Digital Thermostat
Owners Manual
Model: PS2110 Series
Your new thermostat will provide years of reliable service
and will create uniform comfort in your home through the
seasons. Thank you for buying the product!
Please read this manual for complete instrucons on
installing and operang your thermostat. If you require
further assistance, please feel free to contact us.
IMPORTANT INFORMATION
1. This thermostat is designed to work on the following
systems:
• Gas – Standing Pilot • Oil – Fired Furnace
• Gas – Electronic Ignion • Single Stage Heat Pumps
– with no auxiliary heat
• Gas – Fired Boilers • Electric Furnace
• Gas – Millivolt Systems • Electric Air Condioning
• Oil – Fired Boilers
This thermostat will NOT control mulstage heat pumps or
110/220V baseboard electric heang systems.
2. Temperature Range
This thermostat can be set between 45°F and 95°F (7°C
and 35°C). However, it will display room temperatures
from 30°F to 99°F (0°C and 37°C). HI will be displayed if
the temperature is higher than 99°F (37°C), and LO will be
displayed if the temperature is lower than 30°F (0°C).
This thermostat will automacally shut down in Heat
mode if the temperature rises above 95°F (35°C), and will
automacally shut down in Cool mode if the temperature
drops below 45°F (7°C).
3. Compressor Protecon
This thermostat provides a 4 minute delay aer shung
o the compressor before it can be restarted. This feature
will prevent damage to your compressor caused by rapid
cycling. It does not prevent a rapid compressor restart due
to short power outages.
4. Baery Warning
Two fresh AA alkaline baeries should provide well over
one year of service. However, when the baeries become
weak the Low Baery Indicator will ash on the display.
When this message occurs, install new alkaline baeries.
You have approximately 1 minute to change the baeries
and keep the thermostat’s sengs. Once the baeries
have become too weak to ensure proper operaon, your
system will be turned o, and the display will be cleared
except for a ashing Low Baery Indicator on the LCD
display.
CAUTION: When only the baery icon ashes on the
display, the thermostat is shut down, and your system
will no longer operate. In this condion, there is no
temperature control.
NOTE: The backlight will not funcon when the thermostat
is in low baery condion.
NOTE: If you plan to be away from the premises over 30
days, we recommend that you replace the old baeries
with new alkaline baeries prior to leaving.
FEATURES
Structure of thermostat and explanaon of the keypads
OPERATION
Start-up
The LCD will show the factory default
display of 70°F (21°C) when baeries
are rst installed. The temperature will
update aer a few seconds.
System Switch
The System switch on the front of the
thermostat determines the operang
mode of the thermostat. You may select
COOL, OFF, or HEAT.
NOTE: Anyme you install or remove the thermostat from
the wallplate, slide the System switch to the OFF posion
to prevent the possibility of a rapid system On – OFF.
Fan Switch
The Fan switch should normally be set in
the AUTO posion. The Fan will turn on
during normal operaon of your system.
In a normal gas or oil furnace, the Fan
will turn aer the furnace warms up. For electric heat, air
condioning, and heat pump operaon, the Fan will turn
on with the system.
To run the Fan connuously, slide the Fan switch to the
ON posion.
Review Current Set Temperature
• Press either the up or down key once to see the Set
Temperature.
The factory default is 68°F (20°C) when started with the
System switch on O or Heat, and 78°F (26°C) when
started with the System switch on Cool.
Seng New Temperature
• Press either up or down once to
display the set temperature.
• Press either up or down again
to change to your desired Set
Temperature. Hold the key down for over 2 seconds to
fast advance the Set Temperature.
The display will return to the normal room temperature
aer the keys have been released for 5 seconds.
Filter Monitor
The thermostat counts the number
of hours your system’s lter has been
in use. To maximize your system’s
performance and energy eciency,
change or clean your lter regularly.
When the total system run me for heat and cool reaches
400 hours, the Filter Change Indicator will ash as a
reminder to check your system’s lter.
Aer changing or cleaning the system lter, press and
release the Filter Buon. The usage hours will display on
the screen. Reset the display by pressing and holding the
Filter Buon again unl the hours displayed are zero (0).
Note: Pressing the Filter key at any me for less than 3
seconds will cause the Filter Change Indicator to appear
on the LCD. This is only to conrm key operaon. The
counter is not aected unless the key is held for 3 seconds
or longer.
DIFF Seng
Your thermostat is set at the factory to cycle at 2°F (1°C)
above and below the set temperature (DIFF = 2). This
seng has been designed to provide a comfortable room
temperature under most condions. However, if you nd
your system cycling too fast or too slow, then the DIFF can
be adjusted to modify the cycle me.
• Press and hold BOTH up and down keys for three
seconds. DIFF will be displayed on the LCD.
• Press up to raise the DIFF to 3. This seng
INCREASES the me between cycles by
allowing your system to run LONGER.
• Press down to lower the DIFF to 1. This
seng DECREASES the me between cycles
by causing your system to run SHORTER.
The DIFF sengs remain the same for both HEAT and
COOL, and can be changed in any System Switch posion.
When baeries are installed in the thermostat, the DIFF is
reset back to seng 2.
Backlighng
Your thermostat has an electroluminescent lamp that
backlights the display for easy viewing in the dark. When
any key is pressed, the display is illuminated.
The display will remain illuminated for 7 seconds aer the
last key is pressed. This allows the light to stay on if you
need to operate several keys.
Note: If the thermostat is in the Low Baery warning
condion, the backlight will not operate. Replace with 2
new AA alkaline baeries to restore the backlight funcon.
Low Baery Warning
Your thermostat has a two-stage low
baery warning system. When the
baeries are rst detected to be weak,
the rst stage low baery warning is
indicated by a baery symbol ashing
on the LCD display. Replace the baeries with 2 new
AA alkaline baeries. When the baeries become too
weak for normal operaon, the thermostat enters the
second stage low baery warning which shuts down the
thermostat. In this condion, the baery symbol ashes
alone on the display and the thermostat will turn your
system o. Your system will remain o unl the baeries
are replaced.
Note: The thermostat will sll keep the current set
temperature and lter run me in memory unl new
baeries are installed. Aer conrming that new baeries
have been inserted, the thermostat will return to normal
operaon.
Error Mode
If the thermostat is unable to control
your system due to an unexpected
baery problem, the thermostat will
enter Error Mode. In this condion, the
thermostat ashes E1 or E2 on the LCD
display, and shuts o your system.
To correct this problem, replace the
baeries with 2 new AA alkaline
baeries, even if you have recently
replaced them. Next, remove the baery, hold any key,
then replace the baery again. You will need to reprogram
your thermostat and conrm normal operaon. If Error
Mode returns, please call us for further informaon.
LCD Display Informaon LCD Display Informaon
E1 Sensor Error E2 System Switch Error
Auto Cut O
Your thermostat will automacally shut down in Heat
mode if the room temperature rises above 95°F (35°C).
It will shut down in cool mode if the room temperature
drops below 45°F (7°C).
Note that if your system has malfunconed and no longer
responds to thermostat controls, the Auto Cut-O will have
no eect.
Mechanical Heat Backup
This thermostat includes a bimetal switch that will
automacally turn on the Heat when the temperature
reaches about 41°F (5°C). WARNING: This switch only
acvates the heang terminal (W). The system itself must
be capable of automacally turning the fan on. Without
normal fan operaon, severe damage to the heang
system could result.
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