Controlling The Fan Operation - Lennox L7742U Programming And Application Manual

Controlling the Fan Operation

Press the screen anywhere − the first press turns on the backlight.
From the HOME screen press FAN field; repeated presses
scroll through all the modes, AUTO, ON, and CIRC
(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 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.
S
If FAN mode displays CIRC 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 depen-
dant on user settings FAN CIRCULATE (Page 11).
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 11]):
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 11). If set to AUTO, the fan will come on
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 11). When FAN − AUTO is selected in the
HOME screen, the schedule IS followed.
Controlling the Schedule
Press the screen anywhere − the first press turns on the backlight.
From the HOME screen press SCHED; repeated presses
toggle the schedule ON and OFF. If ON, the system follows
the program developed by the user (Page 8). If OFF, the
system operates as a non−programmable thermostat the
user must
autochangeover feature will continue to operate based on the
manual user inputs.
ComfortSenset Model L7742U Touch Screen 7−Day Programmable Thermostat
Page 7
make changes when desired. The