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FAQs
FAQs 1F97-391
5. My furnace (air condition-
ing) cycles too fast (slow). Is
there an adjustment?
6. Why does the blower fan
keep running after the system
has shut off?
The
1F97-3911F97-391
1F97-3911F97-391
1F97-391 has a feature called Adjustable Heating and Cooling Cycle times (also
called Anticipation) that allows you to increase or decrease the cycle times in heating and
cooling. This is useful if you think your cycle times are too long or too short. The higher
the number you select, the longer the cycle. The lower the number you select, the shorter
the cycle. The
1F97-3911F97-391
1F97-3911F97-391
1F97-391 is adjusted in the configuration menu (see your installation
instructions). The range of adjustment for HEATING is from 2 to 40. The factory Preset is
5. The range of adjustment for COOLING is from 9 to 40. The factory Preset is 12. The
cooling will not go below 9 because compressors require a longer cycle. See page 20.
Normally the blower will turn off within a few minutes after the call for heat or cool. The
blower running after the system shuts off may indicate (1) the thermostat is set to
FF
FF
F
ANAN
ANAN
AN
ONON
ONON
ON, (2) the fan has been programmed to run at that time period or (3) something has
damaged the thermostat or equipment. If the thermostat display indicates
FF
FF
F
AN ONAN ON
AN ONAN ON
AN ON, press
the fan button once to set it to
FF
FF
F
AN AN
AN AN
AN
AA
AA
A
UTUT
UTUT
UT
OO
OO
O, meaning the fan will cycle only with the
equipment. If the display indicates
PRPR
PRPR
PR
G FG F
G FG F
G F
ANAN
ANAN
AN (Program Fan), sometime during program-
ming, the
FF
FF
F
ANAN
ANAN
AN button was pushed. To remove
PRPR
PRPR
PR
G FG F
G FG F
G F
ANAN
ANAN
AN (Program Fan), check all of the
programmed times and temperatures. When you encounter
PRPR
PRPR
PR
G FG F
G FG F
G F
ANAN
ANAN
AN, press the
FF
FF
F
ANAN
ANAN
AN
button to remove it from that time period in the program. As a final test, set the thermostat
to
OFFOFF
OFFOFF
OFF. Verify that
FF
FF
F
AN ONAN ON
AN ONAN ON
AN ON or
FF
FF
F
AN AN
AN AN
AN
AA
AA
A
UTUT
UTUT
UT
OO
OO
O is not displayed. If the fan continues to run,
you may want to contact your heating and cooling service person for assistance.