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©

2021 Lennox Industries Inc.

Corp. 1802-L1

Revised 02/2021

SL297UHNV

Service Literature

COMMUNICATING ENABLED SL297UHNV SERIES UNITS

SL297UHNV series units are 90% efficiency gas furnaces
used for upflow or horizontal applications only.
SL297UHNV units are available in heating capacities of
40,000 to 80,000 Btuh and cooling applications up to 4
tons. Refer to Product Specifications Manual for proper siz
ing.

Units are factory equipped for use with natural gas.
SL297UHNV model units are equipped with a communicat
ing enabled SureLight

®

two-stage variable speed integrated

control. All units use a redundant gas valve to assure safety
shut-off as required by C.S.A.

All specifications in this manual are subject to change. Pro
cedures outlined in this manual are presented as a recom
mendation only and do not supersede or replace local or
state codes. In the absence of local or state codes, the
guidelines and procedures outlined in this manual (except
where noted) are recommendations only and do not consti
tute code.

TABLE OF CONTENTS

Specifications

Page 2

. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

I Unit Components

. . . . . . . . . . . . . . . . . . . . . . .

II Installation

. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

III Start Up

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

IV Heating System Service Checks

. . . . . . . . .

V Typical Operating Characteristics

. . . . . . . . .

VI Maintenance

. . . . . . . . . . . . . . . . . . . . . . . . . .

VII Wiring and Sequence of Operation

. . . . . .

VIII Field Wiring and Jumper Settings

. . . . . . .

IX Program Unit Capacity Size Mode

. . . . . . .

X Troubleshooting

. . . . . . . . . . . . . . . . . . . . . . . .

WARNING

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 HVAC in
staller (or equivalent), service agency or the gas sup
plier.

CAUTION

As with any mechanical equipment, contact with
sharp sheet metal edges can result in personal in
jury. Take care while handling this equipment and
wear gloves and protective clothing.

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Содержание SL297UH040NV36B

Страница 1: ...ce local or state codes In the absence of local or state codes the guidelines and procedures outlined in this manual except where noted are recommendations only and do not consti tute code TABLE OF CO...

Страница 2: ...edures and according to FTC labeling regulations Isolated combustion system rating for non weatherized furnaces Gas Heating Performance Model No SL297UH080NV48C SL297UH080NV60C 1 AFUE 97 5 97 5 High F...

Страница 3: ...ain Kit US 51W18 51W18 Canada 15Z70 15Z70 CONTROLS iComfort Communicating Thermostat 12U67 12U67 iComfort Wi Fi Thermostat 10F81 10F81 1 Remote Outdoor Air Temperature Sensor for dual fuel and Humidit...

Страница 4: ...age Heating Speed cfm Second Stage Heating Speed cfm 24 863 1129 18 807 1087 12 761 1021 6 713 775 Factory Default 716 723 6 683 686 12 589 599 18 562 558 COOLING 1 Cooling Speed DIP Switch Settings F...

Страница 5: ...gs First 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 Swi...

Страница 6: ...Settings First Stage Heating Speed cfm Second Stage Heating Speed cfm 24 1098 1229 18 1039 1168 12 992 1104 6 930 1051 Factory Default 885 996 6 822 937 12 773 878 18 717 817 COOLING 1 Cooling Speed...

Страница 7: ...ge Heating Speed cfm Second Stage Heating Speed cfm 24 1433 1542 18 1353 1480 12 1275 1398 6 1229 1334 Factory Default 1154 1253 6 1093 1181 12 1024 1107 18 958 1054 COOLING 1 Cooling Speed DIP Switch...

Страница 8: ...tage Heating Speed cfm Second Stage Heating Speed cfm 24 1591 2135 18 1503 2026 12 1426 1921 6 1334 1828 Factory Default 1277 1716 6 1197 1609 12 1124 1504 18 1037 1402 COOLING 1 Cooling Speed DIP Swi...

Страница 9: ...d Stage Cooling Speed cfm Low Medium Low Medium High 2 High Low Medium Low Medium High 2 High 1094 1279 1430 1609 1599 1823 2051 2239 Factory Default 1003 1160 1308 1454 1438 1649 1863 2097 894 1044 1...

Страница 10: ...ger 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 Assembly Rol...

Страница 11: ...l Can cause injury or death Unsafe operation will re sult if repair is attempted 4 Integrated Control A92 Units are equipped with the iComfort enabled Sur eLight two stage variable speed integrated co...

Страница 12: ...P switch to ON for use with a single stage thermostat While in the single stage thermostat mode the burners will always fire on first stage heat The combustion air inducer will operate on low speed an...

Страница 13: ...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 THERMOSTAT 2ND STAGE COOL SIGNAL O TH...

Страница 14: ...2 100 50 OFF OPTION B OFF 82 100 OFF OPTION C OFF 100 100 OFF OPTION D OFF 100 OFF DEFAULT 10 10 HIGH SPEED MEDIUM HIGH SPEED MEDIUM LOW SPEED LOW SPEED 7 PROTECTIVE PLASTIC FILM ON DIP SWITCHES MAY B...

Страница 15: ...the menu to access the flame signal mode The integrated control will display the flame current on seven segment LED in in micro amps uA Flame signal mode is exited after any of the following Power is...

Страница 16: ...clears 5 seconds after fault recovered E 111 Line voltage polarity reversed Reverse line power voltage wiring System resumes normal operation 5 seconds after fault recovered E 112 Ground not detected...

Страница 17: ...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 rid of set ting and alar...

Страница 18: ...during trial for ignition or run mode 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...

Страница 19: ...soft lockout Clears when calibra tion has finished successfully E 290 Ignitor circuit fault Failed ignitor or triggering circuitry Measure resistance of hot surface ignitor Replace if open or not wit...

Страница 20: ...tegrated control with non communi cating outdoor unit Dual fuel module required for heat pump applica tion Configuration link R to O needs to be restored Re place link or hard wire Applicable in non c...

Страница 21: ...ond stage on delay when a single stage ther mostat is being used The switch is factory set in the OFF position which provides a 7 minute delay before second stage heat is initiated If the switch is to...

Страница 22: ...50 CFM Ramping Option B S Motor runs at 82 for approximately 7 1 2 minutes If demand has not been satisfied after 7 1 2 minutes motor runs at 100 until demand is satisfied S Once demand is met motor r...

Страница 23: ...ontrol 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 cool ing only TABLE 12 OPERATING SEQUENCE SL297UHNV Non Communic...

Страница 24: ...wing the room 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 Opera tion 1 On On On...

Страница 25: ...BEARING ROTOR The controller uses sensing devices to sense what position the rotor is in at any given time By sensing the position of the rotor and then switching the motor windings on and off in se...

Страница 26: ...t before attempt ing to service motor DANGER Disconnect power from unit and wait at least five minutes to allow capacitors to discharge before at tempting to service motor Failure to wait may cause pe...

Страница 27: ...48 5 Pin Line Voltage Connector J49 4 Pin Control Connector J48 5 Pin J49 4 Pin FIGURE 9 BLOWER B3 HARNESS CONNECTORS MOTOR with INTEGRATED CONTROLLER SHAFT P49 4 Pin P48 5 Pin P48 5 Pin P49 4 Pin J48...

Страница 28: ...Each lead to lead resistance should be the same If the measured resistance is greater than 20 ohms re place the motor and control module Test B FIGURE 12 C Heating Components 1 Ignitor The SureLight...

Страница 29: ...The burner has one orifice located between the gas valve and the air intake assembly figure13 To check or replace the orifice remove the black iron inlet pipe from the gas valve then remove the four s...

Страница 30: ...Page 30 SL297UHNV HEATING COMPONENTS FIGURE 13 Gas Valve Primary Limit Ignitor Sensor Gas Orifice Air Orifice Rollout Switch location Air Gas Plenum Gaskets Burner Heat Exchanger Burner Box...

Страница 31: ...of ignitor at the plug Reading should be between 39 and 70 ohms If the reading is correct then the problem is with the wiring between the jack plug and the control If reading is not correct the issue...

Страница 32: ...f the combustion air inducer is not operating or if the flue becomes obstructed On heat demand first or second stage the switch senses that the combustion air inducer is operating It closes a cir cuit...

Страница 33: ...Cement For Fittings Pipe of the same material D2564 D2235 F493 ABS to PVC or CPVC Transition Solvent Cement D3138 CANADA PIPE FITTING SOLVENT CEMENT MARKING PVC CPVC Pipe and Fittings ULCS636 PVC CPVC...

Страница 34: ...llow fumes to dissipate for at least 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 en...

Страница 35: ...NING HAZARD Failure to follow the steps outlined below for each appliance connected to the venting system being placed into operation could result in carbon mon oxide poisoning or death The following...

Страница 36: ...and bottom bands to 40 in lbs See figure 19 5 Tighten top band Route piping to outside of structure Continue with installa tion following instructions given in piping termination sec tion FIGURE 19 Fu...

Страница 37: ...o determine acceptable vent lengths Con tact the Application Department for more information concerning sizing of vent systems which include multiple pipe sizes FIGURE 20 Horizontal Installation Offse...

Страница 38: ...5 61 46 24 95 95 73 118 117 98 6 56 41 19 90 90 68 113 112 93 7 51 36 14 85 85 63 108 107 88 8 46 31 n a 80 80 58 103 102 83 9 41 26 75 75 53 98 97 78 10 36 21 70 70 48 93 92 73 TABLE 21 Continued Ma...

Страница 39: ...bows used to terminate the vent pipe outside the structure must be included in the total vent length calculation Standard Termination at Elevation 0 4500 ft Number Of 90 El bows Used 2 Pipe 2 1 2 Pipe...

Страница 40: ...ssible INTAKE TRANSITION 3 2 EXHAUST INTAKE 2 Appliance Adaptor Appliance Adaptor FIGURE 23 SIDE VIEW 2 2 2 2 or TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN HORIZONTAL APPLICATIONS RIGHT HAND DISCH...

Страница 41: ...for de tails Position termination according to location given in figure 25 In addition position termination so it is free from any ob structions and 12 above the average snow accumulation At vent term...

Страница 42: ...8 1Refer to 99 Minimum Design Temperature table provided in the current edition of the ASHRAE Fundamentals Handbook 2 Poly Propylene vent pipe PP by Duravent and Centrotherm NOTE Concentric terminatio...

Страница 43: ...ve paved sidewalk or paved driveway located on public property Clearance 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...

Страница 44: ...may be required on the exhaust pip ing at the point where it exits the structure to improve the velocity of exhaust away from the intake piping See table 24 FIGURE 26 UNCONDITIONED ATTIC SPACE 1 2 13M...

Страница 45: ...D Exhaust pipe length E Wall support distance from top of each pipe intake exhaust 12 305 mm Min 12 305 mm Min 6 152 mm Min 24 610 mm Max 9 227 mm Min 12 305 mm Min 16 405 mm Max 6 152 mm Max 6 152 m...

Страница 46: ...de or average snow accumulation optional intake elbow SL297UHNV DIRECT VENT APPLICATION USING EXISTING CHIMNEY NOTE Do not discharge exhaust gases directly into any chimney or vent stack If ver tical...

Страница 47: ...vaporator coil using a separate drain If necessary the conden sate line from the furnace and evaporator coil can drain together See figures 38 40 and 42 Upflow furnace figure 40 In upflow furnace appl...

Страница 48: ...rap FIGURE 38 Furnace Condensate DrainConnection FromEvaporator Coil Optional Condensate Trap With Optional Overflow Switch Field Provided Vent Upflow furnace 1 Min to 2 Max Horizontal Furnace 4 Min t...

Страница 49: ...Piping from furnace and evaporator coil must slope down a minimum 1 4 per ft toward trap Trap at coil is option FIGURE 42 Unit with Evaporator Coil Using a Common Drain Unit shown in horizontal left h...

Страница 50: ...Condensate Drain Connection In Unit Vent To Drain Condensate Drain Connection In Unit Optional Condensate Drain Connection OptionalDrainPipingFromTrap DrainTrapAssembly Furnished DrainTrap Assembly w...

Страница 51: ...be primed with suffi cient water to ensure proper condensate drain opera tion WARNING If you do not follow these instructions exactly a fire or explosion may result causing property damage personal i...

Страница 52: ...king piping connections for gas leaks use pre ferred means Kitchen detergents can cause harmful corro sion on various metals used in gas piping Use of a specialty Gas Leak Detector is strongly recomme...

Страница 53: ...n too much air If the unit ignites but with loud resonance the orifice is too small and needs more air The air orifice is located inside the gray coupling between the clamps Figure 47 show correspondi...

Страница 54: ...Page 54 FIGURE 46 REMOVE SCREWS Screws Screw FIGURE 47 Gray Coupling 2 Air Intake Coupling 3 4 5 6 7 8 Air Orifice and Part Number 8 9 Air Orifice Replacement...

Страница 55: ...alve TABLE 28 Unit Production Resonance more air Difficulty Igniting less air Orifice Size Part No Orifice Size Cat No Orifice Size Cat No 040 0 800 16 0 812 01 21U23 0 787 20 21U01 060 0 995 14 1 010...

Страница 56: ...ng is complete Check Gas Manifold Pressure Replace air orifice see table 3 Check signal Pressure Signal pressure within range shown in table 27 Replace gas valve Check the following 1 Vent air intake...

Страница 57: ...e following procedure to check for ground and voltage to the integrated control 1 Measure the AC voltage between Line Neutral spade terminals and C terminal low voltage terminal block on the integrate...

Страница 58: ...y the blower motor running and the evaporator coil dry observe the manometer reading Adjust blow er motor speed to deliver the air desired according to the job requirements For heating speed second st...

Страница 59: ...res and refer to figure 1 and 53 when dis assembling unit Use papers or protective covering in front of furnace while removing heat exchanger assembly 1 Turn off both electrical and gas power supplies...

Страница 60: ...Page 60 SL297UHNV HEATING COMPONENTS FIGURE 53 Gas Valve Primary Limit Ignitor Sensor Gas Orifice O ring Rollout Switch location Air Gas Plenum Gaskets Burner Heat Exchanger Burner Box...

Страница 61: ...Page 61 VII Wiring and Sequence of Operation SL297UHNV Schematic Wiring Diagram...

Страница 62: ...ion the unit will switch to low fire 3 After the pre purge is complete a 20 second initial ig nitor warm up period begins The combustion air in ducer continues to operate at low speed 4 After the 20 s...

Страница 63: ...also initi ates a second stage on delay factory set at 7 min utes adjustable to 12 minutes 5 If the heating demand continues beyond the second stage on delay the integrated control energizes the combu...

Страница 64: ...E OPERATION COMMUNICATING THERMOSTAT Indoor Unit Controller Outdoor Unit Communicating thermostat Single wire to terminal C Single wire to terminal C Unused wires Systems using a communicating thermos...

Страница 65: ...P DEHUMIDIFIER CONTROL HVAC EQUIPMENT DH STANDARD 1 OR 2 STAGE AC OR HP UNIT 24V IN JUMPER icomfort ENABLED SL297UHNV FURNACE icomfort ENABLED SL297UHNV FURNACE ico Wi Fi THERMOSTAT CONVENTIONAL NON C...

Страница 66: ...NY ON BOARD LINKS S1 T STAT FURNACE TERM STRIP OUTDOOR UNIT Not required on all units 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...

Страница 67: ...ACE TERM STRIP OUTDOOR UNIT Not required on all units 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 FURNACE...

Страница 68: ...ON BOARD LINK W951 HEAT PUMP L7724U 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 7000 L7724U thermostat w dual fuel capa b...

Страница 69: ...BOARD LINK W914 DEHUM OR HARMONY L7724U 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 7000 L7724U thermostat w dual fuel cap...

Страница 70: ...od 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 expir...

Страница 71: ...ONDS 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 L...

Страница 72: ...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 73: ...L 2ND STAGE CALL FOR HEAT SATISFIED NO YES DE ENERGIZE 2ND STAGE GAS VALVE INDUCER SPEED SWITCHED TO LOW SPEED 1 2 3 1ST STAGE HEAT 1ST STAGE CALL FOR HEAT SATISFIED NO YES GAS VALVE DE ENERGIZED INDU...

Страница 74: ...SPEED RAMPING PROFILES THE SPECIFIC PROFILE IS SELECTED USING T 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 A...

Страница 75: ...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 BLOWER AT CONTINUOUS FAN MAINTAIN INDOOR BLOWER AT CONTINUOUS FAN DE ENERGIZ...

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