19
Table 4 -- Air Delivery -- CFM (With Filter)* (CONTINUED)
COOLING
4
AND HEATING AIR DELIVERY - CFM (Bottom Return
5
With Filter)
(SW1-5 and SW2-2 set to OFF, except as indicated. See notes 1 and 2.)
Unit Size: 135V24-22 Clg/CF Switch settings External Static Pressure (ESP)
Clg Switches: SW2-8 SW2-7 SW2-6 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 2105 2050 1995 1940 1880 1820 1765 1705 1650 1590
Cooling
(SW2-8,7,6)
OFF OFF ON 990 885 780 665 570 See note 4
OFF ON OFF 1180 1090 995 900 815 715 635 555 475 400
OFF ON ON 1355 1270 1190 1105 1020 940 855 775 700 630
ON OFF OFF 1535 1465 1395 1320 1245 1165 1095 1025 945 875
ON OFF ON 1735 1670 1605 1535 1470 1405 1335 1270 1205 1140
ON ON OFF 2105 2050 1995 1940 1880 1820 1765 1705 1650 1590
ON ON ON 2280 2225 2175 2120 2065 2010 1955 1905 1850 1800
Maximum Clg Airflow
2
2360 2310 2265 2215 2160 2115 2060 2010 1960 1870
CF Switches SW2-5 SW2-4 SW2-3
Low-Clg Default: OFF OFF OFF 990 885 780 665 570 See note 4
Low-Cooling
(SW2-5,4,3)
OFF OFF ON 800 670 540 410 280 See note 4
OFF ON OFF 990 885 780 665 570 See note 4
OFF ON ON 1180 1090 995 900 815 715 635 555 475 400
ON OFF OFF 1355 1270 1190 1105 1020 940 855 775 700 630
ON OFF ON 1535 1465 1395 1320 1245 1165 1095 1025 945 875
ON ON OFF 1735 1670 1605 1535 1470 1405 1335 1270 1205 1140
ON ON ON 2105 2050 1995 1940 1880 1820 1765 1705 1650 1590
Cont. Fan Default: OFF OFF OFF 740 605 470 360 255 See note 4
Continuous Fan
(SW2-5,4,3)
OFF OFF ON 740 605 470 360 255 See note 4
OFF ON OFF 900 775 650 525 400 See note 4
OFF ON ON 1080 980 885 785 680 595 510 430 345 260
ON OFF OFF 1080 980 885 785 680 595 510 430 345 260
ON OFF ON 1080 980 885 785 680 595 510 430 345 260
ON ON OFF 1080 980 885 785 680 595 510 430 345 260
ON ON ON 1080 980 885 785 680 595 510 430 345 260
Heating
(SW1)
High Heat Airflow
3
2130 2075 2020 1970 1910 1855 1805 1745 1690 1630
Low Heat Airflow
3
1855 1795 1730 1670 1605 1545 1480 1420 1360 1300
1. Nominal 350 CFM/ton cooling airflow is delivered with SW1-5 and SW2-2 set to OFF.
Set both SW1-5 and SW2-2 to ON for +7% airflow (nominal 370 CFM/ton).
Set SW1-5 to ON and SW2-2 to OFF for +15% airflow (nominal 400 CFM/ton).
Set SW2-2 to ON and SW1-5 to OFF for -7% airflow (nominal 325 CFM/ton).
The above adjustments in airflow are subject to motor horsepower range/capacity.
This applies to Cooling and Low-Cooling airflow, but does not affect continuous fan airflow.
2. Maximum cooling airflow is achieved when switches SW2-6, SW2-7, SW2-8 and SW1-5 are set to ON, and SW2-2 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 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. Side returns for 24.5" casing sizes require two sides, or side and bottom, to allow sufficient airflow at the return of the furnace.
7. Airflows over 1800 CFM require bottom return, two-side return, or bottom and side return or excessive watt draw may result. A minimum
filter size of 20x25" (508 x 635 mm) is required.
Return Air Connections
FIRE HAZARD
A failure to follow this warning could cause personal injury,
death and/or property damage.
Never connect return--air ducts to the back of the furnace.
Follow instructions below.
!
WARNING
Downflow Furnaces
The return -- air duct must be connected to return--air opening
(bottom inlet). DO NOT cut into casing sides (left or right). Side
opening is permitted for only upflow and certain horizontal
furnaces. Bypass humidifier connections should be made at
ductwork or coil casing sides exterior to furnace. (See Fig. 19.)
Upflow and Horizontal
Furnaces
The return-- air duct must be connected to bottom, sides (left or
right), or a combination of bottom and side(s) of main furnace
casing. Bypass humidifier may be attached into unused return air
side of the furnace casing. (See Fig. 18 and 20.) Not all upflow
and horizontal furnace models are approved for side return air
connections. (See Fig. 18 and 20.)
GAS
PIPING
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death, and/or property damage.
Never purge a gas line into a combustion chamber. Never
test for gas leaks with an open flame. Use a commercially
available soap solution made specifically for the detection
of leaks to check all connections. A fire or explosion may
result causing property damage, personal injury or loss of
life.
!
WARNING
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