Lennox SLP98UHV SERIES, SLP98UH070V36B, SLP98UH090V36C, SLP98UH090V48C, SLP98UH090V60C Unit Information

...

Service Literature

Corp. 1029−L7

SLP98UHV SERIES UNITS

SLP98UHV series units are high−efficiency upflow, horizontal right and left) gas furnaces equipped with variable capacity gas valve, variable speed combustion air inducer and variable speed indoor blower motor. All models are designed 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 applications from 2 to 5 tons (7.0 kW to 17.5 kW). Refer to Engineering 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 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.

variable capacity integrated control

SLP98UHV

All specifications in this manual are subject to change. Procedures outlined in this manual are presented as recommendations 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 constitute 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, personal 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 disconnect 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 1

SPECIFICATIONS

Gas Heating Performance

Maximum Input - Btuh 66,000 88,000 88,000

Temperature rise range - °F 50 - 80 60 - 90 50 - 80

Gas Manifold Pressure (in. w.g.)

Nat. Gas / LPG/Propane

Minimum Input - Btuh 23,000 31,000 31,000

Temperature rise range - °F 35 - 65 35 - 65 35 - 65

Gas Manifold Pressure (in. w.g.)

Nat. Gas / LPG/Propane

High static - in. w.g. 0.8 0.8 0.8

Connections in.

Condensate Drain Trap (PVC pipe) - i.d. 1/2 1/2 1/2

Intake / Exhaust Pipe (PVC) 2 / 2 2 / 2 2 / 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

Wheel nominal diameter x width - in. 10 x 9 10 x 9 11 x 11

Blower

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.

Annual Fuel Utilization Efciency based on DOE test procedures and according to FTC labeling regulations. Isolated combustion system rating for non-weatherized

furnaces.

Model No. SLP98UH070V36B SLP98UH090V36C SLP98UH090V48C

AFUE 97.0% 98.0% 97.5%

Output - Btuh 64,000 85,000 85,000

3.5 / 10.0 3.5 / 10.0 3.5 / 10.0

Output - Btuh 22,000 30,000 30,000

0.5 / 1.5 0.5 / 1.5 0.5 / 1.5

Motor output - hp 1/2 1/2 3/4

SPECIFICATIONS

Gas Heating Performance

Maximum Input - Btuh 88,000 110,000 132,000

Temperature rise range - °F 50 - 80 50 - 80 55 - 85

Gas Manifold Pressure (in. w.g.)

Nat. Gas / LPG/Propane

Minimum Input - Btuh 31,000 39,000 46,000

Temperature rise range - °F 35 - 65 35 - 65 35 - 65

Gas Manifold Pressure (in. w.g.)

Nat. Gas / LPG/Propane

High static - in. w.g. 0.8 0.8 0.8

Connections in.

Condensate Drain Trap (PVC pipe) - i.d. 1/2 1/2 1/2

Intake / Exhaust Pipe (PVC) 2 / 2 2 / 2 2 / 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

Wheel nominal diameter x width - in. 11 x 11 11 x 11 11 x 11

Blower

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.

Annual Fuel Utilization Efciency based on DOE test procedures and according to FTC labeling regulations. Isolated combustion system rating for non-weatherized

furnaces.

Model No. SLP98UH090V60C SLP98UH110V60C SLP98UH135V60D

AFUE 98.2% 97.5% 97.5%

Output - Btuh 85,000 106,000 126,000

3.5 / 10.0 3.5 / 10.0 3.5 / 10.0

Output - Btuh 30,000 38,000 45,000

0.5 / 1.5 0.5 / 1.5 0.5 / 1.5

Motor output - hp 1 1 1

Page 2

OPTIONAL ACCESSORIES - MUST BE ORDERED EXTRA

“B” 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

Remote Outdoor Temperature Sensor

X2658 X2658 X2658

(for dual fuel and Humiditrol®)

Discharge Temperature Sensor 88K38 88K38 88K38

ComfortSense

Remote Outdoor Temperature Sensor

7000 Thermostat Y2081 Y2081 Y2081

X2658 X2658 X2658

(for dual fuel and Humiditrol)

FILTER KITS

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

Wall - Close

Couple WTK

Roof 2 in. 15F75 15F75 - - -

Wall Ring Kit 2 in. 15F74 15F74 - - -

Roof Termination Flashing Kit (2 ashings) 2 in. 44J41 44J41 44J41

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.

Optional for service diagnostics.

Remote Outdoor Temperature Sensor for ComfortSense 7000 Thermostat must be connected directly to the thermostat, Do not connect it to the icomfort™ control board.

Cleanable polyurethane frame type lter.

NOTE - Termination Kits 44W92, 44W93, 30G28, 81J20 are certied to ULC S636 standard for use in Canada only.

US - 2 in. 22G44 - - - - - -

3 in. 44J40 44J40 44J40

Canada - 2 in. 30G28 - - - - - -

3 in. 81J20 81J20 81J20

“C” Width

Models

“D” Width

Models

Input High Altitude

Pressure Switch Kit

7501 - 10,000 ft. 0 - 10,000 ft. 0 - 10,000 ft.

All models 73W89 65W77 70W87

GAS HEAT ACCESSORIES

Natural Gas to

LPG/Propane Kit

Page 3

LPG/Propane to

Natural Gas Kit

BLOWER DATA

SLP98UH070V36B BLOWER PERFORMANCE (less lter)

BOTTOM RETURN AIR

HEATING BLOWER PERFORMANCE

Heating Adjust CFM Selections

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

First Stage Cool Speed - cfm Second Stage Cool Speed - cfm

Low Medium-

Low

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

Heating Input Range and Blower Volume - CFM

Blower Speed Selections

Medium

High

(Default)

Low Medium-

Low

Medium

High

(Default)

SLP98UH070V36B BLOWER PERFORMANCE (less lter)

RIGHT SIDE RETURN AIR

HEATING BLOWER PERFORMANCE

Heating Adjust CFM Selections

35% 40% 50% 60% 70% 80% 90% 100%

Heating Input Range and Blower Volume - CFM

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

First Stage Cool Speed - cfm Second Stage Cool Speed - cfm

Low Medium-

Low

Medium

High

Blower Speed Selections

High

Low Medium-

(Default)

Low

Medium

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

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.

Page 4

BLOWER DATA

SLP98UH070V36B BLOWER PERFORMANCE (less lter)

RIGHT SIDE RETURN AIR WITH OPTIONAL RETURN AIR BASE

HEATING BLOWER PERFORMANCE

Heating Adjust CFM Selections

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

First Stage Cool Speed - cfm Second Stage Cool Speed - cfm

Low Medium-

Low

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

Heating Input Range and Blower Volume - CFM

Blower Speed Selections

Medium

High

(Default)

Low Medium-

Low

Medium

High

(Default)

SLP98UH090V36C BLOWER PERFORMANCE (less lter)

BOTTOM RETURN AIR

HEATING BLOWER PERFORMANCE

Heating Adjust CFM Selections

35% 40% 50% 60% 70% 80% 90% 100%

Heating Input Range and Blower Volume - CFM

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

First Stage Cool Speed - cfm Second Stage Cool Speed - cfm

Low Medium-

Low

Medium

High

Blower Speed Selections

High

Low Medium-

(Default)

Low

Medium

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

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):

Lennox Harmony III™ Zoning System Applications - Minimum blower speed is 250 cfm.

Page 5

BLOWER DATA

SLP98UH090V36C BLOWER PERFORMANCE (less lter)

RIGHT SIDE RETURN AIR

HEATING BLOWER PERFORMANCE

Heating Adjust CFM Selections

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

First Stage Cool Speed - cfm Second Stage Cool Speed - cfm

Low Medium-

Low

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

Heating Input Range and Blower Volume - CFM

Blower Speed Selections

Medium

High

(Default)

Low Medium-

Low

Medium

High

(Default)

SLP98UH090V36C BLOWER PERFORMANCE (less lter)

RIGHT SIDE RETURN AIR WITH OPTIONAL RETURN AIR BASE

HEATING BLOWER PERFORMANCE

Heating Adjust CFM Selections

35% 40% 50% 60% 70% 80% 90% 100%

Heating Input Range and Blower Volume - CFM

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

First Stage Cool Speed - cfm Second Stage Cool Speed - cfm

Low Medium-

Low

Medium

High

Blower Speed Selections

High

Low Medium-

(Default)

Low

Medium

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

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):

Lennox Harmony III™ Zoning System Applications - Minimum blower speed is 250 cfm.

Page 6

BLOWER DATA

SLP98UH090V48C BLOWER PERFORMANCE (less lter)

BOTTOM RETURN AIR

HEATING BLOWER PERFORMANCE

Heating Adjust CFM Selections

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

First Stage Cool Speed - cfm Second Stage Cool Speed - cfm

Low Medium-

Low

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

Heating Input Range and Blower Volume - CFM

Blower Speed Selections

Medium

High

(Default)

Low Medium-

Low

Medium

High

(Default)

SLP98UH090V48C BLOWER PERFORMANCE (less lter)

RIGHT SIDE RETURN AIR

HEATING BLOWER PERFORMANCE

Heating Adjust CFM Selections

35% 40% 50% 60% 70% 80% 90% 100%

Heating Input Range and Blower Volume - CFM

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

First Stage Cool Speed - cfm Second Stage Cool Speed - cfm

Low Medium-

Low

Medium

High

Blower Speed Selections

High

Low Medium-

(Default)

Low

Medium

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

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):

Lennox Harmony III™ Zoning System Applications - Minimum blower speed is 380 cfm.

Page 7

BLOWER DATA

SLP98UH090V48C BLOWER PERFORMANCE (less lter)

RIGHT SIDE RETURN AIR WITH OPTIONAL RETURN AIR BASE

HEATING BLOWER PERFORMANCE

Heating Adjust CFM Selections

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

First Stage Cool Speed - cfm Second Stage Cool Speed - cfm

Low Medium-

Low

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

Heating Input Range and Blower Volume - CFM

Blower Speed Selections

Medium

High

(Default)

Low Medium-

Low

Medium

High

(Default)

SLP98UH090V60C BLOWER PERFORMANCE (less lter)

BOTTOM RETURN AIR

HEATING BLOWER PERFORMANCE

Heating Adjust CFM Selections

35% 40% 50% 60% 70% 80% 90% 100%

Heating Input Range and Blower Volume - CFM

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

First Stage Cool Speed - cfm Second Stage Cool Speed - cfm

Low Medium-

Low

Medium

High

Blower Speed Selections

High

Low Medium-

(Default)

Low

Medium

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

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):

Lennox Harmony III™ Zoning System Applications - Minimum blower speed is 380 cfm (SLP98UH090V48C) and 450 cfm (SLP98UH090V60C).

Page 8

BLOWER DATA

SLP98UH090V60C BLOWER PERFORMANCE (less lter)

RIGHT SIDE RETURN AIR

HEATING BLOWER PERFORMANCE

Heating Adjust CFM Selections

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

First Stage Cool Speed - cfm Second Stage Cool Speed - cfm

Low Medium-

Low

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

Heating Input Range and Blower Volume - CFM

Blower Speed Selections

Medium

High

(Default)

Low Medium-

Low

Medium

High

(Default)

SLP98UH090V60C BLOWER PERFORMANCE (less lter)

RIGHT SIDE RETURN AIR WITH OPTIONAL RETURN AIR BASE

HEATING BLOWER PERFORMANCE

Heating Adjust CFM Selections

35% 40% 50% 60% 70% 80% 90% 100%

Heating Input Range and Blower Volume - CFM

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

First Stage Cool Speed - cfm Second Stage Cool Speed - cfm

Low Medium-

Low

Medium

High

Blower Speed Selections

High

Low Medium-

(Default)

Low

Medium

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

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):

Lennox Harmony III™ Zoning System Applications - Minimum blower speed is 450 cfm.

Page 9

BLOWER DATA

SLP98UH110V60C BLOWER PERFORMANCE (less lter)

BOTTOM RETURN AIR

HEATING BLOWER PERFORMANCE

Heating Adjust CFM Selections

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

First Stage Cool Speed - cfm Second Stage Cool Speed - cfm

Low Medium-

Low

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

Heating Input Range and Blower Volume - CFM

Blower Speed Selections

Medium

High

(Default)

Low Medium-

Low

Medium

High

(Default)

SLP98UH110V60C BLOWER PERFORMANCE (less lter)

RIGHT SIDE RETURN AIR

HEATING BLOWER PERFORMANCE

Heating Adjust CFM Selections

35% 40% 50% 60% 70% 80% 90% 100%

Heating Input Range and Blower Volume - CFM

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

First Stage Cool Speed - cfm Second Stage Cool Speed - cfm

Low Medium-

Low

Medium

High

Blower Speed Selections

High

Low Medium-

(Default)

Low

Medium

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

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):

Lennox Harmony III™ Zoning System Applications - Minimum blower speed is 450 cfm.

Page 10

BLOWER DATA

SLP98UH110V60C BLOWER PERFORMANCE (less lter)

RIGHT SIDE RETURN AIR WITH OPTIONAL RETURN AIR BASE

HEATING BLOWER PERFORMANCE

Heating Adjust CFM Selections

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

First Stage Cool Speed - cfm Second Stage Cool Speed - cfm

Low Medium-

Low

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

Heating Input Range and Blower Volume - CFM

Blower Speed Selections

Medium

High

(Default)

Low Medium-

Low

Medium

High

(Default)

SLP98UH135V60D BLOWER PERFORMANCE (less lter)

BOTTOM RETURN AIR

HEATING BLOWER PERFORMANCE

Heating Adjust CFM Selections

35% 40% 50% 60% 70% 80% 90% 100%

Heating Input Range and Blower Volume - CFM

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

First Stage Cool Speed - cfm Second Stage Cool Speed - cfm

Low Medium-

Low

Medium

High

Blower Speed Selections

High

Low Medium-

(Default)

Low

Medium

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

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):

Lennox Harmony III™ Zoning System Applications - Minimum blower speed is 450 cfm.

Page 11

BLOWER DATA

SLP98UH135V60D BLOWER PERFORMANCE (less lter)

RIGHT SIDE RETURN AIR

HEATING BLOWER PERFORMANCE

Heating Adjust CFM Selections

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

First Stage Cool Speed - cfm Second Stage Cool Speed - cfm

Low Medium-

Low

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

Heating Input Range and Blower Volume - CFM

Blower Speed Selections

Medium

High

(Default)

Low Medium-

Low

Medium

High

(Default)

SLP98UH135V60D BLOWER PERFORMANCE (less lter)

RIGHT SIDE RETURN AIR WITH OPTIONAL RETURN AIR BASE

HEATING BLOWER PERFORMANCE

Heating Adjust CFM Selections

35% 40% 50% 60% 70% 80% 90% 100%

Heating Input Range and Blower Volume - CFM

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

First Stage Cool Speed - cfm Second Stage Cool Speed - cfm

Low Medium-

Low

Medium

High

Blower Speed Selections

High

Low Medium-

(Default)

Low

Medium

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

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):

Lennox Harmony III™ Zoning System Applications - Minimum blower speed is 450 cfm.

Page 12

BURNER BOX ASSEMBLY

SLP98UHV PARTS ARRANGEMENT

PRESSURE SWITCHES

VARIABLE CAPACITY GAS VALVE

VARIABLE SPEED

COMBUSTION AIR

INDUCER

HEAT EXCHANGER

PRIMARY LIMIT

BAG ASSEMBLIES

(shipping location)

COLD END HEADER

BOX

ACCESS PANEL

SIGHT GLASS

INNER BLOWER ACCESS PANEL

VARIABLE SPEED BLOWER MOTOR

CONTROL BOX

(includes variable capacity integrated control

transformer circuit breaker and door switch)

FIGURE 1

Page 13

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.

ELECTROSTATIC DISCHARGE (ESD)

Precautions and Procedures

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.

CIRCUIT BREAKER CB8

CAUTION

Electrostatic discharge can affect electronic components. Take precautions during furnace installation and service to protect the furnace’s electronic controls. Precautions will help to avoid control exposure to electrostatic discharge by putting the furnace, the control and the technician at the same electrostatic potential. Neutralize electrostatic charge by touching hand and all tools on an unpainted unit surface, such as the gas valve or blower deck, before performing any service procedure.

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 models are rated 40VA with a 120V primary and a 24V secondary.

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 removed the unit will shut down.

CONTROL BOX SLP98UHV

TRANSFORMER

CIRCUIT BREAKER

INTERLOCK

SWITCH

SURELIGHT® INTEGRATED

CONTROL

FIGURE 2

PRESS TO RESET

FIGURE 3

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 result 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 14

Electronic Ignition

At the beginning of the heat cycle the SureLight® integrated control monitors the low fire combustion air inducer pressure 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 begins. If the switch is not proven within 2−1/2 minutes, the inducer is de−energized and the control will initiate vent calibration. If the vent calibration is unsuccessful the control goes into a 5 minute delay. The control will attempt vent calibration 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: variable 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 using dip switches one and / or two (figure 4) and must be positioned for the particular application.

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 successful ignition, the combustion air inducer will operate at 35% and the indoor blower will adjust to the appropriate cfm. After a field selectable 7 or 12 minute delay period, the inducer RPM will increase and the unit will operate at 70%. The indoor blower will adjust to the appropriate cfm. After a factory 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 inducer 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

1 Data Input From Motor

2 Common

3 Not Used

4 Data Output To Motor

5 5 Volt Bias Supply

6 Not Used

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 adjusted 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 increase to 70%. After this initial rate increase to 70% capacity, 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 satisfied or another call for high fire is initiated.

TABLE 2

SureLight Control 12 Pin Terminal Designation

PIN # Function

1 Not used

2 High Fire Pressure Switch

3 Rollout In

4 Ground

5 24V Hot

6 Primary Limit In

7 Gas Valve

8 Gas Valve Common

9 24V Neutral

10 Ground

11 Primary Limit Switch Out

12 Low Fire Pressure Switch

Page 15

COMBUSTION

AIR INDUCER CONNECTOR

FLAME SENSE

DIAGNOSTIC

PUSH BUTTON

DIP SWITCHES

NEUTRAL

TERMINALS

IGNITOR

CONNECTOR

LINE VOLTAGE

HUM

EAC

TERMINALS

ON−BOARD

LINKS

OUTDOOR AIR

SENSOR

TERMINALS

DISCHARGE AIR

SENSOR

FACTORY TEST

HEADER PINS.

FACTORY USE ONLY.

TB83 OUTDOOR

TERMINALS

TB84 INDOOR

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

7−SEGMENT

DIAGNOSTIC LED

INDOOR

BLOWER

CONNECTOR

W915 Y1 TO Y2

W951 R TO O

W915

W951

W914

W914 R TO DS

L − use only with

communicating T’stat and

non−communicating outdoor

unit.

THERMOSTAT CONNECTIONS (TB1)

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

Y1 = THERMOSTAT 1ST STAGE COOL SIGNAL

(GRD)

1/4" QUICK CONNECT TERMINALS

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

FIGURE 4

Page 16

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

SLP98UHV INTEGRATED CONTROL CONFIGURATION GUIDE

FIGURE 5

Page 17

Thermostat Selection Switch Settings

TABLE 3

Operation Thermostat Switch 1 Switch 2 Switch 3

Variable Capacity Heat

Two−Stage Off On Off

(35% to 100%)

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 Toucht communicating 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 thermostat 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 thermostat. 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 factory 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 moment that the blower is de−energized. Longer off delay settings provide lower supply air temperatures; shorter settings provide higher supply air temperatures. Table 4 provides the blower off timings that will result from different switch settings.

Blower Off Delay Switch Settings

TABLE 4

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 positioned 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 corresponding cfm values.

TABLE 5

Continuous Indoor Fan

Speed Switch 6 Switch 7

1 − Low (28%) Off On

2 − Medium Low

(38%)

Off Off

(Factory)

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 provides 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 18

Switches 10 and 11 −− Cooling Mode Blower Speed Adjustment −− Switches 10 and 11 are used to select blower

speed adjustment settings. The unit is shipped from the factory with the DIP switches positioned for NORMAL (no) adjustment. 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 values. 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 operation.

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

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

1/2 MIN 50% CFM

7 1/2 MIN 82% CFM

COOLING DEMAND

100% CFM

1/2 MIN 50% CFM

OFF

Ramping Option B

 Motor runs at 82% for approximately 7−1/2 minutes. If

demand has not been satisfied after 7−1/2 minutes, motor runs at 100% until demand is satisfied.

 Once demand is met, motor ramps down to stop.

OFF

7 1/2 MIN

82%CFM

COOLING DEMAND

100% CFM

OFF

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 ramping may be used to enhance dehumidification performance. The switches are factory set at option A which has the greatest effect on blower motor performance. Table 8 provides the cooling mode blower speed ramping options that will result 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 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

100% CFM

DEMAND

100% CFM

45 SEC.

OFF

Ramping Option D

 Motor runs at 100% until demand is satisfied.

 Once demand is met, motor ramps down to stop.

100% CFM

COOLING DEMAND

OFFOFF

Page 19

Low Heat Blower Speeds

TABLE 9

Thermostat

Demand

Blower

Speed

Adjust-

ments

DIP SWITCH SETTINGS

14 15 16

+15% On Off On

Low Heat (R to W1)

+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 settings (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 corresponding cfm values.

Thermostat

Demand

High Heat

(R to

W1 & W2)

High Heat Blower Speeds

TABLE 10

Blower

Speed

Adjust-

ments

DIP SWITCH SETTINGS

17 18 19

+15% On Off On

+7.5% On Off Off

Normal

Off Off Off

−7.5% On On Off

−15% On On On

Increasing

Airflow

+15%

+7.5%

Nominal

−7.5%

−15%

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

Low Fire

Dip Switches

14, 15, 16

35%

50%

60%

70%

RATE (%)

FIGURE 6

80%

90%

High Fire

Dip Switches

17, 18, 19

+15%

+7.5%

Nominal

−7.5%

−15%

100%

Page 20

On−Board Link W914 DS to R (Figure 4)

On−board link W914, is a clippable connection between terminals DS and R on the integrated control. W914 must be cut when the furnace is installed with either the Harmony III zone control or a thermostat which features humidity control. If the link is left intact the PWM signal from the Harmony III control will be blocked and also lead to control damage. Refer to table 15 for operation sequence in applications including SLP98UHV, a thermostat which features humidity control and a single−speed outdoor unit. Table 16 gives the operation sequence in applications with a two− speed outdoor unit.

On−Board Link W951 R to O (Figure 4)

On−board link W951 is a clippable connection between terminals R and O on the integrated control. W951 must be cut when the furnace is installed in applications which include a heat pump unit and a thermostat which features dual fuel use. If the link is left intact, terminal O" will remain energized eliminating the HEAT MODE in the heat pump.

On−Board Link W915 Y1 to Y2 (Figure 4)

On−board link W915 is a clippable connection between terminals Y1 and Y2 on the integrated control. W915 must be cut if two−stage cooling will be used. If the link is not cut the outdoor unit will operate in second−stage cooling only.

Diagnostic LED (Figure 4)

The seven−segment diagnostic LED displays operating status, target airflow, error codes and other information. Table 14 lists diagnostic LED codes.

Diagnostic Push Button (Figure 4)

The diagnostic push button is located adjacent to the seven− segment diagnostic LED. This button is used to enable the Error Code Recall mode and the Field Test mode. Press the button and hold it to cycle through a menu of options. Every five seconds a new menu item will be displayed. When the button is released, the displayed item will be selected. Once all items in the menu have been displayed, the menu resumes from the beginning until the button is released.

Error Code Recall Mode

Select "E" from the menu to access the most recent 10 error codes. Select c" from the Error Code Recall menu to clear all error codes. Button must be pressed a second time while c" is flashing to confirm command to delete codes. Press the button until a solid ≡" is displayed to exit the Error Code Recall mode.

Field Test Mode

Use the diagnostic push button to scroll through the menu as described above. Release the button when the LED flashes −" to select the Field Test mode.

While in the Field Test mode the technician can:  Initiate furnace ignition and move to and hold low−fire

rate by applying a R to W1 jumper.

 Initiate furnace ignition sequence and move to and hold

high−fire rate by applying a jumper from R to W1 and W2.

 Initiate furnace ignition sequence and move to and hold

mid−fire rate by applying a jumper to R and W2.

 Apply then remove the jumper from R to W1 and W2 to

change the firing rate from low fire to mid fire and high fire.

 A vent calibration sequence can be initiated even if a

thermostat signal is not present. Press and hold the push button until a solid C" is displayed. Release the button and calibration will begin. The furnace will perform the high−fire and low−fire pressure switch calibrations and display CAL". After calibration, the LED will return to the flashing −" display.

During Field Test mode operation, all safety switches are still in the circuit (they are not by−passed) and indoor blower performance and timings will match DIP switch selections. Current furnace firing rate, indoor blower CFM and flame signal will be displayed. To exit the Field Test mode, press and hold the button. The menu will resume from the beginning. Also, cycle the main power to exit the Field Test mode. The integrated control will automatically exit the Field Test mode after 45 minutes of operation.

Page 21

+ 48 hidden pages

Lennox SLP98UHV SERIES, SLP98UH070V36B, SLP98UH090V36C, SLP98UH090V48C, SLP98UH090V60C Unit Information

Specifications and Main Features

Frequently Asked Questions

User Manual