Lennox International Inc SL280UH090V48B, SL280UH070V36A Blower Data, Heating, Cooling

BLOWER DATA

SL280UH135V60D 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

1 Heating Speed
DIP Switch		First Stage Heating Speed - cfm				Second Stage Heating Speed - cfm
Settings
+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		First Stage Cooling Speed - cfm				Second Stage Cooling Speed - cfm
DIP Switch	Low	Medium-Low	Medium-High	2 High	Low		Medium-Low	Medium-High	2 High
Settings
+	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		First Stage Heating Speed - cfm				Second Stage Heating Speed - cfm
Settings
+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		First Stage Cooling Speed - cfm				Second Stage Cooling Speed - cfm
DIP Switch
	Low	Medium-Low	Medium-High	2 High	Low		Medium-Low	Medium-High	2 High
Settings
+	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

1Cooling 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.

2Factory 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.

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