Lennox International Inc G24-200 installation instructions Temperature Rise

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Temperature Rise

Temperature Rise

Check the temperature rise and, if necessary, adjust the blower speed to maintain the temperature rise within the range shown on the unit rating plate.

Electro-mechanical Thermostat Heat Anticipation

In single-stage heat applications, set the heat anticipation to 0.2 amps.

In two-stage heat applications, set the heat anticipation to

0.26amps and install a field-provided resistor (150 ohm, 10 watt rating −Lennox part number P−8−6256) in parallel with K13 relay coil.

Electrical

1 − Check all wiring for loose connections.

2 − Check for the correct voltage at the furnace (furnace operating).

3 − Check amp-draw on blower motor. Motor service factor amps

Nameplate __________Actual__________

Flue And Chimney

1 − Check flue pipe, chimney and all connections for tight- ness and to make sure there is no blockage.

2 − Check unit for proper draft.

3 − Are pressure switches closed? Obstructed flue will open pressure switches and cause unit to shut down. Check flue and outlet for blockages.

4 − Reset manual flame rollout switches on burner box covers.

Burner Flame Adjustment

The G24−200 burner flame is not adjustable; however, the flame should be inspected at the beginning of each heating season. If necessary, clean the burners. Burner flame should be blue when burning natural gas. See figure 21.

BURNER FLAME

FLAME

FLAME APPEARS

 

BLUE IF BURNING

 

NAT. GAS.

HEAT

 

 

EXCHANGER

BURNER

TUBE

 

VEST

PANEL

FIGURE 21

Failure To Operate

If unit fails to operate check the following: 1 − Is the thermostat calling for heat?

2 − Are access panels securely in place?

3 − Is the main disconnect switch closed?

4 − Is there a blown fuse or tripped circuit breaker?

5 − Are the filters dirty or plugged? Dirty or plugged filters will cause the limit controls to shut the unit off.

6 − Is gas turned on at the meter?

7 − Is the manual main shut-off valve open?

8 − Are the internal manual shut-off valves open?

9 − Are the unit ignition systems in lock out mode? If unit locks out again, call serviceman to inspect unit for block- ages.

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Contents INSTALLATION INSTRUCTIONS G24-200 2P0805P504613M WHAT TO DO IF YOU SMELL GASG24−200 Unit Dimensions − inches mm PageG24−200 Filter Box Dimensions − inches mm SIDE VIEWBACK VIEW TOP VIEWG24−200 Parts Arrangement G24−200 HEAT SECTION AND CABINETPage G24−200 Parts Arrangement Continued G24−200 BLOWER SECTIONPage Safety G24−200 Gas FurnaceShipping and Packing List setting General Combustion, Dilution & Ventilation AirCements and glues EQUIPMENT IN CONFINED SPACE ALL AIR FROM INSIDE Setting Equipment Return Air Plenum / Filter Box InstallationBOTTOM RETURN AIR FILTER BOX INSTALLATION PageBlower Motor / Drive Installation Duct SystemVenting Venting Using a Masonry Chimney Page Page SERVING A SINGLE CATEGORY I APPLIANCE PageSERVING A SINGLE CATEGORY I APPLIANCE PageVENT CONNECTOR CAPACITY SERVING TWO OR MORE CATEGORY I APPLIANCESSERVING TWO OR MORE CATEGORY I APPLIANCES COMMON VENT CAPACITYPage CARBON MONOXIDE POISONING HAZARD FOR INSTALLATIONS IN THE USA AND CANADA VENT TERMINATION CLEARANCESPage Horizontal Venting Gas Piping FIRE OR EXPLOSION HAZARD Electrical G24−200 FIELD WIRING DIAGRAM 120V SINGLE PH 60HZ Alternate make-upbox right side Alternate make-upG24-200FIELD WIRING DIAGRAM G24−200 FIELD WIRING DIAGRAM G UNITS − 460V 3PH 60HZJ UNITS − 575V 3PH 60HZ Alternate make-upFIGURE Page WIRING SCHEMATIC DIAGRAM FOR G24−200 P UNITS − 208/230V 1PH 60 HZY UNITS − 208/230V 3PH 60HZ G UNITS − 460V 3PH 60HZUnit Start−Up Heating Sequence of Operation Gas Pressure Adjustment Other Unit Adjustments and OperationHigh Altitude Information Temperature Rise Setting blower CFM TABLE ACCESSORY AIR RESISTANCE TABLE DRIVE KIT SPECIFICATIONSPage Repair Parts List G24−200 Start−up and Performance Check ListTroubleshooting NORMAL HEATING MODEABNORMAL HEATING MODE Page3 − OFF NO POWER OR DETECTED FAULT NORMAL HEATING MODEABNORMAL HEATING MODE LED CODESPOWER ON THERMOSTAT CALLS FOR HEAT W1 ENERGIZED IS THE S10 S99 HIGH LIMIT CLOSED? YES COOLING SEQUENCE OF OPERATION FOR TWO CONDENSING UNITSFOR A SINGLE CONDENSING UNIT MANUAL FAN OPERATION