Page 1: Table Of Contents
D The Lennox icomfort Wi-Fi ® thermostat must be AIR FLOW used in communicating applications. D In non-communicating applications, the Lennox WARNING ® ComfortSense 7000 thermostat may be used, as well as other non-communicating thermostats. Improper installation, adjustment, alteration, service In all cases, setup is critical to ensure proper system or maintenance can cause property damage, person...
Page 2: Unit Dimensions
Unit Dimensions - inches (mm) 9/16 (14) COMBUSTION AIR INTAKE RETURN AIR OPENING EXHAUST AIR OUTLET 2−1/16 (52) 9/16 2−1/4 (57) (14) (127) TOP VIEW 1−1/2 (38) 27−3/4 (705) Front Panel 6−1/4 (157) 9/16 19−7/16 9/16 1 (25) (14) (494) (14) FLOW 1−7/8 (48)
Page 3: Parts Arrangement
Parts Arrangement CONTROL BOX (includes variable capacity integrated control, transformer, circuit breaker and door switch) BLOWER ASSEMBLY (Variable Speed Blower Motor Is Hidden) BAG ASSEMBLY BLOWER SIDE VENT ACCESS PATCH PLATE PANEL ACCESS PANEL COMBUSTION AIR INDUCER PRIMARY LIMIT GAS VALVE BURNER BOX ASSEMBLY FIGURE 1 Page 3...
Page 4: Slp98Dfv Gas Furnace
SLP98DFV Gas Furnace Safety Information The SLP98DFV category IV gas furnace is equipped with a WARNING variable-capacity, variable-speed integrated control. This control ensures compatibility with the Lennox icomfort Wi- Improper installation, adjustment, alteration, service ® thermostat and Harmony IIIt zone control system, as or maintenance can cause property damage, person...
Page 5: Use Of Furnace As A Construction Heater
Very low return air temperatures, harmful vapors and op eration of the unit with clogged or misplaced filters will dam age the unit. Dampers SLP98DFV units may be used for heating of buildings or Dampers (open during cooling (open during heating...
Page 6: General
[24 inches (610 mm) at unit front]. The unit must be level from side to side. Unit may be posi SLP98DFV unit should not be installed in areas nor tioned from level to 1/2” toward the front to aid in draining.
Page 7 NOTE - The 1/2 hp blower motor used in some SLP98DFV The unit may be installed three ways in downflow applica tions: on non-combustible flooring, on combustible flooring unit is equipped with three flexible legs and one rigid leg. using a base, or on a reverse-flow cooling coil cabinet. Do The rigid leg is equipped with a shipping bolt and a flat white not drag the unit across the floor in the downflow posi...
Page 8 TABLE 1 NON-COMBUSTIBLE FLOOR OPENING SIZE SLP98DF UNIT Front to Rear Side to Side Cabinet Width SUPPLY AIR B Cabinet (17.5”) 19 - 3/4 16 - 5/8 PLENUM C Cabinet (21”) 19 - 3/4 20-1/8 PROPERLY COMBUSTIBLE SIZED FLOOR NOTE - Floor opening dimensions listed are 1/4 inch (6 mm) larger than FLOORING BASE OPENING the unit opening.
Page 9: Filters
Before using any filter with this system, check the specifications provided by the filter manufacturer Return Air Opening -- Downflow Units against the data given in the appropriate Lennox Product Specifications bulletin. Additional informa Return air may be brought in only through the top opening tion is provided in Service and Application Note of a furnace installed in the downflow position.
Page 10: Pipe And Fittings Specifications
4 for approved piping and fitting materials. IMPORTANT TABLE 4 PIPING AND FITTINGS SPECIFICATIONS SLP98DFV exhaust and intake connections are Schedule 40 PVC (Pipe) D1785 made of PVC. Use PVC primer and solvent cement Schedule 40 PVC (Cellular Core Pipe) F891 when using PVC vent pipe.
Page 11 TABLE 5 OUTDOOR TERMINATION USAGE* STANDARD CONCENTRIC Flush Wall Kit Wall Ring Kit 1-1/2 inch 2 inch 3 inch Mount Vent 2 inch 3 inch 2 inch Pipe Input Size Field Dia. in. 51W11 71M80 69M29 Fabricated 44J40 (US) 22G44 (US) (US) (US) 60L46 (US)
Page 12: Venting Options
Venting Options IMPORTANT The SLP98DF is shipped with vent exhaust / air intake con Side vent sealing plates and side vent sealing gas nection at the top cap. See figure 13. Using parts provided, kets must be used when converting to right side the furnace may be field modified to have these connec...
Page 13: Joint Cementing Procedure
Right Side Vent Configuration Side Vent Sealing Plate Side Vent Sealing Gaskets Exhaust Intake Street Elbows (2) FIGURE 15 6 - Promptly apply solvent cement to end of pipe and in Joint Cementing Procedure side socket surface of fitting. Cement should be ap All cementing of joints should be done according to the plied lightly but uniformly to inside of socket.
Page 14: Venting Practices
Centrotherm venting system must also follow the uninsulated and unconditioned space criteria listed in table 9. The SLP98DFV is installed only as a Direct Vent gas If an SLP98 furnace replaces a furnace which was com central furnace.
Page 15 In some applications which permit the use of several differ furnace capacity? ent sizes of vent pipe, a combination vent pipe may be 070, 090 or 110? used. Contact Lennox' Application Department for assis tance in sizing vent pipe in these applications. TABLE 6 Which style termination...
Page 16 TABLE 7 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. 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' 2”...
Page 17 TABLE 7 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' 2”...
Page 18 TYPICAL EXHAUST PIPE CONNECTIONS AND CONDENSATE TRAP INSTALLATION 2” 2” 2” DO NOT transition from smaller to larger pipe size in horizontal runs of exhaust pipe. 3” TRANSITION *2“ Exhaust Air Intake TOP VIEW * When transitioning up in pipe size, use the shortest length of 2” PVC pipe possible. NOTE −...
Page 19 TYPICAL EXHAUST CONNECTIONS WITH RIGHT SIDE VENT OPTION Pipe Length 4” Maximum (Not Furnished) 3” 2” 2” TRANSITION *2” 2” Plate (Furnished) Street Ell TOP VIEW (Not Furnished) * 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.
Page 20: Vent Termination Clearances
‡ 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. FIGURE 23 Page 20...
Page 21 Armaflex with doors. The SLP98DFV is classified as a direct vent, Cate UV protection is permissable. Basements or other en gory IV gas furnace.
Page 22 TABLE 8 Maximum Allowable Vent Pipe Length (in ft.) Without Insulation In Unconditioned Space For Winter Design Temperatures Modulating High Efficiency Furnace Unit Input Size Winter Design Vent Pipe Temperatures °F (°C) Diameter 2 in. 32 to 21 (0 to -6) 2-1/2 in.
Page 23 NOTE - Care must be taken to avoid recirculation of exhaust back into intake pipe. Exiting Exhaust and Intake Vent TABLE 9 (different pressure zones) EXHAUST PIPE TERMINATION SIZE REDUCTION SLP98DFV Termination Pipe Size MODEL Roof T erminated *070 1-1/2”...
Page 24: Front View
51W11 (US) or 51W12 (Canada) shown in figure 31. FIGURE 30 1-1/2” (38mm) accelerator provided on 71M80 & 12” 44W92 kits for EXHAUST (305mm) SLP98DFV-36B-070 VENT 5-1/2” 5” (140mm) (127mm) INTAKE FLASHING 12” (305mm) INTAKE...
Page 25 FIELD FABRICATED WALL TERMINATION NOTE − FIELD−PROVIDED REDUCER MAY BE 2” (51mm) 3” (76mm) REQUIRED TO ADAPT LARGER VENT PIPE SIZE Vent Pipe Vent Pipe TO TERMINATION A− Minimum clearance above grade or average 12” (305 mm) 12” (305 mm) snow accumulation B−...
Page 26 Condensate Piping 3 - Install the cap over the clean out opening at the base This unit is designed for either right‐ or left‐side exit of con of the trap. Secure with clamp. See figure 40. densate piping. Refer to figures 34 and 36 and for conden 4 - Install drain trap using appropriate PVC fittings, glue sate trap locations.
Page 27 Heat cable kit is avail Coil Using a Common Drain able from Lennox in various lengths; 6 ft. (1.8m) - kit no. 26K68 and 24 ft. (7.3m) - kit no. 26K69. CONDENSATE TRAP LOCATION...
Page 28 TRAP / DRAIN ASSEMBLY USING 1/2” PVC OR 3/4” PVC 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) Adapter 3/4 inch slip X 3/4 inch mpt (not furnished) Condensate Drain Connection In Unit 1 (25 mm) Min.
Page 29: Gas Piping
Gas Piping IMPORTANT CAUTION Compounds used on threaded joints of gas piping must be resistant to the actions of liquified petro If a flexible gas connector is required or allowed by leum gases. the authority that has jurisdiction, black iron pipe shall be installed at the gas valve and extend outside MANUAL MAIN SHUT-OFF the furnace cabinet.
Page 30 TABLE 10 GAS PIPE CAPACITY - FT /HR (kL/HR) Length of Pipe-Feet(m) Nominal Internal Iron Pipe Size Diameter -Inches(mm) -Inches(mm) (3.048) (6.096) (9.144) (12.192) (15.240) (18.288) (21.336) (24.384) (27.432) (30.480) .622 (12.7) (17.799) (4.96) (3.40) (2.75) (2.32) (2.07) (1.87) (1.73) (1.61) (1.50) (1.42)
Page 31: Electrical
NOTE - Do NOT make a wire connection between OUTSIDE the room thermostat L terminal and the L terminal CABINET of the SLP98DFV integrated control unless this is a communicating thermostat installation with a non- communicating outdoor unit. Right Side...
Page 32 Thermostat Selection on the furnace integrated control. Any electronic air The SLP98DFV is designed to operate in a variable rate ca cleaner rated up to one amp can be connected to this pacity mode using a two-stage thermostat. The SLP98DFV terminal with the neutral leg of the circuit being con...
Page 33 -ENABLED Outdoor Unit ® icomfort Wi-Fi Thermostat ® icomfort Wi-Fi Thermostat ® ® icomfort -Enabled SLP98DFV Indoor Furnace icomfort -Enabled SLP98DFV Indoor Furnace ® Non-Communicating Outdoor Air Conditioner icomfort -Enabled Outdoor Air Conditioner or Heat Pump ® icomfort ENABLED ®...
Page 34 NOTE: icomfort Wi-Fi THERMOSTAT SENSES HUMIDITY & CON ENABLED TROLS 24V “H” OUTPUT (& 120V “H” OUTPUT) TO CYCLE HUMIDI SLP98DFV FIER BASED ON DEMAND. NO OTHER CONTROL OR HUMIDIS FURNACE TAT REQUIRED. OPTIONAL OUTDOOR AIR SENSOR FOR USE WITH HU...
Page 35 TABLE 14 Field Wiring Connections for Non-Communicating Thermostat Applications DIP Switch Settings and On-Board Links (figure 47) W914 W915 (DS to R) W951 (Y1 to Y2) Dehumidifi Thermostat Wiring Connections DIP Switch 1 (O to R) Two-Stage cation or Heat Pumps Cooling Harmony IIIt...
Page 36 TABLE 14 Field Wiring for Non-Communicating Applications (Continued) DIP Switch Settings and On-Board Links (figure 47) W914 W915 (DS to R) (Y1 to Y2) W951 Dehumidifi Thermostat Wiring Connections Two-Stage DIP Switch 1 (O to R) cation or Cooling Heat Pumps Harmony IIIt 2 Heat / 2 Cool...
Page 37 * Connect W1 to W1 ONLY if using defrost tempering kit 67M41 NOTE - Do NOT make a wire connection between the room thermostat L terminal and the L terminal of the SLP98DFV integrated control. Page 37...
Page 38 TYPICAL SLP98DFV WIRING DIAGRAM FIGURE 46 Page 38...
Page 39: Integrated Control
Integrated Control INTEGRATED CONTROL NEUTRAL TERMINALS COMBUSTION AIR INDUCER CONNECTOR IGNITOR FLAME CONNECTOR SENSE DIAGNOSTIC LINE VOLTAGE PUSH BUTTON TERMINALS DIP SWITCHES INDOOR BLOWER CONNECTOR OUTDOOR AIR SENSOR TERMINALS 7-SEGMENT DIAGNOSTIC LED W915 Y1 TO Y2 DISCHARGE AIR SENSOR W951 R TO O TERMINALS W914 R TO DS FACTORY TEST...
Page 40 3rd stage delay 10 minutes fixed Two-Stage Heat (W1 70%, W2 100%) Two-Stage NOTE - When the SLP98DFV is used with an icomfort Wi- (time that the blower operates after the heating demand ® thermostat, all indoor blower speed selections and DIP has been satisfied) can be adjusted by moving switches 4 switch settings are made by the communicating thermo...
Page 41 Switches 8 and 9 -- Cooling Mode Blower Speed -- The TABLE 20 Cooling Mode Blower Speed Ramping unit is shipped from the factory with the DIP switches posi Ramping Option Switch 12 Switch 13 tioned for high speed (4) indoor blower motor operation A (Factory) during the cooling mode.
Page 42 Refer to table 24 for operation sequence in ap form the high-fire and low-fire pressure switch calibra plications including SLP98DFV, a thermostat which fea tions and display “CAL”. After calibration, the LED will tures humidity control and a single-speed outdoor unit.
Page 43: Blower Motor Performance
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. Page 43...
Page 44 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 450 cfm. Lennox Harmony III™ Zoning System Applications - Minimum blower speed is 450 cfm. Page 44...
Page 45 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 450 cfm. Lennox Harmony III™ Zoning System Applications - Minimum blower speed is 450 cfm. Page 45...
Page 46 TABLE 24 COOLING OPERATING SEQUENCE SLP98DFV and Single-Stage Outdoor Unit OPERATING SYSTEM DEMAND SYSTEM RESPONSE SEQUENCE Demand Relative Humidity Blower System Step Compressor Comments Condition Status (COOL) stage NO CALL FOR DEHUMIDIFICATION Compressor and indoor Normal Operation Acceptable High 100%...
Page 47 TABLE 25 COOLING OPERATING SEQUENCE SLP98DFV and Two-Stage Outdoor Unit OPERATING SYSTEM DEMAND SYSTEM RESPONSE SEQUENCE Demand Relative Humidity Blower System Step Compressor Comments Condition Status (COOL) stage stage NO CALL FOR DEHUMIDIFICATION Normal Operation - Acceptable Compressor and indoor...
Page 48: Unit Start Up
WARNING The gas valve on the SLP98DFV is equipped with a gas control switch. Use only your hand to move the control Do not use this furnace if any part has been underwa...
Page 49: Gas Pressure Measurement
4500 feet (1372 m) is the jurisdiction of local au and compare to the tables below. The maximum carbon thorities. monoxide reading should not exceed 50 ppm. SLP98DFV units require no manifold pressure adjust TABLE 27 ments for operation at altitudes up to 10,000 feet (3048 m) High Fire above sea level.
Page 50 Operating pressure signal can be taken while the manifold tive burner box must be considered. Use pressure test pressure pressure check is taken (using two measuring de adapter kit (available as Lennox part 10L34) to assist in vices). Or, taken after the manifold pressure measurement measurement.
Page 51 MANIFOLD PRESSURE MEASUREMENT Gas Valve Field Installed FIGURE 49 Negative Port Operating Signal (Delta P) Measurement Positive Port Red and Black Tubing - Black Tubing + Gas Valve Field Installed Measuring Device FIGURE 50 Page 51...
Page 52: Other Unit Adjustments
Temperature Rise Other Unit Adjustments After the furnace has been started and supply and return air temperatures have been allowed to stabilize, check the Primary Limit temperature rise with the unit operating at 100 percent fir The primary limit is located on the heating compartment ing rate.
Page 53 2 - Once the control receives a signal that the low-fire door blower motor is energized at a speed that pressure switch has closed, the combustion air induc matches the firing rate. After the 10-second ignition er begins a 15-second pre-purge in the ignition speed. stabilization delay expires, the inducer speed is ad...
Page 54: Service
At the beginning of each heating season, and to comply ation. Consult Service Literature for proper combustion with the Lennox Limited Warranty, your system should be checked as follows: values. Page 54...
Page 55: Repair Parts List
15 - Replace heating compartment access panel. Repair Parts List The following repair parts are available through Lennox dealers. When ordering parts, include the complete furnace model number listed on the nameplate -- Example: SLP98DF070V36B. All service must be performed by a licensed profes...
Page 56: Integrated Control Diagnostic Codes
Integrated Control Diagnostic Codes Press the diagnostic push button and hold it to cycle through a menu of options. Every five seconds a new menu item will be displayed. Release the button when the desired mode is displayed. When a solid ”P” is displayed, the furnace capacity/ size is programmed. When the solid “E”...
Page 57 Integrated Control Diagnostic Codes (continued) Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E 202 Indoor blower motor mis-match - Indoor motor horsepower does not match unit Incorrect furnace size code selected. Check unit size capacity. codes on configuration guide or in installation instructions. E 203 Appliance capacity / size is NOT programmed.
Page 58 Integrated Control Diagnostic Codes (continued) Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E 292 Indoor blower motor unable to start - Seized bearings, stuck wheel, etc. Indoor blower motor unable to start (seized bearing, stuck wheel, etc), replace motor or wheel if assembly does not operate or meet performance.
Page 59: Configuring Unit Size Codes
Configuring Unit Size Code − − 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: Furnace control in IDLE mode No heating, cooling or indoor fan operation)
Page 60: Troubleshooting
Troubleshooting: Heating Sequence of Operation IGNITION AND CALL FOR LOW FIRE WITH TWO-STAGE THERMOSTAT Safety Check Verify There Is No Main Burner Flame After Indoor blower OFF Heat OFF Delay (Low Heat Speed) Limit Combustion Air Limit De-Energize Error Code Indoor Blower Inducer On Switch...
Page 61 Troubleshooting: Heating Sequence of Operation (Continued) CALL FOR HIGH FIRE WITH TWO-STAGE THERMOSTAT 2 Stage Thermostat 1st Call for High Fire? 2nd Stage Recognition Delay (30 Seconds) Combustion Air Inducer ON (100% Rate Speed) High Pressure Switch Increase Combustion Error Code Wait 5 Closes Within Air Inducer Speed...
Page 62 Troubleshooting: Heating Sequence of Operation (Continued) CALL FOR HEAT SATISFIED RUN MODE (TWO-STAGE THERMOSTAT) RUN MODE (SINGLE-STAGE THERMOSTAT) FIRST OR SECOND-STAGE CALL FOR HEAT ALL INPUTS MONITORED (LIMIT, PRESSURE, ALL INPUTS MONITORED (LIMIT, PRESSURE, CALL FOR HEAT/COOL, FLAME LEVEL). CALL FOR HEAT/COOL, FLAME LEVEL). 2nd Stage Heat 2nd Stage Call for Heat...
Page 63 Troubleshooting: Heating Sequence of Operation (Continued) IGNITION AND CALL FOR HEAT WITH SINGLE-STAGE THERMOSTAT Safety Check Verify There Is No Main Burner Indoor Blower OFF After Flame Heat OFF Delay (Low Heat Speed) Indoor Blower Limit Limit De-Energize Combustion Air Error Code Switch Closes Within 3...
Page 64 Troubleshooting: Cooling Sequence of Operation 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) 1st Stage 2nd Stage Cooling Request Cooling Still Active? Request? Energize 2nd Stage...
Page 65 Troubleshooting: Continuous Fan Sequence of Operation CONTINUOUS LOW SPEED INDOOR BLOWER SEQUENCE OF OPERATION Call for Continuous Blower Indoor Blower On (Speed Determined by Dip Switch settings) Request Maintain Indoor for Cooling Go to Call for Cooling Blower at set speed Received? Go to Call for Heat -- Two-Stage Thermostat Request...
Page 66 Requirements for Commonwealth of Massachusetts Modifications to NFPA-54, Chapter 10 4 - INSPECTION. The state or local gas inspector of the side wall, horizontally vented, gas-fueled equipment Revise NFPA-54 section 10.8.3 to add the following re shall not approve the installation unless, upon inspec quirements: tion, the inspector observes carbon monoxide detec...
Page 67 ADDENDUM FOR THE PROVINCE OF SASKATCHEWAN See below for venting in the province of Saskatchewan. Lennox approves the following termination for use in Saskatchewan Canada. 12” 3” (76MM) 2”...

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