Honeywell 36 User manual

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Seven Day
Programmable Heat and/or Cool
Low Voltage (20 to 30 Vac) Thermostat and Wallplate
Model CT3600
OWNER’S GUIDE
Honeywell/36
Programmable Thermostat
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69-0939-1

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Total Comfort Temperature Management with
Smart Response Control
Congratulations!You made a smart choice when you purchased your new Honeywell Thermo-
stat.It’s the smart thermostat that:
• Keeps you comfortable by automatically calculating exactly when the furnace or air condition-
ing should go on to have the house at the desired comfort temperature by the time you wake
up or return home.
• Saves the maximum amount of energy and money by remembering to automatically adjust
the temperature when you leave home or go to sleep.
• Provides the ultimate in comfort and convenience . It comes already programmed, so it’s your
choice—use the preprogrammed schedule or set your own.
We invite you to spend a few minutes reading this manual.You’ll find it answers many of the
questions that will arise as you become familiar and comfortable with your Honeywell thermostat,
the state of the art in home comfort controls.

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RECYCLING
THERMOSTAT
If this thermostat is replacing a control
that contains mercury in a sealed
tube, do not place your old control in
the trash. Contact your local waste
management authority for instructions
regarding recycling and the proper
disposal of this control, or of an old
control containing mercury in a sealed
tube.
If you have questions, call Honeywell
Inc. at 1-800-468-1502.
M10614
MERCURY
SWITCH
TYPICAL LOCATION OF A MERCURY
SWITCH IN A THERMOSTAT

4 69-0939—1
TABLE OF CONTENTS
Step 1. Prepare for Installation ................................................................. 5
Step 2. Remove Old Thermostat ............................................................... 6
Step 3. MountThermostat Wallplate ......................................................... 8
Step 4 Wire WallplateTerminals ............................................................... 9
Step 5. Install the Batteries ....................................................................... 13
Step 6. Set Fan Operation Switch ............................................................. 14
Step 7. Mount theThermostat ................................................................... 15
Step 8. CustomizingThermostat............................................................... 15
Step 9. Programming ................................................................................. 20
Step 10. OperatingYour Thermostat ......................................................... 24
Step 11. Setting the Fan and System Switches....................................... 27
Troubleshooting Guide .............................................................................. 28
Limited One-Year Warranty ....................................................................... 31

5 69-0939—1
STEP 1. PREPARE FOR INSTALLATION
❑Check the compatibility chart to make sure this thermostat is compatible with your system.If
not, return to retailer.For specialty thermostat information, call Honeywell Customer
Assistance, toll-free 1-800-468-1502.
Compatibility Chart.
▲▲
1
▲▲
1
▲▲
1
Not compatible with any 120/240 volt circuit.
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.
System Type
Compatible
with
CT3600
Gas—Standing Pilot Yes
Gas—Electronic Ignition Yes
Gas-Fired Boilers Yes
Gas—Millivolt No
Oil-Fired Boilers Yes
Oil-Fired Furnace Yes
Electric Furnace Yes
System Type
Compatible
with
CT3600
Electric Air Conditioning Yes
Baseboard Electric
(120/240 line volt)
No
Single Stage Heat Pump Yes
Multistage Heat
Pumps/Multistage
Equipment
No

6 69-0939—1
STEP 2. REMOVE OLD THERMOSTAT
❑Test to make certain that your heating and
cooling systems are working properly.If
either 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 system at the furnace, or
at 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 thermo-
stat. If it does not snap off when pulled
firmly from the bottom, check for a screw
used to lock on the cover.
❑Loosen screws holding thermostat to
subbase, wallplate or wall, and lift away.
❑Disconnect wires from old thermostat or
subbase. 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 wires around pencil to keep them
from falling back into the wall, as shown.
WIRES THROUGH
WALL OPENING
M5136

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Replacing a clock thermostat that has
C or C1 clock terminals?
If you are replacing a Honeywell
Chronotherm® ClockThermostat, you may
find one or two wires that go to the C or C1
clock terminals on the Chronotherm® wiring
wallplate.Do not allow them to touch, or you
can damage your 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.
Six or more wires?
If there are six or more wires (excluding clock
wires attached to terminals), you most likely
have a variation of a multistage heat pump or
other multistage system.The thermostat is
not compatible with such systems so return
the product to the place of purchase.If you
would like information about which program-
mable thermostats will work with your
system, call Honeywell Customer Assistance
Center at 1-800-468-1502.
Three thermostat wires?
If you have three wires for a heating only
system and can operate the fan using the fan
ON switch, this thermostat will work with your
system.However, some hot water (zoned)
heating systems have three thermostat wires.
The thermostat will work only if you install an
isolating relay on these systems. For details,
call Honeywell Customer Assistance Center
at 1-800-468-1502.

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STEP 3. MOUNT THERMOSTAT WALLPLATE
WIRES
THROUGH WALL
WALL
MOUNTING
HOLES
M15044
MOUNTING
SCREWS
WALL
ANCHORS
(2)
❑Position wallplate on wall. Level the
wallplate for appearance if desired.Use a
pencil to mark the two mounting holes that
best fit the application.
❑Remove wallplate from wall, and drill
3/16 inch holes in wall (if drywall) as
marked. For firmer material such as
plaster or wood, drill 7/32 inch holes.
Gently tap anchors (provided) into drilled
holes until flush with the wall.
❑Reposition wallplate over holes, pulling
wires through wiring opening.Loosely
insert two mounting screws into holes.
❑Level for appearance only; thermostat
functions properly even when not level.
Tighten mounting screws.

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STEP 4. WIRE WALLPLATE TERMINALS
NOTE: All wiring must comply with local
codes and ordinances. If unsure
about household wiring procedures,
call your local heating/air condition-
ing contractor.
Refer to the labels you placed on wires when
you removed your old thermostat.
❑Match the letter of your old thermostat
wire with the terminal of the correspond-
ing letter on your new thermostat.Refer to
illustrations on pages 10, 11, and 12.
Be sure to remove the factory-installed
jumper connecting terminals R and Rc when
wires are connected to both the R and Rc
terminals.
❑Loosen the terminal screws and slip each
wire beneath its matching terminal. Either
straight or wraparound wiring connections
are acceptable (see illustration).Tighten
terminals.
❑Plug the hole in the wall with insulation to
help prevent drafts from adversely
affecting thermostat operation.
M4826
FOR WRAPAROUND
INSERTION STRIP
7/16 IN. (11 MM).
FOR STRAIGHT
INSERTION STRIP
5/16 IN. (8 MM).

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M10617
THERMOSTAT
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
1
4-WIRE HEAT/COOL
(JUMPER INTACT)
HEATING
RELAY OR
VALVE COIL
COOLING
CONTACTOR
COIL
FAN
RELAY
B
R
RC OW Y
G
M10616
THERMOSTAT
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
1
HEATING
RELAY OR
VALVE COIL
B
R
RC OW Y
G
2-WIRE HEAT-ONLY
(JUMPER INTACT)

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M10618
THERMOSTAT
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
1
3-WIRE HEAT ONLY WITH FAN
(JUMPER INTACT)
HEATING
RELAY OR
VALVE COIL FAN
RELAY
B
R
RC OW Y
G
M12739
THERMOSTAT
4-WIRE SINGLE-STAGE HEAT PUMP
(JUMPER INTACT)
B
R
RC OW Y
G
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
USE EITHER O OR B FOR HEAT PUMP CHANGEOVER.
1
2
2
2
1
COMPRESSOR
CONTACTOR
COOL
CHANGEOVER
VALVE
HEAT
CHANGEOVER
VALVE
FAN
RELAY

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M10619
THERMOSTAT
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
11
5-WIRE HEAT/COOL
(JUMPER REMOVED)
HEATING
RELAY OR
VALVE COIL
COOLING
CONTACTOR
COIL
FAN
RELAY
B
R
RC OW Y
G
M10620
HEAT
RELAY COMPRESSOR
CONTACTOR
COOL
DAMPER
1POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
CAN BE USED FOR CHANGEOVER VALVE ON
SINGLE-STAGE HEAT PUMP SYSTEMS.
2
2
2
1
5-WIRE HEAT/COOL WITH DAMPER
(JUMPER INTACT)
B
R
RC OW Y
G
FAN
RELAY
HEAT
DAMPER

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STEP 5. INSTALL THE BATTERIES
IMPORTANT
Three AA alkaline batteries are
included with the thermostat.
Batteries must be installed for
programming and operation of the
thermostat and heating/cooling
system.
❑Install the batteries on the wallplate as
shown, making sure positive (+) terminals
all face upward.
As the batteries are running low, a REPL BAT
indicator will flash for 1 to 2 months before
batteries run out completely. Replace the
batteries as soon as possible after the
indicator starts flashing.
If you insert new batteries within 20 to 30
seconds of removing the old ones, you will
not have to reset the current time.However, if
the display is blank, the batteries are dead or
incorrectly installed. See page 22 to reset
current time and day.
M10622
INSTALL 3 AA ALKALINE BATTERIES
AS SHOWN, POSITIVE (+) TERMINALS
TOWARD TOP.
WALLPLATE
B
RRCOWYG

14 69-0939—1
IMPORTANT
Although the thermostat has a low
battery indicator, replace the
batteries once a year to prevent
leakage and to prevent the
thermostat and heating/cooling
system from shutting down due to
lack of battery power.
As a precaution when leaving home for
longer than a month, change batteries before
you leave to prevent system from shutting
down due to lack of battery power.
Use fresh alkaline batteries; nonalkaline
batteries do not last as long, and may leak,
causing damage to the thermostat or the wall
surface.We recommend Energizer®
batteries.
STEP 6. SET FAN
OPERATION SWITCH
The thermostat fan operation switch, labeled
FUEL SWITCH is factory set in the F position.
This is the correct setting for most systems. If
your system is an electric heat system, set
the switch to E.The E setting allows the fan
to turn on immediately with the heating or
cooling in a system where the G terminal is
connected.
M12676
FUEL SWITCH

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STEP 7. MOUNT THE
THERMOSTAT
M12703
B. PRESS LOWER EDGE OF CASE TO LATCH.
A. ENGAGE TABS AT TOP OF THERMOSTAT AND WALLPLATE.
STEP 8. CUSTOMIZING
YOUR THERMOSTAT
The thermostat can be customized to match
your heating/cooling system and your display
preferences.See pages 18 and 19 for
available options.The thermostat comes
factory set to the most common settings:
—°F temperature display,
— 12 hour clock format,
— Heating system on-time set for gas or oil
forced air system,
— Smart Response.

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M12672
INSTALLER SETUP NUMBER
DISPLAY (COLUMN 2) FACTORY SETTING OR OTHER
CHOICE DISPLAY (COLUMN 3 OR 5)
You can change any of these settings by
pressing and holding the Information key
and both and keys until the numbers
4 and 6 are displayed. All the display
segments will appear for about 3 seconds
before the numbers 4 and 6 appear.
• the time you want the comfort temperature
established.
The thermostat displays In Recovery,
changes the setpoint and turns on the system
whenever the thermostat activates the Smart
Response feature.
• This thermostat learns from experience.
Each day it checks how closely it hit the
recovery target and adjusts the next day
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 the Smart Response
feature in the installer setup section by
selecting Conventional Recovery.
Smart Response
The CT3600 Thermostat is actually a small
but powerful computer.The Smart Response
feature calculates the time to turn on your
heating or cooling system. It considers:
• air temperature
• wall temperature

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System Operating in
Energy Savings Mode
Recovery
Begins
Recovery
Continues
System Operating
in Comfort Mode
ENERGY
SAVINGS
PERIOD RECOVERY FROM ENERGY SAVINGS
5:305:00 6:00 6:30
COMFORT
PERIOD
TIME
THERMOSTAT USES THE SAME SCHEME TO RETURN TO LOWER COMFORT TEMPERATURE DURING
THE COOLING SEASON.
M12738
62°F
64°F
66°F
68°F
Heat
System
Mon In
Room
AM
Recovery
Night
Heat
System
Morning
Mon
Room
AM
Heat
Heat
System
Mon In
Room
AM
Recovery
Night
Heat
System
Mon
Room
AM
Night
Heat
IF In Recovery IS DISPLAYED, PRESS TO SEE THE COMFORT SETPOINT.
1
1
TEMPERATURE
Smart Response

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The following table shows the numbers that will be displayed and what your choices are.
Number
Displayed
(Press
Time▲key Factory-Setting Other Choices
(Press ▲or ▼key to change) Actual
Select to change) Display Description Display Description Setting
Heating
cycle ratea4 6 Gas or oil forced air heating system 1, 3 or 9 1—radiant floor heat or gravity steam
system
3—hot water system
or high efficiency
furnace
9—electric heat
system
Smart
Response
controlb
13 0 Smart Response
control is activated
(system starts early
so your house is at
your programmed
temperature at your
programmed time)
1 Conventional recovery
(system starts at your
programmed time)

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a Be sure to change the heating cycle rate to 3 when using a high efficiency furnace such as a
90% or greater AFUE (Average Fuel Utilization Efficiency) unit.
bRefer to Smart Response control section for more information.
IMPORTANT
Press to exit the customizing feature.The thermostat has saved your changes,
but you must set the current day and time for the thermostat to use the settings.Refer to
the Setting Current Day and Time portion of the Programming section for
instructions.
Run
Program
Number
Displayed
(Press
Time▲key Factory-Setting Other Choices (Press ▲or ▼key to change) Actual
Select to change) Display Description Display Description Setting
Tempera-
ture format 14 0 Temperature is displayed in °F1 Temperature is displayed in °C
Clock
format 16 0 Time is displayed in 12-hour format 1 Time is displayed in 24-hour (military time)
format
Factory
set
function
37 0 Do not change — — —

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STEP 9. PROGRAMMING
The keyboard is located behind the thermo-
stat cover with three frequently used keys by
the display. Pressing the Information key
will display the present settings and pressing
the and keys changes the tempera-
ture.The thermostat display shows day, time,
program period, temperature and system
operation selection.
There is an individual key for each of the four
time periods—
—the time period you want the house
at a comfortable temperature when you
get up and while you get ready for work
or school. (This will be a higher
temperature during the heating season
and a lower temperature during the
cooling season.)
—the time period you can set for an
energy-saving temperature while you
are away at work or school. (This will be
a lower temperature in the heating
season and a higher temperature
during the cooling season.)
—the time period you want the house at
a comfortable temperature for activities
before bedtime. (Again, higher heat and
lower cool.)
—the time period you can set for an
energy-saving temperature while you
are sleeping. (Again, lower heat and
higher cool. Some people choose not to
raise the cooling temperature for more
comfortable sleeping.)
The personal programming table on page 21
may be helpful when planning your schedule
of time and temperature settings.The
thermostat default settings are in the
parenthesis ( ).
Morning
Daytime
Evening
Night