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change of clean your air filter. The
factory set interval for CHNG FLTR
to be displayed is 200 hours of fan
operation. This can be set anywhere
from 0 to 1975 hours in 25 hour
increments. A selection of OFF will
cancel this feature. When CHNG
FLTR is displayed, you can clear it by
pressing the SERVICE button. This
resets the timer and starts counting the
hours until the next filter change. The
following steps will allow you to
change the number of hours for filter
change-out.
1. If you see CHNG FLTR on the
display, press the SERVICE button
once to reset the timer. If you do not
see CHNG FLTR proceed to step 2.
When the SERVICE button is pressed
twice, the display will show the
number of hours remaining before
CHNG FLTR indicator will display.
2. Press the SERVICE button. The
display will show SET FILTER TIME
and will show the number of hours to
filter change.
3. Press TIME
FWD
or TIME
BACK
to change the time to your requirements.
4. Press PROGRAM
RUN
to return
to the normal operating mode. NOTE:
If unsure what interval to use between
filter changes or cleaning, contact the
manufacturer of your heating/cooling
equipment.
UV Bulb Replacement Indicator.
This feature allows the thermostat to
display the words CALL SERV UV
(Call for Service of UV bulb) after a
set time of UV bulb operation. This is
a reminder to maintain your UV system
at optimum level of operation. When
enabled the factory set interval for
CALL SERV UV to be displayed is
350 days of UV bulb operation and
can be adjusted in 25 day increments.
This should be adjusted with respect to
the bulb’s recommended maintenance
schedule.
Routine Maintenance Reminder.
This feature allows the thermostat to
display the words CALL SERV (Call
for Service) after a set time of system
operation. This is a reminder to
maintain your system at optimum
level of operation. The factory set
interval for CALL SERV to be
displayed is days of system operation.
This should be adjusted with respect to
your HVAC service company’s
recommendation. When enabled the
default is 175 days and can be adjusted
in 25 day increments.
System and
Thermostat Diagnostics.
The display will indicate CHECK
SYSTEM if the room temperature
does not rise within two hours of the