Lennox EL297UH045XV36B Installation and operation manual

Page 1
UNIT INFORMATIONUNIT INFORMATION
Service Literature
©2016 Lennox Industries, Inc.
WARNING
Improper installation, adjustment, alteration,
service or maintenance can cause property damage,
personal injury or loss of life. Installation and service
must be performed by a licensed professional HVAC
installer (or equivalent), service agency or the gas
supplier.
CAUTION
As with any mechanical equipment, contact with
sharp sheet metal edges can result in personal
injury. Take care while handling this equipment and
wear gloves and protective clothing.
EL297UHV(X) series units are 90% e󰀩ciency gas furnac-
es used for upow or horizontal applications only, man-
ufactured with Lennox Duralok heat exchangers formed
of aluminized steel. EL297UHV(X) units are available in
heating capacities of 44,000 to 132,000 Btuh and cooling
applications up to 5 tons. Refer to Product Specications
Manual for proper sizing.
Units are factory equipped for use with natural gas. Kits
are available for conversion to LPG operation. EL297UH-
V(X) model units are equipped with the icomfort® enabled
SureLight ® two-stage variable speed integrated control.
EL297UHV(X) unit meets the California Nitrogen Oxides
(NOx) Standards and California Seasonal E󰀩ciency re-
quirements. All units use a redundant gas valve to assure
safety shut-o󰀨 as required by C.S.A.
All specications in this manual are subject to change.
Procedures outlined in this manual are presented as a
recommendation only and do not supersede or replace lo-
cal or state codes. In the absence of local or state codes,
the guidelines and procedures outlined in this manual (ex-
cept where noted) are recommendations only and do not
constitute code.
TABLE OF CONTENTS
Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2
Blower CFM Data . . . . . . . . . . . . . . . . . . . . . . . . . Page 5
I Unit Components . . . . . . . . . . . . . . . . . . . . . . . Page 26
II Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 57
III Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 79
IV Heating System Service Checks . . . . . . . . . Page 80
V Typical Operating Characteristics . . . . . . . . . Page 83
VI Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . Page 83
VII Wiring and Sequence of Operation . . . . . . Page 86
Program Unit Capacity Size Mode . . . . . . . Page 110
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . Page 111
EL297UHV(X)
100088
Communicating-ENABLED EL297UHV SERIES UNITS

Page 2
SPECIFICATIONS
Gas
Heating
Performance
Model No. EL297UH045XV36B EL297UH070XV36B EL297UH090XV36C
1 AFUE 97% 97% 97%
High
Fire
Input - Btuh 44,000 66,000 88,000
Output - Btuh 43,000 64,000 85,000
Temperature rise range - °F 35 - 65 50 - 80 60 - 90
Gas Manifold Pressure (in. w.g.)
Nat. Gas / LPG/Propane
3.5 / 10.0 3.5 / 10.0 3.5 / 10.0
Low
Fire
Input - Btuh 29,000 43,000 57,000
Output - Btuh 28,000 42,000 56,000
Temperature rise range - °F 20 - 50 25 - 55 30 - 60
Gas Manifold Pressure (in. w.g.)
Nat. Gas / LPG/Propane
1.7 / 4.5 1.7 / 4.5 1.7 / 4.5
High static - in. w.g. Heating 0.8 0.8 0.8
Cooling 1.0 1.0 1.0
Connections
in.
Intake / Exhaust Pipe (PVC) 2 / 2 2 / 2 2 / 2
Gas pipe size IPS 1/2 1/2 1/2
Condensate Drain Trap (PVC pipe) - i.d. 3/4 3/4 3/4
with furnished 90° street elbow 3/4 slip x 3/4 Mipt 3/4 slip x 3/4 Mipt 3/4 slip x 3/4 Mipt
with eld supplied (PVC coupling) - o.d. 3/4 slip x 3/4 MPT 3/4 slip x 3/4 MPT 3/4 slip x 3/4 MPT
Indoor
Blower
Wheel nominal diameter x width - in. 10 x 9 10 x 9 10 x 9
Motor output - hp 1/2 1/2 1/2
Tons of add-on cooling 2 - 3 2 - 3 2 - 3
Air Volume Range - cfm 465 - 1370 490 - 1365 520 - 1360
Electrical Data Voltage 120 volts - 60 hertz - 1 phase
Blower motor full load amps 7.7 7.7 7.7
Maximum overcurrent protection 15 15 15
Shipping Data lbs. - 1 package 130 136 152
NOTE - Filters and provisions for mounting are not furnished and must be eld provided.
1 Annual Fuel Utilization E󰀩ciency based on DOE test procedures and according to FTC labeling regulations. Isolated combustion system rating for non-weatherized
furnaces.
SPECIFICATIONS
Gas
Heating
Performance
Model No. EL297UH090XV48C EL297UH090XV60C EL297UH110XV48C
AHRI Ref. No. 4988513 4988514 4988515
1 AFUE 97% 97% 97%
High
Fire
Input - Btuh 88,000 88,000 110,000
Output - Btuh 86,000 86,000 106,000
Temperature rise range - °F 45 - 75 40 - 70 60 - 90
Gas Manifold Pressure (in. w.g.)
Nat. Gas / LPG/Propane
3.5 / 10.0 3.5 / 10.0 3.5 / 10.0
Low
Fire
Input - Btuh 57,000 57,000 72,000
Output - Btuh 56,000 56,000 70,000
Temperature rise range - °F 30 - 60 25 - 55 35 - 65
Gas Manifold Pressure (in. w.g.)
Nat. Gas / LPG/Propane
1.7 / 4.5 1.7 / 4.5 1.7 / 4.5
High static - in. w.g. Heating 0.8 0.8 0.8
Cooling 1.0 1.0 1.0
Connections
in.
Intake / Exhaust Pipe (PVC) 2 / 2 2 / 2 2 / 2
Gas pipe size IPS 1/2 1/2 1/2
Condensate Drain Trap (PVC pipe) - i.d. 3/4 3/4 3/4
with furnished 90° street elbow 3/4 slip x 3/4 Mipt 3/4 slip x 3/4 Mipt 3/4 slip x 3/4 Mipt
with eld supplied (PVC coupling) - o.d. 3/4 slip x 3/4 MPT 3/4 slip x 3/4 MPT 3/4 slip x 3/4 MPT
Indoor
Blower
Wheel nominal diameter x width - in. 11 x 11 11 x 11 11 x 11
Motor output - hp 3/4 13/4
Tons of add-on cooling 2.5 - 4 3 - 5 2.5 - 4
Air Volume Range - cfm 680 - 1770 840 - 2195 670 - 1760
Electrical Data Voltage 120 volts - 60 hertz - 1 phase
Blower motor full load amps 10.1 12.8 10.1
Maximum overcurrent protection 15 20 15
Shipping Data lbs. - 1 package 163 164 173
NOTE - Filters and provisions for mounting are not furnished and must be eld provided.
1 Annual Fuel Utilization E󰀩ciency based on DOE test procedures and according to FTC labeling regulations. Isolated combustion system rating for non-weatherized
furnaces.

Page 3
SPECIFICATIONS
Gas
Heating
Performance
Model No. EL297UH110XV60C EL297UH135XV60D
1 AFUE 97% 97%
High
Fire
Input - Btuh 110,000 132,000
Output - Btuh 107,000 127,000
Temperature rise range - °F 45 - 75 55 - 85
Gas Manifold Pressure (in. w.g.)
Nat. Gas / LPG/Propane
3.5 / 10.0 3.5 / 10.0
Low
Fire
Input - Btuh 72,000 86,000
Output - Btuh 70,000 84,000
Temperature rise range - °F 35 - 65 40 - 70
Gas Manifold Pressure (in. w.g.)
Nat. Gas / LPG/Propane
1.7 / 4.5 1.7 / 4.5
High static - in. w.g. Heating 0.8 0.8
Cooling 1.0 1.0
Connections
in.
Intake / Exhaust Pipe (PVC) 2 / 2 2 / 2
Gas pipe size IPS 1/2 1/2
Condensate Drain Trap (PVC pipe) - i.d. 3/4 3/4
with furnished 90° street elbow 3/4 slip x 3/4 Mipt 3/4 slip x 3/4 Mipt
with eld supplied (PVC coupling) - o.d. 3/4 slip x 3/4 MPT 3/4 slip x 3/4 MPT
Indoor
Blower
Wheel nominal diameter x width - in. 11 x 11 11 x 11
Motor output - hp 1 1
Tons of add-on cooling 3-5 3-5
Air Volume Range - cfm 850 - 2125 950 - 2250
Electrical Data Voltage 120 volts - 60 hertz - 1 phase
Blower motor full load amps 12.8 12.8
Maximum overcurrent protection 20 20
Shipping Data lbs. - 1 package 174 188
NOTE - Filters and provisions for mounting are not furnished and must be eld provided.
1 Annual Fuel Utilization E󰀩ciency based on DOE test procedures and according to FTC labeling regulations. Isolated combustion system rating for non-weatherized
furnaces.

Page 4
BLOWER DATA
EL297UH045XV36B 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
1Heating Speed
DIP Switch
Settings
First Stage Heating Speed - cfm Second Stage Heating Speed - cfm
+24% 915 1125
+18% 865 1085
+12% 805 1040
+6% 780 985
Factory Default 740 925
–6% 665 875
–12% 630 800
–18% 585 735
COOLING
1Cooling Speed
DIP Switch
Settings
First Stage Cooling Speed - cfm Second Stage Cooling Speed - cfm
Low Medium-Low Medium-High 2High Low Medium-Low Medium-High 2High
[phone] 1075 1210 1370
Factory Default 540 660 785 890 815 980 1120 1255
–485 600 695 790 720 885 1020 1135
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 e󰀨ect 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% and 38% of the selected second stage cooling speed - minimum 250 cfm.
Lennox® Smart Zoning System Applications - Minimum blower speed is 250 cfm.
EL297UH045XV36B BLOWER MOTOR WATTS (COOLING)
1Cooling Speed
DIP Switch
Settings
Motor Watts @ Various External Static Pressures - in. wg.
First Stage Second Stage
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
+ Setting
Cooling
Speed
Low 18 33 54 73 88 107 124 144 158 64 87 112 140 171 196 225 243 267 297 317
Med-low 36 58 82 100 120 141 166 182 211 127 138 185 214 237 271 296 326 348 369 390
Med-High 57 86 103 128 159 187 210 233 255 189 219 250 280 305 340 377 411 439 464 483
High 91 114 142 177 217 235 259 285 311 267 281 322 363 400 433 468 502 521 552 549
Factory Default
Cooling
Speed
Low 16 34 52 67 86 98 120 138 155 46 69 91 115 142 167 188 206 232 260 280
Med-low 25 35 65 85 110 125 140 155 180 93 110 138 173 209 230 255 280 304 325 343
Med-High 41 66 87 106 129 154 178 195 223 150 166 206 238 264 293 320 349 376 399 420
High 61 87 110 138 169 194 222 241 265 213 245 269 300 334 368 399 431 460 480 513
– Setting
Cooling
Speed
Low 10 28 40 56 76 89 106 122 137 33 52 78 97 116 132 159 174 202 224 238
Med-low 18 34 55 73 89 108 124 145 159 59 86 104 129 160 187 211 234 256 282 303
Med-High 29 45 72 92 114 129 151 166 193 107 122 157 188 221 247 273 302 324 343 361
High 44 67 89 111 135 160 183 200 227 160 185 214 246 277 302 335 364 391 414 435

Page 5
BLOWER DATA
EL297UH045XV36B BLOWER PERFORMANCE (less lter)
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
1Heating Speed
DIP Switch
Settings
First Stage Heating Speed - cfm Second Stage Heating Speed - cfm
+24% 910 1125
+18% 850 1080
+12% 785 1035
+6% 765 990
Factory Default 755 935
–6% 690 880
–12% 635 810
–18% 600 765
COOLING
1Cooling Speed
DIP Switch
Settings
First Stage Cooling Speed - cfm Second Stage Cooling Speed - cfm
Low Medium-Low Medium-High 2High Low Medium-Low Medium-High 2High
[phone] 1065 1205 1340
Factory Default 550 680 770 880 815 985 1110 1245
–465 610 720 775 745 890 1020 1130
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 e󰀨ect 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% and 38% of the selected second stage cooling speed - minimum 250 cfm.
Lennox® Smart Zoning System Applications - Minimum blower speed is 250 cfm.
EL297UH045XV36B BLOWER MOTOR WATTS (COOLING)
1Cooling Speed
DIP Switch
Settings
Motor Watts @ Various External Static Pressures - in. wg.
First Stage Second Stage
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
+ Setting
Cooling
Speed
Low 19 37 57 74 97 116 136 151 168 55 82 104 135 158 194 221 243 270 297 314
Med-low 34 57 80 103 124 148 168 195 216 103 123 159 193 225 254 282 307 338 361 389
Med-High 45 74 98 123 150 179 204 236 260 164 198 225 260 287 326 352 391 428 450 478
High 76 103 133 163 191 223 256 277 303 235 256 294 346 374 409 445 478 510 541 551
Factory Default
Cooling
Speed
Low 16 31 52 67 85 100 118 136 150 38 68 90 106 133 162 188 212 239 262 286
Med-low 20 45 65 85 110 125 145 170 195 75 99 128 159 187 219 251 273 299 323 350
Med-High 38 64 88 106 130 157 180 207 230 125 145 186 216 248 278 303 331 365 388 419
High 51 81 103 133 157 191 218 242 268 182 210 245 273 317 346 376 410 440 465 497
– Setting
Cooling
Speed
Low 10 28 40 59 73 89 105 121 138 30 52 72 100 119 141 159 185 206 228 253
Med-low 20 38 58 75 97 116 136 151 169 48 75 99 124 151 180 205 237 261 285 303
Med-High 27 48 69 93 116 133 152 178 203 85 107 139 172 201 233 266 286 312 337 364
High 38 66 89 106 131 159 184 209 235 134 155 196 223 259 290 316 344 374 399 432

Page 6
BLOWER DATA
EL297UH045XV36B BLOWER PERFORMANCE (less lter)
SINGLE 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
1Heating Speed
DIP Switch
Settings
First Stage Heating Speed - cfm Second Stage Heating Speed - cfm
+24% 895 1115
+18% 850 1070
+12% 795 1030
+6% 755 980
Factory Default 715 920
–6% 665 850
–12% 645 805
–18% 595 740
COOLING
1Cooling Speed
DIP Switch
Settings
First Stage Cooling Speed - cfm Second Stage Cooling Speed - cfm
Low Medium-Low Medium-High 2High Low Medium-Low Medium-High 2High
[phone] 1060 1185 1345
Factory Default 550 660 760 875 820 975 1105 1215
–490 610 685 770 720 860 1015 1125
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 e󰀨ect 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% and 38% of the selected second stage cooling speed - minimum 250 cfm.
Lennox® Smart Zoning System Applications - Minimum blower speed is 250 cfm.
EL297UH045XV36B BLOWER MOTOR WATTS (COOLING)
1Cooling Speed
DIP Switch
Settings
Motor Watts @ Various External Static Pressures - in. wg.
First Stage Second Stage
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
+ Setting
Cooling
Speed
Low 20 36 57 77 99 111 133 149 168 54 82 99 130 157 180 210 238 259 282 308
Med-low 28 50 72 97 118 141 161 184 207 103 122 159 189 220 250 277 303 331 353 382
Med-High 45 74 94 121 148 170 201 221 254 162 188 227 259 283 318 353 383 414 435 473
High 73 98 130 157 186 219 247 274 294 224 249 283 326 366 398 433 473 491 529 545
Factory Default
Cooling
Speed
Low 14 32 47 62 82 100 119 132 149 38 63 82 109 131 161 176 210 231 250 272
Med-low 20 40 60 80 105 120 145 160 180 74 96 125 152 182 214 242 268 289 313 335
Med-High 31 57 76 104 126 153 170 196 223 123 143 180 215 240 272 300 326 359 379 408
High 51 81 98 128 156 178 208 235 258 173 206 240 261 297 337 365 402 431 456 490
– Setting
Cooling
Speed
Low 8 27 38 54 73 88 106 119 137 27 46 71 92 112 133 155 178 195 214 242
Med-low 21 37 57 77 100 112 134 149 169 48 75 95 122 149 171 201 222 255 271 294
Med-High 25 44 67 86 110 127 150 170 187 84 105 139 167 197 229 256 284 305 330 355
High 34 60 79 106 128 157 173 203 227 130 153 188 225 248 282 307 339 371 392 420

Page 7
BLOWER DATA
EL297UH070XV36B 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
1Heating Speed
DIP Switch
Settings
First Stage Heating Speed - cfm Second Stage Heating Speed - cfm
+24% 1095 1220
+18% 1035 1170
+12% 985 1120
+6% 915 1055
Factory Default 850 995
–6% 835 915
–12% 755 845
–18% 695 810
COOLING
1Cooling Speed
DIP Switch
Settings
First Stage Cooling Speed - cfm Second Stage Cooling Speed - cfm
Low Medium-Low Medium-High 2High Low Medium-Low Medium-High 2High
[phone] 1060 1215 1365
Factory Default 555 665 770 855 810 960 1130 1265
–500 600 680 790 705 840 1005 1140
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 e󰀨ect 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% and 38% of the selected second stage cooling speed - minimum 250 cfm.
Lennox® Smart Zoning System Applications - Minimum blower speed is 250 cfm.
EL297UH070XV36B BLOWER MOTOR WATTS (COOLING)
1Cooling Speed
DIP Switch
Settings
Motor Watts @ Various External Static Pressures - in. wg.
First Stage Second Stage
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
+ Setting
Cooling
Speed
Low 22 36 51 60 80 95 101 117 138 68 88 105 129 152 169 198 214 231 244 274
Med-low 37 57 75 89 106 127 148 168 182 121 144 168 192 211 243 262 287 305 329 358
Med-High 62 85 97 122 144 164 180 203 220 213 231 259 285 311 328 357 374 397 419 445
High 88 115 132 155 176 203 233 240 274 304 322 359 379 411 442 458 486 502 527 554
Factory Default
Cooling
Speed
Low 16 29 42 55 71 82 98 112 120 52 69 86 107 122 146 165 183 199 212 229
Med-low 26 41 63 79 88 112 128 145 159 89 108 135 151 174 198 223 247 268 288 298
Med-High 39 62 77 96 117 140 156 180 196 151 173 201 225 243 266 289 313 339 368 383
High 65 84 104 125 148 166 178 206 225 237 256 284 303 328 343 374 395 421 435 454
– Setting
Cooling
Speed
Low 11 21 35 53 64 75 82 95 113 34 50 67 86 106 121 141 159 174 186 201
Med-low 21 36 51 66 81 92 107 127 141 64 85 100 114 145 160 182 206 219 237 251
Med-High 35 48 66 82 104 118 137 146 159 101 125 143 171 193 211 242 258 282 304 330
High 43 60 82 100 123 144 159 174 197 161 188 211 229 258 277 307 327 354 379 404

Page 8
BLOWER DATA
EL297UH070XV36B BLOWER PERFORMANCE (less lter)
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
1Heating Speed
DIP Switch
Settings
First Stage Heating Speed - cfm Second Stage Heating Speed - cfm
+24% 1090 1205
+18% 1025 1165
+12% 960 1090
+6% 890 1045
Factory Default 815 975
–6% 755 895
–12% 720 810
–18% 675 750
COOLING
1Cooling Speed
DIP Switch
Settings
First Stage Cooling Speed - cfm Second Stage Cooling Speed - cfm
Low Medium-Low Medium-High 2High Low Medium-Low Medium-High 2High
[phone] 1050 1205 1355
Factory Default 540 640 725 820 750 945 1130 1230
–500 580 665 720 685 805 990 1110
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 e󰀨ect 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% and 38% of the selected second stage cooling speed - minimum 250 cfm.
Lennox® Smart Zoning System Applications - Minimum blower speed is 250 cfm.
EL297UH070XV36B BLOWER MOTOR WATTS (COOLING)
1Cooling Speed
DIP Switch
Settings
Motor Watts @ Various External Static Pressures - in. wg.
First Stage Second Stage
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
+ Setting
Cooling
Speed
Low 17 29 48 61 73 94 100 123 130 63 84 104 117 142 160 174 208 215 245 255
Med-low 30 50 66 79 107 128 137 159 178 121 137 165 195 213 239 257 283 303 329 342
Med-High 51 70 92 106 127 150 170 184 207 195 214 243 268 290 324 348 370 387 409 434
High 88 109 134 150 184 201 221 243 265 294 309 344 372 399 421 445 474 495 520 532
Factory Default
Cooling
Speed
Low 12 25 38 52 66 83 96 105 117 43 65 75 98 120 139 152 170 192 212 228
Med-low 22 41 55 70 86 103 123 141 154 88 106 130 150 173 197 220 239 259 276 297
Med-High 36 55 75 90 107 129 152 167 184 142 161 187 211 239 263 287 307 332 352 369
High 57 76 99 116 135 153 176 197 213 220 236 267 294 323 342 364 382 411 436 455
– Setting
Cooling
Speed
Low 8 22 32 50 60 77 86 100 116 31 48 63 83 102 122 137 150 166 188 203
Med-low 19 32 47 63 77 93 103 120 133 53 75 91 111 129 152 169 188 210 227 251
Med-High 25 42 58 74 90 109 131 143 154 101 120 141 170 190 215 233 256 274 298 317
High 37 56 76 95 115 135 153 173 192 157 177 201 224 254 277 303 321 346 362 385

Page 9
BLOWER DATA
EL297UH070XV36B BLOWER PERFORMANCE (less lter)
SINGLE 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
1Heating Speed
DIP Switch
Settings
First Stage Heating Speed - cfm Second Stage Heating Speed - cfm
+24% 1070 1205
+18% 1020 1150
+12% 955 1100
+6% 895 1035
Factory Default 850 965
–6% 795 905
–12% 745 845
–18% 690 790
COOLING
1Cooling Speed
DIP Switch
Settings
First Stage Cooling Speed - cfm Second Stage Cooling Speed - cfm
Low Medium-Low Medium-High 2High Low Medium-Low Medium-High 2High
[phone] 1045 1205 1350
Factory Default 520 655 755 840 790 945 1090 1255
–490 595 670 745 720 845 985 1130
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 e󰀨ect 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% and 38% of the selected second stage cooling speed - minimum 250 cfm.
Lennox® Smart Zoning System Applications - Minimum blower speed is 250 cfm.
EL297UH070XV36B BLOWER MOTOR WATTS (COOLING)
1Cooling Speed
DIP Switch
Settings
Motor Watts @ Various External Static Pressures - in. wg.
First Stage Second Stage
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
+ Setting
Cooling
Speed
Low 18 32 46 61 76 89 104 115 133 64 83 95 120 141 159 175 203 208 234 246
Med-low 34 52 69 86 104 126 141 160 174 109 131 150 179 204 219 239 268 283 313 335
Med-High 63 82 98 115 138 153 173 187 209 177 197 227 246 273 311 328 354 383 402 408
High 88 107 131 148 175 192 217 235 253 261 281 312 346 382 402 430 465 489 506 533
Factory Default
Cooling
Speed
Low 12 25 37 55 66 82 94 105 121 43 61 76 99 121 133 162 169 189 211 224
Med-low 25 40 55 74 89 109 120 136 150 76 96 112 138 162 186 207 232 243 262 281
Med-High 41 61 75 98 115 135 151 173 189 129 150 177 198 227 247 272 301 324 332 369
High 63 86 99 122 139 159 180 204 216 209 227 254 282 298 324 341 364 395 413 428
– Setting
Cooling
Speed
Low 9 20 35 48 59 75 86 94 110 29 43 63 84 99 113 131 144 164 185 197
Med-low 16 32 45 62 75 90 103 119 138 56 71 101 112 131 158 168 184 207 235 245
Med-High 28 43 63 77 98 115 132 145 162 88 107 129 154 183 204 214 245 263 281 308
High 46 61 86 100 121 136 153 172 193 142 163 187 216 236 261 279 301 325 356 375

Page 10
BLOWER DATA
EL297UH090XV36C 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
1Heating Speed
DIP Switch
Settings
First Stage Heating Speed - cfm Second Stage Heating Speed - cfm
+24% 1215 1300
+18% 1140 1240
+12% 1100 1170
+6% 1020 1115
Factory Default 965 1070
–6% 915 970
–12% 850 925
–18% 805 855
COOLING
1Cooling Speed
DIP Switch
Settings
First Stage Cooling Speed - cfm Second Stage Cooling Speed - cfm
Low Medium-Low Medium-High 2High Low Medium-Low Medium-High 2High
[phone] 1040 1210 1360
Factory Default 565 670 760 860 800 945 1100 1245
–520 610 685 785 720 840 970 1115
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 e󰀨ect 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% and 38% of the selected second stage cooling speed - minimum 250 cfm.
Lennox® Smart Zoning System Applications - Minimum blower speed is 250 cfm.
EL297UH090XV36C BLOWER MOTOR WATTS (COOLING)
1Cooling Speed
DIP Switch
Settings
Motor Watts @ Various External Static Pressures - in. wg.
First Stage Second Stage
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
+ Setting
Cooling
Speed
Low 19 33 51 67 81 97 113 128 144 47 64 90 111 127 153 174 193 215 234 250
Med-low 35 52 76 90 108 130 146 166 185 87 114 130 158 184 205 227 252 278 301 321
Med-High 51 70 92 117 138 155 181 199 219 146 170 199 223 246 277 303 329 357 379 399
High 69 94 113 133 152 177 194 222 246 225 250 277 308 329 362 391 411 442 465 489
Factory Default
Cooling
Speed
Low 14 31 44 59 75 88 104 125 137 37 54 74 94 114 135 152 175 187 209 223
Med-low 29 46 63 80 95 114 133 146 164 65 87 108 130 152 173 196 222 236 262 283
Med-High 39 56 78 97 117 137 155 175 192 102 127 152 175 202 228 246 279 306 328 345
High 46 68 86 111 126 154 174 194 214 167 184 218 253 272 301 332 360 381 402 421
– Setting
Cooling
Speed
Low 11 27 39 57 70 84 99 113 131 26 45 61 81 96 118 134 152 169 189 205
Med-low 23 39 53 71 87 103 118 133 148 44 60 85 107 127 150 169 186 207 226 247
Med-High 24 43 56 79 97 111 129 149 165 75 101 117 140 160 182 215 235 255 275 296
High 33 51 69 94 111 131 150 170 186 112 134 160 186 220 236 264 293 311 335 363