Honeywell EnergyPro T8665C User manual

69-1538
OWNER’S GUIDE
® U.S. Registered Trademark
Copyright © 2003 Honeywell International Inc.
All Rights Reserved
T8665C,D,E EnergyPro™ Thermostat

69-1538 2
Contents
Introduction .................................................................................................................................... 3
Using this Guide ............................................................................................................................ 4
Thermostat Features ..................................................................................................................... 7
Operating Your Thermostat ........................................................................................................... 11
Setting the Clock ........................................................................................................................... 12
Programming Your Thermostat ..................................................................................................... 25
Replacing the Batteries (T8665C Only) ......................................................................................... 38
Adaptive Intelligent Recovery™ Control ........................................................................................ 40
Troubleshooting (Table 3) .............................................................................................................. 43
Warranty ........................................................................................................................................ 50
Customer Assistance .................................................................................................................... 51

3 69-1538
INTRODUCTION
Congratulations on purchasing your new
EnergyPro™ Thermostat. This exciting new
product is designed to add a new level of
service, energy savings and convenience to
your home comfort system. As part of a larger
system of products and services from your
Energy Utility, your new thermostat allows you
to take advantage of special programs offered
through your Energy Utility. These programs
allow you to further increase your energy
savings beyond the efficiency of a traditional
programmable thermostat.
Although the EnergyPro™ Thermostat can be
used standalone, it is intended to be part of a
communicating system provided by your
Energy Utility.
Read this document thoroughly to take
advantage of the convenience and energy
saving benefits of using this product.

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USING THIS GUIDE
The T8665C,D,E Communicating Thermostat
uses two-way radio frequency (RF) to send and
receive information. This information can be
used to make changes to your thermostat
settings, or settings from your Energy Utility.
The following symbols will help you identify the
features that apply to your system:
—–Tip symbol. Look for helpful
tips throughout this guide
when you see this symbol.
— – Compressor with the word,
Heat Pump, below.These
features are availble when
used with a heat pump.
Keyboard and Display Description
Keyboard
The keyboard is located behind the thermostat
cover. Three frequently used keys: increase ,
decrease , and ikey are located next to the
display. See Fig. 1.
Display
The thermostat displays important information
such as day, time, schedule period,
temperature, filter information, system and fan
operation. See Fig. 2.
WARNING: This product operates under
provisions of Part 15 of the FCC Rules.
Modifications to this product not specifically
authorized by Honeywell may void the user’s
authority to operate this device.
80
90
70
60
90
80
70
60
H
EAT PUMP

5 69-1538
Fig. 1. Thermostat keyboard description.
M20893
A
Time Set Program
Run
Program
Hold Temp
Set Current
Day/Time
Day Heat/Cool
Settings
Wake
Fan
System
Copy
Daylight
Time
Leave Return Sleep
INCREASE
RAISES TEMPERATURE SETTING
DECREASE
LOWERS TEMPERATURE SETTING
INFORMATION
DISPLAYS CURRENT HEAT/COOL
TEMPERATURE SETTING, FILYER
STATUS, AND OUTDOOR
TEMPERATURE (WHEN INSTALLED)
.
PROGRAM SCHEDULING
WAKE LEAVE RETURN SLEEP
ENTERS PROGRAMMING MODE
FAN
SELECTS AUTO/ON
SYSTEM
SELECTS HEAT/OFF/COOL (AUTO)
DIGITAL
DISPLAY
S
ET CURRENT DAY/TIME
S
ETS CURRENT
D
AY AND TIME
R
UN PROGRAM
R
ETURNS THERMOSTAT TO
N
ORMAL OPERATING MODE.
P
RESS AND HOLD TO CANCEL
E
NERGY SAVINGS AND
P
RE-HEAT/PRE-COOL MODES
(
MY CHOICE).
HEAT/COOL SETTINGS
SWITCHES BETWEEN HEAT SETPOINTS AND
COOL SETPOINTS WHILE PROGRAMMING
T
IME / TIME
SETS TIME
FORWARD OR BACK
H
OLD TEMP
S
ETS A HOLD TEMPERATURE
S
ETTING AND ACTIVATES
V
ACATION HOLD FEATURE
DAYLIGHT TIME
SELECTS STANDARD TIME
OR DAYLIGHT SAVING TIME
COPY
COPIES SETTINGS FROM ONE DAY TO
ANOTHER DAY FOR QUICKPROGRAMMING
Filter
FILTER
SELECTS FILTER TIMER REMINDER
PERIOD (0, 15, 30, 60, 90, 120 DAYS)
D
AY
S
ETS DAY OF THE WEEK
WAKE
SET WAKE TIMES
AND
TEMPERATURES
LEAVE
SET LEAVE TIMES
AND
TEMPERATURES
RETURN
SET RETURN TIMES
AND
TEMPERATURES
SLEEP
SET SLEEP TIMES
AND
TEMPERATURES

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Fig. 2. Example of thermostat display.
Auto
System
Fan
Off Wait
Wake
Mon
AM
Filter Days On
DST
TueWedThuFriSat Sun Repl Batt Room
Leave ReturnSleep Recovery
Set Program Set Day/Time
Em Ht Aux Ht
HiMedLo
Critical
Hold for
Temporary
Setting
Em
Heat
M20894
DISPLAYS
EITHER CURRENT
TIME OF DAY OR
PROGRAM TIMES
SHOWS
THERMOSTAT
IS IN THE
SET CURRENT
DAY/TIME MODE
SHOWS
TEMPERATURE
SETTING CHANGED
FOR THIS
PROGRAM
PERIOD
SHOWS TEMPERATURE
DISPLAYED IS THE CURREN
T
SET TEMPERATURE
SHOWS TEMPERATURE
DISPLAYED IS THE CURRENT
ROOM TEMPERATURE
S
HOWS FILTER TIMER
E
XPIRED (TIME TO
R
EPLACE FILTER)
DISPLAYS EITHER ROOM
OR SET TEMPERATURE
SHOWS CURRENT FAN
KEY POSITION ON/AUTO
SHOWS THERMOSTAT IS
CALLING FOR THE FAN
SHOWS SMART
RESPONSE IS OFF
AND CONVENTIONAL
RECOVERY IS ON
SHOWS THAT THERMOSTAT
IS CALLING FOR
SHOWS CURRENT
SYSTEM KEY POSITION
HEAT/OFF/COOL
S
HOWS CURRENT
P
ROGRAM PERIOD
O
R PERIOD BEING
P
ROGRAMMED
S
HOWS CURRENT
D
AY OR DAYS BEING
P
ROGRAMMED
SHOWS WHEN
THERMOSTAT
IS IN THE
PROGRAMMING
MODE
S
HOWS VACATION
H
OLD DURATION
SHOWS SYSTEM ON
DAYLIGHT SAVING TIME
SHOWS ADAPTIVE
INTELLIGENT RECOVERYTM
IS IN EFFECT
SHOWS BATTERIES
NEED REPLACING
SHOWS THERMOSTAT
IS COMMUNICATING
SUCCESSFULLY
SHOWS CRITICAL
PRICE TIER IS ACTIVE
SHOWS ACTIVE
PRICE TIER
(HIGH, MEDIUM OR LOW)

7 69-1538
THERMOSTAT FEATURES
• Adaptive Intelligent Recovery™ Control
for comfort and energy savings.
• Customize the program schedule—
program your own schedule to fit your
needs.
• Temporary schedule override—set the
thermostat higher or lower for the current
program schedule.
• Permanent schedule override—set the
thermostat higher or lower indefinitely.
• Vacation mode (1 to 255 days) for added
comfort and energy savings. Set the
temperature higher or lower for energy
savings while on vacation. At the same
time, set the comfort level you want when
you return.
• Set the filter indicator (0, 15, 30, 60, 90, or
120 days) to remind you to change the
filter.
• Information at the press of a button—use
the i (information) key to see the outdoor
temperature (C7089B Outdoor Temper-
ature Sensor optional accessory), the
current setpoints, or the filter status.
• Daylight Time key for quick time changes
between Daylight and Standard time.
• Backlit display for improved readability
(press any key to activate).
• Optional outdoor temperature display—
ask your installer to install an outdoor
temperature sensor to activate this
feature.
• For additional features, see the System
User’s Guide provided by your Energy
Utility or systems provider.

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Special Energy Saving Features
The EnergyPro™ Thermostat supports
Demand Response and Price Response
Programs from your Energy Utility. If you have
any questions concerning the application of this
thermostat or these special programs and
features, please contact your local Energy
Utility.
Demand Response
If your utility offers a Demand Response
Program, this thermostat can be managed by
your utility to reduce your energy consumption
during times of peak demand. When your
thermostat is helping your Energy Utility to
manage energy in your community, the word,
SAVE, is displayed on the thermostat as shown.
If you have any questions about the application
of this thermostat or these special programs
and features, please contact your local Energy
Utility.
Aut
o
System
Fan
Wake DST
Cool
Sat Room
Set Program Set Day/Time
Em Ht Aux Ht
M20901

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Pre-Cool and Pre-Heat
Your Energy Utility may decide to use the
Pre-cool /Pre-heat feature to slightly raise or
lower your home temperature setting
immediately prior to a Demand Response
event to minimize the effect on your comfort.
When the Pre-heat or Pre-cool option is in
effect, the thermostat displays PrE.
Price Response
If your utility offers a Price Response Program,
this thermostat works with your Energy Utility to
inform you of the rate in effect at any given time
and automatically adjust your energy use for
each rate. The rate in effect is indicated on the
thermostat display as shown (Critical, Hi, Med,
and Lo). This typically involves controlling your
home at a higher temperature during cooling
season and a lower temperature during heating
season to reduce energy consumption.
Aut
o
System
Fan
Wake DST
Cool
Tue Room
Set Program Set Day/Time
Em Ht Aux Ht
M20902

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Display shows Critical rate in effect.
Display shows High rate in effect.
Display shows Medium rate in effect.
Display shows Low rate in effect.
Aut
o
System
Fan
Wake
AM
DST
Cool
Tue Room
Set Program Set Day/Time
Em Ht Aux Ht
Critical
M20906
Aut
o
System
Fan
Wake
AM
DST
Cool
Tue Room
Set Program Set Day/Time
Em Ht Aux Ht
Hi
M20903
Aut
o
System
Fan
Wake
AM
DST
Cool
Tue Room
Set Program Set Day/Time
Em Ht Aux Ht
Med
M20904
Aut
o
System
Fan
Wake
AM
DST
Cool
Tue Room
Set Program Set Day/Time
Em Ht Aux Ht
Lo
M20905

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My Choice
There may be times when you need to cancel
an energy-saving event such as Demand
Response, Pre-heat or Pre-cool. Your Energy
Utility may offer a program that incorporates the
My Choice feature. To use My Choice and
cancel an energy-saving event, press and hold
Run Program key for three seconds until the
thermostat displays Done.
If the utility does not offer the My Choice
feature, pressing and holding the Run Program
key will not cancel the energy-saving event.
Call your Energy Utility provider for
further information.
OPERATING YOUR
THERMOSTAT
Your new thermostat saves energy and keeps
you comfortable at the same time. You may be
wondering how to program your thermostat and
how to use some more time and energy-saving
features. First, let’s look at features you’ll be
using often, like setting the System and Fan
keys, how to override the current programming
mode or to hold the thermostat at a specific
temperature while you go on vacation. You can
M1459
6
Run
Program

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even program the thermostat to return to your
regular programming schedule on your last day
of vacation so you are comfortable when you
return and yet save energy while you are away.
SETTING THE CLOCK
Setting Current Day and Time
IMPORTANT
Always press keys with your fingertip
or similar blunt tool. Sharp instruments
like pens and pencil points can
damage keyboard.
On initial powerup or after an extended power
loss, “1:00 PM” flashes on display until a key is
pressed.
1. Press Set Current Day/Time key.
Press Set Current Day/Time key to show information
displayed.
Setting the clock can be controlled as part of
the system using two-way
RF communication; then
the time is automatically
updated.
2. Press Day key until current
day displays.
M1458
0
Mon
PM
80
90
70
60
90
80
70
60
Day

13 69-1538
Mon = Monday, Tue = Tuesday,
Wed = Wednesday,
Thu = Thursday,
Fri = Friday, Sat = Saturday,
Sun = Sunday.
Press Day key to set current day. Example display
shows Tuesday.
3. Press Time ∆or
Time ∇key until
current time displays.
Tap Set Current Day/Time key to
advance time in
one-hour
increments.
4. Press Run Program key to
return to normal operation.
Press Time ∆or Time ∇ key to set current time.
Example display shows 8:15 AM.
M1458
1
PM
M1458
2
AM
80
90
70
60
90
80
70
60
80
90
70
60
90
80
70
60
Run
Program

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Daylight Saving Time
NOTE: If current time is Daylight Saving Time,
press Daylight Time key to display
“DST.”
Press Daylight Time key to set Daylight Saving Time.
Pressing Daylight Tiime key more than once in
a five-minute period scrolls
you through various time
options (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.
Setting System and Fan Keys
Use the System and Fan keys to change the
system and fan settings. The fan settings can
be set for each schedule period individually.
System selection is for all schedule periods.
M1458
3
AM
80
90
70
60
90
80
70
60
Daylight
Time

15 69-1538
CAUTION
Equipment Damage Hazard.
Can cause permanent damage to the
compressor or other equipment.
To avoid possible compressor damage,
allow compressor to remain off for five
minutes before restarting.
To avoid possible equipment damage,
do not operate cooling when outside
temperature is below 50°F (10°C). See
equipment manufacturer instructions.
Setting System Key
Press the System key until the
desired system (Heat, Off, Cool,
or Auto) displays.
Heat: The thermostat controls the heating.
Off: Both the heating and cooling are off.
Cool: The thermostat controls the cooling.
Auto: The thermostat automatically changes
between heating and cooling operation,
depending on the indoor temperature.
Em.Ht: Emergency heat is controlled as stage 1
heat. The Cooling system is
off. The compressor is de-
energized.
H
EAT PUMP
System

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Setting Fan Key
Press Fan key until desired mode
(On or Auto) displays:
On: Fan operates continuously.
Auto: Fan operates only when heating
or cooling.
Setting Temporary Temperatures
You can override the current schedule period to
temporarily change the temperature setting
until the next schedule period, or you can
change and hold the temperature setting
indefinitely. You can also change the
temperature setting until a designated day and
period (for example, while you are on vacation).
Changing Temperature to Temporary
Setting Until Next Schedule Period
Press increase or decrease  key until the
desired temperature setpoint displays.
While selecting a temporary setting, only the setpoint
displays.
The temporary temperature setting you select
displays for approximately three seconds. The
display reads “Temporary” until the next period
begins or when you cancel the temporary
temperature setting.
M1456
3
Temporary Setting
Fan

17 69-1538
Press the Run Program key to
cancel the temporary temperature
setting before the designated time.
After selecting a temporary setting, the display reads
“Temporary” until cancelled. Example display shows
temporary heat setting of 70° at 6:00 AM.
If or appears under temperature display,
both heating and cooling
setpoints are being
adjusted. Tapping or 
key changes both heat and
cool setpoints one degree.
(Press i key after setpoint is
reached to verify setpoints.)
Changing and Holding Temperature
Setting Indefinitely
1. Press Hold Temp key once.
2. Press increase or decrease key to
change temperature setpoint, if desired.
M1456
4
Mon
System
Fan
Hea
t
Auto
AM
Heat
Temporary
80
90
70
60
90
80
70
60
Run
Program
Hold Temp

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NOTE: The Display changes from setpoint to
room temperature after approximately
three seconds.
3. Press Run Program key to
cancel hold.
Press Hold Temp key once to display the thermostat
in Hold mode. Example display shows temporary
heat setting of 60°.
Changing Temperature Setting Until a
Designated Day and Period (Vacation
Hold)
1. Press Hold Temp key twice.
Press Hold Temp key twice to display thermostat in
Vacation mode. Example display shows temporary
heat setting of 60°.
M1456
5
System
Fan
Hea
t
Auto
Heat
Setting
M1483
3
Wake
System
Fan
Hea
t
Auto
Hold for
Heat
Days
Setting
Hold Temp Hold Temp

19 69-1538
IMPORTANT
To cancel Vacation Hold before desig-
nated time, press Run Program key.
2. Press Time ∆or Time ∇
until desired number of
days (1 to 255 days)
displays.
Press Time ∆or Time ∇key to select number of
vacation days. Example display shows 18 vacation
days.
3. Press Wake, Leave, Return or Sleep key
to select the period the Hold ends.
In this example, the Hold ends after the 18th day at the
beginning of the Return period.
4. Press increase or decrease to
adjust temperature setting, if desired.
M1483
4
Wake
System
Fan
Heat
Auto
Hold for
Heat
Days
Setting
M1457
1
System
Fan
Heat
Auto
Wake Leave Return Sleep

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NOTE: Only the heating temperature is used
when System is set to Heat. Similarly,
only the cooling temperature is used
when System is set to Cool. The
thermostat uses both heating and
cooling temperatures when System is
set to Auto.
Press increase or decrease key to select a new
Hold temperature. Example display shows temporary
heat setting of 55°.
5. Press Heat/Cool Settings key
to change between heat and
cool settings.
6. Press increase or decrease to
adjust temperature setting, if desired (for
example, if cool is set to 84°, cooling
equipment operates when room
temperature is above 84°F).
7. Press Run Program to start
over or return display to
normal.
M1457
2
System
Fan
Heat
Auto
Heat/Cool
Settings
Run
Program