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System Selector Switch
The System Selector switch on the front of the thermostat
determines the operating mode of the thermostat. You may
select COOL, OFF, HEAT.
NOTE: Anytime you install or remove the thermostat
from the wallplate, slide the System Selector to the
OFF position to prevent the possibility of a rapid sys-
tem On-Off.
Fan Switch
The Fan switch should normally be located in the AUTO
position. The Fan will be turned on along with normal opera-
tion of your system. In a normal gas or oil furnace, the Fan
will be turned on by your furnace after its warm-up delay. For
electric heat, air conditioning, and heat pump operation, the
Fan will turn on with the system.
To run the Fan on continuously, slide the Fan switch to the ON position.
Temporary Manual Override
To temporarily change the current set temperature without affecting your program:
Press and hold for about 1 second to enter
Manual Override mode. When display
or
flashes, you can release the key.
Press again to change to your desired Set
Temperature. Hold the key for 2 seconds to
or
fast-advance the Set Temperature.
Press to return to normal mode, or wait 5
hold
seconds for it to return automatically.
/return
The current program number will flash to
signify the Temporary Override.
At the next program change time, the
Temporary Override is cancelled, and the
next program temperature becomes the
setpoint temperature.
To end the Temporary Manual Override:
Press, then press again. This will return the set temperature to the current
hold
program set temperature.
/return
Permanent Override
To hold your Manual Override for vacation or just an extended period of time:
Press to make the current program tem-
hold
perature the HOLD temperature. HOLD
/return
will be displayed on the LCD, and the
Program number will disappear.
Follow the Temporary Manual Override
instructions above to change the Perma-
nent Manual Override temperature.
You can confirm the held set temperature
hold
by pressing for less than 1 second.
/return
To end the Permanent Manual Override:
Press again. The thermostat will return to the current program, and the HOLD
hold
display will be canceled.
/return
Filter Change Indicator
Your thermostat measures the number of hours your heating and cooling system has been
system
in use. To maximize your system's performance and energy efficiency, change or clean
heat
your filter regularly.
off
cool
filter
fan
auto
Note: Pressing the Filter Key at any time for less than 3 seconds will cause the Filter
on
indicator to appear on the LCD. This is only to confirm key operation, and the timer is
not affected unless the key is held for greater than 3 seconds.
SPAN Setting Mode
Your thermostat is set at the factory to cycle at 0.5˚C (1 F) above and below the set tempera-
ture. (Span = 2) This setting has been designed to provide a comfortable room temperature
under most all conditions. However, if you find your system cycling too fast or too slow, then
the Span can be adjusted to modify the cycle time.
SET TEMP
3
COOL TEMP
SA
The Span settings remain the same for both HEAT and COOL.
PM
The Span can be changed at any time, and is independent of program times or temperatures.
3
When batteries are installed in the thermostat, or the Reset key is pressed, the Span is reset
COOL TEMP
back to setting 2.
Low Battery Warning
Your thermostat has a two-stage low battery warning
system. When the batteries are first detected to be weak,
the first stage low battery warning is indicated by battery
symbol flashing on the LCD display. At your earliest conve-
nience, you need to replace the batteries with 2 new AA
alkaline batteries.
When the batteries become too weak for normal operation,
the thermostat enters the second stage low battery warning
which shuts down the thermostat. In this condition, "BATT"
TH
flashes alone on the display, and the thermostat will turn
your system Off. Your system will remain shut-off until the
PM
batteries are replaced.
HOLD
TEMP
Note: The thermostat will still keep the current time and your programs in memory
until new batteries are installed. After confirming that new batteries have been
inserted, the thermostat will return to normal operation.
When the total system runtime for heat
and cool reaches 400 hours, the Filter
Change Indicator will flash as a reminder
to check your system's filter.
After changing or cleaning the system's
filter, press and hold the Filter Key for 3
seconds. The display will blink, and the
timer will be reset to zero.
Press and hold BOTH for three seconds.
The display will flash, and SPAN will be
displayed on the LCD.
Press to raise the Span to 3. This setting
INCREASES the cycle time by allowing your
system to run LONGER.
Press to lower the Span to 1. This setting
DECREASES the cycle time by causing your
system to run SHORTER.
6
M T W TH F SA SU SET TEMP
AM
PM
FILTER
2
COOL
TEMP
T
PM
3
HEAT
TEMP
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