Download
Share
Print this page
Lennox SL297UHNV Series Unit Information
  1. Manuals
  2. Brands
  3. Lennox Manuals
  4. Furnace
  5. SL297UHNV Series
  6. Unit information
Lennox SL297UHNV Series Unit Information

Lennox SL297UHNV Series Unit Information

Communicating-enabled units
Hide thumbs Also See for SL297UHNV Series:

Advertisement

Quick Links

S e r v i c e L i t e r a t u r e
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
sizing.
Units are factory equipped for use with natural gas.
SL297UHNV model units are equipped with a communi-
cating enabled SureLight
tegrated 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.
Procedures outlined in this manual are presented as a
recommendation only and do not supersede or replace lo-
cal or state codes. In the absence of local or state codes,
the guidelines and procedures outlined in this manual (ex-
cept where noted) are recommendations only and do not
constitute code.

TABLE OF CONTENTS

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2
I Unit Components . . . . . . . . . . . . . . . . . . . . . . . Page 11
II Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 33
III Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 52
VI Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . Page 59
VIII Field Wiring and Jumper Settings
IX Program Unit Capacity Size Mode
X Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . Page 72
UNIT INFORMATION
UNIT INFORMATION
two-stage variable speed in-
®
. . . . . . . Page 67
. . . . . . . Page 71
Corp 1802-L1
Revised 08/2022
Improper
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.
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.
Page 1
SL297UHNV
WARNING
installation,
adjustment,
CAUTION
©2016 Lennox Industries, Inc.
alteration,

Advertisement

loading

Related Manuals for Lennox SL297UHNV Series

Summary of Contents for Lennox SL297UHNV Series

  • Page 1: Table Of Contents

    S e r v i c e L i t e r a t u r e Revised 08/2022 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.

  • Page 2: Specifications

    SP ECIF ICATIONS Model No. SL297UH040NV36B SL297UH060NV36B Heating AFUE 97.5% 97.5% Performance High Input - Btuh 40,000 60,000 Fire Output - Btuh 39,000 58,000 Temperature rise range - °F 30-60 50-80/25-55 Gas Manifold Pressure (in. w.g.) 3.5 / N/A 3.5 / 4.0 Nat.
  • Page 3 OPT IONAL AC C ESSORIES - ORD ER SEPARAT ELY NOTE - FURNACES CANNOT BE TWINNED! “B” Width “C” Width Models Models CABINET ACCESSORIES Horizontal Suspension Kit - Horizontal only 51W10 51W10 Return Air Base - Upflow only 50W98 50W99 High Performance Economizer (Commercial Only) 10U53 10U53...
  • Page 4 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% and 38% of the selected second stage cooling speed - minimum 250 cfm. Lennox Smart Zoning System Applications - Minimum blower speed is 250 cfm.
  • Page 5 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% and 38% of the selected second stage cooling speed - minimum 250 cfm. Lennox Smart Zoning System Applications - Minimum blower speed is 250 cfm.
  • Page 6 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% and 38% of the selected second stage cooling speed - minimum 250 cfm. Lennox Smart Zoning System Applications - Minimum blower speed is 250 cfm.
  • Page 7 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% and 38% of the selected second stage cooling speed - minimum 380 cfm. Lennox Smart Zoning System Applications - Minimum blower speed is 380 cfm.
  • Page 8 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% and 38% of the selected second stage cooling speed - minimum 250 cfm. Lennox Smart Zoning System Applications - Minimum blower speed is 380 cfm.
  • Page 9 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% and 38% of the selected second stage cooling speed - minimum 450 cfm. Lennox Smart Zoning System Applications - Minimum blower speed is 450 cfm.
  • Page 10 Parts Arrangement Exhaust Vent Pipe Burner Assembly Intake Air Assembly Heat Exchanger Rollout Switch Gas Valve Inlet Vent Pipe Exhaust Coupling Gas Pipe Inlet Combustion (right side only) Air Inducer Cabinet Indoor Blower Inner Panel Panel Two-Stage Control FIGURE 1 Page 10...

  • Page 11: I Unit Components

    I-UNIT COMPONENTS Circuit Breaker (CB8) A 24V circuit breaker is also located in the control box. The SL297UHNV unit components are shown in FIGURE 1. switch provides overcurrent protection to the transform- The gas valve, combustion air inducer and burners can er (T1).
  • Page 12 However, if the second stage prove switch closes during The unit will switch to second-stage heat on call from the the first stage heat pre-purge, the control will allow sec- indoor thermostat. If there is a simultaneous call for first ond stage heat.
  • Page 13 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 TB83 HEAT PUMP...
  • Page 14 INTEGRATED CONTROL CONFIGURATION GUIDE CLG BLOWER SPEED ADJUSTMENT 2ND STAGE HEAT ON DELAY DEFAULT 7 MIN CONTINUOUS FAN MODE BLOWER SPEED UPSTAGE THERMOSTAT SELECTION DELAY + 10% MEDIUM−LOW SPEED TWO STAGE (38%) THERMOSTAT 12 MIN − 10% UPSTAGE MEDIUM−HIGH DELAY SPEED 1−STAGE (70%)
  • Page 15 TABLE 4 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 “P” (variable speed only) Program unit capacity size (Unit Code) Two horizontal lines Soft disable...
  • Page 16 TABLE 5 Integrated Diagnostic Codes/Status of Equipment 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 17 TABLE 5 Continued 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 18 TABLE 5 Continued 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. E207 Hot surface ignitor sensed open.
  • Page 19 TABLE 5 Continued 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 20 TABLE 5 Continue 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”...
  • Page 21 TABLE 5 Continued Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E406 LSOM - Compressor open start circuit. Required amount of current is not passing through Start cur- rent transformer. Clears the error after current is sensed in START sensor, or after power reset.
  • Page 22 Ramping Option C TABLE 8 • Motor runs at 100% until demand is satisfied. Cooling Blower Speed Adjustment • Once demand is met, motor runs at 100% for 45 Adjustment Switch 7 Switch 8 seconds then ramps down to stop. +10% (approx) Factory Default -10% (approx)
  • Page 23 (R to DS) on SureLight® control With Heat Pump - Cut W914 (R to DS) & W951 (R to O) on SureLight® control Dave Lennox CS7500 thermostat to use for this application - Y2081 4 heat / 2 cool *Dehumidification blower speed is 70% of COOL speed for all units .
  • Page 24 With Heat Pump - Cut W914 (R to DS) & W951 (R to O) on SureLight® control Dave Lennox CS7500 thermostat to use for this application - Y2081 4 heat / 2 cool *Normal operation first stage cooling blower speed is 70% COOL speed.
  • Page 25 When line voltage is applied to B3, there will be a large inrush of power lasting less than 1/4 second. This inrush Earlier ECM motors used on other Lennox furnace charges a bank of DC filter capacitors inside the controller.
  • Page 26 Motor Start-Up Troubleshooting Motor Operation When B3 begins start-up, the motor gently vibrates back To verify motor operation see steps below and FIGURE 8 and forth for a moment. This is normal. During this time and FIGURE 9. the electronic controller is determining the exact position 1 - Remove J48 (5 pin power plug) from P48 on the of the rotor.
  • Page 27 BLOWER B3 HARNESS CONNECTORS BLOWER B3 HARNESS CONNECTORS P48 5 Pin P49 4 Pin P48 5 Pin SHAFT SHAFT MOTOR with INTEGRATED CONTROLLER P49 4 Pin MOTOR with INTEGRATED CONTROLLER P48 5 Pin J48 5 Pin P49 4 Pin J49 4 Pin J48 Connector J49 4 Pin Control Connector 120v...
  • Page 28 Troubleshooting Motor Windings TEST A Ensure that motor windings are not damaged by perform- Measure the resistance between each of the three motor ing the following tests: leads (3-pin plug) and the unpainted part of the end shield NOTE - If your ohm meter is not an auto-ranging type, set If the winding resistance to ground is <100k ohms, replace it to the highest ohm scale (100k ohms or greater) before the motor and control module.
  • Page 29 Inlet and outlet pressure taps are located on the valve. A ed. The switch may have a different set point for each unit regulator adjustment screw is located on the valve. model number. See Lennox Repair Parts Handbook if limit switch must be replaced, Page 29...
  • Page 30 HEATING COMPONENTS Heat Exchanger Gaskets Burner Box Air Gas Plenum Burner Rollout Switch (location) Sensor Primary Limit Air Orifice Ignitor Gas Valve Gas Orifice FIGURE 13 Page 30...
  • Page 31 Ignitor Check Test 1 Check ignitor circuit for correct resistance. Remove 5-pin plug from control. Check ohms reading across terminals 1 and 5. Reading should be between 39 and 70 ohms. If value is correct, this is the only test needed. If the reading on the meter is not correct, (0 or infinity) then a second test is needed.
  • Page 32 8. Combustion Air Inducer Prove Switch (S18) SL297UHNV series units are equipped with a dual combustion air proving switch (first and second FIGURE 15 stage) located on the combustion air inducer housing. See FIGURE 15 and FIGURE 16.
  • Page 33 II-PLACEMENT AND INSTALLATION CAUTION All pipe, fittings, primer and solvent cement must conform Solvent cements for plastic pipe are flammable with American National Standard Institute and the Ameri- liquids and should be kept away from all sources of can Society for Testing and Materials (ANSI/ASTM) stan- ignition.
  • Page 34 TABLE 19 OUTDOOR TERMINATION USAGE* STANDARD CONCENTRIC Wall Kit 1-1.2 inch 2 inch 3 inch Flush Mount Vent Pipe 2 inch 3 inch Input Size Field 71M80 (US) 69M29 (US) 60L46 (US) Dia. in. 51W11 (US) Fabricated 44W92 44W92 44W93 22G44 (US) 44J40 (US) 51W12...
  • Page 35 WARNING Venting Practices CARBON MONOXIDE POISONING HAZARD Piping Suspension Guidelines Failure to follow the steps outlined below for each appliance connected to the venting system SCHEDULE 40 being placed into operation could result in carbon PVC - 5' monoxide poisoning or death. all other pipe* - 3' The following steps shall be followed for each appliance connected to the venting system being...
  • Page 36 4 - Tighten both top and bottom bands to 40in-lbs. See Vent Piping Guidelines FIGURE 19. NOTE - Lennox has approved the use of DuraVent ® NOTE - PVC / ABS / NORYL transition solvent Centrotherm manufactured vent pipe and terminations cement WELD-ON 4052 (or equivalent) must be as an option to PVC.
  • Page 37 In some applications which permit the use of several dif- ferent sizes of vent pipe, a combination vent pipe may be Which style termination used. Contact Lennox’ Application Department for assis- being used? tance in sizing vent pipe in these applications.
  • Page 38 TABLE 21 NOTE - Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust must be same pipe size. Standard Termination at Elevation 0 - 4500 ft Maximum Allowable Intake or Exhaust Vent Length in Feet 2”...
  • Page 39 TABLE 21 Continued Concentric Termination at Elevation 0 - 4500 ft 2” Pipe 3” Pipe Number Of 90° Model Model Elbows Used Concentric Termination at Elevation 4501 - 6000 ft 2” Pipe 3” Pipe Number Of 90° Model Model Elbows Used Concentric Termination at Elevation 6001-7500 ft 2”...
  • Page 40 TABLE 22 Maximum Allowable Exhaust Vent Lengths With Furnace Installed in a Closet or Basement Using VentilatedAttic or Crawl Space For Intake Air in Feet NOTE - Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust must be same pipe size.
  • Page 41 TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN UPFLOW EXHAUST EXHAUST INTAKE 2” 2” 2” 2” 3” Appliance TRANSITION Appliance Adaptor 2” Adaptor DO NOT transition *2” from smaller to larger 2” 3” pipe in horizontal runs *2” of exhaust pipe. INTAKE TRANSITION * When transitioning up in pipe size, use the shortest length of 2”...
  • Page 42 Intake Piping At vent termination, care must be taken to maintain protec- tive coatings over building materials (prolonged exposure The SL297UHNV furnace is installed in direct vent appli- to exhaust condensate can destroy protective coatings). cations. It is recommended that the exhaust outlet not be located Follow the next two steps when installing the unit in Di- within 6 feet (1.8m) of an outdoor AC unit because the rect Vent applications, where combustion air is taken from...
  • Page 43 TABLE 23 Maximum Allowable Exhaust Vent Pipe Length (in ft.) Without Insulation In Unconditioned Space For Winter Design Temperatures Two - Stage High Efficiency Furnace Winter Design Unit Input Size Vent Pipe Temperatures1 °F Diameter (°C) 32 to 21 2 in (0 to -6) 3 in 20 to 1...
  • Page 44 ‡ Permitted only if veranda, porch, deck or balcony is fully open on a minimum of locally adopted installation codes. two sides beneath the floor. Lennox recommends avoiding this location if possible. FIGURE 25 Page 44...
  • Page 45 Details of Intake and Exhaust Piping Terminations for TABLE 24 Direct Vent Installations EXHAUST PIPE TERMINATION SIZE REDUCTION NOTE - In Direct Vent installations, combustion air is taken Termination from outdoors and flue gases are discharged to outdoors. SL297UHNV MODEL Pipe Size NOTE - Flue gas may be slightly acidic and may adverse- ly affect some building materials.
  • Page 46 FIELD FABRICATED WALL TERMINATION NOTE − FIELD−PROVIDED REDUCER MAY BE 2” (51mm) 3” (76mm) REQUIRED TO ADAPT LARGER VENT PIPE SIZE Vent Pipe Vent Pipe TO TERMINATION A− Minimum clearance above grade or average 12” (305 mm) 12” (305 mm) snow accumulation B−...
  • Page 47 2” EXTENSION FOR 2” PVC PIPE1” EXTENSION FOR 3” PVC PIPE 12” EXHAUST (305mm) FURNACE VENT 5-1/2” 5” (140mm) EXHAUST (127mm) INTAKE PIPE 18” MAX. Front View FURNACE (457mm) INTAKE EXHAUST VENT PIPE 12” (305mm) Min. GLUE EXHAUST above grade or END FLUSH INTO Inches (mm) INTAKE...
  • Page 48 Heating cable kit is available from Lennox in var- ious lengths; 6 ft. (1.8m) - kit no. 26K68; 24 ft. (7.3m) - kit no.
  • Page 49 CONDENSATE TRAP LOCATIONS Furnace With Evaporator Coil Using A Separate Drain (Unit shown in upflow position with remote trap) Evaporator drain FieldProvidedVent line required Min. 1” Above Condensate (Trap at coil is optional) Drain Connection Field Provided Vent 1” Min. (1”...
  • Page 50 Furnace with Evaporator Coil Using a Separate Drain (Unit shown in horizontal left-hand discharge position) Field Provided Vent Evaporator (4” min. to 5” max. above Coil condensate connection) 4”min 5”max 5’ max. PVC Pipe Only Condensate DrainConnection (Trap at coil is optional) Drain Pan Piping from furnace and evaporator coil must slope down a minimum 1/4”...
  • Page 51 TRAP / DRAIN ASSEMBLY USING 1/2” PVC OR 3/4” PVC Optional Condensate Drain Connection Adapter 3/4 inch slip X 3/4 inch mpt (not furnished) 90° Street Elbow 3/4 inch PVC (not furnished) Adapter 3/4 inch slip X 3/4 inch mpt (not furnished) Condensate Drain Connection In Unit 1 (25 mm) Min.

  • Page 52: Start Up

    III-START-UP 3 - Turn off all electrical power to the unit. 4 - This furnace is equipped with an ignition device A-Preliminary and Seasonal Checks which automatically lights the burners. Do not try to 1 - Inspect electrical wiring, both field and factory light the burners by hand.

  • Page 53: Heating System Service Checks

    6. If manifold pressure is specialty Gas Leak Detector is strongly recommended. It not within range continue. Valve is not adjustable. is available through Lennox under part number 31B2001. Do not adjust manifold pressure. See Corp. 8411-L10, for further details.
  • Page 54 5 - Record signal pressure and compare to value in table 7 - Reinstall the air orifice on the left side of the coupling 27. If signal pressure is within range continue. If the and push firmly into place. signal is not within range go to “Troubleshooting”. 8 - Reinstall air intake coupling making sure it is fully 6 - Shut off unit and remove manometer and signal seated in the gray coupling.
  • Page 55 Air Orifice Replacement Gray Coupling Air Orifice and Part Number Air Intake Coupling FIGURE 47 Operating Signal Pressure Measurement FIGURE 48 TABLE 27 Production Resonance (more air) Difficulty Igniting (less air) Unit Orifice Size (Part No) Orifice Size Cat No Orifice Size Cat No -040...
  • Page 56 Troubleshooting Poor Ignition or Combustion Resonance Issues Check Air Orifice See Figure 47. Check the following 1-Does the unit have the correct air orifice size? See table 27. 2 -Is the orifice fully seated tight against the elbow ? way? 4 - Is the air inlet screen clear of any obstruction ? Correct any problems found.
  • Page 57 G- Proper Combustion A poorly grounded furnace can contribute to premature ignitor failure. Use the following procedure to check for Furnace should operate minimum 15 minutes with correct ground and voltage to the integrated control. manifold pressure and gas flow rate before checking com- 1 - Measure the AC voltage between Line Neutral bustion.

  • Page 58: Typical Operating Characteristics

    V-TYPICAL OPERATING CHARACTERISTICS EXTERNAL STATIC PRESSURE A-Blower Operation and Adjustment Supply Duct Static ________ Return Duct Static + _____ 1 - Blower operation is dependent on thermostat control system. Total Duct Static = ________ (dry coil) 2 - 2 - Generally, blower operation is set at thermostat subbase fan switch.
  • Page 59 7 - Remove heat exchanger. It may be necessary to specifications provided by the filter manufacturer spread cabinet side to allow more room. against the data given in the appropriate Lennox 8 - Back wash using steam. Begin from the burner Product Specifications bulletin.
  • Page 60 HEATING COMPONENTS Heat Exchanger Gaskets Burner Box Air Gas Plenum Burner Rollout Switch (location) Sensor Primary Limit Air Orifice Ignitor Gas Valve Gas Orifice FIGURE 53 Page 60...

  • Page 61: Wiring And Sequence Of Operation

    VII- Wiring and Sequence of Operation Page 61...
  • Page 62 NOTE - If the low fire pressure switch does not close CAUTION the combustion air inducer will switch to high fire. After a 15 second pre-purge the high fire pressure Failure to use properly sized wiring and circuit breaker may result in property damage. Size wiring switch will close and the unit will begin operation on and circuit breaker(s) per Product Specifications high fire.
  • Page 63 Applications Using A Single-Stage Thermostat 4 - After the 20-second warm-up period has ended, See FIGURE 55 for ignition control sequence the gas valve is energized on low fire (first stage) and ignition occurs. At the same time, the control B - Heating Sequence -- Integrated Control Thermostat module sends a signal to begin an indoor blower Selection DIP Switch 1 ON in “Single-Stage”...
  • Page 64 Communicating Enabled Furnace with Communicating Enabled Furnace with a a Non-Communicating Outdoor Unit Communicating Enabled Outdoor Unit COMMUNICATING FURNACE COMMUNICATING FURNACE OPTIONAL DISCHARGE AIR SENSOR OPTIONAL DISCHARGE AIR SENSOR OPTIONAL OUTDOOR OPTIONAL COMMUNICATING AIR SENSOR OUTDOOR THERMOSTAT AIR SENSOR COMMUNICATING THERMOSTAT DOOR AIR CONDITIONING OR HEAT PUMP UNIT...
  • Page 65 Optional Accessories for use with any Communicating System NOTE: ICOMMUNICATING THERMOSTAT SENSES HUMIDITY & CONTROLS HUM CONTACTS TO CYCLE HUMIDIFIER BASED 120V CONNECTIONS “HUM” CONTACT IS QUIRED. CLOSED ANYTIME HUMIDITY DEMAND IS PRESENT TIONS. BUILT INTO ALL COMMUNICATING ENABLED OUT DOOR UNITS).
  • Page 66 LENNOX COMMUNICATING OUTDOOR UNIT INDOOR UNIT (1 OR 2 STAGE) FLOAT SWITCH LENNOX COMMUNICATING OUTDOOR UNIT LENNOX COMMUNICATING FURNACE EL296V, SL280V, SL280VN, SL297V, SLP99V cutting DS to R will not cause communication interuption or error code CUT* R-DS W914 Page 66...
  • Page 67 VIII- SL297UHNV Field Wiring Applications With Conventional Thermostat TABLE 31 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...
  • Page 68 TABLE 31 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 TERM. STRIP UNIT CUT ON-BOARD LINK W915 2 STAGE COMPR...
  • Page 69 TABLE 31 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. STRIP Single Stage Heat Pump CUT ON-BOARD LINK ComfortSense W951...
  • Page 70 TABLE 31 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. STRIP Single Stage Heat Pump CUT ON-BOARD LINK ComfortSense W951...
  • Page 71 IX- Program Unit Capacity Size Modes 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, furnace − control does not recognize unit size code. Configure per the following: Furnace control in IDLE mode No heating, cooling or indoor fan operation)
  • Page 72 X- 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 INDOOR SWITCH WATCHGUARD − AFTER HEAT FAN LIMIT SWITCH CODE CLOSED WITHIN 3...

  • Page 73: Troubleshooting

    Troubleshooting: Heating Sequence of Operation (Continued) 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 74 Troubleshooting: Heating Sequence of Operation (Continued) 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...
  • Page 75 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 76 Troubleshooting: Continuous 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...

This manual is also suitable for:

Sl297uh040nv36bSl297uh060nv36bSl297uh080nv48cSl297uh080nv60c