Lennox SL280UHNV Series Unit Information page 20

BLOWER DATA
SL280UH100NV60C BLOWER PERFORMANCE (less filter)
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 Speed
1
DIP Switch
Settings
+24%
+18%
+12%
+6%
Factory Default
–6%
–12%
–18%
Cooling Speed
1
DIP Switch
Low
Settings
+ 1200
Factory Default 1075
– 1010
SL280UH100NV60C BLOWER PERFORMANCE (less filter)
Single Side Return Air - Air volumes in bold require Optional Return Air base and field fabricated transition to accommodate 20 x
25 x 1 in. air filter in order to maintain proper air velocity.
0 through 0.8 in. w.g. (Heating) and 0 through 1.0 in. w.g. (Cooling) External Static Pressure Range
Heating Speed
1
DIP Switch
Settings
+24%
+18%
+12%
+6%
Factory Default
–6%
–12%
–18%
Cooling Speed
1
DIP Switch
Low
Settings
+ 1140
Factory Default 1040
– 930
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.
1
Factory default setting.
2
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 450 cfm.
Lennox iHarmony Zoning System Applications - Minimum blower speed is 450 cfm.
®
First Stage Heating Speed - cfm
1745
1670
1580
1500
1425
1310
1260
1190
First Stage Cooling Speed - cfm
Medium-Low Medium-High
1250 1380
1150 1275
1050 1150
First Stage Heating Speed - cfm
1600
1530
1440
1370
1290
1260
1175
1065
First Stage Cooling Speed - cfm
Medium-Low Medium-High
1180 1300
1060 1190
970 1070
HEATING
Second Stage Heating Speed - cfm
COOLING
Second Stage Cooling Speed - cfm
High Low
2
1585 1710
1460 1570
1320 1410
HEATING
Second Stage Heating Speed - cfm
COOLING
Second Stage Cooling Speed - cfm
High Low
2
1480 1615
1365 1460
1240 1325
Page 20
1930
1825
1740
1655
1565
1470
1390
1300
Medium-Low Medium-High
1790 1950
1610 1785
1480 1625
1785
1685
1600
1515
1415
1390
1290
1190
Medium-Low Medium-High
1695 1865
1530 1690
1380 1520
High
2
2270
2065
1880
High
2
2160
1960
1760