Instruction/ maintenance manual of the product SL280UH090V48B Lennox International Inc.
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Page 1 06/1 1 *2P0611* 506763−01 *P506763-01* 201 1 Lennox Industries Inc. Dallas, T exas, USA UPFLOW HORIZONT AL LEFT HORIZONT AL RIGHT AIR FLOW AIR FLOW AIR FLOW W ARNING Improper inst allation, adjustment, alteration, service or maintenance can cause property damage, person- al injury or loss of life.
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 .
Page 3 Part s Arrangement FIGURE 1 HEA T EXCHANGER CABINET COMBUSTION AIR INDUCER BLOWER ASSEMBL Y BURNER BOX INNER BLOWER ACCESS P ANEL ACCESS P ANEL SIGHT GLASS COMBUSTION AIR INDUCER PRESSURE SWITC.
Page 4 SL280UHV Gas Furnace The S L280UHV gas f urnace i s equipped with a t wo−stage, variable speed integrated control. the control is compat - ible with: Communicating thermostat s − icomfort T ouch ® . Non−comunicating thermostat s − ComfortSense or other conventional thermostat s.
Page 5 T emperature Rise NOTE − Furnace must be adjusted to obtain a temperature rise(high a nd l ow f ire) within the r ange(s) s pecified o n the unit nameplate. Failure to d o so m ay cause erratic limit o peration and may result in premature heat exchanger failure.
Page 6 Place the furnace as close to the center of the air dis- tribution system as possible. The furnace should also be located close to the chimney or vent termination point. Do not install the f urnace where drafts might blow direct- ly into it.
Page 7 Unconfined Sp ace An unconfined space is an area such as a basement or large equipment room with a volume greater than 50 cubic feet (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.
Page 8 EQUIPMENT IN CONFINED SP ACE ALL AIR FROM OUTSIDE (Inlet Air from Crawlspace and Outlet Air to V entilated 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 tot al input rating of all equipment in the enclosure.
Page 9 Setting Equipment W ARNING Do not inst all the furnace on its front or it s back. Do no t connect the return ai r ducts to the back of the fur- nace. Doing so will adversely affect the operation of the safety control devices, which could result in per- sonal injury or death.
Page 10 Return Air −− Up flow Applications Return air can be brought in through the b ottom or either side o f the furnace installed in an upflow a pplication.
Page 1 1 Removing the Bottom Panel Remov e the two screws that secure the bottom cap to the furnace. Pivot the bottom cap down to release the bottom panel.
Page 12 Horizontal Application Unit Installed on Plat form FIGURE 13 clearances. GAS ENTRY VENT PIPE See the unit nameplate for Line contact is permissible SERVICE PLA TFORM W ARNING Improper inst allation of the f urnace can result in per- sonal injury or death.
Page 13 V enting A 4−inch diameter flue transition is factory-installed on the combustion air inducer outlet of all models. Figure 15 shows the combustion air inducer as shipped from the factory .
Page 14 Horizontal Position FIGURE 18 HORIZONT AL LEFT POSITION T op V ent Discharge Disconnect pressure switch hose from barbed fitting on the pres- sure switch assembly . Remove pressure switch assembly (1 screw) and cut wire tie to free pressure switch wires.
Page 15 The SL280UHV series units are classified as fan−assisted Category I furnaces when vertically vented according to the latest edition of National Fuel Gas Code (NFP A 54 / ANSI Z223.
Page 16 FIGURE 24 Common V enting Using Tile−Lined Interior Masonry Chimney and Combined V ent Connector MINIMUM LENGTH = AS SHORT AS PRACTICAL. FOR MAXIMUM LENGTH SEE NOTE TO LEFT INTERIOR TILE−LINED MASONRY CHIMNEY NOTE − the chimney must be properly sized per provided venting tables or lined with listed metal lining system.
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 no elbows in the vent system.
Page 18 T ABLE 3 Cap acity of T ype B Double−Wall V ent s with T ype B Double−Wall Connectors Serving a Single Category I Appliance Height H (feet) Lateral L (feet) V ent and Connector Diameter .
Page 19 T ABLE 4 Cap acity of T ype B Double−Wall V ent s with Single−Wall Met al Connectors Serving a Single Category I Appliance Height H (feet) Lateral L (feet) V ent and Connector Diameter −.
Page 20 T ABLE 5 V ent Connector Capacity T ype B Double−W all V ent s with T ype B Double−Wall Connectors Serving T wo or More Category I Appliances V ent Height H (feet) Connector Rise R (feet) .
Page 21 T ABLE 7 V ent Connector Capacity T ype B Double−W all V ent s with Single−Wall Met al Connectors Serving T wo or More Category I Appliances Height H (feet) Lateral L (feet) V ent and Conn.
Page 22 Removal of the Furnace from Common V ent In the event that an existing furnace is removed from a venting system commonly run with separate gas ap- pliances, the venting system is likely to be too large to properly vent the remaining attached appliances.
Page 23 Gas Piping CAUTION If a flexible gas connector is required or allowed by the authority that has jurisdiction, black iron pipe shall be in st alled at the gas valve and extend out side the furnace cabinet. The flexible connector can then be added between the black iron pipe and the gas supply line.
Page 24 GROUND JOINT UNION AUTOMA TIC GAS V AL VE FIELD PROVIDED AND INST ALLED GROUND JOINT UNION Lef t Side Piping (St andard) Right Side Piping (Alternate) AUTOMA TIC GAS V AL VE DRIP LEG DRIP LEG MANUAL MAIN SHUT−OFF VA LV E (With 1/8 in. NPT Plugged T ap Shown) MANUAL MAIN SHUT−OFF VA LV E (With 1/8 in.
Page 25 Electrical ELECTROST A TIC DISCHARGE (ESD) Precautions and Procedures CAUTION Electrost atic discharge can affect elec- tronic component s. T ake precautions to neutralize electrost atic charge by touching your hand and tools to metal prior to handling the control.
Page 26 8 − An unpowered, normally open (dry) set of contac ts with a 1/4" spade terminal HUM" are provided for humidifi- er connections and may be connect ed to 24V or 120V . Any humidifier rated up to one amp can be connected to these terminals.
Page 27 FIGURE 30 icomfort T ouch ® Thermost at with SL280UHV and Non−Communicating Out door Unit icomfort − ENABLED SL280UHV FURNACE icomfort T ouch® THERMOST A T NON−COMMUNICA TING OUTDO.
Page 28 Optional Accessories for use with any icomfort T ouch ® System FIGURE 31 NOTE: 24V UV LIGHT APPLICA TIONS In an icomfort by Lennox system, neither furnace nor air handler trans- former will have adequate V A to power 24V UV light applications.
Page 29 T ABLE 1 1 SL280 Field Wiring Applications With Conventional Thermost at Thermost at DIP Switch Settings and On−Board Links (See figure 34) Wiring Connections DIP Switch 1 Thermost at Heating St ages On Board Links Must Be Cut T o Select System Options 1 Heat / 1 Cool NO TE − Use DI P switch 2 to set second−stage heat ON delay .
Page 30 T ABLE 1 1 SL280 Field Wiring Applications With Conventional Thermost at (Continued) Thermost at DIP Switch Settings and On−Board Links (See figure 34) Wiring Connections DIP Switch 1 Thermo.
Page 31 T ABLE 1 1 SL280 Field Wiring Applications With Conventional Thermost at (Continued) Thermost at DIP Switch Settings and On−Board Links (figure 34) Wiring Connections DIP Switch 1 Thermost a.
Page 32 T ABLE 1 1 SL280 Field Wiring Applications With Conventional Thermost at (Continued) Thermost at DIP Switch Settings and On−Board Links (figure 34) Wiring Connections DIP Switch 1 Thermost a.
Page 33 SL280UHV Schematic Wiring Diagram FIGURE 32.
Page 34 TYPICAL SL280UHV FIELD WIRING DIAGRAM FIGURE 33 FIELD INST ALLED CLASS II 24V FIELD INST ALLED LINE VOL T AGE.
Page 35 Integrated Control FIGURE 34 THERMOST A T CONNECTIONS (TB1) 1/4" QUICK CONNECT TERMINALS RS−BUS LINK (TB82, future use) I+ = DA T A HIGH CONNECTION I − = DA T A LOW CONNECTION RS−BU.
Page 36 Integrated Control DIP Switch Settings − Conventional Thermost at (non−communi- cating) SL280UHV units are equipped with a two−st age, variable 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 switches and jumpers.
Page 37 T ABLE 15 Cooling Mode Blower Speed Ramping Ramping Option Switch 9 Switch 10 A (Factory) Off Of f B Off On C On Off D On On Ramping Option A (Factory Selection) Motor runs at 50% for 30 seconds. Motor then runs at 82% for approximately 7−1/2 minu- tes.
Page 38 On−Board Links Note: In icomfort systems with a conventional outdoor unit (non−communicating), the on−board clippable links must be set to properly configure the system. W ARNING Carefully review all configuration information pro- vided.
Page 39 BLO WER D A T A SL280UH070V36A BLOWER PERFORMANCE (less lter) BOTTOM RETURN AIR 0 through 0.8 in. w .g. (Heating) and 0 through 1.0 in. w.g.
Page 40 BLO WER D A T A SL280UH090V36B BLOWER PERFORMANCE (less lter) BOTTOM RETURN AIR 0 through 0.8 in. w .g. (Heating) and 0 through 1.0 in. w.g.
Page 41 BLO WER D A T A SL280UH090V48B BLOWER PERFORMANCE (less lter) BOTTOM RETURN AIR 0 through 0.8 in. w .g. (Heating) and 0 through 1.0 in. w.g.
Page 42 BLO WER D A T A SL280UH090V48B BLOWER PERFORMANCE (less lter) SIDE RETURN AIR WITH OPTIONAL RETURN AIR BASE 0 through 0.8 in. w .g. (Heating) and 0 through 1.
Page 43 BLO WER D A T A SL280UH090V60C BLOWER PERFORMANCE (less lter) BOTTOM RETURN AIR, RETURN AIR FROM BOTH SIDES OR RETURN AIR FROM BOTT OM AND ONE SIDE 0 through 0.
Page 44 BLO WER D A T A SL280UH090V60C BLOWER PERFORMANCE (less lter) SIDE RETURN AIR WITH OPTIONAL RETURN AIR BASE 0 through 0.8 in. w .g. (Heating) and 0 through 1.
Page 45 BLO WER D A T A SL280UH1 10V60C BLOWER PERFORMANCE (less lter) BOTTOM RETURN AIR, RETURN AIR FROM BOTH SIDES OR RETURN AIR FROM BOTT OM AND ONE SIDE 0 through 0.
Page 46 BLO WER D A T A SL280UH1 10V60C BLOWER PERFORMANCE (less lter) SIDE RETURN AIR WITH OPTIONAL RETURN AIR BASE 0 through 0.8 in. w .g. (Heating) and 0 through 1.
Page 47 BLO WER D A T A SL280UH135V60D BLOWER PERFORMANCE (less lter) BOTTOM RETURN AIR, RETURN AIR FROM BOTH SIDES OR RETURN AIR FROM BOTT OM AND ONE SIDE 0 through 0.
Page 48 BLO WER D A T A SL280UH135V60D BLOWER PERFORMANCE (less lter) SIDE RETURN AIR WITH OPTIONAL RETURN AIR BASE 0 through 0.8 in. w .g. (Heating) and 0 through 1.
Page 49 T ABLE 18 OPERA TING SEQUENCE SL280UHV , Non−Communicating Thermostat with Humidity Control Feature and Single−S peed Outdoor Unit OPERA TING SEQUENCE SYSTEM DEMAND SYSTEM RESPONSE System .
Page 50 T ABLE 19 OPERA TING SEQUENCE SL280UHV , Non−Communicating Thermostat with Humidity Control Feature and T wo−Speed Out door Unit OPERA TING SEQUENCE SYSTEM DEMAND SYSTEM RESPONSE System Co.
Page 51 Unit St art−Up FOR YOUR SAFETY READ BEFORE LIGHTING W ARNING D o not use this furnace if any part has been underwa- ter . Immediately call a licensed professional service technician (o r equivalent) to inspect the furnace and to replace any part of the control system and any gas control which has been under water .
Page 52 12− If the appliance will not operate, follow the instructions T urning Off Gas to Unit" and call your service techni- cian or gas supplier . T urning Off Gas to Unit 1 − Set the thermostat to the lowest setting. 2 − T u rn of f all electrical power to the unit if service is to be performed.
Page 53 High Altitude The manifold pressure, gas orifice and pressure switch may require adjustment or replacement to ensure proper operation at higher altitudes. T ables 22 through 25 shows manifold pressure, pressures switch and gas conversion kits at all altitudes.
Page 54 Other Unit Adjustment s Primary and Secondary Limit s The primary limit is located on the heating compartment vestibule panel. The secondary limits (if equipped) are lo- cated in th e b l ower comp artment, att ached to the back side of the blower .
Page 55 Applications Using A Single−St age Thermost at See figure 38 for ignition control sequence B − Heating Sequence −− Integrated Control Thermostat Selection DIP Switch 1 ON in Single.
Page 56 Service W ARNING ELECTRICAL SHOCK, FIRE, OR EXPLOSION HAZARD. Failure to follow safety warnings exactly could result in dangerous operation, serious injury , death or property damage. Improper servicing could result in dangerous opera- tion, serious injury , death, or property damage.
Page 57 SL280UHV BURNER, COMBUSTION AIR INDUCER ASSEMBL Y & HEA T EXCHANGER REMOV AL FIGURE 39 heat exchanger gasket collector box orifice plate flue transition pressure switch combustion air indu.
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− T urn on power and gas supply to unit.
Page 59 Planned Service Th e following items should be checked during an annual inspection. Power to the unit must be shut of f for the service techni- cian’s safety . Fresh air grilles and louvers (on the unit and in the room where the furnace is installed) − Must be open and unob- structed to provide combustion air .
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 Ins.
Page 61 Integrated Control Diagnostic Codes (continued) Code Diagnostic Codes/S tatus of Equipment Action Required to Clear and Recover E 105 Device communication problem − No other devices on RS BUS (Commu- nication system). Equipment is unable to communicate.
Page 62 Integrated Control Diagnostic Codes (continued) E 131 Corrupted control parameters (V erify configuration of system). Communi- cating only . Reconfigure the system. Replace control if heating or cooling is not available. Only applicable in the communicating mode, not in startup.
Page 63 Integrated Control Diagnostic Codes (continued) Code Diagnostic Codes/S tatus 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 .
Page 64 Integrated Control Diagnostic Codes (continued) E 272 Sof t lockout − Exceeded maximum number of recycles. Last recycle due to the pressure switch opening. Check operation of low pressure switch to see if it is stuck closed on heat call. Check pressure (inches w .
Page 65 Integrated Control Diagnostic Codes (continued) Code Diagnostic Codes/S tatus of Equipment Action Required to Clear and Recover E 312 Restricted air flow in cooling or continuous fan mode is lower than cfm setting.
Page 66 Integrated Control Diagnostic Codes (continued) E 406 LSOM − Compressor open st art circuit. Required amount of current is not passing through S tart current transformer . Clears the error after cur- rent is sensed in ST ART sensor , or after power re- set.
Page 67 Program Unit Cap acity/Size Mode Power−Up − Number displayed represents by integrated control unit size code (furnace model and capacity). If three horizont al bars are displayed followed by continuous E203, furnace control does not recognize unit size code.
Page 68 T roubleshooting: Heating Sequence of Operation HIGH LIMIT SWITCH CLOSED? LOW PRESSURE SWITCH OPEN? INDUCER ON PRE − PURGE (15 SECONDS) 1ST ST AGE GAS V AL VE ENERGIZED FLAME SENSED WITHIN 4.
Page 69 T roubleshooting: Heating Sequence of Operation (Continued) WHEN USED WITH A SINGLE ST AGE THERMOSTA T , SET SW1 TO THE ON POSITION IN DIP SWITCH S4. IF THE HIGH FIRE PRESSURE SWITCH DOES NOT CLOSE WITHIN 5 A TTEMPTS, THE SYSTEM WILL OPERA TE A T LOW FIRE FOR THE REMAINDER OF THE CALL FOR HEA T REQUEST .
Page 70 T roubleshooting: Heating Sequence of Operation (Continued) 2ND ST AGE HEA T RUN MODE: 1ST OR 2ND ST AGE CALL FOR HEA T . ALL INPUTS MONITORED (LIMIT , PRESSURE, CALL FOR HEA T/COOL, FLAME LEV.
Page 71 T roubleshooting: Cooling Sequence of Operation (Continued) 1ST ST AGE COOLING REQUEST RECEIVED ENERGIZE 1ST ST AGE COOLING CONT ACTOR (COMPRESSOR & F AN) 2ND ST AGE COOLING REQUEST? NO YE.
Page 72 T roubleshooting: Continuous Fan Sequence of Operation CALL FOR F AN CALL FOR F AN REMOVED? YES NO NO REQUEST FOR HEA T RECEIVED? REQUEST FOR COOLING RECEIVED? GO TO CALL FOR 1ST ST AGE HEA T .
An important point after buying a device Lennox International Inc. SL280UH090V48B (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Lennox International Inc. SL280UH090V48B yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Lennox International Inc. SL280UH090V48B - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Lennox International Inc. SL280UH090V48B you will learn all the available features of the product, as well as information on its operation. The information that you get Lennox International Inc. SL280UH090V48B will certainly help you make a decision on the purchase.
If you already are a holder of Lennox International Inc. SL280UH090V48B, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Lennox International Inc. SL280UH090V48B.
However, one of the most important roles played by the user manual is to help in solving problems with Lennox International Inc. SL280UH090V48B. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Lennox International Inc. SL280UH090V48B along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
