Carrier THERMIDISTAT CONTROL Homeowner's Manual

Now that you own Carrier’s Thermidistat
Control, it’s time to customize your
indoor weather. Carrier’s intelligent, easy-to-use

indoor weather command center combines comput­er-like intelligence with extremely simple operation
in an elegant package. It maximizes the performance
of your Carrier indoor weather system so you can
enjoy custom made indoor weather that fits your
lifestyle. By precisely controlling indoor tempera-

Custom made indoor weather.

Homeowner’s Guide

comfort

THERMIDISTAT™ CONTROL

Now that you own Carrier’s Thermidistat
Control, it’s time to customize your
indoor weather. Carrier’s intelligent, easy-to-use

indoor weather command center combines comput­er-like intelligence with extremely simple operation
in an elegant package. It maximizes the performance
of your Carrier indoor weather system so you can
enjoy custom made indoor weather that fits your
lifestyle. By precisely controlling indoor tempera­tures and humidity levels, our Thermidistat Control
keeps you comfortable while conserving energy. Just
follow the simple instructions outlined in this
manual and let Carrier’s Thermidistat Control deliver
the customized comfort and energy savings that
you deserve.

Custom made indoor weather.

Homeowner’s Guide

comfort

THERMIDISTAT™ CONTROL

Carrier’s Thermidistat Control is
the command center of your indoor
weather s y stem.

By provid in g b o th
temperat ure a nd humidity control, this sim­ple yet powerful de v ice lets you take the
steam out of summer, the static out of wi n­ter and helps eliminate that annoying mois-

Comfort command center.

control

Ca r r ier puts your f a mi l y’s comfort
at your f i nger tips with simple
instr uctions, responsive push but­tons and an easy-to-read back lit
LCD display.

Once set, the
Thermidistat Control rel iabl y monitors
indoor conditions and responsively meets

Making life easier.

features

NOTE: Not all messages displayed in the above illustration will appear at once in any situation. •Available on selected models.

MODE Button selects OFF,HEAT,

COOL, or AUTO operation. EMER­GENCY HEAT (EHEAT) mode is also
included when the Thermidistat
Control is installed with a heat pump.

FAN Button choos-

es ON or AUTO fan
operation.

▲

Room Tempera­ture Display

shows current
room temperature.

▲

▲

SET HUM Button

allows you to
change humidifi­cation set point.

SET TIME Button

allows you to enter
the time of day.

SET HEAT Button

allows you to enter
your desired heat­ing set point.

VACATION Button changes

temperature and humidity set
points to lower levels for opti­mum energy efficiency while
you’re away.

▲

RESET FILTER Function restarts

the timer that determines the next
air filter change or cleaning.
Activated by pressing VACATION
and END buttons simultaneously.

▲

END Button com-

pletes the tempera­ture and humidity
set-up sequence.

▲ ▲

▲

SET COOL Button

allows you to enter
your desired cool­ing set point.

▲

SET DHUM Button

allows you to
change dehumidifi­cation set point.

▲

Up and Down Buttons change

the temperature and humidity set
points. They are also used to
access outdoor temperature and
indoor humidity levels.

▲

*Outdoor

T emperature
Display shows the

outdoor temperature.

▲

*Auxiliary Heat

Indicator is dis-

played when a heat
pump system’s aux­iliary heat is on.

▲

Time of Day
Display exhibits

the time of day.

▲▲

Clean Filter
Indicator lets you

know it is time to
clean or replace your
system’s air filter.

T emperature
Settings Display

shows the temper­ature settings for
current time period.

▲

▲

NP TMstat Homeowner's Guide 8/24/01 11:21 AM Page 2

your desired cool­ing set point.

▲

SET HEAT Button

allows you to enter
your desired heat­ing set point.

▲

SET HUM Button

allows you to
change humidifi­cation set point.

▲

SET TIME Button

allows you to enter
the time of day.

NOTE: Not all messages displayed in the above illustration will appear at once in any situation. •Available on selected models.

VACATION Button changes

temperature and humidity set
points to lower levels for opti­mum energy efficiency while
you’re away.

▲

▲

RESET FILTER Function restarts

the timer that determines the next
air filter change or cleaning.
Activated by pressing VACATION
and END buttons simultaneously.

▲ ▲

END Button com-

pletes the tempera­ture and humidity
set-up sequence.

Up and Down Buttons change

the temperature and humidity set
points. They are also used to
access outdoor temperature and
indoor humidity levels.

Clean Filter

▲▲

Indicator lets you

know it is time to
clean or replace your
system’s air filter.

*Auxiliary Heat

▲

Indicator is dis-

played when a heat
pump system’s aux­iliary heat is on.

Comfort command center.

Carrier’s Thermidistat Control is
the command center of your indoor
weather s y stem.

control

temperat ure a nd humidity control, this sim­ple yet powerful de v ice lets you take the
steam out of summer, the static out of wi n­ter and helps eliminate that annoying mois­ture build-up on your windows when it’s
cold outside. It’s never been quite this easy.

By provid in g both

Making life easier.

Ca r r ier put s your fa mi l y’s comfort
at your f i nger tips with simple
instr uctions, responsive push but­tons and an easy-to-read back lit

features

LCD display.

Thermidistat Control rel iabl y monitors
indoor conditions and responsively meets
your comfort demands for consistent,
ene r gy - efficient i nd o or w e at her .

Once set, the

TABLE OF CONTENTS

SETTING UP THE THERMIDISTA T CONTROL

Setting your indoor temperature set points ...1

Setting the current time ................................2

Setting the mode operation ..........................3

Setting the fan operation ..............................5

Setting the humidification set point ..............6

Setting the dehumidification set point ..........9

Setting the “cool to dehumidify” function ..10

OPERA TING THE THERMIDISTA T CONTROL

Checking current temperature ....................12

Checking the outdoor temperature

and indoor humidity ...............................12

Checking current humidification

and dehumidification set points ..............13

Clean filter feature .....................................14

Vacation feature setup ................................15

Vacation feature operation .........................19

AUTO CHANGEOVER ..................................20

WHAT IF…

The auxiliary heat indicator is displayed ....21

The clean filter indicator is displayed .........21

You have a power outage ...........................22

You have a system error message ...............22

Warranty .......................................................24

Common Terms and Where to Find Them .....25

i

SETTING UP THE THERMIDIST A T CONTROL

Setting your temperature set points

Setting the desired heating set point

1

Press the SET HEAT button.

The word HEAT flashes on the display.

2

Press the UP or DOWN
button until the correct
heating set point is displayed.

3

Press the END button to exit.

Setting the desired cooling set point

1

Press the SET COOL button.

The word COOL flashes on the display.

1

SETTING UP THE THERMIDIST A T CONTROL

2

Press the UP or DOWN
button until the correct

cooling set point is displayed.

3

Press the END button to exit.

NOTE: Your COOL setting must be at least
2° higher than your HEAT setting. Your
Thermidistat Control will automatically
change your previously set temperature to
maintain that 2° difference.

Setting the current time

1

Press the SET TIME button.

The word TIME flashes on the display.

2

Press the UP or DOWN
button until the correct

time is displayed. To quickly advance to

2

SETTING UP THE THERMIDIST A T CONTROL

the proper time, press and hold the UP
or DOWN button. Be sure that AM or
PM is properly selected.

3

When the correct time
appears on the display, press the END
button.

NOTE: If you choose not to press the END
button, the word TIME will stop flashing
after 15 seconds.

NOTE: If you live in a Daylight Savings
Time area, you may advance the time 1
hour in the spring by simultaneously
pressing the SET TIME button and the UP
button. In the fall, you may set the time
back 1 hour by simultaneously pressing the
SET TIME button and the DOWN button.

Setting the mode operation

1

Press the MODE button.

3

SETTING UP THE THERMIDIST A T CONTROL

2

When the MODE button is pressed,

the words

OFF,

HEAT,

COOL,

and AUTO
will rotate on the display.
If you have a heat pump, the display
will show OFF, HEAT, COOL, AUTO,
and EHEAT.

4

SETTING UP THE THERMIDIST A T CONTROL

NOTE: In AUTO mode, your system will
heat OR cool as needed to reach your
temperature settings. AUTO mode may be
disabled.

3

Continue to press the
MODE button until you reach the
desired setting.

Setting the fan operation

1

Press the FAN button to
switch between ON and AUTO fan
settings.

When the ON mode is selected, the
fan runs continuously for improved
air circulation.

5

SETTING UP THE THERMIDIST A T CONTROL

NOTE: If the indoor humidity level is above
the dehumidify setting, the fan will shut off
for 5 minutes after the air conditioner shuts
off. During this period, a triangle next to
the word ON will flash.

When the AUTO mode is selected, the
fan runs only as needed to maintain
your preferred indoor temperature
settings.

Setting the humidification set point

1

Press the SET HUM button
to enter the humidify mode.

The current indoor humidity (large
number) and humidify set point (small
number) are displayed along with the
humidify indicator (hu).

6

SETTING UP THE THERMIDIST A T CONTROL

2

With the humidify indicator

(hu) displayed, press the
UP or DOWN button to adjust the
humidify set point. Humidity levels can
be set from 10% to 45%.

Or, to turn humidification off, press the
MODE button until “OF” appears on the
display. (See suggested settings on page 27.)

3

Press the MODE button to

select between:
a. FAN indicator displayed —

fan and humidifier on every time
humidification is needed.

NOTE: With the FAN indicator displayed,
you will realize maximum humidification,
but the air may feel cold because the heat

7

SETTING UP THE THERMIDIST A T CONTROL

source is not always on. Without the FAN
indicator displayed, you will conserve
water and electricity with adequate
humidification.

b. AUTO indicator displayed —
humidify setting automatically changes
according to outdoor weather. This
reduces the chance of moisture buildup
on windows in colder weather.

NOTE: This feature requires the use of an
outdoor air temperature sensor.

c. AUTO and FAN displayed — com­bines the features of a and b.

d. OF displayed —
humidify function is turned off.

8

SETTING UP THE THERMIDIST A T CONTROL

e. Humidify setting only displayed —
humidify setting does not change
according to outdoor temperature.

4

Press the END button to

exit the humidify mode.

Setting the dehumidification set point

NOTE: This function is for use with
variable-speed equipment only.

1

Press the SET DHUM

button to enter the dehumidify mode.

The current indoor humidity (large number)
and dehumidify set point (small number)
are displayed along with the dehumidify
indicator (dhu).

9

SETTING UP THE THERMIDIST A T CONTROL

2

With the dehumidify

indicator (dhu) displayed,
press the UP or DOWN button to adjust
the dehumidify set point. Dehumidify
levels can be set from 50% to 90%. Or, to
turn dehumidification off, press the MODE
button until “OF” appears on the display.

(See suggested settings on page 26.)

3

Press the END button to exit.

Setting the “cool to dehumidify”
function

This setting allows a standard comfort
system to provide moderate dehumidi­fication by running the air conditioner.
The function can also be used with
variable-speed equipment.

NOTE: While in the “cool to dehumidify”
mode, the indoor air temperature will not
drop more than 3° below the cooling set
point with a dehumidification demand.

10

SETTING UP THE THERMIDIST A T CONTROL

1

Press the SET DHUM
button. “dhu” is displayed.

2

Press the UP or DOWN

button to raise or lower the
dehumidify set point.
Dehumidification can be set from 50%
to 90%.

3

Press the MODE button

until the COOL icon is displayed.

4

Press the END button to exit.

11

OPERA TING THE THERMIDIST A T CONTROL

Checking current temperature

The Thermidistat Control will display
the current temperature.

To view your current

temperature set points,

press the UP or DOWN
button once. The heating and cooling
set points will be displayed.

Checking the outdoor temperature
and indoor humidity

1

Press the UP and DOWN
buttons simultaneously.

2

The outdoor
temperature
will appear on
the display.
T hen, the indoor
humidity will
be displayed.

12

OPERA TING THE THERMIDIST A T CONTROL

NOTE: If 2 dashes (--) appear, your
Thermidistat Control does not include
the outdoor air temperature sensor or the
sensor is not working properly. Check
with your dealer if you are unsure.

Checking current humidification
and dehumidification set points

1

Press the SET HUM button.

The current indoor humidity (large num­ber) is displayed along with the humidify
set point (small number).

2

Press the END button.

13

OPERA TING THE THERMIDIST A T CONTROL

3

Press the SET DHUM button.
The current indoor humidity (large num­ber) is displayed along with the
dehumidify set point (small number).

4

Press the END button.

Clean filter feature

Your Thermidistat Control reminds you
when it’s time to change or clean your filter
by displa ying the CLEAN FILTER indicator.

1 Press the VACATION and

END buttons simultaneously

after you have changed or

cleaned your filter to restart the timer.

14

OPERA TING THE THERMIDIST A T CONTROL

Vacation feature setup

The vacation feature allows a separate
set of temperature and humidity set
points to be stored for vacation and
recalled with a single button press.

The vacation feature is preprogrammed
for you with vacation settings for
temperature and humidity. (Heat 60°,
cool 85°, hu 10%, dhu 75%) If these
are okay, skip ahead to “vacation
feature operation.” If you wish to enter
new settings, continue with this section.

1

Press the VACATION
button to display the vacation
temperature settings.

The OUT indicator is displayed.

15

OPERA TING THE THERMIDIST A T CONTROL

2 To change the cooling set point:

a.) Press the SET COOL

button. COOL will flash on the display.

b.) Press the UP or DOWN
button to adjust the setting.

c.) Press the END button
to end.

3 To change the heating set point:

a.) Press the SET HEAT but­ton. HEAT will flash on the display.

b.) Press the UP or DOWN

button to adjust the setting.

c.) Press the END button

to end.

16

OPERA TING THE THERMIDIST A T CONTROL

4 To change the dehumidification

set point:

a.) Press the SET DHUM
button. The “dhu” indicator will be
displayed.

b.) Press the UP or DOWN

button to adjust the setting.

c.) Press the MODE
button to choose the

dehumidification mode.

c.) Press the END button
to end.

17

OPERA TING THE THERMIDIST A T CONTROL

5 To change the humidification set

point:

a.) Press the SET HUM
button. The “hu” indicator will be
displayed.

b.) Press the UP or DOWN

button to adjust the setting.

c.) Press the MODE
button to turn the

humidification feature off (OF).

c.) Press the END button
to end.

NOTE: In dehumidify, you may enter a set
point, choose “COOL” to dehumidify, or
turn dehumidification off (OF). In humidify,
you may enter a setting or turn
humidification off (OF).

18

OPERA TING THE THERMIDIST A T CONTROL

Vacation feature operation

1

Press the VACATION
button when you are ready to leave.
Be sure you have properly selected the
mode (HEAT, COOL, AUTO).

The OUT indicator is displayed, and
your system will automatically follow
your vacation temperature and
humidity settings.

2

Press the VACATION
button when you return to resume
normal operation.

19

AUTO CHANGEOVER

Your Thermidistat Control provides
complete, automatic control over heating
and cooling with auto changeover. Auto
changeover means your system will
automatically heat or cool as needed to
maintain your temperature set points.

Auto changeover makes life easier
because you no longer have to manually
switch the thermostat between heating
or cooling operation. Just set your heating
and cooling set points and let the
Thermidistat Control do the rest!

NOTE: If Auto Changeover mode is not
necessary in your area of the country, your
installer may disable the AUTO mode.

20

WHAT IF…

AUXILIARY HEAT indicator is
displayed…

The AUXILIARY HEAT indicator appears on
the heat pump version of the Thermidistat
Control only. It is displayed when your
system is operating on auxiliary heat.

NOTE: This indicator does not reflect a prob­lem with your system.

CLEAN FILTER indicator is displayed…

The CLEAN FILTER indicator tells you
when to clean or replace your system’s air
filter. Press the VACATION and END
buttons simultaneously after cleaning or
replacing the filter to turn off the indicator
and restart the timer.

NOTE: This indicator does not reflect a
problem with your system.

21

WHAT IF…

OUT Indicator is displayed…

The OUT indicator reminds you that your
system is in vacation mode. This

function
automatically adjusts the temperature
and humidity settings to levels
appropriate for when you’re away.
Press the VACATION button to resume
normal system operation.

NOTE: This indicator does not reflect a
problem with your system.

EQUIPMENT ON Indicator is displayed…

When the cooling equipment is operating,
the word COOL preceded by a small
triangle is displayed below the cooling set
point. When the heating equipment is
operating, the word HEAT preceded by a
small triangle is displayed below the
heating set point. If the equipment turn on
is being delayed, the triangle and the word
will flash.

NOTE: This indicator does not reflect a
problem with your system.

22

WHAT IF…

You have a power outage…

An internal power source eliminates
the need to re-enter your settings into
the Thermidistat Control after power
outages. The comfort settings you have
entered will be maintained indefinitely.
The clock will run for 8 hours.

You have a system error message…

The display may appear as follows:

--, E3, E4, E5, or E6

-- indicates a problem with the indoor
air temperature sensor

E3 indicates a problem with the
outdoor air temperature sensor

E4, E5, or E6 indicates an internal failure.

23

WARRANTY

This Thermidistat Control includes a
1-year limited warranty. For detailed
warranty information, please refer to
the All Product Limited Warranty Card
included in your information packet.
This Thermidistat Control is also
eligible for manufacturer’s extended
system warranties. Ask your dealer
for details on extended warranties for
longer-term protection.

24

COMMON TERMS AND WHERE TO FIND THEM

Auxiliary Heat ......................Pg. 21

Most heat pump systems require a
supplemental heating source, called
auxiliary heat, to maintain your
comfort when outdoor temperatures
fall significantly. Your Thermidistat
Control lets you know when your home
is being warmed with
supplemental heat.

Clean Filter ..........................Pg. 14

Your system’s air filter will require
regular cleaning to reduce the dirt and
dust in the system and your indoor air.
The CLEAN FILTER indicator lets you
know when it’s time to clean the filter.

25

COMMON TERMS AND WHERE TO FIND THEM

Dehumidification Set Point ....Pg. 9

The amount of moisture to be removed
from your home. You can check your
actual humidity level and your desired
dehumidification set point by pressing
the SET DHUM button.

Suggested settings: 50% – 60%
suggested depending on installation,
area of the country, and your heating &
cooling equipment.

Emergency Heat .....................Pg. 4

This indicates that auxiliary heat is
being used without the heat pump.

End .........................................Pg. 1

The END button returns the
Thermidistat Control to normal
operation.

26

COMMON TERMS AND WHERE TO FIND THEM

Fan .........................................Pg. 5

Your system’s fan can run continuously
or only as called for during heating or
cooling. Continuous operation helps
with air circulation and cleaning.
Automatic operation provides energy
savings. Press the FAN button to make
your choice.

Humidification Set Point ........Pg. 6

The amount of moisture desired in
your home to be supplied by the
humidifier. You can check the actual
humidity level and your desired
humidification set point by pressing
the SET HUM button.

Suggested settings:

27

COMMON TERMS AND WHERE TO FIND THEM

Mode .................................Pgs. 3-5

Mode refers to the type of operation
your system is set up to perform. Mode
settings include: OFF, HEAT, COOL,
and AUTO. Heat pump systems also
include EMERGENCY HEAT (EHEAT).

Outdoor T emper ature ...........Pg. 12

Your Thermidistat Control not only
measures the indoor temperature, but it
may also be equipped to measure and
display the outdoor temperature as
well. Press the UP and DOWN buttons
simultaneously to read the outdoor
temperature display.

28

COMMON TERMS AND WHERE TO FIND THEM

Power Outage ........................Pg. 22

Complete loss of electricity. Your
Thermidistat Control has an internal
power source that allows the clock to
continue to run for 8 hours or more
without electricity. Settings are stored
indefinitely without the aid of batteries.

Reset Filter ..............................Pg. 14

The reset filter function turns off the
CLEAN FILTER indicator and restarts
the timer. Press the VACATION and
END buttons simultaneously after
you’ve cleaned and replaced the sys­tem’s air filter.

29

COMMON TERMS AND WHERE TO FIND THEM

Set T ime .....................................Pg. 2

This function allows you to set the
proper time. Press the SET TIME button
to activate.

Temperature Sensor .............Pg. 12

Temperature sensors measure the cur­rent indoor or outdoor temperatures
which are displayed on the Thermidistat
Control.

Temperature Set Points ...........Pg. 1

These are the desired heating and
cooling set points entered into the
Thermidistat Control. The actual room
temperature will automatically be
displayed, but you can check the
desired temperature for the current
mode by pressing either the UP or
DOWN button.

30

COMMON TERMS AND WHERE TO FIND THEM

Time .......................................Pg. 2

The current time is displayed
continuously on the display.

Up and Down Buttons ...........Pg. 1

These buttons are used to set the clock
and enter temperature and humidity
information.

31