Troubleshooting: Continuous Fan Sequence of Operation

CONTINUOUS HEAT SPEED FAN SEQUENCE OF OPERATION

LED: SLOW FLASH RATE REMAINS

UNCHANGED THROUGHOUT SEQUENCE.

MANUAL FAN SELECTION MADE AT THERMOSTAT. CONTROL (G) ENERGIZES SYSTEM FAN AT HEAT SPEED. EAC TERMINAL IS ENERGIZED.

THERMOSTAT CALLS FOR HEAT (W).

NOYES

HUM TERM. ENERGIZES WITH COMB. AIR INDUCER.

THERMOSTAT CALLS FOR COOLING.

YES

NO

 

SYSTEM FAN SWITCHED TO COOL SPEED.

EAC TERM. REMAINS ON.

THERMOSTAT OPENS.

MANUAL FAN SELECTION MADE AT THERMOSTAT. CONTROL (G) ENERGIZES SYSTEM FAN AT HEAT

SPEED. EAC TERM. ENERGIZED.

SYSTEM FAN REMAINS ON

HEATING SPEED.

THERMOSTAT OPENS.

HUM TERM. DE−ENERGIZES WITH COMB. AIR INDUCER

SYSTEM FAN REMAINS ON

HEATING SPEED.

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Lennox International Inc ML193DF installation instructions Troubleshooting Continuous Fan Sequence of Operation