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BLOWER DATA
SL280UH090V36B BLOWER PERFORMANCE (less filter)
BOTTOM 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%
1300
1420
+18%
1250
1335
+12%
1185
1285
+6%
1145
1240
Factory Default
1070
1170
–6%
1015
1100
–12%
970
1035
–18%
880
980
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
+
616
755
846
980
1018
1197
1291
1399
Factory Default
571
698
767
886
909
1083
1197
1284
–
489
627
681
812
834
968
1081
1179
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%
1305
1425
+18%
1250
1350
+12%
1195
1290
+6%
1135
1230
Factory Default
1070
1165
–6%
995
1100
–12%
935
1030
–18%
870
960
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
+
611
731
830
971
995
1160
1274
1376
Factory Default
575
674
748
870
889
1075
1160
1270
–
519
604
691
786
808
952
1056
1147
1
Cooling and heating speeds are based on a combination of DIP switch settings on the furnace control. Refer to Installation Instructions for specific 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 455 cfm.
