Ct50 User Manual 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.  
top cover  
Reset  
button  
HVAC  
selection  
switches  
Wire  
terminals  
Save  
Energy  
button  
Mode  
button  
DA  
Y
AU  
TO  
PM  
RA  
DIO  
Insulation  
indicator  
F
1
LI  
NK  
Fan  
button  
TA  
RGET  
TE  
M
P
COOL  
MENU  
button  
PROG  
button  
bottom  
cover  
Caution  
To avoid electrical shock  
Touch screen  
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.  
1014-001-001  
ENGLISH  
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 identification.  
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.  
W
• Make sure the wires do not fall back inside the wall. You can  
wind them around a pencil to keep them from falling.  
G
C
• Loosen all screws on the old thermostat and remove it from the  
wall.  
PG 3  
PG 4  
What wires do you have?  
Make sure your wires are labeled. This may require you to find  
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.  
from HVAC  
System  
wire  
Jumper  
IMPORTANT: If you have both RH and RC you need to  
remove the jumper wire between these 2 terminals.  
2.6"  
Prepare Wires  
Y
R
H
R
C
G
A
W
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.  
Wire Terminals  
Find the step-by-step diagram for your system  
• Select the referenece  
page with your wiring  
diagram and set-up  
information below.  
C W RH  
Go To Page 13  
from  
r
2 Wire  
Heat  
HVAC  
C W Y RH G C W Y RH RC G  
C W RH G  
from  
from  
from  
3 Wire  
Heat  
4 Wire  
Heat/Cool  
5 Wire  
Heat/Cool  
HVAC  
HVAC  
HVAC  
• The C-wire is optional but  
prefered for all installations  
[shown dotted in diagrams].  
Some radio modules will  
require the 24VAC C-wire  
power.  
W RH A  
from  
3 Wire  
Zoned  
Hot Water  
Go  
HVAC  
W
W
W
G
To  
Page 16  
Go To Page 13  
Go To Page 14  
Go To Page 14  
• 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.  
C B or O Y RH G  
C B or O W2 Y RH G C W2 W Y Y2 RH G  
from  
from  
from  
5 Wire  
Heat Pump  
4 Wire Heat Pump  
w/o Aux Heat  
2 stage Cool  
2 stage Heat  
HVAC  
HVAC  
HVAC  
w/ Aux Heat  
B
B
H
W
2
G
G
R
Go To Page 15  
Go To Page 15  
Go To Page 16  
PG 5  
PG 6  
from HEAT/COOL system  
• “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 fit snugly to the wall.  
W
C
B
O
W
W
2
Y
Y
Caution  
2
R
H
R
C
G
A
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 first, 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).  
Mount the CT50 to Wall  
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 first and drill a 3/16-in.(4.8mm) hole for the insert at each  
screw location, then mount the unit.  
CT50  
Wires  
from  
HEAT/COOL  
system  
C
B
O
W
W
2
Y
Y
2
RH  
RC  
G
Place wires like this  
A
C
B
O
W
W
2
Y
Y
2
RH  
RC  
G
A
Wall  
anchor  
Screw to wall  
PG 7  
PG 8  
T
E
S
E
R
P
H
EC  
EL  
M
R
O
N
AS  
G
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.  
T
A
E
H
C
A
V
H
E
C
R
U
O
S
E
P
Y
T
• 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.  
AA  
AA  
2
Install 3 AA Batteries  
3
AA  
1
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 first 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 configured to operate your  
HVAC system yet. You must now configure your thermostat for your HVAC system.  
Caution  
Special Battery Warning  
Always replace the batteries as soon as the “Low Batt” flashes. 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 flash, 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 9  
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 first  
[pg 8].  
HVAC  
SETUP  
• 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.  
HEAT  
2ND  
STG COOL  
If you have a Normal HVAC system and  
you want fast temperature recovery...  
If you have a HEAT PUMP HVAC  
system...  
HEAT and COOL  
select 1  
2 stage HEAT, 1 stage COOL select 2  
2 stage HEAT, 2 stage COOL select 3  
HEAT PUMP with AUX heat select A  
(fast recovery)  
If you want efficient [but slower] recovery...  
2 stage HEAT, 1 stage COOL select 4  
2 stage HEAT, 2 stage COOL select 5  
HEAT PUMP with AUX heat select b  
(efficient recovery)  
HEAT PUMP no AUX heat  
select C  
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.  
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 11  
PG 12  
Congratulations, you have successfully installed your unit. Please proceed to  
the OPERATING Guide to initialize the CT50.  
MODE  
control  
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  
.
DA  
Y
AU  
TO  
PM  
RADI  
O
F
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.  
1
LI  
NK  
TA  
RG  
ET  
TE  
M
P
C
O
O
L
FAN  
control  
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.)  
Step-by-Step Wiring Diagrams  
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.  
HVAC SYSTEM  
C
W
R
POWER  
Your heater is now connected to the CT50.  
Please Go To Page 6  
Thermostat  
Terminals  
C B O  
W
W2  
Y Y2 RH RC G A  
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:  
HVAC SYSTEM  
If you have gas or oil heat, set the HEAT TYPE to GAS.  
POWER  
C
W
R
G
If you have electric heat, set the HEAT TYPE to ELEC.  
Your system is now connected to the CT50.  
Please Go To Page 6  
Thermostat  
Terminals  
C B O  
W
W2  
Y Y2 RH RC G A  
PG 13  
PG 14  
W Y RH G  
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:  
HVAC SYSTEM  
C
W
Y
R
G
REMOTE POWER  
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.  
Thermostat  
Terminals  
C H B O  
W
W
2
Y Y2 RH RC G A  
Please Go To Page 6  
W Y RH RC G  
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.  
HVAC SYSTEM  
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.  
RH RC  
C
W
Y
G
POWER  
Thermostat  
Terminals  
C B O  
W
W
2
Y Y2 RH RC G A  
Your HVAC system is now connected to the CT50.  
Please Go To Page 6  
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.  
HEAT PUMP SYSTEM  
POWER  
C
O
B
Y
R
G
or  
or  
Your HVAC system is now connected to the CT50.  
Please Go To Page 6  
C B O  
Terminals  
W
W
2
Y Y2 RH RC G A  
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.  
HEAT PUMP SYSTEM  
STEP 4 - Connect the R wire to RH terminal. This connects the power.  
W2  
REMOTE POWER  
C
O
or  
B
Y
R
G
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.  
or  
C H B O  
W
W
2
Y Y2 RH RC G A  
Terminals  
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  
PG 15  
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  
HVAC SYSTEM  
W2 Y2 RH RC  
the power.  
C
W
Y
G
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.  
REMOTE  
POWER  
C H B O  
W
W
2
Y Y2 RH RC G A  
If you have electric heat, set the HEAT TYPE to ELEC.  
erminals  
T
Your HVAC system is now connected to the CT50.  
Please Go To Page 6  
W RH [A?]  
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  
Motor Valve  
page 18).  
Solenoid Valve  
W
R
A
A
W
R
C B O  
W
W
2
Y Y2 RH RC G A  
C H B O  
erminals  
W
W
2
Y Y2 RH RC G A  
erminals  
T
T
Wire Reference Chart  
Possible WiresWhat They Control  
R or V or VR  
RH and RC Single power for HEAT and COOL  
RH or 4  
RC  
W
RH Power for HEAT (RH not connected to RC jumper clip removed)  
RC Power for COOL (RH not connected to RC jumper clip removed)  
W Heat control  
W2  
W2 2nd stage HEAT or heat pump auxiliary heat  
W3  
Y
Y2  
W3 3rd stage HEAT or 2nd stage of 2 stage auxiliary heat  
Y COOL control or 1st stage compression for heat pump  
Y2 2nd stage COOL control or 2nd stage compression for a heat pump  
G or F  
C or X  
G FAN control  
C 24VAC power (to power thermostat)  
NOTE: TRANE uses B for this connection  
H
H External Humidifier  
DH  
EX  
B
DH External De-Humidifier  
EX external fresh air baffle  
B Heat pump changeover (cool to heat, powered in heat)  
O Heat pump changeover (heat to cool, powered in cool)  
O
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
L
T
n/a Emergency heat (do not connect, tape off)  
n/a System monitor (do not connect, tape off)  
n/a Outdoor sensor (do not connect, tape off)  
PG 17  
PG 18  
Lennox Heat Pump  
V or VR or R  
M or Y  
Y or W or W2  
F or G  
RH Power for HEAT  
Y COOL control  
W2 2nd stage HEAT  
G Fan control  
O
R or O  
X or X2 or C  
C
Trane Products [American Standard]  
B
C 24VAC power (to power thermostat)  
W or W1  
X2  
W2 2nd stage HEAT  
Emergency heat (do not connect, tape off)  
Zoned Hot Water  
2 wire  
Your Wires  
Thermostat Terminal  
R
W
RH  
W
3 Wire  
Solenoid Valves  
3 Wire  
R
W
RH (power)  
(heat ON)  
W (heat OFF)  
Motor Driven Valves  
R or 5  
W or 4  
A
RH (power)  
W (heat ON)  
Y or G (the 3rd wire)  
Y or G or 6 (the 3rd wire)  
A (heat OFF)  
Customer support: [email protected] 888-607-5824 or www.radiothermostat.com  

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