Lennox SLP98UHV Installation Instructions Manual

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Dallas, Texas USA

WARNING

Improper installation, adjustment, alteration, service

or maintenance can cause property damage, personal

injury or loss of life. Installation and service must be

performed by a licensed professional HVAC installer or

equivalent, service agency, or the gas supplier.

Contents

Unit Dimensions .............................................................2

Parts Arrangement..........................................................3

SLP98UHV Gas Furnace ...............................................4

Shipping and Packing List ..............................................4

Safety Information ..........................................................4

Use of Furnace as Cinstruction Heater ..........................5

General ...........................................................................6

Installation - Setting Equipment ......................................6

Filters ............................................................................10

Duct System ................................................................. 11

Pipe Fittings Specifications........................................... 11

Joint Cementing Procedure ..........................................12

Venting Practices ..........................................................13

Vent Pipe Guidelines ....................................................13

Gas Piping ....................................................................27

Electrical .......................................................................30

INSTALLATION

INSTRUCTIONS

SLP98UHV

DAVE LENNOX SIGNATURE®

COLLECTION GAS FURNACES

UP/FLOW HORIZONTAL AIR DISCHARGE

507026-02

05/2016

Superseds 507026-01

THIS MANUAL MUST BE LEFT WITH THE

HOMEOWNER FOR FUTURE REFERENCE

This is a safety alert symbol and should never be

ignored. When you see this symbol on labels or in man-

uals, be alert to the potential for personal injury or death.

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.

A thermostat is not included and must be ordered

separately.

• The Lennox iComfort Wi-Fi

in communicating applications.

• In non-communicating applications, the Lennox

ComfortSense

7500 thermostat may be used, as well

as other non-communicating thermostats.

In all cases, setup is critical to ensure proper system

operation.

Field

wiring

for

communicating applications is illustrated in diagrams,

which begin on Page 25.

Integrated Control .........................................................38

Unit Start-Up .................................................................47

Turning Off Gas to Unit .................................................48

Failure To Operate ........................................................48

Unit Start-Up .................................................................48

Gas Flow ......................................................................48

Operating Pressure Signal Measurement ....................48

Proper Combustion.......................................................50

High Altitude Information ..............................................50

Other Unit Adjustments.................................................50

Heating Sequence of Operation ...................................51

Service..........................................................................53

Repair Parts List ...........................................................55

Integrated Control Diagnostic Codes............................56

Configuring Unit Size Codes ........................................59

Troubleshooting: Heating Sequence of Operation .......60

Page 1

CAUTION

NOTICE

thermostat must be used

both

communicating

and

non-

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Summary of Contents for Lennox SLP98UHV

Page 1: Table Of Contents
A thermostat is not included and must be ordered separately. • The Lennox iComfort Wi-Fi thermostat must be used ® in communicating applications. • In non-communicating applications, the Lennox ComfortSense 7500 thermostat may be used, as well ® WARNING as other non-communicating thermostats.
Page 2: Unit Dimensions
Unit Dimensions - inches (mm) NOTE - 60C and 60D size units that require second stage EXHAUST AIR 3-1/4 air volumes over 1800 cfm must have one OUTLET (83) of the following: 1. Single side return air with transition, to accommodate 1-7/8 (48) 20 x 25 x 1 in.
Page 3: Parts Arrangement
Parts Arrangement BURNER BOX ASSEMBLY PRESSURE SWITCHES HEAT EXCHANGER VARIABLE CAPACITY PRIMARY LIMIT GAS VALVE VARIABLE SPEED COMBUSTION AIR INDUCER BAG ASSEMBLIES (shipping location) COLD END HEADER ACCESS PANEL VARIABLE SPEED BLOWER MOTOR SHIPPING BLOCK SIGHT GLASS (-135 UNITS ONLY) INNER BLOWER ACCESS PANEL CONTROL BOX...
Page 4: Slp98Uhv Gas Furnace
Each SLP98UHV is shipped ready for installation in the difficult to smell. An LP/propane leak detector should be upflow, horizontal left air discharge or horizontal right air installed in all LP applications.
Page 5: Use Of Furnace As Cinstruction Heater
Canadian Electrical Code Part I (CSA Standard C22.1) changer failure. and/or local codes. This SLP98UHV furnace must be installed so that its elec- CAUTION trical components are protected from water. Installed in Combination with a Cooling Coil Do not set thermostat below 60F (16C) in heating mode.
Page 6: General
California to cause cancer, birth defects, or other reproductive harm. See figure 4. CAUTION SLP98UHV unit should not be installed in areas normally subject to freezing temperatures.. These instructions are intended as a general guide and do not supersede local codes in any way. Consult authorities having jurisdiction before installation.
Page 7 Plenum Transition FIGURE 6 Screw SLP98UHV applications which include side return air and a condensate trap installed on the same side of the cabinet (trap can be installed remotely within 5 Bottom Cap feet) require either a return air base or field-fabricated...
Page 8 Optional Return Air Base CONDENSATE (Upflow Applications Only) TRAP FURNACE FRONT 23 (584) 3−1/4 IF BASE Overall (83) IS USED (Maximum) Minimum WITHOUT 11 (279) IAQ CABINET, Maximum 22−7/16 INDOOR AIR A SINGLE Unit side return air 14 (356) (570) QUALITY RETURN AIR Opening...
Page 9 2. a platform, as shown in figure 13. A horizontal suspension Refer to Engineering Handbook for additional information. kit (51W10) may be ordered from Lennox or use equiva- Setting an Upflow Unit lent.
Page 10: Filters
Protect the condensate specifications provided by the filter manufacturer against discharge line from the pump to the outside to avoid the data given in the appropriate Lennox Product freezing. Specifications bulletin. Additional information is provided 6 - Continue with exhaust, condensate and intake in Service and Application Note ACC002 (August 2000).
Page 11: Duct System
Refer to table 2 for approved piping and fitting materials. vapors. Avoid contact of cement with skin and eyes. IMPORTANT SLP98UHV exhaust and intake connections are made of PVC. Use PVC primer and solvent cement when using PVC vent pipe. When using ABS vent pipe, use transitional solvent cement to make connections to the PVC fittings in the unit.
Page 12: Joint Cementing Procedure
Use PVC primer and solvent cement or ABS solvent cement meeting ASTM specifications, refer to Table 2. As an alternate, use all purpose cement, to bond ABS, PVC, or CPVC pipe when using fittings and pipe made of the same materials. Use transition solvent cement when bonding ABS to either PVC or CPVC.
Page 13: Venting Practices
1 - In areas where piping penetrates joists or interior Vent Pipe Guidelines walls, hole must be large enough`to allow clearance NOTE - Lennox has approved the use of DuraVent® and on all sides of pipe through center of hole using a Centrotherm manufactured vent pipe and terminations hanger.
Page 14 The SLP98UHV is installed only as a Direct Vent gas IMPORTANT central furnace. Do not use screens or perforated metal in exhaust or NOTE - In Direct Vent installations, combustion air is tak- intake terminations. Doing so will cause freeze-ups and en from outdoors and flue gases are discharged outdoors.
Page 15 TABLE 5 Maximum Allowable Intake or Exhaust Vent Length in Feet ust be same pipe size. *Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust m 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 - 7500’...
Page 16 TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN UPFLOW APPLICATIONS Intake Exhaust Intake Exhaust 2” 2” 2” 2” 2” 2” *2” *2” DO NOT transition from smaller to larger pipe size in horizontal runs of exhaust pipe. * When transitioning up in pipe size, use the shortest length of 2” PVC pipe possible. FIGURE 18 TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN HORIZONTAL AIR APPLICATIONS (RIGHT HAND DISCHARGE SHOWN)
Page 17: 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 20 Page 17...
Page 18 (19mm) Armaflex or equivalent may be necessary. Insu- doors. The SLP98UHV is classified as a direct vent, Cate- lation must be protected from deterioration. Armaflex with gory IV gas furnace.
Page 19 TABLE 6 Maximum Allowable Vent Pipe Length (in ft.) Without Insulation In Unconditioned Space For Winter Design Temperatures Modulating High Efficiency Furnace Winter Design Unit Input Size Vent Pipe Temperatures1 Diameter °F (°C) 2 in. 32 to 21 (0 to -6) 2-1/2 in 3 in.
Page 20 8” and EXHAUST PIPE TERMINATION SIZE REDUCTION a minimum distance of 6” with a termination elbow. SLP98UHV Model Termination Pipe Size See figure 29. *070 1-1/2”...
Page 21 7 - If intake and exhaust piping must be run up a side wall to position above snow accumulation or other obstructions, piping must be supported. At least one bracket must be used within 6” from the top of the 12”...
Page 22 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 23 SLP98 DIRECT VENT APPLICATION CONDENSATE TRAP AND PLUG LOCATIONS USING EXISTING CHIMNEY (Unit shown in upflow position) STRAIGHT-CUT OR ANGLE-CUT IN DIRECTION OF ROOF SLOPE * 3” - 8” (76mm- 8” - 12” 203mm) (203mm - 305mm) 1-1/2 in. Minimum 12” (305MM) SHOULDER OF FITTINGS INTAKE PIPE PROVIDE SUPPORT...
Page 24 HorizontalFurnace4” Min. to 5” Max.above trap and line. Heating cable kit is available from Lennox condensatedrain connection) in various lengths; 6 ft. (1.8m) - kit no. 26K68 and 24 ft.
Page 25 Furnace with Evaporator Coil Using a Separate Drain (Unit shown in horizontal left-hand discharge position) Field Provided Vent Evaporator (4” min. to 5” max. above Coil condensate connection) 4”min 5”max 5’ max. PVC Pipe Only Condensate Drain Connection (Trap at coil is optional) Drain Pan Piping from furnace and evaporator coil must slope down a minimum 1/4”...
Page 26 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 27: Gas Piping
IMPORTANT Gas Piping CAUTION Compounds used on threaded joints of gas piping must be resistant to the actions of liquified petroleum gases. 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 MANUAL MAIN SHUT-OFF FURNACE...
Page 28 Upflow Application Upflow Application Left Side Piping Right Side Piping 1/2” NPT (Standard) (Alternate) 1/2” NPT MANUAL MAIN SHUT-OFF VALVE MANUAL MAIN SHUT-OFF VALVE GROUND GROUND JOINT JOINT UNION UNION DRIP LEG FIELD PROVIDED AND INSTALLED DRIP LEG NOTE - BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET FIGURE 41 Horizontal Applications Possible Gas Piping Configurations...
Page 29 Removal of the Furnace from Common Vent 3 - Close all building doors and windows and all doors between the space in which the appliances In the event that an existing furnace is removed from a remaining connected to the common venting system venting system commonly run with separate gas applianc- are located and other spaces of the building.
Page 30: Electrical
MAKE-UP thermostat connections. NOTE - Do NOT make a wire connection between the room thermostat L terminal and the L terminal of the SLP98UHV integrated control unless this is a communicating thermostat installation with a non-communicating outdoor unit. Right Side...
Page 31 “C” terminal. See NOTE - When the SLP98UHV is used with icomfort Touch figure 47 for location of terminal. thermostat, proper indoor blower speed selections are made by the communicating thermostat.
Page 32 -ENABLED Outdoor Unit ® icomfort Wi-Fi Thermostat ® icomfort Wi-Fi Thermostat ® icomfort -Enabled SLP98UHV Indoor Furnace ® icomfort -Enabled SLP98UHV Indoor Furnace Non-Communicating Outdoor Air Conditioner ® icomfort -Enabled Outdoor Air Conditioner or Heat Pump ® icomfort ENABLED ®...
Page 33 NOTE: icomfort WiFi THERMOSTAT SENSES HUMIDITY & CONTROLS ENABLED 24V “H” OUTPUT (& 120V “H” OUTPUT) TO CYCLE HUMIDIFIER BASED SLP98UHV ON DEMAND. NO OTHER CONTROL OR HUMIDISTAT REQUIRED. FURNACE MIDIFIER (IF NOT ALREADY IN THE SYSTEM FOR OTHER ®...
Page 34 TABLE 12 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) Thermostat Wiring Connections DIP Switch 1 (O to R) Two-Stage cation or Heat Pumps Cooling Harmony 1Heat / 1 Cool...
Page 35 TABLE 12 Field Wiring Connections for Non-Communicating Thermostat Applications (Continued) DIP Switch Settings and On-Board Links (figure 47) W914 W915 (DS to R) (Y1 to Y2) W951 Thermostat Wiring Connections Two-Stage DIP Switch 1 (O to R) cation or Cooling Heat Pumps Harmony 2 Heat / 2 Cool...
Page 36 TABLE 12 Field Wiring Connections for Non-Communicating Thermostat Applications (Contiued) DIP Switch Settings and On-Board Links (figure 47) W914 W915 (DS to R) W951 (Y1 to Y2) Wiring Connections Thermostat DIP Switch (O to R) Two-Stage cation or Heat Pumps Cooling Harmony Dual Fuel...
Page 37 TYPICAL SLP98UHV WIRING DIAGRAM FIGURE 46 Page 37...
Page 38: Integrated Control
Integrated Control NEUTRAL TERMINALS COMBUSTION AIR INDUCER CONNECTOR IGNITOR FLAME CONNECTOR SENSE DIAGNOSTIC LINE VOLTAGE PUSH BUTTON TERMINALS DIP SWITCHES OUTDOOR AIR INDOOR SENSOR BLOWER TERMINALS 7-SEGMENT CONNECTOR DIAGNOSTIC LED W915 Y1 TO Y2 DISCHARGE AIR SENSOR W951 R TO O TERMINALS W914 R TO DS FACTORY TEST...
Page 39 10 minutes fixed Two-Stage Heat (W1 70%, W2 100%) Two-Stage NOTE - When the SLP98UHV is used with an icomfort and 5 on the integrated control. The unit is shipped from Touch communicating thermostat, all indoor blower speed the factory with a blower-off delay of 90 seconds. The...
Page 40 Switches 8 and 9 - Cooling Mode Blower Speed TABLE 18 The unit is shipped from the factory with the DIP switches Cooling Mode Blower Speed Ramping positioned for high speed (4) indoor blower motor opera- Ramping Option Switch 12 Switch 13 tion during the cooling mode.
Page 41 “CAL”. After calibration, the LED will return to the flashing “-” display. cations including SLP98UHV, a thermostat which features humidity control and a single-speed outdoor unit. Table 22 During Field Test mode operation, all safety switches are...
Page 42: Blower Data
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 iHarmony Zoning System Applications - Minimum blower speed is 250 cfm. ®...
Page 43 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 iHarmony Zoning System Applications - Minimum blower speed is 250 cfm. ®...
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 380 cfm. Lennox iHarmony Zoning System Applications - Minimum blower speed is 450 cfm. ®...
Page 45 TABLE 21 COOLING OPERATING SEQUENCE SLP98UHV and Single-Stage Outdoor Unit OPERATING SEQUENCE SYSTEM DEMAND SYSTEM RESPONSE Thermostat Demand Relative Humidity Blower System Step Compressor Comments Condition Status (cool) stage NO CALL FOR DEHUMIDIFICATION Compressor and indoor Normal Operation Acceptable High...
Page 46 TABLE 22 OPERATING SEQUENCE SLP98UHV and Two-Speed Outdoor Unit OPERATING SYSTEM DEMAND SYSTEM RESPONSE SEQUENCE Thermostat Demand Relative Humidity Blower System Step Compressor Comments 1 s t Condition Status (cool) stage stage NO CALL FOR DEHUMIDIFICATION Normal Operation Acceptable Compressor and indoor blower...
Page 47: Unit Start-Up
FOR YOUR SAFETY READ BEFORE OPERATING to the floor because some gas is heavier than air and will settle on the floor. The gas valve on the SLP98UHV is WARNING equipped with a gas control switch. Use only your hand to move the control switch.
Page 48: Turning Off Gas To Unit
Use pressure test 2 - Turn off all electrical power to the unit if service is to adapter kit (available as Lennox part 10L34) to assist in be performed. measurement.
Page 49 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 49...
Page 50: Proper Combustion
NOTE - A natural to LP/propane gas changeover kit (table 27) is necessary to convert this unit. Refer to the change- over kit installation instruction for the conversion procedure SLP98UHV units require no manifold pressure adjust- Proper Combustion ments for operation at altitudes up to 10,000 feet (3048 Furnace should operate a minimum of 15 minutes with m) above sea level.
Page 51: Heating Sequence Of Operation
Pressure Switches (Two) Electronic Ignition The pressure switches are located on the cold end header The integrated control has an added feature of an inter- box. These switches check for proper combustion air in- nal Watchguard control. The feature serves as an auto- ducer operation before allowing ignition trial.
Page 52 inducer speed is adjusted to the appropriate target 5 - If second-stage heat is required, the thermostat rate. The inducer will remain at the 70 percent second- stage heat contacts close and send a signal speed as long as the thermostat has a first-stage to the integrated control.
Page 53: Service
At the beginning of each heating season, and to comply 14 - Verify operation of CO detectors and replace with the Lennox Limited Warranty, your system should be batteries as required. checked as follows: Perform a general system test. Turn on the furnace to...
Page 54 2 - Verify that system total static pressure and airflow 5 - Mark and disconnect sensor wire from the sensor. settings are within specific operating parameters. Disconnect wires from flame rollout switches. 3 - Clock gas meter to ensure that the unit is operating 6 - Remove four screws which secure burner box at the specified firing rate for each stage of operation.
Page 55: Repair Parts List
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: SLP98UH070XV36B. All service must be performed by a licensed profession- al installer (or equivalent), service agency, or gas supplier.
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 Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E200 Hard lockout - Rollout circuit open or previously Correct unit cause of rollout trip or replace flame rollout switch and test furnace open. operation. E201 Indoor blower communication failure - Unable to Indoor blower communication failure including power outage.
Page 58 Integrated Control Diagnostic Codes Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E274 Soft lockout - Exceeded maximum number of See E 250. recycles. Last recycle failed due to the limit circuit opening or limit remained open longer than 3 minutes.
Page 59: Configuring Unit Size Codes
Integrated Control Diagnostic Codes Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover LSOM - Outdoor unit system pressure trip. Compressor ran over 18 hours in air conditioning mode. E402 E403 LSOM - Compressor short-cycling (Running less than Outdoor unit pressure trip.
Page 60: Troubleshooting: Heating Sequence Of Operation
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 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 63 Troubleshooting: Heating Sequence of Operation (continued) IGNITION AND CALL FOR HEAT WITH SINGLE-STAGE THERMOSTAT Safety Check Verify There Is No Main Burner Flame Indoor Blower OFF After 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 Revise NFPA-54 section 10.8.3 to add the following equipment shall not approve the installation unless, requirements: upon inspection, the inspector observes carbon For all side wall, horizontally vented, gas-fueled equip-...
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 Sas- katchewan Canada. 12” 2” (51MM) 3”...

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