SL280DFV Gas Furnace Installation Manual - Lennox
SL280DFV Gas Furnace Installation Manual - Lennox
SL280DFV Gas Furnace Installation Manual - Lennox
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Troubleshooting: Heating Sequence of Operation (Continued)<br />
CALL FOR HEAT SATISFIED<br />
FIRST−STAGE HEAT<br />
SECOND−STAGE HEAT<br />
2 3<br />
RUN MODE:<br />
1ST OR 2ND STAGE CALL FOR HEAT.<br />
ALL INPUTS MONITORED (LIMIT, PRESSURE,<br />
CALL FOR HEAT/COOL, FLAME LEVEL)<br />
2ND STAGE HEAT<br />
NO<br />
2ND STAGE<br />
CALL FOR HEAT<br />
SATISFIED?<br />
YES<br />
DE−ENERGIZE 2ND STAGE<br />
GAS VALVE<br />
INDUCER SPEED SWITCHED<br />
TO LOW SPEED<br />
INDOOR BLOWER SWITCHED<br />
TO LOW HEAT SPEED<br />
1ST STAGE HEAT<br />
NO<br />
1ST STAGE<br />
CALL FOR HEAT<br />
SATISFIED?<br />
YES<br />
GAS VALVE<br />
DE−ENERGIZED<br />
INDUCER OFF AFTER<br />
5 SECOND POST PURGE<br />
INDOOR BLOWER OFF<br />
AFTER FIELD SELECTABLE<br />
OFF DELAY<br />
1<br />
Page 58
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