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 SECOND−STAGE HEAT<br />
2<br />
CALL FOR 2ND STAGE HEAT<br />
(HIGH FIRE)<br />
1<br />
2 STAGE THERMOSTAT<br />
SINGLE STAGE<br />
THERMOSTAT<br />
2<br />
RECOGNITION DELAY<br />
(30 SECONDS)<br />
ONLY FOR 1ST EXPIRED?<br />
REQUEST FOR<br />
2ND STAGE HEAT<br />
YES<br />
YES<br />
2ND STAGE<br />
ON DELAY<br />
EXPIRED?<br />
INDUCER SWITCHED<br />
TO HIGH SPEED<br />
HIGH<br />
PRESSURE SWITCH<br />
CLOSED WITHIN 10<br />
SECONDS?<br />
NO<br />
INDUCER SWITCHED<br />
TO LOW SPEED<br />
5 MINUTE DELAY<br />
(ERROR CODE FLASHES)<br />
3<br />
YES<br />
2ND STAGE GAS VALVE<br />
ENERGIZED<br />
INDOOR BLOWER ENERGIZED<br />
ON HIGH HEAT SPEED<br />
3<br />
CALL FOR HEAT SATISFIED<br />
1<br />
2<br />
SYSTEM WILL ALWAYS LIGHT ON LOW FIIRE, EVEN IF 2ND STAGE HEAT IS IN PLACE.<br />
WHEN USED WITH A SINGLE STAGE THERMOSTAT, SET SW1 TO THE ON POSITION IN DIP SWITCH S4.<br />
3<br />
IF THE HIGH FIRE PRESSURE SWITCH DOES NOT CLOSE WITHIN 5 ATTEMPTS, THE SYSTEM WILL OPERATE AT<br />
LOW FIRE FOR THE REMAINDER OF THE CALL FOR HEAT REQUEST.<br />
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