Honeywell CT3600 Owner's Manual - Page 19

Usage Key ❑ Press Usage once to display the hours and minutes that the heating or cooling system has been operating for the current day. ❑ Press Usage a second time to display the system operating time for the previous day (midnight to midnight). ❑ Press Usage a third time to display the system operating time since the last time the usage function was cleared. NOTE: Press Usage for three seconds to clear the usage function. STEP 12. SET THE FAN AND SYSTEM SWITCHES First set the fan switch. Then set the system switch. Fan On: The fan runs continuously. Use for improved air circulation or for more efficient central air cleaning. (In a heat-only system, fan runs continuously only if fan relay is connected to the G thermostat terminal). Fan Auto: Normal setting for most homes. The equipment controls the fan operation. Heat: The thermostat controls your heating system. Off: Both the heating and air conditioning systems are off. Cool: The thermostat controls your air conditioning system. On Fan On Fan Heat Off System Heat Off System Heat Off System Auto Auto Cool Cool Cool 19 69-1642