Honeywell Thermostat CT3650 User Manual

Honeywell CT3650  
PROGRAMMABLE THERMOSTAT  
OWNERS GUIDE  
Seven Day  
Programmable Heat and/or Cool  
Low Voltage (20 to 30 Vac) Thermostat and Wallplate  
Model CT3650  
Para pedir estas instrucciones en español, llame al 1-800-468-1502.  
Pour obtenir ce ode demploi en français, composer le 1-800-468-1502.  
Table of Contents  
Step 1. Prepare for Installation ...................................................................................................................................  
Step 2. Remove Old Thermostat ................................................................................................................................  
Step 3. Mount thermostat Wallplate ...........................................................................................................................  
Step 4. Wire Wallplate Terminals ................................................................................................................................  
Step 5. Install the Batteries ........................................................................................................................................  
5
6
7
8
9
Step 6. Mount the Thermostat .................................................................................................................................... 10  
Step 7. Customize Your Thermostat ........................................................................................................................... 11  
Step 8. Set the Clock .................................................................................................................................................. 13  
Step 9. Programming ................................................................................................................................................. 13  
Step 10. Operating Your Thermostat .......................................................................................................................... 17  
Step 11. Set the Fan and System Key ....................................................................................................................... 18  
If You Have a Problem ................................................................................................................................................ 19  
Smart Response™ Technology .................................................................................................................................. 20  
Wiring Diagrams ......................................................................................................................................................... 21  
® U.S. Registered Trademark  
Copyright © 2001 Honeywell •  
•All Rights Reserved  
 
69- 1285- 2  
TIME /TIME  
SETS TIME  
FORWARD OR BACK  
DIGITAL DISPLAY  
RAISES  
TEMPERATURE SETTING  
SET CURRENT  
DAY/TIME  
SETS CURRENT  
TIME AND DAY  
LOWERS  
TEMPERATURE SETTING  
DISPLAYS  
CURRENT HEAT/COOL  
TEMPERATURE SETTING  
RUN PROGRAM  
RETURNS  
THERMOSTAT  
TO NORMAL  
OPERATING MODE  
Time  
Set Program  
Leave  
PROGRAM PERIODS  
WAKE/LEAVE/RETURN/SLEEP:  
ENTERS PROGRAMMING MODE  
Set Current  
Day/Time  
Run  
Program  
Wake  
Return  
Sleep  
HOLD TEMP  
SETS A HOLD  
TEMPERATURE  
SETTING AND  
ACTIVATES  
Heat/Cool  
Settings  
Hold Temp  
Day  
HEAT/COOL SETTING  
SWITCHES BETWEEN  
HEAT SETPOINTS AND  
COOL SETPOINTS  
Daylight  
Time  
Copy  
Fan  
System  
VACATION HOLD  
FEATURE  
WHILE PROGRAMMING  
SYSTEM KEY  
SELECTS HEAT/OFF/COOL  
DAYLIGHT TIME  
SELECTS STANDARD  
TIME OR DAYLIGHT  
SAVINGS TIME  
FAN KEY  
SELECTS AUTO/ON  
COPY  
COPY SETTINGS FROM ONE DAY TO  
ANOTHER DAY FOR QUICK PROGRAMMING  
DAY  
SETS DAY OF THE WEEK  
M18596  
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DISPLAYS EITHER CURRENT  
TIME OF DAY OR PROGRAM TIMES  
SHOWS THERMOSTAT IS IN  
THE SET DAY/TIME MODE  
SHOWS WHEN  
THERMOSTAT IS IN THE  
PROGRAMMING MODE  
SHOWS TEMPERATURE SETTING  
CHANGED FOR THIS PROGRAM PERIOD  
SHOWS VACATION  
HOLD DURATION  
SHOWS THE TEMPERATURE  
DISPLAYED IS THE CURRENT  
SET TEMPERATURE  
Temporary Setting  
Set Program  
Hold for  
Em Ht  
Set Day/Time  
AM  
SHOWS CURRENT  
DAY OR DAYS BEING  
PROGRAMMED  
Room  
Humid  
SHOWS THE TEMPERATURE  
DISPLAYED IS THE CURRENT  
ROOM TEMPERATURE  
Aux Ht  
MonTueWedThuFriSatSun Days  
WakeLeaveReturnSleep  
System  
Outdoor  
In Recovery Filter  
DST  
Fan  
Wait On Auto  
Repl Batt  
SHOWS CURRENT  
PROGRAM PERIOD  
OR PERIOD BEING  
PROGRAMMED  
SHOWS THE BATTERIES ARE  
LOW AND MUST BE  
REPLACED  
Heat  
Off Cool  
Auto  
Em  
DISPLAYS EITHER ROOM  
OR SET TEMPERATURES  
SHOWS CURRENT  
SYSTEM KEY POSITION  
HEAT/OFF/COOL  
SHOWS CURRENT FAN  
KEY POSITION ON/AUTO  
SHOWS THAT THERMOSTAT IS  
"CALLING" FOR HEAT OR COOL  
SHOWS THERMOSTAT IS  
CALLING FOR THE FAN  
SHOWS SYSTEM ON DAYLIGHT SAVINGS TIME  
SHOWS THERMOSTAT IS PROCESSING  
SHOWS SMART RESPONSE IS OFF.  
CONVENTIONAL RECOVERY IS ON  
INFORMATION AND WAITING TO CALL FOR HEAT OR COOL  
SHOWS SMART RESPONSE IS CHANGING  
THE TEMPERATURE TO MEET THE  
CURRENT PROGRAMS  
M18636  
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STEP 1. PREPARE FOR INSTALLATION  
Check Table 1, the compatibility chart, to make sure the thermostat is compatible with your system. If your system  
is not compatible, call Honeywell Customer Relations Center, toll-free, 1-800-468-1502.  
Table 1. Compatibility Chart.  
System Type  
Compatibility with CT3650  
Yes  
Gas Standing Pilot  
Gas Electronic Ignition  
Gas-fired Boilers  
Yes  
Yesa  
Yes  
Gas 750 Millivolt Heat  
Yesa  
Yes  
Yes  
Yes  
No  
Oil-Fired Boilers  
Oil-Fired Furnace  
Electric Furnace  
Electric Air Conditioning  
Baseboard Electric (120/240 line volt)b  
Single Stage Heat Pump  
Yes  
No  
Multistage Heat Pumps/Multistage Equipment  
a
Compatible with 2-wire Honeywell and Taco zone valves. Not compatible with 3-wire zone valves or 2-wire White  
Rodgers no. 1361 zone valves.  
Not compatible with any 120/240 volt system.  
b
Package Contents  
Thermostat  
Screws and anchors  
3 Energizer® AA batteries  
Wallplate  
Wiring labels  
Owners manual  
Tools Required  
Screwdriver  
Drill  
5
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STEP 2. REMOVE OLD THERMOSTAT  
Test your heating and cooling systems to make sure they work properly. If either system does not work, contact  
your local heating/air-conditioning dealer. To avoid compressor damage, do not operate the cooling system when  
outdoor temperature is below 50°F (10°C).  
Turn off power to the system at the furnace or the fuse/circuit breaker panel.  
Carefully unpack your new thermostat and wallplate. Save package of screws, instructions, and receipt.  
Remove the cover from the old thermostat. If the cover does not snap off when pulled firmly from the bottom, check  
for a screw or screws used to lock on the cover.  
Loosen the screw or screws holding the thermostat to the wallplate and lift the thermostat away.  
Disconnect the wires from the old thermostat. As you disconnect each wire, attach the enclosed labels with the old  
terminal designation. If there are only two wires, they do not need to be labeled. Wrap the wires around a pencil as  
shown to keep them from falling back into the wall.  
Special Installations  
Read this section if you are replacing:  
WIRES THROUGH  
WALL OPENING  
Clock thermostat with separate wires for the clock.  
Thermostat with six or more wires connected to it.  
Thermostat in a heating only system with three wires.  
M5136  
Replacing a Clock Thermostat that has C or C1 Clock Terminals  
If you are replacing a Honeywell Chronotherm®Thermostat, you may find one or two wires going to the C or C1 clock  
terminals on the Chronotherm wiring wallplate. Do not allow them to touch, or you can damage the transformer.  
Disconnect the wires and wrap them separately using electrical tape. Do not wrap them together. Place the wires  
where they will not interfere with the operation of the new thermostat. Record the colors and terminal designation  
labels of the remaining wires.  
Replacing a Thermostat that has Six or More Wires  
If there are six or more wires (excluding clock wires attached to terminals), you probably have a variation of a  
multistage heat pump or other multistage system. This thermostat is not compatible with multistage systems, so return  
the product to the place of purchase. For information about which programmable thermostats will work with your  
system, call Honeywell Customer Relations Center, at 1-800-468-1502.  
Replacing a Thermostat that has Three Wires  
If you have three wires for a heating only system and can operate the fan using the fan ON switch this thermostat works  
with your system. However, some hot water (zoned) heating systems also have three wires. Your thermostat will work  
only if you install an isolating relay on these systems. For details, call your local heating and/or cooling contractor.  
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STEP 3. MOUNT THERMOSTAT WALLPLATE  
Separate the wallplate from the thermostat by placing your thumb or fingers  
between the bottom of the wallplate and the thermostat, and pulling the  
wallplate up and away from the thermostat. See illustration at right.  
Position the wallplate on the wall. Level the wallplate for appearance if desired.  
Use a pencil to mark the two mounting holes that best fit the application.  
Remove the wallplate from the wall. Drill two 3/16 in. holes in wall (if drywall) as  
shown. For materials such as plaster or wood, drill 7/32 in. holes where marked.  
Gently, tap the (provided) anchors into the drilled holes until they are flush with  
the wall.  
Reposition the wallplate over the holes. Pull the wires through the wiring  
opening. Loosely insert mounting screws into each of the holes.  
Level the wallplate if desired. Thermostat functions properly when not level.  
Tighten mounting screws.  
M16427  
WALL  
WIRES  
THROUGH WALL  
WALL  
ANCHORS (2)  
MOUNTING  
HOLES  
MOUNTING  
SCREWS  
M15044  
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STEP 4. WIRE WALLPLATE TERMINALS  
IMPORTANT  
All wiring must comply with local codes and ordinances. If  
unsure about household wiring procedures, call your local heat-  
ing/air-conditioning contractor.  
Refer to the labels you placed on the wires when you removed the old  
thermostat (see illustration).  
Match the letter of your old thermostat wire with the corresponding  
terminal letter on your new thermostat. Refer to Table 2.  
Remove the factory-installed jumper connecting terminals R and RC if  
wires are connected to both of those terminals.  
For wiring diagrams, if needed, see pp 21-22.  
Loosen the terminal screws. Slip each wire beneath its matching  
terminal. Wraparound and straight connections are both acceptable,  
(see illustration). Tighten the terminals.  
FOR WRAPAROUND  
INSERTION STRIP  
7/16 IN. (11 MM).  
FOR STRAIGHT INSERTION  
STRIP 5/16 IN. (8 MM).  
M16425  
M4826  
Plug the hole in the wall with insulation to help prevent drafts from adversely affecting thermostat operation.  
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Table 2. Terminal Designations on Old and New Thermostats.  
Terminal on Old Thermostat Connect To Description  
R, RHa, 4, V  
R
Power  
Rc, Ra  
W, W1, H  
Y, Y1, M  
G, F  
Rc  
Power for cooling  
W
Y
Heat  
Cooling  
G
O
Fan  
O
Changeover in cool. (Single stage heat pump only).  
Changeover in heat. (Single stage heat pump only).  
Bb  
Bb  
Cc, Xc, Bb  
W2, H2  
Y2  
Do not connect.  
Transformer common  
Do not continue installation. Second stage heat.  
Call 1-800-468-1502.  
Second stage cool.  
a
If both RH and R terminals are present on existing thermostat, remove jumper and connect Rh to R and R to Rc.  
Do not connect both O and B when wiring to a single stage heat pump. Connect O to O. Tape off B.  
Tape off end of the wire with electrical tape and push the taped wire back into the wiring hole in the wall.  
b
c
WALLPLATE  
STEP 5. INSTALL THE BATTERIES  
B
R
IMPORTANT  
Three AA alkaline batteries are included with the thermo-  
stat. Batteries must be installed for programming and opera-  
tion of the thermostat and the heating/cooling system.  
RC  
O
W
Y
G
Install the batteries in the wallplate so the positive terminals all  
point up (see illustration).  
If the thermostat is already mounted on the wall, remove the  
thermostat by placing your thumb between the thermostat and  
wallplate and pulling the thermostat up and away as shown.  
INSTALL 3 AA ALKALINE BATTERIES  
AS SHOWN, POSITIVE (+) TERMINALS  
TOWARD TOP.  
M10622  
9
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When the batteries are running low, a REPL BAT message flashes for one to  
two months before the batteries run out completely. Replace the batteries as  
soon as possible once the message flashes.  
IMPORTANT  
Although the thermostat has a low battery indicator, replace the  
batteries once per year to prevent leakage and to prevent the ther-  
mostat and heating/cooling system from shutting down due to lack  
of battery power in the thermostat.  
If you insert new batteries within 20 to 30 seconds of removing the old  
batteries, the system retains the current time and day. If the display is blank,  
the batteries are dead or installed incorrectly. You must reset the time and  
day. Refer to Set the Clock for instructions.  
M16424  
As a precaution when leaving home for longer than a month, change batteries before leaving to prevent  
the system from shutting down due to lack of power. Always use fresh alkaline batteries. Nonalkaline  
batteries do not last as long. They also can leak, causing damage to the thermostat and the wall surface.  
Honeywell recommends Energizer® batteries.  
STEP 6. MOUNT THE THERMOSTAT  
A. ENGAGE TABS AT TOP  
OF THERMOSTAT  
AND WALLPLATE.  
B. PRESS LOWER  
EDGE OF CASE  
TO LATCH.  
M12703  
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STEP 7. CUSTOMIZE YOUR THERMOSTAT  
Your Honeywell CT3650 thermostat comes preset to the most commonly used settings. The settings are:  
Gas or oil forced air furnace.  
Smart Response technology on.  
Temperature °F.  
12-hour clock format.  
You can change any or all of these settings.  
IMPORTANT  
Always press the keys with your fingertip or a similar blunt tool. Sharp instruments like pens and pencil  
points can damage the keyboard.  
Press and hold down  
,
, and  
, simultaneously until the screen shows.  
You now can change any of these settings.  
Fan Operation (Feature Number 2)  
Fan operation options are:  
OPTION  
M13347  
FEATURE  
NUMBER  
0 = Gas or oil furnace. Furnace controls fan operation during heating (preset).  
1 = Electric furnace or single stage heat pump. Thermostat controls fan operation during heating.  
To change fan operation:  
Press  
once.  
Run  
Program  
Press Time  
to move to next feature or  
to return to main display.  
System Type (Feature Number 4)  
System type options are:  
1 = Gravity or steam system.  
3 = Hot water, high efficiency furnace (90% or better), or single stage heat pump.  
6 = Gas or oil forced air furnace (preset).  
M13348  
9 = Electric furnace.  
To change your system type:  
Press  
until display shows your furnace or boiler type.  
11  
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Run  
Program  
Press Time  
to move to next feature or  
to return to main display.  
Smart ResponseTechnology (Feature Number 13)  
Smart Response technology options are:  
0 = Smart Response technology on (preset).  
1 = Smart Response technology off.  
M13343  
To turn Smart Response technology on or off:  
Press  
once.  
Run  
Program  
Press Time  
to move to next feature or  
to return to main display.  
NOTE: See Smart Response technology (page 20) for information about this feature.  
Temperature Format (Feature Number 14)  
Temperature format options are:  
0 = °F (preset).  
1 = °C.  
M13344  
To change temperature format:  
Press  
once.  
Run  
Program  
Press Time  
to move to next feature or  
to return to main display.  
Time Format (Feature Number 16)  
Time format options are:  
0 = 12-hour clock (preset).  
1 = 24-hour clock.  
M13345  
To change time format:  
Press  
Press  
once.  
Run  
Program  
to return to main display.  
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Factory Set Function (Feature Number 37)  
Do not change this setting.  
M13346  
STEP 8. SET THE CLOCK  
Set Current Day and Time  
NOTE: On initial power-up, the screen flashes 1:00 pm until you press a key.  
Set Current  
Day/Time  
Press  
Press  
.
Day  
until screen shows current day.  
or until screen shows current time. (Tapping the  
Set Current  
Day/Time  
Press Time  
will advance the time in one  
hour increments).  
Daylight  
Time  
Press  
Press  
until DSTdisplays if daylight savings time is in effect.  
Run  
Program  
.
STEP 9. PROGRAMMING  
The keyboard is located behind the thermostat cover. The three most frequently used keys are near the display.  
Pressing displays the current temperature settings. Pressing the and keys change the temperature. The  
thermostat displays day, time, program period, temperature, system and fan settings.  
There is an individual key for each of the four program periods:  
Wake  
The program period when you want the house at a comfortable temperature when you get up and while you  
get ready for work or school. (This is a higher temperature during the heating season and a lower  
temperature during the cooling season).  
Leave  
The program period you can set for an energy-saving temperature while you are away at work or school.  
(This is a lower temperature during the heating season and a higher temperature during the cooling  
season).  
13  
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Return  
Sleep  
The program period when you want the house at a comfortable temperature for activities before bedtime.  
(This is a higher temperature during the heating season and a lower temperature during the cooling  
season).  
The program period you can set for an energy-saving temperature while you sleeping. (This is a lower  
temperature during the heating season and a higher temperature during the cooling season).  
Table 3 can be helpful when planning your schedule of time and temperature settings. The thermostat default settings  
are shown in parentheses ( ).  
Table 3. Personal Programming Table.  
Monday  
(Mon)  
Tuesday Wednesday Thursday Friday  
(Tue) (Wed) (Thu) (Fri)  
Saturday Sunday  
(Sat) (Sun)  
Period  
Default Setting  
Wake  
Time (6:00AM)  
Heata (70°F/21°C)  
Coolb (78°F/25.5°C)  
Leave  
Return  
Sleep  
Time (8:00AM)  
Heata (62°F/16.5°C)  
Coolb (85°F/29.5°C)  
Time (6:00PM)  
Heata (70°F/21°C)  
Coolb (78°F/25.5°C)  
Time (10:00PM)  
Heata (62°F/16.5°C)  
Coolb (82°F/28°C)  
a
b
Your heating setpoints cannot be higher than 90°F (32°C) or lower than 40°F (4.5°C).  
Your cooling setpoints cannot be higher than 99°F (37°C) or lower than 45°F (7°C).  
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14  
 
Program the First Day  
Start by programming the wake time and temperature for one day.  
Wake  
Press and release  
.
Day  
Press  
until the desired day displays. (Mon, Tue, Wed, Thu, Fri, Sat, Sun)  
or until the desired time shows in the display.  
Press time  
NOTE: Program times are in 15 minute intervals. For example, 8:00, 8:15, 8:30.  
Press or until the desired wake temperature displays.  
The setpoint temperature range is 40°F to 90°F (4.5°C to 32°C) for heating and 45°F to 99°F (7°C to 37°C) for cooling.  
Heat/Cool  
Settings  
Press  
to switch between setpoints.  
NOTE: Program times are the same for heating and cooling.  
Press or until the display shows the desired temperature setpoint.  
NOTE: You can program the fan to On or Auto for each program period. Setting Fan to On runs the system fan  
continuously in the program periods.  
Fan  
Press  
Press  
until the fan is at the desired setting (On or Auto).  
or and repeat these steps for each program period. The first day is now programmed.  
Leave  
Sleep  
Return  
,
Repeat each step in Program the First Day for the rest of the week.  
NOTE: After the first day is programmed, you can copy that day to any other day using procedure in Copy a Day.  
Run  
Program  
Press  
when the entire week is programmed.  
15  
 
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Copy a Day  
Your thermostat can copy program settings from one day to another.  
Wake  
Leave  
Return  
Sleep  
Press  
Press  
Press  
,
,
or  
to enter programming mode.  
Day  
until the display shows the day you want to copy.  
Copy  
. The display shows.  
Mon  
M13327  
M13328  
M13329  
Day  
Press  
Press  
until the display shows the day you want to copy to.  
to accept the change.  
Mon  
Wed  
Copy  
Repeat these steps for each day you want to copy.  
NOTE: donE appears for two seconds and then the normal program display appears.  
Clear a Program Period  
NOTE: Wake cannot be cleared.  
Leave  
Sleep  
Return  
Press  
Press  
,
, or  
for the program period you want to clear.  
Day  
until the desired day displays.  
Leave  
Sleep  
Return  
Press and hold the  
,
, or  
for approximately 3 seconds until the time and temperature clear.  
Repeat the above steps for each period to be cleared.  
Run  
Program  
Press  
.
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STEP 10. OPERATING YOUR THERMOSTAT  
Change Temperature Setting Until the Next Program Period (Temporary Change)  
Press  
or  
until the screen shows the desired temperature setting.  
NOTE: The temporary temperature setting is displayed for about 3 seconds and then the room temperature is dis-  
played. Temporary appears in the display. The setting cancels when the next program period starts or when  
Run  
Program  
you press  
.
Change Temperature Setting Indefinitely (Hold)  
System  
Press  
until Heator Coolis displayed.  
Hold Temp  
Press  
then or to change your setting if desired. (The display changes from showing the setpoint  
temperature to room temperature after approximately three seconds).  
Run  
Program  
To cancel Holdpress  
.
Change the Temperature Setting Until a Designated Day and Period (Vacation Hold)  
Hold Temp  
Press  
Press  
twice.  
until the display shows the desired temperature setpoint.  
until the desired number of days that you will be away (1 through 255) is displayed.  
or  
Press Time  
Leave  
Sleep  
Return  
Wake  
Press  
,
,
or  
to select the program period when you want the program to restart.  
Run  
Program  
NOTE: If the Vacation Hold needs to be cancelled before the designated time, press  
program.  
to return to the  
Daylight Savings Time Key  
This feature allows you to switch between standard time and daylight savings time.  
Daylight  
Time  
Press  
during fall to set the time back one hour.  
17  
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Daylight  
Time  
Press  
during the spring to set time forward one hour. DST is displayed when operating on daylight savings  
time.  
NOTE: Pressing the Daylight Time key more than once in a five minute period scrolls you through various time  
option. For example, one hour earlier or later, with or without DST. Pressing Daylight Time six times in a five  
minute period returns you to your original setting.  
STEP 11. SET THE FAN AND SYSTEM KEY  
Set the Fan Key  
Fan On: The fan runs continuously. Use for improved air circulation or more efficient central air cleaning. (In a heat  
only system, the fan runs continuously only if the fan relay is connected to the G thermostat terminal).  
Fan  
Press  
until display shows On.  
Fan Auto: Normal setting for most homes. The equipment controls the fan operation.  
Fan  
Press  
until display shows Auto.  
NOTE: If you set the fan to On during normal operation, the fan reverts to the programmed fan setting when the  
next program period begins.  
Set the System Key  
Heat: The thermostat controls your heating system.  
System  
Press  
until display shows Heat.  
Off: Both the heating and air conditioning systems are off.  
System  
Press  
until the display shows Off.  
Cool: The thermostat controls your air conditioning system.  
System  
Press  
until the display shows Cool.  
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IF YOU HAVE A PROBLEM  
Table 4. Solution Guide.  
If...  
Then…  
Display does not appear.  
Make sure the batteries are installed correctly.  
Make sure the thermostat is mounted and latched on the wall plate.  
Mount and latch the thermostat on the wallplate if it is not.  
Temperature settings will not change  
(example; cannot set the heating higher  
or the cooling lower).  
Make sure the temperature setpoints are:  
40 to 90°F (4.5 to 32°C) for heating.  
45 to 99°F (7 to 37°C) for cooling.  
Heating does not come on.  
Make sure the heating setpoint is above the room temperature.  
Make sure the circuit breaker is not tripped, and reset it if necessary.  
Make sure the power switch at the equipment is in the On position, and  
set it to On if it is in the Off position.  
Wait five minutes for the system to respond.  
Set the system key to Heat.  
Cooling does not come on.  
Make sure the cooling setpoint is below the room temperature.  
Make sure the circuit breaker is not tripped, and reset it if necessary.  
Make sure the system switch at the air conditioner is in the On position,  
and set it to On if it is in the Off position.  
Wait five minutes for the system to respond.  
Set the system key to Cool.  
Wait five minutes after seeing the flame or snowflake and check the  
registers again. If no there is no hot or cool air coming from the registers,  
refer to Heating does not come on or Cooling does not come on. If all of this  
has been checked, contact your local heating and cooling contractor.  
System on indicator( = heat,  
cool) is lit, but no warm or cool air is  
coming from the registers.  
=
Display flashes during programming.  
The temperature setting limit has been reached. The heating setting range  
is 40°F to 90°F (4.5°C to 32°C). The cooling setting range is 45°F to 99°F  
(7°C to 37°C).  
Temperature change occurs at the  
wrong times.  
1. Check the program times for the period in question.  
2. Make sure the AM and PM settings are correct.  
3. Make sure the current time and day settings are correct.  
4. Reprogram any incorrect settings.  
NOTE: If your thermostat is set for Smart Response control, the start  
times occur before your programmed comfort periods.  
19  
 
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Toll-Free Customer Assistance  
Please read and follow the provided instructions for this thermostat. For additional information, go to  
hours are Monday through Friday, 7:00AM to 5:30PM Central Time.  
Before calling, please have the following information available:  
Thermostat model number. (Located on back of thermostat).  
Thermostat date code. (Located below model number).  
Type of heating/cooling system (for example, hot water, warm air, oil, or gas).  
Location and number of wires connected to the thermostat.  
SMART RESPONSETECHNOLOGY  
Your CT3650 is actually a small computer. The Smart Response technology calculates the correct time of day to turn  
on your heating or cooling system. Smart Response technology considers the following information.  
Air temperature.  
Wall temperature.  
The time of day when you want the comfort temperature established.  
System Operating  
in Comfort Mode  
When the thermostat activates Smart  
Response technology, the thermostat  
displays In Recovery, changes the  
setpoint, and turns on the system.  
AM  
Room  
68°F  
66°F  
Mon  
Wake  
System  
Heat  
Recovery  
Continues  
AM  
Room  
Your CT3650 thermostat learns from  
experience. Each day it checks how  
closely it hit the recovery target and then  
adjusts the next days recovery start  
time accordingly.  
It takes a few days after installation for  
the thermostat to adjust to the local  
weather, your lifestyle, the construction  
of your home, and your heating/cooling  
system.  
You can turn off Smart Response  
technology by selecting Conventional  
Recovery. See Step 7. Customize Your  
Thermostat.  
Mon  
Heat  
Sleep In Recovery  
System  
Heat  
Recovery  
Begins  
1
AM  
Room  
64°F  
62°F  
Mon  
Heat  
Sleep In Recovery  
System  
Heat  
System Operating in  
Energy Savings Mode  
AM  
Room  
Mon  
Sleep  
System  
Heat  
5:00  
5:30  
6:00  
6:30  
ENERGY  
SAVINGS  
PERIOD  
COMFORT  
PERIOD  
RECOVERY FROM ENERGY SAVINGS  
TIME  
THERMOSTAT USES THE SAME SCHEME TO RETURN TO LOWER COMFORT TEMPERATURE DURING  
THE COOLING SEASON.  
M18591  
1
IF In Recovery IS DISPLAYED, PRESS  
TO SEE THE COMFORT SETPOINT.  
69-12852  
20  
 
 
WIRING DIAGRAMS  
4-WIRE HEAT/COOL  
(JUMPER INTACT)  
2-WIRE HEAT-ONLY  
(JUMPER INTACT)  
THERMOSTAT  
THERMOSTAT  
B
B
RC  
O
W
Y
RC  
O
W
Y
R
G
R
G
HEATING  
COOLING  
CONTACTOR  
COIL  
FAN  
RELAY  
HEATING  
RELAY OR  
VALVE COIL  
RELAY OR  
1
VALVE COIL  
1
1
POWER SUPPLY. PROVIDE  
DISCONNECT MEANS AND  
OVERLOAD PROTECTION AS REQUIRED.  
1
POWER SUPPLY.  
PROVIDE DISCONNECT MEANS  
M10617  
AND OVERLOAD PROTECTION AS REQUIRED.  
M10616  
4-WIRE SINGLE-STAGE HEAT PUMP  
(JUMPER INTACT)  
3-WIRE HEAT ONLY WITH FAN  
(JUMPER INTACT)  
THERMOSTAT  
B
THERMOSTAT  
B
RC  
O
W
Y
RC  
O
W
Y
R
G
R
G
3
2
HEAT  
CHANGEOVER  
VALVE  
COMPRESSOR  
CONTACTOR  
HEATING  
FAN  
RELAY  
2
RELAY OR  
1
VALVE COIL  
COOL  
CHANGEOVER  
VALVE  
1
FAN  
RELAY  
1
POWER SUPPLY. PROVIDE  
DISCONNECT MEANS AND  
OVERLOAD PROTECTION AS REQUIRED.  
M10618  
POWER SUPPLY. PROVIDE DISCONNECT MEANS  
AND OVERLOAD PROTECTION AS REQUIRED.  
1
2
3
USE EITHER O OR B FOR HEAT PUMP CHANGEOVER.  
USING A JUMPER WIRE (NOT SUPPLIED) CONNECT W TO Y.  
M12739  
21  
 
69-12852  
 
5-WIRE HEAT/COOL  
(JUMPER REMOVED)  
5-WIRE HEAT/COOL WITH DAMPER  
(JUMPER INTACT)  
THERMOSTAT  
B
THERMOSTAT  
B
RC  
O
W
Y
RC  
O
W
Y
R
G
R
G
HEAT  
DAMPER  
HEATING  
RELAY OR  
VALVE COIL  
FAN  
RELAY  
HEAT  
RELAY  
COMPRESSOR  
CONTACTOR  
COOLING  
CONTACTOR  
COIL  
1
1
COOL  
DAMPER  
FAN  
RELAY  
1
1
POWER SUPPLY. PROVIDE  
DISCONNECT MEANS AND OVERLOAD  
M10619  
1
POWER SUPPLY. PROVIDE  
DISCONNECT MEANS AND  
OVERLOAD PROTECTION  
AS REQUIRED.  
PROTECTION AS REQUIRED.  
M18738  
Notice:  
This thermostat is a Class B digital apparatus that complies with Canadian Radio Interference Regulations,  
CRC c. 1374.  
69-12852  
22  
 
Limited One-Year Warranty  
Honeywell warrants this product, excluding battery, to be free from defects in the workmanship or materials, under  
normal use and service, for a period of one (1) year from the date of purchase by the consumer. If, at any time during  
the warranty period, the product is defective or malfunctions, Honeywell shall repair or replace it (at Honeywells  
option) within a reasonable period of time.  
If the product is defective,  
(i) return it, with a bill of sale or other dated proof of purchase, to the retailer from which you purchased it, or  
(ii) package it carefully, along with proof of purchase (including date of purchase) and a short description of the  
malfunction, and mail it, postage prepaid, to the following address:  
Honeywell Inc. USA  
Honeywell Canada:  
Dock 4 MN10-3860  
Honeywell Limited/Honeywell Limitée  
35 Dynamic Drive  
1885 Douglas Drive North  
Golden Valley, MN 55422-3992  
Scarborough, Ontario M1V 4Z9  
This warranty does not cover removal or reinstallation costs. This warranty shall not apply if it is shown by Honeywell  
that the defect or malfunction was caused by damage which occurred while the product was in the possession of a  
consumer.  
Honeywells sole responsibility shall be to repair or replace the product within the terms stated above. HONEYWELL  
SHALL NOT BE LIABLE FOR ANY LOSS OR DAMAGE OF ANY KIND, INCLUDING ANY INCIDENTAL OR  
CONSEQUENTIAL DAMAGES RESULTING, DIRECTLY OR INDIRECTLY FROM ANY BREACH OF ANY  
WARRANTY, EXPRESS OR IMPLIED, OR ANY OTHER FAILURE OF THIS PRODUCT. Some states do not allow the  
exclusion or limitation of incidental or consequential damages, so this limitation may not apply to you.  
THIS WARRANTY IS THE ONLY EXPRESS WARRANTY HONEYWELL MAKES ON THIS PRODUCT. THE  
DURATION OF ANY IMPLIED WARRANTIES, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND  
FITNESS FOR A PARTICULAR PURPOSE, IS HEREBY LIMITED TO THE ONE YEAR DURATION OF THIS  
WARRANTY. Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may  
not apply to you.  
This warranty gives you specific legal rights, and you may have other rights which vary from state to state.  
If you have any questions concerning this warranty, please write our Customer Relations Center, Honeywell Inc.,  
1885 Douglas Dr. N., Golden Valley, MN 55422-3992, or call 1-800-468-1502, Monday-Friday, 7:00 a.m. to 5:30 p.m.,  
Central time. In Canada, write Retail Products ON30 Honeywell Limited/Honeywell Limitée, 155 Gordon Baker Road,  
North York, Ontario M2H 3N7.  
23  
69-12852  
 
Home and Building Control Home and Building Control  
Honeywell  
1985 Douglas Drive North  
Golden Valley, MN 55422  
Honeywell Limited-Honeywell Limitée  
35 Dynamic Drive  
Scarborough, Ontario  
M1V 4Z9  
Printed in U.S.A. on recycled  
paper containing at least 10%  
post-consumer paper fibers.  
69-12852 J.H. Rev. 04-01  
 

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