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Lennox International Inc G24-200 installation instructions IS THE S10 S99 HIGH LIMIT CLOSED? YES

Models: G24-200

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HEATING SEQUENCE OF OPERATION WITH SINGLE-STAGE THERMOSTAT CONTINUED

NORMAL HEATING MODE

IS THE S10 (S99) HIGH LIMIT CLOSED?

YES

IS W1 DEMAND OF

THERMOSTAT SATISFIED?

YES

A3 (A12) LED OFF

SECOND-STAGE OF GV1 (GV3)

GAS VALVE CLOSES AFTER APRROXIMATELY 3 SEC. AND THEN FIRST-STAGE CLOSES.

B6 (B15) COMBUSTION

AIR BLOWER OFF.

B3 SYSTEM BLOWERS OFF

AFTER 150 SEC DELAY.

NO

ABNORMAL HEATING MODE

DETERMINE WHY AUTOMATIC-RESET S10 (S99) HIGH LIMIT OPEN. K20, (K123), K36

RELAYS MAINTAIN BLOWER OPERATION.

NOTE − IF ECONOMIZER INSTALLED, ECONOMIZER OPERATES WHEN BLOWER POWERED.

LED CODES

1 − ON NORMAL OPERATION WITH THERMOSTAT CALLING FOR HEAT. 2 − 0.5 SEC ON AND 2.5 SECS OFF IN IGNITION RETRY PERIOD.

3 − OFF NO POWER OR DETECTED FAULT.

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Lennox International Inc G24-200 installation instructions IS THE S10 S99 HIGH LIMIT CLOSED? YES

Contents

WHAT TO DO IF YOU SMELL GAS INSTALLATION INSTRUCTIONS G24-2002P0805 P504613MPage G24−200 Unit Dimensions − inches mmTOP VIEW G24−200 Filter Box Dimensions − inches mmSIDE VIEW BACK VIEWG24−200 HEAT SECTION AND CABINET G24−200 Parts ArrangementPage G24−200 BLOWER SECTION G24−200 Parts Arrangement ContinuedPage G24−200 Gas Furnace SafetyShipping and Packing List setting Combustion, Dilution & Ventilation Air GeneralCements and glues EQUIPMENT IN CONFINED SPACE ALL AIR FROM INSIDE Return Air Plenum / Filter Box Installation Setting EquipmentPage BOTTOM RETURN AIR FILTER BOX INSTALLATIONDuct System Blower Motor / Drive InstallationVenting Venting Using a Masonry Chimney Page Page Page SERVING A SINGLE CATEGORY I APPLIANCEPage SERVING A SINGLE CATEGORY I APPLIANCECOMMON VENT CAPACITY VENT CONNECTOR CAPACITYSERVING TWO OR MORE CATEGORY I APPLIANCES SERVING TWO OR MORE CATEGORY I APPLIANCESPage CARBON MONOXIDE POISONING HAZARD VENT TERMINATION CLEARANCES FOR INSTALLATIONS IN THE USA AND CANADAPage Horizontal Venting Gas Piping FIRE OR EXPLOSION HAZARD Electrical Alternate make-up G24−200 FIELD WIRING DIAGRAM 120V SINGLE PH 60HZAlternate make-up box right sideG24-200FIELD WIRING DIAGRAM Alternate make-up G24−200 FIELD WIRING DIAGRAMG UNITS − 460V 3PH 60HZ J UNITS − 575V 3PH 60HZFIGURE Page G UNITS − 460V 3PH 60HZ WIRING SCHEMATIC DIAGRAM FOR G24−200P UNITS − 208/230V 1PH 60 HZ Y UNITS − 208/230V 3PH 60HZUnit Start−Up Heating Sequence of Operation Other Unit Adjustments and Operation Gas Pressure AdjustmentHigh Altitude Information Temperature Rise Setting blower CFM TABLE DRIVE KIT SPECIFICATIONS TABLE ACCESSORY AIR RESISTANCEPage G24−200 Start−up and Performance Check List Repair Parts ListPage TroubleshootingNORMAL HEATING MODE ABNORMAL HEATING MODELED CODES 3 − OFF NO POWER OR DETECTED FAULTNORMAL HEATING MODE ABNORMAL HEATING MODEPOWER ON THERMOSTAT CALLS FOR HEAT W1 ENERGIZED IS THE S10 S99 HIGH LIMIT CLOSED? YES MANUAL FAN OPERATION COOLING SEQUENCE OF OPERATIONFOR TWO CONDENSING UNITS FOR A SINGLE CONDENSING UNIT