Lennox SL280V Installation Instructions Manual
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Lennox SL280V Installation Instructions Manual

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E 2011 Lennox Industries Inc.
Dallas, Texas, USA
CAUTION
As with any mechanical equipment, personal injury
can result from contact with sharp sheet metal
edges. Be careful when you handle this equipment.
This is a safety alert symbol and should never be ignored.
When you see this symbol on labels or in manuals, be alert
to the potential for personal injury or death.
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06/11
*2P0611*
DOWNFLOW
AIR FLOW

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INSTALLATION
INSTRUCTIONS
SL280DFV
DAVE LENNOX SIGNATURE
COLLECTION GAS FURNACE
DOWNFLOW AIR DISCHARGE
506710−01
06/2011
Supersedes 01/2011
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person-
al injury or loss of life. Installation and service must
be performed by a licensed professional installer (or
equivalent), service agency or the gas supplier.
A thermostat is not included and must be ordered
separately.
D The Lennox icomfort Toucht thermostat must be
used in communicating applications.
D In non−communicating applications, the Lennox
ComfortSense
well as other non−communicating thermostats.
In all cases, setup is critical to ensure proper sys-
tem operation.
Field wiring for both communicating and non−com-
municating applications is illustrated in diagrams,
which begin on Page 23.
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WARNING
NOTICE
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7000 thermostat may be used, as
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Litho U.S.A.
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  • Page 1: Table Of Contents

    DOWNFLOW NOTICE AIR FLOW A thermostat is not included and must be ordered separately. D The Lennox icomfort Toucht thermostat must be used in communicating applications. D In non−communicating applications, the Lennox CAUTION ® ComfortSense 7000 thermostat may be used, as well as other non−communicating thermostats.

  • Page 2: Unit Dimensions

    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 27−3/4 1−1/2 (38) (7705) Front Panel 9/16 19−7/16 9/16 (14) (494) (14) ELECTRICAL INLET (Either Side) (838) 5−3/8 (137) Right GAS PIPING INLET 2−1/8 (54) Left...

  • 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 ROLLOUT SWITCH HEAT EXCHANGER COMBUSTION AIR INDUCER PRESSURE SWITCHES COMBUSTION AIR INDUCER GAS VALVE INNER BLOWER ACCESS PANEL BURNER BOX ASSEMBLY...

  • Page 4: Sl280Dfv Gas Furnace

    SL280DFV Gas Furnace CAUTION The SL280DFV gas furnace is equipped with a two−stage, As with any mechanical equipment, personal injury can result from contact with sharp sheet metal variable speed integrated control. the control is compat- edges. Be careful when you handle this equipment. ible with: ®...

  • Page 5: Use Of Furnace As A Construction Heater

    When the furnace is installed in an attic or other insu- lated space, keep insulation away from the furnace. Lennox does not recommend the use of SL280DFV units NOTE − The Commonwealth of Massachusetts stipu- as a construction heater during any phase of construction.

  • Page 6: Combustion, Dilution & Ventilation Air

    Cements and glues supervisor. Antistatic fabric softeners for clothes dryers Lennox Industries Inc. Masonry acid washing materials P.O. Box 799900 All gas-fired appliances require air for the combustion pro- Dallas, TX 75379−9900 cess.
  • Page 7 Confined Space Air from Inside If the confined space that houses the furnace adjoins a A confined space is an area with a volume less than 50 cu- space categorized as unconfined, air can be brought in by bic feet (1.42 m ) per 1,000 Btu (.29 kW) per hour of the providing two permanent openings between the two combined input rating of all appliances installed in that...
  • 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) 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 Downflow Installation CAUTION Downflow unit installs in three ways: on non−combustible The furnace and downflow combustible flooring flooring, on combustible flooring using a downflow com- base shall not be installed directly on carpeting, tile, bustible flooring base, or on a reverse−flow cooling cabinet. or other combustible material other than wood floor- Do not drag the unit across the floor.

  • Page 10: Setting Equipment

    Setting Equipment SL280DFV UNIT WARNING 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 COOLING COIL will adversely affect the operation of the safety con- trol devices, which could result in personal injury or PROPERLY death.

  • Page 11: Filters

    Horizontal Front Back FIGURE 12 Downflow Application WARNING Allow for clearances to combustible materials as indi- cated on the unit nameplate. Minimum clearances for Improper installation of the furnace can result in per- closet or alcove installations are shown in figure 13. sonal injury or death.

  • Page 12: Duct System

    Refer to the tables and the venting information contained in Duct System these instructions to properly size and install the venting Use industry-approved standards (such as those pub- system. lished by Air Conditioning Contractors of America or Ameri- can Society of Heating, Refrigerating and Air Conditioning IMPORTANT Engineers) to size and install the supply and return air duct system.
  • 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 Never connect a Category I appliance to a chimney that is TABLE 4 servicing a solid−fuel appliance. If a fireplace chimney flue Maximum Horizontal Connector Diameter is used to vent this appliance, the fireplace opening must Connector Length feet (m) inches (mm) be permanently sealed.
  • Page 15 18 − The common vent diameter must always be at least as 21 − When connecting this appliance to an existing dedi- large as the largest vent connector diameter. cated or common venting system, you must inspect the 19 − In no case, shall the vent connector be sized more than venting system’s general condition and look for signs two consecutive table size diameters over the size of of corrosion.
  • Page 16 TABLE 6 Capacity of Type B Double−Wall Vents with Single−Wall Metal 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 −...
  • Page 17 TABLE 7 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) Vent Connector 3 Inch 4 Inch 5 Inch 6 Inch Height Rise Appliance Input Rating in Thousands of Btu Per Hour (feet) (feet)
  • Page 18 TABLE 9 Vent Connector Capacity Type B Double−Wall Vents with Single−Wall Metal 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) NOTE −...

  • Page 19: Gas Piping

    Removal of the Furnace from Common Vent 7 − If a venting problem is found during any of the preced- ing tests, the common venting system must be modi- In the event that an existing furnace is removed from a fied to correct the problem.
  • Page 20 TABLE 11 Gas Pipe Capacity − ft /hr (m /hr) Nominal Length of Pipe − feet (m) Internal Iron Pipe Diameter Size inches inches (mm) (3.048) (6.096) (9.144) (12.192) (15.240) (18.288) (21.336) (24.384) (27.432) (30.480) (mm) .622 (12.7) (17.799) (4.96) (3.40) (2.75) (2.32)

  • Page 21: Electrical

    Leak Check Refer to figure 24 for unit field wiring. See figures 21 and 22 ® for icomfort Touch thermostat wiring in communicating After gas piping is completed, carefully check all piping applications. Table 13 shows DIP switch and on−board link connections (factory−...
  • Page 22 For optimal performance in non−communicating applica- ® tions, Lennox recommends use of a ComfortSense 7000 4 − Before connecting the thermostat or the power wiring, high quality electronic digital thermostat or any other with...
  • Page 23 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 op- specifying a generator for use with this equipment: erate the furnace on either permanent or temporary The furnace requires 120 volts (Range: 102 volts to power...
  • Page 24 ® Optional Accessories for use with any icomfort Touch System ® NOTE: icomfort Touch THERMOSTAT SENSES HUMIDITY & CONTROLS HUM CONTACTS TO CYCLE HUMIDIFIER 120V CONNECTIONS BASED ON DEMAND. NO OTHER CONTROL OR HUMIDIS- TAT REQUIRED. HUM" CONTACT IS CLOSED ANYTIME OPTIONAL OUTDOOR AIR SENSOR FOR USE WITH HU- HUMIDITY DEMAND MIDIFIER (IF NOT ALREADY IN THE SYSTEM FOR OTHER...
  • Page 25 TABLE 13 SL280 Field Wiring Applications With Conventional Thermostat DIP Switch Settings and On−Board Links (See figure 25) 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...
  • Page 26 TABLE 13 SL280 Field Wiring Applications With Conventional Thermostat (Continued) DIP Switch Settings and On−Board Links (See figure 25) 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...
  • Page 27 TABLE 13 SL280 Field Wiring Applications With Conventional Thermostat (Continued) DIP Switch Settings and On−Board Links (figure 25) DIP Switch 1 Thermostat On Board Links Must Be Cut To Select Wiring Connections Thermostat Heating System Options Stages Dual Fuel FURNACE HEAT PUMP L7724U TERM.
  • Page 28 TABLE 13 SL280 Field Wiring Applications With Conventional Thermostat (Continued) DIP Switch Settings and On−Board Links (figure 25) DIP Switch 1 Thermostat On Board Links Must Be Cut To Select Wiring Connections Thermostat Heating System Options Stages Dual Fuel FURNACE HEAT PUMP L7724U TERM.
  • Page 29 SL280DFV Schematic Wiring Diagram FIGURE 23 Page 29...
  • Page 30 TYPICAL SL280DFV FIELD WIRING DIAGRAM FIELD INSTALLED CLASS II 24V FIELD INSTALLED LINE VOLTAGE FIGURE 24 Page 30...
  • Page 31 Integrated Control HS/ CAI LINE 1 NEUTRAL 7 SEGMENT LED FLAME SENSE INDOOR BLOWER DIAGNOSTIC CONNECTOR PUSH BUTTON DIP SWITCHES 12 PIN LOW OUTDOOR AIR VOLTAGE SENSOR CONNECTOR TERMINALS DISCHARGE AIR W915 Y1 TO Y2 SENSOR 2 STAGE COMPR TERMINALS W951 R TO O HEAT PUMP TB83...

  • Page 32: Integrated Control Settings

    supply air temperature between 90° and 110°F at the exact Integrated Control DIP Switch Settings − moment that the blower is de−energized. Longer off delay Conventional Thermostat (non−communi- settings provide lower supply air temperatures; shorter set- cating) tings provide higher supply air temperatures.Table 14 pro- vides the blower off timings that will result from different SL280DFV units are equipped with a two−stage, variable speed integrated control.
  • Page 33 NOTE − The off portion of the selected ramp profile also ap- Ramping Option D S Motor runs at 100% until demand is satisfied. plies during heat pump operation in dual fuel applications. TABLE 17 S Once demand is met, motor ramps down to stop. Cooling Mode Blower Speed Ramping Ramping Option Switch 9...
  • Page 34 minals Y1 and Y2 on the integrated control. W915 must be On−Board Links cut if two−stage cooling will be used. If the Y1 to Y2 link is not cut the outdoor unit will operate in second−stage cooling Note: In icomfortt systems with a conventional outdoor only.

  • Page 35: Blower Performance Data

    Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 500 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 425 cfm. SL280DF090V48B BLOWER PERFORMANCE (less filter) 0 through 0.8 in.
  • Page 36 Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 500 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 480 cfm. SL280DF110V60C BLOWER PERFORMANCE (less filter) 0 through 0.8 in.
  • Page 37 TABLE 20 SL280DFV, Non−Communicating Thermostat with Humidity Control Feature and Single−Speed Outdoor Unit OPERATING SYSTEM DEMAND SYSTEM RESPONSE SEQUENCE Thermostat Demand Relative Humidity Blower System Step Compressor Comments Condition Status (COOL) NO CALL FOR DEHUMIDIFICATION Compressor and indoor Normal Operation Acceptable High 100%...
  • Page 38 TABLE 21 SL280DFV, Non−Communicating Thermostat with Humidity Control Feature and Two−Speed Outdoor Unit OPERATING SYSTEM DEMAND SYSTEM RESPONSE SEQUENCE Thermostat Demand Relative Humidity Blower System Step Compressor Comments Condition Status (COOL) NO CALL FOR DEHUMIDIFICATION Normal Operation − Acceptable 70%* Compressor and indoor blower follow thermostat Normal Operation −...

  • Page 39: Unit Start−Up

    Gas Valve Operation (Figures 26 and 27) Unit Start−Up 1 − STOP! Read the safety information at the beginning of FOR YOUR SAFETY READ BEFORE LIGHTING this section. 2 − Set the thermostat to the lowest setting. 3 − Turn off all electrical power to the unit. WARNING 4 −...

  • Page 40: Gas Pressure Adjustment

    NOTE − Pressure test adapter kit (10L34) is available from 11 − Is the rollout switch tripped? If the switch is tripped call Lennox to facilitate manifold pressure measurement. the service technician to inspect the unit. 1 − Connect test gauge to manifold pressure post (figure Gas Pressure Adjustment 26) or tap (figure 27) on gas valve.

  • Page 41: High Altitude

    High Altitude IMPORTANT The manifold pressure, gas orifice and pressure switch For safety, shut unit off and remove manometer as may require adjustment or replacement to ensure proper soon as an accurate reading has been obtained. operation at higher altitudes. Tables 24 through 27 shows Take care to replace pressure tap plug.

  • Page 42: Other Unit Adjustments

    sending a signal to the integrated control. The inte- Other Unit Adjustments grated control runs a self-diagnostic program and Primary and Secondary Limits checks high temperature limit switches for normally closed contacts and pressure switches for normally The primary limit is located on the heating compartment open contacts.
  • Page 43 Applications Using A Single−Stage Thermostat 4 − After the 20−second warm−up period has ended, the gas See figure 29 for ignition control sequence valve is energized on low fire (first stage) and ignition oc- curs. At the same time, the control module sends a sig- B −...

  • Page 44: Service

    Electrical Service 1 − Check all wiring for loose connections. 2 − Check for the correct voltage at the furnace (furnace operating). Correct voltage is 120VAC + 10%. WARNING 3 − Check amp−draw on the blower motor with inner blow- er access panel in place.
  • Page 45 SL280DFV BURNER, COMBUSTION AIR INDUCER ASSEMBLY & HEAT EXCHANGER REMOVAL gasket orifice plate orifice plate gasket gasket flue chase internal flue pipe internal flue pipe combustion air inducer combustion air inducer rollout switch ignitor burner box assembly burner box assembly collector box collector box heat exchanger...
  • Page 46 12− To clean the combustion air inducer visually inspect and 22− Repeat steps 21 and 23 until no leaks are detected. using a wire brush clean where necessary. Use com- 23− Replace access panel. pressed air to clean off debris and any rust. 13−...

  • Page 47: Planned Service

    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 48: Integrated Control Diagnostic Codes

    Integrated Control Diagnostic Modes Display Action (when button released) No change (idle)* Remain in idle mode Solid E" Enter diagnostic recall mode Solid D" Discharge Air Installed Solid F" Enter flame signal mode Solid P" (variable speed only) Program unit capacity/size (Unit Code)** * No change implies the display will continue to show whatever is currently being displayed for normal operation (blinking decimal, active error code, heat state, etc..) ** After the P"...
  • Page 49 Integrated Control Diagnostic Codes (continued) Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E 105 Device communication problem − No other devices on RS BUS (Commu- Equipment is unable to communicate. Indicates nication numerous message errors. In most cases errors are system).
  • Page 50 Integrated Control Diagnostic Codes (continued) E 131 Corrupted control parameters (Verify configuration of system). Communi- Reconfigure the system. Replace control if heating cating only. or cooling is not available. Only applicable in the communicating mode, not in startup. Exit from Com- missioning and Execute ’Set Factory Default mode’.
  • Page 51 Integrated Control Diagnostic Codes (continued) Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E 223 Low pressure switch failed open. Check pressure (inches w.c.) of low pressure switch closing on heat call. Measure operating pressure (inches w.c.). Inspect vent and combustion air in- ducer for correct operation and restriction.
  • Page 52 Integrated Control Diagnostic Codes (continued) E 272 Soft lockout − Exceeded maximum number of recycles. Last recycle due Check operation of low pressure switch to see if it is to the pressure switch opening. stuck closed on heat call. Check pressure (inches w.c.) of high pressure switch closing on heat call.
  • Page 53 Integrated Control Diagnostic Codes (continued) Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E 312 Restricted air flow in cooling or continuous fan mode is lower than cfm Warning Only. Restricted airflow − Indoor blower is setting. running at a reduced CFM (Cutback Mode −...
  • Page 54 Integrated Control Diagnostic Codes (continued) E 406 LSOM − Compressor open start circuit. Required amount of current is not passing through Start current transformer. Clears the error after cur- rent is sensed in START sensor, or after power re- set. E 407 LSOM −...

  • Page 55: Program Unit Capacity/Size Mode

    Program Unit Capacity/Size Mode − − 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 56: Troubleshooting

    Troubleshooting: Heating Sequence of Operation 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 SWITCH WATCHGUARD − INDOOR AFTER HEAT FAN LIMIT SWITCH CODE CLOSED WITHIN 3...
  • Page 57 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? ONLY FOR 1ST EXPIRED? REQUEST FOR 2ND STAGE HEAT INDUCER SWITCHED TO HIGH SPEED HIGH...
  • Page 58 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 59 Troubleshooting: Cooling Sequence of Operation (Continued) 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 60 Troubleshooting: Continuous Fan Sequence of Operation CALL FOR FAN CALL FOR FAN INDOOR BLOWER ON CONTINUOUS FAN SPEED CALL FOR FAN MAINTAIN INDOOR REMOVED? BLOWER AT CONTINUOUS FAN REQUEST MAINTAIN INDOOR FOR COOLING GO TO CALL FOR COOLING BLOWER AT RECEIVED? CONTINUOUS FAN REQUEST...

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