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2025 Lennox Industries Inc.
©
Dallas, Texas USA
WARNING
This furnace is equipped with an ignition control
factory enabled for use with Lennox A2L refrigerant
systems.
Disabling
functionality on A2L system is prohibited by safety
codes. Refer to furnace installation instructions for
non-A2L and non-Lennox refrigerant system setup.
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
SLP99UHVK 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
Gas Piping ....................................................................30
the
refrigerant
detection
INSTALLATION
INSTRUCTIONS
SLP99UHVK
DAVE LENNOX SIGNATURE
COLLECTION GAS FURNACES
UP/FLOW HORIZONTAL AIR DISCHARGE
508587-01
01/2025
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
Electrical .......................................................................33
Ignition Control .............................................................41
Low GWP Application ...................................................46
Blower Data ..................................................................49
Unit Start-Up .................................................................54
Gas Flow ......................................................................55
Operating Pressure Signal Measurement ....................55
Proper Combustion.......................................................57
High Altitude Information ..............................................57
Other Unit Adjustments.................................................57
Heating Sequence of Operation ...................................58
Service..........................................................................60
Repair Parts List ...........................................................62
Configuring Unit Size Codes ........................................63
Unit Set Up Check List .................................................72
Page 1
®
CAUTION
NOTICE
both
communicating
and
non-
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Summary of Contents for Lennox DAVE LENNOX SIGNATURE SLP99UHVK
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Page 1: Table Of Contents
WARNING NOTICE This furnace is equipped with an ignition control factory enabled for use with Lennox A2L refrigerant A thermostat is not included and must be ordered systems. Disabling refrigerant detection separately. -
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 BLOWER DRIVE INNER BLOWER ACCESS PANEL CONTROL BOX (includes variable capacity integrated control transformer circuit breaker and door switch and blower drive in some units) -
Page 4: Slp99Uhvk Gas Furnace
DANGER SLP99UHVK Gas Furnace The SLP99UHVK category IV gas furnace is equipped Danger of explosion. with a variable-capacity, variable-speed integrated con- There are circumstances in which odorant used with LP/ trol. This control ensures compatibility with a communi- propane gas can lose its scent. In case of a leak, LP/ cating thermostat, the iHarmony zone control system, ®... -
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
See FIGURE 4. FAILURE TO FOLLOW THE ABOVE INSTALLATION IN- STRUCTIONS VOIDS THE MANUFACTURER’S EQUIP- See figure 4. MENT LIMITED WARRANTY. LENNOX DISCLAIMS ALL LIABILITY IN CONNECTION WITH INSTALLER’S FAILURE TO FOLLOW THE ABOVE INSTALLATION IN- STRUCTIONS. NOTWITHSTANDING THE FOREGOING, INSTALLER... -
Page 7: Horizontal Application
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...
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Page 9: Horizontal Applications
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
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: Horizontal Left
TABLE 3 TABLE 4 Discharge Air Temperature Sensor Discharge Air Temperature Sensor Location Horizontal Left Location Horizontal Right SLP99UHK Mounting SLP99UHK 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 (Fittings) D2466 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 condensate collection trap and lines. NOTE - Lennox has approved the use of DuraVent® and Exhaust Piping FIGURE 23, FIGURE 24 and FIGURE Centrotherm vent pipe and terminations as an option to 26 (vent adapter) 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 *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.
- Page 18 TABLE 8 Cont. 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 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 locally adopted installation codes. two sides beneath the floor. Lennox recommends avoiding this location if possible. FIGURE 25 Page 20...
- Page 21 Crawl Space and Extended Horizontal Venting within 6 feet (1.8m) of an outdoor AC unit because the Lennox provides kit 51W18(USA) and kit 15Z70 (Canada) condensate can damage the painted coating. to install 2” or 3” PVC exhaust piping through the floor NOTE - See TABLE 9 for maximum allowed exhaust pipe 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 Vent Pipe Vent Pipe LARGER VENT PIPE SIZE TO TERMINATION A− Minimum clearance above grade or average 12” (305 mm) 12” (305 mm) snow accumulation B−...
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Page 26: Condensate Piping
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.
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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.
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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 to the right side of the furnace to facilitate installation. If IMPORTANT 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 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 Intact Intact...
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Page 38: Wiring Connections
TABLE 15 Cont. Field Wiring Connections for Non-Communicating Thermostat Applications (Continued) DIP Switch Settings and On-Board Links 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 2 Heat / 2 Cool Intact... - Page 39 TABLE 15 Cont. Field Wiring Connections for Non-Communicating Thermostat Applications (Contiued) DIP Switch Settings and On-Board Links 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 HEAT PUMP...
- Page 40 SLP99UHVK DIAGRAM FIGURE 54 Page 40...
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Page 41: Integrated Control
Integrated Control Modulating, Variable Speed and Communicating 107901-01 FIGURE 55 TABLE 16 TABLE 18 THERMOSTAT INPUT TERMINALS 1/4”QUICK CONNECT TERMINALS LOW STAGE HEAT 120 VAC OUTPUT TO HUMIDIFIER HIGH STAGE HEAT XMFR 120 VAC OUTPUT TO TRANSFORMER 120 VAC INPUT TO CONTROL LOW STAGE COOL CIRC 120 VAC OUTPUT TO CIRCULATING BLLOWER... -
Page 42: Ignition Control
IGNITION CONTROL DIAGNOSTIC CODES E164 Low GWP test Page 42... - Page 43 TABLE 19 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 44 Switches 8 and 9 - Cooling Mode Blower Speed TABLE 24 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 45 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.
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Page 46: Low Gwp Application
Low GWP Application WARNING For use with Lennox approved evaporator coil and LGWP sensors only. Use original manufacturer recommended LGWP sensors if using non Lennox approved evaporator coil. CONNECTING THE FURNACE CONTROL BOARD SENSOR. See FIGURE 58 and follow steps below: 1 - Route sensor wire #1 through provided grommet. - Page 47 FURNACE CONTROL BOARD LOW GWP MODES OF 2. The furnace control board activates the blower (high OPERATION speed). The blower purges refrigerant from the cabinet, plenum, and ductwork. The modes of operation for the furnace control board are Initializing, Normal, Leak Detected, and Fault. 3.
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Page 48: Start-Up Procedure
LGWP TEST BUTTON FUNCTIONALITY External Alarm (For applications with external alarms wired directly to the The furnace control board is equipped with a Test/Reset furnace control board) push button. The Test button can be used to perform sev- The furnace control board triggers the external alarm sys- eral functions, depending on the mode of operation of the tem when it enters Leak Detected mode. -
Page 49: 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 50 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 Smart Zoning System Applications - Minimum blower speed is 450 cfm. ®...
- Page 51 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 Smart Zoning System Applications - Minimum blower speed is 450 cfm. ®...
- Page 52 TABLE 30 Allowable Heating Speeds SLP99UHK -15% -7.5% Default +7.5% +15% Model All Models Allowed Allowed Factory Allowed Allowed TABLE 31 Allowable Circulation Speeds SLP99UHK Model (Second Stage Cool) (second stage cool) All Models Allowed Factory Setting TABLE 32 COOLING OPERATING SEQUENCE SLP99UHVK and Single-Stage Outdoor Unit OPERATING SEQUENCE SYSTEM DEMAND...
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Page 53: Operating Sequence
TABLE 33 OPERATING SEQUENCE SLP99UHVK 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 54: 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 SLP99UHVK is WARNING equipped with a gas control switch. -
Page 55: Gas Flow
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 56 MANIFOLD PRESSURE MEASUREMENT Gas Valve Field Installed FIGURE 60 Negative Port Operating Signal (Delta P) Measurement Positive Port Red and Black Tubing - Black Tubing + Gas Valve Field Installed Measuring Device FIGURE 61 Page 56...
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Page 57: Proper Combustion
TABLE 35 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) SLP99K 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 58: Electronic Ignition
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 59 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.
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Page 60: 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: 15 - Inspect the Low GWP sensor / sensors and rubber... - Page 61 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.
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Page 62: 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: SLP99UH070XV36BK. All service must be performed by a licensed profes- sional installer (or equivalent), service agency, or gas supplier. -
Page 63: 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 64: 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 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) 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 67 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 68 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 69 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...
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Page 70: Approved Carbon Monoxide Detectors
4 - INSPECTION. The state or local gas inspector of the Requirements for Commonwealth of Massachusetts side wall, horizontally vented, gas-fueled equipment Modifications to NFPA-54, Chapter 10 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 71 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”...
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Page 72: Gas Supply
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 73: Unit Operation
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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