Lennox SLP98DF090XV60C, SLP98DF110XV60C, SLP98DF090XV36C, SLP98DF090XV48C, SLP98DF070XV36B Handbook

Page 1

Corp. 1030-L7

Service Literature

Revised 05-2016

SLP98DFV SERIES UNITS

SLP98DFV series units are high-efficiency downflow gas furnaces equipped with variable capacity gas valve, vari able speed combustion air inducer and variable speed in door blower motor. All models are designed for direct vent (dual pipe) venting system only. SLP98DFV units are avail able 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. SLP98DFV mod

els include a SureLight

that can be used with Lennox icomfort Wi-Fi

part of a communicating comfort system. All SLP98DFV

units meet the California Nitrogen Oxides (NO

and California Seasonal Efficiency requirements.

variable capacity integrated control

thermostat as

) Standards

SLP98DFV

All specifications in this manual are subject to change. Pro cedures outlined in this manual are presented as recom mendations only and do not supersede or replace local or state codes. In the absence of local or state codes, the guidelines and procedures outlined in this manual (except where noted) are recommendations only and do not consti tute code.

TABLE OF CONTENTS

Specifications Page 2.............................

Optional Accessories Page 3......................

Blower Data Page 4..............................

I Unit Components Page 8........................

II icomfort Wi-Fi

III Placement and Installation Page 35..............

IV Start Up Page 53..............................

V Heating System Service Checks Page 54..........

VI Typical Operating Characteristics Page 57........

VII Maintenance Page 57..........................

VIII Wiring and Sequence of Operation Page 60.....

IX Field Wiring Page 68...........................

Thermostat Page 33..............

WARNING

Improper installation, adjustment, alteration, service or maintenance can cause property damage, person al injury or loss of life. Installation and service must be performed by a licensed professional HVAC in staller (or equivalent), service agency or the gas sup plier.

WARNING

Electric shock hazard. Can cause injury or death. Before attempting to perform any service or maintenance, turn the electrical power to unit OFF at discon nect switch(es). Unit may have multiple power supplies.

CAUTION

As with any mechanical equipment, contact with sharp sheet metal edges can result in personal injury. Take care while handling this equipment and wear gloves and protective clothing.

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Page 2

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.

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

Gas pipe size IPS 1/2 1/2 1/2

Condensate Drain Trap (PVC pipe) - i.d. 3/4 3/4 3/4

with furnished 90° street elbow 3/4 slip x 3/4 Mipt 3/4 slip x 3/4 Mipt 3/4 slip x 3/4 Mipt

with eld supplied (PVC coupling) - o.d. 3/4 slip x 3/4 MPT 3/4 slip x 3/4 MPT 3/4 slip x 3/4 MPT

Indoor

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 3 - 4

Air Volume Range - cfm 410 - 1365 488 - 1385 545 - 1745

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 140 155 165

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. SLP98DF070XV36B SLP98DF090XV36C SLP98DF090XV48C

AFUE 97.5% 97.5% 97.5%

Output - Btuh 64,000 84,000 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

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

Gas Manifold Pressure (in. w.g.)

Nat. Gas / LPG/Propane

Minimum Input - Btuh 31,000 39,000

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

Gas Manifold Pressure (in. w.g.)

Nat. Gas / LPG/Propane

High static - in. w.g. 0.8 0.8

Connections in.

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

Gas pipe size IPS 1/2 1/2

Condensate Drain Trap (PVC pipe) - i.d. 3/4 3/4

with furnished 90° street elbow 3/4 slip x 3/4 Mipt 3/4 slip x 3/4 Mipt

with eld supplied (PVC coupling) - o.d. 3/4 slip x 3/4 MPT 3/4 slip x 3/4 MPT

Indoor

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

Blower

Tons of add-on cooling 3.5 - 5 3.5 - 5

Air Volume Range - cfm 467 - 2130 575 - 2180

Electrical Data Voltage (Maximum Amps) 120 volts - 60 hertz - 1 phase

Blower motor full load amps 12.8 12.8

Maximum overcurrent protection 20 20

Shipping Data lbs. - 1 package 165 174

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. SLP98DF090XV60C SLP98DF110XV60C

AFUE 97.5% 97.5%

Output - Btuh 85,000 107,000

3.5 / 10.0 3.5 / 10.0

Output - Btuh 30,000 38,000

0.5 / 1.5 0.5 / 1.5

Motor output - hp 1 1

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OPTIONAL ACCESSORIES - ORDER SEPARATELY

NOTE - FURNACES CANNOT BE TWINNED!

“B” Width Models “C” Width Models

CABINET ACCESSORIES

Downow Combustible Flooring Base 11M60 11M61

CONDENSATE DRAIN KITS

Condensate Drain Heat Cable 6 ft. 26K68 26K68

24 ft. 26K69 26K69

50 ft. 26K70 26K70

Heat Cable Tape Fiberglass - 1/2 in. x 66 ft. 36G53 36G53

Crawl Space Vent Drain Kit USA (Canada) 51W18 (15Z70) 51W18 (15Z70)

CONTROLS

iComfort Wi-Fi® Thermostat 10F81 10F81

Remote Outdoor Air Sensor (for dual fuel and Humiditrol®) X2658 X2658

Discharge Air Temperature Sensor 88K38 88K38

ComfortSense

Remote Outdoor Temperature Sensor

(for dual fuel and Humiditrol)

DOWNFLOW FILTER KITS

Downow Air Filter and Rack Kit 51W07 51W08

NIGHT SERVICE KITS

Night Service Kit 10U37 10U37

Universal Service Kit - Switches 89W20 89W20

TERMINATION KITS

Direct Vent Applications Only. See Installation Instructions for specic venting information.

Termination Kits Concentric US - 2 in. 71M80 69M29

Roof Termination Flashing Kit (2 ashings) 3 in. 44J41 44J41

VENTING

Left Side Vent Kit 2 or 3 in. 87W73 87W73

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 conven-

tional 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 SureLight® control.

NOTE - The curved exhaust pipe furnished with the Left Side Vent Kit counts as one additional 2 in. diameter 90° elbow. When using 3 in. diameter pipe, the furnished

NOTE - Termination Kits 44W92, 44W93, 30G28, 51W12, 81J20 and Crawl Space Vent Drain Kit 15Z70 are certied to ULC S636 standard for use in Canada only.

7000 Thermostat Y0349 Y0349

X2658 X2658

No. and Size of lter - in. (2) 16 x 20 x 1 (2) 16 x 20 x 1

3 in. - - - 60L46

Canada - 2 in. 44W92 44W92

3 in. - - - 44W93

Flush-Mount US - 2, 2-1/2 or 3 in. 51W11 51W11

Canada - 2, 2-1/2 or 3 in. 51W12 51W12

Wall - Close

Couple

Wall - Close

Couple WTK

US - 2 in. 22G44 - - -

3 in. 44J40 44J40

Canada - 2 in. 30G28 - - -

3 in. 81J20 81J20

Roof 2 in. 15F75 15F75

Wall Ring Kit 2 in. 15F74 15F74

curved exhaust pipe and eld provided ttings to transition from 2 in. to 3 in. count as 20 feet of equivalent pipe on all units.

GAS HEAT ACCESSORIES

Input High Altitude

Pressure Switch Kit

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

All Models 93W75 65W77 70W87

Natural Gas to

LPG/Propane Kit

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LPG/Propane to

Natural Gas Kit

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BLOWER DATA

SLP98DF070V36B BLOWER PERFORMANCE (less lter)

HEATING BLOWER PERFORMANCE

Heating Adjust CFM Selections

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

Increase (+15%) Heat CFM 495 543 639 735 830 926 1022 1118

Increase (+7.5%) Heat CFM 473 516 604 691 778 866 953 1041

Default Heat CFM 450 489 568 647 726 805 884 963

Decrease (-7.5% ) Heat CFM 430 467 540 614 687 761 834 908

Decrease (-15% ) Heat CFM 410 444 512 580 649 717 785 853

COOLING BLOWER PERFORMANCE

Cooling Adjust CFM

Selections

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

Low Medium-

Low

Increase (+10%) Cool CFM 625 785 890 995 910 1075 1230 1365

Default Cool CFM 575 710 830 890 845 960 1125 1265

Decrease (-10%) Cool CFM 520 615 710 820 755 885 985 1150

Heating Input Range and Blower Volume - CFM

Blower Speed Selections

Medium

High

(Default)

Low Medium-

Low

Medium

High

(Default)

SLP98DF090V36C BLOWER PERFORMANCE (less lter)

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 710 756 848 940 1033 1125 1217 1309

Increase (+7.5%) Heat CFM 670 713 799 885 971 1057 1143 1230

Default Heat CFM 629 669 749 829 910 990 1070 1150

Decrease (-7.5% ) Heat CFM 559 599 681 763 845 927 1009 1091

Decrease (-15% ) Heat CFM 488 530 614 697 781 865 948 1032

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 610 770 900 1035 920 1080 1215 1385

Default Cool CFM 545 690 805 920 835 1000 1135 1255

Decrease (-10%) Cool CFM 465 620 720 810 750 890 1025 1145

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 250 cfm.

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

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BLOWER DATA

SLP98DF090V48C BLOWER PERFORMANCE (less lter)

HEATING BLOWER PERFORMANCE

Heating Adjust CFM Selections

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

Increase (+15%) Heat CFM 723 790 925 1060 1195 1329 1464 1599

Increase (+7.5%) Heat CFM 690 752 878 1004 1129 1255 1381 1507

Default Heat CFM 656 714 831 948 1064 1181 1297 1414

Decrease (-7.5% ) Heat CFM 601 654 761 867 974 1081 1188 1295

Decrease (-15% ) Heat CFM 545 593 690 787 884 981 1078 1175

COOLING BLOWER PERFORMANCE

Cooling Adjust CFM

Selections

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

Low Medium-

Low

Increase (+10%) Cool CFM 775 940 1100 1255 1120 1340 1535 1745

Default Cool CFM 690 875 975 1135 1000 1220 1425 1625

Decrease (-10%) Cool CFM 635 755 915 1025 920 1100 1270 1470

Heating Input Range and Blower Volume - CFM

Blower Speed Selections

Medium

High

(Default)

Low Medium-

Low

Medium

High

(Default)

SLP98DF090V60C BLOWER PERFORMANCE (less lter)

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 653 728 877 1027 1176 1326 1475 1625

Increase (+7.5%) Heat CFM 603 673 813 953 1092 1232 1372 1512

Default Heat CFM 553 618 748 878 1009 1139 1269 1399

Decrease (-7.5% ) Heat CFM 510 570 690 811 931 1051 1171 1292

Decrease (-15% ) Heat CFM 467 522 632 743 853 963 1074 1184

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 1110 1265 1395 1600 1600 1750 1965 2130

Default Cool CFM 1000 1145 1275 1445 1445 1625 1805 1975

Decrease (-10%) Cool CFM 885 1060 1145 1265 1265 1445 1645 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 380 cfm (SLP98DF090V48C) and 450 cfm (SLP98DF090V60C).

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BLOWER DATA

SLP98DF110V60C BLOWER PERFORMANCE (less lter)

HEATING BLOWER PERFORMANCE

Heating Adjust CFM Selections

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

Increase (+15%) Heat CFM 811 906 1096 1286 1475 1665 1855 2045

Increase (+7.5%) Heat CFM 744 835 1017 1199 1380 1562 1744 1926

Default Heat CFM 677 764 938 1112 1285 1459 1633 1807

Decrease (-7.5% ) Heat CFM 626 707 869 1031 1193 1355 1517 1679

Decrease (-15% ) Heat CFM 575 650 800 950 1101 1251 1401 1551

COOLING BLOWER PERFORMANCE

Cooling Adjust CFM

Selections

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

Low Medium-

Low

Increase (+10%) Cool CFM 1090 1260 1395 1580 1580 1790 1990 2180

Default Cool CFM 965 1125 1285 1440 1440 1625 1845 2000

Decrease (-10%) Cool CFM 860 1030 1125 1270 1270 1470 1655 1845

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.

Heating Input Range and Blower Volume - CFM

Blower Speed Selections

Medium

High

(Default)

Low Medium-

Low

Medium

High

(Default)

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CONTROL BOX

(includes variable capacity

integrated control,

transformer, circuit breaker

and door switch)

BLOWER

ACCESS

PANEL

SLP98DFV PARTS ARRANGEMENT

BLOWER ASSEMBLY

(Variable Speed Blower

Motor Is Hidden)

BAG ASSEMBLY

ACCESS PANEL

COMBUSTION AIR INDUCER

GAS VALVE

PRIMARY LIMIT

BURNER BOX ASSEMBLY

FIGURE 1

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I-UNIT COMPONENTS

SLP98DFV 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.

CAUTION

Electrostatic discharge can affect elec tronic components. Take precautions to neutralize electrostatic charge by touch ing your hand and tools to metal prior to handling the control.

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

PRESS TO RESET

FIGURE 3

A-Control Box

1. Control Transformer (T1)

A transformer located in the control box provides power to the low voltage section of the unit. Transformers on all mod els are rated 40VA with a 120V primary and a 24V secon dary.

2. Interlock Switch (S51)

An interlock switch rated 14A at 125VAC is wired in series with line voltage. When the inner blower access panel is re moved the unit will shut down.

CONTROL BOX SLP98DFV

SURELIGHT®

DOOR

INTERLOCK

SWITCH

INTEGRATED

CONTROL

CIRCUIT BREAKER

FIGURE 2

TRANSFORMER

WARNING

Shock hazard. Disconnect power before servicing.

Integrated control is not field repairable. If control is inoperable, simply replace entire control.

Can cause injury or death. Unsafe operation will re sult if repair is attempted.

4. Integrated Control (A92)

SLP98DFV units are equipped with the Lennox SureLight variable-capacity integrated control. This control can be used with the icomfort Wi-Fi 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, 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.

thermostat as part of a com

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Electronic Ignition

At the beginning of the heat cycle the SureLight

integrated control monitors the low fire combustion air inducer pres sure switch. The control will not begin the heating cycle if the low fire pressure switch is closed (by-passed). Likewise the control will not begin the high fire heating cycle if the high fire pressure switch is closed, and will remain in low fire heat. However, if the high fire pressure switch closes during the low fire heat pre-purge, the control will allow high fire heat. Once the low fire pressure switch is determined to be open, the combustion air inducer is energized on ignition speed. When the differential in the pressure switch is great enough, the pressure switch closes and a 15-second pre-purge be gins. If the switch is not proven within 2-1/2 minutes, the in ducer is de-energized and the control will initiate vent cal ibration. If the vent calibration is unsuccessful the control goes into a 5 minute delay. The control will attempt vent cal ibration 3 more times before going into a 1 hour soft lockout. After the 15 second pre-purge period the SureLight ignitor warms up for 20 seconds. The gas valve then opens for a 4-second trial for ignition. The ignitor stays energized dur ing 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 (in cluding the initial trial), the control goes into WatchguardFlame Failure mode. After a 60-minute reset period, the control will begin the ignition sequence again.

Thermostat Selection Modes

See table 3 for DIP switch settings

The control can be made to operate in three modes: vari able capacity, three-stage timed or two-stage. The variable capacity and two-stage modes are only operational with a two-stage thermostat. The thermostat selection is made us ing DIP switches one and / or two (figure 4) and must be positioned for the particular application.

Three- Stage Timed Operation

Using a single-stage thermostat the system will operate in a three stage timed mode. Upon a call for heat and a success ful ignition, the combustion air inducer will operate at 35% and the indoor blower will adjust to the appropriate cfm. Af ter a field selectable 7 or 12 minute delay period, the induc er RPM will increase and the unit will operate at 70%. The indoor blower will adjust to the appropriate cfm. After a fac tory set non-adjustable 10 minute delay expires the furnace will increase rate to 100%. The indoor blower will adjust to the appropriate cfm.

Two-Stage Operation

The system will also operate in conventional two-stage mode. While in two-stage mode, the furnace will fire on low fire (70% rate). The combustion air inducer will operate at 70% and the indoor blower will adjust to the appropriate cfm. The unit will switch to high fire on a W2 call from the thermostat. After a 30 second recognition period (during which the integrated control will receive a continuous W2 call) expires the furnace will increase to 100% rate. The in ducer will increase to 100% speed and the indoor blower will adjust to appropriate cfm. If there is a simultaneous call for first and second stage heat, the unit will fire on first stage heat and switch to second stage heat after 30 seconds of operation.

TABLE 1

Control 6 Pin Terminal Designation

SureLight

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 ad justed accordingly to provide the appropriate airflow at any rate. On the initial call for low fire, the furnace will operate at 35% and will remain there until the heat call is satisfied or a call for high fire is initiated. If there is a call for high fire the rate will increase by 10% if the current rate is above 60%. However if the current rate is below 60% the rate will in crease to 70%. After this initial rate increase to 70% capac ity, the furnace will increase rate by 10% every 5 minutes while a high fire heat call is present. If the high fire heat call is satisfied but the low fire heat call is still present, the furnace will remain at the current firing rate until the demand is satis fied or another call for high fire is initiated.

Page 9

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 10

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

TB84 INDOOR

TERMINALS

RS-BUS LINK (TB82, future use)

I+ = DATA HIGH CONNECTION I - = DATA LOW CONNECTION

RS-BUS OUTDOOR (TB83)

R = 24VAC I + = DATA HIGH CONNECTION I - = DATA LOW CONNECTION C = 24VAXC COMMON

RS-BUS INDOOR (TB84)

R = 24VAC I + = DATA HIGH CONNECTION I - = DATA LOW CONNECTION C = 24VAXC COMMON

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 (GRD)

Y1 = THERMOSTAT 1ST STAGE COOL SIGNAL

Y2 = THERMOSTAT 2ND STAGE COOL SIGNAL

O = THERMOSTAT SIGNAL TO HEAT PUMP

REVERSING VALVE

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

H = 24V HUMIDIFIER OUTPUT. DO NOT CONNECT TO COM

FORTSENSE

L = USE ONLY WITH A COMMUNICATING THERMOSTAT AND

A NON-COMMUNICATING OUTDOOR UNIT

DH = DEHUMIDIFICATION OUTPUT

COMMUNICATING THERMOSTAT ONLY

FIGURE 4

Page 10

THERMOSTAT

Page 11

SLP98DFV INTEGRATED CONTROL CONFIGURATION GUIDE

FIGURE 5

Page 11

Page 12

Thermostat Selection Switch Settings

TABLE 3

Operation

Variable Capacity Heat

Thermostat Switch 1 Switch 2 Switch 3

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 SLP98DFV is used with an icomfort

communicating thermostat, all indoor blower

Wi-Fi speed selections and DIP switch settings are made by the communicating thermostat.

Heating Operation DIP Switch Settings -- Figure 4

Switch 1 -- Thermostat Selection -- This unit may be used

with either a single-stage or two-stage thermostat. The ther mostat selection is made using a DIP switch which must be properly positioned for the particular application. The DIP switch is factory-positioned for use with a two-stage thermo stat. If a single-stage thermostat is to be used, the DIP switch must be repositioned. See table 3.

NOTE - All DIP switches are factory shipped in the “OFF” position.

Switch 2 -- Operating Mode with Two-Stage Thermostat

-- If a two-stage thermostat is used, the furnace can operate

in either variable-capacity or conventional two-stage mode. When variable-capacity mode is selected, the firing rate of the unit is varied to maximize comfort. Conventional twostage mode is the factory default setting. See table 3.

Switch 3 -- Second-Stage Heat On Delay -- If a singlestage thermostat is used, the integrated control can be used to energize second-stage heat after either 7 minutes or 12 minutes of first-stage heat operation. See table 3.

Switches 4 and 5 -- Blower-Off Delay -- The blower-on delay of 45 seconds is not adjustable. The blower-off delay (time that the blower operates after the heating demand has been satisfied) can be adjusted by moving switches 4 and 5 on the integrated control. The unit is shipped from the facto ry with a blower-off delay of 90 seconds. The blower off delay affects comfort and is adjustable to satisfy individual applications. Adjust the blower off delay to achieve a supply air temperature between 90° and 110°F at the exact mo ment that the blower is de-energized. Longer off delay set tings provide lower supply air temperatures; shorter set tings provide higher supply air temperatures. Table 4 pro vides the blower off timings that will result from different switch settings.

Blower Off Delay Switch Settings

Blower Off Delay

(Seconds)

60 Off On

90 (factory) Off Off

120 On Off 180 On On

Indoor Blower Operation DIP Switch Settings Switches 6 and 7 -- Continuous Indoor Fan Operation -Blower Speed - Switches 6 and 7 are used to select blower

motor speeds during continuous indoor blower operation. The unit is shipped from the factory with DIP switches posi tioned for medium low (2) speed during continuous indoor blower operation. The table below provides the continuous blower speeds that will result from various switch settings. Refer to blower tables at the front of this manual for corre sponding cfm values.

Continuous Indoor Fan

Speed

1 - Low (28%) Off On

2 - Medium Low

(38%)

(Factory)

3 - Medium High

(70%)

4 - High (100%) On On

Switches 8 and 9 -- Cooling Mode Blower Speed --

Switches 8 and 9 are used to select cooling blower motor speed. The unit is shipped from the factory with the DIP switches positioned for high speed (4) indoor blower motor operation during the cooling mode. The table below pro vides the cooling mode blower speeds that will result from different switch settings. Refer to blower tables at the front of this manual for corresponding cfm values.

Cooling Mode Blower Speeds

Speed

1 - Low On On

2 - Medium Low Off On

3 - Medium High On Off

4 - High (Factory) Off Off

TABLE 4

Switch 4 Switch 5

TABLE 5

Switch 6 Switch 7

Off Off

On Off

TABLE 6

Switch 8 Switch 9

Page 12

Page 13

Switches 10 and 11 -- Cooling Mode Blower Speed Ad justment -- Switches 10 and 11 are used to select blower

speed adjustment settings. The unit is shipped from the fac tory with the DIP switches positioned for NORMAL (no) ad justment. The DIP switches may be positioned to adjust the blower speed by +10% or -10% to better suit the application. The table below provides blower speed adjustments that will result from different switch settings. Refer to blower tables at the front of this manual for corresponding cfm val ues. With switches 10 and 11 set to ON, motor will bypass ramping profiles and all delays and immediately upon a call for cool, run at COOLING speed selected. LED will continue to operate as normal. This mode is used to check motor op eration.

TABLE 7

Blower Speed Adjustment

Adjustment

Switch 10 Switch 11

+10% (approx.) On Off

NORMAL (Factory) Off Off

-10% (approx.) Off On MOTOR TEST On On

Ramping Option A (Factory Selection)

D Motor runs at 50% for 30 seconds. D Motor then runs at 82% for approximately 7-1/2 min

utes.

D If demand has not been satisfied after 7-1/2 minutes,

motor runs at 100% until demand is satisfied.

D 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, mo tor 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 ramp ing may be used to enhance dehumidification performance. The switches are factory set at option A which has the great est effect on blower motor performance. Table 8 provides the cooling mode blower speed ramping options that will re sult from different switch settings. The cooling mode blower speed ramping options are detailed below.

TABLE 8

Cooling Mode Blower Speed Ramping

Ramping Option

Switch 12 Switch 13

A (Factory) Off Off

B On Off C Off On D On On

Ramping Option 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 13

Page 14

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 MIDRANGE HEAT demand and 35% of normal speed during LOW HEAT demand. Switches 14, 15 and 16 are used to adjust the LOW FIRE blower motor speed. Switches 17, 18 and 19 are used to adjust the HIGH FIRE blower motor speed. Figure 6 and tables 9 and 10 provides the heating mode blower speeds that will result from different switch settings. Figure 6 indicates the effect the DIP switch set tings (tables 20 &21 above) have upon the heating airflow at various furnace firing rates. Refer to blower tables at the front of this manual for corre sponding cfm values.

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

S Identify blower speed adjustment points at low and high fire S 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%

Dip Switches

90%

High Fire

17, 18, 19

+15%

+7.5%

Nominal

-7.5%

-15%

100%

Page 14

Page 15

On-Board Link W914 DS to R (Figure 4)

On-board link W914, is a clippable connection between ter minals DS and R on the integrated control. W914 must be cut when the furnace is installed with either the Harmony IIIt zone control or a thermostat which features humidity control. If the link is left intact the PWM signal from the Har mony III control will be blocked and also lead to control dam age. Refer to table 15 for operation sequence in applica tions including SLP98DFV, a thermostat which features hu midity control and a single-speed outdoor unit. Table 16 gives the operation sequence in applications with a twospeed outdoor unit.

On-Board Link W951 R to O (Figure 4)

On-board link W951 is a clippable connection between ter minals 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 ener gized 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 ter minals 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 sta tus, 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 sevensegment 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 re sumes 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: D Initiate furnace ignition and move to and hold low-fire

rate by applying a R to W1 jumper.

D Initiate furnace ignition sequence and move to and hold

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

D Initiate furnace ignition sequence and move to and hold

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

D 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.

D 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 per form the high-fire and low-fire pressure switch calibra tions 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 begin ning. A The integrated control will automatically exit the Field Test mode after 45 minutes of operation.

Soft Disable

Soft disabling is when thermostat finds a device on the BUS that it does not recognize and the thermostat sends a the device a message to be in soft disabling mode until properly configured. Two horizontal bars will display.

Steps to follow if the damper control module is displaying the soft disable code.

o, cycle the main power to exit the Field Test mode.

1- Confirm proper wiring between all devices (thermo stat, damper control module, indoor and outdoor).

2- Cycle power to the control that is displaying the soft disable code.

3- Put the room thermostat through set up.

4- Go to setup / system devices / thermostat / edit / then push reset.

5- Go to setup / system devices / thermostat / edit / then push resetAll.

Page 15

Page 16

TABLE 11

Idle Menu Options

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

DISPLAY

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

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

DISPLAY

No change (blinking “-”) remain in field test mode

Solid “-” exit field test mode

Solid “c” start pressure switch calibration

Field Test Menu Options

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

ACTION (when button released)

TABLE 12

ACTION (when button released)

TABLE 13

DISPLAY

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.

ACTION (when button released)

Page 16

Page 17

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:

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.

Yes

−

Furnace control in IDLE mode

No heating, cooling or indoor fan

operation)

Turn room thermostat to OFF

UNIT SIZE

CODE

FURNACE MODEL

SLP98DFV070-36B

SLP98DFV-090-36C

SLP98DFV-090-48C

SLP98DFV-090-60C

SLP98DFV-110-60C

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.

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).

−

. If

−

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 three horizontal bars display, board does not recognize unit size code function must be repeated)

. Programming

FINISHED

Page 17

Page 18

TABLE 14

LED 7 Segment Status / Error Code

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 (display ing 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 setting 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 set ting displayed / Pause / Repeat codes.

Defrost mode.

Discharge air temperature

Soft disable - Soft disabling is when thermostat finds a device on the BUS that it does not recognize and the thermostat sends a the device a message to be in soft disabling mode until properly configured. Two horizontal bars will display.

E 105

Device communication problem - No other devices on BUS (Communication system).

E 110

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

E 113

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

E 114

Line voltage frequency out-of-range. No 60 hertz power (Check voltage and frequency).

E 115

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

E 120

Unresponsive device. Usually caused by delay in outdoor unit responding to

E 124

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

E 125

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.).

E 126

Failed internal control communication between microcontrollers. Hardware problem on the control board. Cycle power on

E 131

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

E 180

Outdoor air sensor failure - NO error if disconnected. Only shown if shorted or out-of-range.

E 200

Hard lockout - Rollout circuit open or previously open. Correct unit cause of rollout trip or replace flame rollout

E 201

Indoor blower communication failure - Unable to communicate with blower motor. Indoor blower communication failure including power

Steps to follow if the damper control module is displaying the soft disable code.

1- Confirm proper wiring between all devices (thermostat, damper control module, indoor and outdoor). 2- Cycle power to the control that is displaying the soft disable code. 3- Put the room thermostat through set up. 4- Go to setup / system devices / thermostat / edit / then push reset. 5- Go to setup / system devices / thermostat / edit / then push resetAll.

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.

outage.

Page 18

Page 19

Integrated Control Diagnostic Codes (continued)

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

E 202

E 203

E 204

E 205

E 207

E 223

E 224

E 225

E 226

E 227

E 228

E 240

E 241

E 250

E 252

E 270

E 271

E 272

E 273

E 274

E 275

E 276

E 290

E 291

Indoor blower motor mis-match - Indoor motor horsepower does not match unit capacity.

Appliance capacity / size is NOT programmed. Invalid unit codes refer to configuration 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.

Low pressure switch failed open - Refer to troubleshooting in installation instruction.

Low pressure switch failed closed - Refer to troubleshooting in installation instruction.

High pressure switch failed open - Refer to troubleshooting in installation instruction.

High pressure switch failed closed - Refer to troubleshooting in installation instruction.

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.

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

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

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.

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.

Measure resistance of Hot Surface Ignitor, replace if open or not within specification.

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 restric tion.

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 re striction.

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.

Check micro amperes of flame sensor, clean or replace sensor. Measure voltage of neutral to ground for good unit ground.

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.

Page 19

Page 20

Integrated Control Diagnostic Codes (continued)

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

E 292

E 294

E 295

E 310

E 311

E 312

E 313

E 331

E 347

E 348

E 349

E 401

E 402

E 403

E 404

E 405

E 406

E 407

E 408

E 409

Indoor blower motor unable to start - Seized bearings, stuck wheel, etc. Indoor blower motor unable to start (seized

Combustion air inducer motor amp draw is too high. Check combustion blower bearings, wiring , amperes,

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

replace if it does not operate or meet performance.

Indoor blower motor temperature is too high. Indoor blower motor over temperature (motor

tripped on internal protector), Check motor bear ings, amperes. Replace if necessary.

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.

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 air flow in cooling or continuous fan mode is lower than cfm setting.

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 re place filter if needed or repair/ add ductwork.

Indoor or outdoor unit capacity mismatch. Incorrect Indoor /outdoor capacity code selected.

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

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

close or the relay coil did not energize).

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

close or the relay coil did not energize).

No 24 Volts between R & O with non-communicating outdoor unit (Dual fuel module required for heat pump application).

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

LSOM - Compressor ran more than 18 hours in air conditioning mode. Compressor protector is open. Check for high head

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

LSOM - Outdoor unit system pressure trip. Compressor ran over 18 hours in air conditioning

mode.

LSOM - Compressor short-cycling (Running less than 4 minutes). Outdoor unit pressure trip. Check dirty coil, fan mo

tor, refrigerant charge.

LSOM - Compressor rotor locked. Compressor short cycling (Running less than 4 min

utes).

LSOM - Compressor open circuit. Check capacitor, wiring, hard start kit , replace com

pressor.

LSOM - Compressor open start circuit. Check compressor for hot (cool down) , check pres

LSOM - Compressor open run circuit.

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

LSOM - Compressor contactor is welded.

LSOM - Compressor low voltage. Replace contactor.

Page 20

Page 21

TABLE 15

OPERATING SEQUENCE

SLP98DFV 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 ony

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 out door unit energized after cooling temperature set point has been reached in order to maintain room humidity setpoint.

Page 21

Page 22

TABLE 16

OPERATING SEQUENCE

SLP98DFV 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-ener gizes D on a call for dehumidification

Dehumidification mode begins when humidity is greater than set point

Thermostat will keep out door unit energized after cooling temperature set point has been reached in order to maintain room humidity setpoint.*

Thermostat energizes 2nd stage and de-ener gizes D on a call for dehumidification

Dehumidification mode begins when humidity is greater than set point

Dehumidification

call ONLY

1 On

Demand

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

VAC

High 70%

integrated control; With Heat Pump - Cut W914 (R to DS) & W951 (R to O) on SureLight integrated control. *ComfortSense

7000 thermostat only

Page 22

inte

Thermostat will keep out door unit energized after cooling temperature set point has been reached in order to maintain room humidity setpoint.

Page 23

B-Blower Compartment (Figure 7)

To Remove Blower From Unit:

1. Disconnect Power, 2. Remove access panels. 3. Remove Control Box 4. Remove Bolts. 5. Unplug Motor Wires From

Control Board (070 unit remove exhaust and air intake pipe)

Then Slide Out Front of Unit.

FIGURE 7

1. Blower Motor (B3)

A solid‐state controller is permanently attached to the motor. The controller is primarily an A.C. to D.C. convert er. 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 work load).

SLP98DFV BLOWER MOTOR COMPONENTS

STATOR

(WINDINGS)

BEARING

OUTPUT

SHAFT

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 se quence, the rotor shaft turns the blower.

WARNING

During blower operation, the ECM motor emits ener gy that may interfere with pacemaker operation. Inter ference is reduced by both the sheet metal cabinet and distance.

The SLP98DFV line uses three different motor sizes, a 1/2 hp, 3/4 hp and 1 hp. 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. SLP98DFV units use a three‐phase, electroni cally controlled D.C. brushless motor (controller converts single phase a.c. to three phase D.C.), with a permanent‐ magnet‐type rotor (figure 8). Because this motor has a perma nent magnet rotor it does not need brushes like conventional D.C. motors. Internal components are shown in figure 8. The stator wind ings are split into three poles which are electrically connected to the controller. This arrangement al l o w s m o t o r wi n d i ngs t o 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 SLP98DFV furnace line.

All SLP98DFV 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 at tached to the motor shell. The messages sent back and forth between the two controls serve to communicate rota tional 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 moni tors 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 discon nect switch is bounced when the disconnect is closed, the dis connect contacts may become welded. Try not to bounce the disconnect switch when applying power to the unit.

Page 23

Page 24

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 elec tronic 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 bear ing 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 attempt ing to service motor.

DANGER

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

Power Choke (L13)

A choke coil is used on SLP98DFV 5 ton 3/4 hp and 1 hp un its. Th e choke is located on the blower housing and is used to supress transient current spikes.

J49 4 Pin

J49 4 Pin Control Connector

J48 5 Pin Line Voltage Connector

FIGURE 9

Page 24

Page 25

Troubleshooting Motor Operation (figure 10)

To verify motor operation see steps below:

1- Remove J48 (5 pin power plug) from P48 on the mo tor.

2- With the power on at the furnace and door switch de pressed, 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

J48 Connector installed on motor

P49 4 Pin

120v

J48 Connector

240v

Page 25

24v Transformer

J49 Connector

FIGURE 10

Page 26

Troubleshooting Motor Windings

Ensure that motor windings are not damaged by performing the following tests:

NOTE - If your ohm meter is not an auto-ranging type, set it to the highest ohm scale (100k ohms or greater) before per forming tests.

TABLE 17

Ohm Meter Range

Scale

200k

20k

200 two hundred ohm 0-200

Measurement Range

in words ohms

two megohm -- two million ohms

two hundred kilohm -two hundred thou sand ohms

twenty kilohm -twenty thousand ohms

two kilohm -- two thousand ohms

0-2,000,000

0-200,000

0-20,000

0-2,000

FIGURE 11

TEST A

Measure the resistance between each of the three motor leads (3-pin plug) and the unpainted part of the end shield.

If the winding resistance to ground is <100k ohms, replace the motor and control module. If the resistance to ground is >100k, the motor windings are fine. Proceed to Test B.

Test A

FIGURE 12

TEST B

Use an ohmmeter to measure the motor phase-to-phase re sistance by checking these combinations of the the 3-pin motor plug. For the purpose of this test, start at either end of the connector as lead 1.

1 - The lead-to-lead resistance across any two leads

should be less than 20 ohms.

2 - Each lead-to-lead resistance should be the same. If the measured resistance is greater than 20 ohms, replace

the motor and control module.

Test B

Page 26

FIGURE 13

Page 27

C-Heating Components

1. Ignitor (Figure 14)

The SureLight nitor longevity is enhanced by controlling voltage to the igni tor. The integrated control provides a regulated 120 volts to the ignitor for a consistent ignition and long ignitor life. 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 14)

A flame sensor is located on the left side of the burner sup port. 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 re moving 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 re main 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 18 shows the flame signal for the SLP98DFV unit.

Normal

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.

3. Flame Rollout Switches (Figure 14)

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

ignitor is made of durable silicon nitride. Ig

TABLE 18

Flame Signal in Microamps

Low Drop Out

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 com bustion 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 14)

All units use inshot burners. Burners are factory set and re quire no adjustment. Always operate the unit with the burner box front panel in place. Each burner uses an orifice that is precisely matched to the burner input. Burners can be re moved as a one piece assembly for service. If burner assem bly has been removed, it is critical to align center of each burn er to the center of the clamshell when re-installing. See more detail in Section VII- MAINTENANCE..

5. Duralock Plus Heat Exchanger (Figure 15)

SLP98DFV 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 burner venturi and at the corbel orifices. The gas / air mixture is then burned at the en t rance of eac h clamsh e l l . Combustion gases are then pulled through the primary and secondary heat exchangers and exhausted out the exhaust vent pipe.

Page 27

Page 28

Ignitor

Rollout Switch

Burner Box Assembly

Burner Assembly

Intake Air Collar

Flame Sensor

Burner Box Front Cover

(remove screw to open cover)

Gas Valve

Sight Glass

FIGURE 14

Page 28

Page 29

6. Primary Limit Control (S10)

Figure 15 shows the primary limit (S10) used on SLP98DFV 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 automati cally 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 sus tainable air flow is reached. If the furnace reaches 35% fir ing rate, and adequate air flow is not available, the furnace will shutdown and enter one hour watchguard. For limit re placement remove wires from limit terminals and rotate limit switch 90 degrees. Slowly remove from the vestibule panel.

Primary Limit Location and Heat Exchanger

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.

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.

install limit face down

FIGURE 15

7. Gas Valve (GV1)

The SLP98DFV uses a variable capacity gas valve (figure

46) and is applicable for two-stage, three-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.

NEGATIVE AIR

PRESSURE PORT

INLET

SUPPLY

PRESSURE

TAP

GAS VALVE SHOWN IN THE ON POSITION

GAS VALVE

POSITIVE AIR

PRESSURE PORT

OUTLET

MANIFOLD

PRESSURE TAP

FIGURE 16

Page 29

Page 30

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

All SLP98DFV units are equipped with a combustion air in ducer (B6) and dual pressure switch assembly (high fire and low fire). The pressure switch (figure 17) serves four func tions. First it establishes calibration points for the vent cal ibration routine. The combustion air inducer's speed at a giv en 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 installa tion and interpolates the speeds required to achieve all inter mediate rates between these two points. The setting for lowfire 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 allow ing ignition. The low fire pressure switch provides this func tion. 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.

If the switch assembly is to be replaced, replace the entire assembly. Individual switch components can not be re placed.

WARNING

The pressure switch is a safety shut-down control in the furnace and must not be jumpered for any rea son 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 in ducer is activated. This will determine if the pressure switch and furnace are operating properly. However, this may not indi cate if the sealed combustion system is operating properly.

Vent Calibration

The vent calibration sequence establishes furnace operat ing parameters in a specific installation. The integrated con trol 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 cal ibration 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:

S Initial call for heat

S Cycling main power off / on and then call for heat

S Venting conditions change (affecting high and low

pressure switch operation)

S Ramp down low fire switch check failed (calibration will follow next call for heat)

S 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). Wait 7.5 seconds.

3- Check low pressure switch, if open, increase RPM by 250, wait 5 seconds. Repeat this step until low pressure switch is closed.

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

low fire

Pressure Switch (S18)

FIGURE 17

bracket

high fire

5- Keep this RPM as RPM1.

6- Increase RPM by 1250. Wait 5 seconds.

7- Check high pressure switch, if open, increase RPM by 250, wait 5 seconds. Repeat this step until high pres sure switch is closed.

8- Decrease RPM by 50, check after 5 seconds. Repeat this step until switch is open.

9- Keep this RPM as RPM2.

10- Calibration complete.

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.

Page 30

Page 31

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 fur ther action.

Measuring Pressure Differential

Field Installed

6- If low pressure switch is still closed, decrease induc er speed 1/2 of the low pressure switch open RPM mar gin. Allow 5 seconds to stabilize.

7- If low pressure switch is open turn off inducer. No fur ther action.

8- If low pressure switch is still closed, set flag for cal ibration on next call for heat and turn off inducer.

Measuring pressure differential (Figure 18)

Checks of pressure differential can aid in troubleshooting. Len nox 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 in take or exhaust piping, but may i n d i cate p roblems in t h e heat exchanger, condensing coil, header boxes, com bustion inducer or other components.

The differential pressure is the difference in pressure mea sured across the cold end header box orifice.

BLACK TUBING

POSITIVE

To Cold End Header Box

RED and BLACK TUBING

or RED TUBING NEGATIVE

Red

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

2 - Install a tee in the negative (-) line (red and black tubing or 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 measuring device with hose from the negative (-)

side of the measuring device to the tee installed in the neg ative (-) line and with hose from the positive (+) side of the measuring device 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.

Measuring Device

4 - Operate unit and observe measuring device 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 20.

5 - Remove thermostat demand and allow to cycle off.

6 - Remove measuring device and tee's. Reinstall combustion

air sensing hoses to the pressure switch.

FIGURE 18

Page 31

Page 32

The CAI is installed on the cold end header box (see figure

16). 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 19 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 19

SLP98DFV Unit

-070-1 / -5

-070-6 / -9

-070-10 and later

-090-1 / -9

-090-10 and later

-110-1 / -9

-110-10 and later

C.A.I. Orifice Size

0.780

0.833

0.775

0.920

0.890

1.030

1.000

TABLE 20

Pressure Switch 0' to 7500'

SLP98DFV Unit

Set Point

High Fire

Set Point

Low Fire

-070

-090

1.00 + 0.05 0.25 + 0.05

-110

*Units over 7500 ft will require a conversion kit. See table 32.

Page 32

Page 33

Combustion Air Inducer / Cold End Header Box / Vent Pipe Assembly

Intake Air Pipe

Exhaust Pipe

Cold End Header Box

Drain Cap

Combustion Air Inducer (CAI)

Exhaust Connector

with Alignment Tabs

Pipe Clamp

Blower Deck Seal

Exhaust Coupling

Exhaust Elbow

Tubing

Clamp

CAI Embossment

FIGURE 19

Page 33

Intake Air Coupling

Page 34

II-icomfort Wi-Fi

thermostat (if applicable)

In communicating applications the Lennox icomfort Wi-Fi thermostat must be used. In these applications the icomfort Toucht thermostat overrides the DIP switch settings on the

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

thermostat wiring

See figures 20 and 21 for icomfort Wi-Fi in communicating applications.

icomfort Wi-Fi

Thermostat with SLP98DFV

and Non-Communicating Outdoor Unit

icomfort Wi-Fi® Thermostat icomfortt-Enabled SLP98DFV Indoor Furnace Non-Communicating Outdoor Air Conditioner

icomforttENABLED

SLP98DFV

OPTIONAL DISCHARGE AIR SENSOR

icomfort Wi-Fi THERMOSTAT

FURNACE

OPTIONAL OUTDOOR

AIR SENSOR

NON-COMMUNICATING

OUTDOOR AIR

CONDITIONING UNIT -

1 OR 2 STAGE

icomfort Wi-Fi® Thermostat with SLP98DFV

and icomfort-ENABLED Outdoor Unit

icomfort Wi-Fi® Thermostat icomfortt-Enabled SLP98DFV Indoor Furnace icomfortt-Enabled Outdoor Air Conditioner or Heat Pump

icomfortt-

ENABLED SLP98DFV FURNACE

OPTIONAL

DISCHARGE

AIR SENSOR

OPTIONAL OUTDOOR

AIR SENSOR

icomfort Wi-Fi THERMOSTAT

icomfortt- ENABLED

OUTDOOR AIR CONDITIONIN

OR HEAT PUMP UNIT

CLIP Y1 TO Y2 FOR

TWO-STAGE OPERATION

Outdoor Unit

Indoor Unit Controller

Single wire to terminal C

Unused wires

Single wire to terminal C

Unused wires

IcomfortWi-Fi thermostat

Communicating systems using the IcomfortWi-Fi® thermostat require four ther mostat wires between the thermostat and the furnace/air handler control and four wires between the outdoor unit and the furnace/air handler control. When a ther mostat cable with more than four wires is used, the extra wires must be properly connected to avoid electrical noise. The wires must not be left disconnected.

Use wire nuts to bundle the four unused wires at each end of the cable. A single wire should then be connected to the indoor unit end of the wire bundle and attached to the “C” terminals as shown in the diagram above.

FIGURE 20

Page 34

Page 35

Optional Accessories for use with any icomfort Touch System

DISCHARGE AIR SENSOR

icomfort Toucht

THERMOSTAT

NOTE: 24V UV LIGHT APPLICATIONS

Furnace transformer will not have ad equate va to power 24v UV light ap plications. An additional transformer for UV light applications is required.

icomforttENABLED

SLP98DFV

FURNACE

NOTE: icomfortt 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 HU MIDIFIER (IF NOT ALREADY IN THE SYSTEM FOR OTHER FUNCTIONS. BUILT INTO ALL icomfortt OUTDOOR UNITS).

icomforttENABLED

SLP98DFV

FURNACE

icomfortt-

ENABLED SLP98DFV 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 DE TAILS

icomfortt-

ENABLED SLP98DFV FURNACE

icomforttENABLED

SLP98DFV

FURNACE

(C)

icomfortt- ENABLED

OUTDOOR AIR

CONDITIONING OR

HEAT PUMP UNIT

NON-COMMUNICATING

1 OR 2 STAGE AC OR HP UNIT

(C)

(disables out

door unit only)

FIGURE 21

Page 35

Page 36

III-PLACEMENT AND INSTALLATION

Pipe & Fittings Specifications

All pipe, fittings, primer and solvent cement must conform with American National Standard Institute and the Ameri can Society for Testing and Materials (ANSI/ASTM) stan dards. The solvent shall be free-flowing and contain no lumps, undissolved particles or any foreign matter that ad versely affects the joint strength or chemical resistance of the cement. The cement shall show no gelation, stratifica tion, or separation that cannot be removed by stirring. Re fer to table 21 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

CANADIAN PIPE, FITTINGS &

SOLVENT CEMENT

PVC & CPVC Pipe and Fittings PVC & CPVC Solvent Cement

ABS to PVC or CPVC Transition Cement

POLYPROPYLENE VENTING SYSTEM ULC-S636 PolyPro® by Duravent ULC-S636 InnoFlue® by Centrotherm ULC-S636

TABLE 21

D2661

D2665

ASTM

SPECIFICATION

D2564, D2235, F493

D3138

MARKING

ULCS636

CAUTION

Solvent cements for plastic pipe are flammable liq uids and should be kept away from all sources of igni tion. Do not use excessive amounts of solvent ce ment 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

SLP98DFV exhaust and intake connections are made of PVC. Use PVC primer and solvent cement when us ing 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 21. As an alter nate, use all purpose cement, to bond ABS, PVC, or CPVC pipe when using fittings and pipe made of the same materi als. Use transition solvent cement when bonding ABS to ei ther PVC or CPVC.

Low temperature solvent cement is recommended. Metal or plastic strapping may be used for vent pipe hangers. Uni formly 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) sys tem. In addition, the first three feet of vent pipe from the furnace flue collar must be accessible for inspection.

Table 22 lists the available exhaust termination kits.

Page 36

Page 37

OUTDOOR TERMINATION KITS USAGE*

TABLE 22

STANDARD KITS CONCENTRIC KITS

Flush

Vent

Input Size

070

090

110

* Kits must be properly installed according to kit instructions. NOTE - Standard Terminations do not include any vent pipe or elbows external to the structure. Any vent pipe or elbows external to the structure must be included in total vent length calcula

tions. See vent length tables.

Requires field-provided outdoor 1-1/2” exhaust accelerator.

Concentric kits 71M80 and 44W92 include 1-1/2” outdoor accelerator, when used with 045 and 070 input models.

Flush mount kits 51W11 and 51W12 include 1-1/2 in. outdoor exhaust accelerator, required when used with 045, 070 and 090 input models.

Termination kits 30G28, 44W92, 4493 and 81J20 are certified to ULC S636 for use in Canada only.

See table 27 for vent accelerator requirements.

Pipe

Dia. in.

2-1/2

2 YES YES YES

2-1/2 YES YES

3 YES YES

Mount

Kit

51W11

(US)

51W12

(CA)

YES YES

YES YES YES

2 inch 3 inch 2 inch

22G44 (US)

30G28 (CA)

Joint Cementing Procedure

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

NOTE - A sheet metal screw may be used to secure the intake pipe to the connector, if desired. Use a drill or self tapping screw to make a pilot hole.

Wall Kit Wall Ring Kit

44J40

(US)

81J20 (CA)

YES

15F74

YES

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.

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

side socket surface of fitting. Cement should be ap plied lightly but uniformly to inside of socket. Take care to keep excess cement out of socket. Apply second

1-1/2 inch 2 inch 3 inch

Field

Fabricated

YES

YES YES YES

71M80

(US)

44W92

(CA)

YES

69M29

(US)

44W92

(CA)

60L46 (US)

44W93 (CA)

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.

NOTE - Time is critical at this stage. Do not allow prim er 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 dur ing assembly (but not after pipe is fully inserted) to dis

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.

NOTE - Check the inside of vent pipe thoroughly for any obstruction that may alter furnace operation.

4 - Test fit joint and mark depth of fitting on outside of pipe.

tribute cement evenly. DO NOT turn ABS or cellular core pipe.

NOTE - Assembly should be completed within 20 sec onds 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 37

Page 38

Venting Practices

Piping Suspension Guidelines

SCHEDULE 40 PVC --

Support every 5 feet.

all other pipe* --

Support every 3 feet.

* See table 21 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

1. 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.

2. 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 (Figure 25)

Route piping to outside of structure. Continue with installa tion following instructions given in piping termination sec tion.

CAUTION

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

inside outside

Wall

FIGURE 22

REPLACING FURNACE THAT WAS PART OF A

CHIMNEY

OR GAS

VENT

(Check sizing

for water

heater only)

FURNACE (Replaced by SLP98)

If an SLP98 furnace replaces a furnace which was com monly 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 23

CAUTION

The exhaust vent pipe operates under positive pres sure and must be completely sealed to prevent leak age of combustion products into the living space.

Vent Piping Guidelines

NOTE - Lennox has approved the use of DuraVent Centrotherm manufactured vent pipe and terminations as

an option to PVC. When using the PolyPro InnoFlue

by Centrotherm venting system the vent pipe re

by DuraVent or

quirements stated in the unit installation instruction – minim um & maximum vent lengths, termination clearances, etc. – apply and must be followed. Follow the instructions provided with PoyPro by DuraVent and InnoFlue trotherm venting system for assembly or if requirements are more restrictive. The PolyPro by Duravent and InnoFlue by Centrotherm venting system must also follow the uninsu lated and unconditioned space criteria listed in table 26.

The SLP98DFV is installed only as a Direct Vent gas cen tral 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 23 and 24. Count all elbows inside and outside the home. Table 23 lists the minimum vent pipe lengths per mitted. Table 24 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 27.

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

by Cen

and

Page 38

Page 39

MINIMUM VENT PIPE LENGTHS

TABLE 23

SLP98DF

MODEL

070, 090, 110

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

MIN. EQUIV.

VENT LENGTH

15 ft.*

EXAMPLE

5 ft. plus 2 elbows of 2”, 2-1/2” or

3” diameter pipe

NOTE - It is acceptable to use any pipe size which fits within the guidelines allowed in table 24.

NOTE - The exhaust collar on all models is sized to ac commodate 2” Schedule 40 vent pipe. Contact the Ap plication Department for more information concerning sizing of vent systems which include multiple pipe sizes.

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.

Use the following steps to correctly size vent pipe diameter.

Piping Size Process

What is the

furnace capacity?

070, 090, 110?

Which style termination

being used?

Standard or concentric?

See table 22.

Which needs

most elbows?

Intake or

exhaust?

How many elbows? Count all elbows inside

and outside house.

IMPORTANT

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

Desired pipe size?

2”, 2-1/2”, 3”

What is the altitude of the furnace installation?

Use table 24 to find max intake or exhaust pipe

length. Includes all vent pipe and elbows inside and outside the house.

FIGURE 24

Page 39

Page 40

Maximum Allowable Intake or Exhaust Vent Length in Feet

TABLE 24

NOTE - Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust must be same pipe size.

NOTE - Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length calculation.

Standard Termination at Elevation 0 - 4500'

Number Of

90° Elbows

Used

1 91 69 14 140 93 43 162 143 11 8

2 86 64 9 135 88 38 157 138 113 3 81 59 4 76 54 125 78 28 147 128 103 5 71 49 120 73 23 142 123 98 6 66 44 115 68 18 137 118 93 7 61 39 110 63 13 132 113 88 8 56 34 105 58 9 51 29 100 53 122 103 78

10 46 24 95 48 117 98 73

Number Of

90° Elbows

Used

1 66 69 14 115 93 43 137 143 11 8

2 61 64 9 110 88 38 132 138 11 3 3 56 59 4 51 54 100 78 28 122 128 103 5 46 49 95 73 23 117 123 98 6 41 44 90 68 18 112 118 93 7 36 39 85 63 13 107 113 88 8 31 34 80 58 9 26 29 75 53 97 103 78

10 21 24 70 48 92 98 73

Number Of

90° Elbows

Used

1 41 44 2 36 39 85 63 107 113 88 3 31 34 80 58 102 108 83 4 26 29 75 53 97 103 78 5 21 24 70 48 92 98 73 6 16 19 65 43 87 93 68 7 11 14 60 38 82 88 63

9 50 28 72 78 53

10 45 23 67 73 48

070 090 110 070 090 11 0 070 090 110

n/a

2” Pipe 2-1/2” Pipe 3” Pipe

Model Model Model

130 83 33 152 133 108

n/a

127 108 83

n/a

Standard Termination Elevation 4501' - 7500'

2” Pipe 2-1/2” Pipe 3” Pipe

Model Model Model

105 83 33 127 133 108

n/a

102 108 83

n/a

Standard Terminating at Elevation 7501' - 10,000''

2” Pipe 2-1/2” Pipe 3” Pipe

Model Model Model

n/a

90 68

n/a

55 33 77 83 58

112 118 93

NOTE - Table 23 continued on next page with concentric terminations.

Page 40

Page 41

TABLE 25

Maximum Allowable Intake or Exhaust Vent Length in Feet

*Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust must be same pipe size.

Concentric Termination at Elevation 0 - 4500'

Number Of

90° Elbows

Used

1 83 67 12 130 89 39 146 139 11 4

2 78 62 7 125 84 34 141 134 109 3 73 57 4 68 52 115 74 24 131 124 99 5 63 47 110 69 19 126 119 94 6 58 42 105 64 14 121 114 89 7 53 37 100 59 8 48 32 95 54 111 104 79 9 43 27 90 49 106 99 74

10 38 22 85 44 101 94 69

Number Of

90° Elbows

Used

1 58 67 12 105 89 39 121 114 114

2 53 62 7 100 84 34 116 109 109 3 48 57 4 43 52 90 74 24 106 99 99 5 38 47 85 69 19 101 94 94 6 33 42 80 64 14 96 89 89 7 28 37 75 59 8 23 32 70 54 86 79 79 9 18 27 65 49 81 74 74

10 13 22 60 44 76 69 69

Number Of

90° Elbows

Used

1 33 42 2 28 37 75 59 91 109 84 3 23 32 70 54 86 104 79 4 18 27 65 49 81 99 74 5 13 22 60 44 76 94 69 6 7 12 50 34 66 84 59

9 40 24 56 74 49

10 35 19 51 69 44

070 090 110 070 090 110 070 090 110

070 090 110 070 090 11 0 070 090 110

n/a

2” Pipe 2-1/2” Pipe 3” Pipe

Model Model Model

120 79 29 136 129 104

n/a

Concentric Termination Elevation 4501' - 7500'

2” Pipe 2-1/2” Pipe 3” Pipe

Model Model Model

95 79 29 111 104 104

n/a

Concentric Terminating at Elevation 7501' - 10,000''

2” Pipe 2-1/2” Pipe 3” Pipe

Model Model Model

80 64

17 55 39 71 89 64

n/a

45 29 61 79 54

n/a

116 109 84

91 84 84

96 114 89

Page 41

Page 42

TYPICAL EXHAUST PIPE CONNECTIONS AND CONDENSATE TRAP INSTALLATION

TRAP

2”

DO NOT transition from smaller to larger pipe size in horizontal

3”

TRANSITION

*2“

Use only the factory−supplied

trap. Trap can be installed on

either side of cabinet within 5 ft.

of the furnace.

* When transitioning up in pipe size, use the shortest length of 2” PVC pipe possible.

NOTE − Exhaust pipe and intake pipe must be the same diameter.

runs of exhaust pipe.

Air Intake

FIGURE 25

TYPICAL AIR INTAKE PIPE CONNECTIONS

2”

Exhaust

TOP VIEW

TRAP

TRANSITION

*2”

Use only the factory−supplied

trap. Trap can be installed on

either side of cabinet within 5 ft.

of the furnace.

* When transitioning up in pipe size, use the shortest length of 2” PVC pipe possible.

NOTE − Intake pipe and exhaust pipe must be the same diameter.

3”

TRANSITION

*2”

Air Intake

FIGURE 26

Exhaust

TOP VIEW

Page 42

Page 43

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 (228mm) for ap

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

Btuh (15 kw), 12 inches (305mm) for ap

pliances > 50,000 Btuh (15kw)

C =

Clearance to permanently

* 12”

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 (610mm)

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) 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 (228mm) for ap

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

Btuh (15 kw), 12 inches (305mm) for ap

pliances > 50,000 Btuh (15kw)

K =

Clearance to mechanical air sup

ply inlet

L =

Clearance above paved sidewalk or

paved driveway located on public property

M =

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

† 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.

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

(3m) horizontally

* 7 feet (2.1m)

*12 inches (305mm)‡

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) 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.”

FIGURE 27

Page 43

Page 44

General Guidelines for Vent Terminations

In Direct Vent applications, combustion air is taken from outdoors and the flue gases are discharged to the out doors. The SLP98DFV is classified as a direct vent, Cate gory IV gas furnace.

In Direct Vent applications, the vent termination is limited by local building codes. In the absence of local codes, refer to the current National Fuel Gas Code ANSI Z223-1/NFPA 54 in U.S.A., and current CSA-B149 Natural Gas and Pro pane Installation Codes in Canada for details.

Position termination according to location given in figure 27. In addition, position termination so it is free from any ob structions and 12” above the average snow accumulation.

At vent termination, care must be taken to maintain protective coatings over building materials (prolonged exposure to exhaust condensate can destroy protective coatings). It is recommended that the exhaust outlet not be located within 6 feet (1.8m) of a condensing unit because the condensate can damage the painted coating.

NOTE - See table 26 for maximum allowed exhaust pipe length without insulation in unconditioned space during winter design temperatures below 32°F (0°C). If required

exhaust pipe should be insulated with 1/2” (13mm) Arma flex or equivalent. In extreme cold climate areas, 3/4” (19mm) Armaflex or equivalent may be necessary. Insula tion must be protected from deterioration. Armaflex with UV protection is permissable. Basements or other en closed areas that are not exposed to the outdoor ambient temperature and are above 32 degrees F (0°C) are to be considered conditioned spaces.

IMPORTANT

Do not use screens or perforated metal in exhaust ter minations. Doing so will cause freeze-ups and may block the terminations.

IMPORTANT

For Canadian Installations Only: In accordance to CSA International B149 installation codes, the minimum allowed distance between the combustion air intake inlet and the exhaust outlet of other appliances shall not be less than 12 inches (305mm).

Maximum Allowable Vent Pipe Length (in ft.) Without Insulation In Unconditioned Space For

TABLE 26

Winter Design Temperatures Modulating High Efficiency Furnace

Winter Design

Temperatures

32 to 21

(0 to -6)

°F (°C)

Vent Pipe

Diameter

PVC

070 090 110

PP PVC

2 in. 11 9 14 12 18 15

2-1/2 in. 7 N/A 10 N/A 12 N/A

Unit Input Size

PP PVC

3 in. N/A N/A 6 6 8 8

2 in N/A N/A 6 4 8 6

20 to 1

(-7 to -17)

2-1/2 in. N/A N/A N/A N/A N/A N/A

3 in. N/A N/A N/A N/A N/A N/A

2 in. N/A N/A N/A N/A N/A N/A

0 to -20

(-18 to -29)

2-1/2 in. N/A N/A N/A N/A N/A N/A

3 in. N/A N/A N/A N/A N/A N/A

1Refer to 99% Minimum Design Temperature table provided in the current edition of the ASHRAE Fundamentals Handbook.

Poly-Propylene vent pipe (PP) by Duravent and Centrotherm. NOTE - Concentric terminations are the equivalent of 5' and should be considered when measuring pipe length. NOTE - Maximum uninsulated vent lengths listed may include the termination(vent pipe exterior to the structure) and cannot exceed 5 linear feet or the

maximum allowable intake or exhaust vent length listed in table 24 which ever is less. NOTE - If insulation is required in an unconditioned space, it must be located on the pipe closest to the furnace. See figure28.

Page 44

Page 45

Conditioned

Space

Pipe Insulation

Exhaust

Pipe

Conditioned

Space

FIGURE 28

Details of Intake and Exhaust Piping Terminations for Direct Vent Installations

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

NOTE - Flue gas may be slightly acidic and may adversely affect some building materials. If any vent termination is used and the flue gasses may impinge on the building mate rial, a corrosion-resistant shield (minimum 24 inches square) should be used to protect the wall surface. If the op tional tee is used, the protective shield is recommended. The shield should be constructed using wood, plastic, sheet metal or other suitable material. All seams, joints, cracks, etc. in the affected area should be sealed using an appropri ate sealant. See figure 32.

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 29 through 36 show typical termina tions.

1. Intake and exhaust terminations are not required to be in the same pressure zone. You may exit the intake on one side of the structure and the exhaust on another side (figure 30). You may exit the exhaust out the roof and the intake out the side of the structure (figure 31).

2. Intake and exhaust pipes should be placed as close to gether as possible at termination end (refer to illustra tions). Maximum separation is 3” (76mm) on roof ter minations and 6” (152mm) on side wall terminations.

Intake

Unconditioned

Space

Pipe

NOTE - When venting in different pressure zones, the maximum separation requirement of intake and ex haust pipe DOES NOT apply.

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

29).

4. Exhaust piping must terminate straight out or up as shown. A reducer may be required on the exhaust pip ing at the point where it exits the structure to improve the velocity of exhaust away from the intake piping. See table 27.

NOTE - Care must be taken to avoid recirculation of ex haust back into intake pipe.

TABLE 27

EXHAUST PIPE TERMINATION SIZE REDUCTION

SLP98DFV

MODEL

*070 2”, 2-1/2” or 3” 1-1/2” *090 2”, 2-1/2” or 3” 2”

110 2”, 2-1/2” or 3” 2”

Exhaust Pipe Size Termination Pipe Size

*SLP98DF -070 and -090 units with the flush-mount termina tion must use the 1-1/2” accelerator supplied with the kit.

5. On field-supplied terminations for side wall exit, ex haust 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 figure 32.

Page 45

Page 46

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 figure 32.

Inches(mm)

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

3”(76mm) MAX.

(15F75 or 44J41)

SIZE TERMINATION

PIPE PER TABLE 27.

UNCONDITIONED

ATTIC SPACE

1/2” (13mm) FOAM

INSULATION IN

UNCONDITIONED

SPACE

FIGURE 29

Exiting Exhaust and Intake Vent

(different pressure zones)

Exiting Exhaust and Intake Vent

(different pressure zones)

Roof T

erminated

Exhaust Pipe

Inlet Air

Furnace

(Minimum 12 in. 305 MM) above

grade or snow

accumulation

FIGURE 31

7. If intake and exhaust piping must be run up a side wall

to position above snow accumulation or other ob

structions, piping must be supported. At least one

bracket must be used within 6” from the top of the el

bow and then every 24” (610mm) as shown in figure

32, to prevent any movement in any direction. When

exhaust and intake piping must be run up an outside

wall, the exhaust piping must be terminated with pipe

sized per table 27.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.

Exhaust

Pipe

Furnace

FIGURE 30

Inlet Air

(Minimum 12 in.

305 MM) above

grade or snow

accumulation

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 34.

Page 46

Page 47

NOTE − FIELD−PROVIDED

REQUIRED TO ADAPT

LARGER VENT PIPE SIZE

* WALL

SUPPORT

REDUCER MAY BE

TO TERMINATION

STRAIGHT

APPPLICATION

EXTENDED

APPLICATION

FIELD FABRICATED WALL TERMINATION

A− Minimum clearance

above grade or average

snow accumulation

B− Maximum horizontal separation between

intake and exhaust

C1 -Minimum from end of

exhaust to inlet of intake

C2 -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)

See venting table 24 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 within 6” (152 mm) from top of each pipe (intake and exhaust) to prevent movement in any direction.

Intake Elbow

2” (51mm)

Vent Pipe

12” (305 mm)

6” (152 mm)

3” (76mm)

Vent Pipe

12” (305 mm)

6” (152 mm)6” (152 mm)

8” (203 mm)8” (203 mm)

6” (152 mm)6” (152 mm)

20” (508 mm)

6” (152 mm)

ALTERNATE TERMINATIONS (TEE & FORTY−FIVE DEGREE ELBOWS ONLY)

2” (51MM)

12”

The exhaust termination tee should be connected to the 2” or 3” PVC flue pipe as shown in the illustration.

As required. Flue gas may be acidic and may adversely affect some building materials. If a side wall vent

Intake Elbow

Do not use an accelerator in applications that include an exhaust termination tee. The accelerator is not required.

termination is used and flue gases will impinge on the building materials, a corrosion−resistant shield (24 inches square) should be used to protect the wall surface. If optional tee is used, the protective shield is recommended. The shield should be constructed using wood, sheet metal or other suitable material. All seams, joints, cracks, etc. in affected area, should be sealed using an appropriate sealant. Exhaust pipe 45° elbow can be rotated to the side away from the combustion air inlet to direct exhaust away from adjacent property. The exhaust must never be directed toward the combustion air inlet.

Front View of

Intake and Exhaust

Intake

Exhaust

A− Clearance above

grade or average snow

accumulation

B− Horizontal

separation between

intake and exhaust

C− Minimum from

end of exhaust to

inlet of intake

D− Exhaust pipe length

E− Wall support distance

from top of each pipe

(intake/exhaust)

Vent Pipe

12” (305 mm) Min. 12” (305 mm) Min.

6” (152 mm) Min. 24” (610 mm) Max.

9” (227 mm) Min.

12” (305 mm) Min. 16” (405 mm) Max.

6” (152 mm) Max.

3” (76MM)

Vent Pipe

6” (152 mm) Min. 24” (610 mm) Max.

9” (227 mm) Min.

12” (305 mm) Min. 20” (508 mm) Max.

6” (152 mm) Max.

FIGURE 32

Page 47

Page 48

FIELD-PROVIDED

REDUCER MAY BE RE

QUIRED TO ADAPT

LARGER VENT PIPE

SIZE TO TERMINATION.

EXHAUST

AIR

INTAKE

AIR

(Not Furnished)

OUTSIDE

WALL

CLAMP

1-1/2” (38mm) accelerator

provided on 71M80 &

44W92 kits for

SL98DF070V36B

INTAKE

AIR

INTAKE

AIR

DIRECT VENT CONCENTRIC WALL TERMINATION

71M80, 69M29 or 60L46 (US)

44W92 or 44W93 (Canada)

FIGURE 33

EXHAUST

AIR

12” (305mm) Min.

above grade or

average snow

accumulation.

GRADE

12” (305mm)

Minimum

Above Average

Snow

Accumulation

CLAMP

1-1/2” (38mm) accelerator

provided on 71M80 &

44W92 kits for

SLP98DFV-36B-070

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

EXHAUST

VENT

5”

(127mm)

5-1/2”

(140mm)

12”

(305mm)

INTAKE

AIR

18” MAX.

(457mm)

Front View

EXHAUST VENT

12” (305mm) Min.

above grade or

Inches (mm)

INTAKE

average snow ac

cumulation.

AIR

optional intake elbow

Side View

OPTIONAL VENT TERMINATION FOR MULTIPLE UNIT

INSTALLATION OF DIRECT VENT WALL TERMINATION KIT

(30G28 or 81J20)

FIGURE 34

DIRECT VENT CONCENTRIC ROOFTOP TERMINATION

71M80, 69M29 or 60L46 (US)

41W92 or 41W93 (Canada)

FIGURE 35

2” EXTENSION FOR 2” PVC PIPE 1” EXTENSION FOR 3” PVC PIPE

FURNACE

INTAKE

PIPE

FLUSH-MOUNT SIDE WALL TERMINATION KIT

4''

51W11 (US) or 51W12 (Canada)

FURNACE EXHAUST

PIPE

GLUE EXHAUST

END FLUSH INTO

TERMINATION

1-1/2” ACCELERATOR (all -070 and -090 units)

FIGURE 36

Page 48

Page 49

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 27.

NOTE - Do not discharge exhaust gases directly into any chimney or vent stack. If ver tical 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 illus trated. In any exterior portion of chimney, the exhaust vent must be insulated.

INTAKE PIPE

INSULATION (optional)

SHEET

METAL TOP

PLATE

INSULATE TO FORM

SEAL

(76mm203mm)

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” (76mm203mm)

ALTERNATE INTAKE PIPE

EXTERIOR

PORTION OF

CHIMNEY

FIGURE 37

Condensate Piping

This unit is designed for either right‐ or left‐side exit of con densate piping. Refer to figures 38 and 40 for condensate trap locations.

CONDENSATE TRAP AND PLUG LOCATION

(shown with left side exit of condensation)

2 - For furnaces with a 1/2” drain connection use a 3/8 allen

wrench and remove plug (figure 38) 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. For furnaces with a 3/4” drain connec tion use a large flat head screw driver or a 1/2” drive socket extension and remove plug. Install provided 3/4 NPT street elbow fitting into cold end header box. Use Teflon tape or appropriate pipe dope.

3 - Install the cap over the clean out opening at the base of

the trap. Secure with clamp. See figure 44 (3/4” drain connection) or 45 (1/2” drain connection).

4 - Install drain trap using appropriate PVC fittings, glue all

joints. Glue the provided drain trap as shown in figure 44 or 45. Route the condensate line to an open drain.

5 - Figure 41 shows the furnace and evaporator coil using

a separate drain. If necessary, the condensate line from the furnace and evaporator coil can drain togeth er. See figures 42 and 43. The field provided vent must be a minimum 1” to a maximum 2” length above the condensate drain outlet connection.

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.

NOTE - Appropriately sized tubing and barbed fitting may be used for condensate drain. Attach to the drain on the trap using a hose clamp. See figure 39.

1-1/2 in.

Trap

(same other right side)

Plug

(same on left side)

FIGURE 38

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.

Field Provided Drain Components

Elbow

Barbed Fitting

Tubing

Hose Clamp

FIGURE 39

6 - If unit will be started immediately upon completion of

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

Condensate line must slope downward away from the 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. Heat cable kit is avail able from Lennox in various lengths; 6 ft. (1.8m) - kit no. 26K68 and 24 ft. (7.3m) - kit no. 26K69.

Page 49

Page 50

CONDENSATE TRAP LOCATION

(shown with right side exit of condensation)

Trap can be installed a maximum of 5ft. from furnace (*PVC only)

Field Provided Vent

1” min. 2” max. above

condensate drain.

1” min.

2” max.

5’ max.

to drain

*Piping from furnace must slope down a

minimum 1/4” per ft. toward trap

FIGURE 40

SLP98DFV with Evaporator Coil Using a Common Drain

Field Provided Vent

1” min. 2” max. above

condensate drain.

Condensate Drain

Connection

Evaporator Drain Line

(vent required)

FIGURE 42

SLP98DFV with Evaporator Coil

Using a Separate Drain

Field Provided Vent

1” min. 2” max. above

condensate drain.

Condensate Drain

Connection

Evaporator Drain Line

(vent required)

FIGURE 41

IMPORTANT

When combining the furnace and evaporator coil drains together, the A/C condensate drain outlet must be vented to relieve pressure in order for the furnace pressure switch to operate properly.

Drain

Condensate Trap With Optional Overflow Switch

From Evaporator Coil

Optional

Field Provided Vent

1” min. 2” max. above

condensate drain.

FurnaceCondensate

Drain

Connection

FIGURE 43

CAUTION

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

Page 50

Page 51

TRAP / DRAIN ASSEMBLY USING 1/2” PVC OR 3/4” PVC

COLD END HEADER BOX WITH 3/4” DRAIN CONNECTION

Optional Condensate Drain Connection

Adapter 3/4 inch slip X

3/4 inch mpt (not furnished)

90° Street Elbow 3/4 inch PVC (not furnished)

Condensate Drain

Connection In Unit

90° Street Elbow 3/4 inch PVC ( furnished)

Trap

Optional Drain Piping FromTrap

Drain Assembly for 1/2 inch Drain Pipe

1/2 inch PVC Pipe

(Not Furnished)

90° Elbow

1/2 inch PVC

(Not Furnished)

Drain

Drain Assembly for 3/4 inch Drain Pipe

1 (25 mm) Min. 2 (50 mm) Max. Above Top Of Condensate Drain Connection In Unit

Elbow 3/4 inch PVC

90°

(Not Furnished)

1/2 inch PVC Pipe

(Not Furnished)

Adapter 3/4 inch slip X

3/4 inch mpt (not furnished)

ent

5 Feet

Maximum

3/4 inch PVC Pipe

(Not Furnished)

Coupling 3/4 inch slip X slip

(Not Furnished)

Drain Trap

Assembly

(Furnished)

Condensate Drain

Connection In Unit

90° Elbow

3/4 inch PVC

(Not Furnished)

Drain

DrainTrap Assembly

(Furnished)

(178)

Drain Trap Clean Out

90° Elbow

3/4 inch PVC

(Not Furnished)

Coupling 3/4 inch slip X slip

Drain

DrainTrap Assembly with 1/2 inch Piping

1 (25 mm) Min. 2 (50 mm) Max. Above Top Of Condensate Drain Connection In Unit

(Not Furnished)

Vent

1/2 inch

Condensate Drain

Connection In Unit

Drain

DrainTrap Assembly with 3/4 inch Piping

1 (25 mm) Min. 2 (50 mm) Max. Above Top Of Condensate Drain Connection In Unit

Vent

3/4 inch

Condensate Drain Connection In Unit

Drain

FIGURE 44

Page 51

Page 52

TRAP / DRAIN ASSEMBLY USING 1/2” PVC OR 3/4” PVC

COLD END HEADER BOX WITH 1/2” DRAIN CONNECTION

Optional Condensate Drain Connection

Adapter 1/2 inch slip X

1/2 inch mpt (Not Furnished)

90° Street Elbow

1/2 inch PVC

(Not Furnished)

Condensate Drain

Connection In Unit

90° Street Elbow

1/2 inch PVC

(Furnished)

Trap

Optional Drain Piping From Trap

Drain Assembly for 1/2 inch Drain Pipe

1/2 inch PVC Pipe

(Not Furnished)

90° Elbow

1/2 inch PVC

(Not Furnished)

Drain

Drain Assembly for 3/4 inch Drain Pipe

1 (25 mm) Min. 2 (50 mm) Max. Above Top Of Condensate Drain Connection In Unit

90° Elbow 1/2 inch PVC

(Not Furnished)

1/2 inch PVC Pipe

(Not Furnished)

Adapter 1/2 inch slip X

1/2 inch mpt (Not Furnished)

Vent

5 Feet

Maximum

1/2 inch PVC Pipe

(Not Furnished)

Coupling 1/2 inch slip X slip

(Not Furnished)

Drain Trap

Assembly

(Furnished)

Condensate Drain

Connection In Unit

90° Elbow

3/4 inch PVC

(Not Furnished)

Drain

Drain Trap Assembly

(Furnished)

(178)

90° Elbow

3/4 inch PVC

(Not Furnished)

Coupling 3/4 inch slip X slip

Drain

Drain Trap Assembly with 1/2 inch Piping

1 (25 mm) Min. 2 (50 mm) Max. Above Top Of Condensate Drain Connection In Unit

(Not Furnished)

Vent

1/2 inch

Condensate Drain Connection In Unit

Drain

Drain Trap Clean Out

Drain Trap Assembly with 3/4 inch Piping

1 (25 mm) Min. 2 (50 mm) Max. Above Top Of Condensate Drain Connection In Unit

Vent

3/4 inch

Condensate Drain

Connection In Unit

Drain

FIGURE 45

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 underwa ter. A flood-damaged furnace is extremely danger ous. Attempts to use the furnace can result in fire or explosion. Immediately call a qualified service tech nician 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.

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 SLP98DFV 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:

SLP98DFV units are equipped with an automatic ignition system. Do not furnace. Each time the thermostat calls for heat, the burn ers will automatically light. The ignitor does not get hot when there is no call for heat on units with this ignition sys tem.

attempt to manually light burners on this

WARNING

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

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 mainte nance, turn the electrical power to unit OFF at discon nect 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 wa ter to ensure proper condensate drain operation.

Gas Valve Operation (Figure 46)

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 46.

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 instruc tions. 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 46

8 - Move gas valve switch to the ON position. See figure 46.

Do not force.

9 - Replace the upper access panel.

POSITIVE AIR

PRESSURE PORT

OUTLET

MANIFOLD

PRESSURE TAP

Page 53

Page 54

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 techni cian 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 guaran tee no gas leak into combustion chamber. Turn off power to unit. All access panels and covers must be in place and se cured.

V-HEATING SYSTEM SERVICE CHECKS

A-CSA Certification

All units are CSA design certified without modifications. Re fer to the SLP98DFV 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 over torque (800 in-lbs) or under torque (350 in-lbs) 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 dis connected and isolated. Gas valves can be damaged if sub jected to more than 0.5psig (14” W.C.). See figure 47.

MANUAL MAIN SHUT-OFF

VALVE WILL NOT HOLD

NORMAL TEST PRESSURE

1/8” N.P.T. PLUGGED TAP

CAP

FIGURE 47

When checking piping connections for gas leaks, use pre ferred means. Kitchen detergents can cause harmful corro sion 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- Proper Gas Flow (Approximate)

TABLE 28

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

Natural LP

1 cu ft

Dial

2 cu ft

Dial

FURNACE

ISOLATE

GAS VALVE

1 cu ft

Dial

2 cu ft

DIAL

Page 54

Page 55

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 28. If manifold pressure matches table 33 and rate is

incorrect, check gas orifices for proper size and restriction.

Remove temporary gas meter if installed.

E-Testing Gas Supply Pressure

When testing supply gas pressure, connect test gauge to

supply pressure tap on the gas valve. See figure 46. Check

gas line pressure with unit firing at maximum rate. Low pres

sure may result in erratic operation or underfire. High pres

sure can result in permanent damage to gas valve or over

fire. See table 29 for operating pressure at unit gas connec

tion (line).

On multiple unit installations, each unit should be checked

separately, with and without units operating. Supply pres

sure must fall within range listed in table 29.

TABLE 29

All SLP98DFV Units

Line Pressure WC” 4.5 - 10.5 11.0 - 13.0

Manifold Pressure Measurement (Figure 48)

To correctly measure manifold pressure, the differential

pressure between the positive gas manifold and the nega

tive burner box must be considered. Use pressure test

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

measurement.

1 - Remove the threaded plug from the outlet side of the

gas valve and install a field-provided barbed fitting. Connect measuring device “+” connection to barbed fitting to measure manifold pressure.

2 - Tee into the gas valve regulator vent hose and connect

measuring device “-” connection.

3 - Start unit on low heat (35% rate) and allow 5 minutes

for unit to reach steady state.

Natural LP

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 stabilize for 5 minutes, record

manifold pressure and compare to value given in table

33.

6 - Repeat steps 3, 4 and 5 on high heat.

7 - Shut unit off and remove manometer as soon as an ac

curate reading has been obtained. Take care to re move barbed fitting and replace threaded plug.

8 - Start unit and perform leak check. Seal leaks if found.

Operating Pressure Signal (Delta P) Measurement (Figure 49)

Operating pressure signal can be taken while the manifold pressure pressure check is taken (using two measuring de vices). Or, taken after the manifold pressure measurement is complete.

1 - Tee into the negative line between the gas valve and

pressure switch and connect to measuring device neg ative “-”.

2 - Tee into the positive line between the gas valve and

pressure switch and connect to measuring device posi tive “+”.

3 - Start unit on low heat (35% rate) and allow 5 minutes

for unit to reach steady state.

4 - After allowing unit to stabilize for 5 minutes, record op

erating pressure signal and compare to value given in table 33.

5 - Repeat steps 3 on 4 high heat.

CAUTION

Do not attempt to make adjustments to the gas valve.

Page 55

Page 56

Manifold Pressure Measurement

Gas Valve

Field Installed

FIGURE 48

Operating Signal (Delta P) Measurement

Red and Black Tubing or Red Tubing -

Field Installed

FIGURE 49

F- Proper Combustion

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

Negative Port

Positive Port

Black Tubing +

Gas Valve

Measuring Device

TABLE 30

High Fire

SLP98DFV Unit

CO2%

For Nat

CO2%

070

090

6.5 - 9.0 7.7 - 10.2

110

The maximum carbon monoxide reading should not exceed 100 ppm.

For L.P.

Page 56

Page 57

TABLE 31

Low Fire

SLP98DFV Unit

CO2%

For Nat

CO2%

For L.P.

070

090

4.7 - 7.2 5.7 - 8.2

110

The maximum carbon monoxide reading should not exceed 100 ppm.

Manifold and Operating Signal Pressures in inches 0 - 7500 ft (0 - 2286 m)

G- High Altitude

NOTE - In Canada, certification for installations at eleva tions over 4500 feet (1372 m) is the jurisdiction of local au thorities.

SLP98DFV units require no manifold pressure adjustments for operation at altitudes up to 10,000 feet (3048m) above sea level. However, units installed at altitude of 7,501 to 10,000 feet (2287 to 3048m) require a pressure switch change per table 32. Table 32 also lists conversion kit re quirements at all altitudes.

The combustion air pressure switch is factory-set and re quires no adjustment.

TABLE 33

Model

Input

Size

-070

-090

-110

TABLE 32

Conversion Kit Requirements

LP/Propane

Kit

0 - 10,000

(0 - 3048 m)

65W77 Not required 14T67

High Altitude Pressure Switch Kit

0 - 7,500

(0 - 2286 m)

7,501 - 10,000

(2287 - 3048m)

SLP98

Manifold Pressure Nat Gas Manifold Pressure LP/Propane

Operating Pressure Signal

(Delta P)

Firing Rate

Min Max Min Max Min Max

Low 0.4 0.95 1.2 2.8 0.20 0.40

High 3.0 3.8 9.1 10.5 0.95 1.25

NOTE - The values given in table are measurements only. The gas valve should NOT be adjusted.

NOTE - A natural to LP/propane gas changeover kit (table 32) is necessary to convert this unit. Refer to the changeover kit installation instruction for the conversion procedure.

Page 57

Page 58

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 SLP98DFV units depends on unit in put, 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 50.

2 - Punch a 1/4” diameter hole in

supply and return air ple

nums. Insert manometer

hose flush with inside edge of

hole or insulation. Seal

around the hose with perma

gum. Connect the zero end of

the manometer to the dis

charge (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.

STATIC PRESSURE TEST

filter

coil

FIGURE 50

VII-MAINTENANCE

WARNING

ELECTRICAL SHOCK, FIRE,

OR EXPLOSION HAZARD.

Failure to follow safety warnings exactly could result in dangerous operation, serious injury, death or prop erty damage. Improper servicing could result in dangerous opera tion, serious injury, death, or property damage. Before servicing, disconnect all electrical power to furnace. When servicing controls, label all wires prior to dis connecting. 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 SLP98DFV 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 SLP98DFV units use a 16 x 25 x1 filter.

IMPORTANT

If a highefficiency filter is being installed as part of this system to ensure better indoor air quality, the fil ter must be properly sized. Highefficiency filters have a higher static pressure drop than standardeffi ciency glass/foam filters. If the pressure drop is too great, system capacity and performance may be re duced. The pressure drop may also cause the limit to trip more frequently during the winter and the indoor coil to freeze in the summer, resulting in an increase in the number of service calls.

Before using any filter with this system, check the specifications provided by the filter manufacturer against the data given in the appropriate Lennox Product Specifications bulletin. Additional informa tion is provided in Service and Application Note ACC002 (August 2000).

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.

Page 58

Page 59

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

WARNING

Electric Shock Hazard. Can cause injury or death. Unit must be properly grounded in accordance with national and local codes.

WARNING

Fire Hazard. Use of aluminum wire with this product may result in a fire, causing property damage, severe injury or death. Use copper wire only with this product.

CAUTION

Failure to use properly sized wiring and circuit breaker may result in property damage. Size wiring and circuit breaker(s) per Product Specifications bulletin (EHB) and unit rating plate.

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.

Condensate Hose Screen (Figure 51)

Check the condensate hose screen for blockage and clean

if necessary.

1 - Turn off power to the unit. 2 - Remove hose from cold end header box. Twist and pull

screen to remove. 3 - Inspect screen and rinse with tap water if needed. 4 - Reinstall screen and turn on power to unit.

Condensate Hose Screen

Hose

FIGURE 51

Cleaning Heat Exchanger

If cleaning the heat exchanger becomes necessary, follow the below procedures and refer to figure 1 when disassem bling unit. Use papers or protective covering in front of fur nace 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 electrical junction box from the side of the fur

nace. 15 - Remove cold end header box. 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. 19 - 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. 20 - Back wash heat exchanger with soapy water solution

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

(135°C) .

21 - Thoroughly rinse and drain the heat exchanger. Soap

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

sembly.

Page 59

Page 60

22 - Reinstall heat exchanger into cabinet making sure that

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

23 - Re‐secure the supporting screws along the vestibule

sides and bottom to the cabinet. 24 - Reinstall cabinet screws on front flange at blower deck. 25 - Reinstall the primary limit on the vestibule panel. 26 - Route heating component wiring through hole in blow

er deck and reinsert strain relief bushing. 27 - Reinstall electrical junction box. 28 - Reinstall the cold end header box. 29 - Reinstall the combustion air inducer. Reconnect the

4-pin plug to the wire harness. 30 - Reinstall pressure switches and reconnect pressure

switch wiring. 31 - Carefully connect combustion air pressure switch

hosing from pressure switches to proper stubs on

cold end header collector box. 32 - Reinstall condensate trap. 33 - Use securing screws to reinstall flue collar to the top

cap on the furnace. Reconnect exhaust piping and ex

haust drain tubing. 34 - Replace flexible exhaust adapter tee on combustion air

inducer and flue collar. Secure using two existing hose

clamps. 35 - Reinstall burner box assembly in vestibule area. 36 - Reconnect flame roll-out switch wires. 37 - Reconnect sensor wire and reconnect 2-pin plug from

ignitor. 38 - Secure burner box assembly to vestibule panel using

four existing screws. Make sure burners line up in

center of burner ports.

39 - Reinstall gas valve manifold assembly. Reconnect gas

supply line to gas valve. 40 - Reinstall burner box cover. 41 - Reconnect 2-pin plug to gas valve.

42 - Replace the blower compartment access panel. 43 - Refer to instruction on verifying gas and electrical con

nections when re-establishing supplies.

44 - 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.

45 - 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.

Page 60

Page 61

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 inte grated 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 ener gized at ignition speed, which is approximately the same as the inducer speed at 70 percent firing rate.

Page 61

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 in ducer 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 mo tor 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

Page 62

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 de mand.

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 in creases 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 in creases, 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 fieldselected indoor blower off delay begins. The combus tion 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 inte grated 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 ener gized 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 ig nitor warm-up period begins. The combustion air in ducer 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 igni tion 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 in door 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 in ducer at high speed. The indoor blower motor is ad justed 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 in ducer begins a 20-second post-purge. The field-se lected 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)

2. Once the control receives a signal that the low-fire pressure s begins a 15-second pre-purge at the ignition speed.

3. After the pre-purge is complete, a 20-second initial ig nitor warm-up period begins. The combustion air in ducer 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 ad justed to the appropriate target rate. The inducer will remain at the 70 percent speed as long as the thermo stat 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 inte grated control energizes the combustion air inducer at high speed. The control also checks the high-fire pres sure 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 fieldselected indoor blower off delay begins. The combus tion 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.

witch has closed, the combustion air inducer

Page 62

Page 63

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

On (100% rate

Indoor Blower

Inducer On

Air Inducer

speed)

ON (70%)

Pressure

Switch

Open?

YES

Indoor blower OFF

Heat OFF Delay (Low Heat Speed)

Error Code

High

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 CAL L FOR HE AT, OR B Y CYCLING POWER TO THE CONTROL.

HARD LOCKOU T IS RESE T B Y 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 63

Page 64

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 64

Page 65

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 65

Page 66

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

Indoor Blower On

Delay Timer Started

Flame

Sensed Within

4 seconds?

YES

Ignitor OFF

Set to

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?

SOFT LOCKOUT IS RESE T AUTOMATICALLYAFTER ONE HOUR WITH A CALL FOR HEATACTIVE, OR BY CYCLINGTHE CALL FOR HEAT, 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 66

Page 67

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

De−Energize 2nd

(Compressor & Fan)

Cooling Request

De−Energize 1st

(Compressor & Fan)

De−Energize Indoor Blower

Per Ramping Profile

Energize Indoor Blower

2nd Stage

Still Active?

Stage Cooling

Contactor

1st Stage

Still Active?

Stage Cooling

Contactor

YES

(High Cooling mode)

YES

Maintain Indoor Blower

(High Cooling mode)

Energize and

Maintain Indoor Blower at

Low Cooling mode

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 67

Page 68

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

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

Blower at set speed

Maintain Indoor

Go to Call for Cooling

Go to Call for Heat − 2 Stage

Go to Call for Heat − Single Stage

Thermostat

Page 68

Page 69

IX- Field Wiring

Thermostat

TABLE 34

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 69

Page 70

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 dehumidifica tion 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 70

Page 71

Thermostat

Dual Fuel Single Stage Heat Pump

ComfortSense 7000 L7742U thermostat w/ dual fuel capa bilities Capable of 2 stage gas heat control

TABLE 34

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

L7742U T'STAT

CONTROL

TERM. STRIP

HEAT PUMP

67M41*

Dual Fuel Two Stage

DIP Switch 1

OFF

Cut Intact Cut

Heat Pump

ComfortSense 7000 L7742U thermostat w/ dual fuel capa bilities Capable of 2 stage gas heat control

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

L7742U T'STAT

CONTROL TERM.

STRIP

67M41*

outdoor

sensor

HEAT PUMP

out blue

outdoor sensor

Page 71

Lennox SLP98DF090XV60C, SLP98DF110XV60C, SLP98DF090XV36C, SLP98DF090XV48C, SLP98DF070XV36B Handbook

Specifications and Main Features

Frequently Asked Questions

User Manual

SPECIFICATIONS

BLOWER DATA

Configuring Unit Size Codes