Radio Thermostat CT80 User manual

PG 1
Install Guide CT80
• The thermostat is a precise instrument, handle with care.
• Turn off electricity to the HVAC system before installing
or servicing thermostat or any part of the system.
• Do not turn electricity back on until work is completed.
• Do not short (jumper) across electric terminals at the
control on the furnace or air conditioner to test the
system. This may damage the thermostat.
• All wiring must conform to local codes and ordinances.
• This thermostat is designed for use with 24VAC and
millivolt systems (with a separate 24VAC power adapter).
• The thermostat relay load should be limited to 1.0 amp;
higher amperage may cause damage to the thermostat.
To avoid electrical shock and to prevent damage to the
furnace, air conditioner, and thermostat, disconnect the
power supply before beginning work. This can be done at
the circuit breaker, or at the HVAC system.
Caution
ENGLISH
Caution
Save
Energy
button
Power Grid
status
indicator
top cover
Touch screen
Wire
terminals
RC-RH�
Connect Switch
Increase
temp
button
Home
button
Mode
button
Lower
temp
MENU
button
Reset
button
bottom
cover
statu
HVAC
Filter
s
status
FAN
HEAT
CHECK
FILTER
SAVE
ENERGY
COOL
pn812-003-002 b2
button

PG 2
PG 2
You will need a small Phillips screwdriver and a drill with 3/16-in. (4.8mm) bit for wall mounts.
Replacement installations - mount the CT80 in place of the thermostat. You must have a “C” wire or
other 24VAC power available at the CT80 location. A new location will require moving your wiring.
New installations and for relocating the CT80 - follow the guidelines listed below:
• Locate the thermostat on an inside wall, about 5 ft. (1.5m) above the oor, and in a room that
is used often.
• Do not install it where there are unusual heating conditions, such as: in direct sunlight; near
a lamp, radio, television, radiator register, replace; near hot water pipes in a wall; or near a
stove on the other side of a wall.
• Do not locate in unusual cooling conditions, such as: on a wall
separating an unheated room; or in a draft from a stairwell, door,
or window.
• Do not locate in a damp area. This can lead to corrosion that will
shorten thermostat life.
• Do not locate where air circulation is poor, such as: in a corner, an
alcove; behind an open door.
• Do not install the CT80 until all construction and painting has
been completed.
• This thermostat does not require leveling.
TOOLS
LOCATION
Good
5ft.
(1.5m)

PG 2
PG 2
PG 3
Switch OFF electricity to the furnace and air conditioner; then follow these steps.
• Remove cover from old thermostat. Most are snap-on types and simply pull off. Some have locking
screws on the side or front. These must be loosened. DO NOT remove wires. Note the letters
printed near the terminals. Attach labels (enclosed) to each wire for identication.
Read instructions carefully before removing any wiring from
existing thermostat. Wires must be labeled before they are
removed. THERE IS NO STANDARD COLOR CODE. When remov-
ing wires from their terminals, ignore the color of the wires and
LABEL THEM by the terminal where they were screwed.
• Label the wires one at a time. You must label all the wires
before you proceed. With all wires labeled, remove them from
the old unit.
• Make sure the wires do not fall back inside the wall. You can
wind them around a pencil to keep them from falling.
• Loosen all screws on the old thermostat and remove it from the
wall.
C
G
W
REMOVE OLD UNIT
Caution

PG 4
PG 4
What wires do you have?
Make sure your wires are labeled. This may require you to nd the ‘other end’ connection for each
wire on your heating or air conditioning equipment and read the label there. Refer to the Wire
Reference page at end of install section for better understanding of
wire labels from different HVAC system makers.
IMPORTANT: The CT80 requires constant 24VAC power from the
HVAC system’s “C wire”. If you do not have a C wire you can run a new
wire from the HVAC or use a standard 24VAC 100mA or greater wall
transformer.
IMPORTANT: If you have both RH and RC wires you need to move
the RC/RH switch to the UP position which separates these terminals.
Prepare Wires
Please follow these guidelines for safe and secure wire connections:
• You will need at least 2.6” of wire for each of your connections to the CT80.
• If you do not have enough wire, splice additional wire to allow enough slack.
• Terminals accept wires from 16-22awg.
• Fan out wires below the hole as shown.
• Remove insulation 1/8” from the tip of each wire.
Wire Terminals
G
CYR
W
2.6"

PG 4
PG 4
PG 5
Find the step-by-step diagram for your system • Select the reference page with your
wiring diagram and set-up
information below.
• The C-wire is required to operate
your CT80. If you do not have a
C wire you will need to provide an
alternate source of 24VAC power to
the unit.
• If your combination of wires is
shown here, you can use the wiring
table at the end of the install section
to determine your connections, or
contact customer support for help.
• When handling, take care not to
damage the labels for each wire.
G
W Y
RH RC G
6 Wire
Heat/Cool
From
HVAC
RC
CYRH
W
W Y R G
5 Wire
Heat/Cool
From
HVAC
G
C
YR
W
W R G
4 Wire
Heat
From
HVAC
CRG
W
From
HVAC
C
W
W R
R
3 Wire
Heat
WIRES
WIRES
WIRES
WIRES
G
R
Wn Yn R G
Multi-stage Cool
From
HVAC
Y
n
C
W n
B or O AUXn YnRG
Multi-stage
Heat Pump
w/
Multi-stage
Multi-stage Heat
Aux Heat
From
HVAC
R
CO
or
AUXn
B
G
Yn
G
B or O Y R G
w/o Aux Heat
From
HVAC
R
CO
or
Y
B
WIRES
WIRES
WIRES
Go To page 14
Go To page
14
Go To page 15
Go To page
15
Go To page 16
Go To page
16
G o To page
17
Heat Pump

PG 6
PG 6
• “Fan out” wires as illustrated with CT80 below the wall
opening. As in the example: fan out the wires so that the
C wire is above the C terminal, the W above the W. This
allows the CT80 to t snug to the wall.
Caution
Do not allow wires to touch each other or parts on thermostat.
• Wires will position behind the CT80 and up over the
terminal area.
• Do not bunch wires behind the CT80. Feed any slack
back into the wall opening.
Connect Your Wires
• Connect labeled wires only to a terminal with the same
letter label.
• Insert the wire in the terminal well and tighten the screw securely.
NOTE: If you wish you can mount the CT80 to the wall rst, and then connect the wires.
• The CT80 can be externally powered with a power source rated for 24V, AC or DC, at 300ma or
greater. If used, connect to the C and RH terminals (no polarity).
C
G
YRH
W
C
G
YRH
W
C
G
YRH
W
C
G
YRH
W
C
G
YRH
W
C
G
YRH
W
YG
C
W
from HEAT/COOL system
R

PG 6
PG 6
PG 7
Mount the CT80 to Wall
1. Hold the CT80 against the wall, with the wires coming over the
top; above terminal block. The CT80 will cover the hole in the wall.
2. Position CT80 for best appearance.
3. Attach the CT80 to the wall with the screws provided.
4. If you are mounting the CT80 to sheet rock or if you are using the
old mounting holes, use the plastic anchors provided.
5. Mark rst and drill a 3/16-in.(4.8mm) hole for the insert at each
screw location, then mount the unit.
C
G
YRH
W
C
G
YRH
W
C
G
YRH
W
C
G
YRH
W
C
G
YRH
W
C
G
YRH
W
Wall
Wires
Wall
anchor
CT80
Screw to wall
Place wires like this
inside wire groove
from
HEAT/COOL
system
CW
Y
RH
G

PG 8
PG 8
Turn ON Power With all the wires connected (including the C wire), it is time
to turn the AC power back on. Do this at the breaker you used to switch it off. The CT80 will power-up
in the control OFF mode. Your CT80 is not congured to operate your HVAC system yet. You must
now use the menu driven HVAC SET-UP function.
HVAC setup
IMPORTANT: Make sure the CT80 is powered up and is in the OFF mode before set-up. (To turn
your thermostat off, press the Mode button in the middle of the control bar to the right of the display and
touch OFF). Heat and Cool systems must be congured separately (except with Heat Pumps).
The CT80 uses an easy to use interview to determine the proper setup for your HVAC system.
You must know what type of HVAC system you have before answering the interview questions.
If you are not sure, go to the HVAC unit and determine the make and model then get a manual
for the system.
If you are experienced with HVAC systems, you can use the FASTSET single page setup to set
all functions on one screen.
Interview setup - You will need to be able to answer these questions -
“Do you want to congure HEAT or COOL? (Touch one)
Do you have a NORMAL heating system or a HEAT PUMP system?

PG 8
PG 8
PG 9
Is your heat GAS/OIL or ELECTRIC?
Is your system multi-stage? No 2 Stages 3 Stages
Thank you, your thermostat is congured to control your HEATing.
Congure COOL?
How many stages of A/C do you have? 1 stage 2 stage
Thank you, your thermostat is congured to control your COOLing.”
If you have a HEAT PUMP system you will be asked these questions -
“Is your heat pump multi-stage? 1 stage 2 stage
Do you have auxiliary heat? YES or NO
(if yes) What kind of aux heat do you have? ELEC or GAS/OIL
How many stages of aux heat do you have? 1 stage 2 stage 3stage
(Maximum of 5 stages total pump and aux)
Thank you, your thermostat is congured to control your heating and cooling.”
When you have completed set-up completing interview go to pg 11
and test your installation.
FASTSET for NORMAL systems (not a heat pump):
1. Press the purple MENU button on the control bar and then touch
HVAC SET-UP.
2. Touch to highlight HEAT in the upper left corner of the display.
3. Touch to highlight NORMAL.
12:30pm WED7 7.
HEAT PUMP
HEAT
or COOL
NORMAL
AUXILIARY
ELECT or GAS-OILAUX
BACK<INTERVIEW>>
HVAC SET-UP
STAGES
[1]
[NONE]
FAN CONTROL TSTAT

PG 10
PG 10
4. Select the appropriate number of stages for your heating system (from 1 to 3) by touching the
number of STAGES (in brackets) to highlight, and using the +/- buttons to increase or decrease.
5. Touch the appropriate FAN CONTROL setting.
Select HVAC if your heating system controls the fan (appropriate for most gas, oil, propane and
similar furnaces).
Select TSTAT if you want the thermostat to control the fan (for most electric heating systems).
6. Go on to congure COOL or press HOME to return to the Home screen.
FASTSET for NORMAL A/C cooling systems:
1. Press MENU and then touch HVAC SET-UP.
2. Touch and highlight COOL in the upper left corner of the display.
3. Select the number of stages of compression for your cooling system (1 or 2) by touching the
number of STAGES and using +/- buttons to increase or decrease.
4. Touch to select the appropriate FAN CONTROL setting HVAC or TSTAT.
NOTE: Most cooling systems require that the thermostat TSTAT control the fan.
5. Press HOME to return to the Home screen.
SET-UP for HEAT PUMP systems:
1. Press MENU and then touch HVAC SET-UP.
2. Touch HEAT in the upper left corner of the display.
3. Touch HEAT PUMP.
4. Select the number of stages of compression for your heat pump system (1 or 2) by touching the
number of STAGES, and using the +/- buttons to increase or decrease (same for HEAT and COOL).
NOTE: Most heat pump systems have one stage of compression.

PG 10
PG 10
PG 11
5. If you have AUXILIARY heat, touch the number of stages (default is [NONE] ) use the +/-
buttons to select 1-3 stages. (NOTE: The CT80 controls a maximum of 5 stages total between
pump and AUX.)
6. (If you have AUX) Select the type of auxiliary heat that you have - Electric or Gas-Oil.
NOTE: Most heat pump systems have electric heat strips for auxiliary heat.
7. Fan Control is set by the CT80 (tstat) for heat pumps.
8. Press HOME button to return to the Home
screen.
NOTE: For heat pump system your cooling is
already congured since the heat pump unit
provides both heating and cooling.
Check HVAC system
Test Installation
Follow these procedures to verify you have
correctly installed the CT80.
TO CHECK FAN (If you connected the G wire):
Touch the fan icon and turn the fan ON.
Verify that air is blowing from the system.
Press the fan icon again and return to AUTO.
FAN
HEAT
CHECK
FILTER
SAVE
ENERGY
COOL
Powe r
St at us
$.05/kWh
EAT
12:30pm
WED
TARGET
77
o
TEMP
HU MI D
23
%
FA
N
o
F
H
Te mperature
+ / - Buttons
Mode
control
Fan
control

PG 12
PG 12
Test Installation cont.
To check HEAT mode:
1. Press the mode control and select HEAT.
2. Press the +button to raise the target temp to 90oF. Allow the system 2 minutes to respond.
3. Verify that heat is blowing from the system.
4. Return mode control to OFF (leave OFF for 4 minutes before checking COOL).
To check COOL mode (do not operate AC if outside temp is below 65oF):
1. Press the mode control and select COOL.
2. Press the blue -button to lower the cool target temperature to 50oF.
Allow the system 5 minutes to respond.
3. Verify that cool air is blowing from the system.
4. Return mode to OFF
Congratulations, you have successfully installed your unit. Please proceed to the
OPERATING Guide to initialize the CT80.
IMPORTANT: After you have labeled and connected your wires, and followed the correct HVAC set-up,
if these check procedures do n ot operate your system more info is available on our website at www.radiothermostat.com
or 877-602-5028. eatures

PG 12
PG 12
PG 13
STATEMENT OF USE - This thermostat can be used with all 24VAC and millivolt (24VAC external
power) heating and cooling systems. It cannot be used with line voltage systems. This thermostat is
digital and your desired heat or cool temperatures can easily be set on the large touch screen with the
+/- buttons. A minimum 4 minute off time protects heating and cooling compressors from damage.
This thermostat uses a new technique called sequential staging for more comfort with faster reaction
to requested temperature changes.
24VAC is Required -
This thermostat can run on the HVAC system’s 24VAC common “C” wire or an external adapter 12V
to 24V AC or DC connected to the C and RH (no polarity). The 24VAC “C” wire is the other side of the
24VAC heating transformer and can be found where the other thermostat wires connect at the wall or
at the furnace. Do not use the common or ground side of the line voltage.

PG 14
PG 14
Step-by-step wiring diagrams
WIRES
3 Wire Heat GAS MILLIVOLT or 24VAC system
STEP 1 - Connect the R (or RH) wire to the RH terminal.
This connects the heat power.
STEP 2 - Connect the W wire to the W terminal.
This connects the heat.
STEP 3 - Connect the C wire to the C terminal.
Your heater is now connected to the CT80.
Please Go To Page 6
WIRES
4 Wire Heat
STEP 1 - Connect the R (or RH) wire to the RH terminal. This connects the heat power.
STEP 2 - Connect the W wire to the W terminal.
This connects the heat.
STEP 3 - Connect the G wire to the G terminal on the
thermostat. This connects the fan.
STEP 4 - Connect the C wire to the C terminal.
Your system is now connected to the CT80.
Please Go To Page 6
RC and RH
connected
RC and RH
connected
POWER
HVAC SYSTEM
THERMOSTAT TERMINALS
W
R
C
C H B O W
W2 W3
Y
Y2 RH RC
G A
DH EX
HVAC SYSTEM
POWER
W
R G
C
THERMOSTAT TERMINALS
C H B O W
W2 W3
Y
Y2 RH RC
G A
DH EX

PG 14
PG 14
PG 15
W Y R G
WIRES
5 Wire Heat/Cool
STEP 1 - Connect the W wire to the W terminal.
This connects the heat.
STEP 2 - Connect the Y wire to the Y terminal.
This connects the cooling compressor.
STEP 3 - Connect the R (or RH) wire to the RH terminal. This connects the power.
STEP 4 - Connect the G wire to the G terminal on the thermostat. This connects the fan.
STEP 5 - Connect the C wire to the C terminal.
Your HVAC system is now connected to the CT80.
Please Go To Page 6
W Y RH RC G
WIRES
6 Wire HEAT/Cool
STEP 1 - Connect the W wire to the W terminal. This connects the heat.
STEP 2 - Connect the Y wire to the Y terminal. This connects to the cooling compressor.
STEP 3 - Disconnect the RC and RC terminals by placing the RC-RH switch in the UP position.
STEP 4 - Connect the RH wire to the RH and the RC
wire to the RC terminals. This connects power.
STEP 5 - Connect the G wire to the G terminal. This
connects the fan.
STEP 6 - Connect the C wire to the C terminal.
Your HVAC system is now connected to the CT80.
Please Go To Page 6
RC and RH
connected
HVAC SYSTEM
POWER
W Y
R G
C
THERMOSTAT TERMINALS
C H B O W
W2 W3
Y
Y2 RH RC
G A
DH EX
HVAC SYSTEM
POWER
W Y
RHG
C
RC
RC and RH
disconnected
THERMOSTAT TERMINALS
C H B O W W2 W3 Y Y2 RH RC G A DH EX

PG 16
PG 16
W
n
Y
n
R
G
Multi-stage Heat and Multi-stage Cool
The CT80 can handle up to 3 stages of HEAT and 2 stages of COOL.
STEP 1 - Connect the W, W2 and W3 wires to the W terminals. This
connects the stages of HEAT.
STEP 2 - Connect the Y and Y2 wires to the Y terminals.
This connects the stages of COOL.
STEP 3 - STEP 5 - Connect the R (or RH) wire to the RH
terminal. This connects the power.
STEP 4 - Connect the G wire to the G terminal. This connects the fan.
STEP 5 - Connect the C wire to the C terminal.
Your HVAC system is now connected to the CT80.
Please Go To Page 6
Heat Pump (heat/cool) without Auxiliary Heat
STEP 1 - Connect O wire to the O terminal or B wire to the B. This connects the change-over valve.
If you have both O and B - connect only the O wire to the O terminal and DO NOT connect B to B
terminal (see wire reference under Trane for B wire terminal).
STEP 2 - Connect the Y wire(s) to the Y terminal(s).
This connects the compressor (stages).
STEP 3 - Connect the R (or RH) wire to RH.
This connects the power.
STEP 4 - Connect the G wire to the G. This connects the fan.
STEP 5 - Connect the C wire to the C terminal.
Your HVAC system is now connected to the CT80.
Please Go To Page 6
RC and RH
connected
RC and RH
connected
HVAC SYSTEM
POWER
W
Y Y2GR
C
W3W2
THERMOSTAT TERMINALS
C H B O W W2 W3 Y Y2 RH RC G A DH EX
HVAC SYSTEM
POWER
BO
Y Y 2 GR
C
or
or
THERMOSTAT TERMINALS
C H B O W
W2 W3
Y
Y2 RH RC
G A
DH EX

PG 16
PG 16
PG 17
Oor B AUX
n
Y
n
R G Multi-stage Heat Pump with Multi-stage Aux Heat
The CT80 can handle up to 2 stages of Pump compression and 3 stages of AUX heat.
STEP 1 - Connect O wire to the O terminal or B wire to the B terminal. This connects the change-over valve.
If you have both O and B - connect only the O wire to the O terminal and DO NOT connect B to B terminal
(see wire reference under Trane for B wire terminal).
STEP 2 - Connect the AUX 1, AUX 2, AUX 3 to the W, W2 and W3
respectively. This connects the auxiliary heat.
STEP 3 - Connect the Y and Y2 wires to the Y terminals. This
connects the compressor.
STEP 4 - Connect the R (or RH) wire to RH terminal.
This connects the power.
STEP 5 - Connect the G wire to G terminal.
This connects the fan.
STEP 6 - Connect the C wire to the C terminal.
Your HVAC system is now connected to the CT80.
Please Go To Page 6
Accessory Wiring -
3 Wire Zoned Hot Water Heat -
For 3 wire solenoid or motor valves connect the wires shown to
the correct terminals on the CT80. If you have different letters
than shown, go to page 20.
RC and RH
connected
HVAC SYSTEM
POWER
B
GRY Y2
C O
or
or
AUX1 AUX2 AUX3
THERMOSTAT TERMINALS
C H B O W W2 W3 Y Y2 RH RC G A DH EX
SOLENOID VALVE
W
ARH
CT80
M
O
T
O
R VALVE
W
RH A
CT80
F
O
R 3WIRE Z
O
NED
HOT WATER
W
R
A
W
R
A

PG 18
PG 18
Humidier -
To use the CT80 internal humidistat to control an external
humidier unit, connect it as shown. Connect the H
terminal to the control leg of the humidier relay. This
allows H to turn the humidier ON and Off.
DeHumidier -
To use the CT80 internal humidistat to control an external
dehumidier unit, connect it as shown. Connect the DH
terminal to the control leg of the dehumidier relay. This
allows DH to turn the dehumidier ON and OFF.
Fresh Air -
The Fresh Air feature uses the EX relay to control a bafe
on a fresh external air source. Connect the 24VAC bafe
to C and EX terminals.
H or DH
To HUMIDIFIER
or
DEHUMIDIFIER
RELAY
RH
FOR EXTERNAL HUMIDIFIER
or DEHUMIDIFIER USING
HVAC SYSTEM's 24VAC
H or DH
R
C
CT80
FURNACE
POWER
24VAC
H or DH
To HUMIDIFIER
or
DEHUMIDIFIER
RELAY
RH
USING 24VAC ADAPTER
H or DH
R
C
CT80
FURNACE
POWER
AC
ADPT
FOR EXTERNAL HUMIDIFIER
or DEHUMIDIFIER USING
BAFFLE
RH
FOR FRESH AIR BAFFLE
EX
R
C
CT80
FURNACE
POWER

PG 18
PG 18
PG 19
Wire Reference Table
Possible Wires What They Control
R or V or VR RH and RC Single power for HEAT and COOL
RH or 4 RH Power for HEAT (RH not connected to RC with switch in UP position)
RC RC Power for COOL (RH not connected to RC with switch in UP position)
W W Heat control - Normal 1st stage heat or heat pump aux 1st stage
W2 W2 Normal 2nd stage heat or heat pump aux 2nd stage
W3 W3 Normal 3rd stage heat or heat pump aux 3rd stage
Y Y COOL control or 1st stage compression for heat pump
Y2 Y2 2nd stage COOL control or 2nd stage compression for a heat pump
G or F G FAN control
C or X C 24VAC power (to power thermostat)
NOTE: TRANE, AMERICAN STANDARD and YORK often use the letter B for C
H H External Humidier
DH DH External De-Humidier
EX EX external fresh air bafe
B B Heat pump changeover (cool to heat, powered in heat)
O O Heat pump changeover (heat to cool, powered in cool)
B and O IMPORTANT: If you have a heat pump with both B and O wires (Trane pump
products) DO NOT CONNECT B to B terminal, connect B to C terminal.
Other Trane products use B letter for C wire.
E n/a Emergency heat (do not connect, tape off)
L n/a System monitor (do not connect, tape off)
T n/a Outdoor sensor (do not connect, tape off)

PG 20PG 20
Wire Ref Cont.
Lennox Heat Pump
V or VR or R RH Power for HEAT
M or Y Y COOL control
Y or W or W2 W2 2nd stage HEAT
F or G G Fan control
R or O O
X or X2 or C C
Trane Products [American Standard]
B C 24VAC power (to power thermostat)
X2 Emergency heat (do not connect, tape off)
Zoned Hot Water
2 wire
Your Wires Thermostat Terminal
R RH
W W
3 Wire
Motor Driven Valves
R or 5 RH (power)
W or 4 W(heat ON)
Y or G or 6 (the 3rd wire) A(heat OFF)
3 Wire
Solenoid Valves
R RH (power)
W A (heat ON)
Y or G (the 3rd wire) W (heat OFF)
Customer support:
www.radiothermostat.com or 877-602-5028 ea-