Lennox EL296DFE Series Manual
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Lennox EL296DFE Series Manual

Lennox EL296DFE Series Manual

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S e r v i c e L i t e r a t u r e
EL296DFE series units are high efficiency condensing
gas furnaces used for downflow applications only, manu-
factured with Lennox Duralok heat exchangers formed of
aluminized steel. EL296DFE 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. EL296DFE
model units are equipped with the SureLight
constant torque integrated control. EL296DFE 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 6
II Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 22
III Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 45
IV Heating System Service Checks . . . . . . . . . Page 46
V Typical Operating Characteristics . . . . . . . . . Page 49
VI Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . Page 50
VIII Field Wiring and Jumper Settings . . .
X Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . Page 60
UNIT INFORMATION
UNIT INFORMATION
Corp 1247-L10
Revised 06/2021
EL296DFE SERIES UNITS
two-stage
®
. . . . Page 56
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.
EL296DFE
adjustment,
alteration,
©2016 Lennox Industries, Inc.

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  • Page 1: Table Of Contents

    S e r v i c e L i t e r a t u r e Revised 06/2021 EL296DFE SERIES UNITS EL296DFE series units are high efficiency condensing gas furnaces used for downflow applications only, manu- factured with Lennox Duralok heat exchangers formed of aluminized steel.

  • Page 2: Specifications

    SP ECIF ICATIONS Model No. EL296DF045XE36B EL296DF070XE48B EL296DF090XE48CEL296DF110XE60C Heating AHRI Ref. No. 5625722 5625723 5940633 5625725 Performance AFUE High Input - Btuh 44,000 66,000 88,000 110,000 Fire Output - Btuh 43,000 64,000 85,000 106,000 Temperature rise range - °F 35-65 35-65 40-70 45-75...
  • Page 3 OPT IONAL AC C ESSORIES - ORD ER SEPARAT ELY “B” Width Models “C” Width Models CABINET ACCESSORIES Downflow Combustible Flooring Base 11M60 11M61 High Performance Economizer (Commercial Only) 10U53 10U53 CONTROLS Blower Relay Kit (for two-stage outdoor units) 85W66 85W66 Furnace Twinning Kit 16W72...

  • Page 4: Blower Performance Data

    B LO WE R DATA EL296DF045XE36B 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 1395 1290 1190 0.10 1375 1245...
  • Page 5 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 6: I Unit Components

    I-UNIT COMPONENTS CIRCUIT BREAKER CB8 EL296DFE unit components are shown in figure 1. The gas valve, combustion air inducer and burners can be ac- cessed by removing the access panel. Electrical compo- PRESS TO RESET nents are in the control box (figure 2) found in the blower section.
  • Page 7 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 8 INTEGRATED CONTROL 24VAC Indoor Ignitor and Combustion Blower Terminals 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 HI HEAT 24VAC...
  • Page 9 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 10 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 11 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 12 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 13 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 14 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 15 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 16 Multi−Meter (set to VAC) Multi−Meter (set to VAC) Test 1 Test 3 (if necessary) Turn on power to unit. Check for 120 volts across terminals Check for 120 volts across terminals “L1” and “Neutrals” on “L” and “N” on input plug P48. If voltage is present continue the integrated control.
  • Page 17 Replacing the Motor Module Motor Test 1 - Disconnect electrical power to unit. 2 - Remove unit access panel. 3 - Unplug the two harnesses from the motor control module. See figure 9. Unplug the Two Harness Connection TWO HARNESS CONNECTIONS MOTOR MOTOR CONTROL MODULE...
  • Page 18 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 19 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 14 Page 19...
  • Page 20 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 21 7. Combustion Air Inducer (B6) and Cold End Header Set points vary depending on unit size. See table 11. Both pressures sensed by the switches are negative relative to atmospheric pressure. If the inlet or exhaust pipes, or All units use a two-speed combustion air inducer to move the heat exchanger become obstructed, the switch sens- air through the burners and heat exchanger during heating es the loss of differential pressure and opens the circuit to...

  • Page 22: Installation

    II-PLACEMENT AND INSTALLATION IMPORTANT All pipe, fittings, primer and solvent cement must conform Exhaust and intake connections are made of PVC. with American National Standard Institute and the Ameri- Use PVC primer and solvent cement when using can Society for Testing and Materials (ANSI/ASTM) stan- PVC vent pipe.
  • Page 23 9 - Use a utility knife to cut out the cabinet insulation Patch Plate Top Cap for the right side vent / air intake. 10 -Install the two 90° street elbows (provided) through the side of the Sheet Metal cabinet. The male side of each elbow should extend Patch Plate down through the blower deck and connect to the rubber fittings below.
  • Page 24 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 25 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 26 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 27 FIGURE 22 Do not use screens or perforated metal in exhaust or NOTE - Lennox offers a glueless vent adapter kit 17H92 intake terminations. Doing so will cause freeze-ups and as an option for exhaust exiting at the furnace top cap may block the terminations.
  • Page 28 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 29 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 30 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 31 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 32 EQUIPMENT IN CONFINED SPACE Intake Piping (Inlet Air from Ventilated Crawlspace and Outlet Air to Outside) The EL296DFE 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 33 The EL296DFE 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 34 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 35 ‡ Permitted only if veranda, porch, deck or balcony is fully open on a minimum of two sides beneath the floor. Lennox recommends avoiding this location if possible. FIGURE 31...
  • Page 36 ‡ Permitted only if veranda, porch, deck or balcony is fully open on a minimum of two sides beneath the floor. Lennox recommends avoiding this location if possible. FIGURE 32 Page 36...
  • Page 37 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 38 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 least one 12” EXHAUST bracket must be used within 6” from the top of the (305mm) VENT 5-1/2”...
  • Page 39 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 40 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 41 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 42 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 43 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 44 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 45: 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 46: 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. See Corp. 8411-L10, for further details. in table 21 below. If manifold pressure matches table 24 and rate is incorrect, check gas orifices for proper size and restriction.
  • Page 47 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 48 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 54. This voltage should be in the range mance.

  • Page 49: Typical Operating Characteristics

    V-TYPICAL OPERATING CHARACTERISTICS C-External Static Pressure 1 - 1 - Tap locations shown in figure 56. 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 50: 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 51 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 52 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 53: Wiring And Sequence Of Operation

    TYPICAL EL296DFE WIRING DIAGRAM Page 53...
  • Page 54 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 55 Applications Using A Single-Stage Thermostat See 4 - After the 20-second warm-up period has ended, figure 59 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 56 VIII- EL296DFE 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 57 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 58 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 59 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 60: 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 61 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 62 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 63 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 64 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 65 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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