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

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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.

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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

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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

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LPG/Propane to

Natural Gas Kit

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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.

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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.

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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.

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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.

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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).

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Page 9

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

Page 10

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

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

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

Page 12

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

Page 13

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

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.

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

Page 15

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

Page 16

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

Page 17

SLP98UHV INTEGRATED CONTROL CONFIGURATION GUIDE

FIGURE 5

Page 17

Page 18

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

Page 19

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

Page 20

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

Page 21

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

Page 22

TABLE 11

Idle Menu Options

These options are displayed on the menu when the button is pressed during normal operation

DISPLAY ACTION (when button released)

No change (idle) remain in idle mode

Solid E" enter diagnostic mode

Solid −" enter field test mode

NOTE − No change implies the display will continue to show whatever is currently being displayed for normal operation

Field Test Menu Options

TABLE 12

These options are displayed when the button is used in Field Test Mode

DISPLAY ACTION (when button released)

No change (blinking −") remain in field test mode

Solid −" exit field test mode

Solid c" start pressure switch calibration

TABLE 13

Field Test Menu Options

These options are displayed when the button is used in diagnostic recall mode

DISPLAY ACTION (when button released)

No change (displaying error history) remain in diagnostic recall mode

Solid (3 horizontal bars) exit diagnostic recall mode

Solid c" clear error history

Once the button is released to clear the error history a blinking c" will be shown on the display for up to 10 seconds. During this time the user must press and release the button one additional time to confirm the action of deleting the error history. Once the error history is deleted it cannot be recovered.

Page 22

Page 23

Configuring Unit Size Codes

Power−Up − Number displayed represents by integrated control unit size code (furnace model

and capacity). If three horizontal bars are displayed followed by continuous E203, furnace control does not recognize unit size code. Configure per the following:

Yes

To enter Field Test Mode: push and hold button next to 7−segment LED display until solid dash symbol appears. Release button.

If alarm is present, furnace control will display error code. If alarm is not present solid dash starts blinking on 7−segment LED display.

Push and hold button until the solid P symbol is displayed on the 7−segment LED. Release button. This mode allows the user to select a unit size code number that matches the furnace model size and capacity.

IMPORTANT: Field replacement controls may need to be manually configured to validate furnace unit size code.

Solid P starts blinking on 7−Segment LED

Push and hold button. Integrated control will display unit size code number for each furnace model for five seconds.

Furnace control in IDLE mode

No heating, cooling or indoor fan

operation)

−

Turn room thermostat to OFF

UNIT SIZE

CODE

FURNACE MODEL

SLP98UHV−070−36B

SLP98UHV−090−36C

SLP98UHV−090−48C

SLP98UHV−090−60C

SLP98UHV−110−60C

SLP98UHV−135−60D

When the correct unit size code is displayed, release button. Selected code will flash for 10−second period. During that period, hold push button until code stops blinking (disappear for 2 seconds). Integrated control will store code in memory and will automatically exit Field Test Mode and reset. (If second period expires or push button is held less than five seconds, control will automatically exit Field Test Mode and go into IDLE mode without storing unit size code. If this happens, programming function must be repeated).

−

Verify that the selected unit size code is correct and stored in non−volatile memory by cycling the 24 volt power to the furnace control. (At 24 volt power−up of the furnace control, the 7−segment LED will display a unit size code. If three horizontal bars display, board does not recognize unit size code. Programming function must be repeated)

−

FINISHED

Page 23

Page 24

TABLE 14

LED 7 Segment Status / Error Code

Integrated Control Diagnostic Codes

Press the diagnostic push button and hold it to cycle through a menu of options. Every five seconds a new menu item will be displayed. Release the button when the desired mode is displayed. When a solid "P" is displayed, the furnace capacity/ size is programmed. When the solid E" is displayed, the control enters the Error Code Recall mode. Error Code Recall mode menu options: No change (displaying error history) remains in Error Code Recall mode; solid b" exits Error Code Recall mode; and solid c" clears the error history. Must press button while flashing c" is displayed to clear error codes. When the solid −" is displayed, the control enters the Field Test mode. Field Test mode menu options: Solid C" starts pressure switch calibration; blinking −" exits Field Test mode.

Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover

Idle mode (Decimal blinks at 1 Hertz −− 0.5 second ON, 0.5 second OFF).



 Cubic feet per minute (cfm) setting for indoor blower (1 second ON, 0.5 second

OFF) / cfm setting for current mode displayed.

 Cooling stage (1 second ON, 0.5 second OFF) / 1 or 2 displayed / Pause / cfm set-

ting displayed / Pause / Repeat codes).

 Dehumidification mode (1 second ON) / 1 second OFF) / cfm setting displayed /

Pause / Repeat Codes).

 Variable Capacity Heat (1 second ON, 0.5 second OFF) / % of input rate displayed /

Pause/ cfm setting / Pause/ Repeat codes.

 Heat Stage (1 second ON, 0.5 second OFF) / 1 or 2 displayed / Pause / cfm setting

displayed / Pause / Repeat codes.

 Defrost mode.

  Device communication problem − No other devices on BUS (Communication sys-

tem).

  Low line voltage. Line Voltage low (Voltage lower than nameplate rating)

  High line voltage. Line Voltage High (Voltage higher than nameplate rating)

  Line voltage frequency out−of−range. No 60 hertz power (Check voltage and frequency).

  Low 24V − Control will restart if the error recovers. 24 voltage low (Range is 18 to 30 volts) Check voltage.

  Unresponsive device. Usually caused by delay in outdoor unit responding to

  Active communicating thermostat signal missing for more than 3 minutes. Equipment lost communication with the thermostat. Check

  Control failed self−check, internal error, failed hardware. Will restart if error recovers.

Integrated furnace control not communicating. Covers hardware errors (flame sense circuit faults, pin shorts, etc.).

  Failed internal control communication between microcontrollers. Hardware problem on the control board. Cycle power on

  Corrupted control parameters (Verify configuration of system). Reconfigure the system. Replace board if service (heating

  Outdoor air sensor failure − NO error if disconnected. Only shown if shorted or out−

of−range.

  Hard lockout − Rollout circuit open or previously open. Correct unit cause of rollout trip or replace flame rollout

  Indoor blower communication failure − Unable to communicate with blower motor. Indoor blower communication failure including power out-

  Indoor blower motor mis−match − Indoor motor horsepower does not match unit

capacity.

  Appliance capacity / size is NOT programmed. Invalid unit codes refer to configura-

tion flow chart in installation instructions.

  Gas valve mis−wired. Check operation of gas valve.

  Gas valve control relay contact shorted. Check operation of gas valve.

  Hot surface ignitor sensed open − Refer to troubleshooting in installation instruction. Measure resistance of Hot Surface Ignitor, replace if open

Equipment is unable to communicate. Check for mis wire and loose connections and check for a high voltage source of noise close to the system. (welder etc.).

Check voltage.

indoor unit poling recycle power, check wiring.

connections and cycle power on the thermostat.

Hardware problem on the control board. Cycle power on control. Replace if problem prevents service and is persistent.

control. Replace if problem prevents service and is persistent.

/cooling) is unavailable.

Compare outdoor sensor resistance to temperature resistance charts in installation instructions. Replace if necessary.

switch and test furnace operation.

age.

Incorrect furnace size code selected. Check unit size codes on configuration guide or in installation instructions.

No furnace size code selected. Check unit size codes on configuration guide or in installation instructions.

or not within specification.

Page 24

Page 25

Integrated Control Diagnostic Codes (continued)

Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover

  Low pressure switch failed open − Refer to troubleshooting in installation instruc-

tion.

  Low pressure switch failed closed − Refer to troubleshooting in installation instruc-

tion.

  High pressure switch failed open − Refer to troubleshooting in installation instruc-

tion.

  High pressure switch failed closed − Refer to troubleshooting in installation instruc-

tion.

  Low pressure switch open during trial for ignition or run mode. Refer to trouble-

shooting in installation instruction.

  Unable to perform successful pressure switch calibration. Retry after 300 seconds. Error counter cleared when exit-

  Low flame current − Run mode − Refer to troubleshooting in installation instruction. Check micro amperes of flame sensor, clean or replace

  Flame sensed out of sequence − Flame still present. Shut off gas, check for gas valve leak.

  Limit switch circuit open − Refer to troubleshooting in installation instruc-

tion.

  Discharge air temperature too high (gas heat only). Check temperature rise, air flow and input rate.

  Soft lockout − Exceeded maximum number of retries. No flame current

sensed.

  Soft lockout − Exceeded maximum number of retries. Last retry failed due

to the pressure switch opening.

  Soft lockout − Exceeded maximum number of recycles. Last recycle due

to the pressure switch opening.

  Soft lockout − Exceeded maximum number of recycles. Last recycle due

to flame failure.

  Soft lockout − Exceeded maximum number of recycles. Last recycle

failed due to the limit circuit opening or limit remained open longer than 3 minutes.

  Soft lockout − Flame sensed out of sequence from code 241 fault. Flame

signal is gone.

  Soft lockout − Exceeded maximum number of calibration retries. See E 228.

  Ignitor circuit fault − Failed ignitor or triggering circuitry. See E 207.

  Restricted air flow − Cubic feet per minute is lower than what is needed

for minimum firing rate.

  Indoor blower motor unable to start − Seized bearings, stuck wheel, etc. Indoor blower motor unable to start (seized bearing,

  Combustion air inducer motor amp draw is too high. Check combustion blower bearings, wiring , am-

Check inches of water column pressure during operation of low pressure switch on heat call, measure inches of water column of operating pressure, inspect vent and combustion air inducer for correct operation and restriction.

Check low pressure switch for closed contacts, measure inches of water column of operating pressure, inspect vent and combustion air inducer for correct operation and restriction.

Check inches of water column pressure of high pressure switch on heat call, measure inches of water column of operating pressure, inspect vent and combustion air inducer for correct operation and restriction.

Check high pressure switch for closed contacts, measure inches of water column of operating pressure, inspect vent and combustion air inducer for correct operation and restriction.

ing lockout, unable to perform pressure switch calibration. Check vent system and pressure switch wiring connections.

sensor. Measure voltage of neutral to ground for good unit ground.

Check why limit is tripping, overfired, low air flow.

Check for gas flow, ignitor lighting burner, flame sensor current.

See E 223.

See E 223 and E 225.

See E 240.

See E 250.

See E 241.

Check for dirty filter, unit air flow restriction, blower performance.

stuck wheel, etc), replace motor or wheel if assembly does not operate or meet performance.

peres, replace if it does not operate or meet performance.

Page 25

Page 26

Integrated Control Diagnostic Codes (continued)

Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover

  Indoor blower motor temperature is too high. Indoor blower motor over temperature (motor

  Discharge error sensor failure − No error if disconnected. Only shown if

shorted or out−of−range.

  Heat rate reduced to match indoor blower air flow. Replace filter or repair

duct restriction.

  Restricted air flow in cooling or continuous fan mode is lower than cfm

setting.

  Indoor or outdoor unit capacity mismatch. Incorrect Indoor /outdoor capacity code selected.

  Global network connection − Communication link problem. For Future Use.

  No 24 Volt output on Y1 to C with non−communicating outdoor unit. Y1 relay / Stage 1 failed (Pilot relay contacts did not

  No 24 Volt output on Y2 to C with non−communicating outdoor unit. Y2 relay / Stage 2 failed (Pilot relay contacts did not

  No 24 Volts between R & O with non−communicating outdoor unit (Dual

fuel module required for heat pump application).

  LSOM − Compressor ran more than 18 hours in air conditioning mode. Compressor protector is open. Check for high head

  LSOM − Outdoor unit system pressure trip. Compressor ran over 18 hours in air conditioning

  LSOM − Compressor short−cycling (Running less than 4 minutes). Outdoor unit pressure trip. Check dirty coil, fan mo-

  LSOM − Compressor rotor locked. Compressor short cycling (Running less than 4 min-

  LSOM − Compressor open circuit. Check capacitor, wiring, hard start kit , replace com-

  LSOM − Compressor open start circuit. Check compressor for hot (cool down) , check pres-

  LSOM − Compressor open run circuit.

  LSOM − Compressor contactor is welded.

  LSOM − Compressor low voltage. Replace contactor.

tripped on internal protector), Check motor bearings, amperes. Replace if necessary.

Discharge air temperature(DATS) out of range, code is activated during "Field test mode".

Furnace blower in cutback mode due to restricted airflow. Check filter and ductwork. To clear replace filter if needed or repair/ add ductwork.

Restricted airflow − Indoor blower is running at a reduced cubic feet per minute (Cutback Mode) − The variable speed motor has pre−set speed and torque limiters to protect the motor from damage caused by operating out of its designed parameters (0 to 0.8 inches water column total external static pressure). Check filter and ductwork. To clear replace filter if needed or repair/ add ductwork.

Check for proper configuration in installation instructions. Alarm is just a warning. The system operation is not impacted at all and alarm would clear when Commissioning is exited.

close or the relay coil did not energize).

Configuration link R to O needs to be cut on control board.

pressure, check compressor supply voltage. Outdoor unit power disconnect is open , compressor circuit breaker or fuse(s) is open, broken wire or connector is not making contact. Low or high pressure switch open if present in the system. Compressor contactor has failed to close.

mode.

tor, refrigerant charge.

utes).

pressor.

sures, fan motor etc. Replace compressor if unable to get circuit to close and compressor to operate.

Page 26

Page 27

TABLE 15

OPERATING SEQUENCE

SLP98UHV and Single−Stage Outdoor Unit

OPERATING

SEQUENCE

SYSTEM DEMAND SYSTEM RESPONSE

Demand Relative Humidity

System

Condition

Step

1st

stage

O G Status D*

NO CALL FOR DEHUMIDIFICATION

Normal Operation 1 On On On Acceptable

VAC

BASIC MODE (only active on a Y1 thermostat demand)

Normal Operation 1 On On On Acceptable

Dehumidification

Call

2 On On On Demand

VAC

PRECISION MODE (operates independent of a Y1 thermostat demand)

Normal Operation 1 On On On Acceptable

Dehumidification

call

Dehumidification

call ONLY

2 On On On Demand

1 On On On Demand

VAC

On−board links at indoor unit with a single−stage outdoor unit: With Condensing unit − Cut W914 (R to DS) on SureLight With Heat Pump − Cut W914 (R to DS) & W951(R to O) on SureLight control. *ComfortSense

7000 thermostat only

Compressor

High 100%

High 70%

High 100%

High 70%

control;

Blower

CFM

(COOL)

Comments

Compressor and indoor blower follow thermostat demand

Thermostat energizes Y1 and de−energizes D on a call for de−humidification

Dehumidification mode begins when humidity is greater than set point

Thermostat will keep outdoor unit energized after cooling temperature setpoint has been reached in order to maintain room humidity setpoint.

Page 27

Page 28

TABLE 16

OPERATING SEQUENCE

SLP98UHV and Two−Stage Outdoor Unit

OPERATING

SEQUENCE

SYSTEM DEMAND SYSTEM RESPONSE

Demand Relative Humidity

System

Condition

Step

1st

stage

2nd

stage

Status D*

NO CALL FOR DEHUMIDIFICATION

Normal Operation −

1 On On

2 On

Acceptable

VAC

ROOM THERMOSTAT CALLS FOR FIRST STAGE COOLING

BASIC MODE (only active on a Y1 thermostat demand)

Normal Operation 1 On On

Dehumidification

Call

2 On

Acceptable

Demand

VAC

PRECISION MODE (operates independent of a Y1 thermostat demand)

Normal Operation 1 On On

Dehumidification

call

Dehumidification

call ONLY

2 On

1 On

Acceptable

Demand

VAC

ROOM THERMOSTAT CALLS FOR FIRST AND SECOND STAGE COOLING

BASIC MODE (only active on a Y1 thermostat demand)

Normal Operation 1 On

Dehumidification

Call

2 On

Acceptable

Demand

VAC

PRECISION MODE (operates independent of a Y1 thermostat demand)

Normal Operation 1 On On

Dehumidification

call

2 On

Acceptable

Demand

VAC

Compressor

Low 70%

High 100%

Low 70%

High 70%

Low 70%

High 70%

High 100%

High 70%

Low 70%

High 70%

Blower

CFM

(COOL)

Comments

Compressor and indoor blower follow thermostat demand

Thermostat energizes 2nd stage and de−energizes D on a call for de− humidification

Dehumidification mode begins when humidity is greater than set point

Thermostat will keep outdoor unit energized after cooling temperature setpoint has been reached in order to maintain room humidity setpoint.*

Thermostat energizes 2nd stage and de−energizes D on a call for de− humidification

Dehumidification mode begins when humidity is greater than set point

Dehumidification

call ONLY

1 On

On−board links at indoor unit with a two−stage outdoor unit: Cut factory link from Y1 to Y2 or cut W915 (Y1 to Y2) on SureLight grated control. With Condensing unit − Cut W914 (R to DS) on SureLight With Heat Pump − Cut W914 (R to DS) & W951 (R to O) on SureLight integrated control. *ComfortSense

7000 thermostat only

Demand

Page 28

VAC

High 70%

inte-

integrated control;

Thermostat will keep outdoor unit energized after cooling temperature setpoint has been reached in order to maintain room humidity setpoint.

Page 29

B−Blower Compartment (Figure 7)

Power Choke

(4 and 5 Ton Only)

To Remove Blower From Unit: Remove access panels,

Control box, Bolts and Wiring Jackplugs.

1. Blower Motor (B3)

Blower Motor

(B3)

Then Slide Out Front of Unit.

FIGURE 7

WARNING

During blower operation, the ECM motor emits energy that may interfere with pacemaker operation. Interference is reduced by both the sheet metal cabinet and distance.

The SLP98UHV line uses three different motor sizes; 1/2 hp, 3/4 hp and 1hp. The motor communicates with the integrated control via a 2−way serial connection. The motor receives all necessary functional parameters from the integrated control and does not rely on a factory program like traditional variable speed motors. SLP98UHV units use a three-phase, electronically controlled D.C. brushless motor (controller converts single phase a.c. to three phase D.C.), with a permanentmagnet-type rotor (figure 8). Because this motor has a permanent magnet rotor it does not need brushes like conventional D.C. motors. Internal components are shown in figure 8. The stator windings are split into three poles which are electrically connected to the controller. This arrangement allows motor windings to turn on and off in sequence by the controller.

IMPORTANT

Earlier ECM motors used on other Lennox furnace models are not interchangeable with motors used on the SLP98UHV furnace line.

A solid-state controller is permanently attached to the motor. The controller is primarily an A.C. to D.C. converter. Converted D.C. power is used to drive the motor. The controller contains a microprocessor which monitors varying conditions inside the motor (such as motor workload).

SLP98UHV BLOWER MOTOR COMPONENTS

STATOR

(WINDINGS)

BEARING

ROTOR

FIGURE 8

The controller uses sensing devices to sense what position the rotor is in at any given time. By sensing the position of the rotor and then switching the motor windings on and off in sequence, the rotor shaft turns the blower.

All SLP98UHV blower motors use single phase power. An external run capacitor is not used. The motor uses permanently lubricated ball-type bearings.

Internal Operation

The motor is controlled via serial communication between the integrated control on the furnace and the controller attached to the motor shell. The messages sent back and forth between the two controls serve to communicate rotational direction, demand, motor size, current draw, torque, and rpm, among other variables.

Motor rpm is continually adjusted internally to maintain constant static pressure against the blower wheel. The controller monitors the static work load on the motor and motor amp-draw to determine the amount of rpm adjustment. Blower rpm may be adjusted any amount in order to maintain a constant cfm as shown in Blower Ratings Tables. The cfm remains relatively stable over a broad range of static pressure. Since the blower constantly adjusts rpm to maintain a specified cfm, motor rpm is not rated. Hence, the terms cool speed", heat speed " or speed tap" in this manual, on the unit wiring diagram and on blower B3, refer to blower cfm regardless of motor rpm.

Initial Power Up

When line voltage is applied to B3, there will be a large inrush of power lasting less than 1/4 second. This inrush charges a bank of DC filter capacitors inside the controller. If the disconnect switch is bounced when the disconnect is closed, the disconnect contacts may become welded. Try not to bounce the disconnect switch when applying power to the unit.

Page 29

Page 30

Motor Start-Up

When B3 begins start-up, the motor gently vibrates back and forth for a moment. This is normal. During this time the electronic controller is determining the exact position of the rotor. Once the motor begins turning, the controller slowly eases the motor up to speed (this is called soft-start"). The motor may take as long as 10-15 seconds to reach full speed. If the motor does not reach 200 rpm within 13 seconds, the motor shuts down. Then the motor will immediately attempt a restart. The shutdown feature provides protection in case of a frozen bearing or blocked blower wheel. The motor may attempt to start eight times. If the motor does not start after the eighth try, the controller locks out. Reset controller by momentarily turning off power to unit.

BLOWER B3 HARNESS CONNECTORS

P48 5 Pin

SHAFT

P49 4 Pin

MOTOR with INTEGRATED

CONTROLLER

J48 5 Pin

The DC filter capacitors inside the controller are connected electrically to the motor supply wires. The capacitors take approximately 5 minutes to discharge when the disconnect is opened. For this reason it is necessary to wait at least 5 minutes after turning off power to the unit before attempting to service motor.

DANGER

Disconnect power from unit and wait at least five minutes to allow capacitors to discharge before attempting to service motor. Failure to wait may cause personal injury or death.

Power Choke (L13)

A choke coil is used on SLP98UHV 4 and 5 ton units equipped with 3/4 hp and 1 hp motors.The choke is located on the blower housing and is used to suppress transient current spikes.

J49 4 Pin

J49 4 Pin Control Connector

J48 5 Pin Line Voltage Connector

FIGURE 9

Page 30

Page 31

Troubleshooting

To verify motor operation see steps below:

1− Remove J48 (5 pin power plug) from P48 on the motor.

2− With the power on at the furnace and door switch depressed, use a test meter to verify 120V between pins 4 and 5 on J48.

3− Reconnect J48 to P48 on the motor.

4− Remove J49 (4 pin low voltage connector) from P49 on the motor.

5− Using test jumpers, apply 24V to pins 3 and 4 on P49 on the motor.

Note: Do not apply 24V to pins 2 and 4 on P49. Doing so will cause permanent damage to the motor.

6− Motor should run at 75%.

7− Test is complete. Remove jumpers and reconnect plugs.

Another option is to use the TECMate PRO motor tester with the 16 to 4 pin adaptor. The use of the TECMate PRO isolates the motor from the integrated control. Follow the instructions provided with the kit. If the motor runs do not replace.

BLOWER B3 HARNESS CONNECTORS

P48 5 Pin

P49 4 Pin

SHAFT

MOTOR with INTEGRATED

CONTROLLER

P48 5 Pin

P49 4 Pin

C−Heating Components

1. Ignitor (Figure 11)

The SureLight® ignitor is made of durable silicon nitride. Ignitor longevity is enhanced by controlling voltage to the ignitor. The integrated control provides 120 volts to the ignitor for a consistent ignition. Due to this feature of the control, voltage measured with a digital meter will be slightly lower. To measure correct voltage use a true RMS meter or ignitor can be ohmed. Ohm value should be 39 to 70.

2. Flame Sensor (Figure 11)

A flame sensor (figure 11) is located on the left side of the burner support. The sensor is mounted on the flame rollout plate and the tip protrudes into the flame envelope of the left−most burner. The sensor can be removed for service without removing any part of the burners. During operation, flame is sensed by current passed through the flame and sensing electrode. The SureLight control allows the gas valve to remain open as long as flame signal is sensed. To check flame sense signal use the push−button found on the integrated control and go to Field Test Mode. The menu will display the flame signal. Table 17 shows the flame signal for the SLP98UHV unit.

TABLE 17

Flame Signal in Microamps

J48 Connector installed on motor

P49 4 Pin

120v

J48 Connector

240v

Normal Low Drop Out

2.6 or greater 2.5 or less 1.1

NOTE − A much higher than normal micro amp reading (15 for example) may appear when checking flame signal.

Page 31

24v Transformer

J49 Connector

FIGURE 10

Page 32

3. Flame Rollout Switches (Figure 11)

Flame rollout switch S47 is a high temperature limit located inside the burner box. Each furnace is equipped with two identical switches. The limit is a N.C. SPST manual-reset limit connected in series with the primary limit S10. When S47 senses rollout, the circuit breaks and the integrated control immediately stops ignition and closes the gas valve. If unit is running and flame rollout is detected, the gas valve will close and integrated control will be disabled. Rollout can be caused by a blocked heat exchanger, flue or lack of combustion air. The switch is factory set to trip (open) at 210°F and cannot be adjusted. The switch can be manually reset. To manually reset a tripped switch, push the reset button located on the center of the switch.

4. Burners (Figure 11)

All units use inshot burners. Burners are factory set and require no adjustment. Always operate the unit with the burner box front panel in place. Each burner uses an orifice (see table 29 for orifice size) that is precisely matched to the burner input.

Burner Box Assembly

Burners can be removed as a one piece assembly for service.

If burner assembly has been removed, it is critical to align cen-

ter of each burner to the center of the clamshell when re−instal-

ling. See more detail in Section VII− MAINTENANCE..

5. Duralock Plus Heat Exchanger (Figure 12)

SLP98UHV units use an aluminized steel primary and

stainless steel secondary heat exchanger assembly.

Heat is transferred to the air stream from all surfaces of

the heat exchanger. The shape of the heat exchanger en-

sures maximum efficiency.

The combustion air inducer pulls fresh air through the burn-

er box. This air is mixed with gas in the burners. The gas / air

mixture is then burned at the entrance of each clamshell.

Combustion gases are then pulled through the primary and

secondary heat exchangers and exhausted out the exhaust

vent pipe.

rollout switch

flame sensor

burner assembly

intake air collar

ignitor

burner box front cover

(remove screw to open cover)

sight glass

FIGURE 11

Page 32

Page 33

6. Primary Limit Control (S10)

Figure 12 shows the primary limit (S10) used on SLP98UHV units located in the heating vestibule panel. When excess heat is sensed in the heat exchanger, the limit will open. Once the limit opens, the furnace control energizes the supply air blower and de−energizes the gas valve. The limit automatically resets when unit temperature returns to normal. The switch is factory set and cannot be adjusted. In the event of restricted air flow, the integrated control will reduce firing rate and indoor blower airflow in 10% increments until a sustainable air flow is reached. If the furnace reaches 35% firing rate, and adequate air flow is not available, the furnace will shutdown and enter one hour watchguard. For limit replacement remove wires from limit terminals and rotate limit switch 90 degrees. Slowly remove from the vestibule panel.

A 24VAC 2−pin plug and gas control switch are located on the

valve. 24V applied to the pins enables valve operation.

Inlet and outlet pressure taps are located on the valve.

LPG change over kits are available from Lennox. Kits include

burner orifices and an LP gas valve.

DANGER

Danger of explosion.

There are circumstances in which odorant used with LP/propane gas can lose its scent. In case of a leak, LP/propane gas will settle close to the floor and may be difficult to smell. An LP/propane leak detector should be installed in all LP applications.

Primary Limit Location and Heat Exchanger

install limit face down

FIGURE 12

7. Gas Valve (GV1)

The SLP98UHV uses a variable capacity gas valve (figure

44) and is applicable for two−stage or variable capacity settings. See Thermostat selection modes" in the integrated control section (section A− subsection 4.) for more details The valve is internally redundant to assure safety shut−off. If the gas valve must be replaced, the same type valve must be used.

The burner box is sealed and operates under a negative

pressure. A pressure hose is connected from the burner box

to the gas valve. The gas valve senses the pressure in the

burner box and uses that to set the maximum manifold pres-

sure while the pressure switch with pressure conditioning

device adjusts the gas flow. This will compensate for differ-

ent vent configurations which can greatly affect the rate of

the unit.

NEGATIVE AIR

PRESSURE PORT

INLET

SUPPLY

PRESSURE

TAP

GAS VALVE SHOWN IN THE ON POSITION

POSITIVE AIR

PRESSURE PORT

OUTLET

MANIFOLD

PRESSURE TAP

FIGURE 13

Page 33

Page 34

8. Combustion Air Inducer (B6) & Pressure Switch (S18)

All SLP98UHV units are equipped with a combustion air inducer (B6) and dual pressure switch assembly (high fire and low fire). The pressure switch (figure 14) serves four functions. First it establishes calibration points for the vent calibration routine. The combustion air inducer’s speed at a given firing rate is a function of the vent system resistance. The calibration routine establishes the inducer speed required to make low and high fire switches for a given vent pipe installation and interpolates the speeds required to achieve all intermediate rates between these two points. The setting for low− fire switch on the assembly is such that it does not normally enter into the vent calibration routine.

Second, the switch proves combustion air inducer operation by sensing a vacuum energizing the control circuit and allowing ignition. The low fire pressure switch provides this function. Third, the switch interrupts the combustion process in the event vent outlet or combustion air intake blockage. Finally, the switch interrupts the combustion process if the condensate drainage system becomes blocked to the point the condensate level builds up in the cold end header box/ secondary coil or vent system.

WARNING

The pressure switch is a safety shut−down control in the furnace and must not be jumpered for any reason other than troubleshooting.

To troubleshoot the pressure switch, add a temporary jumper. The unit will not fire with the switch jumpered. Therefore, the pressure switch must be bypassed after the combustion air inducer is activated. This will determine if the pressure switch and furnace are operating properly. However, this may not indicate if the sealed combustion system is operating properly.

Pressure Switch (S18)

low fire

bracket

high fire

If the switch assembly is to be replaced, replace the entire assembly. Individual switch components cannot be replaced.

FIGURE 14

Page 34

Page 35

Vent Calibration

The vent calibration sequence establishes furnace operating parameters in a specific installation. The integrated control runs the calibration and may be repeated as necessary to maintain proper furnace operation. Prior to calibration, all duct work (and returns) vent pipe and condensate trap (primed) must be connected.

If calibration is successful the data is stored in memory and will be used to determine furnace operation and maintain parameters during heat call. If calibration is not successful, the integrated control will proceed to a 5 minute delay and signal the appropriate code. After the 5 minute delay the calibration will be repeated 4 more times with a 5 minute delay in between. If still unsuccessful after the 4 trials (total 5) the integrated control will go into a 1 hour soft lockout.

Calibration may be initiated by:

 Initial call for heat  Cycling main power off / on and then call for heat  Venting conditions change (affecting high and low

pressure switch operation)  Ramp down low fire switch check failed (calibration

will follow next call for heat)  The service technician (by pressing the push button found on the integrated control until the control cycles

through to Field Test Mode")

The integrated control will do the following during calibration:

1− Verify both low pressure switch and high pressure switch are open. If either are closed log error and end calibration.

2− Start inducer at a predetermined low RPM (1600). 3− After a 7.5 second delay and if the low pressure switch is still open, increase the RPM by 250. If after a 5

second delay the low pressure switch is still open, repeat steps 1, 2 and 3.

4− Decrease RPM by 50, wait 5 seconds and look for the low pressure switch to open. Repeat this step until it is closed.

5− Keep this RPM as RPM1. 6− Increase RPM to 1250. Wait 5 seconds. 7− Check high pressure switch, if open, increase RPM by 250. Repeat this step until closed. 8− Decrease RPM by 50, check after 5 seconds. Repeat

this step until switch is open. 9− Keep this RPM as RPM2. 10− Set RPM to 0. End calibration.

NOTE − If after a successful calibration and a heat call is present the integrated control will by−pass the prepurge state and go straight into ignitor warm up.

After calibration, the integrated control stores the RPM1 and RPM2 values. The low fire (35%) and high fire (100%) RPM points are calculated by adding margin values to the RPM1 and RPM2 values.

The integrated control also initiates a low fire switch check at the end of a normal heating cycle described below. If this check fails the pressure switch calibration will follow on the next call for heat.

1− The inducer runs 15 seconds at the last firing rate before the heat call ended.

2− Inducer runs at 35% firing rate RPM (RPM1 + low pressure switch open RPM margin value).

3− If low pressure switch is open, set flag for calibration on next call for heat. Turn inducer off until next call for heat.

4− If low pressure switch is closed move inducer speed to RPM1. Allow 5 seconds for stabilization.

5− If low pressure switch opens turn off inducer. No further action.

6− If low pressure switch is still closed, decrease inducer speed 1/2 of the low pressure switch open RPM margin. Allow 5 seconds to stabilize.

7− If low pressure switch is open turn off inducer. No further action.

8− If low pressure switch is still closed, set flag for calibration on next call for heat and turn off inducer.

Measuring pressure differential Figure 15

Checks of pressure differential can aid in troubleshooting. Lennox provides a kit (10L34) if necessary. When measuring the pressure differential, readings should be taken at the pressure switch. Lack of differential usually indicates problems in the intake or exhaust piping, but may i n di c at e pr o b l e m s i n the heat exchanger, condensing coil, header boxes, combustion inducer or other components.

The differential pressure is the difference in pressure measured across the cold end header box orifice.

Page 35

Page 36

Measuring Pressure Differential

RED TUBING

NEGATIVE

BLACK TUBING

POSITIVE

1 − Remove thermostat demand and allow unit to cycle off.

2 − Install a tee in the negative (−) line (red tubing) and a tee in the

positive (+) line (black tubing) running from the pressure switch to the cold end header box.

3 − Install a manometer with hose from the negative (−) side of

the manometer to the tee installed in the negative (−) line and with hose from the positive (+) side of the manometer to the tee in the positive (+) line.

NOTE − Both sides of the cold end header box are negative. However the (+) port reads less negative pressure than the (−) port.

FIGURE 15

The CAI is installed on the cold end header box. The cold end header box is a single piece made of hard plastic. The box has an internal channel where the combustion air inducer creates negative pressure at unit start up. The channel contains an orifice used to regulate flow created by the CAI. The box has pressure taps for the CAI pressure switch hoses.

The pressure switch measures the pressure differential across the CAI orifice (difference in the channel and cold end header box). See table 18 for orifice size per unit. If

replacement is necessary the gaskets used to seal the box to the vestibule panel and the CAI to the box, must also be replaced.

TABLE 18

SLP98UHV Unit C.A.I. Orifice Size

4 − Operate unit and observe manometer reading.

Readings will change as heat exchanger warms.

a. Take one reading immediately after start-up. b. Take a second reading after unit has reached steady state (approximately 5 minutes). This will be the pressure differential.

The pressure differential should be greater than those listed in table 19.

5 − Remove thermostat demand and allow to cycle off.

6 − Remove manometer and tee’s. Reinstall combustion air

sensing hoses to the pressure switch.

TABLE 19

Pressure Switch

0’ to 7500’

SLP98UHV Unit

Set Point

High Fire

Set Point

Low Fire

−070

−090

−110

1.00 + 0.05 0.25 + 0.05

−135

*Units over 7500 ft will require a conversion kit. See table 29.

−070 0.780

−090 0.920

−110 1.030

−135 1.170

Page 36

Page 37

II−icomfort Touch thermostat (if applicable)

In communicating applications the Lennox icomfort Touch thermostat must be used. In these applications the icomfort Touch thermostat overrides the DIP switch set-

tings on the integrated control. Refer to the illustrations provided with the thermostat for installation, set−up and operation.

See figures 16 and 17 for icomfort Touch thermostat wiring in communicating applications.

icomfort Touch Thermostat with SLP98UHV

and Non−Communicating Outdoor Unit

icomfort Touch Thermostat icomfort−Enabled SLP98UHV Indoor Furnace Non−Communicating Outdoor Air Conditioner

icomfort− ENABLED

SLP98UHV

OPTIONAL

DISCHARGE

AIR SENSOR

icomfort Touch

THERMOSTAT

FURNACE

OPTIONAL OUTDOOR

AIR SENSOR

NON−COMMUNICATING

OUTDOOR AIR

CONDITIONING UNIT −

1 OR 2 STAGE

icomfort Touch Thermostat with SLP98UHV

and icomfort−ENABLED Outdoor Unit

icomfort Touch Thermostat icomfort−Enabled SLP98UHV Indoor Furnace icomfort−Enabled Outdoor Air Conditioner or Heat Pump

icomfort− ENABLED

SLP98UHV

FURNACE

OPTIONAL

DISCHARGE

AIR SENSOR

OPTIONAL OUTDOOR

AIR SENSOR

icomfort TOUCH

THERMOSTAT

icomfort− ENABLED

OUTDOOR AIR CONDITIONING

OR HEAT PUMP UNIT

CLIP Y1 TO Y2 FOR

TWO−STAGE OPERATION

FIGURE 16

Page 37

Page 38

Optional Accessories for use with any icomfort System

Optional Accessories for use with any icomfort Touch System

DISCHARGE AIR SENSOR

icomfort Touch

THERMOSTAT

NOTE: 24V UV LIGHT APPLICATIONS

Furnace transformer will not have adequate va to power 24v UV light applications. An additional transformer for UV light applications is required.

icomfort− ENABLED

SLP98UHV

FURNACE

NOTE: icomfort THERMOSTAT SENSES HUMIDITY & CONTROLS 24V H" OUTPUT (& 120V H" OUTPUT) TO CYCLE HUMIDIFIER BASED ON DEMAND. NO OTHER CONTROL OR HUMIDISTAT REQUIRED.

OPTIONAL OUTDOOR AIR SENSOR FOR USE WITH HUMIDIFIER (IF NOT ALREADY IN THE SYSTEM FOR OTHER FUNCTIONS. BUILT INTO ALL icomfort OUTDOOR UNITS).

icomfort−

ENABLED SLP98UHV FURNACE

icomfort−

ENABLED SLP98UHV

FURNACE

HEPA BYPASS FILTER

X2680 HEPA

INTERLOCK KIT

LVCS VENTILATION CONTROL SYSTEM

SEE LVCS VENTILATION INSTRUCTIONS FOR DAMPER & SENSOR WIRING

PASS INDOOR BLOWER MOTOR COMMON WIRE THROUGH CURRENT LOOP.

SEE HEPA INTERLOCK KIT FOR INSTALLATION DETAILS

FIGURE 17

icomfort−

ENABLED SLP98UHVFURNACE

icomfort−

ENABLED SLP98UHV FURNACE

(C)

icomfort− ENABLED

OUTDOOR AIR

CONDITIONING OR

HEAT PUMP UNIT

NON−COMMUNICATING

1 OR 2 STAGE AC OR HP UNIT

(C)

(disables out-

door unit only)

Page 38

Page 39

III−PLACEMENT AND INSTALLATION

Pipe & Fittings Specifications

All pipe, fittings, primer and solvent cement must conform with American National Standard Institute and the American Society for Testing and Materials (ANSI/ASTM) standards. The solvent shall be free−flowing and contain no lumps, undissolved particles or any foreign matter that adversely affects the joint strength or chemical resistance of the cement. The cement shall show no gelation, stratification, or separation that cannot be removed by stirring. Refer to table 20 for approved piping and fitting materials.

PIPING AND FITTINGS SPECIFICATIONS

Schedule 40 PVC (Pipe) D1785 Schedule 40 PVC (Cellular Core Pipe) F891

Schedule 40 PVC (Fittings) D2466

Schedule 40 CPVC (Pipe) F441

Schedule 40 CPVC (Fittings) F438

SDR−21 PVC or SDR−26 PVC (Pipe) D2241

SDR−21 CPVC or SDR−26 CPVC (Pipe) F442

Schedule 40 ABS Cellular Core DWV (Pipe) F628

Schedule 40 ABS (Pipe) D1527

Schedule 40 ABS (Fittings) D2468

ABS−DWV (Drain Waste & Vent) (Pipe & Fittings)

PVC−DWV (Drain Waste & Vent) Pipe & Fittings)

PRIMER & SOLVENT CEMENT

PVC & CPVC Primer F656 PVC Solvent Cement D2564

CPVC Solvent Cement F493

ABS Solvent Cement D2235

PVC/CPVC/ABS All Purpose Cement For Fittings & Pipe of the same material

ABS to PVC or CPVC Transition Solvent Cement

CANADA PIPE & FITTING & SOLVENT

CEMENT

PVC & CPVC Pipe and Fittings PVC & CPVC Solvent Cement

ABS to PVC or CPVC Transition Cement

TABLE 20

D2661

D2665

ASTM

SPECIFICATION

D2564, D2235, F493

D3138

MARKING

ULCS636

CAUTION

Solvent cements for plastic pipe are flammable liquids and should be kept away from all sources of ignition. Do not use excessive amounts of solvent cement when making joints. Good ventilation should be maintained to reduce fire hazard and to minimize breathing of solvent vapors. Avoid contact of cement with skin and eyes.

IMPORTANT

SLP98UHV exhaust and intake connections are made of PVC. Use PVC primer and solvent cement when using PVC vent pipe. When using ABS vent pipe, use transitional solvent cement to make connections to the PVC fittings in the unit.

Use PVC primer and solvent cement or ABS solvent cement meeting ASTM specifications, refer to Table 20. As an alternate, use all purpose cement, to bond ABS, PVC, or CPVC pipe when using fittings and pipe made of the same materials. Use transition solvent cement when bonding ABS to either PVC or CPVC.

Low temperature solvent cement is recommended. Metal or plastic strapping may be used for vent pipe hangers. Uniformly apply a liberal coat of PVC primer for PVC

Canadian Applications Only − Pipe, fittings, primer and solvent cement used to vent (exhaust) this appliance must be certified to ULC S636 and supplied by a single manufacturer as part of an approved vent (exhaust) system. In addition, the first three feet of vent pipe from the furnace flue collar must be accessible for inspection.

Table 21 lists the available exhaust termination kits.

Page 39

Page 40

SLP98UH

UNIT

OUTDOOR TERMINATION KITS USAGE

TABLE 21

STANDARD CONCENTRIC

Outdoor Ex-

VENT

PIPE

DIA.

(in.)

haust Accel-

erator

(Dia. X

Length)

1−1/2" X 12" 2" X 12"

2 YES YES YES* YES YES YES

Outdoor Exhaust Accel-

erator

(Dia. X

Length)

2" Wall Plate

Kit

22G44

or 30G28

3" Wall Plate

Kit

44J40

or 81J20

2" Wall

Ring Kit

15F74 51W11**

FlushMount

Kit

Concentric

44W92

1−1/2"

Kit

71M80

2" Con-

centric Kit

69M29

44W92

3" Con-

centric Kit

60L46

or 44W93

070

090

110

135 3 YES

*Requires field−provided and installed 1−1/2" exhaust accelerator. ** Kit 51W11 is provided with a 1−1/2" accelerator which must be used with all SLP98UH−070 and SLP98UH−090.  Termination kits 44W92, 44W93, 30G28 and 81J20 are approved for use in Canadian installations.  The 44W92 concentric kit includes a 1−1/2" accelerator which must be installed on the exhaust outlet when this kit is used with the SLP98UH070V36B furnaces.

2−1/2 YES YES YES* YES YES YES

3 YES YES YES* YES YES YES

2 YES YES YES YES YES YES

2−1/2 YES YES YES YES YES YES

3 YES YES YES YES YES YES

2−1/2 YES YES YES YES YES

3 YES YES YES YES YES

YES

YES YES

6 − Promptly apply solvent cement to end of pipe and in-

Joint Cementing Procedure

All cementing of joints should be done according to the specifications outlined in ASTM D 2855.

side socket surface of fitting. Cement should be applied lightly but uniformly to inside of socket. Take care to keep excess cement out of socket. Apply second coat to end of pipe.

DANGER

DANGER OF EXPLOSION!

Fumes from PVC glue may ignite during system check. Allow fumes to dissipate for at least 5 minutes before placing unit into operation.

1 − Measure and cut vent pipe to desired length. 2 − Debur and chamfer end of pipe, removing any ridges or

rough edges. If end is not chamfered, edge of pipe may remove cement from fitting socket and result in a leak-

ing joint. 3 − Clean and dry surfaces to be joined. 4 − Test fit joint and mark depth of fitting on outside of pipe. 5 − Uniformly apply a liberal coat of PVC primer for PVC or

use a clean dry cloth for ABS to clean inside socket sur-

face of fitting and male end of pipe to depth of fitting

socket.

NOTE − Time is critical at this stage. Do not allow primer to dry before applying cement.

7 − Immediately after applying last coat of cement to pipe,

and while both inside socket surface and end of pipe are wet with cement, forcefully insert end of pipe into socket until it bottoms out. Turn PVC pipe 1/4 turn during assembly (but not after pipe is fully inserted) to distribute cement evenly. DO NOT turn ABS or cellular core pipe.

NOTE − Assembly should be completed within 20 seconds after last application of cement. Hammer blows should not be used when inserting pipe.

8 − After assembly, wipe excess cement from pipe at end

of fitting socket. A properly made joint will show a bead around its entire perimeter. Any gaps may indicate a defective assembly due to insufficient solvent.

9 − Handle joints carefully until completely set.

Page 40

Page 41

Venting Practices

Piping Suspension Guidelines

SCHEDULE 40 PVC −−

Support every 5 feet.

All other pipe* −−

Support every 3 feet.

9. In areas where piping penetrates joists or interior walls,

hole must be large enough to allow clearance on all

sides of pipe through center of hole using a hanger.

10. When furnace is installed in a residence where unit is shut down for an extended period of time, such as a vacation home, make provisions for draining condensate collection trap and lines.

Exhaust Piping (Figures 22 and 23)

* See table20 for allowable pipe.

NOTE − Isolate piping at the point where it exits the outside wall or roof in order to prevent transmission of vibration to the structure.

Wall Thickness Guidelines

24" maximum 3/4" minimum

inside outside

Wall

FIGURE 18

REPLACING FURNACE THAT WAS PART OF A

CHIMNEY

OR GAS

VENT

(Check sizing

for water

heater only)

FURNACE

(Replaced

by SLP98)

If an SLP98UHV furnace replaces a furnace which was commonly vented with another gas appliance, the size of the existing vent pipe for that gas appliance must be checked. Without the heat of the original furnace flue products, the existing vent pipe is probably oversized for the single water heater or other appliance. The vent should be checked for proper draw with the remaining appliance.

COMMON VENT SYSTEM

WATER

HEATER

OPENINGS

(To Adjacent

Room)

FIGURE 19

11. Route piping to outside of structure. Continue with installation following instructions given in piping termination section.

CAUTION

Do not discharge exhaust into an existing stack or stack that also serves another gas appliance. If vertical discharge through an existing unused stack is required, insert PVC pipe inside the stack until the end is even with the top or outlet end of the metal stack.

CAUTION

The exhaust vent pipe operates under positive pressure and must be completely sealed to prevent leakage of combustion products into the living space.

Vent Piping Guidelines

The SLP98UHV is installed only as a Direct Vent gas central furnace.

NOTE − In Direct Vent installations, combustion air is taken from outdoors and flue gases are discharged outdoors.

Intake and exhaust pipe sizing −− Size pipe according to

tables 22 and 23. Table 22 lists the minimum vent pipe lengths permitted. Table 23 lists the maximum pipe lengths permitted.

Regardless of the diameter of pipe used, the standard roof and wall terminations described in section Exhaust Piping Terminations should be used. Exhaust vent termination pipe is sized to optimize the velocity of the exhaust gas as it exits the termination. Refer to table 24.

In some applications which permit the use of several different sizes of vent pipe, a combination vent pipe may be used. Contact Lennox’ Application Department for assistance in sizing vent pipe in these applications.

Use the steps in figure 21 to correctly size vent pipe diameter.

Page 41

Page 42

Exhaust Pipe

12" Min.

12" max

of straight pipe

Horizontal Application

NOTE − All horizontal runs of exhaust pipe must slope back toward unit. A minimum of 1/4" (6mm) drop for each 12" (305mm) of horizontal run is mandatory for drainage.

NOTE − Exhaust pipe MUST be glued to furnace exhaust fittings.

NOTE − Exhaust piping should be checked carefully to make

sure there are no sags or low spots.

FIGURE 20

NOTE − The exhaust collar on all models is sized to accommodate 2" Schedule 40 vent pipe. When vent pipe which is larger than 2" must be used in an upflow application, a 2" elbow must be applied at the exhaust collar in order to properly transition to the larger diameter vent pipe. This elbow must be added to the elbow count used to determine acceptable vent lengths. Contact the Application Department for more information concerning sizing of vent systems which include multiple pipe sizes.

Furnace capacity?

Which termination?

Which needs most elbows?

How many?

Desired pipe size?

070, 090, 110 or 135 btuh

Standard or Concentric? See table 21

Intake or exhaust?

2", 2 1/2", 3"

IMPORTANT

Do not use screens or perforated metal in exhaust or intake terminations. Doing so will cause freeze−ups and may block the terminations.

MINIMUM VENT PIPE LENGTHS

SLP98UHV

MODEL

070, 090

110**

135***

*Any approved termination may be added to the minimum equivalent length listed.

TABLE 22

MIN. EQUIV.

VENT

LENGTH

15 ft.*

EXAMPLE

5 ft. plus 2 elbows of 2", 2−1/2",

3" or 4" diameter pipe

5 ft. plus 2 elbows of 2−1/2" 3" or

4" diameter pipe

5 ft. plus 2 elbows of 3" or 4"

diameter pipe

What is the altitude?

Use table 23 to

find max pipe length

FIGURE 21

Page 42

Page 43

Number

Of 90°

Elbows

Used

Number

Of 90°

Elbows

Used

Maximum Allowable Vent Length in Feet

TABLE 23

Standard Termination at Elevation 0 − 7500’

Pipe Size

Model 070 090 110 135 070 090 110 135 070 090 110 135

1 91 69 2 86 64 135 88 38 157 138 113 109 3 81 59 130 83 33 152 133 108 104 4 76 54 125 78 28 147 128 103 99 5 71 49 120 73 23 142 123 98 94 6 66 44 11 5 68 18 137 118 93 89 7 61 39 11 0 63 13 132 113 88 84 8 56 34 105 58 9 51 29 100 53 122 103 78 74

10 46 24 95 48 11 7 98 73 69

Pipe Size

Model 070 090 110 135 070 090 110 135 070 090 110 135

1 66 44 2 61 39 11 0 63 132 113 88 84 3 56 34 105 58 127 108 83 79 4 51 29 100 53 122 103 78 74 5 46 24 95 48 11 7 98 73 69 6 41 19 90 43 11 2 93 68 64 7 36 14 85 38 107 88 63 59 8 31 9 26 75 28 97 78 53 49

10 21 70 23 92 73 48 44

2" 2−1/2" 3"

140 93 43

n/a n/a

n/a

Standard Termination at Elevation 7501’ − 10,000’

2" 2−1/2" 3"

115 68

n/a n/a

80 33 102 83 58 54

n/a

n/a n/a

n/a

162 143 118 114

127 108 83 79

137 118 93 89

Number

Of 90°

Ebows

Used

Number

Of 90°

Elbows

Used

Concentric Termination at Elevation 0 − 7500’

Pipe Size

Model 070 090 110 135 070 090 110 135 070 090 110 135

1 83 67 2 78 62 125 84 34 141 134 109 100 3 73 57 120 79 29 136 129 104 95 4 68 52 11 5 74 24 131 124 99 90 5 63 47 11 0 69 19 126 119 94 85 6 58 42 105 64 14 121 114 89 80 7 53 37 100 59 8 48 32 95 54 111 104 79 70 9 43 27 90 49 106 99 74 65

10 38 22 85 44 101 94 69 60

Pipe Size

Model 070 090 110 135 070 090 110 135 070 090 110 135

1 58 42 2 53 37 100 59 116 109 84 75 3 48 32 95 54 111 104 79 70 4 43 27 90 49 106 99 74 65 5 38 22 85 44 101 94 69 60 6 33 17 80 39 96 89 64 55 7 28 12 75 34 91 84 59 50 8 23 9 18 65 24 81 74 49 40

10 13 60 19 76 69 44 35

2" 2−1/2" 3"

130 89 39

n/a n/a

n/a

Concentric Termination at Elevation 7501’ − 10,000’

2" 2−1/2" 3"

105 64

n/a n/a

70 29 86 79 54 45

n/a

n/a n/a

n/a

146 139 114 105

116 109 84 75

121 114 89 80

Page 43

Page 44

TYPICAL EXHAUST PIPE CONNECTIONS AND CONDENSATE TRAP INSTALLATION

IN UPFLOW APPLICATIONS

3”

TRANSITION

TRAP

2”

Use only the factory− supplied

trap. Trap can be installed on

either side of cabinet within 5 ft

of the furnace

2”

DO NOT transition from smaller to larger pipe size in horizontal runs of exhaust pipe.

FIGURE 22

TYPICAL EXHAUST PIPE CONNECTIONS AND CONDENSATE TRAP INSTALLATION

IN HORIZONTAL AIR APPLICATIONS

(RIGHT HAND DISCHARGE SHOWN)

12" max.

2”

Use only the factory−

supplied trap. Trap MUST

be installed on left side

for left hand discharge

within 5 ft of the furnace.

2”

DO NOT transition from smaller to larger pipe size in horizontal runs of exhaust pipe.

FIGURE 23

45°

3”

TRANSITION

2”

MAX

SIDE VIEW

45°

MAX

Page 44

Page 45

Intake Piping

The SLP98UHV furnace may be installed only in direct vent applications.

TYPICAL AIR INTAKE PIPE CONNECTIONS IN UPFLOW

APPLICATIONS

The SLP98UHV is designed for combustion air intake through an inlet in the unit’s top cap. Intake air piping is independent of exhaust piping.

3”

TRANSITION

*2”

TRAP

2”

TRANSITION

2”

Use only the factory− supplied trap. Trap can be installed on either side of cabinet within 5 ft of the furnace.

3”

2”

FIGURE 24

TYPICAL AIR INTAKE PIPE CONNECTIONS IN HORIZONTAL

DISCHARGE AIR APPLICATIONS

(RIGHT HAND DISCHARGE SHOWN)

Use only the factory− supplied

trap. Trap MUST be installed

left side for left hand discharge

within 5 ft of the furnace.

2”

3”

TRANSITION

2”

FIGURE 25

Page 45

Page 46

VENT TERMINATION CLEARANCES

FOR DIRECT VENT INSTALLATIONS IN THE USA AND CANADA

INSIDE CORNER

DETAIL

Fixed

Closed

Operable

VENT TERMINAL

AIR SUPPLY INLET

US Installations

A =

B =

Clearance above grade, veranda,

porch, deck or balcony

Clearance to window or

door that may be opened

12 inches (305mm) or 12 in. 305mm)

above average snow accumulation.

6 inches (152mm) for appliances <10,000

Btuh (3kw), 9 inches (mm) for appliances

> 10,000 Btuh (3kw) and <50,000 Btuh

(15 kw), 12 inches (305mm) for ap-

pliances > 50,000 Btuh (15kw)

C =

Clearance to permanently

closed window

D =

Vertical clearance to ventilated soffit

located above the terminal within a

* Equal to or greater than soffit depth

horizontal distance of 2 feet (mm)

from the center line of the terminal

E =

F =

G =

H =

Clearance to unventilated soffit

Clearance to outside corner

Clearance to inside corner

Clearance to each side of center line ex-

tended above meter / regulator assembly

I =

Clearance to service regulator

vent outlet

J =

Clearance to non−mechanical air

supply inlet to building or the com-

bustion air inlet to any other ap-

pliance

* Equal to or greater than soffit depth * Equal to or greater than soffit depth

* No minimum to outside corner

* 3 feet (.9m)

3 feet (.9m) within a height 15 feet (4.5m)

above the meter / regulator assembly

3 feet (.9m)

6 inches (152mm) for appliances <10,000

Btuh (3kw), 9 inches (mm) for appliances

> 10,000 Btuh (3kw) and <50,000 Btuh

(15 kw), 12 inches (305mm) for ap-

pliances > 50,000 Btuh (15kw)

K =

L =

M =

 A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.

 Permitted only if veranda, porch, deck or balcony is fully open on a minimum of two sides beneath the floor. Lennox recommends avoiding this location if possible.

Clearance to mechanical air sup-

ply inlet

Clearance above paved sidewalk or

paved driveway located on public property

Clearance under veranda, porch,

deck or balcony

In accordance with the current ANSI Z223.1/NFPA 54 Natural Fuel Gas Code

In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code

3 feet (.9m) above if within 10 feet

(3m) horizontally

* 7 feet (2.1m)

*12 inches (305mm)

FIGURE 26

Operable

Fixed

Closed

AREA WHERE TERMINAL IS NOT PERMITTED

Canadian Installations

12 inches (305mm) or 12 in. 305mm)

above average snow accumulation.

6 inches (152mm) for appliances <10,000

Btuh (3kw), 12 inches (305mm) for

appliances > 10,000 Btuh (3kw) and

<100,000 Btuh (30kw), 36 inches (.9m)

for appliances > 100,000 Btuh (30kw)

* 12"

* Equal to or greater than soffit depth* Equal to or greater than soffit depth

* No minimum to outside corner

* 3 feet (.9m)

3 feet (.9m) within a height 15 feet (4.5m)

above the meter / regulator assembly

3 feet (.9m)

6 inches (152mm) for appliances <10,000

Btuh (3kw), 12 inches (305mm) for

appliances > 10,000 Btuh (3kw) and

<100,000 Btuh (30kw), 36 inches (.9m)

for appliances > 100,000 Btuh (30kw)

6 feet (1.8m)

7 feet (2.1m)

12 inches (305mm)

*For clearances not specified in ANSI Z223.1/NFPA 54 or CSA B149.1, clearance will be in accordance with local installation codes and the requirements of the gas supplier and these installation instructions."

Page 46

Page 47

Details of Intake and Exhaust Piping Terminations for

Direct Vent Installations

FIELD−SUPPLIED WALL TERMINATION OR

(15F74) WALL RING TERMINATION KIT

NOTE − In Direct Vent installations, combustion air is taken from outdoors and flue gases are discharged to outdoors.

Intake and exhaust pipes may be routed either horizontally through an outside wall or vertically through the roof. In attic or closet installations, vertical termination through the roof is preferred. Figures 27 through 38 show typical terminations.

1. Exhaust and intake exits must be in same pressure zone. Do not exit one through the roof and one on the side. Also, do not exit the intake on one side and the exhaust on another side of the house or structure.

2. Intake and exhaust pipes should be placed as close together as possible at termination end (refer to illustrations). Maximum separation is 3" (76mm) on roof terminations and 6" (152mm) on side wall terminations.

3. On roof terminations, the intake piping should terminate straight down using two 90° elbows (See figure

27).

4. Exhaust piping must terminate straight out or up as shown. A reducer may be required on the exhaust piping at the point where it exits the structure to improve the velocity of exhaust away from the intake piping. See table 24.

NOTE − Care must be taken to avoid recirculation of exhaust back into intake pipe.

Inches(mm)

3"(76mm) MAX.

SIZE TERMINATION

PIPE PER TABLE 24.

NOTE − FIELD−PROVIDED

REDUCER MAY BE

REQUIRED TO ADAPT

LARGER VENT PIPE SIZE

TO TERMINATION

1/2" (13mm) ARMAFLEX

INSULATION IN UN-

CONDITIONED SPACE

SIZE TERMINATION

PER TABLE 24

1/2" (13mm) ARMAFLEX INSULATION

IN UNCONDITIONED SPACE

STRAIGHT

APPPLICATION

* WALL

SUPPORT

EXTENDED

APPLICATION

See venting table 23 for maximum venting lengths with this arrangement.

* Use wall support every 24" (610 mm). Use two wall supports if extension is greater than 24" (610 mm) but less than 48" (1219 mm). NOTE − One wall support must be 6" (152 mm) from top of each pipe (intake and exhaust).

UNCONDITIONED

8" (203mm) MIN

12" (305mm) ABOVE

AVERAGE SNOW

ACCUMULATION

3" (76mm) OR

2" (51mm) PVC

PROVIDE SUPPORT

FOR INTAKE AND

EXHAUST LINES

DIRECT VENT ROOF TERMINATION KIT

(15F75 or 44J41)

FIGURE 27

ATTIC SPACE

1/2" (13mm) FOAM

INSULATION IN

UNCONDITIONED

SPACE

Page 47

A−Minimum clearance

above grade or average

snow accumulation

B−Maximum horizontal

separation between

intake and exhaust

C−Minimum from

end of exhaust to

inlet of intake

D−Maximum exhaust

pipe length

E−Maximum wall support

distance from top of each

pipe (intake/exhaust)

2" (51mm)

Vent Pipe

12" (508MM) 12" (508MM)

6" (152MM) 6" (152MM)

8" (203MM) 8" (203MM)

12" (305MM) 20" (508MM)

6" (152MM) 6" (152MM)

3" (76mm)

Vent Pipe

FIGURE 28

Page 48

FIELD−SUPPLIED WALL TERMINATION OR

(15F74) WALL RING TERMINATION KIT

With INTAKE ELBOW

NOTE − FIELD−PROVIDED

REDUCER MAY BE

REQUIRED TO ADAPT

LARGER VENT PIPE SIZE

TO TERMINATION.

1/2" (13mm) ARMAFLEX

INSULATION IN UN-

CONDITIONED SPACE

SIZE TERMINATION

PER TABLE 24

* WALL

SUPPORT

1/2" (13mm) ARMAFLEX INSULATION

IN UNCONDITIONED SPACE

STRAIGHT

APPPLICATION

See venting table 23 for maximum venting lengths with this arrangement.

2" (51mm)

Vent Pipe

A−Minimum clearance

above grade or average

snow accumulation

B−Maximum horizontal separation between

intake and exhaust

C−Minimum from

end of exhaust to

inlet of intake

D−Maximum exhaust

pipe length

E−Maximum wall support

distance from top of each

pipe (intake/exhaust)

12" (508MM) 12" (508MM)

6" (152MM) 6" (152MM)

6" (152MM)

12" (305MM) 20" (508MM)

6" (152MM) 6" (152MM)

EXTENDED

APPLICATION

3" (76mm)

Vent Pipe

6" (152MM)

FIGURE 29

EXHAUST PIPE TERMINATION SIZE REDUCTION

SLP98UHV

MODEL

*070 2", 2−1/2" or 3" 1−1/2" *090 2", 2−1/2" or 3" 2"

110 2−1/2" or 3" 2" 135 3" 2"

Exhaust Pipe Size Termination Pipe Size

*SLP98UH−070 and −090 units with the flush−mount termination must use the 1−1/2"accelerator supplied with the kit.

5. On field−supplied terminations for side wall exit, exhaust piping may extend a maximum of 12 inches (305mm) for 2" PVC and 20 inches (508mm) for 3" (76mm) PVC beyond the outside wall. Intake piping should be as short as possible. See figures 28 and 29.

6. On field−supplied terminations, a minimum distance between the end of the exhaust pipe and the end of the intake pipe without a termination elbow is 8" and a minimum distance of 6" with a termination elbow. See figures 28 and 29.

7. If intake and exhaust piping must be run up a side wall to position above snow accumulation or other obstructions, piping must be supported every 24" (610mm) as shown in figures 28 and 29. In addition, close coupled wall termination kits must be extended for use in this application. See figures 36 and 37. When exhaust and intake piping must be run up an outside wall, the exhaust piping must be terminated with pipe sized per table 24.The intake piping may be equipped with a 90° elbow turndown. Using turndown will add 5 feet (1.5m) to the equivalent length of the pipe.

8. Based on the recommendation of the manufacturer, a multiple furnace installation may use a group of up to four terminations assembled together horizontally, as shown in figure 33.

2" EXTENSION FOR 2" PVC PIPE 1" EXTENSION FOR 3" PVC PIPE

TABLE 24

FURNACE

INTAKE PIPE

4’’

FLAT SIDE

GLUE EXHAUST END

1−1/2" ACCELERATOR

(ALL 070 AND 090 UNITS)

FURNACE EXHAUST

PIPE

FLUSH INTO

TERMINATION

FLUSH−MOUNT SIDE WALL TERMINATION

51W11

FIGURE 30

Page 48

Page 49

12” (305mm)

Minimum

Above Average

Snow

Accumulation

CLAMP

1 1/2" (38mm) accelerator

provided with 71M80 &

44W92 kits for

SL98UH070V36B

INTAKE

FLASHING

(Not Furnished)

SHEET METAL STRAP

(Clamp and sheet metal strap must be field−installed to support the weight of the termination kit.)

FIELD−PROVIDED

REDUCER MAY BE REQUIRED

TO ADAPT LARGER VENT

PIPE SIZE TO TERMINATION

Front View

INTAKE

AIR

Top View

1/2" (13mm) Foam Insulation

in Unconditioned Space

FIELD−PROVIDED

REDUCER MAY BE

REQUIRED TO

ADAPT LARGER

VENT PIPE SIZE

TO TERMINATION.

EXHAUST VENT

SIZE

TERMINATION

PIPE PER

TABLE 24.

EXHAUST VENT

INTAKE AIR

6 (152mm) MIN.

DIRECT VENT CONCENTRIC ROOFTOP TERMINATION

71M80, 69M29 or 60L46 (US)

41W92 or 41W93 (Canada)

FIGURE 31

FIELD−PROVIDED

REDUCER MAY BE RE-

QUIRED TO ADAPT

LARGER VENT PIPE

SIZE TO TERMINATION.

EXHAUST

AIR

INTAKE

AIR

OUTSIDE

WALL

CLAMP

(Not Furnished)

DIRECT VENT CONCENTRIC WALL TERMINATION

71M80, 69M29 or 60L46 (US)

41W92 or 41W93 (Canada)

1 1/2" (38mm) accelerator

provided on 71M80 &

44W92 kits for

SL98UHV−36B−070

INTAKE

AIR

EXHAUST

12" (305mm) Min.

INTAKE

above grade or

AIR

average snow ac-

cumulation.

GRADE

FIGURE 32

EXHAUST

VENT

(127mm)

INTAKE

AIR

18" MAX. (457mm)

EXHAUST VENT

Inches (mm)

INTAKE

AIR

optional intake elbow

Side View

OPTIONAL VENT TERMINATION FOR MULTIPLE UNIT

INSTALLATION OF DIRECT VENT WALL TERMINATION KIT

(22G44, 44J40, 30G28 or 81J20)

12"

(305mm)

5−1/2"

(140mm)

Front View

12" (305mm) Min.

above grade or

average snow ac-

cumulation.

FIGURE 33

AIR

DIRECT VENT WALL TERMINATION KIT

(30G28 or 81J20)

FIGURE 34

Front View

INTAKE

AIR

Top View

1/2" (13mm) Foam Insulation

in Unconditioned Space

FIELD−PROVIDED

REDUCER MAY BE

REQUIRED TO

ADAPT LARGER

VENT PIPE SIZE

TO TERMINATION.

DIRECT VENT WALL TERMINATION KIT

(22G44 or 44J40)

FIGURE 35

OUTSIDE WALL

EXHAUST VENT

SIZE

TERMINATION

PIPE PER

TABLE 24.

EXHAUST VENT

INTAKE AIR

8" (206mm) MIN.

OUTSIDE WALL

Page 49

Page 50

WALL TERMINATION KITS (CLOSE−COUPLE)

EXTENDED VENT FOR GRADE CLEARANCE

If intake and exhaust pipe is less than 12 in. (305 mm) above snow accumulation or other obstructions, field−fabricated piping must be installed.

8” (203 mm) min. for 2” (51 mm) & 3” (76 mm) DIA. pipe

WALL SUPPORT*

6” (152 mm)

Maximum

between the end of the exhaust pipe and intake pipe 12” (305 mm) max. for 2” (51 mm) dia. exhaust 20” (508 mm) max. for 3” (76 mm) dia. exhaust

8” (203 mm) Min.

12” (305 mm) max. for 2” (51 mm) dia. exhaust 20” (508 mm) max. for 3” (76 mm) dia. exhaust

2 inch (51 mm) 22G44 (US)

3 inch (76 mm) 44J40 (US)

EXHAUST

AIR

INTAKE

AIR

5” (127 mm)

12” (305 mm) Minimum

Above Grade or Average

Snow Accumulation

GRADE

*Use wall support every 24" (610). Use two supports if

extension is greater than 24" but less than 48".

AIR

REDUCER MAY BE REQUIRED TO ADAPT

LARGER VENT PIPE SIZE TO TERMINATION

FIELD−PROVIDED

12”

(305 mm)

1/2” (13 mm)

FOAM INSULATION

(Field−Furnished)

EXHAUST

AIR

12” (305 mm) Minimum

5−1/2”

(140 mm)

Above Grade or Average

Snow Accumulation

GRADE

WALL TERMINATION KITS (CLOSE−COUPLE) EXTENDED VENT FOR GRADE CLEARANCE

2 inch (51 mm) 30G28 (WTK Canada) 3 inch (76 mm) 81J20 (WTK Canada)

See Installation Instructions for additional information.

If intake and exhaust pipe is less than 12 in. (305 mm) above snow accumulation or other obstructions, field−fabricated piping must be installed.

WALL SUPPORT*

6” (152 mm)

Maximum

12” (305 mm) max. for 2” (51 mm) dia. exhaust 20” (508 mm) max. for 3” (76 mm) dia. exhaust

6” (152 mm)

Minimum

6” (152 mm)

Minimum

FIGURE 36

EXHAUST

AIR

INTAKE

AIR

12” (305 mm) Minimum

Above Grade or Average

Snow Accumulation

GRADE

REDUCER MAY BE REQUIRED TO ADAPT

LARGER VENT PIPE SIZE TO TERMINATION

FIELD−PROVIDED

12”

(305 mm)

INTAKE

AIR

5” (127 mm)

5−1/2”

(140 mm)

1/2” (13 mm)

FOAM INSULATION

(Field−Furnished)

EXHAUST

AIR

12” (305 mm) Minimum

Above Grade or Average

Snow Accumulation

GRADE

12” (305 mm) max. for 2” (51 mm) dia. exhaust 20” (508 mm) max. for 3” (76 mm) dia. exhaust

FIGURE 37

Page 50

*Use wall support every 24" (610). Use two supports if

extension is greater than 24" but less than 48".

Page 51

SLP98 DIRECT VENT APPLICATION

USING EXISTING CHIMNEY

3" − 8"

8" − 12"

(203mm − 305mm)

Minimum 12" (305MM)

above chimney top

plate or average snow

accumulation

*SIZE TERMINATION PIPE PER TABLE 24.

NOTE − Do not discharge exhaust gases directly into any chimney or vent stack. If vertical discharge through an existing unused chimney or stack is required, insert piping inside chimney until the pipe open end is above top of chimney and terminate as illustrated. In any exterior portion of chimney, the exhaust vent must be insulated.

INTAKE PIPE

INSULATION (optional)

SHEET

METAL TOP

PLATE

INSULATE

TO FORM

SEAL

(76mm− 203mm)

STRAIGHT−CUT OR

ANGLE−CUT IN DIRECTION

OF ROOF SLOPE *

EXHAUST VENT

1/2" (13mm)

WEATHERPROOF

INSULATION

SHOULDER OF FITTINGS

PROVIDE SUPPORT

OF PIPE ON TOP PLATE

3" − 8"

(76mm−

203mm)

ALTERNATE INTAKE PIPE

EXTERIOR

PORTION OF

CHIMNEY

FIGURE 38

Condensate Piping

This unit is designed for either right- or left-side exit of condensate piping in upflow applications. In horizontal applications, the condensate trap must extend below the unit. An 8" service clearance is required for the condensate trap. Refer to figure 39 for condensate trap locations.

NOTE − If necessary the condensate trap may be installed up to 5 feet away from the furnace. Piping from furnace must slope down a minimum of 1/4" per ft. toward trap.

1 − Determine which side condensate piping will exit the

unit, location of trap, field−provided fittings and length of PVC pipe required to reach available drain.

2 − Remove plug (figure 39) from the cold end header box

at the appropriate location on the side of the unit. Install field−provided 1/2 NPT male fitting into cold end header box. Use teflon tape or appropriate pipe dope.

3 − Install drain trap using appropriate PVC fittings, glue all

joints. Glue the provided drain trap as shown in figure

41. Route the condensate line to an open drain.

4 − If unit will be started immediately upon completion of

installation, prime trap per procedure outlined in Unit Start−Up section.

CONDENSATE TRAP LOCATIONS

(Unit shown in upflow position with remote trap)

Field Provided Vent

Min. 1" Above Condensate

Drain Connection

1" Min.

*5’ max.

PVC Pipe Only

Trap Can Be Installed a

Maximum 5’ From Furnace

CONDENSATE TRAP AND PLUG LOCATIONS

(Unit shown in upflow position)

1−1/2 in.

Trap

(same on

right side)

Plug

(same on left

side)

NOTE − In upflow applications where side return air filter is installed on same side as the condensate trap, filter rack must be installed beyond condensate trap or trap must be relocated to avoid interference.

FIGURE 39

To Drain

*Piping from furnace must slope down a minimum of 1/4" per ft. toward trap.

FIGURE 40

Condensate line must be sloped downward away from condensate trap to drain. If drain level is above condensate trap, condensate pump must be used. Condensate drain line should be routed within the conditioned space to avoid freezing of condensate and blockage of drain line. If this is not possible, a heat cable kit may be used on the condensate trap and line. Heating cable kit is available from Lennox in various lengths; 6 ft. (1.8m) − kit no. 26K68; 24 ft. (7.3m) − kit no. 26K69; and 50 ft. (15.2m) − kit no. 26K70.

CAUTION

Do not use copper tubing or existing copper con- densate lines for drain line.

Page 51

Page 52

CONDENSATE ASSEMBLY

90° PVC Elbow

(field−provided)

Field−Provided

Vent

5 Feet

Maximum

Condensate Drain

Connection In Unit

Adapter

1/2" slip X 1/2"

NPT

(field−provided)

SLP98UHV with Evaporator Coil

Condensate trap and

evaporator coil must

be drained separately

as shown.

Out

90° PVC Elbow

(field provided)

Drain

Field−Provided Vent

Must Not Interfere With

Service To The Unit

Clean Out

FIGURE 41

4−1/2"

Min.

Drain Trap

Assembly

(furnished)

Cap and Clamp

Field−Provided

Vent

CONDENSATE TRAP LOCATIONS

(Unit shown in horizontal right−hand discharge position)

*5’ max.

PVC Pipe Only

Drain

FIGURE 42

to drain

*Piping from furnace must slope down a minimum of 1/4" per ft. toward trap.

CAUTION

A separate drain line must be run to the drain from the condensate trap. DO NOT connect the condensate trap drain into the drain line from the evaporator coil.

FIGURE 43

Page 52

Page 53

IV−START-UP

A−Preliminary and Seasonal Checks

1 − Inspect electrical wiring, both field and factory installed for

loose connections. Tighten as required.

2 − Check voltage at disconnect switch. Voltage must be

within range listed on the nameplate. If not, consult the power company and have voltage condition corrected before starting unit.

B−Heating Start-Up

FOR YOUR SAFETY READ BEFORE OPERATING

WARNING

Do not use this furnace if any part has been underwater. A flood−damaged furnace is extremely dangerous. Attempts to use the furnace can result in fire or explosion. Immediately call a qualified service technician to inspect the furnace and to replace all gas controls, control system parts, and electrical parts that have been wet or to replace the furnace, if deemed necessary.

WARNING

Danger of explosion. Can cause injury or product or property damage. Should the gas supply fail to shut off or if overheating occurs, shut off the gas valve to the furnace before shutting off the electrical supply.

CAUTION

Before attempting to perform any service or maintenance, turn the electrical power to unit OFF at disconnect switch.

Priming Condensate Trap

The condensate trap should be primed with water prior to start−up to ensure proper condensate drainage. Either pour 10 fl. oz. (300 ml) of water into the trap, or follow these steps to prime the trap:

1 − Follow the lighting instructions to place the unit into op-

eration.

2 − Set the thermostat to initiate a heating demand.

3 − Allow the burners to fire for approximately 3 minutes. 4 − Adjust the thermostat to deactivate the heating de-

mand.

5 − Wait for the combustion air inducer to stop. Set the ther-

mostat to initiate a heating demand and again allow the burners to fire for approximately 3 minutes.

6 − Adjust the thermostat to deactivate the heating demand

and again wait for the combustion air inducer to stop. At this point, the trap should be primed with sufficient water to ensure proper condensate drain operation.

BEFORE PLACING THE UNIT INTO OPERATION, the unit, smell all around the furnace area for gas. Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor.

The gas valve on the SLP98UHV is equipped with a gas control switch. Use only your hand to move the control switch. Never use tools. If the switch will not move by hand, do not try to repair it. Force or attempted repair may result in a fire or explosion.

Placing the furnace into operation:

SLP98UHV units are equipped with an automatic ignition system. Do not attempt to manually light burners on this furnace. Each time the thermostat calls for heat, the burners will automatically light. The ignitor does not get hot when there is no call for heat on units with this ignition system.

WARNING

If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or death.

Gas Valve Operation (Figure 44)

1 − STOP! Read the safety information at the beginning of

this section.

2 − Set the thermostat to the lowest setting.

3 − Turn off all electrical power to the unit.

4 − This furnace is equipped with an ignition device which

automatically lights the burners. Do not try to light the burners by hand.

5 − Remove the upper access panel.

6 − Move the gas valve switch to the OFF position. See

figure 44.

7 − Wait five minutes to clear out any gas. If you then smell

gas, STOP! Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions. If you do not smell gas go to next step.

NEGATIVE AIR

PRESSURE PORT

INLET

SUPPLY

PRESSURE

TAP

GAS VALVE SHOWN IN THE ON POSITION

FIGURE 44

POSITIVE AIR

PRESSURE PORT

OUTLET

MANIFOLD

PRESSURE TAP

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8 − Move gas valve switch to the ON position. See figur e 44.

Do not force.

9 − Replace the upper access panel.

10− Turn on all electrical power to to the unit.

11− Set the thermostat to desired setting.

NOTE − When unit is initially started, steps 1 through 11 may need to be repeated to purge air from gas line.

12− If the appliance will not operate, follow the instructions

Turning Off Gas to Unit" and call your service technician or gas supplier.

Turning Off Gas to Unit

1 − Set the thermostat to the lowest setting. 2 − Turn off all electrical power to the unit if service is to be

performed.

3 − Remove the upper access panel. 4 − Move the gas valve switch to the OFF position. 5 − Replace the upper access panel.

Failure To Operate

If the unit fails to operate, check the following: 1 − Is the thermostat calling for heat? 2 − Are access panels securely in place? 3 − Is the main disconnect switch closed? 4 − Is there a blown fuse? 5 − Is the filter dirty or plugged? Dirty or plugged filters will

cause the limit control to shut the unit off. 6 − Is gas turned on at the meter? 7 − Is the manual main shut-off valve open? 8 − Is the gas valve turned on? 9 − Is the unit ignition system in lock out? If the unit locks out

again, inspect the unit for blockages. 10 − Is blower harness connected to integrated control? Fur-

nace will not operate unless harness is connected.

C−Safety or Emergency Shutdown

Turn off unit power. Close manual and main gas valves.

D−Extended Period Shutdown

Turn off thermostat or set to UNOCCUPIED" mode. Close all gas valves (both internal and external to unit) to guarantee no gas leak into combustion chamber. Turn off power to unit. All access panels and covers must be in place and secured.

V−HEATING SYSTEM SERVICE CHECKS

A−CSA Certification

All units are CSA design certified without modifications. Refer to the SLP98UHV Installation Instruction.

B−Gas Piping

CAUTION

If a flexible gas connector is required or allowed by the authority that has jurisdiction, black iron pipe shall be installed at the gas valve and extend outside the furnace cabinet. The flexible connector can then be added between the black iron pipe and the gas supply line.

WARNING

Do not exceed 600 in−lbs (50 ft−lbs) torque when attaching the gas piping to the gas valve.

Gas supply piping should not allow more than 0.5"W.C. drop in pressure between gas meter and unit. Supply gas pipe must not be smaller than unit gas connection.

Compounds used on gas piping threaded joints should be resistant to action of liquefied petroleum gases.

C−Testing Gas Piping

IMPORTANT

In case emergency shutdown is required, turn off the main shut-off valve and disconnect the main power to unit. These controls should be properly labeled by the installer.

When pressure testing gas lines, the gas valve must be disconnected and isolated. Gas valves can be damaged if subjected to more than 0.5psig (14" W.C.). See figure 45.

MANUAL MAIN SHUT−OFF

VALVE WILL NOT HOLD

NORMAL TEST PRESSURE

1/8" N.P.T. PLUGGED TAP

CAP

FIGURE 45

When checking piping connections for gas leaks, use preferred means. Kitchen detergents can cause harmful corrosion on various metals used in gas piping. Use of a specialty Gas Leak Detector is strongly recommended. It is available through Lennox under part number 31B2001. See Corp. 8411−L10, for further details.

Do not use matches, candles, flame or any other source of ignition to check for gas leaks.

D−Testing Gas Supply Pressure

When testing supply gas pressure, connect test gauge to supply pressure tap on the gas valve. See figure 44. Check gas line pressure with unit firing at maximum rate. Low pressure may result in erratic operation or underfire. High pressure can result in permanent damage to gas valve or overfire. See table 25 for operating pressure at unit gas connection (line).

On multiple unit installations, each unit should be checked separately, with and without units operating. Supply pressure must fall within range listed in table 25.

TABLE 25

All SLP98UHV Units Natural LP

Line Pressure WC" 4.5 − 10.5 11.0 − 13.0

E−Check Manifold Pressure

To correctly measure manifold pressure, the differential pressure between the positive gas manifold and the negative burner box must be considered. Use pressure test

FURNACE

ISOLATE

GAS VALVE

Page 54

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adapter kit (available as Lennox part 10L34) to assist in

measurement.

1 − Connect test gauge +" connection to manifold pres sure tap on the gas valve.

2 − Tee into the gas valve regulator vent hose and connect test gauge −" connection.

3 − Start unit on low heat (35% rate) and allow 5 minutes for unit to reach steady state.

4 − While waiting for the unit to stabilize, notice the flame. Flame should be stable and should not lift from burner. Natural gas should burn blue.

5 − After allowing unit to run for 5 minutes, record manifold pressure and compare to value given in table 29.

6 − Repeat steps 3, 4 and 5 on high fire.

CAUTION

Do not attempt to make adjustments to the gas valve.

F− Proper Gas Flow (Approximate)

TABLE 26

GAS METER CLOCKING CHART

Seconds for One Revolution

SLP98

Unit

−70 55 110 136 272

−90 41 82 102 204

−110 33 66 82 164

−135 27 54 68 136

Natural−1000 btu/cu ft LP−2500 btu/cu ft

Furnace should operate at least 5 minutes before checking

gas flow. Determine time in seconds for two revolutions of

gas through the meter. (Two revolutions assures a more

accurate time.) Divide by two and compare to time in

table 26 below. If manifold pressure matches table 29 and

rate is incorrect, check gas orifices for proper size and re-

striction.

NOTE − To obtain accurate reading, shut off all other gas ap-

pliances connected to meter.

Natural LP

1 cu ft

Dial

2 cu ft

Dial

1 cu ft

Dial

2 cu ft

DIAL

G− Proper Combustion

Furnace should operate minimum 15 minutes with correct manifold pressure and gas flow rate before checking combustion. Take combustion sample beyond the flue outlet and compare to the tables below. The maximum carbon

monoxide reading should not exceed 50 ppm.

H− High Altitude

NOTE − In Canada, certification for installations at elevations over 4500 feet (1372 m) is the jurisdiction of local authorities.

SLP98UHV units require no manifold pressure adjustments for operation at altitudes up to 10,000 feet (3048m) above sea level. Units installed at altitude of 7,501 to 10,000 feet (2287 to 3048m) require a pressure switch change per table

29. Table 29 lists conversion kit requirements, pressure switch requirements and manifold pressures at all altitudes.

NOTE − The values given in table are measurements only. The gas valve should not be adjusted.

The combustion air pressure switch is factory−set and requires no adjustment.

NOTE − A natural to L.P. propane gas changeover kit is necessary to convert this unit. Refer to the changeover kit installation instruction for the conversion procedure.

TABLE 27

High Fire

SLP98UHV Unit CO2%

For Nat

CO2%

For L.P.

36B−070

36C−090

60C−090

7.5 − 8.5 9.0 − 10.0

60C−110

60D−135

The maximum carbon monoxide reading should not exceed 50 ppm.

TABLE 28

Low Fire

SLP98UHV Unit CO2%

For Nat

CO2%

For L.P.

36B−070

36C−090

60C−090

5.2 − 6.2 6.7 − 7.7

60C−110

60D−135

The maximum carbon monoxide reading should not exceed 50 ppm.

Page 55

Page 56

TABLE 29

Conversion Kit Requirements and Manifold Test Pressures

Model

Input

Size

−070

−090

−110

−135

LP/Propane

Kit

0 − 10,000

(0 − 3048 m)

65W77 Not required 70W90 0.4 − 0.6 1.2 − 1.8 3.2 − 3.8 9.5 − 10.5 0.0625 0.034

High Altitude Pressure

Switch Kit

0 − 7,500

(0 − 2286 m)

7,501 − 10,000

(2287 −

3048m)

Manifold Pressure at All Altitudes (in. w.g.)

Low Fire

(35% rate)

Natural Gas LP/Propane Natural Gas LP/Propane Nat LP

High Fire

(100% rate)

NOTE − The values given in table are measurements only. The gas valve should not be adjusted.

VI−TYPICAL OPERATING CHARACTERISTICS

A−Blower Operation and Adjustment

1 − Blower operation is dependent on thermostat control

system.

2 − Generally, blower operation is set at thermostat subbase

fan switch. With fan switch in ON position, blower oper-

ates continuously. With fan switch in AUTO position,

blower cycles with demand or runs continuously while

heating or cooling circuit cycles.

3 − Depending on the type of indoor thermostat, blower and

entire unit will be off when the system switch is in OFF

position.

B−Temperature Rise

Temperature rise for SLP98UHV units depends on unit input, blower speed, blower horsepower and static pressure as marked on the unit rating plate. The blower speed must be set for unit operation within the range of TEMP. RISE °F" listed on the unit rating plate.

To Measure Temperature Rise:

1 − Place plenum thermometers in the supply and return air

plenums. Locate supply air thermometer in the first hori-

zontal run of the plenum where it will not pick up radiant

heat from the heat exchanger.

2 − Set thermostat for heat call. Unit must operate on sec-

ond−stage heat. If using a single−stage thermostat fur-

nace must fire at least 10 minutes before switching to

second−stage heat.

3 − After plenum thermometers have reached their highest

and steadiest readings, subtract the two readings. The difference should be in the range listed on the unit rating plate. If the temperature is too low, decrease blower speed. If temperature is too high, first check the firing rate. Provided the firing rate is acceptable, increase blower speed to reduce temperature.

C−External Static Pressure

1 − Tap locations shown in figure 46. 2 − Punch a 1/4" diameter hole in

supply and return air plenums. Insert manometer hose flush with inside edge of hole or insulation. Seal around the hose with permagum. Connect the zero end of the manometer to the discharge (supply) side of the system. On ducted systems, connect the other end of manometer to the return duct as above.

3 − With only the blower motor running and the evaporator

coil dry, observe the manometer reading. Adjust blower motor speed to deliver the air desired according to the job requirements.

4 − External static pressure drop must not be more than

0.8" W.C. in the heating mode and must not exceed 1.0" W.C in the cooling mode.

5 − Seal the hole when the check is complete.

Gas Orifice Size

STATIC PRESSURE TEST

−

FIGURE 46

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Page 57

VII−MAINTENANCE

WARNING

ELECTRICAL SHOCK, FIRE,

OR EXPLOSION HAZARD.

Failure to follow safety warnings exactly could result in dangerous operation, serious injury, death or property damage. Improper servicing could result in dangerous operation, serious injury, death, or property damage. Before servicing, disconnect all electrical power to furnace. When servicing controls, label all wires prior to disconnecting. Take care to reconnect wires correctly. Verify proper operation after servicing.

At the beginning of each heating season, system should be

checked as follows by a qualified service technician:

Blower

Check the blower wheel for debris and clean if necessary.

The blower motors are prelubricated for extended bearing

life. No further lubrication is needed.

WARNING

The blower access panel must be securely in place when the blower and burners are operating. Gas fumes, which could contain carbon monoxide, can be drawn into living space resulting in personal injury or death.

Filters

All SLP98UHV filters are installed external to the unit. Fil-

ters should be inspected monthly. Clean or replace the fil-

ters when necessary to ensure proper furnace operation.

All SLP98UHV units use a 16 x 25 x1 filter.

Exhaust and air intake pipes

Check the exhaust and air intake pipes and all connections

for tightness and to make sure there is no blockage.

NOTE − After any heavy snow, ice or frozen fog event the

furnace vent pipes may become restricted. Always check

the vent system and remove any snow or ice that may be

obstructing the plastic intake or exhaust pipes.

Electrical

1 − Check all wiring for loose connections. 2 − Check for the correct voltage at the furnace (furnace

operating).

3 − Check amp−draw on the blower motor.

Motor Nameplate__________Actual__________

Winterizing and Condensate Trap Care

1 − Turn off power to the unit.

2 − Have a shallow pan ready to empty condensate water.

3 − Remove the drain plug from the condensate trap and

empty water. Inspect the trap then reinstall the drain plug and refill trap with water.

Cleaning Heat Exchanger

If cleaning the heat exchanger becomes necessary, follow the below procedures and refer to figure 1 when disassembling unit. Use papers or protective covering in front of furnace while removing heat exchanger assembly.

1 − Turn off electrical and gas supplies to the furnace. 2 − Remove the furnace access panels. 3 − Disconnect the 2−pin plug from the gas valve. 4 − Remove gas supply line connected to gas valve. Re-

move the burner box cover and remove gas valve/ manifold assembly.

5 − Remove sensor wire from sensor. Disconnect 2-pin

plug from the ignitor. 6 − Disconnect wires from flame roll−out switches. 7 − Remove four burner box screws at the vestibule panel

and remove burner box. Set burner box assembly

aside.

NOTE − If necessary, clean burners at this time. Follow

procedures outlined in Burner Cleaning section.

8 − Loosen the clamps to the flexible exhaust coupling. 9 − Disconnect condensate drain line from the cold end

header box. 10 − Disconnect condensate drain tubing from flue collar.

Remove screws that secures the flue collar into place.

Remove flue collar. It may be necessary to cut the exit-

ing exhaust pipe for removal of the fitting. 11 − Mark and disconnect all combustion air pressure tub-

ing from cold end header collector box. 12 − Mark and remove wires from pressure switches. Re-

move pressure switches. Keep tubing attached to

pressure switches. 13 − Disconnect the 4-pin plug from the combustion air in-

ducer. Remove two screws which secure combustion

air inducer to collector box. Remove combustion air in-

ducer assembly. Remove ground wire from vest panel. 14 − Remove cold end header box. 15 − Remove electrical junction box from the side of the fur-

nace. 16 − Mark and disconnect any remaining wiring to heating

compartment components. Disengage strain relief

bushing and pull wiring and bushing through the hole in

the blower deck. 17 − Remove the primary limit from the vestibule panel. 18 − Remove two screws from the front cabinet flange at the

blower deck. Spread cabinet sides slightly to allow

clearance for removal of heat exchanger. 18 − Remove screws along vestibule sides and bottom

which secure vestibule panel and heat exchanger as-

sembly to cabinet. Remove two screws from blower rail

which secure bottom heat exchanger flange. Remove

heat exchanger from furnace cabinet. 19 − Back wash heat exchanger with soapy water solution

or steam. If steam is used it must be below 275°F

(135°C) .

20 − Thoroughly rinse and drain the heat exchanger. Soap

solutions can be corrosive. Take care to rinse entire as-

sembly.

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21 − Reinstall heat exchanger into cabinet making sure that

the clamshells of the heat exchanger assembly are resting in the support located at the rear of the cabinet. Remove the indoor blower to view this area through the blower opening.

22 − Re-secure the supporting screws along the vestibule

sides and bottom to the cabinet. 23 − Reinstall cabinet screws on front flange at blower deck. 24 − Reinstall the primary limit on the vestibule panel. 25 − Route heating component wiring through hole in blow-

er deck and reinsert strain relief bushing. 26 − Reinstall electrical junction box. 27 − Reinstall the cold end header box. 28 − Reinstall the combustion air inducer. Reconnect the

4−pin plug to the wire harness. 29 − Reinstall pressure switches and reconnect pressure

switch wiring. 30 − Carefully connect combustion air pressure switch

hosing from pressure switches to proper stubs on

cold end header collector box. 31 − Reconnect condensate drain line to the cold end head-

er box. 32 − Use securing screws to reinstall flue collar to the top

cap on the furnace. Reconnect exhaust piping and ex-

haust drain tubing. 33 − Replace flexible exhaust adapter on combustion air in-

ducer and flue collar. Secure using two existing hose

clamps. 34 − Reinstall burner box assembly in vestibule area. 35 − Reconnect flame roll−out switch wires. 36 − Reconnect sensor wire and reconnect 2−pin plug from

ignitor. 37 − Secure burner box assembly to vestibule panel using

four existing screws. Make sure burners line up in

center of burner ports.

38 − Reinstall gas valve manifold assembly. Reconnect gas

supply line to gas valve. 39 − Reinstall burner box cover. 40 − Reconnect 2−pin plug to gas valve.

41 − Replace the blower compartment access panel. 42 − Refer to instruction on verifying gas and electrical con-

nections when re−establishing supplies.

43 − Follow lighting instructions to light and operate furnace

for 5 minutes to ensure that heat exchanger is clean and dry and that furnace is operating properly.

44 − Replace heating compartment access panel.

Cleaning the Burner Assembly

1 − Turn off electrical and gas power supplies to furnace.

Remove upper and lower furnace access panels. 2 − Disconnect the 2−pin plug from the gas valve. 3 − Remove the burner box cover. 4 − Disconnect the gas supply line from the gas valve. Re-

move gas valve/manifold assembly. 5 − Mark and disconnect sensor wire from the sensor. Dis-

connect 2-pin plug from the ignitor at the burner box. 6 − Remove four screws which secure burner box assem-

bly to vest panel. Remove burner box from the unit. 7 − Use the soft brush attachment on a vacuum cleaner to

gently clean the face of the burners. Visually inspect

the inside of the burners and crossovers for any block-

age caused by foreign matter. Remove any blockage. 8 − Reconnect the sensor wire and reconnect the 2−pin

plug to the ignitor wiring harness. 9 − Reinstall the burner box assembly using the existing

four screws. Make sure that the burners line up in the

center of the burner ports. 10 − Reinstall the gas valve manifold assembly. Reconnect

the gas supply line to the gas valve. Reinstall the burn-

er box cover. 11 − Reconnect 2−pin plug to gas valve. 12 − Replace the blower compartment access panel. 13 − Refer to instruction on verifying gas and electrical con-

nections when re−establishing supplies. 14 − Follow lighting instructions to light and operate furnace

for 5 minutes to ensure that heat exchanger is clean

and dry and that furnace is operating properly. 15 − Replace heating compartment access panel.

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Page 59

VIII− Wiring and Sequence of Operation

NOTE − The thermostat selection DIP switch on the control is factory−set in the TWO−STAGE" position.

Applications Using a Two−Stage Thermostat A − Heating Sequence −− Control Thermostat Selection DIP switch in Variable Capacity" Position

1. On a call for heat, thermostat first−stage contacts close

sending a signal to the integrated control. The integrated control runs a self-diagnostic program and checks high temperature limit switches for normally closed contacts and pressure switches for normally open contacts.The combustion air inducer is energized at ignition speed, which is approximately the same as the inducer speed at 70 percent firing rate.

2. Once the control receives a signal that the low−fire

pressure switch has closed, the combustion air inducer begins a 15−second pre−purge in ignition speed.

3. After the pre−purge is complete, a 20−second initial ig-

nitor warm−up period begins. The combustion air inducer continues to operate at the ignition speed.

4 − After the 20−second warm−up period has ended, the gas

valve is energized and ignition occurs. At the same time, the control module begins an indoor blower 45−second ON−delay. When the delay ends, the indoor blower motor is energized at a speed that matches the firing rate. After the 10−second ignition stabilization delay expires, the inducer speed is adjusted to the appropriate target rate. If the furnace is operating in the initial heating cycle after power−up, the initial firing rate will be approximately 35 percent. The firing rate on subsequent cycles will be automatically adjusted by the integrated control based on thermostat cycles. The firing rate will vary and will range from 40 percent to 90 percent. The furnace will continue this operation as long as the thermostat has a first−stage heating demand.

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5 − If second−stage heat is required, the thermostat sec-

ond−stage heat contacts close and send a signal to the integrated control. The integrated control either increases the firing rate to 70 percent (if the current rate is at or below 60 percent) or increases the firing rate by 10 percent (if the current rate is above 60 percent). If the call for heat continues 5 minutes beyond this initial upstage, the rate will be increased by 10 percent every 5 minutes until the call for heat is satisfied or the furnace reaches 100 percent rate. As the firing rate increases, the indoor blower motor is adjusted to a speed which is appropriate for the target rate.

6 − If second−stage heat demand is satisfied, but first stage

is still present, the furnace will continue to operate at the present firing rate until the heat cycle ends.

7 − When the demand for first− and second−stage heat is

satisfied, the gas valve is de−energized and the field− selected indoor blower off delay begins. The combustion air inducer begins a 20−second post−purge period.

8 − When the combustion air post−purge period is com-

plete, the inducer is de−energized. The indoor blower is de−energized at the end of the off delay.

Applications Using A Single−Stage Thermostat

B − Heating Sequence −− Control Thermostat Selection DIP switch in Single−Stage" Position

1. On a call for heat, thermostat first−stage contacts close sending a signal to the integrated control. The integrated control runs a self-diagnostic program and checks high temperature limit switches for normally closed contacts and pressure switches for normally open contacts. The combustion air inducer is energized at the ignition speed, which is approximately the same as the inducer speed at 70 percent firing rate.

2. Once the control receives a signal that the low−fire pressure switch has closed, the combustion air inducer begins a 15−second pre−purge at the ignition speed.

3. After the pre−purge is complete, a 20−second initial ignitor warm−up period begins. The combustion air inducer continues to operate at the ignition speed.

4 − After the 20−second warm−up period has ended, the gas

valve is energized and ignition occurs, which initiates a 10−second ignition stabilization delay. At the same time, the control module sends a signal to begin an indoor blower 45−second ON−delay. When the delay ends, the indoor blower motor is energized at a speed which is appropriate for the firing rate. After the 10−second ignition stabilization delay expires, the inducer speed is adjusted to 40 percent speed. The integrated control also initiates a second−stage on delay (factory−set at 7 minutes; adjustable to 12 minutes).

5 − If the heating demand continues beyond the second−

stage on delay, the integrated control energizes the combustion air inducer at 70 percent speed. The indoor blower motor is adjusted to a speed which matches the target rate. A fixed, 10−minute third−stage on delay is initiated.

6 − If the heating demand continues beyond the third−

stage on delay, the integrated control energizes the inducer at high speed. The indoor blower motor is adjusted to a speed which is appropriate for the target rate.

7 −When the thermostat heating demand is satisfied, the

gas valve is de−energized and the combustion air inducer begins a 20−second post−purge. The field−selected indoor blower off delay begins.

8 − When the combustion air post−purge period is com-

plete, the inducer is de−energized. The indoor blower is de−energized at the end of the off delay.

Applications Using a Two−Stage Thermostat

C − Heating Sequence −− Control Thermostat Selection DIP switch in Two−Stage" Position (Factory Setting)

1. On a call for heat, thermostat first−stage contacts close sending a signal to the integrated control. The integrated control runs a self-diagnostic program and checks high temperature limit switches for normally closed contacts and pressure switches for normally open contacts. The combustion air inducer is energized at ignition speed, which is approximately the same as the inducer speed at 70 percent firing rate.

2. Once the control receives a signal that the low−fire pressure switch has closed, the combustion air inducer begins a 15−second pre−purge at the ignition speed.

3. After the pre−purge is complete, a 20−second initial ignitor warm−up period begins. The combustion air inducer continues to operate at the ignition speed.

4 − After the 20−second warm−up period has ended, the gas

valve is energized and ignition occurs. At the same time, the control module sends a signal to begin an indoor blower 45−second ON−delay. When the delay ends, the indoor blower motor is energized at a speed that matches the firing rate. After the 10−second ignition stabilization delay expires, the inducer speed is adjusted to the appropriate target rate. The inducer will remain at the 70 percent speed as long as the thermostat has a first−stage heating demand.

5 − If second−stage heat is required, the thermostat sec-

ond−stage heat contacts close and send a signal to the integrated control. The integrated control initiates a 30−second second−stage recognition delay.

6 − At the end of the recognition delay and on all subse-

quent calls for heat in the same heating cycle, the integrated control energizes the combustion air inducer at high speed. The control also checks the high−fire pressure switch to make sure it is closed. As the inducer speed is increased to high, the indoor blower motor is adjusted to a speed which is appropriate for the target rate.

7 − When the demand for high−fire (second stage) heat is

satisfied, the gas valve is de−energized and the field− selected indoor blower off delay begins. The combustion air inducer begins a 20−second post−purge period.

8 − When the combustion air post−purge period is com-

plete, the inducer is de−energized. The indoor blower is de−energized at the end of the off delay.

Page 60

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A − Sequence of Operation and Troubleshooting Flow Chart

IGNITION AND CALL FOR LOW FIRE WITH TWO−STAGE THERMOSTAT

Safety Check

Verify There

Is No Main Burner

Flame

Limit

Switch

Closed?

YES

Rollout Circuit

L I G H T

O F F

Closed?

YES

Low

Pressure

Switch Open?

YES

De−Energize

Gas Valve

De−Energize

Gas Valve

Error Code Flashes

After 5 Seconds

Low Pressure Switch Opens

Combustion Air

(100% rate speed)

Combustion Air Inducer

On (100% rate

Indoor Blower

Inducer On

speed)

ON (70%)

High

Pressure

Switch Open?

YES

Indoor blower OFF Heat OFF Delay

(Low Heat Speed)

Error Code

Flashes

Error Code

Flashes

After

Indoor Blower

ON (100%)

Error Code Flashes

After 5 Seconds

High Pressure Switch Opens

Rollout Circuit

Closes?

YES

Limit

Closes Within 3

Minutes?

YES

Combustion Air

Inducer OFF

After Post−Purge

Indoor Blower OFF After

Heat OFF Delay

Hard Lockout:

Error Code

Flashes

flashes

Indoor Blower OFF After Heat OFF Delay (High Heat Speed)

Soft Lockout:

Error Code

Flashes

C A L L

Ignition Trial Begins

F O R

1 S T

S T A G E

H E A T

Combustion Air Inducer

ON at 70% Rate Speed

Pressure Switch

Closed Within 150

Seconds?

Pre−Purge

15 Seconds

Ignitor ON 20 Seconds

Gas Valve Energized

(Ignitor ON)

Flame

Sensed Within

4 seconds?

Ignitor OFF

Wait For Ignition

Stabilization Delay

Set Target Firing Rate Based on Thermostat

Signals Present

Low

YES

Indoor Blower Delay

YES

Timer Started

Pressure Switch

Calibration

Gas Valve

De−energized

Ignitor OFF

Call

For

YES

Calibration

Successful?

Wait

5 minutes

Interpurge

(15 Seconds)

5th

Unsuccessful

Trial?

SOF T LOCKOU T IS RESE T AUTOMATICALLY AFTER ONE HOUR WITH A CALL FOR HE AT ACTIVE, OR B Y CYCLING THE CALL FOR HE AT, OR B Y CYCLING POWER TO THE CONTROL.

HARD LOCKOU T IS RESE T BY CYCLING POWER TO THE CONTROL.

Calibrations

Attempted?

YES

Post−Purge

(20Seconds)

YES

Soft Lockout:

Error Code

Flashes

Combustion Air

Inducer OFF

Heat?

YES

Soft Lockout:

Error Code

Flashes

Call For

Indoor blower OFF After Heat OFF Delay

Heat

Ends?

YES

Indoor

Blower

ON?

YES NO

Call For 2nd Stage Heat Call For Heat Satisfied

3A2

Page 61

Page 62

CALL FOR HIGH FIRE WITH TWO−STAGE THERMOSTAT

2 Stage

Thermostat

1st Call for High

Fire?

YES

2nd Stage

Recognition Delay

(30 Seconds)

Combustion Air Inducer ON

(100% Rate Speed)

High

Pressure Switch

Closes Within 10 Seconds?

YES

Adjust Indoor

Blower to

Appropiate speed

Wait for Call for Heat Satisfied

Increase Combustion

Air Inducer Speed

if Not at 100%

Rate Speed

Error Code

Flashes

Wait 5

Minutes

System will always light at 70% even if 2nd stage call for heat is in place

If the high pressure switch does not close within 5 attempts, the system will operate at low fire for the remainder of the call for heat at request

Page 62

Page 63

CALL FOR HEAT SATISFIED

RUN MODE (2 STAGE THEREMOSTAT) 1ST OR 2ND STAGE CALL FOR HEAT ALL INPUTS MONITORED (LIMIT, PRESSURE, CALL FOR HEAT / COOL, FLAME LEVEL)

2nd Stage Heat

1st Stage Heat

3A 3B

2nd Stage

Call for Heat

satisfied?

YES

Combustion Air Inducer

switched to 70% rate speed

Adjust Indoor Blower

to appropiate speed

RUN MODE (SINGLE STAGE THERMOSTAT) ALL INPUTS MONITORED (LIMIT, PRESSURE, CALL FOR HEAT / COOL, FLAME LEVEL)

1st Stage

Call for Heat

satisfied?

Gas valve

De−Energized

Combustion Air Inducer OFF

after 20−Second Post Purge

Indoor Blower OFF

after OFF Delay

1 4

Wait for Call −

2−StageThermostat

YES

Wait for Call −

Single StageThermostat

Page 63

Page 64

L I G H T

O F F

Safety Check

Verify There

Is No Main Burner

Flame

Limit

Switch

Closed?

YES

Rollout

Circuit

Closed?

YES

Low

Pressure

Switch

Open?

YES

IGNITION AND CALL FOR LOW FIRE WITH SINGLE−STAGE THERMOSTAT

Indoor Blower OFF After

De−Energize

Gas Valve

De−Energize

Gas Valve

Error Code Flashes

After 5 Seconds

Low Pressure Switch Opens

Heat OFF Delay (Low Heat Speed)

Combustion Air

Inducer ON

(100%)

Combustion Air

Inducer ON

(100%)

Indoor Blower

(70%)

High

Pressure

Switch Open?

YES

Error Code

Flashes

Error Code

Flashes

Indoor Blower

(100% Speed)

Error Code Flashes

After 5 Seconds

High Pressure

Switch Opens

YES

Rollout

Circuit

Closes?

Combustion Air Inducer

OFF After Post−Purge

Indoor Blower OFF After

Limit

Closes Within 3

Minutes?

YES

Heat OFF Delay

Hard Lockout:

Error Code

Flashes

flashes

Indoor Blower OFF

After Heat OFF Delay

(High Heat Speed)

Soft Lockout:

Error Code

Flashes

Ignition Trial Begins

C A L L

F O R

H E A T

Combustion Air Inducer ON at

Ignition at 70% rate speed

Low

Pressure Switch

Closed Within 150

Seconds?

YES

Pre−Purge

15 Seconds

Ignitor ON 20 Seconds

Gas Valve Energized

Ignitor ON

Wait For Ignition

Stabilization Delay

Low Firing Rate

Delay Timer Started

Flame

Sensed Within

4 seconds?

YES

Ignitor OFF

Set to

Indoor Blower On

Pressure Switch

Calibration

Gas Valve

De−energized

Ignitor OFF

YES

Calibration

Successful?

Wait

5 minutes

Interpurge

(15 Seconds)

Unsuccessful

Call For

Heat?

Calibrations

Attempted?

5th

Trial?

SOF T LOCKOUT IS RESE T AUTOMATICALLY AFTER ONE HOUR WITH A CALL FOR HEAT ACTIVE, OR BY CYCLING THE CALL FOR HE AT, OR BY CYCLING POWER TO THE CONTROL.

HARD LOCKOUT IS RESE T BY CYCLING POWER TO THE CONTROL.

YES

Post−Purge

(20 Seconds)

YES

Soft Lockout:

Error Code

Flashes

Combustion Air

Inducer OFF

YES

Soft Lockout:

Error Code

Flashes

Call For

Heat

Ends?

YES

Indoor

Blower On?

YES NO

Indoor Blower OFF

After Heat OFF Delay

Move to Mid Firing Rate and High Firing Rate after 2nd and 3rd Stage Delays

(based on DI P Switch selections)

Call For Heat Satisfied

Page 64

Page 65

CALL FOR COOLING

1st Stage Cooling Request Received

Energize 1st Stage

Cooling Contactor

(Compressor & Fan)

Indoor Blower On

After 2−second delay

Energize Indoor Blower

(Per Ramping Profile)

2nd Stage

Cooling

Request?

YES

1st Stage

Cooling Request

Still Active?

YES

Energize 2nd Stage

Cooling Contactor

(Compressor & Fan)

Cooling Request

(Compressor & Fan)

Cooling Request

De−Energize 1st

(Compressor & Fan)

De−Energize Indoor Blower

Per Ramping Profile

YES

Energize Indoor Blower

(High Cooling mode)

2nd Stage

Still Active?

De−Energize 2nd

Stage Cooling

Contactor

1st Stage

Still Active?

Stage Cooling

Contactor

Maintain Indoor Blower

YES

(High Cooling mode)

Maintain Indoor Blower at

Low Cooling mode

Energize and

2nd stage cooling operation requires a 2−stage thermostat, a 2−stage cooling system and jumpers

W915 must be be cut. The control will not respond to a 2nd stage cooling request unless a 1st stage cooling request is active

Indoor blower cooling mode and high cooling mode have a specific ON, OFF and speed ramping

profiles. The specific profile is selected using the DIP switches on the control.

Page 65

Page 66

CONTINUOUS LOW SPEED INDOOR BLOWER SEQUENCE OF OPERATION

Call for

Continuous Blower

Indoor Blower On

(Speed Determined by

Dip Switch settings)

Request for Cooling Received?

Request

for Heat

Received?

Call for Fan

Removed?

YES

De−Energize

Indoor Blower Per

Ramping Profile

Indoor blower low cooling mode and high cooling mode, have specific ON − OFF and speed ramping

YES Go to Call for Cooling

YES

profiles. The specific profile is selected using the dip switches on the control.

Blower at set speed

Maintain Indoor

Go to Call for Heat − 2 Stage

Go to Call for Heat − Single Stage

Thermostat

Page 66

Page 67

IX− Field Wiring

Thermostat

TABLE 30

Field Wiring for Non−Communicating Thermostat Applications

DIP Switch Settings and On−Board Links (figure 4)

DIP Switch 1

W915

(Y1 to Y2)

Two−Stage

Cooling

W914

(DS to R)

Dehumidifi-

cation or

Harmony III

W951

(O to R)

Heat Pumps

Wiring Connections

1Heat / 1 Cool

NOTE − Use DIP switch 3 to set second−stage heat ON delay. OFF−7 minutes. ON−12 minutes.

1 Heat / 2 Cool

NOTE − Use DIP switch 3 to set second−stage heat ON delay. OFF−7 minutes. ON−12 minutes.

ON Intact Intact Intact

ON Cut Intact Intact

T’STAT

CONTROL

TERM. STRIP

CONTROL

TERM. STRIP

OUTDOOR

UNIT

OUTDOOR

UNIT

1 Heat / 2 Cool

ON Cut Cut Intact with t’stat with dehumidification mode

NOTE − Use DIP switch 3 to set second−stage heat ON delay. OFF−7 minutes. ON−12 minutes.

* R" required on some units.

T’STAT

CONTROL

TERM. STRIP

OUTDOOR

UNIT

Page 67

Page 68

TABLE 44

Field Wiring for Non−Communicating Thermostat Applications

DIP Switch Settings and On−Board Links (figure 4)

W914

(DS to R)

Dehumidifi-

cation or

Harmony

W951

(O to R)

Heat Pumps

Thermostat

DIP Switch 1

W915

(Y1 to Y2)

Two−Stage

Cooling

III

2 Heat / 2 Cool OFF Cut Intact Intact

Wiring Connections

T’STAT

CONTROL

TERM. STRIP

OUTDOOR

UNIT

2 Heat / 2 Cool

OFF Cut Cut Intact with t’stat with dehumidification mode

2 Heat / 1 Cool OFF Intact Intact Intact

T’STAT

CONTROL

TERM. STRIP

CONTROL

TERM. STRIP

OUTDOOR

UNIT

OUTDOOR

UNIT

* R" required on some units.

Page 68

Page 69

Thermostat

Dual Fuel Single Stage Heat Pump

ComfortSense 7000 L7724U thermostat w/ dual fuel capabilities Capable of 2 stage gas heat control

TABLE 30

Field Wiring for Non−Communicating Thermostat Applications (Continued)

DIP Switch Settings and On−Board Link (figure 4)

W914

DIP Switch

W915

(Y1 to Y2)

Two−Stage

Cooling

(DS to R)

Dehumidifi-

cation or

Harmony

W951

(O to R)

Heat Pumps

Wiring Connections

III

DIP Switch 1

OFF

Intact Intact Cut

L7724U T’STAT

CONTROL

TERM. STRIP

HEAT PUMP

67M41*

Dual Fuel Two Stage

DIP Switch 1

OFF

Cut Intact Cut

Heat Pump

ComfortSense 7000 L7724U thermostat w/ dual fuel capabilities Capable of 2 stage gas heat control

* Connect W1 to W1 ONLY if using defrost tempering kit 67M41

L7724U T’STAT

CONTROL TERM.

STRIP

67M41*

outdoor

sensor

HEAT PUMP

out blue

outdoor sensor

Page 69

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

Specifications and Main Features

Frequently Asked Questions

User Manual