Lennox SIGNATURE SLP99UHV Installation Instructions Manual
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Lennox SIGNATURE SLP99UHV 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 .............................................................2
Parts Arrangement..........................................................3
SLP99UHV Gas Furnace ...............................................4
Shipping and Packing List ..............................................4
Safety Information ..........................................................4
Use of Furnace as Construction Heater .........................5
General ...........................................................................6
Installation - Setting Equipment ......................................6
Filters ............................................................................10
Duct System .................................................................10
Pipe Fittings Specifications...........................................13
Joint Cementing Procedure ..........................................14
Venting Practices ..........................................................15
Vent Pipe Guidelines ....................................................15
INSTALLATION
INSTRUCTIONS
SLP99UHV
DAVE LENNOX SIGNATURE
COLLECTION GAS FURNACES
UP/FLOW HORIZONTAL AIR DISCHARGE
507999-01
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
Unit Start-Up .................................................................50
Gas Pressure Measurement ........................................51
Proper Combustion.......................................................53
High Altitude Information ..............................................53
Other Unit Adjustments.................................................53
Heating Sequence of Operation ...................................54
Service..........................................................................56
Repair Parts List ...........................................................58
Integrated Control Diagnostic Codes............................59
Configuring Unit Size Codes ........................................62
Page 1
®
CAUTION
NOTICE
both
communicating
and
non-

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Summary of Contents for Lennox SIGNATURE SLP99UHV

  • 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

    Unit Dimensions - inches (mm) NOTE - 60C and 60D size units that require air volumes over EXHAUST AIR 3-1/4 1800 cfm must have one of the following: OUTLET (83) 1. Single side return air and Optional Return Air Base with transition that must accommodate required 1-7/8 (48) 20 x 25 x 1 inch (508 x 635 x 25 mm) air filter to...

  • 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: Slp99Uhv Gas Furnace

    DANGER SLP99UHV Gas Furnace The SLP99UHV category IV gas furnace is equipped with Danger of explosion. a variable-capacity, variable-speed integrated control. There are circumstances in which odorant used with LP/ This control ensures compatibility with a communicating propane gas can lose its scent. In case of a leak, LP/ thermostat, the iHarmony zone control system, or a ther- ®...

  • Page 5: Use Of Furnace As Construction Heater

    in a public garage, hangar, or other building that has a NOTE - This furnace is designed for a minimum continu- hazardous atmosphere, the furnace must be installed ac- ous return air temperature of 60°F (16°C) or an intermittent cording to recommended good practice requirements and operation down to 55°F (13°C) dry bulb for cases where a current National Fuel Gas Code or CSA B149 standard.

  • Page 6: General

    FAILURE TO FOLLOW THE ABOVE INSTALLATION IN- WARNING STRUCTIONS VOIDS THE MANUFACTURER’S EQUIP- MENT LIMITED WARRANTY. LENNOX DISCLAIMS Do not install the furnace on its front or back. ALL LIABILITY IN CONNECTION WITH INSTALLER’S See FIGURE 4.
  • Page 7 SETTING EQUIPMENT UPFLOW APPLICATION Place level on blower Place level on the front blower deck screws to check deck to check side to side forward tilt UNIT FRONT AIR FLOW 1/2” max. SIDE VIEW HORIZONTAL APPLICATION UNIT FRONT AIR FLOW 1/2”...
  • 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. on a platform, as shown in FIGURE 13. A horizontal sus- Refer to Engineering Handbook for additional information. pension kit (51W10) may be ordered from Lennox or use Setting an Upflow Unit equivalent.

  • Page 10: Filters

    1 - Select location for unit keeping in mind service and specifications provided by the filter manufacturer against other necessary clearances. See FIGURE 11. the data given in the appropriate Lennox Product 2 - Construct a raised wooden frame and cover frame Specifications bulletin. Additional information is provided with a plywood sheet.
  • Page 11 Discharge Air Temperature Sensor This furnace is shipped with a discharge air temperature sensor that can be installed in the supply air plenum. The sen- sor is used to measure temperature rise in the heating mode and temperature drop in the cooling mode. See TABLE 2 and FIGURE 15 (upflow) or TABLE 3 and FIGURE 16 (horizontal left) or TABLE 4 and FIGURE 17 (horizontal right) for correct location.
  • Page 12 TABLE 3 TABLE 4 Discharge Air Temperature Sensor Discharge Air Temperature Sensor Location Horizontal Left Location Horizontal Right SLP99UH Mounting SLP99UH Mounting “a” “b” “a” “b” Model Surface Model Surface 070XV36B 5” Center 070XV36B 5” Center 090XV36C 3” 4” from bottom 090XV36C 2”...

  • Page 13: 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 Supply Air Plenum...

  • Page 14: Joint Cementing Procedure

    Use PVC primer and solvent cement or ABS solvent cement meeting ASTM specifications, refer to TABLE 5. As an alter- nate, 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 15: Venting Practices

    Vent Pipe Guidelines hanger. NOTE - Lennox has approved the use of DuraVent® and 2 - When furnace is installed in a residence where unit Centrotherm vent pipe and terminations as an option to is shut down for an extended period of time, such PVC.
  • Page 16 090, 110 of 2”, 2-1/2” or 3” diameter pipe NOTE - Lennox offers a glueless vent adapter kit 17H92 as an option for exhaust exiting at the furnace top cap 5 ft. plus 2 elbows of 3” diameter pipe coupling.
  • Page 17 TABLE 8 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 18 TABLE 8 Cont. 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 Concentric Termination 0 - 7501”...
  • Page 19 TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN UPFLOW 2” EXHAUST 2” EXHAUST INTAKE INTAKE 2” 2” 2” 2” 3” 3” 070 Only 1−1/2” TRANSITION Exhaust 2” 6” Min Exhaust DO NOT transition from larger to smaller DO NOT transition pipe in horizontal runs from smaller to larger Exhaust of exhaust pipe.
  • Page 20 ‡ 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 20...
  • Page 21 Crawl Space and Extended Horizontal Venting condensate can damage the painted coating. Lennox provides kit 51W18(USA) and kit 15Z70 (Canada) NOTE - See TABLE 9 for maximum allowed exhaust pipe to install 2” or 3” PVC exhaust piping through the floor length without insulation in unconditioned space during- joists and into the the crawl space.
  • Page 22 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 23 Details of Intake and Exhaust Piping Terminations for 3”(76mm) MAX. Direct Vent Installations Inches(mm) SIZE TERMINATION PIPE PER TABLE 7. NOTE - In Direct Vent installations, combustion air is taken UNCONDITIONED from outdoors and flue gases are discharged to outdoors. ATTIC SPACE 8”...
  • Page 24 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 12” EXHAUST (305mm) VENT top of the elbow and then every 24”...
  • 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 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 27 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 28 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 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 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 31 Upflow Application Upflow Application Left Side Piping Right Side Piping (Standard) (Alternate) 1/2” NPT 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 49 Horizontal Applications Possible Gas Piping Configurations...
  • 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 field make-up box on the left Electrical hand side of the cabinet. The make-up box may be moved ELECTROSTATIC DISCHARGE (ESD) to the right side of the furnace to facilitate installation. If Precautions and Procedures the make-up box is moved to the right side, clip the wire ties that bundle the wires together.
  • Page 34 For optimal performance in non-communicating applica- 8 - One line voltage “HUM” 1/4” spade terminal is tions, Lennox recommends use of a ComfortSense® 7500 provided on the furnace integrated control. Any high quality electronic digital thermostat or any other with...
  • 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 COMMUNICATING THERMOSTAT NOTE: 24V UV LIGHT APPLICATIONS plications. An additional transformer for UV light applications is required. LENNOX COMMUNICATING FURNACE COMMUNICATING HEPA BYPASS FILTER EL296V, SL280V, SL280VN, SL297V, SLP99V ENABLED FURNACE X2680 HEPA cutting DS to R will not cause...
  • 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 15 Cont. 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 DIP Switch 1 Two-Stage (O to R) cation or Cooling Heat Pumps Harmony...
  • Page 39 TABLE 15 Cont. 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 CONTROL...
  • Page 40 FIGURE 54 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 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 TABLE 21 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 44 Switches 14 through 19 -- Heating Mode Blower Speed On-Board Link W915 Y1 to Y2 (FIGURE 55) On-board link W915 is a clippable connection between These switches are factory set at the OFF position which terminals Y1 and Y2 on the integrated control. W915 must provides 100 % of normal speed during HIGH HEAT de- be cut if two-stage cooling will be used.
  • 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% 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 380 cfm. Lennox iHarmony Zoning System Applications - Minimum blower speed is 450 cfm. ®...
  • Page 48 TABLE 24 Allowable Heating Speeds SLP99UH -15% -7.5% Default +7.5% +15% Model All Models Allowed Allowed Factory Allowed Allowed TABLE 25 Allowable Circulation Speeds SLP99UH Model (Second Stage Cool) (second stage cool) All Models Allowed Factory Setting TABLE 26 COOLING OPERATING SEQUENCE SLP99UHV and Single-Stage Outdoor Unit OPERATING SEQUENCE SYSTEM DEMAND...
  • Page 49 TABLE 27 OPERATING SEQUENCE SLP99UHV 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 PLACING THE UNIT INTO OPERATION, smell Unit Start-Up all around the furnace area for gas. Be sure to smell next 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 SLP99UHV is WARNING equipped with a gas control switch.

  • Page 51: Gas Pressure Measurement

    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 52: Operating Pressure Signal Measurement

    MANIFOLD PRESSURE MEASUREMENT Gas Valve Field Installed FIGURE 57 Negative Port Operating Signal (Delta P) Measurement Positive Port Red and Black Tubing - Black Tubing + Gas Valve Field Installed Measuring Device FIGURE 58 Page 52...

  • Page 53: Proper Combustion

    TABLE 29 Manifold and Operating Signal Pressures in inches 0 - 7500 ft (0 - 2286 m) Manifold Pressure Natural Gas Manifold Pressure LP/Propane Operating Pressure Signal (Delta P) SLP99 Firing Rate 0.40 0.95 0.20 0.40 High 10.5 0.95 1.25 -090-060C Only 0.30 0.85...

  • Page 54: 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 55 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 56: 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 57 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 58: 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: SLP99UH070XV36B. All service must be performed by a licensed profession- al installer (or equivalent), service agency, or gas supplier.

  • Page 59: 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 60 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 61 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 62: 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 63: 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 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) 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 66 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 67 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 68 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 69 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 70 ADDENDUM FOR ALL PROVINCES OF CANADA See below for venting in all provinces of Canada. Lennox approves the following termination for use in all provices of Canada.

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