Lennox International Inc 1045, 985, 940, 880, 850, 785, 745, 680, 1372, 695, 1260, 1144

BLOWER DATA

SL280UH070V36A 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		First Stage Heating Speed - cfm				Second Stage Heating Speed - cfm
Settings
+24%		1045				1145
+18%		985				1080
+12%		940				1035
+6%		880				960
Factory Default		850				925
–6%		785				875
–12%		745				815
–18%		680				745
			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
+	781	819	872	981	1045		1139	1219	1372
Factory Default	695	734	797	883	943		1005	1114	1260
–	645	674	720	815	847		922	991	1144

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%		1050				1165
+18%		1000				1110
+12%		940				1040
+6%		895				975
Factory Default		820				935
–6%		775				855
–12%		735				805
–18%		685				750
			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
+	764	802	886	977	1035		1122	1248	1360
Factory Default	704	725	793	899	949		1029	1135	1257
–	642	680	717	812	874		933	1021	1133

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 425 cfm.

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