 4
OFF
ON
OFF
900
900
915
910
905
See note 4
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
See note 4
Minimum Heat Airflow
3
755
745
750
735
720
See note 4
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
See note 4
Cooling (SW2)
Cont Fan (SW3)
OFF
OFF
ON
765
745
740
705
680
See note 4
OFF
ON
OFF
930
925
915
900
885
See note 4
OFF
ON
ON
1095
1100
1110
1105
1085
See note 4
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
See note 4
Minimum Heat Airflow
3
905
900
890
875
855
See note 4
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.
59MN
7A