Lennox SIGNATURE SLP99DFV Installation Instructions Manual
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Lennox SIGNATURE SLP99DFV Installation Instructions Manual

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2021 Lennox Industries Inc.
©
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 - inches (mm) ......................................2
Parts Arrangement..........................................................3
SLP99DFV Gas Furnace ................................................4
Shipping and Packing List ..............................................4
Safety Information ..........................................................4
Building Codes ...............................................................4
Use of Furnace as Construction Heater .........................5
General ...........................................................................6
Installation - Setting Equipment ......................................6
Filters ..............................................................................9
Duct System ...................................................................9
Pipe & Fittings Specifications ....................................... 11
Venting Options ............................................................13
Joint Cementing Procedure ..........................................14
Venting Pracitces ..........................................................15
INSTALLATION
INSTRUCTIONS
SLP99DFV
DAVE LENNOX SIGNATURE
COLLECTION GAS FURNACES
DOWNFLOW AIR DISCHARGE
508001-02
10/2021
Supersedes 08/2021
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.
• A communicating thermostat must be used 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 35.
Gas Piping ....................................................................30
Electrical .......................................................................33
Integrated Control .........................................................41
Blower Data ..................................................................45
Unit Start-Up .................................................................50
Turning Off Gas to Unit .................................................51
High Altitude Information ..............................................51
Gas Pressure Measurement.........................................51
Proper Combustion.......................................................51
Heating Sequence of Operation ...................................54
Service..........................................................................56
Repair Parts..................................................................57
Integrated Control Diagnostic Codes............................58
Configuring Unit Size Codes ........................................61
Page 1
®
CAUTION
NOTICE
both
communicating
and
non-

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Summary of Contents for Lennox SIGNATURE SLP99DFV

  • Page 1: Table Of Contents

    NOTICE A thermostat is not included and must be ordered separately. • A communicating 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 - Inches (Mm)

    Unit Dimensions - inches (mm) 9/16 (14) COMBUSTION Flue Condensate Trap Assembly AIR INTAKE Furnished for external RETURN AIR field installation (178) OPENING EXHAUST AIR on either side of unit. OUTLET (See installation instructions for additional information.) 2-1/16 (52) 9/16 2-1/4 (14) (57)

  • 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: Slp99Dfv Gas Furnace

    SLP99DFV Gas Furnace Safety Information The SLP99DFV category IV gas furnace is equipped with WARNING a variable-capacity, variable-speed integrated control. This control ensures compatibility with the Lennox com- Improper installation, adjustment, alteration, service mincating thermostat and iHarmony zone control system, ®...

  • Page 5: Use Of Furnace As Construction Heater

    FAILURE TO FOLLOW THE ABOVE INSTALLATION IN- STRUCTIONS VOIDS THE MANUFACTURER’S EQUIP- CAUTION MENT LIMITED WARRANTY. LENNOX DISCLAIMS ALL LIABILITY IN CONNECTION WITH INSTALLER’S Do not set thermostat below 60F (16C) in heating mode. FAILURE TO FOLLOW THE ABOVE INSTALLATION IN- Setting below 60F (16C) reduces the number of heating STRUCTIONS.

  • Page 6: General

    NOTWITHSTANDING THE FOREGOING, INSTALLER Installation - Setting Equipment IS RESPONSIBLE FOR CONFIRMING THAT THE USE OF CONSTRUCTION HEAT IS CONSISTENT WITH THE WARNING POLICIES AND CODES OF ALL REGULATING ENTI- TIES. ALL SUCH POLICIES AND CODES MUST BE AD- Do not install the furnace on its front, back or in the HERED TO.
  • Page 7 NOTE - The 1/2 hp blower motor used in the SLP99D- IThe unit may be installed three ways in downflow applica- tions: on non-combustible flooring, on combustible floor- F070V36B and SLP99DF090V36C unit is equipped with three flexible legs and one rigid leg. The rigid leg ing using a base, or on a reverse-flow cooling coil cabinet.
  • Page 8 TABLE 1 NON-COMBUSTIBLE FLOOR OPENINGSIZE FURNACE Front to Rear Side to Side Cabinet Width B Cabinet 17 - 1/2” 19 - 3/4 16 - 5/8 SUPPLY AIR PLENUM C Cabinet 21” 19 - 3/4 20 - 1/8 NOTE - Floor opening dimensions listed are 1/4 inch (6 mm) larger than PROPERLY COMBUSTIBLE SIZED FLOOR...

  • Page 9: Filters

    Before using any filter with this system, check the the furnace control board is not required. specifications provided by the filter manufacturer against the data given in the appropriate Lennox Product Specifications bulletin. Additional information is provided in Service and Application Note ACC002 (August 2000).
  • Page 10 TABLE 4 Discharge Air Temperature Sensor Location Downflow SLP99DF Model “a” “b” Mounting Surface 070XV36B 090XV36C 090XV48C 6” Center Plenum Duct 090XV60C 110XV60C Discharge Air Sensor Location and Wiring AIR FLOW DISCHARGE AIR Coil SENSOR TERMINALS Plenum W915 W951 W914 Downflow FIGURE 14 Page 10...

  • Page 11: Pipe & Fittings Specifications

    NOTE - Operation of this furnace in heating mode (indoor TABLE 5 blower operating at selected heating speed) with an ex- PIPING AND FITTINGS SPECIFICATIONS ternal static pressure which exceeds 0.8 inches w.c. may Schedule 40 PVC (Pipe) D1785 result in erratic limit operation. Schedule 40 PVC (Cellular Core Pipe) F891 Return Air Plenum...
  • Page 12 TABLE 6 OUTDOOR TERMINATION USAGE* STANDARD CONCENTRIC Wall Kit 1-1.2 inch 2 inch 3 inch Flush Mount Vent Pipe 2 inch 3 inch Input Size Field 71M80 (US) 69M29 (US) 60L46 (US) Dia. in. 51W11 (US) Fabricated 44W92 44W92 44W93 22G44 (US) 44J40 (US) 51W12...

  • Page 13: Venting Options

    IMPORTANT Venting Options The SLP99DF is shipped with vent exhaust / air intake Side vent sealing plates and side vent sealing gaskets connection at the top cap. See FIGURE 15. Using parts must be used when converting to right side venting. provided, the furnace may be field modified to have these Failure to use gaskets and plates may lead to improper connections on the right side of the furnace cabinet.

  • Page 14: Joint Cementing Procedure

    Right Side Vent Configuration Side Vent Sealing Plate Side Vent Sealing Gaskets Exhaust Intake Street Elbows (2) FIGURE 17 6 - Promptly apply solvent cement to end of pipe and Joint Cementing Procedure inside socket surface of fitting. Cement should be All cementing of joints should be done according to these applied lightly but uniformly to inside of socket.

  • Page 15: Venting Pracitces

    VENT (Check sizing space. for water heater only) Vent piping Guidliens NOTE - Lennox has approved the use of DuraVent® and WATER Centrotherm manufactured vent pipe and terminations HEATER FURNACE (Replaced) as an option to PVC. When using the PolyPro® by Du- raVent or InnoFlue®...
  • Page 16 Use the following steps to correctly size vent pipe diam- FIGURE 20 eter. NOTE - Lennox offers a glueless vent adapter kit 17H92 IMPORTANT as an option for exhaust exiting at the furnace top cap coupling. Do not use screens or perforated metal in exhaust or intake terminations.
  • Page 17 TABLE 8 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’...
  • Page 18 TABLE 8 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 1-1/2”...
  • Page 19 TYPICAL PIPE CONNECTIONS 070 Only 2” 1−1/2” 2” 2” 2” TRANSITION 2” 2” Exhaust Exhaust 3” DO NOT transition from larger to smaller pipe in horizontal runs TRANSITION of exhaust pipe. INTAKE EXHAUST DO NOT transition from smaller *2” to larger pipe size in horizontal TOP VIEW runs of exhaust pipe.
  • Page 20 TYPICAL EXHAUST CONNECTIONS WITH RIGHT SIDE VENT OPTION Pipe Length 4” Maximum (Not Furnished) 3” 2” 2” TRANSITION *2” 2” Plate (Furnished) Street Ell (Not Furnished) TOP VIEW * 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 21 ‡ 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 25 Page 21...
  • Page 22 In Direct Vent applications, the vent termination is limited by local building codes. In the absence of local codes, re- Lennox provides kit 51W18 (USA) and kit 15Z70 (Cana- fer to the current National Fuel Gas Code ANSI Z223-1/ da)to install 2” or 3” PVC exhaust piping through the floor NFPA 54 in U.S.A., and current CSA-B149 Natural Gas...
  • Page 23 TABLE 9 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) 1-1/2 in. 32 to 21 2 in. (0 to -6) 2-1/2 in 3 in.
  • Page 24 Details of Intake and Exhaust Piping Terminations for 6 - On field-supplied terminations, a minimum distance Direct Vent Installations between the end of the exhaust pipe and the end of the intake pipe without a termination elbow is 8” and NOTE - In Direct Vent installations, combustion air is taken a minimum distance of 6”...
  • Page 25 7 - If intake and exhaust piping must be run up a 2” EXTENSION FOR 2” PVC side wall to position above snow accumulation or PIPE1” EXTENSION FOR 3” other obstructions, piping must be supported. At PVC PIPE least one bracket must be used within 6” from the FURNACE EXHAUST top of the elbow and then every 24”...
  • Page 26 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 27 Condensate Piping 4 - FIGURE 40 shows the furnace and evaporator coil using a separate drain. If necessary, the condensate This unit is designed for either right- or left-side exit of line from the furnace and evaporator coil can condensate piping. Refer to FIGURE 37 and FIGURE 38 drain together.
  • Page 28 Coil Using a Common Drain and line. Heat cable kit is available from Lennox in various lengths; 6 ft. (1.8m) - kit no. 26K68 and 24 ft. (7.3m) - kit no.
  • Page 29 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 30: Gas Piping

    IMPORTANT Gas Piping CAUTION Compounds used on threaded joints of gas piping must be resistant to the actions of liquified If a flexible gas connector is required or allowed petroleum gases. by the authority that has jurisdiction, black iron pipe shall be installed at the gas valve and extend MANUAL MAIN SHUT-OFF outside the furnace cabinet.
  • Page 31 Left Side Piping AUTOMATIC MANUAL (Standard) GAS VALVE MAIN SHUT-OFF MANUAL (with manual VALVE AUTOMATIC MAIN SHUT-OFF shut-off valve) (1/8 in. NPT GAS VALVE VALVE plugged tap (with manual (1/8 in. NPT shown) shut-off valve) plugged tap shown) GROUND JOINT UNION GROUND JOINT...
  • Page 32 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 33: Electrical

    The unit is equipped with a make-up box on the left hand Electrical side of the cabinet. A field-provided make-up box can be installed on the exterior of the right side of the furnace to ELECTROSTATIC DISCHARGE (ESD) facilitate installation. If the make-up box is moved to the Precautions and Procedures right side, clip the wire ties that bundle the wires together CAUTION...
  • Page 34 For optimal performance in non-communicating applica- provided on the furnace integrated control. Any tions, Lennox recommends use of a ComfortSense® 7500 humidifier rated up to one amp can be connected to this terminal with the neutral leg of the circuit being high quality electronic digital thermostat or any other with connected to one of the provided neutral terminals.
  • Page 35 Communicating Enabled Furnace and Communicating Enabled Furnace and Non-Communicating Outdoor Unit Communicating Enabled Outdoor Unit COMMUNICATING ENABLED FURNACE COMMUNICATING ENABLED FURNACE OPTIONAL DISCHARGE AIR SENSOR OPTIONAL DISCHARGE AIR SENSOR OPTIONAL OUTDOOR OPTIONAL COMMUNICATING AIR SENSOR OUTDOOR THERMOSTAT AIR SENSOR COMMUNICATING THERMOSTAT COMMUNICATING ENABLED OUTDOOR UNIT...
  • Page 36 THERMOSTAT NOTE: 24V UV LIGHT APPLICATIONS plications. An additional transformer for UV light applications is required. COMMUNICATING LENNOX COMMUNICATING FURNACE HEPA BYPASS FILTER ENABLED FURNACE EL296V, SL280V, SL280VN, SL297V, SLP99V X2680 HEPA cutting DS to R will not cause INTERLOCK KIT...
  • Page 37 TABLE 15 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 38 TABLE 14 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 39 TABLE 14 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 40 FIGURE 49 Page 40...

  • Page 41: 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 42 TABLE 16 Non-Communicating Thermostat Selection Switch Settings Operation Thermostat Switch 1 Switch 2 Switch 3 Variable Capacity Heat (35% to 100%) Two-Stage 2nd stage delay OFF = 7 minutes Three-Stage Heat Single-Stage ON = 12 minutes 3rd stage delay (35%, 70%, 100%) 10 minutes fixed Two-Stage Heat (W1 70%, W2 100%) Two-Stage...
  • Page 43 Switches 8 and 9 -- Cooling Mode Blower Speed -- The TABLE 21 unit is shipped from the factory with the DIP switches po- Cooling Mode Blower Speed Ramping sitioned for high speed (4) indoor blower motor operation Ramping Option Switch 12 Switch 13 during the cooling mode.
  • Page 44 Switches 14 through 19 -- Heating Mode Blower Speed On-Board Link W915 (Y1 to Y2) -- FIGURE 50 -- These switches are factory set at the OFF position On-board link W915 is a clippable connection between which provides 100 % of normal speed during HIGH HEAT terminals Y1 and Y2 on the integrated control.

  • Page 45: 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%, and 38%, (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 46 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% and 38% (DIP switch selectable) of the same second-stage COOL speed position minimum 250 cfm. Lennox iHarmony Zoning System Applications - Minimum blower speed is 380 cfm.
  • Page 47 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% and 38% (DIP switch selectable) of the same second-stage COOL speed position minimum 250 cfm. Lennox iHarmony Zoning System Applications - Minimum blower speed is 450 cfm.
  • Page 48 TABLE 26 COOLING OPERATING SEQUENCE SLP99DFV 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 100% blower follow thermostat demand...
  • Page 49 TABLE 27 OPERATING SEQUENCE SLP99DFV 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 follow thermostat demand Normal Operation Acceptable...

  • Page 50: Unit Start-Up

    BEFORE BEFORE PLACING THE UNIT INTO OPERA- Unit Start-Up TION, smell all around the furnace area for gas. Be sure FOR YOUR SAFETY READ BEFORE OPERATING to smell next to the floor because some gas is heavier than air and will settle on the floor. The gas valve on the WARNING SLP99DFV is equipped with a gas control switch.

  • Page 51: Turning Off Gas To Unit

    9 - Replace the access panel. Gas Pressure Measurement 10 - Turn on all electrical power to to the unit. Gas Flow (Approximate) 11 - Set the thermostat to desired setting. TABLE 28 NOTE - When unit is initially started, steps 1 through 11 may need to be repeated to purge air from gas line.
  • Page 52 Operating pressure signal can be taken while the manifold ative burner box must be considered. Use pressure test pressure pressure check is taken (using two measuring adapter kit (available as Lennox part 10L34) to assist in devices). Or, taken after the manifold pressure measure- measurement.
  • Page 53 MANIFOLD PRESSURE MEASUREMENT Gas Valve Field Installed FIGURE 52 Negative Port Operating Signal (Delta P) Measurement Positive Port Red and Black Tubing - Black Tubing + Gas Valve Field Installed Measuring Device FIGURE 53 Page 53...

  • Page 54: Heating Sequence Of Operation

    Temperature Rise Other Unit Adjustments After the furnace has been started and supply and return Primary Limit air temperatures have been allowed to stabilize, check the temperature rise with the unit operating at 100 percent fir- The primary limit is located on the heating compartment ing rate.
  • Page 55 2 - Once the control receives a signal that the low- 4 - After the 20-second warm-up period has ended, fire pressure switch has closed, the combustion the gas valve is energized and ignition occurs.At air inducer begins a 15-second pre-purge in the the same time, the control module begins an indoor ignition speed.

  • Page 56: Service

    Annual Furnace Maintenance At the beginning of each heating season, and to compl ith the Lennox Limited Warranty, your system should be checked as follows: Page 56...

  • Page 57: Repair Parts

    15 - Replace heating compartment access panel. Repair Parts The following repair parts are available through Lennox dealers. When ordering parts, include the complete furnace model number listed on the nameplate -- Example: SLP99DF070V36B. All service must be performed by a licensed profes- sional installer (or equivalent), service agency, or gas supplier.

  • Page 58: 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 59 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 60 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 61: Configuring Unit Size Codes

    Integrated Control Diagnostic Codes Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E402 LSOM - Outdoor unit system pressure trip. Compressor ran over 18 hours in air conditioning mode. LSOM - Compressor short-cycling (Running less than Outdoor unit pressure trip. Check dirty coil, fan motor, E403 4 minutes).

  • Page 62: 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 63 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 64 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 65 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 66 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 67 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 68 Requirements for Commonwealth of Massachusetts 4 - INSPECTION. The state or local gas inspector of the Modifications to NFPA-54, Chapter 10 side wall, horizontally vented, gas-fueled equipment shall not approve the installation unless, upon Revise NFPA-54 section 10.8.3 to add the following inspection, the inspector observes carbon monoxide requirements: detectors and signage installed in accordance with the...
  • Page 69 ADDENDUM FOR ALL PROVINCES OF CANADA See below for venting for all provinces of Canada. Lennox approves the following termination for use in all provices of Canada. 12”...
  • Page 70 UNIT SET UP (typical) Furnace: Model Number_______________ Serial Number_________________ SUPPLY Line Voltage GAS SUPPLY LP Propane Gas Natural Gas Piping Connections Tight Leak Tested Flter Supply Line Pressure “W.C.________ RETURN AIR Gas Supply Pressure DUCT SYSTEM SUPPLY AIR DUCT Sealed INTAKE / EXHAUST PIPE Insulated (if necessary) All Joints Primed and Glued...
  • Page 71 UNIT OPERATION HEATING MODE COOLING MODE GAS MANIFOLD PRESSURE “W.C._____ INDOOR BLOWER AMPS______ COMBUSTION SAMPLE CO CO PPM_______ TEMPERATURE DROP ______ Return Duct Temperature _________ INDOOR BLOWER AMPS______ Supply Duct Temperature _______ Temperature Drop = _________ TEMPERATURE RISE TOTAL EXTERNAL STATIC (dry coil) Supply Duct Temperature ________ Supply External Static _______ Return Duct Temperature...

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