INSTALLATION INSTRUCTIONS - Lennox
INSTALLATION INSTRUCTIONS - Lennox
INSTALLATION INSTRUCTIONS - Lennox
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Troubleshooting: Cooling Sequence of Operation<br />
COOLING SEQUENCE OF OPERATION<br />
NORMAL COOLING MODE<br />
ABNORMAL COOLING MODE<br />
POWER ON<br />
IGNITION CONTROL MAIN POWER ON.<br />
CONTROL SELF DIAGNOSTIC CHECK.<br />
IS CONTROL OPERATING NORMALLY?<br />
YES<br />
IS THERE A PROPER GROUND?<br />
YES<br />
IS POLARITY CORRECT?<br />
YES<br />
IS VOLTAGE<br />
ABOVE 90 VOLTS?<br />
YES<br />
ROLLOUT SWITCH MONITORED CONTINUOUSLY.<br />
IS ROLLOUT SWITCH CLOSED?<br />
YES<br />
NO<br />
NO<br />
NO<br />
NO<br />
NO<br />
GAS VALVE OFF. COMBUSTION AIR INDUCER OFF.<br />
INDOOR BLOWER OFF WITH NORMAL DELAY.<br />
SIGNAL CIRCUIT BOARD FAILURE AT LED.<br />
INTERRUPT MAIN POWER TO RESET CONTROL.<br />
SIGNAL IMPROPER GROUND AT LED.<br />
CONTROL WILL CONTINUE TO CALL FOR COOLING<br />
IN THIS CONDITION.<br />
SIGNAL POLARITY REVERSED AT LED. CONTROL<br />
WILL CONTINUE TO CALL FOR COOLING IN THIS<br />
CONDITION.<br />
LED SIGNALS LOW VOLTAGE. CONTROL WILL<br />
CONTINUE TO CALL FOR COOLING<br />
IN THIS CONDITION.<br />
GAS VALVE OFF. COMBUSTION AIR INDUCER ON.<br />
INDOOR BLOWER ON.<br />
SIGNAL ROLL-OUT SWITCH OPEN AT LED.<br />
SEQUENCE HOLDS UNTIL ROLLOUT SWITCH CLOSES<br />
AND MAIN POWER IS INTERRUPTED OR THERMOSTAT<br />
IS CYCLED OFF/ON FOR 1 SEC. MINIMUM.<br />
LED: SLOW FLASH RATE REMAINS UNCHANGED<br />
THROUGHOUT COOLING CYCLE.<br />
THERMOSTAT CALLS FOR COOLING.<br />
COMPRESSOR CONTACTOR AND SYSTEM FAN<br />
ENERGIZED WITH 2-SECOND DELAY<br />
(COOLING SPEED). EAC TERM. ENERGIZED.<br />
THERMOSTAT OPENS.<br />
COMPRESSOR OFF.<br />
SYSTEM FAN AND EAC TERM. OFF<br />
WITH 0-SECOND DELAY.<br />
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