Lennox SL280UH090V36B Installation Instructions Manual
Sl280uhv series
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© 2017 Lennox Industries Inc.
Dallas, Texas USA
AIR FLOW
HORIZONTAL LEFT
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.
Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Parts Arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
SL280UHV Gas Furnace . . . . . . . . . . . . . . . . . . . . . . . . . 4
Shipping and Packing List . . . . . . . . . . . . . . . . . . . . . . . . 4
Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Use of Furnace as a Construction Heater . . . . . . . . . . . 5
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Combustion, Dilution & Ventilation Air . . . . . . . . . . . . . . 6
Setting Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Duct System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
UPFLOW
AIR FLOW
AIR FLOW
HORIZONTAL RIGHT
Table of Contents
INSTALLATION
INSTRUCTIONS
SL280UHV
507337-01
04/2017
Supersedes 05/2016
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.
• The Lennox icomfort Wi-Fi® 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 25.
Integrated Control Settings . . . . . . . . . . . . . . . . . . . . . . . 33
Blower Performance Data . . . . . . . . . . . . . . . . . . . . . . . . 36
Unit Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Gas Pressure Adjustment . . . . . . . . . . . . . . . . . . . . . . . . 42
Proper Combustion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
High Altitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Other Unit Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Heating Sequence of Operation . . . . . . . . . . . . . . . . . . . 44
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Repair Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Integrated Control Diagnostic Codes . . . . . . . . . . . . . . . 49
Program Unit Capacity/Size Mode . . . . . . . . . . . . . . . . . 55
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Page 1
CAUTION
NOTICE
both
communicating
and
non-
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Table of Contents
Related Manuals for Lennox SL280UH090V36B
Summary of Contents for Lennox SL280UH090V36B
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Page 1: Table Of Contents
UPFLOW NOTICE AIR FLOW A thermostat is not included and must be ordered separately. • The Lennox icomfort Wi-Fi® thermostat must be used in communicating applications. • In non-communicating applications, the Lennox AIR FLOW AIR FLOW HORIZONTAL LEFT HORIZONTAL RIGHT ComfortSense®... -
Page 2: Unit Dimensions
1-15/16 (49) (16) 3-1/4 23-1/2 (83) (19) (19) (597) Bottom Return Bottom Return Air Opening Air Opening FRONT VIEW SIDE VIEW Model No. SL280UH070V36A 13-3/8 4-3/4 SL280UH090V36B 17-1/2 16-3/8 6-1/4 SL280UH090V48B SL280UH09060C 19-7/8 19-1/2 SL280UH110V60C 24-1/2 23-3/8 9-3/4 SL280135V60D Page 2... -
Page 3: Parts Arrangement
Parts Arrangement HEAT EXCHANGER COMBUSTION AIR INDUCER COMBUSTION AIR INDUCER PRESSURE SWITCH GAS VALVE CABINET BURNER BOX INNER BLOWER ACCESS PANEL CONTROL BOX (Includes two-stage integrated control, SIGHT GLASS transformer and circuit breaker) ACCESS PANEL BLOWER ASSEMBLY FIGURE 1 Page 3... -
Page 4: Sl280Uhv Gas Furnace
CAUTION SL280UHV Gas Furnace The SL280UHV gas furnace is equipped with a two-stage, As with any mechanical equipment, contact with sharp variable speed integrated control. the control is compati- sheet metal edges can result in personal injury. Take ble with: care while handling this equipment and wear gloves and Communicating thermostats - icomfort Wi-Fi®. -
Page 5: Use Of Furnace As A Construction Heater
Use of Furnace as Construction Heater Lennox does not recommend the use of SL280UHV units as a construction heater during any phase of construc- tion. Very low return air temperatures, harmful vapors and... -
Page 6: Combustion, Dilution & Ventilation Air
• Do not block the furnace combustion air openings with CAUTION clothing, boxes, doors, etc. Air is needed for proper combustion and safe unit operation. Do not install the furnace in a corrosive or contaminated atmosphere. Meet all combustion and ventilation air •... - Page 7 Unconfined Space Air from Inside An unconfined space is an area such as a basement or If the confined space that houses the furnace adjoins a large equipment room with a volume greater than 50 cubic space categorized as unconfined, air can be brought in by feet (1.42 m3) per 1,000 Btu (.29 kW) per hour of the com- providing two permanent openings between the two spac- bined input rating of all appliances installed in that 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.
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Page 9: Setting Equipment
Upflow Applications Setting Equipment Allow for clearances to combustible materials as indicated WARNING on the unit nameplate. Minimum clearances for closet or alcove installations are shown in figure 8. Do not install the furnace on its front or its back. Do not Upflow Application Installation Clearances connect the return air ducts to the back of the furnace. -
Page 10: Return Air
Return Air -- Upflow Applications Single Side Return Air Return air can be brought in through the bottom or either (with transition and filter) side of the furnace installed in an upflow application. If the furnace is installed on a platform with bottom return, make an airtight seal between the bottom of the furnace and the platform to ensure that the furnace operates properly and safely. - Page 11 Pivot the bottom cap down to release the bottom plications. Order kit number 51W10 (or use equivalent) panel. Once the bottom panel has been removed, reinstall from Lennox. the bottom cap. See figure 11. Allow for clearances to combustible materials as indicated on the unit nameplate.
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Page 12: Filters
Before using any filter with this system, check the specifications provided by the filter manufacturer against the data given in the appropriate Lennox Product Specifications bulletin. Additional information is provided in Service and Application Note ACC002 (August 2000). -
Page 13: Venting
reverse flow of the flue gas may result in incomplete com- 2 - Use tin snips to cut preferred opening on the bustion and the formation of carbon monoxide gas. This cabine for repositioning the flue outlet. Use the cut toxic gas might then be distributed throughout the house out piece as a cover plate to patch unused opening by the furnace duct system. - Page 14 UPFLOW POSITION HORIZONTAL LEFT POSITION Right Side Vent Discharge Side Vent Discharge cover plate pressure switch flue transition collector box vent pipe pressure switch FLOW make-up flue transition collector box make-up box FLOW Disconnect pressure switch hose from barbed fitting on the Pressure switch tubing may be too long.
- Page 15 HORIZONTAL RIGHT POSITION VENT CONNECTION “DISCONNECTED VENT” Side Vent Discharge WARNING STICKER pressure switch VENT PIPE (min. 6” length) FLUE TRANSITION FLOW COLLAR flue transition collector box FIGURE 23 Use self-drilling sheet metal screws or a mechanical fas- make up box tener to firmly secure the vent pipe to the round collar of the flue transition.
- Page 16 Common Venting Using Metal-Lined Masonry Chimney IMPORTANT SEALED SINGLE appliance venting of a fan-assisted furnace into MAX. LENGTH -- SEE NOTE 1 a tile-lined masonry chimney (interior or outside wall) BELOW. 5 ft. (1.5 m) is PROHIBITED. The chimney must first be lined with MIN.
- Page 17 A type B1 vent or masonry chimney liner shall terminate 7 - Single appliance venting configurations with zero above the roof surface with a listed cap or a listed roof as- lateral lengths (table 3) are assumed to have sembly according to the terms of their respective listings no elbows in the vent system.
- Page 18 14 - All venting pipe passing through floors, walls, and 18 - The common vent diameter must always be at least ceilings must be installed with the listed clearance as large as the largest vent connector diameter. to combustible materials and be fire stopped 19 - In no case, shall the vent connector be sized more according to local codes.
- Page 19 TABLE 4 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 20 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 21: Gas Piping
3 - The gas piping must not run in or through air ducts, Gas Piping clothes chutes, gas vents or chimneys, dumb waiters, or elevator shafts. CAUTION 4 - The piping should be sloped 1/4 inch (6.4 mm) per 15 feet (4.57 m) upward toward the meter from the If a flexible gas connector is required or allowed by furnace. - Page 22 Left Side Piping MANUAL (Standard) MAIN SHUT-OFF AUTOMATIC MANUAL VALVE GAS VALVE MAIN SHUT-OFF (With 1/8 in. NPT AUTOMATIC VALVE Plugged Tap GAS VALVE (With 1/8 in. NPT Shown) Plugged Tap Shown) GROUND JOINT UNION GROUND JOINT UNION DRIP LEG Right Side Piping FIELD (Alternate)
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Page 23: Electrical
CAUTION Electrical WARNING Failure to use properly sized wiring and circuit breaker may result in property damage. Size wiring and circuit Electrostatic discharge can affect breaker(s) per Product Specifications bulletin (EHB) and electronic components. Take care unit rating plate. during unit installation and service to NOTE - Unit nameplate states maximum current draw. - Page 24 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 high quality electronic digital thermostat or any other with the first stage and second stage cooling speed set using the icomfort Wi-Fi®...
- Page 25 ® ® ® iComfort Thermostat with a iComforti Thermostat with an iComfort Non-Communicating Outdoor Unit ENABLED Outdoor Unit ® iComforti Thermostat ® icomfort Thermostat ® iComfort -Enabled Indoor Furnace ® iComfort Enabled Indoor Furnace Non-Communicating Outdoor Air Conditioner ® iComfort Enabled Outdoor Air Conditioner or Heat Pump ®...
- Page 26 “HUM” CONTACT IS OPTIONAL OUTDOOR AIR SENSOR FOR USE WITH HUMIDIFIER (IF CLOSED ANYTIME NOT ALREADY IN THE SYSTEM FOR OTHER FUNCTIONS. BUILT INTO HUMIDITY DEMAND IS PRESENT ALL icomfort® by Lennox® OUTDOOR UNITS). ® iComfort ENABLED 24V HUMIDIFIER CONNECTIONS FURNACE...
- Page 27 TABLE 8 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.
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Page 28: Wiring Connections
Table 8 SL280 Field Wiring Applications With Conventional Thermostat (Continued) 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... - Page 29 TABLE 8 SL280 Field Wiring Applications With Conventional Thermostat (Continued) DIP Switch Settings and On-Board Links DIP Switch 1 On Board Links Must Be Cut To Select Wiring Connections Thermostat Thermostat Heating System Options Stages Dual Fuel FURNACE HEAT PUMP T'STAT TERM.
- Page 30 TABLE 8 SL280 Field Wiring Applications With Conventional Thermostat (Continued) 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 T'STAT TERM.
- Page 31 SL280UHV Schematic Wiring Diagram FIGURE 32 Page 31...
- Page 32 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...
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Page 33: Integrated Control Settings
TABLE 9 Integrated Control DIP Switch Settings - Blower Off Delay Switch Settings Conventional Thermostat (non-communicating) Blower Off Delay SL280UHV 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 34 TABLE 12 Ramping Option D Cooling Mode Blower Speed Ramping • Motor runs at 100% until demand is satisfied. Ramping Switch 9 Switch 10 • Once demand is met, motor ramps down to stop. A (Factory) 100% CFM COMPRESSOR DEMAND Switches 11, 12 and 13 -- Heating Mode Blower Speed The switches are factory set to the OFF position which provides factory default heat speed.
- Page 35 On-Board Link W915 2 Stage Compr (Y1 to Y2) On-Board Links On-board link W915 is a clippable connection between Note: In icomfort systems with a conventional outdoor unit terminals Y1 and Y2 on the integrated control. W915 must (non-communicating), the on-board clippable links must be cut if two-stage cooling will be used.
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Page 36: Blower Performance Data
1005 1114 1260 – 1144 BLOWER DATA SL280UH090V36B BLOWER PERFORMANCE (less filter) BOTTOM RETURN AIR 0 through 0.8 in. w.g. (Heating) and 0 through 1.0 in. w.g. (Cooling) External Static Pressure Range HEATING Heating Speed DIP Switch First Stage Heating Speed - cfm... - Page 37 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%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 450 cfm. Lennox iHarmony Zoning System Applications - Minimum blower speed is 450 cfm.
- Page 38 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%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 450 cfm. Lennox iHarmony Zoning System Applications - Minimum blower speed is 450 cfm.
- Page 39 - Cut 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® 7000 thermostat to use for this application - Y2081 4 heat / 2 cool *Dehumidification blower speed is 70% of COOL speed for all units .
- Page 40 With Heat Pump - Cut W914 (R to DS) & W951 (R to O) on SureLight® control Dave Lennox ComfortSense® 7000 thermostat to use for this application - Y2081 4 heat / 2 cool *Normal operation first stage cooling blower speed is 70% COOL speed.
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Page 41: Unit Start-Up
2 - Set the thermostat to the lowest setting. Unit Star-Up 3 - Turn off all electrical power to the unit. WARNING 4 - This furnace is equipped with an ignition device which automatically lights the burners. Do not try to Do not use this furnace if any part has been underwater. -
Page 42: Gas Pressure Adjustment
NOTE - Pressure test adapter kit (10L34) is available from 2 - Are access panels securely in place? Lennox to facilitate manifold pressure measurement. 3 - Is the main disconnect switch closed? 1 - Connect test gauge to manifold pressure post 4 - Is there a blown fuse or tripped circuit breaker? (figure 34) or tap (figure 35) on gas valve. -
Page 43: High Altitude
High Altitude The manifold pressure, gas orifice and pressure switch may require adjustment or replacement to ensure proper operation at higher altitudes. Tables 19 through 22 shows manifold pressure, pressures switch and gas conversion kits at all altitudes. TABLE 19 Manifold Pressure Settings Manifold Manifold... -
Page 44: Other Unit Adjustments
Applications Using Two-Stage Thermostat Other Unit Adjustments See figure 36 for ignition control sequence Primary and Secondary Limits A - Heating Sequence Integrated Control Thermostat The primary limit is located on the heating compartment Selection DIP Switch 1 OFF in “Two-Stage”Position vestibule panel. - Page 45 4 - After the 20-second warm-up period has ended, the Applications Using Single-Stage Thermostat gas valve is energized on low fire (first stage) and See figure 37 for ignition control sequence ignition occurs. At the same time, the control module B - Heating Sequence -- Integrated Control Thermostat sends a signal to begin an indoor blower 30-second Selection DIP Switch 1 ON in “Single-Stage”...
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Page 46: Service
At the beginning of each heating season, and to comply off operation. with the Lennox Limited Warranty, your system should be 1 - Check the operation of the ignition system, inspect checked by a licensed professional technician (or equiva- and clean flame sensor. - Page 47 Cleaning the Burners 4 - To clean burners, run a vacuum cleaner with a soft brush attachment over the face of burners. Visually NOTE - Use papers or protective covering in front of the inspect inside the burners and crossovers for any furnace during cleaning.
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Page 48: Repair Parts List
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: SL280UH070V36A. All service must be performed by a licensed professional installer (or equivalent), service agency, or gas supplier. -
Page 49: Integrated Control Diagnostic Codes
Integrated Control Diagnostic Modes Display Action (when button is 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 “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 50 Integrated Control Diagnostic Modes 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 51 Integrated Control Diagnostic Modes 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 52 Integrated Control Diagnostic Modes 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 53 Integrated Control Diagnostic Modes 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 54 Integrated Control Diagnostic Modes 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”...
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Page 55: Program Unit Capacity/Size Mode
UNIT SIZE UNIT SIZE IMPORTANT: Field replacement controls may CODE CODE FURNACE MODEL FURNACE MODEL need to be manually configured to validate SL280UH070V36A SL280DF070V36A furnace unit size code. SL280UH090V36B SL280DF090V48B SL280UH090V48B SL280DF090V60C SL280UH090V60C SL280DF110V60C SL280UH110V60C SL280UH135V60D Solid starts blinking 7-Segment LED When the correct unit size code is displayed, release button. -
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 INDOOR WATCHGUARD − AFTER HEAT FAN LIMIT SWITCH CODE CLOSED WITHIN 3... - Page 57 Troubleshooting: Heating Sequence of Operation (Coninued) 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 58 Troubleshooting: Heating Sequence of Operation (Coninued) 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...
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Page 59: Call For Cooling
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 60 Troubleshooting: 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 INDOOR BLOWER OFF...
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Questions and answers
how to turn on pilot light
The Lennox SL280UH090V36B furnace has an automatic ignition system, so it does not have a pilot light that needs to be manually lit. To turn on the furnace:
1. Ensure the gas supply is on.
2. Restore electrical power to the furnace.
3. The automatic ignition system will ignite the burners when the thermostat calls for heat.
Do not attempt to manually light the burners.
This answer is automatically generated
Need to change filtee