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BLOWER DATA
SL280UH135V60D BLOWER PERFORMANCE (less lter)
SIDE RETURN AIR WITH OPTIONAL RETURN AIR BASE
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% 1840 2025
+18% 1750 1925
+12% 1660 1830
+6% 1575 1730
Factory Default 1485 1630
–6% 1395 1535
–12% 1305 1435
–18% 1215 1340
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
+ 1035 1105 1285 1610 1530 1610 1825 2240
Factory Default 955 1005 1145 1430 1365 1450 1650 2040
– 860 935 1050 1295 1225 1310 1515 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 495 cfm.