Honeywell Ct8611 Users Manual 69 0816 PROGRAMMABLE HEAT PUMP THERMOSTAT

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2015-01-23

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1 69-0816

INSTALLATION MANUAL

IMPORTANT:

This thermostat may be programmed either

before or after installation. Refer to Owner’s Guide,

form 69-0398, for programming instructions.

CT8611

PROGRAMMABLE

HEAT PUMP THERMOSTAT

12-93 • Form Number 69-0816

Toll-free Customer Assistance

For all questions concerning this thermostat, please read and follow the instructions. If additional

assistance is needed, call Honeywell Customer Assistance toll-free at 1-800-468-1502, Monday-Friday,

7:00 a.m.-5:30 p.m. Central Time.

Before you call, please have the following information available—thermostat model number and date

code, kind of heating/cooling system (i.e., hot water, warm air, oil, gas, etc.), number of wires connected to

the thermostat.

NOTICE

This equipment is a Class B digital apparatus, which complies with Canadian Radio Interference

Regulations, CRC c. 1374.

3 69-0816

Your new thermostat provides energy saving

control for a 24 Vac multistage heat pump heating/

cooling system direct from the control transformer.

The CT8611 includes SYSTEM and ENRG SAV

LEDs located near the top of the thermostat face.

The SYSTEM LED lights when the thermostat is

signaling for heating or cooling. The ENRG SAV

LED lights during the LEAVE and SLEEP periods.

The CT8611 also includes AUX. HT. and EM.

HT. LEDs near the bottom center of the subbase.

The AUX. HT. LED lights whenever the thermostat

is calling for operation of the backup or auxiliary

heater. Backup (auxiliary) heat is more expensive

to operate than the heat pump and typically is used

only when the heat pump is unable to handle the

heating load. The EM. HT. LED lights whenever the

thermostat system switch is in the EM. HT. position.

Heat and cool anticipation is fixed in all models;

no adjustment is necessary. Cycle rates are adjust-

able for auxiliary heating stage.

Any questions concerning your system’s com-

patibility with your thermostat may be directed to

Honeywell Customer Assistance at their toll-free

number, 1-800-468-1502.

WARNING

This device is designed to operate on low

voltage (20 to 30 Vac). The application of

higher voltage is dangerous and may cause

electrical shock, fire or personal injury.

WHEN INSTALLING THIS PRODUCT…

1. Read these instructions carefully. Failure to

follow them could damage the product or cause a

hazardous condition.

2. Check the CT8611 Heat Pump Thermostat

Wiring Guide, form 69-0817, to make sure the prod-

uct is suitable for your application.

3. Allow thermostat to warm to room tempera-

ture before operating.

4. After installation is complete, check thermo-

stat operation as provided in these instructions.

1PREPARATION

TOOLS REQUIRED FOR INSTALLATION

Assemble a flat blade screwdriver and other

tools as needed (right).

Test to make certain that your heating and

cooling systems are working properly. If either

does not work, contact your local heating/air condi-

tioning dealer. To avoid compressor damage, do

not operate the cooling system if outdoor tempera-

ture is below 50° F [10° C].

TURN OFF POWER to the system at the heat

pump and at the fuse/circuit breaker panel.

Carefully unpack your new thermostat. Save

instructions, proof of purchase from packag-

ing and original receipt.

FLAT BLADE

SCREWDRIVER HAND OR POWER

DRILL WITH 3/16 INCH

DRILL BIT, IF NEEDED TO

DRILL HOLES IN WALL

WIRE CUTTER/STRIPPER OR SHARP

KNIFE, IF NEEDED TO STRIP WIRES

MASKING TAPE, IF NEEDED

TO LABEL WIRES AS THEY

ARE DISCONNECTED FROM

OLD THERMOSTAT

SPIRIT LEVEL, IF NEEDED TO LEVEL

THERMOSTAT FOR APPEARANCE M849

5 69-0816

2REMOVE OLD THERMOSTAT

Disconnect wires from old thermostat or sub

base. Always label all wires as you disconnect

them from your old thermostat. Use the CT8611 Wire

Tags provided to label each wire with the appropriate

terminal designation as you remove it. It is important

to note the terminal designation when removing wires.

Not all thermostats are wired by color code.

Keep the wires from falling back into the wall

by wrapping them around a pencil, as shown.

WIRES THROUGH

WALL OPENING

M5136

WARNING

If your old thermostat is attached to a

junction box in the wall, it is likely that

120V are present. To prevent electrical

shock hazard,

do not proceed

. Call a quali-

fied electrician.

CAUTION

1. Disconnect power supply to prevent

electrical shock or equipment damage.

2. After wiring is complete, push excess

wire back into the hole, and plug hole

with nonhardening caulk, putty, or insu-

lation to prevent drafts from affecting

thermostat operation.

Remove cover from old thermostat. If it doesn’t

snap off when pulled firmly from the bottom,

check for a screw that locks the cover.

Loosen screws holding thermostat to subbase,

wallplate or wall, and lift away.

Do not discard your old thermostat until you

have thoroughly checked out system opera-

tion with your new Honeywell CT8611 Heat Pump

Thermostat installed. If your old thermostat con-

tains mercury, do not dispose of it in the trash, see

below.

RECYCLING THERMOSTAT

If this thermostat is replacing a

thermostat that contains mercury in

a sealed tube, do

not

place your old

thermostat in the trash. Contact your

local waste management authority

for instructions regarding recycling

and the proper disposal of your old

thermostat.

If you have questions, call Honeywell Inc. at

1-800-468-1502.

M3376

MERCURY

SWITCH

ANTICIPATOR

SCALE

ANTICIPATOR

SETTING LEVER

COILED

BIMETAL

Typical location of a mercury switch

in a thermostat.

7 69-0816

The subbase does not require leveling for

proper operation; level it for appearance only.

Remove thermostat from subbase (Fig. 1).

Mount the subbase directly onto the wall with

the screws included in the package. Use the

subbase as a template, and with a pencil, mark the

two mounting screw positions (Fig. 2). Use 3/16 in.

bit to drill holes for anchors. Gently tap anchors into

holes until they are flush with the wall surface.

MOUNT THERMOSTAT SUBBASE

3Thread wires through the center opening of

the subbase. Then, mount the subbase using

the two screws provided. Gently tighten the screws,

level the top surface of the subbase and then se-

curely tighten the screws.

WIRES THROUGH

WALL OPENING

WALL

ANCHORS

(2)

SUBBASE

MOUNTING

HOLES

MOUNTING

SCREWS (2)

M5175

Fig. 1—Removing thermostat from base. Fig. 2—Mounting subbase on wall.

AUX. HEAT

ONAUTO

FAN

M9073

. HT HEAT OFF COOL

4WIRE THERMOSTAT TERMINALS

NOTE: All wiring must comply with local codes and

ordinances. If unsure about household wiring

procedures, call Honeywell Customer Assistance

with your questions Monday-Friday, 7:00 a.m.-

5:30 p.m., Central time, 1-800-468-1502.

Refer to the CT8611 Heat Pump Thermostat

Wiring Guide, form 69-0817, and to the wire

labels you applied when you removed the old

thermostat. Match the letter from your old ther-

mostat wire with the appropriate letter on your

new thermostat. Follow any special instructions

provided in the Wiring Guide. Wire only those

terminals shown with lines connecting them.

Some terminals on the thermostat may not be

used.

For each wire, loosen the terminal screw, slip

the wire beneath its matching terminal, and

tighten the screw.

The shape of the terminal barrier allows straight

or conventional wraparound wiring connections.

NOTE: Keep all wiring restricted to ribbed area

surrounding terminals (Fig. 3) to assure thermo-

stat/subbase contact.

FOR STRAIGHT

INSERTION –

STRIP 5/16 in. [8 mm]

FOR WRAPAROUND –

STRIP 7/16 in. [11 mm]

RESTRICT

WIRING TO

THIS AREA

WIRING TO BE BELOW

THIS SURFACE

TOP SURFACE

OF SUBBASE

FRONT VIEW OF

TERMINAL AREA

CROSS-SECTIONAL VIEW OF

TERMINAL AREA

M3062

Fig. 3—Keep wiring restricted to ribbed area

surrounding terminals.

9 69-0816

Figs. 4 and 5 illustrate typical hookups for the

CT8611 heat pump thermostat.

M9077

POWER SUPPLY. PROVIDE DISCONNECT MEANS

AND OVERLOAD PROTECTION AS REQUIRED.

DEFROST

CONTROL C/O RELAY

HEAT

C/O RELAY

COOL

AUX. HT.

RELAY

FAN

EM. HT.

RELAY

MONITOR

RCO

(HOT)

CT8611R

COMPRESSOR

CONTACTOR

M9076

POWER SUPPLY. PROVIDE DISCONNECT MEANS

AND OVERLOAD PROTECTION AS REQUIRED.

DEFROST

CONTROL

C/O RELAY

HEAT

C/O RELAY

COOL

AUX. HT.

RELAY

FAN

EM. HT.

RELAY

MONITOR

1ST STAGE

COOL RELAY

RCO

(HOT)

CT8611R

1ST STAGE

HEAT RELAY

Fig. 5—Typical hook up of CT8611 with

jumper removed.

Fig. 4—Typical hook up of CT8611 with

jumper intact.

5COMPLETE INSTALLATION

ADJUST CYCLE RATE

1st stage heating and 1st stage cooling cycle

rates are factory-set for heat pumps. The heat

pump compressor cycle rate cannot be adjusted.

To customize the thermostat’s performance to

different types of heating equipment, however, a

cycle rate adjustment screw is provided on the back

of the thermostat to control the auxiliary heat cycle

rate. Correct setting of the screw will provide opti-

mum savings, See Fig. 6.

NOTE: MOST APPLICATIONS DO NOT REQUIRE

A CHANGE IN CYCLE RATE.

The room air temperature normally varies

slightly from the comfort temperature setting with

the cycling of the heat pump or auxiliary heater.

INSTALL BATTERIES

Three AAA alkaline batteries are included with

the thermostat to prevent program loss in case of

power outage. Install batteries in back of thermo-

stat as shown in Fig. 7. Without battery backup, the

Fig. 6—Cycle rate adjustment.

BATTERY PLACEMENT

(NOTE CORRECT PLUS

AND MINUS DIRECTION)

M3058

Fig. 7—Battery placement.

M9075

1A 1B

3 CPH

6 CPH

OUT 1/2

TURN

NOT USED

CYCLE RATE

AUXILIARY HEAT

SLOWER

CYCLING

FASTER

CYCLING

11 69-0816

program will remain for only about 20 seconds in

the event of power loss.

When batteries are first installed, the display

will flash 1:00 PM and 32°. When the batteries are

low, the display will flash REPL BAT. You have 20-

30 seconds to replace batteries after removing them

from the thermostat. After 20-30 seconds, you will

have to reprogram. REPL BAT indication will disap-

pear when the thermostat is mounted back onto the

powered subbase.

If batteries are completely dead, the display

will go blank when the thermostat is removed from

the subbase. After replacing the battery in this

case, reprogramming is necessary.

MOUNT THE THERMOSTAT

With system switch set to OFF, hang the ther-

mostat on the tabs at the top of the subbase

(Fig. 8A). Swing down and press on lower edge

until thermostat snaps in place (Fig. 8B). Open

cover and tighten the captive mounting screws

(Fig. 8C).

Fig. 8—Mounting the thermostat on subbase.

M9074

MORNIMG

MON HEAT ON

ROOM

AUTO

MORNIMG

MON HEAT ON

ROOM

SYSTEMENRG. SAVE

RUN

PROGRAM

TIME

PERIOD

TEMPERATURE

PRESENT

SETTING

SKIP

PERIOD

CHANGE

TO LAST

PERIOD

SET

PRESENT

DAY/TIME

HOLD

TEMP

DAY

SET

HEAT/COOLSLEEP

LEAVEAHEADWARMER

RETURNBACKCOOLER

WAKE

A. B.

EM. HEAT AUX. HEAT

EM. HT HEAT OFF COOL

ONAUTO

FAN

SYSTEMENRG. SAVE

If the display will not come on:

—check the mounting of the thermostat to the

subbase. If loose or misaligned, remove thermo-

stat and reinstall on the subbase, making sure it

is firmly attached.

— check to see that system power is on.

— check voltage between R and C; it should be 20

to 30 Vac.

SET DAY AND TIME

Restore 24V power to the thermostat. When

power is applied, the display will read 1:00 PM and

indicate the room temperature. It will go off for a few

seconds, then begin to flash on and off. Set the

present day and time.

Press

SET

PRESENT

DAY/TIME

Press

DAY

to set the current day. Each press of the

DAY key advances the display one day.

Press TIME

AHEAD

BACK

to set the current time.

13 69-0816

CAUTION

•Do not check the heating system op-

eration by jumpering thermostat termi-

nals at the primary control. This will

damage the thermostat.

•To avoid possible compressor damage,

do not operate the cooling system if the

outside temperature is below 50° F

[10° C]. See compressor manufacturer’s

instructions for further information.

•During cold weather, some heat pumps

will require that the crankcase heater

be energized several hours before op-

erating the heat pump. Refer to the

manufacturer’s recommendations.

Restore the power to the system.

CHECK HEATING OPERATION

Move the system switch to HEAT and the fan

switch to AUTO. Press WARMER key until the set-

ting is about 10° F [6° C] above room temperature.

CHECK THERMOSTAT OPERATION

Heating should start and the fan should run (there

may be a delay of 5-10 minutes before heat turns

on). Press COOLER key until the setting is about

10° F [6° C] below room temperature. The heating

equipment and fan should shut off.

During checkout, the backup heat will come

on immediately. During normal operation, the backup

heat will come on after a delay.

Backup (auxiliary) heat is more expensive to

operate than the heat pump and typically is used only

when the heat pump is unable to handle the load.

CHECK EMERGENCY HEATING

OPERATION

Move the system switch to EM. HEAT and the

fan switch to AUTO. Press WARMER key until the

setting is about 10° F [6° C] above room tempera-

ture. Heating should start and the fan should run.

CHECK COOLING OPERATION

Move the system switch to COOL and the fan

switch to AUTO. Press COOLER key until the set-

ting is about 10° F [6° C] below room temperature.

Cooling should start and the fan should run. Press

WARMER key until the setting is about 10° F [6° C]

above room temperature. The cooling equipment

and fan should shut off.

on your furnace or air conditioner, it considers (1) air

temperature, (2) the temperature of the wall and (3)

when you want the comfort temperature established.

During Adaptive Intelligent Recovery

TM the ther-

mostat increases the control temperature gradually

and turns the equipment on and off several times to

save energy by avoiding “overshooting” the comfort

temperature. See the current control temperature

anytime during recovery by pressing the PRESENT

SETTING key. On some models, both the SYSTEM

and ENERGY SAVING lights may be lit at the same

time during recovery.

This “smart” control learns from experience

. Each

day it checks how closely it “hit the target” and

adjusts the recovery start time accordingly.

It typically takes four to eight days after installa-

tion for this thermostat to adjust to the weather, life

style, home construction and heating/cooling sys-

tem. The thermostat calculates the LEAVE/RETURN

recovery separately from the SLEEP/WAKE recovery.

ABOUT ADAPTIVE INTELLIGENT

RECOVERYTM

•

People perceive temperature

from a variety of

sources, not only from the air in the room, but

also from their surroundings—walls, windows

and furnishings.

•

Human beings feel differences

in temperature

as slight as two degrees Fahrenheit.

•

Common household thermometers

and standard

thermostats

sense only air temperature, which

may or may not reflect how hot or cold the room

actually

feels

to a human being.

•This thermostat reads the temperature of the

wall as well as the air—and responds to tem-

perature changes as little as one degree Fahr-

enheit—so room temperature is more likely to

“feel right.”

THE OPTIMUM COMFORT AND ENERGY

SAVINGS SOLUTION

This thermostat is actually a small but powerful

computer

. When calculating the exact time to turn

SUN MON TUE WED THU FRI SAT COOL ON HEAT ON

WAKE LEAVE RETURN SLEEP TEMPORARY UNOCCUIPIED

REPL

BAT

SET

SUN MON TUE WED THU FRI SAT COOL ON HEAT ON

WAKE LEAVE RETURN SLEEP TEMPORARY UNOCCUIPIED

REPL

BAT

SET

SUN MON TUE WED THU FRI SAT COOL ON HEAT ON

WAKE LEAVE RETURN SLEEP TEMPORARY UNOCCUIPIED

REPL

BAT

SET

SUN MON TUE WED THU FRI SAT COOL ON HEAT ON

WAKE LEAVE RETURN SLEEP TEMPORARY UNOCCUIPIED

REPL

BAT

SET

System Operating

in Energy Savings Mode

Recovery Begins Recovery Continues

System Operating

in Comfort Mode

ENERGY

SAVINGS

PERIOD

RECOVERY FROM ENERGY SAVINGS COMFORT

PERIOD

TIME

TEMPERATURE

THE THERMOSTAT USES THE SAME SCHEME TO RETURN GRADUALLY

TO LOWER COMFORT TEMPERATURE DURING THE COOLING SEASON. M171

15 69-0816

IF ADDITIONAL ASSISTANCE IS NEEDED, PLEASE CONTACT HONEYWELL CUSTOMER ASSIS-

TANCE AT 1-800-468-1502, MONDAY-FRIDAY, 7:00 AM-5:30 PM, CENTRAL TIME. BEFORE YOU

CALL, PLEASE HAVE THE FOLLOWING INFORMATION AVAILABLE: TYPE OF HEATING SYSTEM,

IGNITION TYPE, WHETHER GAS OR ELECTRIC AIR CONDITIONING, MODEL NUMBER OF OLD

THERMOSTAT, NUMBER OF WIRES, AND TERMINAL DESIGNATIONS USED.

Home and Building Control Home and Building Control

Helping You Control Your World

Honeywell Inc. Honeywell Limited—Honeywell Limitée

1985 Douglas Drive North 740 Ellesmere Road

Golden Valley, Minnesota 55422 Scarborough, Ontario

M1P 2V9

Honeywell Ct8611 Users Manual 69 0816 PROGRAMMABLE HEAT PUMP THERMOSTAT

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