Lennox International Inc. DAVE LENNOX SIGNATURE COLLECTION GAS FURNACE UPFLOW / HORIZONTAL AIR DISCHARGE Furnace User Manual


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BLOWER DATA
SL280UH090V48B BLOWER PERFORMANCE (less lter)
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% 1280 1410
+18% 1220 1340
+12% 1155 1270
+6% 1095 1205
Factory Default 1035 1135
–6% 970 1070
–12% 910 1000
–18% 845 930
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
+ 670 890 1040 1210 1030 1335 1550 1755
Factory Default 605 815 965 1090 940 1205 1405 1,600
– 525 690 850 985 795 1060 1260 1435
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% 1280 1410
+18% 1220 1340
+12% 1155 1270
+6% 1095 1205
Factory Default 1035 1135
–6% 970 1070
–12% 910 1000
–18% 845 930
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
+ 640 900 1015 1175 1005 1295 1500 1670
Factory Default 570 780 930 1040 895 1160 1345 1500
– 530 700 810 955 795 1050 1210 1405
1
Cooling and heating speeds are based on a combination of DIP switch settings on the furnace control. Refer to Installation Instructions for specic 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.
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