Page 2 - FRONT VIEW
Page 2 Unit Dimensions − inches (mm) AIR EXHAUST AIR OUTLET COMBUSTION AIR INTAKE FLOW 2 − 1/16 (52) 090V48C A B C D SLP98DF Model No. in. mm in. mm in. mm in. mm 070V36B 17 − 1/2 446 16 − 3/8 416 16 406 7 − 5/8 194 090V36C 21 533 19 − 7/8 505 19 − 1/2 495 9 − 3/8 238 090V60C 110V60C GAS PIPING INLE...
Page 3 - Parts Arrangement; FIGURE 1
Page 3 Parts Arrangement FIGURE 1 BURNER BOX ASSEMBLY GAS VALVE ACCESS PANEL COMBUSTION AIR INDUCER BLOWER ACCESS PANEL BLOWER ASSEMBLY (Variable Speed Blower Motor Is Hidden) BAG ASSEMBLY CONTROL BOX (includes variable capacity integrated control, transformer, circuit breaker and door switch) PRIMA...
Page 4 - SLP98DFV Gas Furnace; NOTE; Shipping and Packing List; Package 1 of 1 contains; Safety Information; WARNING; Building Codes
Page 4 SLP98DFV Gas Furnace The SLP98DFV category IV gas furnace is equipped witha variable−capacity, variable−speed integrated control.This control ensures compatibility with the Lennox icom-fort Touch thermostat and Harmony III zone control system, as well as a thermostat which provides humidityco...
Page 5 - or; AIR HANDLER; CAUTION; Use of Furnace as Construction Heater
Page 5 Installed in Combination with a Cooling Coil When this furnace is used with cooling units, it shall beinstalled in parallel with, or on the upstream side of, coolingunits to avoid condensation in the heating compartment.With a parallel flow arrangement, a damper (or other meansto control the ...
Page 6 - General; Product contains fiberglass wool.; Installation − Setting Equipment; The unit must be level from side to side. Unit may; Unit must be level side−to−side. Unit may be positioned
Page 6 General WARNING Product contains fiberglass wool. Disturbing the insulation in this product duringinstallation, maintenance, or repair will expose youto fiberglass wool. Breathing this may cause lungcancer. (Fiberglass wool is known to the State of Cal-ifornia to cause cancer.) Fiberglass woo...
Page 7 - Do; Downflow Application Installation Clearances; FIGURE 7
Page 7 NOTE − The 1/2 hp blower motor used in some SLP98DFV unit is equipped with three flexible legs and one rigid leg.The rigid leg is equipped with a shipping bolt and a flat whiteplastic washer (rather than the rubber mounting grommetused with a flexible mounting leg). The bolt and washer must b...
Page 8 - B Cabinet
Page 8 TABLE 1 NON−COMBUSTIBLE FLOOR OPENING SIZE Cabinet Width Front to Rear Side to Side in . mm in. mm B Cabinet (17.5") 19 − 3/4 502 16 − 5/8 422 C Cabinet (21") 19 − 3/4 502 20−1/8 511 NOTE − Floor opening dimensions listed are 1/4 inch (6 mm) larger than the unit opening. See dimension...
Page 9 - Return Air Opening −− Downflow Units; Side View; Side View; Filters; TABLE 3; Furnace; Duct System
Page 9 FIGURE 10 COOLING COIL PLENUM PROPERLY SIZED FLOOR OPENING SLP98DF UNIT Return Air Opening −− Downflow Units Return air may be brought in only through the top openingof a furnace installed in the downflow position. The follow-ing steps should be taken when installing plenum: 1 − Bottom edge o...
Page 10 - Pipe & Fittings Specifications; TABLE 4; IMPORTANT; Canadian Applications Only
Page 10 Pipe & Fittings Specifications All pipe, fittings, primer and solvent cement must conformwith 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 nolumps, undissolved particles or a...
Page 11 - Joint Cementing Procedure; DANGER; NOTE −
Page 11 TABLE 5 OUTDOOR TERMINATION KITS USAGE SLP98DF UNIT VENT PIPE DIA. (in.) STANDARD CONCENTRIC OutdoorExhaust Accelerator (Dia. X Length) OutdoorExhaust Accelerator (Dia. X Length) 2" Wall Plate Kit 3" Wall Plate Kit 2" Wall Ring Kit Flush-Mount Kit 1−1/2" Concentric Kit 2"...
Page 12 - Venting Practices; Piping Suspension Guidelines; Wall Thickness Guidelines; Vent Piping Guidelines
Page 12 Venting Practices FIGURE 13 * See table 4 for allowable pipe. Piping Suspension Guidelines NOTE − Isolate piping at the point where it exits the outside wall or roof in order to prevent transmission of vibration to the structure. SCHEDULE 40 PVC −− Support every 5 feet. all other pipe* −− Su...
Page 13 - btuh
Page 13 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 concerningsizing of vent systems which include multiple pipe sizes. NOTE − All horizontal runs of exhaust pipe must slope back toward unit....
Page 16 - TOP VIEW; TYPICAL AIR INTAKE PIPE CONNECTIONS; TOP VIEW
Page 16 FIGURE 16 TYPICAL EXHAUST PIPE CONNECTIONS AND CONDENSATE TRAP INSTALLATION TRANSITION 2” 2” 2” 3” Use only the factory − supplied trap. Trap can be installed on either side of cabinet within 5 ft. of the furnace. TRAP TOP VIEW Exhaust Air Intake DO NOT transition from smaller to larger pipe...
Page 18 - FIELD−SUPPLIED WALL TERMINATION OR; Vent Pipe; STRAIGHT
Page 18 Details of Intake and Exhaust Piping Terminations forDirect Vent Installations NOTE − In Direct Vent installations, combustion air is tak- en from outdoors and flue gases are discharged to out-doors. NOTE − Flue gas may be slightly acidic and may adversely affect some building materials. If ...
Page 20 - − On field−supplied terminations for side wall exit, ex-
Page 20 FIGURE 22 FIELD−SUPPLIED WALL TERMINATION OR (15F74) WALL RING TERMINATION KIT With INTAKE ELBOW See venting table 7 for maximum venting lengths with thisarrangement. * Use wall support every 24" (610 mm). Use two wall supports ifextension is greater than 24" (610 mm) but less than 4...
Page 25 - SL98DFV with Evaporator Coil; Gas Piping; Leak Check; FIRE OR EXPLOSION HAZARD
Page 25 CAUTION A separate drain line must be run to the drain fromthe condensate trap to ensure proper drainage andpressure switch operation. DO NOT connect the con-densate trap drain into the drain line from the evapo-rator coil. FIGURE 35 SL98DFV with Evaporator Coil Drain Condensate trap and eva...
Page 26 - GAS PIPE CAPACITY − FT
Page 26 GROUND JOINT UNION AUTOMATIC GAS VALVE (with manual shut−off valve) FIELD PROVIDED AND INSTALLED GROUND JOINT UNION Left Side Piping (Standard) Right Side Piping (Alternate) AUTOMATIC GAS VALVE (with manual shut−off valve) DRIP LEG DRIP LEG MANUAL MAIN SHUT−OFF VALVE (1/8 in. NPT plugged tap...
Page 27 - Electrical; Precautions and Procedures; INTERIOR MAKE−UP BOX
Page 27 1 − Seal any unused openings in the common venting sys- tem. 2 − Inspect the venting system for proper size and horizontal pitch. Determine that there is no blockage, restriction,leakage, corrosion, or other deficiencies which couldcause an unsafe condition. 3 − Close all building doors and ...
Page 28 - NOTE − Do NOT make a wire connection between; Run Length Communicating; Thermostat Selection
Page 28 1 − The power supply wiring must meet Class I restric- tions. Protected by either a fuse or circuit breaker, se-lect circuit protection and wire size according to unitnameplate. NOTE − Unit nameplate states maximum current draw. See table for maximum over−current protection. TABLE 11 SLP98DF...
Page 35 - TYPICAL SLP98DFV WIRING DIAGRAM
Page 36 - Integrated Control; INTEGRATED CONTROL
Page 36 Integrated Control INTEGRATED CONTROL THERMOSTAT CONNECTIONS (TB1) 1/4" QUICK CONNECT TERMINALS FIGURE 44 RS−BUS LINK (TB82, future use) I+ = DATA HIGH CONNECTIONI − = DATA LOW CONNECTION RS−BUS OUTDOOR (TB83) R = 24VACI + = DATA HIGH CONNECTIONI − = DATA LOW CONNECTIONC = 24VAXC COMMON ...
Page 37 - Continuous Indoor Blower Operation −− Blower Speeds
Page 37 TABLE 15 Non−Communicating Thermostat Selection Switch Settings Operation Thermostat Switch 1 Switch 2 Switch 3 Variable Capacity Heat (35% to 100%) Two−Stage Off On Off Three−Stage Heat (35%, 70%, 100%) Single−Stage On Off 2nd stage delay OFF = 7 minutes ON = 12 minutes 3rd stage delay 10 m...
Page 39 - Normal; On−Board Links
Page 39 Switches 14 through 19 −− Heating Mode Blower Speed−− These switches are factory set at the OFF position which provides 100 % of normal speed during HIGH HEAT de-mand, 70% of normal speed during MID−RANGE HEATdemand and 35% of normal speed during LOW HEAT de-mand. Switches 14, 15 and 16 are ...
Page 40 - BLOWER DATA
Page 40 BLOWER DATA SLP98DF070V36B BLOWER PERFORMANCE (less filter)HEATING BLOWER PERFORMANCE Heating Adjust CFM Selections Heating Input Range and Blower Volume - CFM 35% 40% 50% 60% 70% 80% 90% 100% Increase (+15%) Heat CFM 495 543 639 735 830 926 1022 1118 Increase (+7.5%) Heat CFM 473 516 604 69...
Page 42 - HEATING BLOWER PERFORMANCE; COOLING BLOWER PERFORMANCE
Page 42 BLOWER DATA SLP98DF110V60C BLOWER PERFORMANCE (less filter) HEATING BLOWER PERFORMANCE Heating Adjust CFM Selections Heating Input Range and Blower Volume - CFM 35% 40% 50% 60% 70% 80% 90% 100% Increase (+15%) Heat CFM 811 906 1096 1286 1475 1665 1855 2045 Increase (+7.5%) Heat CFM 744 835 1...
Page 43 - NO CALL FOR DEHUMIDIFICATION
Page 43 TABLE 24 COOLING OPERATING SEQUENCE SLP98DFV and Single−Stage Outdoor Unit OPERATING SEQUENCE SYSTEM DEMAND SYSTEM RESPONSE System Condition Step Demand Relative Humidity Compressor Blower CFM (COOL) Comments 1st stage O G Status D* NO CALL FOR DEHUMIDIFICATION Normal Operation 1 On On On Ac...
Page 45 - Unit Start−Up
Page 45 Unit Start−Up FOR YOUR SAFETY READ BEFORE OPERATING WARNING Do not use this furnace if any part has been under-water. A flood−damaged furnace is extremely dan-gerous. Attempts to use the furnace can result infire or explosion. Immediately call a qualified ser-vice technician to inspect the f...
Page 46 - High Altitude Information; Gas Pressure Measurement
Page 46 9 − Replace the access panel. 10− Turn on all electrical power to to the unit. 11− Set the thermostat to desired setting. NOTE − When unit is initially started, steps 1 through 11 may need to be repeated to purge air from gas line. 12− If the appliance will not operate, follow the instructio...
Page 47 - Proper Combustion; Use pressure test; Do not attempt to make adjustments to the gas valve.; Other Unit Adjustments
Page 47 Proper Combustion Furnace should operate minimum 15 minutes with correctmanifold pressure and gas flow rate before checking com-bustion. Take combustion sample beyond the flue outletand compare to the tables below. The maximum carbonmonoxide reading should not exceed 50 ppm. TABLE 28 High Fi...
Page 48 - Heating Sequence of Operation
Page 48 Temperature Rise After the furnace has been started and supply and return airtemperatures have been allowed to stabilize, check thetemperature rise with the unit operating at 100 percent fir-ing rate. If necessary, adjust the blower speed to maintainthe temperature rise within the range show...
Page 49 - Applications Using A Single−Stage Thermostat
Page 49 closed contacts and pressure switches for normallyopen contacts. The combustion air inducer is ener-gized at ignition speed, which is approximately thesame 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...
Page 50 - Service
Page 50 Service WARNING ELECTRICAL SHOCK, FIRE, OR EXPLOSION HAZARD. Failure to follow safety warnings exactly could resultin dangerous operation, serious injury, death orproperty damage.Improper servicing could result in dangerous opera-tion, serious injury, death, or property damage.Before servici...
Page 52 - Planned Service
Page 52 Planned Service A service technician should check the following items dur-ing an annual inspection. Power to the unit must be shut offfor the service technician’s safety. Burners − Must be inspected for rust, dirt, or signs of water. Vent pipe − Must be inspected for signs of water, cracked,...
Page 53 - Integrated Control Diagnostic Codes
Page 53 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 i...
Page 54 - Integrated Control Diagnostic Codes (continued)
Page 54 Integrated Control Diagnostic Codes (continued) Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E 223 Low pressure switch failed open − Refer to troubleshooting in installationinstruction. Check inches of water column pressure during operationof low pressure sw...
Page 56 - Configuring Unit Size Code; FINISHED
Page 56 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, furnacecontrol does not recognize unit size code. Configure per the following: Furnace cont...
Page 57 - Troubleshooting: Heating Sequence of Operation; IGNITION AND CALL FOR LOW FIRE WITH TWO−STAGE
Page 57 Troubleshooting: Heating Sequence of Operation IGNITION AND CALL FOR LOW FIRE WITH TWO−STAGE THERMOSTAT Call For 2nd Stage Heat Call For Heat Satisfied Limit Switch Closed? Limit Closes Within 3 Minutes? NO Soft Lockout: Error Code Flashes flashes YES Rollout Circuit Closed? Low Pressure Swi...
Page 58 - CALL FOR HIGH FIRE WITH TWO−STAGE THERMOSTAT
Page 58 Troubleshooting: Heating Sequence of Operation (Continued) CALL FOR HIGH FIRE WITH TWO−STAGE THERMOSTAT 1st Call for High Fire? Wait for Call for Heat Satisfied 2 Stage Thermostat 2nd Stage Recognition Delay (30 Seconds) YES High Pressure Switch Closes Within 10 Seconds? NO Error Code Flashe...
Page 59 - CALL FOR HEAT SATISFIED
Page 59 Troubleshooting: Heating Sequence of Operation (Continued) CALL FOR HEAT SATISFIED 1st Stage Heat 2nd Stage Heat 2nd Stage Call for Heat satisfied? NO 1st Stage Call for Heat satisfied? Gas valve De−Energized YES NO 1 4 3A 3B YES OR Combustion Air Inducer switched to 70% rate speed Adjust In...
Page 60 - IGNITION AND CALL FOR HEAT WITH SINGLE−STAGE THERMOSTAT
Page 60 Troubleshooting: Heating Sequence of Operation (Continued) IGNITION AND CALL FOR HEAT WITH SINGLE−STAGE THERMOSTAT Call For Heat Satisfied Limit Switch Closed? Limit Closes Within 3 Minutes? NO Soft Lockout: Error Code Flashes flashes YES Rollout Circuit Closed? Low Pressure Switch Open? Low...
Page 61 - Troubleshooting: Cooling Sequence of Operation; CALL FOR COOLING
Page 61 Troubleshooting: Cooling Sequence of Operation CALL FOR COOLING 1st Stage Cooling Request Received Energize 1st Stage Cooling Contactor (Compressor & Fan) 2nd Stage Cooling Request? YES 2nd Stage Cooling Request Still Active? De−Energize 1st Stage Cooling Contactor (Compressor & Fan)...
Page 62 - Troubleshooting: Continuous Fan Sequence of Operation; CONTINUOUS LOW SPEED INDOOR BLOWER SEQUENCE OF OPERATION
Page 62 Troubleshooting: Continuous Fan Sequence of Operation CONTINUOUS LOW SPEED INDOOR BLOWER SEQUENCE OF OPERATION (Speed Determined by Dip Switch settings) De−Energize Ramping Profile NO Request for Heat Received? Request for CoolingReceived? NO YES Call for Fan Removed? YES NO YES Go to Call f...
Page 63 - Repair Parts List; All service must be performed by a licensed profes-
Page 63 Repair Parts List The following repair parts are available through Lennox dealers. When ordering parts, include the complete furnace modelnumber listed on the nameplate −− Example: SLP98DF070V36B. All service must be performed by a licensed profes- sional installer (or equivalent), service a...
Page 64 - Requirements for Commonwealth of Massachusetts; Modifications to NFPA−54, Chapter 10
Page 64 Requirements for Commonwealth of Massachusetts Modifications to NFPA−54, Chapter 10 Revise NFPA−54 section 10.8.3 to add the following re-quirements: For all side wall, horizontally vented, gas−fueled equipmentinstalled in every dwelling, building or structure used inwhole or in part for res...
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