Honeywell CT3455 Owner's Manual - Page 16

HEAT OFF COOL FAN ON AUTO Move the system switch to OFF and the fan switch to ON. The fan should run continuously. When the fan switch is in the AUTO position, fan cycles with the heating or cooling system. 27 69-0733-3 STEP 11 Set The Fan And System Switches First set the fan switch. FAN ON: The fan runs continuously. Use for improved air circulation during special occasions or for more efficient electronic air cleaning. (In a heat-only system, fan runs continuously only if fan relay is connected to the thermostat.) FAN AUTO: Normal setting for most homes. A single-speed fan turns on automatically with the air conditioner or furnace. A twospeed fan usually runs on high with the air conditioner and on low with the furnace. Exception: If fan operation switch on back of thermostat is set to the ELEC (right) position (see page 20), fan operates with furnace only. FAN ON AUTO FAN ON AUTO 28 69-0733-3