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Page 1

INSTALLATION

INSTRUCTIONS

SL297UHNV

507760-04

09/2019

Supersedes 507760-03

NOTICE

A thermostat is not included and must be ordered

separately.
A communicating thermostat must be used in

communicating applications.
In non-communicating applications, any Lennox

conventional 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 34.

IMPORTANT

DO NOT use the heat exchanger tubes to lift, drag or

pull the furnace to its installation location.
Doing so will damage the tubes causing noise and or

unsafe operation.

Dallas, Texas USA

DAVE LENNOX SIGNATURE®

GAS FURNACE UPFLOW / HORIZONTAL

AIR DISCHARGE

Contents

Unit Dimensions - inches (mm) ......................................2

Parts Arrangement..........................................................3

SLP297UHNV Gas Furnace ...........................................4

Shipping and Packing List ..............................................4

Safety .............................................................................4

Use of Furnace as a Construction Heaterl .....................5

General ...........................................................................6

Combustion, Dilution, Ventilation Air...............................6

Setting Equipment ..........................................................6

Filters ............................................................................ 11

Duct System ................................................................. 11

Pipe Fittings Specifications

...........................................12

Joint Cementing Procedure ..........................................13

Venting Practices ..........................................................14

Gas Piping ....................................................................29

Electrical .......................................................................32

Integrated Control .........................................................41

Blower Motor Performance ...........................................44

Unit Start-Up .................................................................48

Gas Pressure Measurement.........................................49

Proper Combustion.......................................................50

High Altitude .................................................................50

Repair Parts Lsit ...........................................................50

Sequence of Operation.................................................51

Service..........................................................................53

Program Unit Capacity Size Mode ...............................61

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.

Heatexchanger Tubes

Содержание DAVE LENNOX SIGNATURE SL297UHNV

Страница 1: ...ies Inc Dallas Texas USA DAVE LENNOX SIGNATURE GAS FURNACE UPFLOW HORIZONTAL AIR DISCHARGE Contents Unit Dimensions inches mm 2 Parts Arrangement 3 SLP297UHNV Gas Furnace 4 Shipping and Packing List 4...

Страница 2: ...2 38 Front Panel COMBUSTION AIR INTAKE 1 7 8 48 CONDENSATE TRAP CONNECTION Either Side INTAKE AIR 2 1 4 57 2 7 8 73 6 5 8 168 Not Used 2 Optional Side Return Air Filter Kit is not for use with the Op...

Страница 3: ...at Exchanger Gas Valve Combustion Air Inducer Indoor Blower Two Stage Control Cabinet Panel Inner Panel Gas Pipe Inlet right side only Inlet Vent Pipe Exhaust Vent Pipe Exhaust Coupling Intake Air Ass...

Страница 4: ...ssional HVAC installer or equivalent service agency or the gas supplier Use only the type of gas approved for use with this fur nace Refer to unit nameplate SL297UHNV units are CSA International certi...

Страница 5: ...coves closets attics basements garages crawl spaces and utility rooms in the upflow or horizontal position This furnace design has not been CSA certified for instal lation in mobile homes recreational...

Страница 6: ...Select a location that allows for the required clearances that are listed on the unit nameplate Also consider gas supply connections electrical supply vent connection condensate trap and drain connec...

Страница 7: ...r clearances to accommodate condensate trap For installations on a combustible floor do not install the furnace directly on carpeting tile or other combustible materials other than wood flooring FIGUR...

Страница 8: ...x H 23 x 11 in 584 x 279 mm The opening can be cut as needed to accommodate plenum or IAQ cabinet while maintaining dimensions shown Side return air openings must be cut in the field There are cutting...

Страница 9: ...or exhaust piping installation Cooling coils and supply and return air plenums must be supported separately HORIZONTAL SUSPENSION KIT Bracket typical Metal Strap typical Air Flow Internal Brace provi...

Страница 10: ...elected heating speed with an external static pressure which exceeds 0 8 inches w c Operation at these conditions may result in improper limit operation Supply Air Plenum If the furnace is installed w...

Страница 11: ...lyPro by Duravent InnoFlue by Centrotherm CAUTION Solvent cements for plastic pipe are flammable liquids and should be kept away from all sources of ignition Do not use excessive amounts of solvent ce...

Страница 12: ...st 5 minutes before placing unit into operation 1 Measure and cut vent pipe to desired length 2 Debur and chamfer end of pipe removing any ridges or rough edges If end is not chamfered edge of pipe ma...

Страница 13: ...low for each appliance connected to the venting system being placed into operation could result in carbon monoxide poisoning or death The following steps shall be followed for each appliance connected...

Страница 14: ...ON 4052 or equivalent must be used for con necting PVC exhaust pipe to NORYL furnace exhaust coupling Route piping to outside of structure Continue with instal lation following instructions given in...

Страница 15: ...NOTE ward unit A minimum of 1 4 6mm drop for each 12 305mm of horizontal run is mandatory for drainage NOTE Exhaust piping should be checked carefully to make sure there are no sags or low spots 12 m...

Страница 16: ...6 14 108 107 88 8 46 31 n a 103 102 83 9 41 26 98 97 78 10 36 21 93 92 73 TABLE 5 Continued Maximum Allowable Intake or Exhaust Vent Length in Feet NOTE Size intake and exhaust pipe length separately...

Страница 17: ...ation at Elevation 0 4500 ft Number Of 90 Elbows Used 2 Pipe 3 Pipe Model Model 040 060 080 040 060 080 1 71 56 34 118 117 98 2 66 51 29 113 112 93 3 61 46 24 108 107 88 4 56 41 19 103 102 83 5 51 36...

Страница 18: ...U S A and current CSA B149 Natural Gas and Propane Installation Codes in Canada for details Position termination according to location given in figure 23 In addition position termination so it is fre...

Страница 19: ...able provided in the current edition of the ASHRAE Fundamentals Handbook 2 Poly Propylene vent pipe PP by Duravent and Centrotherm NOTE Concentric terminations are the equivalent of 5 and should be co...

Страница 20: ...e under veranda porch deck or balcony 12 7 feet 2 1m 3 feet 9m within a height 15 feet 4 5m above the meter regulator assembly 3 feet 9m 6 inches 152mm for appliances 10 000 pliances 10 000 Btuh 3kw a...

Страница 21: ...ws See figure 24 4 Exhaust piping must terminate straight out or up as shown A reducer may be required on the exhaust piping at the point where it exits the structure to improve the velocity of exhaus...

Страница 22: ...12 305mm Min above grade or cumulation DIRECT VENT CONCENTRIC WALL TERMINATION 71M80 69M29 or 60L46 US 41W92 or 41W93 Canada INTAKE AIR EXHAUST AIR INTAKE AIR INTAKE AIR EXHAUST AIR OUTSIDE WALL GRADE...

Страница 23: ...Min 12 305 mm Min 20 508 mm Max 6 152 mm Max Intake Elbow WALL SUPPORT B A D E B D E A ALTERNATE TERMINATIONS TEE FORTY FIVE DEGREE ELBOWS ONLY D C 12 1 2 E B A 1 2 As required Flue gas may be acidic...

Страница 24: ...pe from the furnace to the drain 5 Figures 36 and 37 show the furnace and evaporator coil using a separate drain If necessary the condensate line from the furnace and evaporator coil can drain togethe...

Страница 25: ...ble a heat cable kit may be used on the condensate trap and line Heating cable kit is available from Lennox in var ious lengths 6 ft 1 8m kit no 26K68 24 ft 7 3m kit no 26K69 and 50 ft 15 2m kit no 26...

Страница 26: ...ow Switch FIGURE 38 Furnace with Evaporator Coil Using a Common Drain 1 min to 2 Max above condensatedrain connection Condensate DrainConnection Evaporator drain line required Trap at coil is optional...

Страница 27: ...rain Connection In Unit Condensate Drain Connection In Unit Vent To Drain Condensate Drain Connection In Unit Optional Condensate Drain Connection OptionalDrainPipingFromTrap DrainTrapAssembly Furnish...

Страница 28: ...ng suitable hangers or straps Install a drip leg in vertical pipe runs to serve as a trap for sediment or condensate 5 A 1 8 N P T plugged tap or pressure post is located on the gas valve to facilitat...

Страница 29: ...43 Horizontal Applications Possible Gas Piping Configurations GROUND JOINT UNION DRIP LEG MANUAL MAIN SHUT OFF VALVE GROUND JOINT UNION DRIP LEG MANUAL MAIN SHUT OFF VALVE Horizontal Application Left...

Страница 30: ...2 1 1 4 31 75 1 380 35 052 1350 38 22 957 27 09 768 22 25 657 18 60 583 16 50 528 14 95 486 13 76 452 12 79 424 12 00 400 11 33 1 1 2 38 1 1 610 40 894 2090 59 18 1430 40 49 1150 32 56 985 27 89 873 2...

Страница 31: ...rcuit breaker select circuit protection and wire size according to unit nameplate CAUTION Failure to use properly sized wiring and circuit breaker may result in property damage Size wiring and circuit...

Страница 32: ...r Termina tion on the outdoor control must match the indoor control Indoor Blower Speeds Non Communicating When the thermostat is set to FAN ON the indoor blower will run continuously at a field selec...

Страница 33: ...al C Single wire to terminal C Unused wires Unused wires Communicating systems using the Communicating thermostat require four thermostat wires between the thermostat and the furnace air handler contr...

Страница 34: ...ABLED FURNACE COMMUNICATING ENABLED FURNACE ICOMMUNICATING THERMOSTAT CONVENTIONAL NON COMMUNICATING SYSTEM COMMUNICATING SYSTEM CS 7000 THERMOSTAT 24V IN jumper not used in non communicating configur...

Страница 35: ...DO NOT CUT ANY ON BOARD LINKS S1 T STAT FURNACE TERM STRIP OUTDOOR UNIT 1 Heat 2 Cool NOTE Use DIP switch 2 to set second stage heat ON delay OFF 7 minutes ON 12 minutes ON CUT ON BOARD LINK W915 2 ST...

Страница 36: ...2 STAGE COMPR S1 T STAT FURNACE TERM STRIP OUTDOOR UNIT 2 Heat 2 Cool with t stat with humidity control OFF CUT ON BOARD LINK W915 2 STAGE COMPR CUT ON BOARD LINK W914 DEHUM OR HARMONY S1 T STAT FURN...

Страница 37: ...ON BOARD LINK W951 HEAT PUMP T STAT FURNACE TERM STRIP HEAT PUMP 67M41 Y H L Y2 D B L Y2 T T outdoor sensor Dual Fuel Two Stage Heat Pump ComfortSense thermostat w bilities Capable of 2 stage gas heat...

Страница 38: ...ARD LINK W914 DEHUM OR HARMONY T STAT FURNACE TERM STRIP HEAT PUMP 67M41 Y H L Y2 D B L Y2 T T outdoor sensor Dual Fuel Two Stage Heat Pump ComfortSense thermostat w bilities Capable of 2 stage gas he...

Страница 39: ...Page 39 Figure 48...

Страница 40: ...ND FROM 1ST STAGE T STAT R CLASS 2 VOLTAGE TO THERMOSTAT G MANUAL FAN FROM T STAT C THERMOSTAT SIGNAL GROUND CONNECTED TO TRANSFORMER GRD TR CHASIS GROUND GRD Y1 THERMOSTAT 1ST STAGE COOL SIGNAL Y2 TH...

Страница 41: ...after the heating de mand has been satisfied can be adjusted by moving switches 3 and 4 on the integrated control The unit is shipped from the factory with a blower off delay of 90 sec onds The blowe...

Страница 42: ...demand is met motor runs at 100 for 45 seconds then ramps down to stop OFF OFF 100 CFM 100 CFM 45 SEC COMPRESSOR DEMAND Ramping Option D Motor runs at 100 until demand is satisfied Once demand is met...

Страница 43: ...rst Stage Heating Speed cfm Second Stage Heating Speed cfm 24 1106 1234 18 1047 1158 12 989 1110 6 940 1054 Factory Default 886 999 6 837 947 12 780 882 18 722 826 COOLING 1 Cooling Speed DIP Switch S...

Страница 44: ...d Stage Heating Speed cfm 24 1477 2011 18 1403 1883 12 1323 1782 6 1249 1697 Factory Default 1178 1578 6 1103 1477 12 1033 1388 18 965 1291 COOLING 1 Cooling Speed DIP Switch Settings First Stage Cool...

Страница 45: ...ntegrated control W915 must be 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 only TABLE 18 OPERATING SEQUENCE Non Communic...

Страница 46: ...space to maintain a cooler room thermostat setpoint ROOM THERMOSTAT CALLS FOR FIRST AND SECOND STAGE COOLING BASIC MODE only active on a Y1 thermostat demand Normal Operation 1 On On On On Acceptable...

Страница 47: ...nitiate a heating demand 3 Allow the burners to fire for approximately 3 minutes 4 Adjust the thermostat to deactivate the heating demand 5 Wait for the combustion air inducer to stop Set the thermost...

Страница 48: ...Dial 040 90 180 n a n a 060 60 120 150 300 080 45 90 112 224 Natural 1000 btu cu ft Propane 2500 btu cu ft Furnace should operate at least 5 minutes before check ing gas flow Determine time in seconds...

Страница 49: ...0 ft Repair Parts List The following repair parts are available through Lennox dealers When ordering parts include the complete furnace model number listed on the CSA nameplate Example SL297UH040NV36B...

Страница 50: ...Factory Setting 1 On a call for heat thermostat first stage contacts close sending a signal to the integrated control The integrated control runs a self diagnostic program and checks high temperature...

Страница 51: ...o initiates a second stage on delay factory set at 7 minutes adjustable to 12 minutes 5 If the heating demand continues beyond the secondstage on delay the integrated control energizes the combustion...

Страница 52: ...properly sized open and unobstructed to provide combustion air 9 Inspect the furnace intake and exhaust pipes to make sure they are in place structurally sound without holes blockage or leakage and th...

Страница 53: ...ss the flame signal mode The integrated control will display the flame current on 7 segment LED in in micro amps uA Flame signal mode is exited after any of the following Power is reset Pressing and h...

Страница 54: ...clears 5 seconds after fault recovered E111 Low line voltage Reverse line power voltage wiring System resumes normal operation 5 seconds after fault recovered E112 Ground not detected System shuts dow...

Страница 55: ...ppropriate feature will be set as installed and that could be seen in About screen In normal operation after control recognizes sensors alarm will be sent if valid temperature reading is lost To get r...

Страница 56: ...correct operation and restriction Resumes normal operation after fault is cleared E227 Low pressure switch open during trial for ignition or run mode Check pressure inches w c of low pressure switch...

Страница 57: ...connections 1 hour soft lockout Clears when calibration has finished successfully E290 Ignitor circuit fault Failed ignitor or triggering cir cuitry Measure resistance of hot surface ignitor Replace i...

Страница 58: ...ts between R O on integrated control with non communicating outdoor unit Dual fuel module required for heat pump application Configuration link R to O needs to be restored Replace link or hard wire Ap...

Страница 59: ...sor open run circuit Required amount of current is not passing through Run current transformer Clears the error after current is sensed in RUN sensor or 1 normal compressor run cycle or after power re...

Страница 60: ...During that period press and hold push button for 5 seconds Integrated control will store code in memory and will automatically exit Program Unit Capacity Size Mode and reset If second period expires...

Страница 61: ...H S I OFF NO INDUCER OFF AFTER POST PURGE HARD LOCKOUT ERROR CODE FLASHES YES YES YES 1 2 1 LOW PRESSURE SWITCH OPENS 1 2 HARD LOCKOUT REQUIRES THERMOSTAT RESET OR CYCLING OF POWER TO RESET THE LOCKO...

Страница 62: ...ZED ONLY FOR 1ST REQUEST FOR 2ND STAGE HEAT YES CALL FOR HEAT SATISFIED INDUCER SWITCHED TO HIGH SPEED SINGLE STAGE THERMOSTAT 2 STAGE THERMOSTAT NO INDUCER SWITCHED TO LOW SPEED 5 MINUTE DELAY ERROR...

Страница 63: ...ZED ONLY FOR 1ST REQUEST FOR 2ND STAGE HEAT YES CALL FOR HEAT SATISFIED INDUCER SWITCHED TO HIGH SPEED SINGLE STAGE THERMOSTAT 2 STAGE THERMOSTAT NO INDUCER SWITCHED TO LOW SPEED 5 MINUTE DELAY ERROR...

Страница 64: ...RAMPING PROFILES THE SPECIFIC PROFILE IS SELECTED USING THE 1 1 2 2 1 1 1 2 2 DE ENERGIZE 1ST STAGE COOLING CONTACTOR COMPRESSOR FAN 2ND STAGE COOLING REQUEST STILL ACTIVE COOLING REQUEST STILL ACTIV...

Страница 65: ...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 INDOOR BLOWE...

Страница 66: ...t 6 12 18 24 040NV36B Allowed Allowed Allowed Factory Setting Allowed Allowed Allowed Allowed 060NV36B 080NV48C Not Allowed 080NV60C Allowed TABLE 24 Allowable Circulation Speeds SL297UHN Model 28 sec...

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