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2) Select FA or SL (Fast or Slow) Heating Cycle Rate - The
FA setting is frequently used for gas, oil or electric heat. The
SL setting produces a longer heating cycle which is nor-
mally for hot water or steam (hydronic) systems. Both
settings produce very accurate temperature control and
can be set to your personal preference. FA cycles the
system just under 1°F and the SL setting cycles at approxi-
mately 1.5°F.
3) Select Display Backlight (d-L OFF or ON) - The display
backlight improves display contrast in low lighting condi-
tions. Selecting backlight ON will keep the light on for a
short period of time after any key is pressed. Selecting OFF
will keep the light off.
4) Select filter replacement run time - The thermostat will
display "FILTER" after the selected time of operation. This
is a reminder to change or clean your air filter. This time
can be set from 0 to 1950 hours in 50 hour increments.
A selection of 000 will cancel this feature. When
"FILTER" is displayed, you can clear it by pressing
and at the same time. This resets the timer and starts
counting the hours until the next filter change.
5) Select Compressor Lockout (LOC OFF or ON) - Select-
ing LOC ON will cause the thermostat to wait 5 minutes
before turning on the compressor if the heating and cooling
system loses power. It will also wait 5 minutes minimum
between cooling cycles. This is intended to help protect the
compressor from short cycling. Some newer compressors
already have a time delay built in and do not require this
feature. Your compressor manufacturer can tell you if the
feature is already present in their system. When the
compressor time delay occurs it will flash the (snowflake
icon) for about five minutes then turn on the compressor.
6) Select Temperature Display Adjustment (4 LO to 4 HI) -
Allows you to adjust the room temperature display 4° higher
or lower. Your thermostat was accurately calibrated at the
factory but you have the option to change the display
temperature to match your previous thermostat.
7) Select Temperature DIsplay (°F or °C) - Changes the
display readout to Celsius or Fahrenheit as required.
OPERATING FEATURES
Now that you are familiar with the thermostat buttons and
display, read the following information to learn about the many
features of the thermostat.
• SIMULTANEOUS HEATING/COOLING SETPOINT
STORAGE — You can enter both your heating and cooling
set points at the same time. There is no need to change the
thermostat at the beginning of each season.
• CONFIGURATION MENU — Allows you to customize
certain thermostat options.
SETTING THE THERMOSTAT
This thermostat is very easy to operate. Set the SYSTEM switch
to either HEAT or COOL then press
or until the
temperature you want to maintain is shown on the right side of
the display. If you want to turn the system off, just move the
SYSTEM switch to OFF.
The FAN switch controls the fan operation. When the FAN
switch is set to AUTO, the fan will cycle with the furnace or air
conditioner. When the FAN switch is set to ON, the fan will run
continuously, regardless of SYSTEM switch position.
TROUBLESHOOTING
No Heating
With the SYSTEM switch set to HEAT, when the setpoint
temperature is raised or lowered past the room temperature,
the thermostat will make a soft click sound. Usually, the sound
indicates the thermostat is operating correctly. If the system
does not come on, check the system or contact your heating/
cooling service person. If the thermostat does not click try the
Reset Operation listed below.
No Cooling
Same procedure as heating except set SYSTEM switch to
COOL. There can be up to a 5 minute compressor lock-out time
delay before the thermostat clicks in COOL.
Blank Display
A blank digital display usually indicates the thermostat has
received a voltage spike, static discharge or requires new
batteries. If the display remains blank after replacing the
batteries, see Reset Operation below.
Reset Operation
If a voltage spike or static discharge blanks out the display or
causes erratic thermostat operation you can reset the thermo-
stat by pressing
, and move the SYSTEM switch from
OFF to HEAT at the same time. This also resets the factory
defaults to the configuration menu. If the thermostat has
power, has been reset and still does not function correctly
contact your heating/cooling service person or place of pur-
chase.
The Emerson logo is a
trademark and a service mark
of Emerson Electric Co.