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BLOWER DATA
SL280UH135V60D BLOWER PERFORMANCE (less lter)
BOTTOM RETURN AIR, RETURN AIR FROM BOTH SIDES OR RETURN AIR FROM BOTTOM AND ONE SIDE
0 through 0.8 in. w.g. (Heating) and 0 through 1.0 in. w.g. (Cooling) External Static Pressure Range
HEATING
1
Heating Speed
DIP Switch
Settings
First Stage Heating Speed - cfm Second Stage Heating Speed - cfm
+24% 1875 2065
+18% 1785 1965
+12% 1695 1865
+6% 1605 1765
Factory Default 1515 1665
–6% 1425 1565
–12% 1330 1465
–18% 1240 1365
COOLING
1
Cooling Speed
DIP Switch
Settings
First Stage Cooling Speed - cfm Second Stage Cooling Speed - cfm
Low Medium-Low Medium-High
2
High Low Medium-Low Medium-High
2
High
+ 1025 1120 1325 1650 1500 1600 1840 2235
Factory Default 965 1015 1180 1490 1420 1510 1700 2110
– 875 930 1060 1350 1225 1320 1505 1840
SINGLE SIDE RETURN AIR
0 through 0.8 in. w.g. (Heating) and 0 through 1.0 in. w.g. (Cooling) External Static Pressure Range
HEATING
1
Heating Speed
DIP Switch
Settings
First Stage Heating Speed - cfm Second Stage Heating Speed - cfm
+24% 1850 2035
+18% 1760 1935
+12% 1670 1835
+6% 1580 1740
Factory Default 1490 1640
–6% 1400 1540
–12% 1310 1445
–18% 1225 1345
COOLING
1
Cooling Speed
DIP Switch
Settings
First Stage Cooling Speed - cfm Second Stage Cooling Speed - cfm
Low Medium-Low Medium-High
2
High Low Medium-Low Medium-High
2
High
+ 1030 1105 1305 1635 1525 1600 1840 2255
Factory Default 960 1005 1175 1480 1355 1435 1635 2035
– 845 925 1050 1340 1240 1315 1520 1850
1
Cooling and heating speeds are based on a combination of DIP switch settings on the furnace control. Refer to Installation Instructions for specic DIP Switch
Settings.
2
Factory default setting.
NOTES - The effect of static pressure is included in air volumes shown.
First stage HEAT is approximately 91% of the same second stage HEAT.
First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position.
Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 500 cfm.
Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 426 cfm.