Lennox EL297DF045XE36B Unit Information
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Lennox EL297DF045XE36B Unit Information

Lennox EL297DF045XE36B Unit Information

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S e r v i c e L i t e r a t u r e
EL297DFE series units are high efficiency condensing
gas furnaces used for downflow applications only, manu-
factured with Lennox Duralok heat exchangers formed of
aluminized steel. EL297DFE units are available in heating
capacities of 44,000 to 110,000 Btuh and cooling applica-
tions up to 5 tons. Refer to Product Specifications Manual
for proper sizing.
Units are factory equipped for use with natural gas. Kits
are available for conversion to LPG operation. EL297DFE
model units are equipped with the SureLight
constant torque integrated control. EL297DFE unit meets
the California Nitrogen Oxides (NOx) Standards and Cal-
ifornia Seasonal Efficiency requirements. 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
Blower Performance Data . . . . . . . . . . . . . . . . . . Page 4
I Unit Components . . . . . . . . . . . . . . . . . . . . . . . . Page 7
II Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 24
III Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 47
IV Heating System Service Checks . . . . . . . . . Page 48
V Typical Operating Characteristics . . . . . . . . . Page 51
VI Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . Page 52
VIII Field Wiring and Jumper Settings . . .
X Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . Page 62
UNIT INFORMATION
UNIT INFORMATION
100094
04-2024
EL297DFE SERIES UNITS
two-stage
®
. . . . Page 58
Page 1
WARNING
Improper
installation,
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.
CAUTION
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.
EL297DFE
adjustment,
alteration,
©2016 Lennox Industries, Inc.

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Summary of Contents for Lennox EL297DF045XE36B

  • Page 1: Table Of Contents

    EL297DFE series units are high efficiency condensing gas furnaces used for downflow applications only, manu- factured with Lennox Duralok heat exchangers formed of aluminized steel. EL297DFE units are available in heating capacities of 44,000 to 110,000 Btuh and cooling applica- tions up to 5 tons.

  • Page 2: Specifications

    SP ECIF ICATIONS Model No. EL297DF045XE36B EL297DF070XE48B EL297DF090XE48CEL297DF110XE60C Heating AFUE Performance High Input - Btuh 44,000 66,000 88,000 110,000 Fire Output - Btuh 43,000 65,000 86,000 108,000 Temperature rise range - °F 35-65 35-65 40-70 45-75 Gas Manifold Pressure (in. w.g.) 3.5 / 10.0...
  • Page 3 OPTIONAL A C C ESSORIES - ORD ER SEPARAT ELY “B” Width Models “C” Width Models CABINET ACCESSORIES Downflow Combustible Flooring Base 11M60 11M61 CONTROLS Blower Relay Kit (for two-stage outdoor units) 85W66 85W66 Furnace Twinning Panel Y3653 Y3653 Furnace Twinning Kit 16W72 16W72 E30 Smart Wi-Fi Thermostat...

  • Page 4: Blo Wer Data

    BLO WER DATA EL297DF045XE36B PERFORMANCE (Less Filter) Air Volume / Watts at Various Blower Speeds External High Medium-High Medium Medium-Low Static (Black) (Brown) (Blue) (Yellow) (Red) Pressure in. w.g. Watts Watts Watts Watts Watts 0.00 1466 1313 1198 0.10 1434...
  • Page 5 B LO WER DATA EL297DF090XE48C PERFORMANCE (Less Filter) Air Volume / Watts at Various Blower Speeds External High Medium-High Medium Medium-Low Static (Black) (Brown) (Blue) (Yellow) (Red) Pressure in. w.g. Watts Watts Watts Watts Watts 0.00 1792 1553 1420 1348 1228 0.10 1750...

  • Page 6: Parts Identification

    PARTS IDENTIFICATION CONTROL BOX (Includes integrated control, transformer and door switch) CONSTANT TORQUE BLOWER MOTOR (hidden) BAG ASSEMBLY (shipping location) COMBUSTION AIR INDUCER BLOWER DECK DuralokPlus HEAT EXCHANGER ASSEMBLY OUTER ACCESS PANEL COLD END HEADER BOX COMBUSTION AIR INDUCER PRESSURE SWITCH PRIMARY LIMIT BURNER BOX ASSEMBLY (includes sensor, rollout switches and ignitor)

  • Page 7: I Unit Components

    I-UNIT COMPONENTS 3. Circuit Breaker (CB8) EL297DFE unit components are shown in FIGURE 1. The A 24V circuit breaker is also located in the control box. The gas valve, combustion air inducer and burners can be switch provides overcurrent protection to the transformer accessed by removing the access panel.
  • Page 8 After the 15-second pre-purge period, the SureLight ig- TABLE 1 nitor warms up for 20 seconds after which the gas valve SureLight Control 5 Pin Terminal Designation ® opens for a 4-second trial for ignition. The ignitor remains Pin # Function energized during the trial until flame is sensed.

  • Page 9: Integrated Control

    Integrated Control 103699-XX INTEGRATED CONTROL 24VAC Indoor Blower Terminals Ignitor and Combustion Air Inducer Neutrals Flame Sense S4 DIP Switches Diagnostic Push Button On Board Links THERMOSTAT CONNECTIONS (TB1) 3/16” QUICK CONNECT TERMINALS DS = DEHUMIDIFICATION SIGNAL FLAME SENSE SIGNAL W2 = HEAT DEMAND FROM 2ND STAGE T/STAT HI COOL 24VAC W1 = HEAT DEMAND FROM 1ST STAGE T/STAT...

  • Page 10: Flame Sense

    Integrated Control 107048-XX Line Voltage Ignitor and Combustion Accessories Humidifier Air Inducer Neutrals ECM DRIVE - 24VAC Line Voltage Flame Sense On Board Links Thermostat Connections 3/16” QUICK CONNECT TERMINALS THERMOSTAT CONNECTIONS HI COOL (24VAC) DS= Dehumidification signal LO COOL (24VAC) W2= Heat demand from 2 stage Tstat HI HEAT (24VAC)
  • Page 11 INTEGRATED CONTROL CONFIGURATION GUIDE 2ND STAGE HEAT ON DELAY 7 MIN UPSTAGE THERMOSTAT SELECTION DELAY COOLING BLOWER-OFF DELAY TWO STAGE THERMOSTAT 12 MIN UPSTAGE *45 SECOND DELAY COOL BLOWER 1−STAGE OFF DELAY THERMOSTAT (TIMED STAGING) −SEE SW #2 HSI/CAI 2 SECOND COOL BLOWER HEATING BLOWER−OFF DELAY OFF DELAY...
  • Page 12 TABLE 3 Integrated Control Diagnostic Modes Display Action (when button released) No Change Remain in idle mode Solid “E” Enter diagnostic recall mode Solid “F” Enter flame signal mode TABLE 4 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).
  • Page 13 TABLE 4 Continued E110 Low line voltage. Line Voltage Low (Voltage lower than nameplate rating). Check power line voltage and correct. Alarm clears 5 seconds after fault recovered. E111 Line voltage polarity reversed. Reverse line power voltage wiring. System resumes normal operation 5 seconds after fault recovered.
  • Page 14 TABLE 4 Continued Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E125 Control failed self-check, internal error, Hardware problem on the control. Cycle power on control. Replace failed hardware. Will restart if error recovers. if problem prevents service and is persistent. Critical alert. Cleared Integrated control not communicating.
  • Page 15 TABLE 4 Continued Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E270 Soft lockout - Exceeded maximum number of Check for proper gas flow. Ensure that ignitor is lighting burner. retries. No flame current sensed. Check flame sensor current. Clears when heat call finishes successfully.
  • Page 16 Integrated Control DIP Switches TABLE 5 Units are equipped with a two-stage integrated control. Blower Off Heating Mode Delay Switch Settings This control manages ignition timing, heating mode fan Blower Off Delay off delays and indoor blower speeds based on selections Switch 3 Switch 4 Seconds...

  • Page 17: Blower Wheel Replacement

    B- Indoor Blower Motor BLOWER WHEEL REPLACEMENT IMPORTANT Center Blower Wheel in Blower Housing Each blower is statically and dynamically balanced as an assembly before installation in the unit. Units are equipped with a constant torque ECM motor. It has a DC motor coupled to an electronic control module both contained in the same motor housing.
  • Page 18 Multi−Meter (set to VAC) Multi−Met e (set to VA Test 3 (if necessary) "9A” NOTE- Ignition control illustration is typical Check for 120 volts across terminals “L1” and “Neutrals” on the "7A” integrated control. If voltage is present, problem is with the har ness.
  • Page 19 Replacing the Motor Module motor connector pins. These should all read approximately the same resistance within an ohm. NOTE - Not all motors have field replaceable control mod- 3 - Check to see if the blower wheel spins freely. ules. Only motors that utilize a 4 pin power connector and 5 pin signal connector as shown below may have replace- Motor Test able controls.
  • Page 20 The switch may have a different set point for each unit flame signal is sensed. To check flame sense signal use model number. See Lennox Repair Parts Handbook if lim- the push-button found on the integrated control and go to it switch must be replaced.

  • Page 21: Heating Components

    HEATING COMPONENTS Burner Assembly Intake Air Top Cap Sensor Rollout Switch Rollout Switch Ignitor Manifold And Gas Orifices Burner Box Cover Two-Stage Gas Valve FIGURE 15 Page 21...
  • Page 22 Ignitor Check Test 1 Check ignitor circuit for correct resistance. Remove 5−pin plug from control. Check ohms reading across terminals 1 and 5. 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 23 7. Combustion Air Inducer (B6) and Cold End Header Set points vary depending on unit size. See TABLE 11, TABLE 12 and TABLE 13. Both pressures sensed by the switches are negative relative to atmospheric pressure. If All units use a two-speed combustion air inducer to move the inlet or exhaust pipes, or the heat exchanger become air through the burners and heat exchanger during heating obstructed, the switch senses the loss of differential pres-...

  • Page 24: Ii-Placement And Installation

    II-PLACEMENT AND INSTALLATION TABLE 14 Continued All pipe, fittings, primer and solvent cement must conform CANADA PIPE & FITTING & SOLVENT MARKING with American National Standard Institute and the Ameri- CEMENT can Society for Testing and Materials (ANSI/ASTM) stan- POLYPROPYLENE VENTING SYSTEM dards.
  • Page 25 8 - Re-use the patch plate to cover the hole in the top Patch Plate Top Cap cap. See FIGURE 19. Remove the 2 screws which secure the top cap to the furnace on the right side Sheet Metal and re-install securing the right edge of the patch Patch Plate plate and the right side of the top cap to the furnace.
  • Page 26 TABLE 15 OUTDOOR TERMINATION USAGE* STANDARD CONCENTRIC Flush Mount Wall Kit 1-1/2 inch 2 inch 3 inch Vent Pipe Input Size 2 inch 3 inch Field Dia. in. 71M80 (US) 69M29 (US) 60L46 (US) Fabricated 51W11 (US) 22G44 (US) 44J40 (US) 44W92 44W92 44W93...

  • Page 27: Danger Of Explosion

    Joint Cementing Procedure Venting Practices 1 - In areas where piping penetrates joists or interior All cementing of joints should be done according to the walls, hole must be large enough to allow clearance specifications outlined in ASTM D 2855. on all sides of pipe through center of hole using a NOTE - A sheet metal screw may be used to secure the hanger.
  • Page 28 Removal of the Furnace from Common Vent 5 - After the main burner has operated for 5 minutes, test for leaks of flue gases at the draft hood relief In the event that an existing furnace is removed from a opening.
  • Page 29 Do not use screens or perforated metal in exhaust or FIGURE 23 intake terminations. Doing so will cause freeze-ups and NOTE - Lennox offers a glueless vent adapter kit 17H92 may block the terminations. as an option for exhaust exiting at the furnace top cap coupling.
  • Page 30 TABLE 17 Maximum Allowable Intake or Exhaust Vent Length Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Intake and Exhaust must be same size. NOTE - Additional vent pipe and elbows 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 1-1/2”...
  • Page 31 TABLE 17 Continued Concentric Termination Elevation 4501 - 10,000 ft Number 1-1/2” Pipe 2” Pipe 2-1/2” Pipe 3” Pipe Of 90° Model Model Model Model Elbows Used TABLE 18 Maximum Allowable Exhaust Vent Length Using Ventilated Attic or Crawl Space For Intake Air in Feet NOTE - Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length calculation.

  • Page 32: Top View

    TYPICAL EXHAUST PIPE CONNECTIONS 045/070 Only 2” 1−1/2” 2” 2” 2” TRANSITION 2” 2” Exhaust Exhaust 3” DO NOT transition from larger to smaller pipe in horizontal runs TRANSITION of exhaust pipe. INTAKE EXHAUST DO NOT transition from smaller *2” to larger pipe size in horizontal TOP VIEW runs of exhaust pipe.
  • Page 33 TYPICAL EXHAUST CONNECTIONS WITH RIGHT SIDE VENT OPTION Pipe Length 4” Maximum (Not Furnished) 3” 2” 2” TRANSITION *2” 2” Plate (Furnished) Street Ell (Not Furnished) TOP VIEW * When transitioning up in pipe size, use the shortest length of 2” PVC pipe possible. NOTE Intake pipe and exhaust pipe must be the same diameter.
  • Page 34 EQUIPMENT IN CONFINED SPACE Intake Piping (Inlet Air from Ventilated Crawlspace and Outlet Air to Outside) The EL297DFE furnace may be installed in either direct Roof Terminated vent or non-direct vent applications. In non-direct vent Exhaust Pipe applications, when intake air will be drawn into the furnace from the surrounding space, the indoor air quality must be considered.
  • Page 35 The EL297DFE is then classified as a direct vent, Catego- TYPICAL AIR INTAKE PIPE CONNECTIONS ry IV gas furnace. NON−DIRECT VENT APPLICATIONS In both Non-Direct Vent and Direct Vent applications, the vent termination is limited by local building codes. In the INTAKE absence of local codes, refer to the current National Fuel SCREEN...
  • Page 36 TABLE 19 Maximum Allowable Exhaust Vent Pipe Length (in ft. ) Without Insulation In Unconditioned Space For Winter Design Temperatures Two - Stage High Efficiency Furnace Vent Pipe Unit Input Size Winter Design Temperatures1 °F (°C) Diameter 1-1/2 in 32 to 21 2 in (0 to -6) 2-1/2 in...
  • Page 37 ‡ Permitted only if veranda, porch, deck or balcony is fully open NOTE - This figure is intended to illustrate clearance on a minimum of two sides beneath the floor. Lennox recommends requirement and does not serve as a substitute for avoiding this location if possible.
  • Page 38 ‡ 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 33 Page 38...
  • Page 39 Details of Intake and Exhaust Piping Terminations for 6 - On field supplied terminations, a minimum distance Direct Vent Installations between the end of the exhaust pipe and the end of the intake pipe without a termination elbow is 8” and NOTE - In Direct Vent installations, combustion air is taken a minimum distance of 6”...
  • Page 40 7 - If intake and exhaust piping must be run up a side wall to position above snow accumulation or other obstructions, piping must be supported. At 12” EXHAUST least one bracket must be used within 6” from the (305mm) VENT 5-1/2”...
  • Page 41 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 42 Details of Exhaust Piping Terminations for Non-Direct Vent Applications 12” (305mm) ABOVE AVE. Exhaust pipes may be routed either horizontally through SNOW an outside wall or vertically through the roof. In attic or ACCUMULATION closet installations, vertical termination through the roof is preferred.

  • Page 43: Condensate Trap Location

    Heat cable kit is available from Lennox in various lengths; 6 ft. (1.8m) - kit no. 26K68; 24 ft. (7.3m) - kit no. 26K69; and 50 ft.
  • Page 44 Furnace with Evaporator Coil Furnace with Evaporator Using a Separate Drain Coil Using a Common Drain Field Provided Vent Field Provided Vent 1” min. 2” max. above 1” min. 2” max. above condensate drain. condensate drain. Condensate Condensate Drain Connection Drain Connection Evaporator Drain Line Evaporator Drain Line...
  • Page 45 TRAP / DRAIN ASSEMBLY USING 1/2” PVC OR 3/4” PVC COLD END HEADER BOX WITH 3/4” DRAIN CONNECTION 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...
  • Page 46 TRAP / DRAIN ASSEMBLY USING 1/2” PVC OR 3/4” PVC COLD END HEADER BOX WITH 1/2” DRAIN CONNECTION Optional Condensate Drain Connection Adapter 1/2 inch slip X 1/2 inch mpt (Not Furnished) 90° Street Elbow 1/2 inch PVC (Not Furnished) Adapter 1/2 inch slip X 1/2 inch mpt (Not Furnished) Condensate Drain...

  • Page 47: 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 light the burners by hand. 1 - Inspect electrical wiring, both field and factory installed for loose connections.

  • Page 48: Heating System Service Checks

    Gas Leak Detector is strongly recommended. It a more accurate time.) Divide by two and compare to time is available through Lennox under part number 31B2001. in TABLE 21. If manifold pressure matches TABLE 24 and See Corp. 8411-L10, for further details.
  • Page 49 NOTE- To obtain accurate reading, shut off all other gas G- Proper Combustion appliances connected to meter. Furnace should operate minimum 15 minutes with correct TABLE 21 manifold pressure and gas flow rate before checking com- bustion. See sections E- and F-. Take combustion sample GAS METER CLOCKING CHART beyond the flue outlet.
  • Page 50 I- Proper Ground and Voltage 2 - In addition, measure the AC voltage from Line Hot to Line Neutral (spade terminals) on the integrated con- Furnace must be properly grounded for proper perfor- trol. See FIGURE 55. This voltage should be in the mance.

  • Page 51: Typical Operating Characteristics

    V-TYPICAL OPERATING CHARACTERISTICS C-External Static Pressure 1 - 1 - Tap locations shown in FIGURE 57. A-Blower Operation and Adjustment 2 - Punch a 1/4” diameter hole in supply and return 1 - Blower operation is dependent on thermostat control air plenums.

  • Page 52: Maintenance

    Before using any filter with this system, check the specifications provided by the filter manufacturer against the data given in the appropriate Lennox Product Specifications bulletin.
  • Page 53 Cleaning Heat Exchanger 20 - Back wash heat exchanger with soapy water solution or steam. If steam is used it must be below If cleaning the heat exchanger becomes necessary, follow 275°F (135°C) . the below procedures and refer to FIGURE 1 when disas- 21 - Thoroughly rinse and drain the heat exchanger.
  • Page 54 Cleaning the Burner Assembly (if needed) 9 - Reinstall the burner box assembly using the existing four screws. Make sure that the burners line up in 1 - Turn off electrical and gas power supplies to furnace. the center of the burner ports. Remove upper and lower furnace access panels.

  • Page 55: Wiring And Sequence Of Operation

    CUT SIZE 9" WIDE x 8-1/4" TALL VII- Wiring and Sequence of Operation Wiring Diagram EL27DFE COMBUSTION AIR COMBUSTION AIR BLOWER MOTOR BLOWER MOTOR DOOR INTERLOCK IGNITOR CIRC FLAME SENSE WHT/PINK FLAME SENSOR 120V BLUE BLUE MV COM PINK PURPLE S102 HIGH HEAT PRESSURE SWITCH...
  • Page 56 Electronic Ignition 3 - After the pre-purge is complete, a 20-second initial ignitor warm-up period begins. The combustion air WARNING inducer continues to operate at low speed. 4 - After the 20-second warm-up period has ended, Electric Shock Hazard. Can cause injury or death. the gas valve is energized on low fire (first stage) Unit must be properly grounded in accordance with national and local codes.
  • Page 57 Applications Using A Single-Stage Thermostat 4 - After the 20-second warm-up period has ended, the gas valve is energized on low fire (first stage) B - Heating Sequence -- Integrated Control Thermostat and ignition occurs. At the same time, the control Selection DIP Switch 1 ON in “Single-Stage”...
  • Page 58 VIII- EL297DFE Field Wiring Applications TABLE 27 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 59 TABLE 27 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 60 TABLE 27 Continued DIP Switch Settings and On-Board Links DIP Switch 1 Thermostat On Board Links Must Be Cut To Select Wiring Connections 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 61 TABLE 27 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 62: Troubleshooting

    IX- Troubleshooting HEATING SEQUENCE OF OPERATION NORMAL AND ABNORMAL HEATING MODE POWER ON GAS VALVE OFF. COMBUSTION AIR INDUCER OFF. INDOOR BLOWER OFF. (RESET CONTROL BY CONTROL SELF-CHECK OKAY? TURNING MAIN POWER OFF.) POLARITY REVERSED. POLARITY OKAY? STATUS ERROR CODE 5 + 4. IS THERE A SIGNAL HOLDS UNTIL UNIT IS PROPERLY GROUNDED.

  • Page 63: Heating Sequence Of Operation

    HEATING SEQUENCE OF OPERATION CONTINUED THERMOSTAT CALLS FOR HEAT STATUS LED - HEARTBEAT. (Refer to box A on previous page) GAS VALVE OFF. COMBUSTION AIR INDUCER FIRST-STAGE (LOW FIRE) PRESSURE OFF. INDOOR BLOWER OFF. UNIT WILL RETRY SWITCH CLOSED WITHIN 2.5 MINUTES? AFTER 5-MINUTE WAIT PERIOD.
  • Page 64 HEATING SEQUENCE OF OPERATION CONTINUED THERMOSTAT CALLS FOR HEAT. STATUS LED -- HEARTBEAT. SEE BOX A. FLAME SIGNAL ABOVE ( 1.40 microamps) LOW FLAME SIGNAL (Does not affect control operation) STATUS ERROR CODE 1 + 2. SINGLE-STAGE THERMOSTAT MODE TWO STAGE THERMOSTAT MODE (DIP SWITCH SET AT “ON”) (DIP SWITCH SET AT “OFF”) START SECOND-STAGE RECOGNITION...
  • Page 65 HEATING SEQUENCE OF OPERATION CONTINUED SEE BOX A NORMAL OPERATION. SEE BOX B THERMOSTAT CALLS FOR HEAT. RETURN TO FIRST-STAGE HEAT MODE. FIRST-STAGE CONTINUES UNTIL SECOND- STAGE PRESSURE SWITCH CAN BE PROVEN SECOND-STAGE (HIGH FIRE) HEAT or HEAT DEMAND IS SATISFIED. A FIVE (5) PRESSURE SWITCH CLOSED? MINUTE WAIT PERIOD IS INITIATED BEFORE RETRY.

  • Page 66: Cooling Sequence Of Operation

    COOLING SEQUENCE OF OPERATION POWER ON SIGNAL POLARITY REVERSED. CONTROL WILL CONTINUE TO CALL FOR COOLING IS POLARITY REVERSED? IN THIS CONDITION. STATUS ERROR CODE 5 + 4. SIGNAL IMPROPER GROUND AT LED. CONTROL WILL CONTINUE TO CALL FOR COOLING IS THERE IN THIS CONDITION.
  • Page 67 CONTINUOUS LOW SPEED FAN SEQUENCE OF OPERATION MANUAL FAN SELECTION MADE AT THERMOSTAT. AFTER 2 SECOND DELAY, INDOOR BLOWER IS ENERGIZED ON CONTINUOUS FAN SPEED. THERMOSTAT CALLS FOR FIRST STAGE COOL. THERMOSTAT CALLS FOR FIRST-STAGE HEAT. INDOOR BLOWER RAMPS TO FIRST STAGE AFTER 45-SECOND DELAY, INDOOR BLOWER COOLING SPEED AFTER A 2-SECOND DELAY.

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