Lennox SL280UH090V48B - Manuals

Page 2 - FRONT VIEW; SUPPLY AIR; TOP VIEW; Side Return; SIDE VIEW

Page 2 Unit Dimensions − inches (mm) 1 NOTE − 60C and 60D units that require air volumes over 1800 cfm (850 L/s) must have one of the following:1. Return air from single side transition will accommodate 20 x 25 x1 in.(508 x 635 x 25) cleanable air filter. (Required to maintain proper airvelocity)2. ...

Page 3 - Parts Arrangement; FIGURE 1

Page 3 Parts Arrangement FIGURE 1 HEAT EXCHANGER CABINET COMBUSTION AIR INDUCER BLOWER ASSEMBLY BURNER BOX INNER BLOWER ACCESS PANEL ACCESS PANEL SIGHT GLASS COMBUSTION AIR INDUCER PRESSURE SWITCH GAS VALVE CONTROL BOX (Includes two−stage integrated control, transformer and circuit breaker) ROLLOUT ...

Page 4 - Shipping and Packing List; Package 1 of 1 contains; Safety Information; DANGER; WARNING; Certifications

Page 4 SL280UHV Gas Furnace The SL280UHV gas furnace is equipped with a two−stage,variable speed integrated control. the control is compat-ible with:Communicating thermostats − icomfort Touch ® . Non−comunicating thermostats − ComfortSense or otherconventional thermostats.Control systems − Harmony I...

Page 5 - Heating Unit Installed Upstream of Cooling Unit; Gas Unit; Use of Furnace as Construction Heater

Page 5 Temperature Rise NOTE − Furnace must be adjusted to obtain a temperaturerise(high and low fire) within the range(s) specified on the unitnameplate. Failure to do so may cause erratic limit operationand may result in premature heat exchanger failure. This SL280UHV furnace must be installed so ...

Page 6 - Product contains fiberglass wool.; CAUTION

Page 6 Place the furnace as close to the center of the air dis-tribution system as possible. The furnace should also belocated close to the chimney or vent termination point. Do not install the furnace where drafts might blow direct-ly into it. This could cause improper combustion and un-safe operat...

Page 7 - FIGURE 2

Page 7 Unconfined Space An unconfined space is an area such as a basement orlarge equipment room with a volume greater than 50 cubicfeet (1.42 m 3 ) per 1,000 Btu (.29 kW) per hour of the com- bined input rating of all appliances installed in that space.This space also includes adjacent rooms which ...

Page 8 - FIGURE 3; FIGURE 4; FIGURE 5

Page 8 EQUIPMENT IN CONFINED SPACE ALL AIR FROM OUTSIDE (Inlet Air from Crawlspace and Outlet Air to Ventilated Attic) NOTE−The inlet and outlet air openings shall each have a free area of at least one square inch (645 mm 2 ) per 4,000 Btu (1.17 kW) per hour of the total input rating of all equipmen...

Page 9 - Setting Equipment; The unit must be level.; Upflow Applications; Upflow Application Installation Clearances; FIGURE 7

Page 9 Setting Equipment WARNING Do not install the furnace on its front or its back. Donot connect the return air ducts to the back of the fur-nace. Doing so will adversely affect the operation ofthe safety control devices, which could result in per-sonal injury or death. The SL280UHV gas furnace c...

Page 10 - − Return air from single side with transition which will; Refer to Engineering Handbook for additional information.; Transition; Single Side Return Air; SIDE RETURN

Page 10 Return Air −− Upflow Applications Return air can be brought in through the bottom or eitherside of the furnace installed in an upflow application. If thefurnace is installed on a platform with bottom return, makean airtight seal between the bottom of the furnace and theplatform to ensure tha...

Page 11 - Horizontal Applications

Page 11 Removing the Bottom Panel Remove the two screws that secure the bottom cap to thefurnace. Pivot the bottom cap down to release the bottompanel. Once the bottom panel has been removed, reinstallthe bottom cap. See figure 10. Removing the Bottom Panel FIGURE 10 Screw Bottom Panel Bottom Cap Ho...

Page 12 - Filters; TABLE 1; Duct System; Supply Air Plenum

Page 12 Horizontal Application Unit Installed on Platform FIGURE 13 clearances. GAS ENTRY VENT PIPE See the unit nameplate for Line contact is permissible SERVICE PLATFORM WARNING Improper installation of the furnace can result in per-sonal injury or death. Combustion and flue productsmust never be ...

Page 13 - Venting; Mounting Screws Location; UPFlow Position; Top Vent Discharge; IMPORTANT; − Remove the four mounting screws (figure 14) which; Left Side Vent Discharge; UPFLOW POSITION; Right Side Vent Discharge

Page 13 Venting A 4−inch diameter flue transition is factory-installed on thecombustion air inducer outlet of all models. Figure 15 shows the combustion air inducer as shipped from thefactory. FIGURE 14 Mounting Screws Location mounting screws mounting screw UPFlow Position FIGURE 15 UPFLOW POSITION...

Page 14 - Horizontal Position; HORIZONTAL LEFT POSITION; Side Vent Discharge; HORIZONTAL RIGHT POSITION

Page 14 Horizontal Position FIGURE 18 HORIZONTAL LEFT POSITION Top Vent Discharge Disconnect pressure switch hose from barbed fitting on the pres- sure switch assembly. Remove pressure switch assembly (1screw) and cut wire tie to free pressure switch wires. Re−installpressure switch on the other sid...

Page 15 - VENT CONNECTION; Venting Using a Masonry Chimney; Common Venting Using Metal−Lined Masonry Chimney

Page 15 The SL280UHV series units are classified as fan−assistedCategory I furnaces when vertically vented according tothe latest edition of National Fuel Gas Code (NFPA 54 /ANSI Z223.1) in the USA. A fan−assisted Category I fur-nace is an appliance equipped with an integral mechanicalmeans to eithe...

Page 16 - General Venting Requirements

Page 16 FIGURE 24 Common Venting Using Tile−Lined Interior Masonry Chimney and Combined Vent Connector MINIMUM LENGTH = AS SHORT AS PRACTICAL. FOR MAXIMUM LENGTH SEE NOTE TO LEFT INTERIOR TILE−LINEDMASONRY CHIMNEY NOTE − the chimney must be properlysized per provided venting tables orlined with list...

Page 17 - TABLE 2; Connector Diameter

Page 17 6 − The entire length of single wall metal vent connector shall be readily accessible for inspection, cleaning,and replacement. 7 − Single appliance venting configurations with zero lat- eral lengths (tables 3 and 4) are assumed to have noelbows in the vent system. For all other vent configu...

Page 23 - Gas Piping; Gas Supply; TABLE 9; NOTE − Capacity given in cubic feet (m

Page 23 Gas Piping CAUTION If a flexible gas connector is required or allowed bythe authority that has jurisdiction, black iron pipeshall be installed at the gas valve and extend outsidethe furnace cabinet. The flexible connector can thenbe added between the black iron pipe and the gassupply line. G...

Page 24 - Horizontal Application; Leak Check; less than or equal to

Page 24 GROUND JOINT UNION AUTOMATIC GAS VALVE FIELD PROVIDED AND INSTALLED GROUND JOINT UNION Left Side Piping (Standard) Right Side Piping (Alternate) AUTOMATIC GAS VALVE DRIP LEG DRIP LEG MANUAL MAIN SHUT−OFF VALVE (With 1/8 in. NPT Plugged Tap Shown) MANUAL MAIN SHUT−OFF VALVE (With 1/8 in. NPT ...

Page 25 - Electrical; Precautions and Procedures; NOTE −

Page 25 Electrical ELECTROSTATIC DISCHARGE (ESD) Precautions and Procedures CAUTION Electrostatic discharge can affect elec-tronic components. Take precautions toneutralize electrostatic charge bytouching your hand and tools to metalprior to handling the control. The unit is equipped with a field ma...

Page 26 - Thermostat Selection; Indoor Blower Speeds; Non−Communicating; thermostat, proper indoor blower speed selec-

Page 26 8 − An unpowered, normally open (dry) set of contacts with a 1/4" spade terminal HUM" are provided for humidifi-er connections and may be connected to 24V or 120V.Any humidifier rated up to one amp can be connectedto these terminals. In 120V humidifier applications theneutral leg of ...

Page 29 - DIP Switch Settings and On−Board Links (See figure 34); ON

Page 29 TABLE 11 SL280 Field Wiring Applications With Conventional Thermostat Thermostat DIP Switch Settings and On−Board Links (See figure 34) Wiring Connections DIP Switch 1 Thermostat Heating Stages On Board Links Must Be Cut To Select System Options 1 Heat / 1 Cool NOTE − Use DIPswitch 2 to sets...

Page 30 - OFF

Page 30 TABLE 11 SL280 Field Wiring Applications With Conventional Thermostat (Continued) Thermostat DIP Switch Settings and On−Board Links (See figure 34) Wiring Connections DIP Switch 1 Thermostat Heating Stages On Board Links Must Be Cut To Select System Options 2 Heat / 2 Cool OFF CUT ON−BOARD L...

Page 33 - SL280UHV Schematic Wiring Diagram

Page 33 SL280UHV Schematic Wiring Diagram FIGURE 32

Page 34 - TYPICAL SL280UHV FIELD WIRING DIAGRAM

Page 34 TYPICAL SL280UHV FIELD WIRING DIAGRAM FIGURE 33 FIELD INSTALLED CLASS II 24V FIELD INSTALLED LINE VOLTAGE

Page 35 - Integrated Control

Page 35 Integrated Control FIGURE 34 THERMOSTAT CONNECTIONS (TB1) 1/4" QUICK CONNECT TERMINALS RS−BUS LINK (TB82, future use) I+ = DATA HIGH CONNECTIONI − = DATA LOW CONNECTION RS−BUS OUTDOOR (TB83) R = 24VACI + = DATA HIGH CONNECTIONI − = DATA LOW CONNECTIONC = 24VAXC COMMON RS−BUS INDOOR (TB84...

Page 38 - On−Board Links; In icomfort; On−Board Link W914 Dehum or Harmony (R to DS)

Page 38 On−Board Links Note: In icomfort systems with a conventional outdoor unit (non−communicating), the on−board clippable linksmust be set to properly configure the system. WARNING Carefully review all configuration information pro-vided. Failure to properly set DIP switches, jumpersand on−board...

Page 39 - BLOWER DATA; HEATING

Page 39 BLOWER DATA SL280UH070V36A BLOWER PERFORMANCE (less filter)BOTTOM RETURN AIR0 through 0.8 in. w.g. (Heating) and 0 through 1.0 in. w.g. (Cooling) External Static Pressure Range HEATING 1 Heating Speed DIP Switch Settings First Stage Heating Speed - cfm Second Stage Heating Speed - cfm +24% 1...

Page 49 - OPERATING SEQUENCE; NO CALL FOR DEHUMIDIFICATION

Page 49 TABLE 18 OPERATING SEQUENCE SL280UHV, Non−Communicating Thermostat with Humidity Control Feature and Single−Speed Outdoor Unit OPERATING SEQUENCE SYSTEM DEMAND SYSTEM RESPONSE System Condition Step Thermostat Demand Relative Humidity Compres- sor Blower CFM (COOL) Comments Y1 O G W 1 Status ...

Page 51 - Unit Start−Up

Page 51 Unit Start−Up FOR YOUR SAFETY READ BEFORE LIGHTING WARNING Do not use this furnace if any part has been underwa-ter. Immediately call a licensed professional servicetechnician (or equivalent) to inspect the furnace andto replace any part of the control system and any gascontrol which has bee...

Page 52 - Gas Pressure Adjustment; White Rodgers Gas Valve; Do not adjust low fire man-; Proper Combustion; ALL

Page 52 12− If the appliance will not operate, follow the instructions Turning Off Gas to Unit" and call your service techni-cian or gas supplier. Turning Off Gas to Unit 1 − Set the thermostat to the lowest setting. 2 − Turn off all electrical power to the unit if service is to be performed. 3 ...

Page 53 - High Altitude; Manifold Pressure Settings; Natural; High Altitude Pressure Switch Kits

Page 53 High Altitude The manifold pressure, gas orifice and pressure switchmay require adjustment or replacement to ensure properoperation at higher altitudes. Tables 22 through 25 showsmanifold pressure, pressures switch and gas conversionkits at all altitudes. IMPORTANT For safety, shut unit off ...

Page 55 - HEATING OPERATION WITH TWO−STAGE THERMOSTAT; HEATING OPERATION WITH SINGLE STAGE THERMOSTAT

Page 55 Applications Using A Single−Stage Thermostat See figure 38 for ignition control sequence B − Heating Sequence −− Integrated Control ThermostatSelection DIP Switch 1 ON in Single−Stage" Position NOTE − In these applications, two−stage heat will be initi-ated by the integrated control if h...

Page 56 - Service; Blower

Page 56 Service WARNING ELECTRICAL SHOCK, FIRE, OR EXPLOSION HAZARD. Failure to follow safety warnings exactly could resultin dangerous operation, serious injury, death orproperty damage.Improper servicing could result in dangerous opera-tion, serious injury, death, or property damage.Before servici...

Page 58 - Remove 5 screws if necessary

Page 58 SL280UHV NOX INSERTS FIGURE 40 FIGURE 41 Remove 5 screws if necessary (either side of cabinet) 1 2 3 4 5 18− Reconnect all wires. 19− Reconnect top cap and vent pipe to combustion air in- ducer outlet. 20− Reconnect gas supply piping. 21− Turn on power and gas supply to unit. 22− Set thermos...

Page 60 - dF

Page 60 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 (U...

Page 61 - Integrated Control Diagnostic Codes (continued)

Page 61 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-nicationsystem). Equipment is unable to communicate. Indicatesnumerous message errors. In most...

Page 66 - LSOM − Compressor open start circuit.

Page 66 Integrated Control Diagnostic Codes (continued) E 406 LSOM − Compressor open start circuit. Required amount of current is not passing throughStart current transformer. Clears the error after cur-rent is sensed in START sensor, or after power re-set. E 407 LSOM − Compressor open run circuit. ...

Page 67 - Program Unit Capacity/Size Mode; FINISHED

Page 67 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, furnacecontrol does not recognize unit size code. Configure per the following: Furnace...

Page 68 - Troubleshooting: Heating Sequence of Operation

Page 68 Troubleshooting: Heating Sequence of Operation HIGH LIMIT SWITCH CLOSED? LOW PRESSURE SWITCH OPEN? INDUCER ON PRE − PURGE (15 SECONDS) 1ST STAGE GAS VALVE ENERGIZED FLAME SENSED WITHIN 4 SECONDS? (LOW HEAT SPEED) HEAT FAN OFF DELAY (LOW HEAT SPEED) AFTER HEAT FAN OFF DELAY (LOW HEAT SPEED) Y...

Page 72 - Troubleshooting: Continuous Fan Sequence of Operation

Page 72 Troubleshooting: Continuous Fan Sequence of Operation CALL FOR FAN CALL FOR FAN REMOVED? YES NO NO REQUEST FOR HEAT RECEIVED? REQUEST FOR COOLING RECEIVED? GO TO CALL FOR 1ST STAGE HEAT YES GO TO CALL FOR COOLING 1 1 1 4 YES NO CALL FOR FAN INDOOR BLOWER ON CONTINUOUS FAN SPEED MAINTAIN INDO...