Lennox International Inc G24-200 Normal Heating Mode, Abnormal Heating Mode, Led Codes, Page

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LED CODES

HEATING SEQUENCE OF OPERATION WITH TWO-STAGE THERMOSTAT CONTINUED

NORMAL HEATING MODE

ABNORMAL HEATING MODE

IS THE S10 (S99) HIGH LIMIT CLOSED?

YES

HAS ROOM AIR TEMPERATURE CONTINUED

TO DROP BELOW THE THERMOSTAT"S

W2 SET POINT?

NO

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

RELAYS MAINTAIN BLOWER OPERATION.

YES

POWER FROM W2

ENERGIZES K19 RELAY

SECOND-STAGE OF GV1 (GV3)

GAS VALVE ENERGIZED (HIGH HEAT)

AFTER APPROXIMATELY 3 SEC.

IS W2 DEMAND SATISFIED?

YES

CLOSE SECOND-STAGE OF GV1 (GV3) GAS VALVE AFTER APPROXIMATELY 3 SEC. AND THEN RETURN TO LOW HEAT OPERATION.

NO

IS W1 DEMAND SATISFIED?

YES

A3 (A12) LED OFF

FIRST-STAGE OF GV1 (GV3)

GAS VALVE CLOSES.

B6 (B15) COMBUSTION

AIR BLOWER OFF.

B3 SYSTEM BLOWERS OFF

AFTER 150 SEC DELAY.

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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Contents 2P0805 INSTALLATION INSTRUCTIONS G24-200P504613M WHAT TO DO IF YOU SMELL GASPage G24−200 Unit Dimensions − inches mmSIDE VIEW G24−200 Filter Box Dimensions − inches mmBACK VIEW TOP VIEWPage G24−200 Parts ArrangementG24−200 HEAT SECTION AND CABINET Page G24−200 Parts Arrangement ContinuedG24−200 BLOWER SECTION Shipping and Packing List SafetyG24−200 Gas Furnace 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 APPLIANCESERVING TWO OR MORE CATEGORY I APPLIANCES VENT CONNECTOR CAPACITYSERVING TWO OR MORE CATEGORY I APPLIANCES COMMON VENT CAPACITYPage CARBON MONOXIDE POISONING HAZARD Page FOR INSTALLATIONS IN THE USA AND CANADAVENT TERMINATION CLEARANCES Horizontal Venting Gas Piping FIRE OR EXPLOSION HAZARD Electrical Alternate make-up G24−200 FIELD WIRING DIAGRAM 120V SINGLE PH 60HZbox right side Alternate make-upG24-200FIELD WIRING DIAGRAM G UNITS − 460V 3PH 60HZ G24−200 FIELD WIRING DIAGRAMJ UNITS − 575V 3PH 60HZ Alternate make-upFIGURE Page P UNITS − 208/230V 1PH 60 HZ WIRING SCHEMATIC DIAGRAM FOR G24−200Y UNITS − 208/230V 3PH 60HZ G UNITS − 460V 3PH 60HZUnit Start−Up Heating Sequence of Operation High Altitude Information Gas Pressure AdjustmentOther Unit Adjustments and Operation Temperature Rise Setting blower CFM Page TABLE ACCESSORY AIR RESISTANCETABLE DRIVE KIT SPECIFICATIONS G24−200 Start−up and Performance Check List Repair Parts ListNORMAL HEATING MODE TroubleshootingABNORMAL HEATING MODE PageNORMAL HEATING MODE 3 − OFF NO POWER OR DETECTED FAULTABNORMAL HEATING MODE LED CODESPOWER ON THERMOSTAT CALLS FOR HEAT W1 ENERGIZED IS THE S10 S99 HIGH LIMIT CLOSED? YES FOR TWO CONDENSING UNITS COOLING SEQUENCE OF OPERATIONFOR A SINGLE CONDENSING UNIT MANUAL FAN OPERATION