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Operation Guide CT50
To turn your CT50 ON, press the MODE button on the right side. This
cycles the CT50 through HEAT, COOL, AUTO and OFF modes.
top cover
The CT50 programmable communicating
thermostat operates via a high-quality, easy-
Reset
button
HVAC
Wire
to-use touch screen. To program or adjust your
selection
switches
terminals
CT50, simply touch your finger firmly to the
screen. The screen will automatically light up and
Save
Energy
button
you will hear a “beep.” The screen will respond
Mode
button
D
AY
AU
TO
PM
differently to different types of touches, so you
RA
D
IO
Insulation
indicator
F
1
LI
may want to experiment by touching it different
ways, finger, fingernail, etc. Do not use a sharp or
metallic device; it will scratch the screen.
NK
Fan
button
TA
RGET
TE
M
P
COOL
MENU
button
Statement of use: 100% Compatible with all popular
residential HVAC systems; 24VAC single, two stage
conventional heating systems (gas/oil/electric), heat
pumps, single stage or with auxiliary heat (electric
or fossil), zoned forced air and zoned hot water (2
or 3 wire), millivolt systems (with a 18-24 AC or DC
source), one or two stage cooling, and hybrid systems.
1014-011-001
PROG
button
bottom
cover
Touch screen
ENGLISH
MENU Screen
The MENU screen is the gateway to many functions or settings of the
CT50. It is displayed when you press the MENU button. [See page 10 for details]
Set Time
Touch this area to set
the time of day.
Left arrow goes back,
right arrow goes forward.
Chirp set
Touch this to turn the
audible chirp on or off.
Filter Timer set
Touch and hold
5 sec to change.
o
o
Set C - F
FILTER
SWING
DIFF
Touch this
to set temp
display units.
Differential to set
for 2nd Stage start.
Temperature
Swing set
F
Lock Program
Touch for 5 sec
to lock or unlock.
HVAC
SETUP
Set Day
Touch this area to set
the day of the week.
CALIBRATE
Return
to HOME
screen.
Calibration control
Use this to calibrate your
LCD display match to
another thermometer.
HVAC SETUP
Touch this in OFF mode to
configure the unit to work with
your HVAC system.
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PROGRAM Screen
The PROGRAM screen sets the CT50 control for your home
HVAC system. Press PROG for to access it. After that it is displayed when you press the PROG
button. [See page 8 for details]
Return HOME
Set Time Slot
Touch this area to set the
Time Slot you want to program.
When programming is complete
touch this to run your program and
return to the HOME screen.
AM
Set Program Time
MORN
Touch this area to set the
time of day you want each
time period to start.
F
Left arrow goes back,
right arrow goes forward.
[Touch and hold for fast set.]
COPY DAY
Copy
HEAT
Touch this area to copy
current day’s program
to the next day.
PROGRAM
Temp Up / Temp Down
Touch these to raise and
lower each Target Temp.
[Touch and hold for fast set.]
Set Program Day
Touch this area to set the day of the week
you want to program.
MANUAL Screen
The Manual Screen control screen is where you can make
temporary changes to your CT50’s operation. From the Full HOME screen, touch the main
temperature display to use this screen. [See page 13 for details]
Manual Override Indicator
Target
Shows TEMPORARY when
Room
Temperature
Temperature
you have modified the Target Temperature
Temp Up / Temp Down arrows
Touch these to raise and lower
the manual override Target Temp.
TEMPORARY
F
Return HOME
EMER
HOLD
HOLIDAY Touch this to invoke a
single program that repeats day
after day until you turn it off.
HOLIDAY
HEAT
HOLD Touch this area to operate the thermostat as
a manual thermostat. It will keep the temperature
you set until you change it or cancel HOLD.
EMER heat for
HEAT PUMP systems.
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Simple HOME Screen
Make this simple HOME screen the default
for your CT50, switch the mode to OFF and hold the PROG button for 12 seconds. This Simple
HOME screen gives you limited access to the CT50’s features, only the target temp can be changed.
[To return to the regular HOME screen switch the mode to OFF and hold the PROG button for 12
seconds.]
Current Room
Temperature
F
TARGET TEMP
COOL
Thermostat
Target
Mode
Temperature
Initial Settings
Press MENU to access the following commands (from HOME screen).
Set day of the week
Touch the Day of the week area to cycle through the days of the week to select the current day.
Set time of day
Touch the Time of Day arrows to move the time selection forward or backward until
it displays the current time. Touch and hold for faster setting.
Backward Forward
o o
Set F- C display
Touch the F and it will toggle to C.
o
o
Set audible chirp
Touch the musical note icon to select the chirp or no chirp.
Return HOME by touching the home icon.
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Run Program
The CT50 comes pre-programmed with an EPA approved program. This program is recommended by
the EPA for energy efficiency. We strongly recommend that you Auto-Run this program for one week
and see if it works for you. If it does not fit your needs, you can always input a custom program.
To run the EPA program, set the mode switch to HEAT or COOL.
Press the MENU button and use the arrows by the time display to set the time.
Touch the DAY area and advance it to select the present day.
Touch HOME. The unit is now running the program.t
EPA
MORN
6:00am
70oF
DAY
8:00am
62oF
EVEN
6:00pm
NITE
10:00pm
2oF
MORN
DAY
EVEN
NITE
HEAT
COOL
6:00am
8:00am
6:00pm
10:00pm
70o
6
All Days
78oF
85oF
78oF
82oF
All Days
F
TO CHANGE THE PROGRAM:
Make sure the CT50 mode is set to either HEAT or COOL, then press the PROGRAM button. This
puts you at the PROGRAM screen [see page 4]. The programmed start time is displayed in the
upper left. The TIME SLOT icon indicates the active TIME SLOT in the default program [MORN, DAY,
EVEN, NITE]. The programmed Target Temperature is shown on main display.
The HEAT program and the COOL program are separate.
PROGRAM cont.
Select the day you want to program.
The day of the week starts at SU - Sunday and can be advanced to the day you want to program.
Touch the day of the week area to cycle through the days of the week to the desired day.
Select the time slot (period) you want to program (MORN, DAY, EVEN, NITE).
Touch the time slot area to cycle through to the desired period.
Select the desired start time of that time slot.
Touch the time arrows to select the desired period’s starting time. Hold arrow down for fast time
scrolling.
Select the desired target temperature for that time slot.
Touch the +/- arrows to select the desired period’s temperature.
To COPY one day’s programming to the next day, touch COPY DAY once. The information for the
current day will be copied to the next day which will appear on the screen. Holding down COPY for
over 3 seconds will copy to all 7 days.
Touch
to return to the Home screen.
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MENU Screen Functions
Press MENU to bring up MENU screen.
TIME of DAY
Touch the left (backward) or right (forward) arrows next to the time display to set
the current time (1 minute per touch). Touch and hold the arrow for fast time set (15 minute jumps).
DAY of Week Touch DAY area to select present day.
SWING (HVAC cycling rate) This feature allows you to set the desired variance in temperature
between the CT50 setting and the room temperature required before the heating or cooling system
will turn on—from 0.5° to 2.0° F (.25° to 1° C). For example, if SWING is set to 2.0° F and the CT50
is set to 70°F Target Temperature, the heat cycle will start when room temperature drops to 68°F.
Similarly, the cooling system will start when the room temperature increases to 72°F. The HVAC then
runs and will shut off at the Target Temperature.
To set SWING:
Touch SWING.
Touch the left/right arrows to set the SWING from 0.5° to 2.0°F.
The HVAC will run more frequently at .5°F and less at 2°F. Default is 1°F.
Touch
to return to the MENU screen.
Chirp set - Touch this to turn the audible chirp sound on or off.
F
C
o
o
Set - Touch this to change the temperature display scale from F to C .
FILTER - AIR FILTER ALERT - The CT50 can be programmed to remind you when the HVAC
sytem’s air filter needs changing.
Touch FILTER. The display will show the usage to date.
Touch FILTER for over 3 seconds and the display will change to LIMIT.
Touch arrows to set desired usage limit before filter alert comes on home screen.
When this limit is reached, FILTER will be on home screen and the CHECK FILTER indicator lights.
Limit may be set from 0 to 999 days/99 weeks; default is 90 days/12 weeks. Touch to reset.
To reset the usage back to 0, touch usage number; touching it again restores the displayed usage.
Touch
to return to the MENU screen.
LOCK (The CT50 has 2 lock modes)
Touch icon for 5 seconds; the unit will go into the PARTIAL lock mode. The user can temporarily
override the CT50 target with the +/- buttons only. (1 bar)
For FULL lock : Touch the (1 bar) icon again for 5 seconds to go to full lock. No changes can be
made in full lock (2 bars). Once locked, the CT50 will respond just to mode and menu.
To UNLOCK , Press MENU.
Touch and hold icon for 5 seconds for 2 bars (if not there already).
Then touch and hold the icon for another 5 seconds. Each 5 second touch and hold must be separate.
Touch
to return to the Home screen.
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CALIBRATE
Your thermostat was accurately calibrated at the factory to ±1° F of actual ambient
temperature. You do have the option, however, to change the display temperature to match that of a
previous thermostat, or to match another thermostat already in your home. The range of change is
from -6°F to +6°F or -3°C to +3°C.
To change your Thermostat Calibration, touch MENU and then touch CALIBRATE.
Use the + / - to adjust the displayed temperature up or down, as desired.
The DELTA FACTOR that appears on the screen will also automatically increase or decrease
for each 0.5° (F or C) adjustment so you can see your change. The large display will show the
modified temerature reading that will be displayed on the HOME screen and used as the new room
temperature.
Touch
to return to the Home screen.
DIFF (Used for 2 stage normal or heat pump with auxiliary only, not on screen for single stage)
The differential is the number of degrees between the room temperature and the Target Temperature
at which the 2nd stage will be used. Default is 2°F.
Touch MENU and then DIFF. Use the arrows to set the DIFF.
Recommend 2°F for very cold climates and the 4°F for warm climates.
MANUAL Screen Functions
The CT50 has 4 manual override commands. The manual screen is accessed by touching the large
current temperature display in the middle of the HOME screen.
IMPORTANT: The Mode must be in HEAT or COOL to access the manual screen.
TEMPORARY override Touch the + / - arrows to select your desired temporary Target
Temperature. Touch HOME to return to operation. The TEMPORARY icon will display indicating
you have modified the Target Temperature for the current Time Slot only. It goes back to the
program target at the next period. Also, when in TEMPORARY, if the target is set the same as the
programmed target for that period, the word TEMPORARY will go out.
HOLD This will hold the target temperature you set indefinitely, until you turn HOLD off. HOLD will allow
you to operate your thermostat as a manual thermostat. It will keep whatever temperature you set until
you change it or cancel hold. Take care using the HOLD function as the program is now bypassed. To set
a hold target temperature, touch HOLD and use the +/- icons to select your hold temperature. The HOLD
icon will display on the HOME screen indicating you have changed the Target Temperature. The system
will HOLD this temperature until you return to the manual screen and de-select HOLD by touching it. Hold
is also canceled when you set the mode to OFF.
HOLIDAY This is a single program that repeats day after day until you turn it off. It supersedes the
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weekly program. To use it touch HOLIDAY on the temporary screen. The default holiday program is
shown here [Default program: HEAT 70oF all day and 62oF at night. COOL 78oF all day and 82oF
at night.] To modify this program, touch the PROGRAM button and then touch the DAY area until
HOLIDAY appears (after SAT). The default HOLIDAY program is set as 2 time slots; all day (same
target MORN, DAY and EVEN) and a different target for NITE.
EMER (in HEAT PUMP type)
If you set your CT50 for HEAT PUMP with auxiliary heat, EMER function is available on the MANUAL
screen. If you touch EMER, it displays EMER|ON. Your HEAT PUMP is disabled and auxiliary heat
is your sole source of heat. This manual override stays active until you toggle EMER off. Auxiliary
heat is more expensive than the heat pump so use EMER only if the heat pump cannot keep up or is
defective.
Other Functions
Save Energy Button
The “Save Energy” feature on the CT50 provides a simple, easy-to-use way to help you manage your
energy use. SAVE ENERGY automatically adjusts your Target Temperature up in COOL or down in
HEAT by 4oF. To use Save Energy, press the Save Energy button in the upper left corner of the unit.
The screen will now read “Save Energy”. To return to normal operation, press the “Save Energy”
button again. This is useful to save energy if you are gone for a short time.
MODE Button
The mode button sets the CT50 to HEAT, COOL, AUTO, or OFF modes. Press it once to step to the
next mode. If the CT50 is in OFF and you want to return to the mode you were previously in, touch
the OFF indicator on screen.
COOL - This will operate the cooling portion of your HVAC system until it is turned off.
HEAT - This will operate the heating portion of your HVAC system until it is turned off.
AUTO - The CT50 TRUE AUTO mode switches automatically between heat and cool throughout
the year. Unlike other manufacturers, the CT50 TRUE AUTO has no temperature or time limitations
(Patent pending), just program your desired HEAT and COOL temps and select the AUTO mode. The
CT50 will switch from HEAT to COOL as needed.
OFF- This takes your HVAC system “off-line” and it will not control HVAC
functions.
In this mode your house may experience extreme heat or cold.
FAN Button
The fan control is normally in AUTO mode, meaning that the fan operates automatically with the
HVAC system and the thermostat. When the fan button is pressed the fan goes ON; the fan will run
continuously in this manual override until switched back to AUTO by pressing the FAN button again.
[NOTE: Fan ON function is available in the OFF mode to allow simple ventilating.]
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Simple Screen
This display mode limits the amount of information on screen and limits the functions to just the +/- arrows
and the MENU button. To set, with mode in OFF and ...
Hold down the PROGRAM button for 12 seconds to access the limited display screen.
Hold down the PROGRAM button for 12 seconds to leave the limited display screen.
RESET button The RESET button re-boots the CT50 processor. It does not effect the user programs that
have been stored in permanent memory.
Compressor Protection The CT50 has a minimum cycle time of 4 minutes to protect your
compressor in cool and in heat pump (if you have one). The Home screen will show a small clock and A/C
during this time and the compressor will not come on until the 4 minute delay is over.
USNAP
radio
Communicating Thermostat
The CT50 has 2 USNAP radio ports. These allow your thermostat
to communicate with other systems.
Using USNAP Radios The USNAP ports allow you to
connect your CT50 to your home WiFi network. This can give you
access to your home’s HVAC system even when you are away
[with additional web service]. It can also give you access to web
based efficient energy management sites that can help you save
money and protect the environment.You can connect your CT50
to a Home Automation network for HA functionality with remote
access to your HVAC system and home conditions.
USNAP port
To Insert a USNAP radio module:
Power off the CT50. Insert the radio module in either slot on the back of the CT50.
Power up CT50.
To connect to a network follow the instructions
that came with the USNAP module.
Caution
DO NOT INSERT or REMOVE USNAP radio
modules if power is ON. This can damage the
thermostat or radio modules.
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