Controlling The Fan Operation - Lennox L7742U Owner's Manual

Controlling the Fan Operation

Press the screen anywhere − the first press turns on the backlight.
From the HOME screen press the FAN field;
repeated presses scroll through all the modes,
AUTO, ON, and CIRCulate.
Fan Modes
Fan Modes (ON, AUTO and CIRC) can be changed either from HOME
screen or from the SCHEDULE screen when programming the thermo-
stat. The three settings work like this:
S
If FAN mode displays AUTO on the HOME screen, this means
that the FAN is following the schedule.
S
If FAN mode displays ON on the HOME screen, this means that
the fan is NOT following the schedule and that the fan will run con-
tinuously until it is changed from the HOME screen.
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If FAN mode displays CIRC (circulate) on the HOME screen, this
means that the fan is NOT following the schedule and that the fan
will cycle during periods of equipment inactivity. The cycle time is
dependant on user settings FAN CIRCULATE (Page 10).
506062−01 06/08
If FAN mode displays AUTO (HOME) and ON or CIRC was selected
during scheduling for the current period, the thermostat will indicate the
current fan mode in the information display (FAN ON or FAN CIRC).
In the CIRC mode, the user can cycle the fan for a programmed
percentage of active time per hour, during periods of equipment
inactivity (i.e., heating or cooling equipment not running). The fan is ON
for 5 minutes at a time. The user may change the percentage of ON time
that the fan is on (see FAN CIRCULATE [Page 10]):
Fan Program
The user can program the fan to be ON, AUTO, or CIRC during a
program event period. While scheduling the event, if the fan is set to
ON, it will remain on during the entire event. If it is set to CIRC, it will
circulate during equipment inactivity per user programmable cycles
(see FAN CIRCULATE, Page 10). If set to AUTO, the fan will come with
the equipment to serve the heating/cooling demand and go off
accordingly. Using the fan continuously or circulating the fan during the
occupied times may better improve the indoor air quality.
NOTE − When the HOME screen FAN mode is changed to ON or CIRC,
whatever was scheduled is ignored − the fan will either be ON or it will
CIRCULATE per the user−programmed intervals (USER SETTINGS −
FAN CIRCULATE [Page 10]). When FAN − AUTO is selected in the
HOME screen, the schedule IS followed.
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