Lennox G61MPVT-36B-070 Installation Instructions Manual page 49

Troubleshooting: Cooling Sequence of Operation
THERMOSTAT CALLS FOR FIRST−STAGE COOL.
COMPRESSOR AND CONDENSER FAN
INDOOR BLOWER ENERGIZED ON FIRST STAGE
COOL SPEED AFTER 2 SECOND DELAY.
FIRST−STAGE DEMAND FOR COOL SATISFIED?
THERMOSTAT CALLS FOR SECOND−STAGE COOL.
INDOOR BLOWER RAMPS UP TO SECOND−STAGE COOL SPEED.
SECOND−STAGE DEMAND FOR COOL SATISFIED?
UNIT RETURNS TO FIRST STAGE COOL .
COOLING SEQUENCE OF OPERATION
POWER ON
IS POLARITY REVERSED?
NO
IS THERE
PROPER GROUND?
YES
ENERGIZED.
NO
YES
YES
CONTROL WILL CONTINUE TO CALL FOR COOLING
SIGNAL IMPROPER GROUND AT LED.
NO
CONTROL WILL CONTINUE TO CALL FOR COOLING
YES
COMPRESSOR AND CONDENSER FAN DE−ENERGIZED.
INDOOR BLOWER DE−ENERGIZED AFTER 45−SECOND
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SIGNAL POLARITY REVERSED.
IN THIS CONDITION.
STATUS ERROR CODE 5 + 4.
IN THIS CONDITION.
STATUS ERROR CODE 5 + 3.
DELAY.