Lennox SLP98UHV SERIES Installation and operation manual

Page 1 ©2010 Lennox Industries Inc.
Corp. 1029−L7
SLP98UHV
Service Literature
SLP98UHV SERIES UNITS
SLP98UHV series units are high−efficiency upflow, horizon-
tal right and left) gas furnaces equipped with variable ca-
pacity gas valve, variable speed combustion air inducer and
variable speed indoor blower motor. All models are de-
signed only for direct vent (dual pipe) venting system.
SLP98UHV units are available in heating capacities from
66,000 to 132,000 Btuh (19.3 to 38.6 kW) and cooling ap-
plications from 2 to 5 tons (7.0 kW to 17.5 kW). Refer to En-
gineering Handbook for proper sizing.
Units are factory−equipped for use with natural gas. Kits are
available for conversion to LPG operation. SLP98UHV mod-
els include a SureLight®variable capacity integrated control
that can be used with Lennox icomfort Touchthermostat as
part of a communicating comfort system. All SLP98UHV
units meet the California Nitrogen Oxides (NOx) Standards
and California Seasonal Efficiency requirements.
All specifications in this manual are subject to change. Pro-
cedures outlined in this manual are presented as recom-
mendations only and do not supersede or replace local or
state codes. In the absence of local or state codes, the
guidelines and procedures outlined in this manual (except
where noted) are recommendations only and do not consti-
tute code.
TABLE OF CONTENTS
Specifications Page 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optional Accessories Page 3. . . . . . . . . . . . . . . . . . . . . .
Blower Data Page 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I Unit Components Page 14. . . . . . . . . . . . . . . . . . . . . . . .
II Icomfort Touch Thermostat Page 37. . . . . . . . . . . .
III Placement and Installation Page 39. . . . . . . . . . . . . . .
IV Start Up Page 53. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
V Heating System Service Checks Page 54. . . . . . . . . .
VI Typical Operating Characteristics Page 56. . . . . . . . .
VII Maintenance Page 57. . . . . . . . . . . . . . . . . . . . . . . . . .
VIII Wiring and Sequence of Operation Page 59. . . . . .
XI Field Wiring Page 67. . . . . . . . . . . . . . . . . . . . . . . . . . .
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person-
al injury or loss of life. Installation and service must
be performed by a licensed professional installer (or
equivalent), service agency or the gas supplier.
WARNING
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at discon-
nect switch(es). Unit may have multiple
power supplies.
WARNING
Sharp edges.
Be careful when servicing unit to avoid sharp edges
which may result in personal injury.

Page 2
SPECIFICATIONS
Gas
Heating
Performance
Model No. SLP98UH070V36B SLP98UH090V36C SLP98UH090V48C
1 AFUE 97.0% 98.0% 97.5%
Maximum Input - Btuh 66,000 88,000 88,000
Output - Btuh 64,000 85,000 85,000
Temperature rise range - °F 50 - 80 60 - 90 50 - 80
Gas Manifold Pressure (in. w.g.)
Nat. Gas / LPG/Propane
3.5 / 10.0 3.5 / 10.0 3.5 / 10.0
Minimum Input - Btuh 23,000 31,000 31,000
Output - Btuh 22,000 30,000 30,000
Temperature rise range - °F 35 - 65 35 - 65 35 - 65
Gas Manifold Pressure (in. w.g.)
Nat. Gas / LPG/Propane
0.5 / 1.5 0.5 / 1.5 0.5 / 1.5
High static - in. w.g. 0.8 0.8 0.8
Connections
in.
Intake / Exhaust Pipe (PVC) 2 / 2 2 / 2 2 / 2
Condensate Drain Trap (PVC pipe) - i.d. 1/2 1/2 1/2
with eld supplied (PVC coupling) - o.d. 1/2 slip x 1/2 NPT 1/2 slip x 1/2 NPT 1/2 slip x 1/2 NPT
hose with hose clamp - i.d. x o.d. 1 x 1-1/4 1 x 1-1/4 1 x 1-1/4
Gas pipe size IPS 1/2 1/2 1/2
Indoor
Blower
Wheel nominal diameter x width - in. 10 x 9 10 x 9 11 x 11
Motor output - hp 1/2 1/2 3/4
Tons of add-on cooling 2 - 3 2 - 3.5 2.5 - 4
Air Volume Range - cfm 339 - 1365 520 - 1360 528 - 1770
Electrical
Data
Voltage (Maximum Amps) 120 volts - 60 hertz - 1 phase
Blower motor full load amps 7.7 7.7 10.1
Maximum overcurrent protection 15 15 15
Shipping Data lbs. - 1 package 138 155 165
NOTE - Filters and provisions for mounting are not furnished and must be eld provided.
1 Annual Fuel Utilization Ef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. SLP98UH090V60C SLP98UH110V60C SLP98UH135V60D
1 AFUE 98.2% 97.5% 97.5%
Maximum Input - Btuh 88,000 110,000 132,000
Output - Btuh 85,000 106,000 126,000
Temperature rise range - °F 50 - 80 50 - 80 55 - 85
Gas Manifold Pressure (in. w.g.)
Nat. Gas / LPG/Propane
3.5 / 10.0 3.5 / 10.0 3.5 / 10.0
Minimum Input - Btuh 31,000 39,000 46,000
Output - Btuh 30,000 38,000 45,000
Temperature rise range - °F 35 - 65 35 - 65 35 - 65
Gas Manifold Pressure (in. w.g.)
Nat. Gas / LPG/Propane
0.5 / 1.5 0.5 / 1.5 0.5 / 1.5
High static - in. w.g. 0.8 0.8 0.8
Connections
in.
Intake / Exhaust Pipe (PVC) 2 / 2 2 / 2 2 / 2
Condensate Drain Trap (PVC pipe) - i.d. 1/2 1/2 1/2
with eld supplied (PVC coupling) - o.d. 1/2 slip x 1/2 NPT 1/2 slip x 1/2 NPT 1/2 slip x 1/2 NPT
hose with hose clamp - i.d. x o.d. 1 x 1-1/4 1 x 1-1/4 1 x 1-1/4
Gas pipe size IPS 1/2 1/2 1/2
Indoor
Blower
Wheel nominal diameter x width - in. 11 x 11 11 x 11 11 x 11
Motor output - hp 1 1 1
Tons of add-on cooling 3 - 5 3 - 5 3.5 - 5
Air Volume Range - cfm 375 - 2195 554 - 2125 634 - 2190
Electrical
Data
Voltage (Maximum Amps) 120 volts - 60 hertz - 1 phase
Blower motor full load amps 12.8 12.8 12.8
Maximum overcurrent protection 20 20 20
Shipping Data lbs. - 1 package 165 175 190
NOTE - Filters and provisions for mounting are not furnished and must be eld provided.
1 Annual Fuel Utilization Efciency based on DOE test procedures and according to FTC labeling regulations. Isolated combustion system rating for non-weatherized
furnaces.

Page 3
OPTIONAL ACCESSORIES - MUST BE ORDERED EXTRA
“B” Width
Models
“C” Width
Models
“D” Width
Models
CABINET ACCESSORIES
Horizontal Suspension Kit - Horizontal only 51W10 51W10 51W10
Return Air Base - Upow only 50W98 50W99 51W00
CONDENSATE DRAIN KITS
Condensate Drain Heat Cable 6 ft. 26K68 26K68 26K68
24 ft. 26K69 26K69 26K69
50 ft. 26K70 26K70 26K70
Heat Cable Tape Fiberglass - 1/2 in. x 66 ft. 36G53 36G53 36G53
Aluminum foil - 2 in. x 60 ft. 16P89 16P89 16P89
Crawl Space Vent Drain Kit 51W18 51W18 51W18
CONTROLS
icomfort Touch™ Communicating Thermostat 49W95 49W95 49W95
1 Remote Outdoor Temperature Sensor
(for dual fuel and Humiditrol®)
X2658 X2658 X2658
2 Discharge Temperature Sensor 88K38 88K38 88K38
ComfortSense® 7000 Thermostat Y2081 Y2081 Y2081
3 Remote Outdoor Temperature Sensor
(for dual fuel and Humiditrol)
X2658 X2658 X2658
FILTER KITS
4 Air Filter and
Rack Kit
Horizontal (end) Size of lter - in. 87L96 - 18 x 25 x 1 87L97 - 20 x 25 x 1 87L98 - 25 x 25 x 1
Side Return Single 44J22 44J22 44J22
Ten Pack 66K63 66K63 66K63
Size of lter - in. 16 x 25 x 1 16 x 25 x 1 16 x 25 x 1
NIGHT SERVICE KITS
Night Service Kit 65W78 65W78 65W78
Safety Night Service Kit 51W05 51W05 51W05
TERMINATION KITS
Direct Vent Applications Only. See Installation Instructions for specic venting information.
Termination Kits Concentric US - 2 in. 71M80 69M29 - - -
3 in. - - - 60L46 60L46
Canada - 2 in. 44W92 44W92 - - -
3 in. - - - 44W93 44W93
Flush-Mount 2, 2-1/2 or 3 in. 51W11 51W11 51W11
Wall - Close
Couple
US - 2 in. 22G44 - - - - - -
3 in. 44J40 44J40 44J40
Wall - Close
Couple WTK
Canada - 2 in. 30G28 - - - - - -
3 in. 81J20 81J20 81J20
Roof 2 in. 15F75 15F75 - - -
Wall Ring Kit 2 in. 15F74 15F74 - - -
Roof Termination Flashing Kit (2 ashings) 2 in. 44J41 44J41 44J41
1 Remote Outdoor Sensor may be used with an icomfort™-enabled outdoor unit for a secondary (alternate) sensor reading. Sensor may also be used with a
conventional outdoor unit.
2 Optional for service diagnostics.
3 Remote Outdoor Temperature Sensor for ComfortSense 7000 Thermostat must be connected directly to the thermostat, Do not connect it to the icomfort™ control board.
4 Cleanable polyurethane frame type lter.
NOTE - Termination Kits 44W92, 44W93, 30G28, 81J20 are certied to ULC S636 standard for use in Canada only.
GAS HEAT ACCESSORIES
Input High Altitude
Pressure Switch Kit
Natural Gas to
LPG/Propane Kit
LPG/Propane to
Natural Gas Kit
7501 - 10,000 ft. 0 - 10,000 ft. 0 - 10,000 ft.
All models 73W89 65W77 70W87

Page 4
BLOWER DATA
SLP98UH070V36B BLOWER PERFORMANCE (less lter)
BOTTOM RETURN AIR
HEATING BLOWER PERFORMANCE
Heating Adjust CFM Selections Heating Input Range and Blower Volume - CFM
35% 40% 50% 60% 70% 80% 90% 100%
Increase (+15%) Heat CFM 489 538 636 735 833 931 1030 1128
Increase (+7.5%) Heat CFM 450 496 588 680 772 864 956 1048
Default Heat CFM 410 453 539 624 710 796 881 967
Decrease (-7.5% ) Heat CFM 380 419 498 578 657 736 815 895
Decrease (-15% ) Heat CFM 349 385 458 531 604 676 749 822
COOLING BLOWER PERFORMANCE
Cooling Adjust CFM
Selections
Blower Speed Selections
First Stage Cool Speed - cfm Second Stage Cool Speed - cfm
Low Medium-
Low
Medium
High
High
(Default)
Low Medium-
Low
Medium
High
High
(Default)
Increase (+10%) Cool CFM 600 740 840 970 860 1060 1215 1365
Default Cool CFM 555 665 770 855 810 960 1130 1265
Decrease (-10%) Cool CFM 500 600 680 790 705 840 1005 1140
The effect of static pressure is included in air volumes shown.
The following control congurations are available. See Installation Instructions for details and DIP switch settings.
Heat Modes Available (Heating Blower Performance Table):
Single stage thermostat:
- 35%, 70%, 100% input (three-stage) with time delays in-between
Two-stage thermostat:
- Variable Rate Capacity Mode - furnace automatically adjusts ring rate based on rst- and second-stage cycle times
- W1 demand at 70% input, W2 demand at 100% input. No delay between stages
icomfort Touch™ Communicating Thermostat:
- Variable Rate Capacity Mode - furnace automatically adjusts ring rate based on rst- and second-stage cycle times
- 35%, 60%, 80%, 100% (four-stage) with time delays in-between
Cool Mode Available (Cooling Blower Performance table):
First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position.
Continuous Fan speeds are approximately 28%, 38%, 70% and 100% (DIP switch selectable) of the same second-stage COOL speed position
minimum 300 cfm.
Lennox Harmony III™ Zoning System Applications - Minimum blower speed is 250 cfm.
SLP98UH070V36B BLOWER PERFORMANCE (less lter)
RIGHT SIDE RETURN AIR
HEATING BLOWER PERFORMANCE
Heating Adjust CFM Selections Heating Input Range and Blower Volume - CFM
35% 40% 50% 60% 70% 80% 90% 100%
Increase (+15%) Heat CFM 484 531 625 718 812 906 999 1093
Increase (+7.5%) Heat CFM 446 490 579 667 756 845 933 1022
Default Heat CFM 407 449 533 616 700 784 867 951
Decrease (-7.5% ) Heat CFM 377 413 487 561 635 709 783 857
Decrease (-15% ) Heat CFM 346 378 442 506 571 635 699 763
COOLING BLOWER PERFORMANCE
Cooling Adjust CFM
Selections
Blower Speed Selections
First Stage Cool Speed - cfm Second Stage Cool Speed - cfm
Low Medium-
Low
Medium
High
High
(Default)
Low Medium-
Low
Medium
High
High
(Default)
Increase (+10%) Cool CFM 590 705 805 955 840 1050 1205 1355
Default Cool CFM 540 640 725 820 750 945 1130 1230
Decrease (-10%) Cool CFM 500 580 665 720 685 805 990 1110

Page 5
BLOWER DATA
SLP98UH070V36B BLOWER PERFORMANCE (less lter)
RIGHT SIDE RETURN AIR WITH OPTIONAL RETURN AIR BASE
HEATING BLOWER PERFORMANCE
Heating Adjust CFM Selections Heating Input Range and Blower Volume - CFM
35% 40% 50% 60% 70% 80% 90% 100%
Increase (+15%) Heat CFM 471 519 614 709 805 900 996 1091
Increase (+7.5%) Heat CFM 435 480 570 660 751 841 931 1021
Default Heat CFM 399 441 526 611 696 781 866 951
Decrease (-7.5% ) Heat CFM 369 408 486 564 643 721 799 877
Decrease (-15% ) Heat CFM 339 375 446 517 589 660 732 803
COOLING BLOWER PERFORMANCE
Cooling Adjust CFM
Selections
Blower Speed Selections
First Stage Cool Speed - cfm Second Stage Cool Speed - cfm
Low Medium-
Low
Medium
High
High
(Default)
Low Medium-
Low
Medium
High
High
(Default)
Increase (+10%) Cool CFM 595 715 815 950 855 1045 1205 1350
Default Cool CFM 520 655 755 840 790 945 1090 1255
Decrease (-10%) Cool CFM 490 595 670 745 720 845 985 1130
The effect of static pressure is included in air volumes shown.
The following control congurations are available. See Installation Instructions for details and DIP switch settings.
Heat Modes Available (Heating Blower Performance Table):
Single stage thermostat:
- 35%, 70%, 100% input (three-stage) with time delays in-between
Two-stage thermostat:
- Variable Rate Capacity Mode - furnace automatically adjusts ring rate based on rst- and second-stage cycle times
- W1 demand at 70% input, W2 demand at 100% input. No delay between stages
icomfort Touch™ Communicating Thermostat:
- Variable Rate Capacity Mode - furnace automatically adjusts ring rate based on rst- and second-stage cycle times
- 35%, 60%, 80%, 100% (four-stage) with time delays in-between
Cool Mode Available (Cooling Blower Performance table):
First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position.
Continuous Fan speeds are approximately 28%, 38%, 70% and 100% (DIP switch selectable) of the same second-stage COOL speed position
minimum 300 cfm.
Lennox Harmony III™ Zoning System Applications - Minimum blower speed is 250 cfm.
SLP98UH090V36C BLOWER PERFORMANCE (less lter)
BOTTOM RETURN AIR
HEATING BLOWER PERFORMANCE
Heating Adjust CFM Selections Heating Input Range and Blower Volume - CFM
35% 40% 50% 60% 70% 80% 90% 100%
Increase (+15%) Heat CFM 687 734 827 921 1014 1108 1201 1295
Increase (+7.5%) Heat CFM 654 697 782 867 953 1038 1123 1209
Default Heat CFM 621 660 737 814 891 968 1045 1122
Decrease (-7.5% ) Heat CFM 581 616 687 757 828 899 970 1041
Decrease (-15% ) Heat CFM 540 572 637 701 766 830 895 959
COOLING BLOWER PERFORMANCE
Cooling Adjust CFM
Selections
Blower Speed Selections
First Stage Cool Speed - cfm Second Stage Cool Speed - cfm
Low Medium-
Low
Medium
High
High
(Default)
Low Medium-
Low
Medium
High
High
(Default)
Increase (+10%) Cool CFM 625 710 830 950 875 1040 1210 1360
Default Cool CFM 565 670 760 860 800 945 1100 1240
Decrease (-10%) Cool CFM 520 610 685 785 720 840 970 1115

Page 6
BLOWER DATA
SLP98UH090V36C BLOWER PERFORMANCE (less lter)
RIGHT SIDE RETURN AIR
HEATING BLOWER PERFORMANCE
Heating Adjust CFM Selections Heating Input Range and Blower Volume - CFM
35% 40% 50% 60% 70% 80% 90% 100%
Increase (+15%) Heat CFM 657 702 792 881 971 1061 1150 1240
Increase (+7.5%) Heat CFM 631 673 757 841 926 1010 1094 1178
Default Heat CFM 605 644 723 802 880 959 1037 1116
Decrease (-7.5% ) Heat CFM 574 608 676 745 814 882 951 1020
Decrease (-15% ) Heat CFM 542 571 630 689 747 806 864 923
COOLING BLOWER PERFORMANCE
Cooling Adjust CFM
Selections
Blower Speed Selections
First Stage Cool Speed - cfm Second Stage Cool Speed - cfm
Low Medium-
Low
Medium
High
High
(Default)
Low Medium-
Low
Medium
High
High
(Default)
Increase (+10%) Cool CFM 610 705 795 920 840 1015 1165 1300
Default Cool CFM 560 640 715 810 770 910 1050 1190
Decrease (-10%) Cool CFM 525 605 665 725 695 795 945 1110
The effect of static pressure is included in air volumes shown.
The following control congurations are available. See Installation Instructions for details and DIP switch settings.
Heat Modes Available (Heating Blower Performance Table):
Single stage thermostat:
- 35%, 70%, 100% input (three-stage) with time delays in-between
Two-stage thermostat:
- Variable Rate Capacity Mode - furnace automatically adjusts ring rate based on rst- and second-stage cycle times
- W1 demand at 70% input, W2 demand at 100% input. No delay between stages
icomfort Touch™ Communicating Thermostat:
- Variable Rate Capacity Mode - furnace automatically adjusts ring rate based on rst- and second-stage cycle times
- 35%, 60%, 80%, 100% (four-stage) with time delays in-between
Cool Mode Available (Cooling Blower Performance table):
First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position.
Continuous Fan speeds are approximately 28%, 38%, 70% and 100% (DIP switch selectable) of the same second-stage COOL speed position
minimum 300 cfm.
Lennox Harmony III™ Zoning System Applications - Minimum blower speed is 250 cfm.
SLP98UH090V36C BLOWER PERFORMANCE (less lter)
RIGHT SIDE RETURN AIR WITH OPTIONAL RETURN AIR BASE
HEATING BLOWER PERFORMANCE
Heating Adjust CFM Selections Heating Input Range and Blower Volume - CFM
35% 40% 50% 60% 70% 80% 90% 100%
Increase (+15%) Heat CFM 677 721 810 899 988 1076 1165 1254
Increase (+7.5%) Heat CFM 639 679 760 842 923 1004 1085 1167
Default Heat CFM 600 637 711 784 858 932 1005 1079
Decrease (-7.5% ) Heat CFM 573 606 673 740 806 873 939 1006
Decrease (-15% ) Heat CFM 546 576 635 695 754 814 873 933
COOLING BLOWER PERFORMANCE
Cooling Adjust CFM
Selections
Blower Speed Selections
First Stage Cool Speed - cfm Second Stage Cool Speed - cfm
Low Medium-
Low
Medium
High
High
(Default)
Low Medium-
Low
Medium
High
High
(Default)
Increase (+10%) Cool CFM 605 715 810 930 850 995 1165 1305
Default Cool CFM 570 660 735 820 775 905 1050 1205
Decrease (-10%) Cool CFM 530 600 670 725 710 800 945 1070

Page 7
BLOWER DATA
SLP98UH090V48C BLOWER PERFORMANCE (less lter)
BOTTOM RETURN AIR
HEATING BLOWER PERFORMANCE
Heating Adjust CFM Selections Heating Input Range and Blower Volume - CFM
35% 40% 50% 60% 70% 80% 90% 100%
Increase (+15%) Heat CFM 769 835 968 1101 1234 1367 1500 1633
Increase (+7.5%) Heat CFM 713 776 902 1028 1155 1281 1407 1534
Default Heat CFM 656 716 836 955 1075 1195 1314 1434
Decrease (-7.5% ) Heat CFM 595 652 767 882 997 1112 1227 1342
Decrease (-15% ) Heat CFM 534 589 699 809 919 1029 1139 1249
COOLING BLOWER PERFORMANCE
Cooling Adjust CFM
Selections
Blower Speed Selections
First Stage Cool Speed - cfm Second Stage Cool Speed - cfm
Low Medium-
Low
Medium
High
High
(Default)
Low Medium-
Low
Medium
High
High
(Default)
Increase (+10%) Cool CFM 840 1005 1155 1315 1165 1375 1580 1770
Default Cool CFM 780 915 1045 1190 1075 1265 1440 1645
Decrease (-10%) Cool CFM 690 835 955 1070 935 1145 1320 1465
The effect of static pressure is included in air volumes shown.
The following control congurations are available. See Installation Instructions for details and DIP switch settings.
Heat Modes Available (Heating Blower Performance Table):
Single stage thermostat:
- 35%, 70%, 100% input (three-stage) with time delays in-between
Two-stage thermostat:
- Variable Rate Capacity Mode - furnace automatically adjusts ring rate based on rst- and second-stage cycle times
- W1 demand at 70% input, W2 demand at 100% input. No delay between stages
icomfort Touch™ Communicating Thermostat:
- Variable Rate Capacity Mode - furnace automatically adjusts ring rate based on rst- and second-stage cycle times
- 35%, 60%, 80%, 100% (four-stage) with time delays in-between
Cool Mode Available (Cooling Blower Performance table):
First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position.
Continuous Fan speeds are approximately 28%, 38%, 70% and 100% (DIP switch selectable) of the same second-stage COOL speed position
minimum 300 cfm.
Lennox Harmony III™ Zoning System Applications - Minimum blower speed is 380 cfm.
SLP98UH090V48C BLOWER PERFORMANCE (less lter)
RIGHT SIDE RETURN AIR
HEATING BLOWER PERFORMANCE
Heating Adjust CFM Selections Heating Input Range and Blower Volume - CFM
35% 40% 50% 60% 70% 80% 90% 100%
Increase (+15%) Heat CFM 747 812 943 1073 1204 1334 1465 1595
Increase (+7.5%) Heat CFM 698 759 882 1005 1127 1250 1372 1495
Default Heat CFM 649 706 821 936 1051 1165 1280 1395
Decrease (-7.5% ) Heat CFM 589 644 755 867 978 1089 1200 1312
Decrease (-15% ) Heat CFM 528 582 690 797 905 1013 1120 1228
COOLING BLOWER PERFORMANCE
Cooling Adjust CFM
Selections
Blower Speed Selections
First Stage Cool Speed - cfm Second Stage Cool Speed - cfm
Low Medium-
Low
Medium
High
High
(Default)
Low Medium-
Low
Medium
High
High
(Default)
Increase (+10%) Cool CFM 820 1005 1135 1290 1140 1340 1525 1725
Default Cool CFM 755 880 1025 1150 1040 1235 1395 1565
Decrease (-10%) Cool CFM 680 815 925 1065 910 1120 1275 1400

Page 8
BLOWER DATA
SLP98UH090V48C BLOWER PERFORMANCE (less lter)
RIGHT SIDE RETURN AIR WITH OPTIONAL RETURN AIR BASE
HEATING BLOWER PERFORMANCE
Heating Adjust CFM Selections Heating Input Range and Blower Volume - CFM
35% 40% 50% 60% 70% 80% 90% 100%
Increase (+15%) Heat CFM 764 828 956 1084 1213 1341 1469 1597
Increase (+7.5%) Heat CFM 705 766 888 1010 1132 1255 1377 1499
Default Heat CFM 645 703 819 936 1052 1168 1285 1401
Decrease (-7.5% ) Heat CFM 594 650 762 874 986 1099 1211 1323
Decrease (-15% ) Heat CFM 542 596 704 812 921 1029 1137 1245
COOLING BLOWER PERFORMANCE
Cooling Adjust CFM
Selections
Blower Speed Selections
First Stage Cool Speed - cfm Second Stage Cool Speed - cfm
Low Medium-
Low
Medium
High
High
(Default)
Low Medium-
Low
Medium
High
High
(Default)
Increase (+10%) Cool CFM 840 955 1120 1280 1160 1360 1530 1740
Default Cool CFM 775 910 1010 1170 1060 1240 1400 1590
Decrease (-10%) Cool CFM 695 815 930 1045 925 1130 1295 1440
The effect of static pressure is included in air volumes shown.
The following control congurations are available. See Installation Instructions for details and DIP switch settings.
Heat Modes Available (Heating Blower Performance Table):
Single stage thermostat:
- 35%, 70%, 100% input (three-stage) with time delays in-between
Two-stage thermostat:
- Variable Rate Capacity Mode - furnace automatically adjusts ring rate based on rst- and second-stage cycle times
- W1 demand at 70% input, W2 demand at 100% input. No delay between stages
icomfort Touch™ Communicating Thermostat:
- Variable Rate Capacity Mode - furnace automatically adjusts ring rate based on rst- and second-stage cycle times
- 35%, 60%, 80%, 100% (four-stage) with time delays in-between
Cool Mode Available (Cooling Blower Performance table):
First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position.
Continuous Fan speeds are approximately 28%, 38%, 70% and 100% (DIP switch selectable) of the same second-stage COOL speed position
minimum 300 cfm.
Lennox Harmony III™ Zoning System Applications - Minimum blower speed is 380 cfm (SLP98UH090V48C) and 450 cfm (SLP98UH090V60C).
SLP98UH090V60C BLOWER PERFORMANCE (less lter)
BOTTOM RETURN AIR
HEATING BLOWER PERFORMANCE
Heating Adjust CFM Selections Heating Input Range and Blower Volume - CFM
35% 40% 50% 60% 70% 80% 90% 100%
Increase (+15%) Heat CFM 583 665 830 995 1159 1324 1488 1653
Increase (+7.5%) Heat CFM 540 618 774 930 1085 1241 1397 1553
Default Heat CFM 497 571 718 865 1012 1159 1306 1453
Decrease (-7.5% ) Heat CFM 439 507 644 781 917 1054 1191 1328
Decrease (-15% ) Heat CFM 380 443 570 697 823 950 1076 1203
COOLING BLOWER PERFORMANCE
Cooling Adjust CFM
Selections
Blower Speed Selections
First Stage Cool Speed - cfm Second Stage Cool Speed - cfm
Low Medium-
Low
Medium
High
High
(Default)
Low Medium-
Low
Medium
High
High
(Default)
Increase (+10%) Cool CFM 1050 1270 1445 1620 1590 1815 2010 2195
Default Cool CFM 975 1120 1295 1460 1460 1645 1845 2010
Decrease (-10%) Cool CFM 865 1010 1120 1290 1320 1500 1645 1860

Page 9
BLOWER DATA
SLP98UH090V60C BLOWER PERFORMANCE (less lter)
RIGHT SIDE RETURN AIR
HEATING BLOWER PERFORMANCE
Heating Adjust CFM Selections Heating Input Range and Blower Volume - CFM
35% 40% 50% 60% 70% 80% 90% 100%
Increase (+15%) Heat CFM 609 684 835 986 1136 1287 1437 1588
Increase (+7.5%) Heat CFM 551 623 769 914 1059 1205 1350 1496
Default Heat CFM 492 562 702 842 983 1123 1263 1403
Decrease (-7.5% ) Heat CFM 436 502 633 765 896 1028 1159 1291
Decrease (-15% ) Heat CFM 380 441 564 687 810 932 1055 1178
COOLING BLOWER PERFORMANCE
Cooling Adjust CFM
Selections
Blower Speed Selections
First Stage Cool Speed - cfm Second Stage Cool Speed - cfm
Low Medium-
Low
Medium
High
High
(Default)
Low Medium-
Low
Medium
High
High
(Default)
Increase (+10%) Cool CFM 1040 1225 1380 1550 1555 1715 1920 2135
Default Cool CFM 960 1085 1225 1415 1430 1565 1790 1980
Decrease (-10%) Cool CFM 840 990 1085 1250 1280 1450 1580 1790
The effect of static pressure is included in air volumes shown.
The following control congurations are available. See Installation Instructions for details and DIP switch settings.
Heat Modes Available (Heating Blower Performance Table):
Single stage thermostat:
- 35%, 70%, 100% input (three-stage) with time delays in-between
Two-stage thermostat:
- Variable Rate Capacity Mode - furnace automatically adjusts ring rate based on rst- and second-stage cycle times
- W1 demand at 70% input, W2 demand at 100% input. No delay between stages
icomfort Touch™ Communicating Thermostat:
- Variable Rate Capacity Mode - furnace automatically adjusts ring rate based on rst- and second-stage cycle times
- 35%, 60%, 80%, 100% (four-stage) with time delays in-between
Cool Mode Available (Cooling Blower Performance table):
First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position.
Continuous Fan speeds are approximately 28%, 38%, 70% and 100% (DIP switch selectable) of the same second-stage COOL speed position
minimum 300 cfm.
Lennox Harmony III™ Zoning System Applications - Minimum blower speed is 450 cfm.
SLP98UH090V60C BLOWER PERFORMANCE (less lter)
RIGHT SIDE RETURN AIR WITH OPTIONAL RETURN AIR BASE
HEATING BLOWER PERFORMANCE
Heating Adjust CFM Selections Heating Input Range and Blower Volume - CFM
35% 40% 50% 60% 70% 80% 90% 100%
Increase (+15%) Heat CFM 611 686 837 987 1138 1288 1439 1589
Increase (+7.5%) Heat CFM 554 626 771 916 1060 1205 1349 1494
Default Heat CFM 497 566 705 844 983 1121 1260 1399
Decrease (-7.5% ) Heat CFM 436 502 633 764 895 1026 1157 1288
Decrease (-15% ) Heat CFM 375 437 560 683 806 930 1053 1176
COOLING BLOWER PERFORMANCE
Cooling Adjust CFM
Selections
Blower Speed Selections
First Stage Cool Speed - cfm Second Stage Cool Speed - cfm
Low Medium-
Low
Medium
High
High
(Default)
Low Medium-
Low
Medium
High
High
(Default)
Increase (+10%) Cool CFM 1035 1230 1390 1565 1560 1740 1940 2145
Default Cool CFM 950 1085 1235 1405 1410 1585 1785 1975
Decrease (-10%) Cool CFM 855 995 1085 1235 1260 1430 1595 1785

Page 10
BLOWER DATA
SLP98UH110V60C BLOWER PERFORMANCE (less lter)
BOTTOM RETURN AIR
HEATING BLOWER PERFORMANCE
Heating Adjust CFM Selections Heating Input Range and Blower Volume - CFM
35% 40% 50% 60% 70% 80% 90% 100%
Increase (+15%) Heat CFM 767 861 1049 1237 1424 1612 1800 1988
Increase (+7.5%) Heat CFM 738 825 1000 1174 1349 1524 1699 1874
Default Heat CFM 708 789 951 1112 1274 1436 1597 1759
Decrease (-7.5% ) Heat CFM 655 731 883 1035 1187 1339 1491 1644
Decrease (-15% ) Heat CFM 602 673 816 958 1101 1243 1386 1528
COOLING BLOWER PERFORMANCE
Cooling Adjust CFM
Selections
Blower Speed Selections
First Stage Cool Speed - cfm Second Stage Cool Speed - cfm
Low Medium-
Low
Medium
High
High
(Default)
Low Medium-
Low
Medium
High
High
(Default)
Increase (+10%) Cool CFM 1060 1245 1345 1545 1560 1740 1930 2125
Default Cool CFM 970 1145 1265 1395 1405 1565 1775 1945
Decrease (-10%) Cool CFM 885 1025 1110 1250 1270 1425 1610 1770
The effect of static pressure is included in air volumes shown.
The following control congurations are available. See Installation Instructions for details and DIP switch settings.
Heat Modes Available (Heating Blower Performance Table):
Single stage thermostat:
- 35%, 70%, 100% input (three-stage) with time delays in-between
Two-stage thermostat:
- Variable Rate Capacity Mode - furnace automatically adjusts ring rate based on rst- and second-stage cycle times
- W1 demand at 70% input, W2 demand at 100% input. No delay between stages
icomfort Touch™ Communicating Thermostat:
- Variable Rate Capacity Mode - furnace automatically adjusts ring rate based on rst- and second-stage cycle times
- 35%, 60%, 80%, 100% (four-stage) with time delays in-between
Cool Mode Available (Cooling Blower Performance table):
First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position.
Continuous Fan speeds are approximately 28%, 38%, 70% and 100% (DIP switch selectable) of the same second-stage COOL speed position
minimum 300 cfm.
Lennox Harmony III™ Zoning System Applications - Minimum blower speed is 450 cfm.
SLP98UH110V60C BLOWER PERFORMANCE (less lter)
RIGHT SIDE RETURN AIR
HEATING BLOWER PERFORMANCE
Heating Adjust CFM Selections Heating Input Range and Blower Volume - CFM
35% 40% 50% 60% 70% 80% 90% 100%
Increase (+15%) Heat CFM 733 825 1009 1194 1378 1562 1747 1931
Increase (+7.5%) Heat CFM 708 794 967 1139 1312 1484 1657 1829
Default Heat CFM 683 763 924 1085 1245 1406 1566 1727
Decrease (-7.5% ) Heat CFM 632 707 857 1007 1157 1307 1457 1608
Decrease (-15% ) Heat CFM 580 650 790 929 1069 1209 1348 1488
COOLING BLOWER PERFORMANCE
Cooling Adjust CFM
Selections
Blower Speed Selections
First Stage Cool Speed - cfm Second Stage Cool Speed - cfm
Low Medium-
Low
Medium
High
High
(Default)
Low Medium-
Low
Medium
High
High
(Default)
Increase (+10%) Cool CFM 1050 1195 1315 1495 1515 1710 1870 2065
Default Cool CFM 960 1095 1220 1355 1360 1555 1755 1890
Decrease (-10%) Cool CFM 850 985 1095 1220 1215 1400 1555 1755

Page 11
BLOWER DATA
SLP98UH110V60C BLOWER PERFORMANCE (less lter)
RIGHT SIDE RETURN AIR WITH OPTIONAL RETURN AIR BASE
HEATING BLOWER PERFORMANCE
Heating Adjust CFM Selections Heating Input Range and Blower Volume - CFM
35% 40% 50% 60% 70% 80% 90% 100%
Increase (+15%) Heat CFM 805 893 1068 1243 1419 1594 1770 1945
Increase (+7.5%) Heat CFM 729 814 986 1157 1329 1500 1672 1843
Default Heat CFM 652 736 903 1071 1238 1406 1573 1741
Decrease (-7.5% ) Heat CFM 603 680 833 986 1139 1293 1446 1599
Decrease (-15% ) Heat CFM 554 623 762 901 1040 1179 1318 1457
COOLING BLOWER PERFORMANCE
Cooling Adjust CFM
Selections
Blower Speed Selections
First Stage Cool Speed - cfm Second Stage Cool Speed - cfm
Low Medium-
Low
Medium
High
High
(Default)
Low Medium-
Low
Medium
High
High
(Default)
Increase (+10%) Cool CFM 1020 1205 1305 1480 1485 1725 1885 2070
Default Cool CFM 955 1080 1205 1360 1365 1565 1720 1905
Decrease (-10%) Cool CFM 865 980 1080 1215 1220 1390 1545 1740
The effect of static pressure is included in air volumes shown.
The following control congurations are available. See Installation Instructions for details and DIP switch settings.
Heat Modes Available (Heating Blower Performance Table):
Single stage thermostat:
- 35%, 70%, 100% input (three-stage) with time delays in-between
Two-stage thermostat:
- Variable Rate Capacity Mode - furnace automatically adjusts ring rate based on rst- and second-stage cycle times
- W1 demand at 70% input, W2 demand at 100% input. No delay between stages
icomfort Touch™ Communicating Thermostat:
- Variable Rate Capacity Mode - furnace automatically adjusts ring rate based on rst- and second-stage cycle times
- 35%, 60%, 80%, 100% (four-stage) with time delays in-between
Cool Mode Available (Cooling Blower Performance table):
First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position.
Continuous Fan speeds are approximately 28%, 38%, 70% and 100% (DIP switch selectable) of the same second-stage COOL speed position
minimum 300 cfm.
Lennox Harmony III™ Zoning System Applications - Minimum blower speed is 450 cfm.
SLP98UH135V60D BLOWER PERFORMANCE (less lter)
BOTTOM RETURN AIR
HEATING BLOWER PERFORMANCE
Heating Adjust CFM Selections Heating Input Range and Blower Volume - CFM
35% 40% 50% 60% 70% 80% 90% 100%
Increase (+15%) Heat CFM 949 1033 1200 1367 1534 1701 1868 2035
Increase (+7.5%) Heat CFM 879 957 1113 1269 1426 1582 1738 1895
Default Heat CFM 808 881 1026 1172 1317 1463 1608 1754
Decrease (-7.5% ) Heat CFM 748 817 956 1095 1235 1374 1513 1652
Decrease (-15% ) Heat CFM 687 753 886 1019 1152 1284 1417 1550
COOLING BLOWER PERFORMANCE
Cooling Adjust CFM
Selections
Blower Speed Selections
First Stage Cool Speed - cfm Second Stage Cool Speed - cfm
Low Medium-
Low
Medium
High
High
(Default)
Low Medium-
Low
Medium
High
High
(Default)
Increase (+10%) Cool CFM 1070 1260 1410 1555 1565 1750 1970 2190
Default Cool CFM 980 1115 1255 1430 1445 1615 1805 1985
Decrease (-10%) Cool CFM 865 1020 1115 1280 1290 1470 1650 1805

Page 12
BLOWER DATA
SLP98UH135V60D BLOWER PERFORMANCE (less lter)
RIGHT SIDE RETURN AIR
HEATING BLOWER PERFORMANCE
Heating Adjust CFM Selections Heating Input Range and Blower Volume - CFM
35% 40% 50% 60% 70% 80% 90% 100%
Increase (+15%) Heat CFM 927 1010 1175 1340 1505 1671 1836 2001
Increase (+7.5%) Heat CFM 844 923 1081 1239 1398 1556 1714 1873
Default Heat CFM 760 836 987 1138 1290 1441 1593 1744
Decrease (-7.5% ) Heat CFM 703 775 919 1064 1208 1352 1496 1641
Decrease (-15% ) Heat CFM 646 715 852 989 1126 1263 1400 1537
COOLING BLOWER PERFORMANCE
Cooling Adjust CFM
Selections
Blower Speed Selections
First Stage Cool Speed - cfm Second Stage Cool Speed - cfm
Low Medium-
Low
Medium
High
High
(Default)
Low Medium-
Low
Medium
High
High
(Default)
Increase (+10%) Cool CFM 1070 1235 1385 1535 1550 1720 1925 2005
Default Cool CFM 985 1110 1245 1395 1415 1605 1755 1970
Decrease (-10%) Cool CFM 870 1010 1110 1260 1280 1435 1610 1755
The effect of static pressure is included in air volumes shown.
The following control congurations are available. See Installation Instructions for details and DIP switch settings.
Heat Modes Available (Heating Blower Performance Table):
Single stage thermostat:
- 35%, 70%, 100% input (three-stage) with time delays in-between
Two-stage thermostat:
- Variable Rate Capacity Mode - furnace automatically adjusts ring rate based on rst- and second-stage cycle times
- W1 demand at 70% input, W2 demand at 100% input. No delay between stages
icomfort Touch™ Communicating Thermostat:
- Variable Rate Capacity Mode - furnace automatically adjusts ring rate based on rst- and second-stage cycle times
- 35%, 60%, 80%, 100% (four-stage) with time delays in-between
Cool Mode Available (Cooling Blower Performance table):
First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position.
Continuous Fan speeds are approximately 28%, 38%, 70% and 100% (DIP switch selectable) of the same second-stage COOL speed position
minimum 300 cfm.
Lennox Harmony III™ Zoning System Applications - Minimum blower speed is 450 cfm.
SLP98UH135V60D BLOWER PERFORMANCE (less lter)
RIGHT SIDE RETURN AIR WITH OPTIONAL RETURN AIR BASE
HEATING BLOWER PERFORMANCE
Heating Adjust CFM Selections Heating Input Range and Blower Volume - CFM
35% 40% 50% 60% 70% 80% 90% 100%
Increase (+15%) Heat CFM 909 992 1157 1322 1487 1653 1818 1983
Increase (+7.5%) Heat CFM 828 907 1065 1224 1382 1541 1699 1858
Default Heat CFM 746 822 974 1125 1277 1429 1580 1732
Decrease (-7.5% ) Heat CFM 690 761 903 1046 1188 1330 1472 1615
Decrease (-15% ) Heat CFM 634 700 833 966 1099 1231 1364 1497
COOLING BLOWER PERFORMANCE
Cooling Adjust CFM
Selections
Blower Speed Selections
First Stage Cool Speed - cfm Second Stage Cool Speed - cfm
Low Medium-
Low
Medium
High
High
(Default)
Low Medium-
Low
Medium
High
High
(Default)
Increase (+10%) Cool CFM 1060 1210 1350 1500 1535 1685 1900 2095
Default Cool CFM 960 1090 1210 1370 1380 1580 1740 1970
Decrease (-10%) Cool CFM 855 990 1090 1205 1250 1400 1585 1740

Page 13
FIGURE 1
BURNER BOX ASSEMBLY
VARIABLE
CAPACITY
GAS VALVE
HEAT EXCHANGER
ACCESS PANEL
CONTROL BOX
(includes variable capacity integrated control
transformer circuit breaker and door switch)
VARIABLE SPEED BLOWER MOTOR
BAG ASSEMBLIES
(shipping location)
COLD END HEADER
BOX
PRESSURE SWITCHES
VARIABLE SPEED
COMBUSTION AIR
INDUCER
INNER BLOWER
ACCESS PANEL
SIGHT GLASS
PRIMARY LIMIT
SLP98UHV PARTS ARRANGEMENT

Page 14
I−UNIT COMPONENTS
SLP98UHV unit components are shown in figure 1. The gas
valve, combustion air inducer and burners can be accessed
by removing the access panel. Electrical components are in
the control box (figure 2) found in the blower compartment.
SLP98UHV units are factory−equipped with a bottom return air
panel in place. The panel is designed to be field removed as
required for bottom air return. Markings are provided for side
return air and may be cut out in the field.
CAUTION
Electrostatic discharge can affect electronic com-
ponents. Take precautions during furnace instal-
lation and service to protect the furnace’s elec-
tronic controls. Precautions will help to avoid con-
trol exposure to electrostatic discharge by putting
the furnace, the control and the technician at the
same electrostatic potential. Neutralize electro-
static charge by touching hand and all tools on an
unpainted unit surface, such as the gas valve or
blower deck, before performing any service pro-
cedure.
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
A−Control Box 1
1. Control Transformer (T1)
A transformer located in the control box provides power to
the low voltage section of the unit. Transformers on all mod-
els are rated 40VA with a 120V primary and a 24V secon-
dary.
2. Interlock Switch (S51)
An interlock switch rated 14A at 125VAC is wired in series
with line voltage. When the inner blower access panel is re-
moved the unit will shut down.
FIGURE 2
CONTROL BOX SLP98UHV
SURELIGHT®
INTEGRATED
CONTROL
TRANSFORMER
CIRCUIT
BREAKER
INTERLOCK
SWITCH
3. Circuit Breaker (CB8)
A 24V circuit breaker is also located in the control box.
The switch provides overcurrent protection to the trans-
former (T1). The breaker is rated 3A at 32V. If the current
exceeds this limit the breaker will trip and all unit opera-
tion will shut down. The breaker can be manually reset by
pressing the button on the face. See figure 3.
FIGURE 3
CIRCUIT BREAKER CB8
PRESS TO RESET
WARNING
Shock hazard.
Disconnect power before servicing.
Integrated control is not field repairable. If control
is inoperable, simply replace entire control.
Can cause injury or death. Unsafe operation will re-
sult if repair is attempted.
4. Integrated Control (A92)
SLP98UHV units are equipped with the Lennox SureLight®
variable−capacity integrated control. This control can be
used with the icomfort Touchthermostat as part of a com-
municating comfort system. The control can also operate
with a conventional single or two−stage thermostat. The
system consists of an ignition / blower control (figures 4 and
5) with control pin designations in tables 1 and 2, and ignitor.
The control provides gas ignition, safety checks and indoor
blower control with variable capacity rate gas heating. The
furnace combustion air inducer, gas valve and indoor blow-
er are controlled in response to various system inputs such
as thermostat signal, pressure and limit switch signal and
flame signal. The control features a seven−segment LED
display, indicating furnace status (including indoor blower)
and error codes. The LED flashes in single digits. For exam-
ple using table 14 under LIMIT CODE, an E" followed by 2"
followed by 5" followed by 0", the limit switch circuit is
open. The control also has two 120 volt accessory terminals
(used for a humidifier and electronic air cleaner) rated at (1)
one amp each.

Page 15
Electronic Ignition
At the beginning of the heat cycle the SureLight®integrated
control monitors the low fire combustion air inducer pres-
sure switch. The control will not begin the heating cycle if the
low fire pressure switch is closed (by−passed). Likewise the
control will not begin the high fire heating cycle if the high fire
pressure switch is closed, and will remain in low fire heat.
However, if the high fire pressure switch closes during the
low fire heat pre−purge, the control will allow high fire heat.
Once the low fire pressure switch is determined to be open,
the combustion air inducer is energized on ignition speed.
When the differential in the pressure switch is great enough,
the pressure switch closes and a 15−second pre−purge be-
gins. If the switch is not proven within 2−1/2 minutes, the in-
ducer is de−energized and the control will initiate vent cal-
ibration. If the vent calibration is unsuccessful the control
goes into a 5 minute delay. The control will attempt vent cal-
ibration 3 more times before going into a 1 hour soft lockout.
After the 15 second pre−purge period the SureLight ignitor
warms up for 20 seconds. The gas valve then opens for a
4−second trial for ignition. The ignitor stays energized during
this trial until flame is sensed. If ignition is not proven during
the 4−second trial for ignition, the control will try four more
times with an inter purge and warm−up time between trials of
35 seconds. After a total of five trials for ignition (including
the initial trial), the control goes into Watchguard−Flame
Failure mode. After a 60−minute reset period, the control will
begin the ignition sequence again.
Thermostat Selection Modes
See table 3 for DIP switch settings
The control can be made to operate in three modes: vari-
able capacity, three−stage timed or two−stage. The variable
capacity and two−stage modes are only operational with a
two−stage thermostat. The thermostat selection is made us-
ing dip switches one and / or two (figure 4) and must be
positioned for the particular application.
Variable Capacity
Using a two−stage thermostat the system will operate in a
variable capacity sequence mode. In this mode, the control
will vary the firing rate anywhere between 35% and 100% of
full capacity. The indoor blower will be automatically ad-
justed accordingly to provide the appropriate airflow at any
rate. On the initial call for low fire, the furnace will operate at
35% and will remain there until the heat call is satisfied or a
call for high fire is initiated. If there is a call for high fire the
rate will increase by 10% if the current rate is above 60%.
However, if the current rate is below 60% the rate will in-
crease to 70%. After this initial rate increase to 70% capac-
ity, the furnace will increase rate by 10% every 5 minutes
while a high fire heat call is present. If the high fire heat call is
satisfied but the low fire heat call is still present, the furnace
will remain at the current firing rate until the demand is satis-
fied or another call for high fire is initiated.
Three−Stage Timed Operation
Using a single−stage thermostat the system will operate in a
three stage timed mode. Upon a call for heat and a success-
ful ignition, the combustion air inducer will operate at 35%
and the indoor blower will adjust to the appropriate cfm. Af-
ter a field selectable 7 or 12 minute delay period, the induc-
er RPM will increase and the unit will operate at 70%. The
indoor blower will adjust to the appropriate cfm. After a fac-
tory set non−adjustable 10 minute delay expires the furnace
will increase rate to 100%. The indoor blower will adjust to
the appropriate cfm.
Two−Stage Operation
The system will also operate in conventional two−stage
mode. While in two−stage mode, the furnace will fire on low
fire (70% rate). The combustion air inducer will operate at
70% and the indoor blower will adjust to the appropriate
cfm. The unit will switch to high fire on a W2 call from the
thermostat. After a 30 second recognition period (during
which the integrated control will receive a continuous W2
call) expires the furnace will increase to 100% rate. The in-
ducer will increase to 100% speed and the indoor blower will
adjust to appropriate cfm. If there is a simultaneous call for
first and second stage heat, the unit will fire on first stage
heat and switch to second stage heat after 30 seconds of
operation.
TABLE 1
SureLight®Control 6 Pin Terminal Designation
PIN # Function
1Data Input From Motor
2 Common
3Not Used
4Data Output To Motor
55 Volt Bias Supply
6Not Used
TABLE 2
SureLight Control 12 Pin Terminal Designation
PIN # Function
1Not used
2High Fire Pressure Switch
3Rollout In
4 Ground
524V Hot
6Primary Limit In
7Gas Valve
8Gas Valve Common
924V Neutral
10 Ground
11 Primary Limit Switch Out
12 Low Fire Pressure Switch

Page 16
FIGURE 4
THERMOSTAT CONNECTIONS (TB1)
1/4" QUICK CONNECT TERMINALS
RS−BUS LINK (TB82, future use)
I+ = DATA HIGH CONNECTION
I − = DATA LOW CONNECTION
RS−BUS OUTDOOR (TB83)
R = 24VAC
I + = DATA HIGH CONNECTION
I − = DATA LOW CONNECTION
C = 24VAXC COMMON
RS−BUS INDOOR (TB84)
R = 24VAC
I + = DATA HIGH CONNECTION
I − = DATA LOW CONNECTION
C = 24VAXC COMMON
+
FLAME
SENSE
COMBUSTION
AIR INDUCER
CONNECTOR
DIP SWITCHES
OUTDOOR AIR
SENSOR
TERMINALS
DISCHARGE AIR
SENSOR
TERMINALS
W915
W951
W914
ON−BOARD
LINKS
INDOOR
BLOWER
CONNECTOR
EAC
HUM
LINE VOLTAGE
TERMINALS
NEUTRAL
TERMINALS
IGNITOR
CONNECTOR
7−SEGMENT
DIAGNOSTIC LED
DIAGNOSTIC
PUSH BUTTON
FACTORY TEST
HEADER PINS.
FACTORY USE ONLY.
TB83 OUTDOOR
TB84 INDOOR
DS = DEHUMIDIFICATION SIGNAL
W2 = HEAT DEMAND FROM 2ND STAGE T/STAT
W1 = HEAT DEMAND FROM 1ST STAGE T/STAT
R = CLASS 2 VOLTAGE TO THERMOSTAT
G = MANUAL FAN FROM T’STAT
C = THERMOSTAT SIGNAL GROUND CONNECTED
TO TRANSFORMER GRD (TR) & CHASIS GROUND
(GRD)
Y1 = THERMOSTAT 1ST STAGE COOL SIGNAL
Y2 = THERMOSTAT 2ND STAGE COOL SIGNAL
O = THERMOSTAT SIGNAL TO HEAT PUMP
REVERSING VALVE
H = 24V HUMIDIFIER OUTPUT. DO NOT CONNECT
TO COMFORTSENSE®THERMOSTAT
L = USE ONLY WITH A COMMUNICATING
THERMOSTAT AND A NON−COMMU-
NICATING OUTDOOR UNIT
DH = DEHUMIDIFICATION OUTPUT
COMMUNICATING THERMOSTAT
ONLY
HUM = 120 VAC OUTPUT TO HUMIDIFIER
XMFR = 120 VAC OUTPUT TO TRANSFORMER
LI = 120 VAC INPUT TO CONTROL
CIRC = 120 VAC OUTPUT TO CIRCULATING BLOWER
EAC = 120 VAC OUTPUT TO ELECTRICAL AIR CLEANER
NEUTRALS = 120 VAC NEUTRAL
L − use only with
communicating T’stat and
non−communicating outdoor
unit.
W915 Y1 TO Y2
W951 R TO O
W914 R TO DS

Page 17
FIGURE 5
SLP98UHV INTEGRATED CONTROL CONFIGURATION GUIDE

Page 18
TABLE 3
Thermostat Selection Switch Settings
Operation Thermostat Switch 1 Switch 2 Switch 3
Variable Capacity Heat
(35% to 100%)
Two−Stage Off On Off
Three−Stage Heat
(35%, 70%, 100%)
Single−Stage On Off 2nd stage delay
OFF = 7 minutes
ON = 12 minutes
3rd stage delay
10 minutes fixed
Two−Stage Heat (W1 70%, W2 100%) Two−Stage Off Off Off
NOTE − When the SLP98UHV is used with an icomfort
Touchtcommunicating thermostat, all indoor blower
speed selections and DIP switch settings are made by
the communicating thermostat.
Heating Operation DIP Switch Settings −− Figure 4
Switch 1 −− Thermostat Selection −− This unit may be used
with either a single−stage or two−stage thermostat. The ther-
mostat selection is made using a DIP switch which must be
properly positioned for the particular application. The DIP
switch is factory−positioned for use with a two−stage thermo-
stat. If a single−stage thermostat is to be used, the DIP
switch must be repositioned. See table 3.
NOTE − All DIP switches are factory shipped in the
OFF" position.
Switch 2 −− Operating Mode with Two−Stage Thermostat
−− If a two−stage thermostat is used, the furnace can operate
in either variable−capacity or conventional two−stage mode.
When variable−capacity mode is selected, the firing rate of
the unit is varied to maximize comfort. Conventional two−
stage mode is the factory default setting. See table 3.
Switch 3 −− Second−Stage Heat On Delay −− If a single−
stage thermostat is used, the integrated control can be used
to energize second−stage heat after either 7 minutes or 12
minutes of first−stage heat operation. See table 3.
Switches 4 and 5 −− Blower−Off Delay −− The blower−on
delay of 45 seconds is not adjustable. The blower−off delay
(time that the blower operates after the heating demand has
been satisfied) can be adjusted by moving switches 4 and 5
on the integrated control. The unit is shipped from the facto-
ry with a blower−off delay of 90 seconds. The blower off
delay affects comfort and is adjustable to satisfy individual
applications. Adjust the blower off delay to achieve a supply
air temperature between 90° and 110°F at the exact mo-
ment that the blower is de−energized. Longer off delay set-
tings provide lower supply air temperatures; shorter set-
tings provide higher supply air temperatures. Table 4 pro-
vides the blower off timings that will result from different
switch settings.
TABLE 4
Blower Off Delay Switch Settings
Blower Off Delay
(Seconds) Switch 4 Switch 5
60 Off On
90 (factory) Off Off
120 On Off
180 On On
Indoor Blower Operation DIP Switch Settings
Switches 6 and 7 −− Continuous Indoor Fan Operation −−
Blower Speed − Switches 6 and 7 are used to select blower
motor speeds during continuous indoor blower operation.
The unit is shipped from the factory with DIP switches posi-
tioned for medium low (2) speed during continuous indoor
blower operation. The table below provides the continuous
blower speeds that will result from various switch settings.
Refer to blower tables at the front of this manual for corre-
sponding cfm values.
TABLE 5
Continuous Indoor Fan
Speed Switch 6 Switch 7
1 − Low (28%) Off On
2 − Medium Low
(38%)
(Factory) Off Off
3 − Medium High
(70%) On Off
4 − High (100%) On On
Switches 8 and 9 −− Cooling Mode Blower Speed −−
Switches 8 and 9 are used to select cooling blower motor
speed. The unit is shipped from the factory with the DIP
switches positioned for high speed (4) indoor blower motor
operation during the cooling mode. The table below pro-
vides the cooling mode blower speeds that will result from
different switch settings. Refer to blower tables at the front
of this manual for corresponding cfm values.
TABLE 6
Cooling Mode Blower Speeds
Speed Switch 8 Switch 9
1 − Low On On
2 − Medium Low Off On
3 − Medium High On Off
4 − High (Factory) Off Off

Page 19
Switches 10 and 11 −− Cooling Mode Blower Speed Ad-
justment −− Switches 10 and 11 are used to select blower
speed adjustment settings. The unit is shipped from the fac-
tory with the DIP switches positioned for NORMAL (no) ad-
justment. The DIP switches may be positioned to adjust the
blower speed by +10% or −10% to better suit the application.
The table below provides blower speed adjustments that
will result from different switch settings. Refer to blower
tables at the front of this manual for corresponding cfm val-
ues. With switches 10 and 11 set to ON, motor will bypass
ramping profiles and all delays and immediately upon a call
for cool, run at COOLING speed selected. LED will continue
to operate as normal. This mode is used to check motor op-
eration.
TABLE 7
Blower Speed Adjustment
Adjustment Switch 10 Switch 11
+10% (approx.) On Off
NORMAL (Factory) Off Off
−10% (approx.) Off On
MOTOR TEST On On
Switches 12 and 13 −− Cooling Mode Blower Speed
Ramping −− Switches 12 and 13 are used to select cooling
mode blower speed ramping options. Blower speed ramp-
ing may be used to enhance dehumidification performance.
The switches are factory set at option A which has the great-
est effect on blower motor performance. Table 8 provides
the cooling mode blower speed ramping options that will re-
sult from different switch settings. The cooling mode blower
speed ramping options are detailed below.
TABLE 8
Cooling Mode Blower Speed Ramping
Ramping Option Switch 12 Switch 13
A (Factory) Off Off
B On Off
C Off On
D On On
Ramping Option A (Factory Selection)
Motor runs at 50% for 30 seconds.
Motor then runs at 82% for approximately 7−1/2 min-
utes.
If demand has not been satisfied after 7−1/2 minutes,
motor runs at 100% until demand is satisfied.
Once demand is met, motor runs at 50% for 30 sec-
onds then ramps down to stop.
OFF
OFF
1/2 MIN
50% CFM
COOLING DEMAND
7 1/2 MIN
82% CFM
100%
CFM
1/2 MIN
50% CFM
Ramping Option B
Motor runs at 82% for approximately 7−1/2 minutes. If
demand has not been satisfied after 7−1/2 minutes, mo-
tor runs at 100% until demand is satisfied.
Once demand is met, motor ramps down to stop.
OFF
OFF 82%CFM 100% CFM
COOLING DEMAND
7 1/2 MIN
Ramping Option C
Motor runs at 100% until demand is satisfied.
Once demand is met, motor runs at 100% for 45 sec-
onds then ramps down to stop.
OFF
OFF 100% CFM 100% CFM
DEMAND 45 SEC.
Ramping Option D
Motor runs at 100% until demand is satisfied.
Once demand is met, motor ramps down to stop.
OFFOFF 100% CFM
COOLING
DEMAND

Page 20
TABLE 9
Low Heat Blower Speeds
Thermostat
Demand
Blower
Speed
Adjust-
ments
DIP SWITCH SETTINGS
14 15 16
Low Heat
(R to W1)
+15% On Off On
+7.5% On Off Off
Normal Off Off Off
−7.5% On On Off
−15% On On On
Switches 14 through19 −− Heating Mode Blower Speed −−
Switches 14 through 19 are used to select heating mode
blower motor speeds. These switches are factory set at the
OFF position which provides 100 % of normal speed during
HIGH HEAT demand, 70% of normal speed during MID−
RANGE HEAT demand and 40% of normal speed during
LOW HEAT demand. Switches 14, 15 and 16 are used to
adjust the LOW FIRE blower motor speed. Switches 17, 18
and 19 are used to adjust the HIGH FIRE blower motor
speed. Figure 6 and tables 9 and 10 provides the heating
mode blower speeds that will result from different switch
settings. Figure 6 indicates the effect the DIP switch set-
tings (tables 20 &21 above) have upon the heating airflow at
various furnace firing rates.
Refer to blower tables at the front of this manual for corre-
sponding cfm values.
TABLE 10
High Heat Blower Speeds
Thermostat
Demand
Blower
Speed
Adjust-
ments
DIP SWITCH SETTINGS
17 18 19
High Heat
(R to
W1 & W2)
+15% On Off On
+7.5% On Off Off
Normal Off Off Off
−7.5% On On Off
−15% On On On
Low Fire
Dip Switches
14, 15, 16
High Fire
Dip Switches
17, 18, 19
Airflow Determination
Identify blower speed adjustment points at low and high fire
Airflow will lie on straight line between these two points and will fall within
the shaded area as shown
EXAMPLE −7.5% at low fire +7.5% at high fire
35% 50% 60% 70% 80% 90% 100%
RATE (%)
+15%
+7.5%
−7.5%
−15%
Nominal
−15%
Nominal
−7.5%
+7.5%
+15%
Increasing
Airflow
FIGURE 6