Lennox DAVE SIGNATURE SL280DFV Installation Instructions Manual
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Lennox DAVE SIGNATURE SL280DFV Installation Instructions Manual

Gas furnace downflow air discharge
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2022 Lennox Industries Inc.
©
Dallas, Texas USA
CAUTION
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.
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.
Contents
Unit Dimensions - inches (mm) ......................................2
Parts Arrangement..........................................................3
Shipping and Packing List ..............................................4
Safety Information ..........................................................4
Use of Furnace as Construction Heater .........................5
General ...........................................................................5
Combustion, Dilution & Ventilation Air ............................6
Setting Equipment ........................................................10
Filters ............................................................................ 11
Duct System / Venting ..................................................12
Gas Piping ....................................................................18
Electrical .......................................................................20
INSTALLATION
INSTRUCTIONS
SL280DFV
DAVE LENNOX SIGNATURE®
COLLECTION GAS FURNACE
DOWNFLOW AIR DISCHARGE
508246-01
02/2022
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
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.
A thermostat is not included and must be ordered
separately.
• A Lennox 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 both communicating and non-
communicating applications is illustrated in diagrams,
which begin on Page 22.
Integrated Control .........................................................29
Integrated Control DIP Switch Settings - ......................30
Blower Data ..................................................................33
Unit Start-Up .................................................................37
Proper Combustion.......................................................38
High Altitude .................................................................39
Heating Sequence of Operation ...................................40
Service..........................................................................42
Repair Parts List ...........................................................43
Integrated Control Diagnostic Modes ...........................44
Program Unit Capacity / Size Mode .............................51
Page 1
WARNING
NOTICE

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Summary of Contents for Lennox DAVE SIGNATURE SL280DFV

  • Page 1: Table Of Contents

    HVAC installer or equivalent, service agency, or the gas supplier. NOTICE A thermostat is not included and must be ordered separately. • A Lennox communicating thermostat must be used in communicating applications. CAUTION • In non-communicating applications, the Lennox ComfortSense 7500 thermostat may be used, as well ®...

  • Page 2: Unit Dimensions - Inches (Mm)

    Unit Dimensions - inches (mm) 3-1/8 9/16 (79) (14) RETURN AIR OPENING FLUE OUTLET 19-7/16 9/16 (Top) (494) (14) 9/16 (14) TOP VIEW 1-1/2 (38) 27-3/4 (705) Front Panel 9/16 19-7/16 9/16 (14) (494) (14) AIR FLOW ELECTRICAL INLET (Either Side) (838) 5-3/8 (137) Right GAS PIPING INLET...

  • Page 3: Parts Arrangement

    Parts Arrangement BLOWER ASSEMBLY SECONDARY LIMIT GASKET FLUE CHASE CONTROL BOX (Includes two-stage integrated control, transformer and circuit breaker) INTERNAL FLUE PIPE ASSEMBLY DOOR INTERLOCK SWITCH PRIMARY LIMIT LOCATION HEAT EXCHANGER COMBUSTION AIR INDUCER PRESSURE SWITCHES COMBUSTION AIR INDUCER GAS VALVE INNER BLOWER ACCESS PANEL BURNER BOX ASSEMBLY ACCESS PANEL...

  • Page 4: Shipping And Packing List

    In the USA, installation of gas furnaces must conform with ble with: local building codes. In the absence of local codes, units Lennox communicating thermostats. must be installed according to the current National Fuel Gas Code (ANSI-Z223.1). The National Fuel Gas Code is...

  • Page 5: Use Of Furnace As Construction Heater

    The furnace should Use of Furnace as Construction Heater also be located close to the chimney or vent termi- Lennox does not recommend the use of SL280DFV unitss nation point. a construction heater during any phase of construction.

  • Page 6: Combustion, Dilution & Ventilation Air

    NOTE - The Commonwealth of Massachusetts stipulates CAUTION these additional requirements: Insufficient combustion air can cause headaches, • Gas furnaces shall be installed by a licensed nausea, dizziness or asphyxiation. It will also cause plumber or fitter only. excess water in the heat exchanger resulting in rusting •...
  • Page 7 Confined Space Air from Inside A confined space is an area with a volume less than 50 If the confined space that houses the furnace adjoins a cubic feet (1.42 m3) per 1,000 Btu (.29 kW) per hour of space categorized as unconfined, air can be brought in by the combined input rating of all appliances installed in that providing two permanent openings between the two spac- space.
  • Page 8 EQUIPMENT IN CONFINED SPACE ALL AIR FROM OUTSIDE (Inlet Air from Crawlspace and Outlet Air to Ventilated Attic) CHIMNEY OR GAS VENT VENTILATION LOUVERS (Each end of attic) OUTLET WATER FURNACE HEATER INLET VENTILATION LOUVERS (For unheated crawl space) AIR FLOW NOTE-The inlet and outlet air openings shall each have a free area of at least one square inch (645 ) per 4,000 Btu (1.17 kW) per hour of the total input rating of all equipment in the enclosure.
  • Page 9 CAUTION Downflow Installation Downflow unit installs in three ways: on non-combustible The furnace and downflow combustible flooring base flooring, on combustible flooring using a downflow com- shall not be installed directly on carpeting, tile, or other bustible flooring base, or on a reverse-flow cooling cabi- combustible material other than wood flooring.

  • Page 10: Setting Equipment

    Setting Equipment WARNING UNIT Do not install the furnace on its front, back or in the horizontal position. See FIGURE 12. Do not connect the return air ducts to the back of the furnace. Doing so will adversely affect the operation of the safety control COOLING COIL devices, which could result in personal injury or death.

  • Page 11: Filters

    Horizontal Front Back FIGURE 12 Downflow Application CAUTION Allow for clearances to combustible materials as indicated If this unit is being installed in a space serviced by an on the unit nameplate. Minimum clearances for closet or exhaust fan, power exhaust fan, or other device which alcove installations are shown in FIGURE 13.

  • Page 12: Duct System / Venting

    NOTE - Use these instructions as a guide. They do not manufacturer against the data given in the appropriate supersede local codes. This furnace must be vented ac- Lennox Product Specifications bulletin. Additional cording to all local codes, these installation instructions, information is provided in Service and Application Note and the provided venting tables in these instructions.
  • Page 13 Common Venting Using Tile-Lined Interior Masonry Chimney and Combined Vent Connector MINIMUM LENGTH = AS SHORT AS PRACTICAL. INTERIOR TILE-LINED FOR MAXIMUM LENGTH SEE NOTE TO LEFT MASONRY CHIMNEY NOTE- Refer to provided venting tables for installations. NOTE - the chimney must be properly sized per provided venting tables or lined with listed metal lining system.
  • Page 14 A fan-assisted furnace may be commonly vented into an 6 - The entire length of single wall metal vent connector existing lined masonry chimney if the following conditions shall be readily accessible for inspection, cleaning, are met: and replacement. 7 - Single appliance venting configurations with zero •...
  • Page 15 14 - All venting pipe passing through floors, walls, and 19 - In no case, shall the vent connector be sized more ceilings must be installed with the listed clearance than two consecutive table size diameters over the to combustible materials and be fire stopped size of the draft hood outlet or flue collar outlet.
  • Page 16 TABLE 5 Capacity of Type B Double-Wall Vents with Type B Double-Wall Connectors Serving a Single Category I Appliance Vent and Connector Diameter - D (inches) Height Lateral 3 inch 4 inch 5 inch 6 inch Appliance Input Rating in Thousands of Btu Per Hour (feet) (feet) NOTE - Single appliance venting configurations with zero lateral lengths are assumed to have no elbows in the vent system.
  • Page 17 TABLE 6 Vent Connector Capacity Type B Double-Wall Vents with Type B Double-Wall Connectors Serving Two or More Category I Appliances Vent and Connector Diameter - D (inches) Height Lateral 3 inch 4 inch 5 inch 6 inch Appliance Input Rating in Thousands of Btu Per Hour (feet) (feet) TABLE 7...

  • Page 18: Gas Piping

    Removal of the Furnace from Common Vent Resize the common venting system to the minimum vent pipe size determined by using the appropriate tables in In the event that an existing furnace is removed from a Appendix G. (These are in the current standards of the venting system commonly run with separate gas applianc- National Fuel Gas Code ANSI Z223.1.
  • Page 19 TABLE 8 Gas Pipe Capacity - ft3/hr (m3/hr) Nominal Internal Length of Pipe - feet (m) Iron Pipe Diameter Size Inches inches (3.048) (6.096) (9,144) (12,192) (15.240) (18.288) (21.336) (24.384) (27.432) (30,480) (mm) (mm) .622 (12.7) (17.799) (4.87) (3.34) (2.69) (2.29) (2.03) (1.84)

  • Page 20: Electrical

    The unit is equipped with a field make-up box on the left The furnace must be isolated from the gas supply system hand side of the cabinet. The make-up box may be moved by closing the individual manual shut-off valve during any gas supply system at pressures greater than or equal to ½...
  • Page 21 2 - When there is a heating demand the fan will run on For optimal performance in non-communicating applica- heating speeds for firing rate. tions, Lennox recommends use of a ComfortSense 7000 ® 3 - When there is a cooling demand, the fan will run on...
  • Page 22 Generator Use - Voltage Requirements • The furnace integrated control requires both correct polarity and proper ground. Both polarity and proper The following requirements must be kept in mind when grounding should be checked before attempting to specifying a generator for use with this equipment: operate the furnace on either permanent or tempo- •...
  • Page 23 Optional Accessories for use with Communicating System NOTE: COMMUNICATING THERMOSTAT SENSES HUMIDITY 120V CONNECTIONS & CONTROLS HUM CONTACTS TO CYCLE HUMIDIFIER BASED ON DEMAND. NO OTHER CONTROL OR HUMIDISTAT REQUIRED. “HUM” CONTACT IS CLOSED ANYTIME OPTIONAL OUTDOOR AIR SENSOR FOR USE WITH HUMIDI− HUMIDITY DEMAND FIER (IF NOT ALREADY IN THE SYSTEM FOR OTHER FUNC−...
  • Page 24 LENNOX COMMUNICATING OUTDOOR UNIT INDOOR UNIT (1 OR 2 STAGE) FLOAT SWITCH LENNOX COMMUNICATING OUTDOOR UNIT LENNOX COMMUNICATING FURNACE EL296V, SL280V, SL280VN, SL297V, SLP99V cutting DS to R will not cause communication interuption or error code CUT* R−DS W914 FIGURE 2...
  • Page 25 TABLE 10 SL280 Field Wiring Applications With Conventional Thermostat DIP Switch Settings and On-Board Links DIP Switch 1 On Board Links Must Be Cut To Select Thermostat Thermostat Wiring Connections System Options Heating Stages 1 Heat / 1 Cool FURNACE OUTDOOR T'STAT TERM.
  • Page 26 TABLE 10 SL280 Field Wiring Applications With Conventional Thermostat DIP Switch Settings and On-Board Links DIP Switch 1 On Board Links Must Be Cut To Select Thermostat Thermostat Wiring Connections System Options Heating Stages 2 Heat / 2 Cool FURNACE OUTDOOR T'STAT TERM.
  • Page 27 TABLE 10 SL280 Field Wiring Applications With Conventional Thermostat DIP Switch Settings and On-Board Links DIP Switch 1 Wiring Connections Thermostat On Board Links Must Be Cut To Select Thermostat Heating System Options Stages Dual Fuel FURNACE HEAT PUMP L7742U TERM.
  • Page 28 TABLE 10 SL280 Field Wiring Applications With Conventional Thermostat DIP Switch Settings and On-Board Links DIP Switch 1 Wiring Connections Thermostat On Board Links Must Be Cut To Select Thermostat Heating System Options Stages Dual Fuel FURNACE HEAT PUMP L7742U TERM.
  • Page 29 FIGURE 22 Page 29...

  • Page 30: Integrated Control

    Integrated Control RS-BUS LINK (TB82, future use) THERMOSTAT CONNECTIONS (TB1) DS = DEHUMIDIFICATION SIGNAL I+ = DATA HIGH CONNECTION W2 = HEAT DEMAND FROM 2ND STAGE T/STAT I - = DATA LOW CONNECTION W1 = HEAT DEMAND FROM 1ST STAGE T/STAT R = 24VAC I + = DATA HIGH CONNECTION R = CLASS 2 VOLTAGE TO THERMOSTAT...

  • Page 31: Integrated Control Dip Switch Settings

    Integrated Control DIP Switch Settings - TABLE 11 Blower Off Delay Switch Settings Conventional Thermostat (non-communicating) Blower Off Delay SL280DFV units are equipped with a two-stage, variable Switch 3 Switch 4 (Seconds) speed integrated control. This control manages ignition timing, heating mode fan off delays and indoor blower speeds based on selections made using the control dip 90 (factory) switches and jumpers.
  • Page 32 NOTE - The off portion of the selected ramp profile also Ramping Option D applies during heat pump operation in dual fuel applica- • Motor runs at 100% until demand is satisfied. tions. • Once demand is met, motor ramps down to stop. TABLE 14 Cooling Mode Speed Ramping 100% CFM...
  • Page 33 Diagnostic LED (FIGURE 23) On-Boards Links The seven-segment diagnostic LED displays operating Note: In communicating systems with a conventional status, target airflow, error codes and other information. outdoor unit (non-communicating), the on-board clippable The table beginning on Page 45 lists diagnostic LED links must be set to properly configure the system.

  • Page 34: Blower Data

    First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position. Continuous Fan Only speed is selectable at 28% and 38% of the selected second stage cooling speed - minimum 250 cfm. Lennox iHarmony Zoning System Applications - Minimum blower speed is 250 cfm.
  • Page 35 First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position. Continuous Fan Only speed is selectable at 28% and 38% of the selected second stage cooling speed - minimum 450 cfm. Lennox iHarmony Zoning System Applications - Minimum blower speed is 450 cfm.
  • Page 36 W914 (R to DS) on SureLight® control With Heat Pump - Cut W914 (R to DS) & W951 (R to O) on SureLight® control Dave Lennox ComfortSense® 7500 thermostat to use for this application - Y2081 4 heat / 2 cool *Dehumidification blower speed is 70% of COOL speed for all units .
  • Page 37 With Heat Pump - Cut W914 (R to DS) & W951 (R to O) on SureLight® control Dave Lennox ComfortSense® 7500 thermostat to use for this application - Y2081 4 heat / 2 cool *Normal operation first stage cooling blower speed is 70% COOL speed.

  • Page 38: Unit Start-Up

    Gas Valve Operation (FIGURE 24) Unit Start-Up 1 - STOP! Read the safety information at the beginning FOR YOUR SAFETY READ BEFORE LIGHTING of this section. WARNING 2 - Set the thermostat to the lowest setting. 3 - Turn off all electrical power to the unit. Do not use this furnace if any part has been underwater.

  • Page 39: Proper Combustion

    NOTE - Pressure test adapter kit (10L34) is available from 6 - Is gas turned on at the meter? Lennox to facilitate manifold pressure measurement. 7 - Is the manual main shut-off valve open? A manifold pressure tap located on the gas valve provides 8 - Is the internal manual shut-off valve open? access to the manifold pressure.

  • Page 40: High Altitude

    IMPORTANT High Altitude The manifold pressure, gas orifice and pressure switch .For safety, shut unit off and remove manometer as soon may require adjustment or replacement to ensure proper as an accurate reading has been obtained. Take care to operation at higher altitudes. Tables 21 through 23 shows replace pressure tap plug.

  • Page 41: Heating Sequence Of Operation

    1 - On a call for heat, thermostat first-stage contacts Other Unit Adjustments close sending a signal to the integrated control. The Primary and Secondary Limits integrated control runs a self-diagnostic program and checks high temperature limit switches for The primary limit is located on the heating compartment normally closed contacts and pressure switches for vestibule panel.
  • Page 42 Applications Using A Single-Stage Thermostat See FIGURE 26 for ignition control sequence 4 - After the 20-second warm-up period has ended, the gas valve is energized on low fire (first stage) B - Heating Sequence -- Control Thermostat Selection and ignition occurs. At the same time, the control DIP Switch 1 ON in “Single-Stage”...

  • Page 43: Service

    At the beginning of each heating season, and to comply Perform a general system test. Turn on the furnace to with the Lennox Limited Warranty, your system should be check operating functions such as the start-up and shut- checked as follows: off operation.

  • Page 44: Repair Parts List

    7 - 8- Reconnect all wires. Repair Parts List The following repair parts are available through independent Lennox dealers. When ordering parts, include the complete furnace model number listed on the CSA International nameplate -- Example: SL280DF070V36A. All service must be performed by a licensed professional installer (or equivalent), service agency, or gas supplier.

  • Page 45: Integrated Control Diagnostic Modes

    Integrated Control Diagnostic Modes Display Action (when button is released) No change (idle)* Remain in idle mode Solid “E” Enter diagnostic recall mode Solid “U” Discharge Air Installed Solid “F” Enter flame signal mode Solid “F” (variable speed only) Program unit capacity size (Unit Code) Two horizontal lines soft disable * No change implies the display will continue to show...
  • Page 46 Integrated Control Diagnostic Codes Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover Idle mode (Decimal blinks at 1 Hertz -- 0.5 second ON, 0.5 second OFF). Cubic feet per minute (cfm) setting for indoor blower (1 second ON, 0.5 second OFF) / cfm setting for current mode displayed.
  • Page 47 Integrated Control Diagnostic Codes Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E124 Active communicating thermostat signal Equipment lost communication with the thermostat. Check missing for more than 3 minutes. four wiring connections, ohm wires and cycle power at the thermostat.
  • Page 48 Integrated Control Diagnostic Codes Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E206 Gas valve second-stage relay failure Furnace will operate on 1st stage for remainder of the heating demand. Will clear after fault recovered. If un- able to operate 2nd stage, replace control.
  • Page 49 Integrated Control Diagnostic Codes Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E271 Soft lockout - Exceeded maximum number of re- Check pressure (inches w.c.) of low pressure switch clos- tries. Last retry failed due to the pressure switch ing on heat call.
  • Page 50 Integrated Control Diagnostic Codes Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E312 Restricted air flow in cooling or continu- Warning Only. Restricted airflow - Indoor blower is running at a re- ous fan mode is lower than cfm setting. duced CFM (Cutback Mode - The variable speed motor has pre-set speed and torque limiters to protect the motor from damage caused by operating outside of design parameters (0 to 0.8”...

  • Page 51: Troubleshooting: Heating Sequence Of Operation

    Troubleshooting: Heating Sequence of Operation − − 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 52 CALL FOR FIRST-STAGE HEAT CALL FOR 1ST STAGE HEAT (LOW FIRE) INDOOR BLOWER OFF AFTER HEAT FAN OFF DELAY (LOW HEAT SPEED) INDOOR LIMIT BLOWER OFF HIGH ERROR INDOOR SWITCH WATCHGUARD − AFTER HEAT FAN LIMIT SWITCH CODE BLOWER CLOSED WITHIN 3 ERROR CODE OFF DELAY (LOW CLOSED?
  • Page 53 Troubleshooting: Heating Sequence of Operation (Continued) CALL FOR SECOND-STAGE HEAT CALL FOR 2ND STAGE HEAT (HIGH FIRE) SINGLE STAGE 2 STAGE THERMOSTAT THERMOSTAT 2ND STAGE RECOGNITION DELAY ON DELAY (30 SECONDS) EXPIRED? EXPIRED? ONLY FOR 1ST REQUEST FOR 2ND STAGE HEAT INDUCER SWITCHED TO HIGH SPEED HIGH...
  • Page 54 Troubleshooting: Heating Sequence of Operation (Continued) CALL FOR HEAT SATISFIED FIRST-STAGE HEAT SECOND-STAGE HEAT RUN MODE: 1ST OR 2ND STAGE CALL FOR HEAT. ALL INPUTS MONITORED (LIMIT, PRESSURE, CALL FOR HEAT/COOL, FLAME LEVEL) 2ND STAGE HEAT 2ND STAGE CALL FOR HEAT SATISFIED? DE−ENERGIZE 2ND STAGE GAS VALVE...
  • Page 55 Troubleshooting: Cooling Sequence of Operation CALL FOR COOLING 1ST STAGE COOLING REQUEST RECEIVED WAIT FOR COMPRESSOR TIMED OFF DELAY TO EXPIRE ENERGIZE 1ST STAGE COOLING CONTACTOR (COMPRESSOR & FAN) INDOOR BLOWER 2 SECOND ON DELAY ENERGIZE INDOOR BLOWER (LOW COOLING MODE) MAINTAIN INDOOR BLOWER (LOW COOLING MODE)
  • Page 56 Troubleshooting: Continuous Fan Sequence of Operation CALL FOR FAN CALL FOR FAN INDOOR BLOWER ON CONTINUOUS FAN SPEED CALL FOR FAN MAINTAIN INDOOR BLOWER AT REMOVED? CONTINUOUS FAN REQUEST MAINTAIN INDOOR FOR COOLING GO TO CALL FOR COOLING BLOWER AT RECEIVED? CONTINUOUS FAN REQUEST...

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