Lennox SLP98UHV Installation Instructions Manual
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Lennox SLP98UHV Installation Instructions Manual

Lennox SLP98UHV Installation Instructions Manual

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E 2014 Lennox Industries Inc.
Dallas, Texas, USA
HORIZONTAL LEFT
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.
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03/14
*2P0314*
AIR FLOW
UPFLOW
HORIZONTAL RIGHT

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INSTALLATION
INSTRUCTIONS
SLP98UHV
DAVE LENNOX SIGNATURE
COLLECTION GAS FURNACE
UPFLOW / HORIZONTAL AIR DISCHARGE
507026-01
03/2014
Supersedes 01/2014
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
This a safety alert symbol and should never be ignored.
When you see this symbol on labels or in manuals, be alert
to the potential for personal injury or death.
As with any mechanical equipment, personal injury
can result from contact with sharp sheet metal
edges. Be careful when you handle this equipment.
A thermostat is not included and must be ordered
separately.
D The Lennox icomfort Wi-Fi
used in communicating applications.
D In non-communicating applications, the Lennox
ComfortSense
well as other non-communicating thermostats.
In all cases, setup is critical to ensure proper system
operation.
Field wiring for both communicating and non-com­
municating applications is illustrated in diagrams,
which begin on Page 32.
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CAUTION
NOTICE
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thermostat must be
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7000 thermostat may be used, as
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*P507026-01*
Litho U.S.A.
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Summary of Contents for Lennox SLP98UHV

  • Page 1: Table Of Contents

    D The Lennox icomfort Wi-Fi ® thermostat must be HORIZONTAL RIGHT HORIZONTAL LEFT 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) EXHAUST AIR 3−1/4 NOTE − 60C and 60D size units that require second stage OUTLET (83) air volumes over 1800 cfm (850 L/s) must have one of the following: 1−7/8 (48) 1. Single side return air with transition, to accommodate 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: Gas Furnace

    SLP98UHV Gas Furnace DANGER The SLP98UHV category IV gas furnace is equipped with a Danger of explosion. variable-capacity, variable-speed integrated control. This There are circumstances in which odorant used with control ensures compatibility with the Lennox icomfort Wi- ® LP/propane gas can lose its scent. In case of a leak,...

  • Page 5: Use Of Furnace As A Construction Heater

    This SLP98UHV furnace must be installed so that its elec­ CAUTION trical components are protected from water. Do not set thermostat below 60°F (16°C) in heating Installed in Combination with a Cooling Coil mode.

  • Page 6: General

    Upflow Applications • When the furnace is installed in an unconditioned The SLP98UHV gas furnace can be installed as shipped in space, consider provisions required to prevent freezing the upflow position. Refer to figure 10 for clearances.

  • Page 7: Setting Equipment

    Transition Screw FIGURE 6 Bottom Cap SLP98UHV applications which include side return air and a condensate trap installed on the same side of the Bottom Panel cabinet (trap can be installed remotely within 5 feet) re­ quire either a return air base or field-fabricated transi­...
  • 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 INDOOR AIR 22−7/16 A SINGLE Unit side return air 14 (356) (570) QUALITY RETURN AIR Opening...
  • Page 9 Horizontal Applications supported separately. The SLP98UHV furnace can be installed in horizontal ap­ NOTE - When the furnace is installed on a platform in a plications with either right- or left-hand air discharge.

  • Page 10: Filters

    6 - Continue with exhaust, condensate and intake piping against the data given in the appropriate Lennox Product Specifications bulletin. Additional informa­ installation according to instructions. tion is provided in Service and Application Note ACC­00­2 (August 2000).

  • Page 11: Duct System

    The solvent shall be free-flowing and contain no lumps, undissolved particles or any foreign matter that ad­ SLP98UHV exhaust and intake connections are versely affects the joint strength or chemical resistance of made of PVC. Use PVC primer and solvent cement the cement.

  • Page 12: Joint Cementing Procedure

    Use PVC primer and solvent cement or ABS solvent ce­ Low temperature solvent cement is recommended. Metal ment meeting ASTM specifications, refer to Table 2. As an or plastic strapping may be used for vent pipe hangers. alternate, use all purpose cement, to bond ABS, PVC, or Uniformly apply a liberal coat of PVC primer for PVC CPVC pipe when using fittings and pipe made of the same materials.

  • Page 13: Venting Practices

    NOTE - Time is critical at this stage. Do not allow prim­ er to dry before applying cement. The SLP98UHV furnace may be installed only in direct 7 - Immediately after applying last coat of cement to pipe, vent applications.
  • Page 14 6. Piping Size Process The SLP98UHV is installed only as a Direct Vent gas central furnace. NOTE - In Direct Vent installations, combustion air is taken What is the from outdoors and flue gases are discharged outdoors.
  • Page 15 TABLE 5 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 - 7500' 2”...
  • 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 Armaflex with doors. The SLP98UHV is classified as a direct vent, Cate­ UV protection is permissable. Basements or other en­ 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 Unit Input Size Winter Design Vent Pipe Temperatures °F (°C) Diameter 2 in. 32 to 21 (0 to -6) 2-1/2 in.
  • Page 20 TABLE 7 intake pipe without a termination elbow is 8” and a EXHAUST PIPE TERMINATION SIZE REDUCTION minimum distance of 6” with a termination elbow. See SLP98UHV Termination Pipe Size MODEL 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 ob­ structions, piping must be supported. At least one 12” EXHAUST (305mm) bracket must be used within 6” from the top of the el­ VENT 5-1/2”...
  • 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 CONDENSATE TRAP AND PLUG LOCATIONS SLP98 DIRECT VENT APPLICATION (Unit shown in upflow position) USING EXISTING CHIMNEY 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 If this is not possible, a heat cable kit may be used on the condensate trap and line. Heating cable kit is available from Lennox in various lengths; 6 ft. (1.8m) - kit no. 26K68; 24 ft. (7.3m) - kit no. 26K69; and 50 ft.
  • Page 25 SLP98UHV 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

    Gas Piping IMPORTANT CAUTION Compounds used on threaded joints of gas piping must be resistant to the actions of liquified petro­ leum 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 cabinet.
  • 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 be­ tween the space in which the appliances remaining In the event that an existing furnace is removed from a connected to the common venting system are located venting system commonly run with separate gas ap­...

  • Page 30: Electrical

    MAKE-UP 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 º º rating 95 F (35 C) mini­ 2 - When the SLP98UHV is running in the heating mode, mum, solid core. (Class II More than 100' (30m) Rated Wiring) the integrated control will automatically adjust the blower speed to match the furnace firing rate. This TABLE 11 speed can be adjusted up or down by 7.5% or 15% us­...
  • Page 32 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 OPTIONAL OUTDOOR AIR SENSOR FOR USE WITH HU­ 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) Dehumidifi­ Thermostat Wiring Connections DIP Switch 1 (O to R) Two-Stage cation or Heat Pumps Cooling Harmony IIIt...
  • Page 35 TABLE 12 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 36 * 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 SLP98UHV integrated control. Page 36...
  • Page 37 TYPICAL SLP98UHV WIRING DIAGRAM FIGURE 46 Page 37...

  • Page 38: Integrated Control

    Integrated Control NEUTRAL TERMINALS COMBUSTION AIR INDUCER CONNECTOR IGNITOR CONNECTOR FLAME 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 the Toucht communicating thermostat, all indoor blower factory with a blower-off delay of 90 seconds. The blower- speed selections and DIP switch settings are made by the off delay affects comfort and is adjustable to satisfy individ­...
  • Page 40 Switches 8 and 9 -- Cooling Mode Blower Speed -- The TABLE 18 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 41 Refer to table 21 for operation sequence in ap­ form the high-fire and low-fire pressure switch calibra­ plications including SLP98UHV, a thermostat which fea­ tions and display “CAL”. After calibration, the LED will tures humidity control and a single-speed outdoor unit.

  • Page 42: 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 42...
  • 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 380 cfm. Lennox Harmony III™ Zoning System Applications - Minimum blower speed is 380 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 TABLE 21 COOLING OPERATING SEQUENCE SLP98UHV 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 46 TABLE 22 COOLING OPERATING SEQUENCE SLP98UHV 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 47: Unit Start Up

    WARNING The gas valve on the SLP98UHV 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 48: Gas Pressure Measurement

    Use pressure test 3 - Remove the access panel. adapter kit (available as Lennox part 10L34) to assist in measurement. 4 - Move the gas valve switch to the OFF position. 1 - Remove the threaded plug from the outlet side of the 5 - Replace the access panel.
  • Page 49 MANIFOLD PRESSURE MEASUREMENT Gas Valve Field Installed FIGURE 49 Negative Port Operating Signal (Delta P) Measurement Positive Port Red Tubing - Black Tubing + Gas Valve Field Installed Measuring Device FIGURE 50 Page 49...

  • Page 50: High Altitude Information

    NOTE - A natural to LP/propane gas changeover kit (table 27) is necessary to convert this unit. Refer to the changeover 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 m) Furnace should operate a minimum of 15 minutes with cor­...

  • Page 51: Heating Sequence Of Operation

    Pressure Switches (Two) Electronic Ignition The integrated control has an added feature of an internal The pressure switches are located on the cold end header Watchguard control. The feature serves as an automatic box. These switches check for proper combustion air in­ reset device for ignition control lockout caused by ignition ducer operation before allowing ignition trial.
  • Page 52 ignition stabilization delay expires, the inducer speed 5 - If second-stage heat is required, the thermostat sec­ is adjusted to the appropriate target rate. The inducer ond-stage heat contacts close and send a signal to the will remain at the 70 percent speed as long as the ther­ integrated control.

  • Page 53: Service

    Filters 14 - Follow lighting instructions to light and operate fur­ All SLP98UHV filters are installed external to the unit. Fil­ nace for 5 minutes to ensure that heat exchanger is ters should be inspected monthly. Clean or replace the fil­...

  • Page 54: 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 profes­ sional installer (or equivalent), service agency, or gas supplier.

  • Page 55: 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 56 Integrated Control Diagnostic Codes (continued) Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover Low pressure switch failed open - Refer to troubleshooting in installation instruc­ Check inches of water column pressure during operation E 223 tion. of low pressure switch on heat call, measure inches of water column of operating pressure, inspect vent and com­...
  • Page 57 Integrated Control Diagnostic Codes (continued) Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover Indoor blower motor temperature is too high. Indoor blower motor over temperature (motor E 295 tripped on internal protector), Check motor bear­ ings, amperes. Replace if necessary. E 310 Discharge error sensor failure - No error if disconnected.

  • Page 58: Configuring Unit Size Codes

    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: Furnace control in IDLE mode No heating, cooling or indoor fan operation)

  • Page 59: 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 Switch Inducer On...
  • Page 60 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 61 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 62 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 63: Troubleshooting: Cooling Sequence Of Operation

    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 64 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 65 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 66 FOR THE PROVINCE OF ONTARIO, HORIZONTAL SIDEWALL VENT APPLICATIONS ONLY For exterior horizontal venting applications, the 2” X 1.5” plume is unobjectionable. If the installation requires more reducer for 2” venting at the point where the exhaust pipe separation between the flue gases and the building struc­ exits the structure is not required in direct or non­direct vent ture, a reducer may be installed on the exhaust pipe to in­...

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