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Lennox G60DF series Installation Instructions Manual

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Service Literature
G60DF series units are mid−efficiency gas furnaces used
for downflow applications only, manufactured with Lennox
Duralok Plus heat exchangers formed of aluminized steel.
Units are available in heating capacities of 44,000 to
132,000 Btuh and cooling applications up to 5 tons. Refer
to Engineering Handbook for proper sizing.
Units are factory equipped for use with natural gas. Kits are
available for conversion to LPG operation. G60DF model
units are equipped with the Lennox two−stage integrated
SureLight control. G60DF units meets the California Nitro-
gen Oxides (NO
) Standards and California Seasonal Effi-
x
ciency 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. Pro-
cedures outlined in this manual are presented as a recom-
mendation only and do not supersede or replace local or
state codes. In the absence of local or state codes, the
guidelines and procedures outlined in this manual (except
where noted) are recommendations only and do not consti-
tute code.

TABLE OF CONTENTS

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Parts Identification
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IX Control Board Troubleshooting
Corp. 0210−L3
Revised 08−2007
G60DF(X) SERIES UNITS
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Page 1
G60DF−1 MODEL SHOWN
IMPORTANT
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person-
al injury or loss of life. Installation and service must
be performed by a qualified installer, service agency
or the gas supplier.
WARNING
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at discon-
nect switch(es). Unit may have multiple
power supplies.
WARNING
Sharp edges.
Be careful when servicing unit to avoid sharp edges
which may result in personal injury.
G60DF(X)
© 2002 Lennox Industries Inc.

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Summary of Contents for Lennox G60DF series

  • Page 1: Table Of Contents

    Corp. 0210−L3 Service Literature Revised 08−2007 G60DF(X) SERIES UNITS G60DF series units are mid−efficiency gas furnaces used for downflow applications only, manufactured with Lennox Duralok Plus heat exchangers formed of aluminized steel. Units are available in heating capacities of 44,000 to 132,000 Btuh and cooling applications up to 5 tons.

  • Page 2: Specifications

    SPECIFICATIONS G60DF(X) Models Model No. G60DF−24A−045 G60DF−36A−070 G60DF−36B−090 G60DF−48C−090 Heating Low NO Model No. G60DF−24A−045X G60DF−36A−070X − − − G60DF−48C−090X Performance Input − Btuh (kW) low fire 30,000 (8.8) 45,000 (13.2) 60,000 (17.6) 60,000 (17.6) Output − Btuh (kW) low fire 24,000 (7.0) 36,000 (10.5) 48,000 (14.1)
  • Page 3 SPECIFICATIONS Cont. Model No. G60DF−48C−110 G60DF−60C−110 G60DF−60D−135 Heating Low NO Model No. − − − − G60DF−60C−110X − − − − Performance Input − Btuh (kW) low fire 75,000 (22.0) 75,000 (22.0) 90,000 (26.4) Output − Btuh (kW) low fire 61,000 (17.9) 61,000 (17.9) 73,000 (21.4)

  • Page 4: Blower Data

    SPECIFICATIONS Cont. Model No. G60DF−60C−110 G60DF−60D−135 Heating Low NO Model No. G60DF−60C−110X − − − − Performance Input − Btuh (kW) low fire 75,000 (22.0) 90,000 (26.4) Output − Btuh (kW) low fire 61,000 (17.9) 73,000 (21.4) Input − Btuh (kW) high fire 110,000 (32.2) 132,000 (38.7) Output −...
  • Page 5 BLOWER DATA Cont. G60DF−36A−070 PERFORMANCE Air Volume / Watts at Different Blower Speeds External Static Pressure High Medium−High Medium−Low in. w.g. Watts Watts Watts Watts 0.00 1475 1343 1151 0.05 1449 1321 1139 0.10 1423 1298 1127 0.15 1397 1276 1115 0.20 1371...
  • Page 6 BLOWER DATA Cont. G60DF−48C−090 PERFORMANCE Air Volume / Watts at Different Blower Speeds External Static Pressure High Medium−High Medium−Low in. w.g. Watts Watts Watts Watts 0.00 2039 1852 1595 1325 0.05 1998 1826 1576 1338 0.10 1956 1800 1556 1351 0.15 1921 1770...
  • Page 7 BLOWER DATA Cont. G60DF−60D−135 with 3/4 hp PERFORMANCE Air Volume / Watts at Different Blower Speeds External Static Pressure High Medium−High Medium−Low in. w.g. Watts Watts Watts Watts 0.00 2845 1345 1143 2692 1270 2451 1155 2054 0.05 2774 1310 1128 2628 1240...
  • Page 8 BLOWER DATA Cont. G60DF−60D−135 with 1 hp PERFORMANCE Air Volume / Watts at Different Blower Speeds External Static Pressure High Medium−High Medium−Low in. w.g. Watts Watts Watts Watts 2660 1255 1379 2325 1095 1059 1960 1655 2560 1210 1353 2310 1090 1030 1945...

  • Page 9: Parts Arrangement

    PARTS ARRANGEMENT Blower Motor Blower Assembly Internal Flue Pipe Assembly Gasket Transformer Capacitor Circuit Breaker Flue Chase Door Interlock Switch Gasket Limit ® SureLight Two−Stage Shield Integrated Control Board Flue Box Gasket Primary Heat Exchanger Limit Flue Collector Box Flame Sensor Gasket Flame Rollout Switches* Flame Rollout Bracket...

  • Page 10: I Unit Components

    Board 18M34 the low voltage section of the unit. Transformers on all All G60DF units are equipped with the Lennox two−stage models are rated 40VA with a 120V primary and a 24V sec- integrated SureLight control board. The system consists ondary.
  • Page 11 After the 15−second pre−purge period, the SureLight ignitor warms up for 20 seconds after which the gas valve opens For customized comfort, monitor the supply air tempera- for a 4−second trial for ignition. The ignitor energizes during ture once the heat demand is satisfied. Note the supply air the trial until flame is sensed.
  • Page 12 TABLE 3 TWO−STAGE CONTROL BOARD 18M34 Integrated Control Board Terminals 120VAC Neutral LINE Line XFMR Transformer LEDs Electronic Air Cleaner CIRC Indoor Blower SWITCHES 1 − 4 Humidifier 120VAC Line Humidifier XMFR Transformer LINE Line SENSOR PARK For Unused Leads COOL Cooling Speed Electronic Air Cleaner...
  • Page 13 TABLE 6 DIAGNOSTIC CODES Diagnostic LEDs are labeled DS1 and DS2. See figure or location of diagnostic LEDs. DESCRIPTION Power on − Normal operation. SIMULTANEOUS SIMULTANEOUS Also signaled during cooling and continuous fan. SLOW FLASH SLOW FLASH SIMULTANEOUS SIMULTANEOUS Normal operation − signaled when heating demand initiated at thermostat. FAST FLASH FAST FLASH Primary, secondary or rollout limit switch open.
  • Page 14 After a 60−minute reset period, the control will begin SureLight Board 100869 the ignition sequence again. G60DF units are equipped with the Lennox two−stage in- NOTE − Board 100869 DOES NOT ramp down voltage tegrated SureLight control board. The system consists of to the ignitor.
  • Page 15 DIP Switch Settings air temperature between 90° and 110°F at the exact mo- Switch 1 −− Thermostat Selection −− This unit may be used ment that the blower is de−energized. Longer off delay set- with either a single−stage or two−stage thermostat. The tings provide lower supply air temperatures;...
  • Page 16 DIAGNOSTIC LEDs THERMOSTAT CONNECTIONS (TB1) SWITCHES ON−BOARD LINKS 1= ERROR CODE RECALL H= 24V HUMIDIFIER OUTPUT L= LENNOX SYSTEM OPERATION MONITOR DIP SWITCH FUNCTIONS W915 DIP SWITCH(ES) FUNCTION 1 −− 2 Stage T’stat Selects t/stat type (single or two−stage) W951 2 −−...
  • Page 17 CONTROL BOARD 100869 FIGURE 6 Page 17...
  • Page 18 TABLE 10 FLASH CODE STATUS / ERROR DESCRIPTION (X + Y) FLASH CODE DESCRIPTIONS Pulse A 1/4 second flash followed by four seconds of off time. Heartbeat Constant 1/2 second bright and 1/2 second dim cycles. LED flashes X times at 2Hz, remains off for two seconds, flashes Y times at 2Hz, remains off for four X + Y seconds, then repeats.
  • Page 19 6. Blower Motors and Capacitors 7. Ignitor The SureLight ignitor is made of durable silicon nitride. Ig- All G60DFunits use direct drive blower motors. All motors nitor longevity is enhanced by controlling voltage to the ig- are 120V permanent split capacitor motors to ensure maxi- nitor.
  • Page 20 SureLight Board 18M34 Ignitor Location MEASUREMENT IS TO I.D. OF RETENTION " RING 13/32’ 5/16" BRACKET IGNITOR BURNERS TOP VIEW BURNERS FRONT VIEW FIGURE 8 SureLight Board 100869 Ignitor Location MEASUREMENT IS TO I.D. OF RETENTION RING " 7/32’ 21/64" BURNERS TOP VIEW BRACKET IGNITOR...
  • Page 21 One switch is LPG change over kits are available from Lennox. Kits include located over the leftmost burner and the other switch is lo- burner orifices and a gas valve regulator conversion kit.
  • Page 22 14. Combustion Air Inducer TABLE 12 Prove Switch (S18) 0’ to 4500’ S18 is a dual combustion air proving switch (first and second Set Point High Set Point Low G60DF Unit stage) located on the combustion air inducer orifice bracket. Heat Heat The switch is connected to the combustion air inducer hous-...

  • Page 23: Installation

    II−PLACEMENT AND INSTALLATION HONEYWELL VR8205 Series Gas Valve Make sure unit is installed in accordance with installation MANIFOLD HIGH FIRE PRESSURE ADJUSTMENT instructions and applicable codes. SCREW (under cap) III−START-UP A−Preliminary and Seasonal Checks 1 − Inspect electrical wiring, both field and factory installed lOW FIRE for loose connections.

  • Page 24: Heating System Service Checks

    Use of a specialty Gas Leak Detector is strongly recommended. It is available through Lennox under part number 31B2001. See Corp. 8411−L10, for further details. WARNING Do not use matches, candles, flame or any other source of ignition to check for gas leaks.
  • Page 25 TABLE 15 IMPORTANT All G60DF Units Natural Line Pressure WC" 4.5 − 10.5 11.0 − 13.0 For safety, shut unit off and remove manometer as Manifold Pressure High soon as an accurate reading has been obtained. 10.0 Heat WC" Take care to replace pressure tap plug. Manifold Pressure Low G−...

  • Page 26: Typical Operating Characteristics

    3 − Depending on the type of indoor thermostat, blower #78H5401 available (PART #78H5401) and entire unit will be off when the system switch is in from Lennox Repair OFF position. Parts) is required to measure flame signal if B−Temperature Rise meter used will not read Temperature rise for G60DF units depends on unit input, a low micro amp signal.

  • Page 27: Maintenance

    C−External Static Pressure VI−MAINTENANCE 1 − Tap locations shown in figure 17. WARNING 2 − Punch a 1/4" diameter hole STATIC PRESSURE TEST Disconnect power before servicing unit. in supply and return air ple- nums. Insert manometer CAUTION hose flush with inside edge of hole or insulation.
  • Page 28 2 − Remove the three screws that secure the vent pipe to INSERTS the flue collar. (X models only) 3 − Remove the screw that secures the internal flue pipe to the combustion air inducer. See figure 18. 4 − Scrape away the silicone sealant that is between the internal flue pipe and the combustion air inducer.
  • Page 29 16 −Attach the exhaust end (positive pressure) of the vacu- 25 −Use three screws to resecure the vent pipe to the flue um cleaner to the top of the heat exchanger section. collar. Any loose debris will be forced to the bottom of the heat exchanger section.

  • Page 30: Wiring And Sequence Of Operation

    VII− Wiring and Sequence of Operation A−G60DF−1, −2, −3 with SureLight Board 18M34 Page 30...
  • Page 31 B−G60DF−4, −5 with SureLight Board 18M34 Page 31...
  • Page 32 G60DF Units with SureLight Board 18M34 Single−Stage Thermostat, Two Stage Heat. Jumper E20 set at SINGLE" Sequence depends on type thermostat used. Units are 1− SureLight control energizes combustion air inducer B6 applicable for single stage or two stage thermostats. on low heat speed.
  • Page 33 G60DF Units with SureLight Board 18M34 HEATING SEQUENCE OF OPERATION NORMAL AND ABNORMAL HEATING MODE GAS VALVE OFF. COMBUSTION AIR INDUCER POWER ON OFF. INDOOR BLOWER OFF. CHECK FOR BROKEN IGNITOR OR OPEN IGNITER CIRCUIT. DS1 AND DS2 ALTERNATING FAST FLASH. CONTROL SELF−CHECK OKAY? GAS VALVE OFF.
  • Page 34 HEATING SEQUENCE OF OPERATION CONTINUED THERMOSTAT CALLS FOR HEAT DS1 AND DS2 SIMULTANEOUS FAST FLASH (Refer to box A on previous page) FIRST−STAGE (LOW FIRE) PROVE GAS VALVE OFF. COMBUSTION AIR INDUCER SWITCH CLOSED WITHIN 2.5 MINUTES? OFF. INDOOR BLOWER OFF. UNIT WILL RETRY AFTER 5−MINUTE WAIT PERIOD.
  • Page 35 HEATING SEQUENCE OF OPERATION CONTINUED THERMOSTAT CALLS FOR HEAT. DS1 AND DS2 SIMULTANEOUS FAST FLASH. SEE BOX A. FLAME SIGNAL ABOVE (u0.23 microamps) LOW FLAME SIGNAL (Does not affect control operation) DS1 SLOW FLASH, DS2 FAST FLASH. SINGLE−STAGE THERMOSTAT MODE TWO STAGE THERMOSTAT MODE (E20 SET AT SINGLE") (E20 SET AT TWO")
  • Page 36 HEATING SEQUENCE OF OPERATION CONTINUED SEE BOX A NORMAL OPERATION DS1 AND DS2 SIMULTANEOUS SLOW FLASH. SEE BOX B THERMOSTAT CALLS FOR HEAT DS 1 AND DS 2 SIMULTANEOUS FAST FLASH GAS VALVE OFF. COMBUSTION AIR INDUCER OFF. INDOOR BLOWER ON. IS PRIMARY AND SECONDARY LIMIT DS1 SLOW FLASH, DS2 ON.
  • Page 37 COOLING SEQUENCE OF OPERATION POWER ON IS POLARITY REVERSED? SIGNAL POLARITY REVERSED. DS1 FAST FLASH, DS2 SLOW FLASH. IS THERE IS VOLTAGE PROPER GROUND? ABOVE 75 VOLTS? THERMOSTAT CALLS FOR FIRST−STAGE COOL. COMPRESSOR AND CONDENSER FAN ENERGIZED. INDOOR BLOWER ENERGIZED ON FIRST−STAGE COOL SPEED AFTER 2 SECOND DELAY.
  • Page 38 C−G60DF Units with SureLight Board 100869 Page 38...
  • Page 39 G60DF Units with SureLight Board 100869 Single−Stage Thermostat, Two Stage Heat. Dip Switch set at SINGLE" Sequence depends on type thermostat used. G060DF 1− SureLight control energizes combustion air inducer B6 units are applicable for single stage or two stage ther- on low heat speed.
  • Page 40 G60DF Units with SureLight Board 100869 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. STATUS ERROR CODE 5 + 4. POLARITY OKAY? IS THERE A SIGNAL HOLDS UNTIL UNIT IS PROPERLY GROUNDED.
  • Page 41 HEATING SEQUENCE OF OPERATION CONTINUED THERMOSTAT CALLS FOR HEAT STATUS LED − HEARTBEAT (Refer to box A on previous page) FIRST−STAGE (LOW FIRE) PRESSURE GAS VALVE OFF. COMBUSTION AIR INDUCER SWITCH CLOSED WITHIN 2.5 MINUTES? OFF. INDOOR BLOWER OFF. UNIT WILL RETRY AFTER 5−MINUTE WAIT PERIOD.
  • Page 42 HEATING SEQUENCE OF OPERATION CONTINUED THERMOSTAT CALLS FOR HEAT. STATUS LED −− HEARTBEAT. SEE BOX A. FLAME SIGNAL ABOVE (u1.40 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 SINGLE") (DIP SWITCH SET AT TWO") START SECOND−STAGE RECOGNITION...
  • Page 43 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 44 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 45 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. AFTER 45−SECOND DELAY, INDOOR BLOWER INDOOR BLOWER SWITCHES TO FIRST STAGE SWITCHES TO LOW HEAT SPEED.

  • Page 46: Field Wiring And Jumper Settings

    VIII− Field Wiring & Jumper Settings A−SureLight Board 18M34 Jumper Settings (See figure 4) Thermostat Wiring Connections Term. Strip Y1 to Y2 1 Heat / 1 Cool SINGLE Leave Installed CONTROL OUTDOOR T’STAT TERM. STRIP UNIT NOTE − Use dip switch 3 to set second−stage heat ON delay.
  • Page 47 Jumper Settings (See figure 4) Thermostat Wiring Connections Term. Strip Y1 to Y2 FM21 Heat Pump / 1 SINGLE Leave Intstalled CONTROL FM21 TERM. STRIP Cool *Disconnect existing furnace transformer and re- place with 75VA, 24V trans- former if defrost option to be used.
  • Page 48 B−SureLight Board 100869 TABLE 20 Field Wiring Applications (Continued) Jumper Settings (See figure 5) W915 Two−Stage W951 Thermostat Wiring Connections DIP Switch 1 Cooling Heat Pumps 1Heat / 1 Cool Intact Intact CONTROL OUTDOOR T’STAT TERM. STRIP UNIT NOTE − Use DIP switch 2 to set sec- ond−stage heat ON delay.
  • Page 49 TABLE 21 Field Wiring Applications (Continued) Jumper Settings (See figure 5) W915 Two−Stage W951 Thermostat Wiring Connections DIP Switch 1 Cooling Heat Pumps 2 Heat / 2 Cool Intact CONTROL OUTDOOR T’STAT TERM. STRIP UNIT 2 Heat / 1 Cool Intact Intact CONTROL...
  • Page 50 IX− Integrated Control Board Troubleshooting Guide A−SureLight Board 18M34 UPON INITIAL POWER UP, REMOVE ALL THERMOSTAT DEMANDS TO THE UNIT PROBLEM: 1 UNIT FAILS TO OPERATE IN THE COOLING, HEATING, OR CONTINUOUS FAN MODE Condition Possible Cause Corrective Action / Comments 1.1.1 ACTION 1 −...
  • Page 51 PROBLEM 2: UNIT FAILS TO FIRE IN THE HEATING MODE, COMBUSTION AIR INDUCER DOES NOT ENERGIZE Condition Possible Cause Corrective Action / Comments ACTION 1 − Check continuity across switch(es). Switches reset automatically upon cool down. − Unit operates with a cooling or contin- 2.1.1 Rollout switch must be reset manually.
  • Page 52 PROBLEM 3: UNIT FAILS TO FIRE IN THE HEATING MODE, COMBUSTION AIR BLOWER ENERGIZES, IGNITOR IS NOT ENERGIZED. Condition Possible Cause Corrective Action/Comments 3.1.1 ACTION 1 − Check that the prove switch line is − Unit operates with a cooling and Prove switch does not close due to correctly routed.
  • Page 53 PROBLEM 4: UNIT FAILS TO FIRE IN THE HEATING MODE, COMBUSTION AIR BLOWER ENERGIZES, IGNITOR IS ENERGIZED. Condition Possible Cause Corrective Action/Comments ACTION 1 − Check line pressure at the gas valve. 4.1.1 Pressure should not exceed 13" WC for both nat- −...
  • Page 54 PROBLEM 5: BURNERS LIGHT WITH HEATING DEMAND BUT UNIT SHUTS DOWN PREMATURELY (CONT.) Condition Possible Cause Corrective Action/Comments ACTION 1 − Check that the manifold pressure matches value listed on nameplate. See installa- − Combustion air inducer energizes 5.3.1 tion instructions for proper procedure. with a heating demand.
  • Page 55 PROBLEM 5: BURNERS LIGHT WITH HEATING DEMAND BUT UNIT SHUTS DOWN PREMATURELY (CONT.) − Combustion air inducer energizes ACTION 1 − Check that the sensor is properly lo- 5.5.1 with a heating demand. cated. ACTION 2 − Check that the sense wire is properly Loose sensor wire connection causes −...
  • Page 56 B−SureLight Board 100869 UPON INITIAL POWER UP, REMOVE ALL THERMOSTAT DEMANDS TO THE UNIT PROBLEM: 1 UNIT FAILS TO OPERATE IN THE COOLING, HEATING, OR CONTINUOUS FAN MODE Flash Code Possible Cause Corrective Action / Comments LED X + Y 1.1.1 ACTION 1 −...
  • Page 57 PROBLEM 2: UNIT FAILS TO FIRE IN THE HEATING MODE, COMBUSTION AIR BLOWER DOES NOT ENERGIZE Flash Code Corrective Action / Comments Possible Cause LED X + Y ACTION 1 − Check continuity across switch(es). 2.1.1 Switches reset automatically upon cool down. Unit operates with a cooling or ACTION 2 −...
  • Page 58 PROBLEM 4: UNIT FAILS TO FIRE IN THE HEATING MODE, COMBUSTION AIR INDUCER ENERGIZES, IGNITOR IS NOT ENERGIZED. Flash Code Possible Cause Corrective Action/Comments LED X + Y 4.1.1 ACTION 1 − Check for restricted vent. Remove all blockage. − Unit operates with a cooling and Prove switch does not close due to ACTION 2: Check for proper vent sizing.
  • Page 59 PROBLEM 5: UNIT FIRES ON LOW FIRE, FAILS TO GO TO HIGH FIRE OPERATION Flash Code Possible Cause Corrective Action/Comments LED X + Y 5.1.1 ACTION 1 − Check for restricted vent. Remove all blockage. − Unit light s normally during low fire Prove switch does not close due to ACTION 2: Check for proper vent sizing.
  • Page 60 PROBLEM 6: UNIT FAILS TO FIRE IN THE HEATING MODE, COMBUSTION AIR BLOWER ENERGIZES, IGNITOR IS ENERGIZED. Flash Code Possible Cause Corrective Action/Comments LED X + Y ACTION 1 − Check line pressure at the gas valve. 6.1.1 Pressure should not exceed 13" WC for both nat- Unit operates with a cooling and ural and propane.
  • Page 61 PROBLEM 7: BURNERS LIGHT WITH HEATING DEMAND BUT UNIT SHUTS DOWN PREMATURELY (CONT.) Flash Code Possible Cause Corrective Action/Comments LED X + Y ACTION 1 − Check that the manifold pressure matches value listed on nameplate. See installa- Combustion air inducer energizes 7.3.1 tion instructions for proper procedure.
  • Page 62 PROBLEM 7: BURNERS LIGHT WITH HEATING DEMAND BUT UNIT SHUTS DOWN PREMATURELY (CONT.) Flash Code Possible Cause Corrective Action/Comments LED X + Y ACTION 1 − Check that the sensor is properly lo- Combustion air inducer energizes 7.5.1 cated. with a heating demand. ACTION 2 −...

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G60dfx seriesG60df−24a−045G60df−36a−070G60df−36b−090G60df−48c−090G60df−24a−045x ... Show all

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