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© 2025 Lennox Industries Inc.
Dallas, Texas USA
WARNING
This furnace is equipped with an ignition control
factory enabled for use with Lennox A2L refrigerant
systems.
Disabling
functionality on A2L system is prohibited by safety
codes. Refer to furnace installation instructions for
non-A2L and non-Lennox refrigerant system setup.
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.
Contents
Unit Dimensions - inches (mm) ......................................2
Parts Arrangement..........................................................3
SLP297UHNVK Gas Furnace ........................................4
Shipping and Packing List ..............................................4
Safety .............................................................................4
Use of Furnace as a Construction Heater ......................5
General ...........................................................................6
Setting Equipment ..........................................................6
Filters ............................................................................ 11
Duct System ................................................................. 11
Pipe Fittings Specifications...........................................12
Joint Cementing Procedure ..........................................13
Venting Practices ..........................................................14
the
refrigerant
detection
INSTALLATION
INSTRUCTIONS
SL297UHNVK
DAVE LENNOX SIGNATURE
GAS FURNACE UPFLOW / HORIZONTAL
AIR DISCHARGE
508585-01
01/2025
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
diagrams, which begin on Page 35.
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.
Heatexchanger Tubes
Gas Piping ....................................................................31
Electrical .......................................................................34
Ignition Control .............................................................44
Blower Motor Performance ...........................................49
Low GWP Applicatiion ..................................................53
Unit Start-Up .................................................................56
Gas Pressure Measurement.........................................57
Proper Combustion.......................................................58
High Altitude .................................................................58
Repair Parts Lsit ...........................................................58
Sequence of Operation.................................................59
Service..........................................................................61
Program Unit Capacity Size Mode ...............................62
Troubleshooting ............................................................63
Page 1
®
NOTICE
applications
is
illustrated
in
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Summary of Contents for Lennox SIGNATURE SL297UHNVK
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Page 1: Table Of Contents
Page 35. WARNING IMPORTANT This furnace is equipped with an ignition control DO NOT use the heat exchanger tubes to lift, drag or factory enabled for use with Lennox A2L refrigerant pull the furnace to its installation location. systems. Disabling refrigerant... -
Page 2: Unit Dimensions - Inches (Mm)
SL297UHNVK Unit Dimensions - inches (mm) EXHAUST AIR 3-1/4 NOTE - 60C size units that require air volumes over OUTLET (83) 1800 cfm must have one of the following: 1. Single side return air and Optional Return Air Base 1-7/8 (48) with transition that must accommodate required 20 x 25 x 1 inch (508 x 635 x 25 mm) air filter to maintain proper velocity. -
Page 3: Parts Arrangement
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 3... -
Page 4: Slp297Uhnvk Gas Furnace
DANGER SL297UHNVK Gas Furnace The SL297UHNVK Category IV gas furnace is shipped Danger of explosion. ready for installation in the upflow or horizontal position. There are circumstances in which odorant used with The furnace is shipped with the bottom panel in place. The LP/propane gas can lose its scent. -
Page 5: Use Of Furnace As A Construction Heater
Installed in Combination with a Cooling Coil Use of Furnace as Construction Heater NOTE - If a non-Lennox coil is used, consult the coil’s lit- Lennox does not recommend the use of SL297UHNVK erature for the recommended distance from the top of the units as a construction heater during any phase of con- furnace cabinet/heat exchanger. -
Page 6: General
WARNING General These instructions are intended as a general guide and do Blower access panel must be securely in place when not supersede local codes in any way. Consult authorities blower and burners are operating. Gas fumes, which having jurisdiction before installation. could contain carbon monoxide, can be drawn into In addition to the requirements outlined previously, the living space resulting in personal injury or death. -
Page 7: Setting Equipment
SETTING EQUIPMENT UPFLOW APPLICATION Place level on blower Place level on the front blower deck screws to check deck to check side to side forward tilt UNIT FRONT AIR FLOW 1/2” max. SIDE VIEW HORIZONTAL APPLICATION UNIT FRONT AIR FLOW 1/2”... - Page 8 Return Air Guidelines WARNING Return air can be brought in through the bottom or either Improper installation of the furnace can result in side of the furnace installed in an upflow application. If the furnace is installed on a platform with bottom return, make personal injury or death.
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Page 9: Removing The Bottom Panel
Optional Return Air Base CONDENSATE (Upflow Applications Only) TRAP FURNACE FRONT 23 (584) 3−1/4 IF BASE Overall (83) IS USED (Maximum) Minimum WITHOUT 11 (279) IAQ CABINET, Maximum 22−7/16 INDOOR AIR A SINGLE Unit side return air 14 (356) (570) QUALITY RETURN AIR Opening... - Page 10 FIGURE 12, or install the furnace EXHAUST PIPE on a platform, as shown in FIGURE 13. A horizontal sus- pension kit (51W10) may be ordered from Lennox or use equivalent. *Gas connector may be used...
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Page 11: Filters
This the data given in the appropriate Lennox Product reverse flow of the flue gas may result in incomplete com- Specifications bulletin. Additional information is provided bustion and the formation of carbon monoxide gas. -
Page 12: Pipe Fittings Specifications
CAUTION Pipe & Fittings Specifications 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- dards. -
Page 13: Joint Cementing Procedure
TABLE 3 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 14: Venting Practices
WARNING Venting Practices CARBON MONOXIDE POISONING HAZARD Failure to follow the steps outlined below for HORIZONTAL PIPING SUPPORT GUIDELINES each appliance connected to the venting system SCHEDULE 40 being placed into operation could result in carbon PVC - 5' all other pipe* - 3' monoxide poisoning or death. - Page 15 2 - Route piping to outside of structure. Continue with in- REPLACING FURNACE THAT WAS PART OF A stallation following instructions given in general guide- COMMON VENT SYSTEM lines for piping terminations and intake and exhaust piping terminations for direct vent sections. CHIMNEY OR GAS VENT...
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Page 16: Vent Piping Guidelines
Vent Piping Guidelines Piping Size Process NOTE - Lennox has approved the use of DuraVent ® Centrotherm manufactured vent pipe and terminations as an option to PVC. When using the PolyPro by Du- ® What is the raVent or InnoFlue by Centrotherm venting system the ®... - Page 17 TABLE 5 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 18 TABLE 5 Continued Maximum Allowable Intake or Exhaust Vent Length 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. Standard Termination at Elevation 6001 - 7500 ft 2”...
- Page 19 TABLE 5 Continued Maximum Allowable Intake or Exhaust Vent Length in Fee 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. Concentric Termination at Elevation 4501 - 6000 ft 2”...
- Page 20 TABLE 6 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 21 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 22 General Guidelines for Vent Terminations In Direct Vent applications, combustion air is taken from outdoors and the flue gases are discharged to the outdoors. The SL297UHNVK is then classified as a direct vent, Category IV gas furnace. The vent termination is limited by local building codes. In the absence of local codes, refer to the current National Fuel Gas Code ANSI Z223-1/NFPA 54 in U.S.A., and current CSA-B149 Natural Gas and Propane Installation Codes in Canada for details.
- Page 23 ‡ 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 24 Page 23...
- Page 24 Details of Intake and Exhaust Piping Terminations for At least one bracket must be used within 6” from the Direct Vent Installations top of the elbow and then every 24” (610mm) as shown in FIGURE 33, to prevent any movement in any direc- NOTE - In Direct Vent installations, combustion air is taken tion.
- Page 25 8 - A multiple furnace installation may use a group of up to four terminations assembled together horizontally, as shown in FIGURE 31. FIELD-PROVIDED Accelerator not required REDUCER MAY BE for 3” concentric REQUIRED TO ADAPT TABLE 8 DIFFERENT VENT PIPE OUTSIDE SIZE TO TERMINATION EXHAUST PIPE TERMINATION SIZE REDUCTION...
- Page 26 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 27 Condensate Piping CONDENSATE TRAP AND PLUG LOCATIONS This unit is designed for either right- or left-side exit of (Unit shown in upflow position) condensate piping in upflow applications. In horizontal Trap applications, the condensate trap must extend below the (same on unit.
- Page 28 Min. 1” Above Condensate Drain Connection 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. 26K70.
- Page 29 IMPORTANT Furnace with Evaporator Coil Using a Common Drain When combining the furnace and evaporator coil drains together, the A/C condensate drain outlet Evaporator drain line required must be vented to relieve pressure in order for the furnace pressure switch to operate properly. (Trap at coil is optional) Condensate Trap With Optional Overflow Switch (1”...
- Page 30 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.
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Page 31: Gas Piping
6 - In some localities, codes may require installation of a Gas Piping manual main shut-off valve and union (furnished by Gas supply piping should not allow more than 0.5”W.C. installer) external to the unit. Union must be of the drop in pressure between gas meter and unit. - Page 32 Right Side Piping MANUAL MAIN SHUT-OFF VALVE GROUND JOINT UNION DRIP LEG Gas Valve FIELD PROVIDED AND INSTALLED NOTE - BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET FIGURE 44 Horizontal Applications Possible Gas Piping Configurations Horizontal Application MANUAL MAIN SHUT-OFF Right-Side Air Discharge...
- Page 33 TABLE 9 Gas Pipe Capacity - ft3/hr (m3/hr) Nominal Internal Length of Pipe - feet (m) Iron Pipe Diameter Size Inches inches (3.048) (6.096) (9,144) (12,192) (15.240) (18.288) (21.336) (24.384) (27.432) (30,480) (mm) (mm) .622 (12.7) (17.799) (4.87) (3.34) (2.69) (2.29) (2.03) (1.84)
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Page 34: Electrical
Refer to FIGURE 49 for unit schematic and field wiring. Electrical See FIGURE 47 and FIGURE 48 for communicating ther- mostat wiring in communicating applications. TABLE 11 ELECTROSTATIC DISCHARGE (ESD) shows DIP switch and on-board link settings for non-com- Precautions and Procedures municating thermostat applications. - Page 35 For optimal performance in non-communicating applica- When there is a cooling demand, the fan will run on the tions, Lennox recommends use of a conventional high first stage and second stage cooling speed set using the quality electronic digital thermostat or any other with ad- thermostat in the installer setup mode.
- Page 36 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 37 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 38 LENNOX COMMUNICATING OUTDOOR UNIT INDOOR UNIT (1 OR 2 STAGE) FLOAT SWITCH LENNOX COMMUNICATING OUTDOOR UNIT LENNOX COMMUNICATING FURNACE EL297VK, SL280VK, SL280VNK, SL297VK, SLP99VK cutting DS to R will not cause communication interuption or error code CUT* R-DS W914 Page 38...
- Page 39 TABLE 11 Field Wiring Applications With Conventional Thermostat 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 TERM.
- Page 40 TABLE 11 Continued Field Wiring Applications With Conventional Thermostat 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 (M30 T-stat) T'STAT...
- Page 41 TABLE 11 Continued Field Wiring Applications With Conventional Thermostat 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.
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Page 42: System Options
TABLE 11 Continued Field Wiring Applications With Conventional Thermostat 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. - Page 43 Wiring Diagram FIGURE 49 Page 43...
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Page 44: Ignition Control
Ignition Control TWO STAGE, VARIABLE SPEED, COMMUNICATING 107899-01 FIGURE 50 TABLE 12 TABLE 14 1/4”QUICK CONNECT TERMINALS THERMOSTAT INPUT TERMINALS 120 VAC OUTPUT TO HUMIDIFIER LOW STAGE HEAT XMFR 120 VAC OUTPUT TO TRANSFORMER HIGH STAGE HEAT 120 VAC INPUT TO CONTROL CIRC 120 VAC OUTPUT TO CIRCULATING LOW STAGE COOL... -
Page 45: Ignition Control Diagnostic Codes
Ignition Control Diagnostic Codes DIAGNOSTIC CODES / STATUS OF FURNACE CODE IDLE MODE (DECIMALBLINKS AT 1 HERTZ -- 0.5 SECONDS ON, 0.5 SECONDS OFF INDOOR BLOWER OPERATION: CONTINUOUS FAN MODE (COSTANT TORQUE ONLY) INDOOR BLOWER OPERATION: FOLLOWED BY CFM SETTING FOR INDOOR BLOWER (1 SECOND ON, 0.5 SECOND OFF) / CFM SETTING FOR MODE DISPLAYED (VARIALBE SPEED ONLY) COOLING STAGE (1 SECOND ON, 0.5 SECOND OFF) 1 OR 2 DISPLAYED / PAUSE / REPEAT CODES. - Page 46 Ignition Control Diagnostic Codes (Continued) SOFT LOCKOUT FAULTS (60 MINUTES) UNABLE TO COMMUNICATE WITH CIRCULAR MOTOR E201 GAS VALVE RELAY (1ST OR 2ND STAGE) CONTACT SHORTED E205 HOT SURFACE IGNITOR (HSI) SENSED OPEN E207 SOFT LOCKOUT-FLAME FAILURE ON IGNITION, IGNITION RETRY>MAX, LAST FAILED RETRY DUE TO FLAME E270 FAILURE SOFT LOCKOUT-PRESSURE SWITCH OPEN, IGNITION RETRY>MAX, LAST FAILED RETRY DUE TO LPSW OPEN...
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Page 47: Integrated Control
TABLE 16 Integrated Control Switch Settings Conventional Thermostat (non-communicating) Blower Off Delay Switch Settings SL297UHNVK units are equipped with a two-stage, vari- Blower Off Delay Switch 3 Switch 4 able speed integrated control. This control manages igni- Seconds tion timing, heating mode fan off delays and indoor blower speeds based on selections made using the control dip switches and jumpers. - Page 48 NOTE - The off portion of the selected ramp profile also Ramping Option D applies during heat pump operation in dual fuel applica- • Motor runs at 100% until demand is satisfied. tions. • Once demand is met, motor ramps down to stop. TABLE 19 Cooling Mode Blower Speed Ramping Ramping...
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Page 49: Blower Data
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 iHarmony Zoning System Applications - Minimum blower speed is 250 cfm. - Page 50 Continuous Fan Only speed is selectable at 28% and 38% of the selected second stage cooling speed - 080NV48C minimum 380 cfm. 080NV060C minimum 450 cfm. Lennox iHarmony Zoning System Applications - 080NV48C minimum blower speed is 380 cfm, 080NV060C 450 cfm.
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Page 51: System Response
(R to DS) on SureLight® control With Heat Pump - Cut W914 (R to DS) & W951 (R to O) on SureLight® control Dave Lennox ComfortSense® 7000 thermostat to use for this application - Y2081 4 heat / 2 cool *Dehumidification blower speed is 70% of COOL speed for all units . -
Page 52: Operating Sequence
With Heat Pump - Cut W914 (R to DS) & W951 (R to O) on SureLight® control Dave Lennox ComfortSense® 7000 thermostat to use for this application - Y2081 4 heat / 2 cool *Normal operation first stage cooling blower speed is 70% COOL speed. -
Page 53: Low Gwp Applicatiion
Low GWP Application WARNING For use with Lennox approved evaporator coil and LGWP sensors only. Use original manufacturer recommended LGWP sensors if using non Lennox approved evaporator coil. CONNECTING THE FURNACE CONTROL BOARD SENSOR. See FIGURE 53 and follow steps below: 1 - Route sensor wire #1 through provided grommet. - Page 54 FURNACE CONTROL BOARD LOW GWP MODES OF 2. The furnace control board activates the blower (high OPERATION speed). The blower purges refrigerant from the cabinet, plenum, and ductwork. The modes of operation for the furnace control board are Initializing, Normal, Leak Detected, and Fault. 3.
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Page 55: Start-Up Procedure
LGWP TEST BUTTON FUNCTIONALITY THERMOSTAT COMPATIBILITY The furnace control board is equipped with a Test/Reset Thermostats that preserve memory settings are compati- push button. The Test button can be used to perform sev- ble with the furnace control board. Examples include: eral functions, depending on the mode of operation of the •... -
Page 56: Unit Start-Up
WARNING Unit Start-Up FOR YOUR SAFETY READ BEFORE OPERATING If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal WARNING injury or death. Do not use this furnace if any part has been Gas Valve Operation (FIGURE 54) underwater. -
Page 57: Gas Pressure Measurement
Failure To Operate Supply Pressure Measurement If the unit fails to operate, check the following: A threaded plug on the inlet side of the gas valve provides access to the supply pressure tap. Remove the threaded 1 - Is the thermostat calling for heat? plug, install a field-provided barbed fitting and connect a 2 - Are access panels securely in place? manometer to measure supply pressure. -
Page 58: Proper Combustion
100ppm. 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: SL297UH040NV36BK-01. All service must be performed by a licensed professional installer (or equivalent), service agency, or gas supplier. -
Page 59: Sequence Of Operation
Applications Using Two-Stage Thermostat Other Unit Adjustments See FIGURE 55 for ignition control sequence NOTE - See troubleshooting flow charts if any safety A - Heating Sequence -- Integrated Control Thermostat switches are found to be open. Selection DIP Switch 1 OFF in “Two-Stage” Position Primary Limit. - Page 60 Applications Using A Single-Stage Thermostat 4 - After the 20-second warm-up period has ended, the See FIGURE 56 for ignition control sequence gas valve is energized on low fire (first stage) and ignition occurs. At the same time, the control module B - Heating Sequence -- Integrated Control Thermostat sends a signal to begin an indoor blower 30-second Selection DIP Switch 1 ON in “Single-Stage”...
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Page 61: Service
At the beginning of each heating season, and to comply Perform a general system test. Turn on the furnace to with the Lennox Limited Warranty, your system should be check operating functions such as the start-up and shut- checked as follows: off operation. -
Page 62: Program Unit Capacity Size Mode
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, 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 63: 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 BLOWER... - Page 64 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 65 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 66 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 67 Troubleshooting: Continuous Fan Sequence of Operation CALL FOR FAN CALL FOR FAN INDOOR BLOWER ON CONTINUOUS FAN SPEED MAINTAIN INDOOR CALL FOR FAN BLOWER AT REMOVED? CONTINUOUS FAN REQUEST MAINTAIN INDOOR FOR COOLING GO TO CALL FOR COOLING BLOWER AT RECEIVED? CONTINUOUS FAN REQUEST...
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