Radio Thermostat CT50 User manual

PG 1
Install Guide CT50
Caution
• Your thermostat is a precise instrument, handle it 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 24 volt AC and
millivolt systems (with a separate 24VAC power adapter).
• This thermostat requires 24VAC power at the “C” terminal.
• Each thermostat relay load should be limited to 1.0 amp;
higher amperage may cause damage to the thermostat.
Caution
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.
ENGLISH
1014-001-001
Save
Energy
button
Insulation
indicator
top cover
Touch screen
Wire
terminals
Mode
button
Fan
button
MENU
n
PROG
butto
Reset
button
HVAC
selection
switches
bottom
cover
DAY
F
LINK
RADIO
TARGET TEMP
1
COOL
AUTO
PM
n
butto

PG 2
TOOLS
You will need a small Phillips screwdriver and a drill with 3/16-in. (4.8mm) bit for wall mounts.
LOCATION
Replacement installations - mount the CT50 in place of the old thermostat.
A new location will require moving your wiring.
For new installations and relocating the CT50 - 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 CT50 until all construction and painting has
been completed.
• This thermostat does not require leveling.
Good
5ft.
(1.5m)

PG 2
PG 3
REMOVE OLD UNIT
Switch OFF electricity to the HEATING and COOLING systems.
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.
Caution
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 lettered 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

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 CT50 runs on 3 AA alkaline batteries and/or the C wire if available. If you do
not have a C wire you can run a new wire from the HVAC or use a standard 18-24V [AC or DC] wall
transformer. A constant power source is required when using a radio module.
IMPORTANT: If you have both RH and RC you need to
remove the jumper wire between these 2 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 CT50.
• 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.
• When handling, take care not to damage the labels for each wire.
G
CYRH
W
2.6"
from HVAC
System
Jumper
wire
Wire Terminals
Y
RH RC
G A

PG 4
PG 5
Find the step-by-step diagram for your system
• Select the referenece
page with your wiring
diagram and set-up
information below.
• The C-wire is optional but
prefered for all installations
[shown dotted in diagrams].
Some radio modules will
require the 24VAC C-wire
power.
• If your combination of
wires is not above you can
use the wiring table at the
end if the install section to
determine your connections.
Contact customer support
for help.
G
C W Y RH RC G
5 Wire
Heat/Cool
From
Furnace
RC
CYRH
W
C W Y RH G
4 Wire
Heat/Cool
From
Furnace
G
C
YRH
W
C W RH G
3 Wire
Heat
From
Furnace
CRHG
W
From
Furnace
C
W
C W RH
RH
2 Wire
Heat
From
Furnace
WRH
A
W RH A
3 Wire
Zoned
Hot Water
WIRES
WIRES WIRES WIRES
WIRES
G
RH
C W2 W Y Y2 RH G
2 stage Cool
2 stage Heat
From
Furnace
Y
2
C
WY
W
2
C B or O W2 Y RH G
5 Wire
Heat Pump
w/ Aux Heat
From
Furnace
RH
CO
or
W2
B
G
Y
G
C B or O Y RH G
4 Wire Heat Pump
w/o Aux Heat
From
Furnace
RH
CO
or
Y
B
WIRES WIRES WIRES
Go To Page 13
Go To Page 13 Go To Page 14
Go To Page 14
Go
To
Page 16
Go To Page 15 Go To Page 15 Go To Page 16
from
HVAC
from
HVAC
from
HVAC
from
HVAC
from
HVAC
from
HVAC
from
HVAC
from
HVAC

PG 6
• “Fan out” wires as illustrated with CT50 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 CT50 to t snugly to the wall.
Caution
Do not allow wires to touch each other or parts on thermostat.
• Wires will position behind the CT50 and up over the
terminal area.
• Do not bunch wires behind the CT50. 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 CT50 to the wall rst, and then connect the wires.
• The CT50 can be externally powered with a power source rated from 18V to 24V, AC or DC, at
100ma or greater. If used, connect to the C and RH terminals (no polarity).
CBOW
W2
Y
Y2 RHRC
GA
RH
YG
C
W
from HEAT/COOL system

PG 6
PG 7
Mount the CT50 to Wall
1. Hold the CT50 against the wall, with the wires coming over the top;
above terminal block. The CT50 will cover the hole in the wall.
2. Position CT50 for best appearance.
3. Attach the CT50 to the wall with the screws provided.
4. If you are mounting the CT50 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.
Screw to wall
Place wires like this
CBOW
W2
Y
Y2 RHRC
GA
from
HEAT/COOL
system
CBOW
W2
Y
Y2 RHRC
GA
CW
Y
RH
G
Wall
Wires
Wall
anchor
CT50

PG 8
HVAC Selection
• Set the HVAC TYPE switch in the NORM position if you have
conventional natural gas, propane, oil, or electric heat. If you
have a HEAT PUMP system set the HVAC TYPE switch to HP.
• Set the HEAT SOURCE switch in the GAS position if you have normal gas or oil heat or if you have
a heat pump with gas or oil auxiliary heat. Put the HEAT SOURCE in the ELEC position if you have
normal electric heat or if you have a heat pump with electric auxiliary heat.
IMPORTANT: Press the RESET button (under top cover) to implement the HVAC switch
selections/changes.
Install 3 AA Batteries
This is a 24VAC thermostat, the 3 AA batteries are
for memory backup only and are not required for
operation.
• Install 3 AA alkaline batteries [required] following the marked polarity in the battery compartment.
Put the lower battery in negative end rst against the spring, then push the positive end in. Then
insert the last 2 batteries as shown.
• With all the wires connected it is time to turn the AC power back on. Do this at the breaker you used
to switch it off. The CT50 will power-up in the OFF mode. Your CT50 is not congured to operate your
HVAC system yet. You must now congure your thermostat for your HVAC system.
GAS ELEC
NORM HP
RESET
HVAC
TYPE
HEAT
SOURCE
AA
AA
AA
1
2
3

PG 8
PG 9
Caution
Special Battery Warning
Always replace the batteries as soon as the “Low Batt” ashes. The thermostat requires batteries for
mempry back-up. You must be responsible to replace batteries before they run out. Failure to replace
batteries can result in overheating or excessive cooling of your house.
• Even if the “Low Batt” indicator does not ash, you should always replace the batteries at least once a
year. Replacing the batteries also helps to prevent leakage that can corrode and damage the thermostat.
• If you are leaving your home for a month or more, you should replace the batteries as a precaution
against battery failure in your absence.
• Always use new alkaline batteries.
• Failing to replace the batteries, when necessary, could cause the thermostat to lose power or
malfunction. If the thermostat loses power, then the thermostat will not control the temperature which
could result in your HVAC system not functioning as you intended and lead to possible damage from
overheating or excessive cooling.
• If the thermostat batteries fail with the heat OFF, this can result in NO HEAT and possible frozen or
broken pipes and water damage.
• If the thermostat batteries fail with the cool OFF, this can result in NO COOL and could cause possible
damage or excessive temperatures.

PG 10
HVAC Setup on Screen
IMPORTANT: Make sure the CT50 is powered up and the
mode is set to OFF. HVAC selection switches must be set rst
[pg 8].
• With mode in OFF press MENU and touch HVAC SET UP.
• Use +/- icons to select HVAC SET UP number on screen.
The LCD display will show your selection and indicate the
number of stages you have selected. During setup, 2nd stage
will blink when both heat and cool have 2nd stages.
If you have a Normal HVAC system and
you want fast temperature recovery...
HEAT and COOL select 1
2 stage HEAT, 1 stage COOL select 2
2 stage HEAT, 2 stage COOL select 3
If you want efcient [but slower] recovery...
2 stage HEAT, 1 stage COOL select 4
2 stage HEAT, 2 stage COOL select 5
NOTE: For 2 stage systems your CT50 can recover from a temperature setback in 2 ways: 1] Fast Recovery - This uses your 2nd
stage to bring the house to Target Temperature. This may use slightly more energy. 2] Efficient Recovery -This uses the 2nd stage to
bring your house to within a few degrees of the Target Temperature and then uses the 1st stage to go the last bit. (See setting the dif-
ferential in the operating guide). This is more efficient.
HEAT
2
ND
STG
HVAC
SETUP
COOL
If you have a HEAT PUMP HVAC
system...
HEAT PUMP with AUX heat select A
(fast recovery)
HEAT PUMP with AUX heat select b
(efcient recovery)
HEAT PUMP no AUX heat select C

PG 10
PG 11
Test Installation
Follow these procedures to verify you have correctly installed
the CT50.
TO CHECK FAN (If you connected the G wire):
Press the fan button to turn the fan ON.
Verify that air is blowing from the system.
Press the fan button again to return to AUTO.
TO CHECK HEAT
Set the mode to HEAT by pressing the MODE button until HEAT is displayed.
Touch the temperature display to bring up the MANUAL screen.
Touch the + icon and raise the Target Temperature to 90oF; allow the system 2 minutes to
respond. Verify that heat is blowing from the system. Return the Target Temperature to a
nomal setting. Return mode to OFF by pressing the mode button.
If you have a heat pump, leave in off for 4 minutes before checking COOL.
TO CHECK COOL (do not operate AC if the outside temp is below 65oF)
Set the mode to COOL by pressing the MODE button until COOL is displayed.
Touch the - icon to lower cool Target Temperature to 50oF.
Allow the system 5 minutes to respond.
Verify that cool air is blowing from the system.
Return mode to OFF.

PG 12
Congratulations, you have successfully installed your unit. Please proceed to
the OPERATING Guide to initialize the CT50.
IMPORTANT: After you have labeled and connected
your wires, followed the correct HVAC setup, and your
system still does not operate, contact support@
radiothermostat.com or 888-607-5824 8am-midnight EST .
STATEMENT OF USE: This thermostat can be used with
24VAC (C wire), heating and cooling systems and also
millivolt heating (w/ 24VAC adapter). 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 the compressor from damage.
The CT50 must be externally powered with a power source
rated from 18V to 24V, AC or DC, at 100ma or greater. Connect 24VAC to the C and RH terminals (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. (The 3 AA batteries are for memory backup only and are not required
for operation.)
DAY
F
LINK
RADIO
TARGET TEMP
1
COOL
AUTO
PM
MODE
control
FAN
control

PG 12
PG 13
Step-by-Step Wiring Diagrams
WIRES
2 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 - Set HVAC selection switches to NORMAL and GAS.
Your heater is now connected to the CT50.
Please Go To Page 6
WIRES
3 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 - Set HVAC selection switches to NORMAL and:
If you have gas or oil heat, set the HEAT TYPE to GAS.
If you have electric heat, set the HEAT TYPE to ELEC.
Your system is now connected to the CT50.
Please Go To Page 6
W
R
C
C H B O
W
2
W
Y Y2 RH RC G A
RADIO POWER
W
R G
C
HVAC SYSTEM
REMOTE POWER
C H B O
W
2 W Y Y2 RH RC G A
AC SYSTEM
HV
Thermostat
Terminals
Thermostat
Terminals

PG 14
W Y RH G
WIRES
4 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 RH or R 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 - Set HVAC selection switches to NORMAL and:
If you have gas or oil heat, set the HEAT TYPE switch to GAS.
If you have electric heat, set the HEAT TYPE switch to ELEC.
Your HVAC system is now connected to the CT50.
Please Go To Page 6
W Y RH RC 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 to the cooling compressor.
STEP 3 - Disconnect the jumper between RH and RC terminals.
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 - Set HVAC selection switches to NORMAL and:
If you have gas or oil heat, set the HEAT TYPE to GAS.
If you have electric heat, set the HEAT TYPE to ELEC.
Your HVAC system is now connected to the CT50.
Please Go To Page 6
Thermostat
Terminals
Y W R G C
HVAC SYSTEM
REMOTE POWER
C H B O
W
2 W Y Y2 RH RC G A
Y W
RH RC G
C
HVAC SYSTEM
REMOTE POWER
C H B O
W 2
W Y Y2 RH RC G A
Thermostat
Terminals

PG 14
PG 15
4 Wire 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 to Y terminal. This connects the compressor.
STEP 3 - Connect the R wire to RH. This connects the power.
STEP 4 - Connect the G wire to the G. This connects the fan.
STEP 5 - Set HVAC selection switch to HEAT PUMP and set the HEAT.
TYPE to ELEC.
Your HVAC system is now connected to the CT50.
Please Go To Page 6
5 Wire Heat Pump w/ Aux 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 W2 wire to W2 terminal. This connects the auxiliary heat.
STEP 3 - Connect the Y wire to Y terminal. This connects the compressor.
STEP 4 - Connect the R wire to RH terminal. This connects the power.
STEP 5 - Connect the G wire to G terminal. This connects the fan.
STEP 6 - Set HVAC selection switches to heat pump and:
If you have gas or oil auxiliary heat, set the HEAT TYPE to GAS.
If you have electric auxiliary heat, set the HEAT TYPE to ELEC.
Your HVAC system is now connected to the CT50.
Please Go To Page 6
POWER
Terminals
YB R G C
HEAT PUMP SYSTEM
O
C B O W 2 W Y Y2 RH RC G A
or
or
C H B O W
2
W Y Y2 RH RC G A
Terminals
Y
W2
B R G C
HEAT PUMP SYSTEM
O
REMOTE POWER
or
or

PG 16
2 Stage Heat and 2 Stage Cool
STEP 1 - Connect the W wire to the W terminal. This connects the 1st Stage of HEAT.
STEP 2 - Connect the W2 wire to the W2 Terminal. This connects the 2nd Stage of HEAT.
STEP 3 - Connect the Y wire to the Y terminal. This connects the 1st Stage of COOL.
STEP 4 - Connect the Y2 wire to the Y2 terminal. This connects the 2nd Stage of COOL.
STEP 5 - Connect the RH or R wire to the RH terminal.This connects
the power.
STEP 6 - Connect the G wire to the G terminal. This connects the fan.
STEP 7 - Set HVAC selection switches to NORMAL and:
If you have gas or oil heat, set the HEAT TYPE to GAS.
If you have electric heat, set the HEAT TYPE to ELEC.
Your HVAC system is now connected to the CT50.
Please Go To Page 6
W RH [A?]
WIRES
3 Wire Zoned Hot Water
For Solenoid valve or Motor valve connect the wires based on diagrams below to the correct terminal
on the CT50. USE ONLY IN HEAT MODE. The third wire on your valve may be called 6, Y, or G (see
page 18).
Terminals
Y2
W Y
RH RC G
C
HVAC SYSTEM
REMOTE
POWER
C H B O W 2 W Y Y2 RH RC G A
W2
W RA
Motor Valve
C H B O
W 2
W Y Y 2 RH RC G A
R
A
C H B O W 2 W Y Y 2 RH RC G A
W
Solenoid Valve
TerminalsTerminals

PG 16
PG 17
Wire Reference Chart
Possible WiresWhat 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 jumper clip removed)
RC RC Power for COOL (RH not connected to RC jumper clip removed)
W W Heat control
W2 W2 2nd stage HEAT or heat pump auxiliary heat
W3 W3 3rd stage HEAT or 2nd stage of 2 stage auxiliary heat
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 uses B for this connection
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 there are both B and O wires (Trane pump
products) DO NOT CONNECT B to B terminal, connect B to C
terminal. If not a Trane product tape off B.
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 18
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)
W or W1 W2 2nd stage HEAT
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: [email protected] 888-607-5824 or www.radiothermostat.com