Honeywell T7512B Thermostat User Manual

Welcome to the world of comfort and energy

savings with your new Honeywell Energy

Management Thermostat.

advantage of special programs you can sub-

scribe to that can further increase your energy

savings.

This thermostat allows full weekday/weekend

programming so you can set the thermostat to

control the temperature in your home according

to your personal schedule and preferences.

When programmed according to the instructions

in this guide, the features available with this

thermostat will not only keep you comfortable,

but will also save you energy.

These special programs can include one or both

of the following:

Time-of-Use Pricing. If your utility offers

Time-of-Use Pricing rates, this thermostat

will communicate with the utility to inform

you of the rate in effect at any given time.

The rate that is in effect is indicated on the

thermostat display as shown in Fig. 1. A

special feature of this thermostat allows

you to set an offset temperature that

automatically adjusts your energy use for

each rate. This typically involves control-

In addition to being programmable, this thermo-

stat also contains a communications module.

This module allows your utility company to

communicate with your thermostat to take

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ling your home at a higher temperature

during the cooling season and a lower

temperature during the heating season.

under DLC, the word SAVING is displayed

on the thermostat. See Fig. 2.

You must subscribe to these programs

before your utility company can communi-

cate with your thermostat. If you have any

questions concerning the application of this

thermostat or these special programs and

features, please contact your local utility.

COOL

AUTO

TUE

M7904

INDICATOR FOR TIME-OF USE PRICING

Fig. 1.Time-of-use pricing indicator.

COOL

AUTO

Direct Load Control. If your utility offers

Direct Load Control (DLC), this thermostat

can be controlled by your utility to limit

your cooling and heating use during peak

demand times. When your thermostat is

TUE

SAVING

M7903

SAVINGS INDICATOR

Fig. 2. Savings indicator.

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Table Of Contents

Recovery From Setback ................................................................................................................

Programming Your Thermostat......................................................................................................

Personal Programming Charts ......................................................................................................

Step 1—Set the Current Time/Day ...................................................................................... 10

Step 2—Enter the Program Schedules ............................................................................... 10

Step 3—Set the System and Fan Controls.......................................................................... 12

Step 4—Start the Thermostat Program ............................................................................... 14

Operating Your Thermostat ........................................................................................................... 14

Thermostat Operation When Special Programs are in Effect ....................................................... 18

Replacing the Thermostat Batteries .............................................................................................. 20

Troubleshooting Guide .................................................................................................................. 22

Toll-Free Customer Assistance ..................................................................................................... 27

Warranty Conditions...................................................................................................................... 28

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RECOVERY FROM SETBACK

The term recovery refers to the process the

thermostat uses to operate the heating or

cooling equipment to return the house from the

energy savings setting you selected for when

you are away or asleep to the temperature you

prefer when you are home and awake.

want the temperature in the house to be 72°F at

6:00 AM, you should program the thermostat to

an earlier time; for example, 5:30. (The exact

amount of time it takes your home to warm or

cool to the temperature you want depends on

many factors such as the size of your heating/

cooling equipment and the outdoor tempera-

ture.)

This thermostat uses a recovery process that

turns your heating/cooling equipment on or off at

the time you program the temperature to

If this thermostat is for a heat pump system, the

thermostat uses an algorithm when recovering

from setback that helps reduce the use of

auxiliary heat.

change. For example, if you program the

thermostat’s heating program to 72°F at 6:00

AM, the heating equipment will come on at 6:00

AM and begin warming the house to 72°F. If you

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PROGRAMMING

YOUR THERMOSTAT

IMPORTANT

WAKE, LEAVE, RETURN, and SLEEP on the

T7512A,B,C,D Thermostats. These periods can

be displayed individually on the thermostat as

you press the WEEKDAY SCHEDULE or

WEEKEND SCHEDULE keys. You may want to

enter a different schedule for the cooling and the

heating seasons.

Batteries must be installed to maintain

time and date in the event of power loss.

You will find it helpful to complete the Personal

Programming Charts on the following pages

before you begin programming the thermostat.

Plan your program schedule of time and

WAKE is the time you get up. Generally you

want the house at a comfortable tempera-

ture when you wake up and get ready to

go to work or school. Set the WAKE time

earlier than your alarm clock so the house

temperature settings for various times of the day

by filling in the boxes in the Personal Program-

ming Charts. There are four time periods

available for weekdays, Saturday, and Sunday—

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has time to warm up or cool down before

you get up.

SLEEP is the time you usually go to sleep.

While you are sleeping, you can save

energy by setting the thermostat to control

the temperature higher or lower (depend-

ing on the season). For more comfortable

sleeping, some people choose not to raise

the cooling temperature at night.

LEAVE is the time you leave for work or

school. Generally, once you leave the

house, you want the temperature higher or

lower (depending on the season) so that

you can save energy while you are away.

RETURN is the time you return from work or

school. Once again, you want the house at

a comfortable temperature when you

return and go about the normal activities

of your day before bedtime. Set the

RETURN time earlier than the time you

actually get home so the house has time

to warm up or cool down before you get

there.

If you decide not to program the thermostat, it

automatically controls heating and cooling

temperatures as follows:

Starting at 6:00 AM every day, the thermostat

sets the heating temperature to 68° and the

cooling temperature to 76°F.

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At 10:00 PM every night, the thermostat sets the

heating temperature back to 60°F; the cooling

temperature remains at 76°F.

Personal Programming Charts

Cooling Schedule (for Summer Use):

Time

Cooling

Schedule

Weekday

Period

WAKE

Time

Temperature

You do not need to enter a time and temperature

program for every period if your schedule does

not require it. For example, if your house is

occupied during the day on weekdays, you can

program only the WAKE and SLEEP times.

LEAVE

RETURN

SLEEP

WAKE

LEAVE

RETURN

SLEEP

WAKE

Saturday

Sunday

NOTE: Temperatures cannot be set any higher

than 88°F or any lower than 45°F.

LEAVE

RETURN

SLEEP

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Heating Schedule (for Winter Use):

If you subscribe to Time-of-Use Pricing, use the

following table to plan the offset values you will

enter for each Time-of-Use Pricing rate, use a

numerical value as described in Enter Offset

Values. You should enter a different offset value

for the heating and cooling seasons, see chart.

You do not need to enter an offset for rate 1.

Time

Heating

Schedule

Period

Time

Temperature

Weekday

WAKE

LEAVE

RETURN

SLEEP

WAKE

LEAVE

RETURN

SLEEP

WAKE

Saturday

Sunday

Offsets for

Cooling Season (+)

Heating Season (-)

Rate 2 Rate 3 Rate 4 Rate 2 Rate 3 Rate 4

LEAVE

RETURN

SLEEP

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Before programming the thermostat, remove the

clear plastic overlay that covers the display.

When pressing the keys, use the ball of your

finger or a soft pencil eraser; using sharp

fingernails or pencil points can damage the

keypad. If you make a mistake during program-

ming, press the Run Program key and repro-

gram the time, temperature, or offset value with

the error.

current day is displayed. After you have set the

time and day, press the Run Program key.

Step 2—Enter the Program Schedules

Entering a Heating Schedule

Refer to your Personal Programming Charts and

proceed as follows:

Press the System key until the thermostat

displays the word HEAT to indicate you

are in the heating mode. Press and

release the Weekday Schedule key once.

The words WAKE, MON...FRI and SET

appear on the display.

Press the Ahead or Back keys to set the

weekday WAKE time from your Personal

Programming Charts. Press the Warmer

Step 1—Set the Current Time/Day

To set the time, press and release the Set

Clock/Day key once. Press Ahead or Back

keys until the current time is displayed. To set

the day, press and release the Set Clock/Day

key again. Press Ahead or Back keys until the

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or Cooler keys to set the weekday WAKE

temperature from your Personal Program-

ming Charts.

Enter Offset Values

Enter the offset value for each Time-of-Use

Pricing rate using the Offset key. You can enter

offset numbers only if you are a subscriber to

Time-of-Use Pricing.

Repeat the above sequence for the other

weekday schedules: LEAVE, RETURN, and

SLEEP.

The offset value you enter is the number of

degrees you are willing to allow the heating or

cooling temperature you have already pro-

grammed for normal operation to change so you

can save money at each rate. For example, if

you normally want your home heated to 72°

when rate 1 is in effect, but are willing to let your

home cool to 70° when rate 2 is in effect, your

heating offset value for rate 2 is -2 (72° -2° =

70°). If you do not enter an offset, the offset is 0°.

The first time you press the Offset key, the offset

Press the Weekend Schedule key until SAT,

WAKE and SET appear on the display. Set

the WAKE, LEAVE, RETURN and SLEEP

schedules for Saturday just as you did for

the weekdays.

Press the Weekend Schedule key again so

that SUN, WAKE and SET appear on the

display. Set the WAKE, LEAVE, RETURN

and SLEEP schedules for Sunday just as

you did for the weekdays and Saturday.

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for rate 1 is displayed (note the indicator on the

thermostat display as shown in Fig. 1). Use the

Warmer and Cooler keys to set the offset value.

Repeat the procedure for each rate. After you

have entered the last offset value, press the

Run Program key.

Time-of-Use Pricing, enter offset values for the

cooling season as you did for the heating

season.

Step 3—Set the System

and Fan Controls

After programming the thermostat, set the

system and fan controls as follows:

Entering a Cooling Schedule

Press the System key until the thermostat

displays the word COOL to indicate you are in

the cooling mode.

System Control

If you have a conventional heating/cooling

system, the system can be set to: HEAT, COOL

or OFF. If you have a heat pump system, the

system can be set to: HEAT, EM. HEAT, COOL

or OFF.

Enter cooling temperatures for the WAKE,

LEAVE, RETURN and SLEEP times by

following the same instructions as for Entering a

Heating Schedule above. If you subscribe to

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You can change the system setting by pressing

the System key. Each time you press the key,

the system status changes to the next setting.

schedule you programmed (heat pump in

cooling mode).

No status: Both the heating and air condition-

ing systems are off (heat pump off)

displayed.

The status of the system is as follows when the

associated indicator is displayed:

HEAT: The thermostat will control your

heating system according to the schedule

you programmed (heat pump in heating

mode).

Fan Control

There are two fan settings: AUTO and ON.

Set the fan at the setting you want by pressing the

Fan key. Each time you press the key, the fan

status changes to the next setting.

EM. HEAT: The thermostat will disable the

heat pump and control the emergency

heater element according to the schedule

you programmed.

COOL: The thermostat will control your air

conditioning system according to the

When FAN is displayed, the fan is on continu-

ously. Use this setting for improved air circulation

during special occasions or for more efficient

electronic air cleaning.

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When nothing is displayed, the fan is in AUTO

mode (it comes on with the heating or cooling

equipment, as needed). AUTO is the normal

setting for most homes and allows a single-

speed fan to turn on automatically with the air

conditioner or furnace. If you have a two-speed

fan, it usually runs on high with the air condi-

tioner and on low with the furnace.

OPERATING YOUR THERMOSTAT

Normally you want your thermostat to run

according to the program you entered; however,

you can also change your program to perform

the following operations.

NOTE: The system control must be set to

HEAT or COOL to perform the following

operations.

Step 4—Start the Thermostat Program

To start the thermostat using the program you

have just entered, press the Run Program key.

Temporarily Change Temperature Setting

for the Current Period Only

Press the Warmer or Cooler key until the

temperature you want is displayed. The tempo-

rary setting stays in effect only until the next

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scheduled program change. (If you subscribe to

Time-of-Use Pricing, it stays in effect only until

the next rate change.) To cancel the temperature

change, press the Run Program key. When a

temporary temperature is in effect, the display

alternates between the time/temperature and the

temporary setting.

Check the Current Temperature Setting

To check the current (programmed) temperature

setting, press the Present Setting key. Then

verify the setting you selected.

Check the Programs You Entered

Press the Weekday Schedule or Weekend

Schedule key. Each time you press the key, the

next program schedule is displayed. You can use

this feature to verify that you correctly entered

the program as shown in your Personal Pro-

gramming Charts.

Hold a Temperature Indefinitely

You could find this operation useful when you go

out of town on business or on vacation.

Press the HoldTemp key and then set the

temperature using the Warmer or Cooler keys.

This temperature stays in effect until you press

the Run Program key.

Cancel a Program

You can cancel a program by pressing the

Weekday Schedule or Weekend Schedule key

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until the program you want to cancel is dis-

played; then press the Clear key.

COOL, then press the Usage key. Each time you

press the Usage key, the thermostat displays the

next usage value. The HR and MIN segments

are lit and the display shows the numerical value

for each.

NOTE: You cannot cancel the WEEKDAY

WAKE program.

Check Usage

If you do not subscribe to Time-of-Use Pricing,

the thermostat displays current usage the first

time you press the Usage key and accumulated

usage the next time you press the Usage key.

This thermostat keeps a record of the current

and accumulated on-time of your heating and

cooling equipment. It tracks current day usage

(

since midnight) and accumulated usage (since

the accumulator was last cleared). If you

subscribe to Time-of-Use Pricing, the thermostat

records usage for each rate.

If you subscribe to Time-of-Use Pricing, there

are eight usage values that can be displayed.

The first time you press the Usage key, the

thermostat displays the current usage value for

rate 1. Each time you press the Usage key

again, usage values for rates 2, 3 and 4 ,

To view heating or cooling equipment usage,

press the System key to display HEAT or

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respectively,are then incrementally displayed. If

you continue to press the Usage key, accumu-

lated usage values are repeated for rates 1

through 4.

Permanently Change a Program

To permanently change a program, repeat the

appropriate steps in Programming Your Thermo-

stat.

Press the Run Program key to stop viewing

usage.

Return to Normal Program or Start Program

Any time you want to return to the normal

program or start the program, press the Run

Program key. If you temporarily changed the

temperature or you used the HoldTemp key,

pressing the Run Program key will cancel your

change.

Current day usage is automatically cleared at

midnight. To clear an accumulated value, press

the Usage key until the value you want to clear

is displayed and then press the Clear key. If you

subscribe to Time-of-Use Pricing, your utility can

also clear the accumulators by sending a

message to the thermostat.

Change Fan or System Control Settings

Change the fan setting by pressing the Fan key.

Each time you press the key, the fan status

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changes to the next setting. When FAN is

displayed, the fan is on continuously. When

nothing is displayed, the fan is in AUTO mode (it

comes on with the heating or cooling equipment,

as needed).

THERMOSTAT OPERATION

WHEN SPECIAL PROGRAMS

ARE IN EFFECT

Normally your thermostat operates as you

programmed it. If you subscribe to either of the

following special programs, there may be times

when it does not operate as you expect. Before

calling for service, read the following information.

Change the system setting by pressing the

System key. Each time you press the key, the

system status changes to the next setting.

Direct Load Control (DLC)

When the thermostat is operating under DLC,

the amount of time your heating/cooling system

can operate is controlled by radio signal from

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your utility company. If you notice the tempera-

ture in your home is higher or lower than the

setting you programmed into the thermostat,

check the thermostat display. To indicate the

equipment is under DLC, the thermostat displays

the word SAVING. You cannot control the

equipment comes on. You cannot override this

time delay.

Time-of-Use Pricing

If you subscribe to Time-of-Use Pricing, the

thermostat displays the rate in effect, see Fig. 1.

You cannot adjust which rate is in effect; you can

only adjust the temperature offset value for each

rate. Refer to Programming Your Thermostat

section for information on setting the offset value

for Time-of-Use Pricing. To notify you a rate

change will be occurring, the Time-of-Use

indicator on the thermostat begins blinking one-

half hour before the rate change takes effect.

heating/cooling equipment when it is under DLC.

When the utility releases your thermostat from

DLC, your heating or cooling equipment may not

be immediately available. To prevent damage to

your heating and cooling equipment and to allow

the utility to bring the equipment on-line effec-

tively of all homes that subscribe to DLC, your

thermostat automatically calculates and initiates

a time delay before the heating or cooling

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When a rate change message is received by the

thermostat, your heating/cooling system

automatically operates at the temperature and

offset value you programmed. You cannot

temporarily override the offset. If you need to

change the offset, refer to Programming Your

Thermostat.

REPLACING THE

THERMOSTAT BATTERIES

IMPORTANT

Batteries must be installed to maintain

the time and date in the event of a

power loss. Although the thermostat

has a low battery indicator, replace the

batteries once every two years to

prevent the thermostat from losing its

time/date information in the event of a

momentary power loss.

For additional information about either of these

programs, contact your utility company.

As the batteries run low, the display shows bAt

Lo. This low battery indication flashes for one to

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two months before the batteries run out com-

pletely. Replace the batteries as soon as

possible after the indicator starts flashing.

INSTALL TWO AA ALKALINE

BATTERIES AS SHOWN

You will need two AA alkaline batteries; non-

alkaline batteries will not last as long, and can

leak, causing damage to the thermostat or the

wall surface. We recommend Energizer®

batteries.

•

Use a coin to carefully remove the battery

door.

Press down on the left ends of the batteries

to remove them.

Install the fresh batteries as shown in Fig. 3.

Make sure positive and negative terminals

are oriented correctly.

M7905

Fig. 3. Battery replacement

•

Replace the battery door.

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TROUBLESHOOTING GUIDE

IF...

THEN…

Display will not come on.

•

There is no power applied to the thermostat. Check fuse or

circuit breaker.

Temperature display will not

go lower than 45°F or higher

than 88°F during programming.

•

You have reached the temperature setting limit. The setting

range is 45°F to 88°F.

Temperature change occurs

incorrectly.

•

Check the program times for the period in question. Be sure

that AM and PM indications are correct. Make sure the current

day and time are correct. Reprogram if necessary.

Remember that it takes time for the system to recover. Refer

to Recovery from Setback section.

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Heating will not come on.

Cooling will not come on.

•

Check that the system control on the thermostat is set to

HEAT.

Check the display. If SAVING is displayed, the system is in in

DLC mode and the thermostat is utility controlled. Heating

cannot come on until the DLC period ends.

If the temperature setting is higher than current temperature,

and the display says HEAT, contact your utility company.

•

Check that the system control on the thermostat is set to

COOL.

Check the system fuse or circuit breaker and replace or reset,

if necessary.

Check the display. If SAVING is displayed, the system is in

DLC mode and the thermostat is utility controlled. Cooling

cannot come on until the DLC period ends.

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Cooling will not come on. (cont.)

•

The thermostat has a built-in time delay on cooling. To prevent

equipment damage, allow five to ten minutes after changing

the setting before the air conditioner starts.

If temperature setting is lower than the current temperature,

and the display shows COOL, set the system control to the

OFF setting for ten minutes. After ten minutes, return the

system control to the COOL setting. If the air conditioner

comes on, the compressor may have reached its high limit

temperature protection and shut down. If the air conditioner

does not come on after ten minutes and the display shows

COOL, contact your utility.

The house is too warm or

too cool.

•

Press Present Setting key to check the current temperature

setting.

If desired, change the temperature setting. See Operating

Your Thermostat section.

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The house is too warm or

too cool. (cont.)

•

If you subscribe to Real-time Pricing, you may need to adjust

your offset values to provide a more comfortable temperature.

Check the display. If SAVING is displayed, the system is in

DLC mode and your thermostat is utility controlled. Cooling or

heating cannot come on until the DLC period ends.

System ON indicator is lit,

but no heat is coming from

the registers.

•

Allow time for the furnace or heat pump to heat up and the

fan to come on before checking for heat at the register.

The thermostat’s current

setting does not match

the display temperature.

•

Be aware that it is normal for the current setting and

display temperature to differ occasionally.

During recovery from setback or setup, setting and display

temperatures may differ to within ±1° for up to 30 minutes

after the recovery period.

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Incorrect room temperature

showing on thermostat display.

Thermostat is flashing

•

The thermostat is factory-calibrated, and cannot be adjusted.

You are a subscriber to one of the special pricing programs

and your thermostat has lost communication with the utility

company. Call the number displayed on the thermostat or the

number on the thermostat label for information.

CALL <xxx-xxxx>.

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TOLL-FREE CUSTOMER ASSISTANCE

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

assistance is needed, call your utility’s Customer Assistance number.

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

date code, type of heating/cooling system (hot water, warm air, oil, gas, heat pump, etc).

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WARRANTY CONDITIONS.C.WARRANTY CONDITIONS;

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 Honeywell’s 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.

Return Goods Department

050 Berkshire Lane

Plymouth, MN 55441-4437

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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.

Honeywell’s 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.

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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 Assistance Center,

Honeywell Inc., P.O. Box 524, Minneapolis, MN 55440-0524. In Canada, write Retail Products

ON15-02H, Honeywell Limited/Honeywell Limitée, 155 Gordon Baker Road, North York, Ontario

M2H 2C9.

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Home and Building Control

Honeywell Inc.

Home and Building Control

Honeywell Limited-Honeywell Limitée

155 Gordon Baker Road

North York, Ontario

Honeywell Plaza

Printed in U.S.A. on recycled

paper containing at least 10%

post-consumer paper fibers.

P.O. Box 524

Minneapolis, MN 55408-0524

M2H 3N7

69-1153 R.L. 9-97

www.honeywell.com/yourhome

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